Which states of matter have particles that move independently of one another with very little attraction?
A) gas and plasma
B) liquid and gas
C) solid, liquid, and gas
D) liquid, gas and plasma
the answer is a- gas and plasma. i took it on usa test prep.
Answer:
A) gas and plasma
Explanation:
planck's equation E = h x v is used to determine which of the following?
5. for the following measurements is expressed to three significant figures? a) 0.007 m b) 7077 mg c) 7.30 x 10^-7 km d) 0.070
Which describes the reaction of a substance to form one or more new substances? a physical change a change of state a chemical change?
Chemical change would be the answer.
What is the density of a piece of wood that has a mass of 2.74 g and a volume of 3.10 cm3?
The density of the piece of wood is approximately 0.88 g/cm³.
Explanation:The density of a substance can be calculated by dividing its mass by its volume. In this case, the mass of the piece of wood is 2.74 g and the volume is 3.10 cm³. To find the density, we divide the mass by the volume:
Density = Mass/Volume
Density = 2.74 g/3.10 cm³
Using a calculator, we find that the density of the piece of wood is approximately 0.88 g/cm³.
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The appropriate mixing ratio for a solution to kill bloodborne pathogens is 1 part chlorine to 10 parts water. If you are mixing a solution in a spray bottle with 15 ounces of water, how much chlorine do you need to add for the correct ratio
Answer:
1.5 ounces of chlorine is needed.
Explanation:
Ratio of the solution = 1 part chlorine: 10 parts water
let the volume of chlorine required to make the solution be x
Volume of the water used on solution = 15 ounces
Ratio of chlorine to water will remain equal to the 1 part chlorine to 10 parