How do the properties of the p block metals compare with those of the metals in the s and d blocks?
Final answer:
p-block metals have higher electronegativities and ionization energies compared to the reactive s-block metals. d-block metals, known as transition metals, posses variable oxidation states and form colorful compounds, setting them apart from p-block and s-block elements.
Explanation:
The properties of p-block metals differ considerably compared to those in the s-block and d-block. One of the most distinguishing features of p-block metals is their position on the periodic table - they are found in the right-most six columns. Elements in the p-block, which include both metals and nonmetals, typically have higher electronegativities and ionization energies than s-block elements, which consists mostly of metals with low electronegativities like the alkali and alkaline earth metals.
d-block elements, also known as transition metals, have a much larger range of oxidation states and, due to incomplete inner d subshells, typically exhibit properties like colorful compounds, variable oxidation states, and often function as good catalysts. Electronegativity and electron affinity generally increase from left to right across the periodic table, affecting the chemical properties of these elements.
s-block elements tend to be softer and more reactive due to their single valence electron (alkali metals) or two valence electrons (alkaline earth metals). They usually have lower melting and boiling points compared to most d-block metals. The d-block elements are characterized by their partially filled d-orbitals which allow them to form a variety of complex ions and colored compounds.
A certain ion has a charge of 2+ and 27 electrons. which ion is it
The ion with a charge of 2+ and 27 electrons is a copper ion (Cu²+), which has lost two electrons to acquire the positive charge.
Explanation:The ion the question is asking about is an ion that has lost two electrons and therefore has a charge of 2+. The ion has 27 electrons, but it would normally have 29 electrons (27 + 2). This means the ion is a cation from which two electrons have been removed. To find which element it is, we should look for an element in the periodic table with the atomic number of 29. That element is copper (Cu). Therefore, the ion is a copper ion, specifically Cu²+, as it has lost two electrons and carries a positive charge.
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How does alpha decay affect the mass number of a nucleus how does beta decay affect the mass number?
Final answer:
Alpha decay decreases a nucleus's mass number by four and the atomic number by two, while beta decay does not change the mass number but increases the atomic number by one.
Explanation:
The process of alpha decay affects the mass number of a nucleus by decreasing it.
When a nucleus undergoes alpha decay, it emits an alpha particle, which consists of two protons and two neutrons. This results in the mass number decreasing by four and the atomic number decreasing by two.
For instance, in the alpha decay of uranium-238 to thorium-234, we see a decrease from 238 to 234 in the atomic mass and from 92 to 90 in the atomic number.
In contrast, beta decay does not change the mass number of the nucleus, as it involves the transformation of a neutron into a proton, electron, and neutrino.
The mass number remains constant because a neutron is simply converted into a proton, while the atomic number increases by one due to the additional proton.
For example, when carbon-14 undergoes beta decay to form nitrogen-14, the mass number stays at 14, but the atomic number increases from 6 (carbon) to 7 (nitrogen).
What are group 6a elements likely to do when they form ions-gain electrons or lose them?what are group 6a elements likely to do when they form ions-gain electrons or lose them?lose electronsgain electrons?
Which is the processes is not an example of chemical weathering?
A) splitting of a rock along a fracture
B) rusting of a nail
C) dissoulution of calcite (fizzling)
D) a rock that has oxidized on the surface
Answer: correct answer is A
Explanation: i took the test
Describe several products of photosynthesis important to humans
Find the concentration of chloride ions in a solution that is 0.110 m in sodium chloride (nacl) and 0.11 m in magnesium chloride (mgcl2).
The concentration of Chloride ions in the solution of NaCl and Magnesium chloride has been 0.165 M.
The dissociation of the compound in the solution has been resulted in the formation of the constituent ions.
The concentration of the ions in the sample has been determined by the stoichiometric coefficient of the balanced equation.
Computation for concentration of Chloride ionsThe concentration of Cl ions from sodium chloride solution has been given by:[tex]\rm NaCl\;\rightarrow\;Na^+\;+\;Cl^-[/tex]
The concentration of Cl ions has been:
[tex]\rm 1\;M\;NaCl=1\;M\;Cl^-\\ 0.11\;M\;NaCl= 0.11\;M\;Cl^-[/tex]
The Cl ions from NaCl has been 0.11 M.
The Cl ions from magnesium chloride have been given as:[tex]\rm MgCl_2\;\rightarrow\;Mg^2^+\;+\;2\;Cl^-[/tex]
The concentration of Cl ions has been:
[tex]\rm 1\;M\;NaCl=0.5\;M\;Cl^-\\ 0.11\;M\;NaCl= 0.11\;\times\;0.5\;M\;Cl^-\\0.11\;M\;NaCl=0.055\;M\;Cl^-[/tex]
The Cl ions from Magnesium chloride have been 0.055 M.
The total concentration of Cl ion has been:[tex]\rm Cl^-=NaCl\;+\;MgCl_2\\Cl^-=0.11\;+\;0.055\;M\\Cl^-=0.165\;M[/tex]
The concentration of Chloride ions in the solution of NaCl and Magnesium chloride has been 0.165 M.
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Which is the correct electron configuration for sodium (Na)?
A. 1s22s22p62d1
B. 1s22s22p63s1
C. 1s22p63d3
Answer: [tex]1s^22s^22p^63s^1[/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The electrons are filled according to Afbau's rule in order of increasing energies.
Total number of electrons of sodium are 11 as the atomic number of sodium is 11. The electronic configuration of sodium will be represented as:
[tex][Na]:11:1s^22s^22p^63s^1[/tex]
The number of electrons in an ion with 16 protons and an ionic charge of 2- is ________.
In a given neutral atom, actually the number of protons and electrons are equal. So ideally in this case the number of electrons should also be 16. However we have an ionic charge of negative 2. Since it is negative, this means there are 2 more electrons than protons, hence the answer is:
18 electrons
The process by which a radioactive isotope loses protons or other materials from its nucleus is called
Please help with 3 and 4
Sodium is a metal m, like copper. Suggest reasons why sodium cannot be used in electrical wires.
Sodium cannot be used in electrical wires due to its high reactivity and lower electrical conductivity compared to metals like copper.
Additionally, sodium is too soft and unsafe for wiring purposes.
Copper is preferred for its high conductivity and ability to be made into wires.Sodium is a metal, just like copper, but it cannot be used in electrical wires for several reasons. First, sodium is highly reactive and must be stored out of contact with air because it reacts violently with oxygen and water, which makes it unsafe for use in electrical wiring. Second, while metals like copper are excellent electrical conductors due to their high conductivity, sodium does not possess the same level of conductivity. Additionally, sodium's physical properties, such as its softness, make it unsuitable for being stretched into thin wires required for electrical applications.Copper is preferred because it has high electrical conductivity, resistance to corrosion, and can be easily drawn into wires.
A gas has a volume of 5.0 L at a pressure of 50 kPa. What happens to the volume when temperature is held constant and the pressure is increased to 125 kPa?
Answer:
Volume will be 2L
Explanation:
The problem can be solved taking into account Boyle-Mariotte Law for ideal gases
. It states:
At constant temperature, the volume of a fixed mass of gas is inversely proportional to the pressure it exerts.
[tex]P_{1} *V_{1} =P_{2} *V_{2}\\[/tex]
Being P1 and V1 the values of Pressure an temperature in the gas initial state. And P2, V2, pressure and temperature of the gas in the final state.
The given values are:
V1=5LP1=50kPaP2=125kPaV2=?So, we replace given values in the formula isolating V2:
[tex]\frac{P_{1} *V_{1}}{P_{2} } =V_{2}\\\\\frac{50kPa *5L}{125kPa}=V_{2}\\\\V_{2}=2L[/tex]
So, the volume when pressure is increased to 125 kPa will be 2L.
Give the reaction for the dissolution of the salt in water. (use the lowest possible coefficients. include states-of-matter under the given conditions in your answer.)
Dissolution of salts in water is represented by a chemical reaction in which the salt splits into its individual ions. The process is spontaneous and often exothermic. Factors like the solvent characteristics, temperature, pressure, and specific interactions affect solubility.
Explanation:When a salt such as NaCl is dissolved in water, it splits up into its individual ions, which become solvated or surrounded by water molecules. This process can be described by the chemical equation: NaCl(s) → Na+(aq) + Cl-(aq). Also, for another salt like Fe(NO3)3, the dissolution process can be represented as: Fe(NO3)3(s) →→ Fe³+(aq) + 3NO3¯(aq). The s, aq annotations represent the states of matter, solid and aqueous, respectively.
The dissolution of these salts in water is a physical process that increases the disorder of the system, hence a spontaneous process, often exothermic. The solubility of salts is greatly influenced by the nature of the solvent, temperature, and pressure. SIP (Solubility, Ionization, and Precipitation) principles along with factors like dipole-dipole attractions, hydrogen bonds, ion-dipole, and dispersion forces play an important role in solubility.
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The reaction for the dissolution of salt in water is NaCl (s) + H2O (l) → Na+(aq) + Cl-(aq)
Explanation:The reaction for the dissolution of salt in water can be represented by the following equation:
NaCl (s) + H2O (l) → Na+(aq) + Cl-(aq)
In this reaction, the solid salt (NaCl) dissociates into its constituent ions (Na+ and Cl-) when it is dissolved in water.
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Water has a density of 1.0 g/ml. which of these objects will float in water? object i: mass = 50.0 g; volume = 40.2 ml object ii: mass = 59.3 g; volume = 62.5 ml object iii: mass = 100.0 g; volume = 50.0 ml
Density is the ratio of mass and volume. Object II will float in water as it has a density of 0.95 g/ml.
What is density?Density is the measuring capacity that concerns the mass and the volume occupied by the object. It is calculated as:
Density (D) = Mass (M) / Volume (V)
For object I density is calculated as:
50. 0 / 40.2 = 1.24 g/ml
For object II D is calculated as:
59.3/62.5 = 0.9488 g/ml
For object III D is calculated as:
100 / 50 = 2 g/ml
Therefore, object II will float on water as it has less density than water.
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The emission of electromagnetic radiation by an excited atom is best explained by
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the emission of electromagnetic radiation by an excited atom is best explained by photoelectronic effect.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
The emission of electromagnetic radiation by an excited atom is best explained by photoelectronic effect.
Therefore, the emission of electromagnetic radiation by an excited atom is best explained by photoelectronic effect.
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What would be the formula of the compound iron (III) phosphide? Fe2P3 Fe3P FeP3 FeP
Answer : The correct formula of the given compound will be, [tex]FeP[/tex]
Explanation :
Iron (III) phosphide is an ionic compound because iron element is a metal and phosphorous element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.
The nomenclature of ionic compounds is given by:
1. Positive ion is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
3. In case of transition metals, the oxidation state are written in roman numerals in bracket in-front of positive ions.
The charge on iron is (+3) and the the charge on phosphide is (-3). The charges are balanced.
Hence, the formula of the compound iron (III) phosphide will be [tex]FeP[/tex]
What is the mass of a 300 ml sample of gaseous hydrogen chloride at 2.0 atm and 30c?
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Ideal gas is a hypothetical gas. Vanderwaal gas can behave as ideal gas at low pressure and high temperature. Therefore, the mass of a 300 ml sample of gaseous hydrogen chloride at 2.0 atm and 30°C is 0.00868g.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 L.atm/K.mol
substituting all the given values in the above equation
(2 )(0.3 ) = n(8.314 )(303)
0.6 = n(2519.142)
n = 0.00023818 mols of HCl
mass of HCl= 0.00023818 mols of HCl ×36.46g of HCl/ 1 mol of HCl
mass of HCl = 0.00868g
Therefore, the mass of a 300 ml sample of gaseous hydrogen chloride at 2.0 atm and 30°C is 0.00868g.
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Final answer:
To find the mass of a 300 ml sample of gaseous hydrogen chloride at 2.0 atm and 30°C, use the Ideal Gas Law to determine the number of moles, then multiply by the molar mass of HCl. The approximate mass is 0.89 grams.
Explanation:
To calculate the mass of a 300 ml sample of gaseous hydrogen chloride at 2.0 atm and 30°C, we can use the Ideal Gas Law, which is PV = nRT. In this case, we need to rearrange the equation to solve for n (the number of moles), then convert moles to mass using the molar mass of HCl.
First, convert the volume from milliliters to liters: 300 ml = 0.300 L.
Next, since the temperature is given in degrees Celsius, convert it to Kelvin: T(K) = 30°C + 273.15 = 303.15 K.
The Ideal Gas Law in terms of n is n = PV / RT. Here, P is the pressure in atm (2.0 atm), V is the volume in liters (0.300 L), R is the ideal gas constant (0.0821 L·atm/K·mol), and T is the temperature in Kelvin (303.15 K).
Substituting the values:
n = (2.0 atm * 0.300 L) / (0.0821 L·atm/K·mol * 303.15 K)n ≈ 0.0244 moles (rounded to the correct number of significant figures)Finally, we find the mass by multiplying the number of moles by the molar mass of HCl, which is approximately 36.46 g/mol.
Mass = n * molar mass of HCl = 0.0244 moles * 36.46 g/mol ≈ 0.89 g (rounded to two significant figures)
The mass of the 300 ml sample of gaseous hydrogen chloride at 2.0 atm and 30°C is approximately 0.89 grams.
The vapor pressure of ethanol at its normal boiling point would be
What are the isotopes? how all of the isotopes of an atom are similar and how are they different?
How many valence electrons does boron need to be stable?
A 20.0 g sample of a compound of nitrogen and oxygen contains 7.37 g of nitrogen. what is the formula of this compound?
Balance the equation for the formation of ammonia from hydrogen gas and nitrogen gas using a set of the lowest possible integer coefficients. what is the coefficient in front of ammonia, nh3, in the balanced equation? n2 (g) + h2 (g) → nh3 (g)
Answer:
The balanced equation is
[tex]N_{2}[/tex] (g) + 3 [tex]H_{2}[/tex](g) ⇒ 2 [tex]NH_{3}[/tex] (g)
The coefficient in front of ammonia, [tex]NH_{3}[/tex], in the balanced equation is 2.
Explanation:
The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.
Then, you must balance the chemical equation. For that, you must first look at the subscripts next to each atom to find the number of atoms in the equation. If the same atom appears in more than one molecule, you must add its amounts
Left side: 2 nitrogen and 2 hydrogen. Right side: 1 nitrogen and 3 hydrogen.The coefficients located in front of each molecule indicate the amount of each molecule for the reaction. This coefficient can be modified to balance the equation, just as you should never alter the subscripts.
In this case you can start balancing the hydrogen. On the left side there is an amount of two hydrogens, while on the right side there are three. In order to match the amount of hydrogen on both sides, the easiest way to do this is by exchanging these numbers and adding them as coefficients in front of each molecule. It is as follows:
[tex]N_{2}[/tex] (g) + 3 [tex]H_{2}[/tex](g) ⇒ 2 [tex]NH_{3}[/tex] (g)
By multiplying the coefficient mentioned by the subscript, you get the amount of each element present in the reaction. So now you can calculate again the amount of elements on each side of the chemical reaction:
Left side: 2 nitrogen and 6 hydrogen. Right side: 2 nitrogen and 6 hydrogen.You can see that you have the same amount of each element on each side of the chemical equation. This indicates that the equation is balanced.
And the coefficient in front of ammonia, [tex]NH_{3}[/tex], in the balanced equation is 2.
What would be the best technique to separate an insoluble solid from a liquid, like sand from water?
Answer:
FILTRATION
Explanation:
This is a very simple process with a very simple solution
What causes an ionic bond?a. two ions share electrons.b. two atoms share electrons.c. a positive ion is attracted to a negative ion.d. a positive ion is attracted to a positive ion?
Answer:
option C= A positive ion is attracted to negative ion
Explanation:
Ionic bond:
Ionic bond is formed when oppositely charged ions attract each others i.e negative and positive ions.
we know that a neutral atom consist of equal number of proton and electron, cancel the charge of each other that is equal in magnitude and make the atom neutral or we can say that net charge is zero.
But when the atom lose or gain the electron, imbalance of neutron electron occur so charge will not remain zero and atom is no more to be said neutral.
For example:
Take the example of sodium that can lose one electron and form Na+. This Na+ ion is called cation because it carry positive charge by losing the one electron. This cation now contain eleven proton and ten electron.
Now consider the example of Chlorine atom. It consist of 17 proton and 17 electron. But in order to attain the noble gas configuration or to complete the octet it gain one electron and form anion (Cl-). The chlorine anion consist of 17 proton and 18 electron.
Now consider the sodium chloride which is an ionic compound. It is formed by the complete transfer of electron from sodium to chlorine atom and form ionic bond. In this ionic compound sodium carry positive charge and chlorine carry negative charge there is attraction between these oppositely charged atoms.
After two or more atoms lose or receive electrons to create an ion, an ionic bond may develop. Metals that are losing electrons and nonmetals that are gaining electrons form ionic bonds. A positive ion is attracted to a negative ion in an ionic bond. The correct option is C.
Valence electrons are transported from one atom to another to form an ionic connection, which is then held together by electrostatic attraction. Metals and nonmetals can ionize one another. The negatively charged subatomic particles known as electrons are found in every atom.
Atoms exchange electrons during ionic bonding. At least one electron acceptor and one electron donor are required for ionic bonding.
Thus the correct option is C.
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What was inadequate about rutherford's model of the atom?
Rutherford proposed the nuclear model of atom where electrons are revolving the nucleus. However he was unable to determine the energy levels and momentum of electrons.
What is nuclear model of atom?There are various atomic models regarding the structure of atoms and its electronic properties. The predictions starts from Dalton's model of indivisibility of atoms. Later modified by many scientists Thomson, Rutherford, Bohr etc.
Rutherford conducted the gold foil experiment and he reached the result that the atoms are made of a nucleus and electrons where the nucleus contains positively charged particles protons and the negatively charged particles electrons are revolving around the nucleus.
However, he failed to determine the energy and momentum of electrons as well the possibility of finding an electron inside an orbital. The circular paths or orbits through which the electrons are revolving have are fixed energy levels.
This fixed energy levels and momentum of electrons are later determined by Bohr's atomic model. Bohr's model helped to find the radius of atom and energy of orbitals with the aid of quantum mechanics.
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Which two trends increase when one moves across a period from left to right?
a) ionization energy and electronegativity
b) ionization energy and atomic size
c) electronegativity and atomic size
d) atomic size and size of cations
Answer is: a) ionization energy and electronegativity.
1) The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).
Barium, potassium and arsenic are metals (easily lost valence electrons), chlorine is nonmetal (easily gain electrons).
Alkaline metals (far left in Periodic table) have lowest ionizations energy and easy remove valence electrons (one electron), earth alkaline metals (next right to alkaline metals) have higher ionization energy than alkaline metals, because they have two valence electrons.
Nonmetals are far right in the main group and they have highest ionization energy, because they have many valence electrons.
2) Electronegativity (χ) is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.
Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom.
Nonmetals hava higher electronegativity than metals and metalloids.
3) The atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.
Ionization energy and electronegativity are the two trends than increase when one moves across a period from left to right.
Further ExplanationIonization energyIonization energy is the energy required to remove outermost electrons from the outermost energy level. Energy is required to remove an electron from an atom.The closer an electron is to the nucleus the more energy is required, since the electron is more tightly bound to the atom thus making it more difficult to remove, hence higher ionization energy.Ionization energy increases across the periods and decreases down the group from top to bottom. Additionally, the ionization energy increases with subsequent removal of a second or a third electron.First ionization energy This is the energy required to remove the first electron from the outermost energy level of an atom.Energy needed to remove the second electron to form a divalent cation is called the second ionization energy.Trends in ionization energy Down the group(top to bottom)Ionization energy decreases down the groups in the periodic table from top to bottom.It is because as you move down the group the number of energy levels increases making the outermost electrons get further from the nucleus reducing the strength of attraction to the nucleus.This means less energy will be required compared to an atoms of elements at the top of the groups.Across the period (left to right)Ionization energy increases across the period from left to right.This can be explained by an increase in nuclear energy as extra protons are added to the nucleus across the period increasing the strength of attraction of electrons to the nucleus.Consequently, more energy is needed to remove electrons from the nucleus. ElectronegativityElectronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself. Atoms with higher electronegativity attracts more electrons towards it, electrons are closer to that atom. Non-metals have higher electronegativity than metals and metalloids.Atomic radiusThe atomic radius decreases across the periods because an increasing number of protons, because greater attraction between the protons and electrons.Keywords: Ionization energy, electronegativity
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Subject: Chemistry
Topic: Periodic table and chemical families
Sub-topic: Ionization energy and electronegativity
What is the formula of a compound formed between nitrogen (N) and potassium (K)?
The mixture of potassium (K) and nitrogen (N) has the formula K3N.
What is a Mixture?A substance made up of two or more different chemical substances that are not chemically bonded is referred to as a mixture.
A mixture is a physical blending together of two or more substances while maintaining their identities. It can take the form of solutions, suspensions, or colloids.
For instance, water and salt are two different substances that, when combined, form seawater.
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What is the only element in group 1 on the periodic table that forms covalent bonds?
Answer:
Hydrogen.
Explanation:
The position of hydrogen was always controversial. It resembles both alkali metals and halogens.
However, it is placed with alkali metals in the periodic table in group 1.
The other elements are all metals and are able to give electrons easily so they form ionic bonds only.
While hydrogen can from covalent bond as it can share electrons.
Example : water.
Match the word with its definition.
1. that which causes an object to have inertia
Newton's Second Law
2. a special case of Galileo's Law of Inertia
momentum
3. force multiplied by time
Newton's First Law
4. velocity multiplied by mass
velocity
5.
mass
6. the acceleration of a mass directly proportional to the force acting on it
impulse
Answer:
1) Mass
2) Newton's First Law
3) Impulse
4) Momentum
5) Velocity
6) Newton's second law
Explanation:
1) Inertia is the tendency of matter to maintain constant velocity. Therefore, it is mass which causes an object to have inertia
2) As per Newtons first law of motion or law of inertia, a body of mass 'm' will continue to be in a state of rest or uniform motion unless acted upon by an external force. This is also a special case of Galileo's Law of Inertia.
3) Impulse is the product of force and time
4) Momentum is the product of velocity and mass
5) Velocity is the ratio of momentum by mass
6) As per Newton's second law of motion, the acceleration (a) of a body of mass (m) is directly proportional to the force (F) acting on it
[tex]F = ma[/tex]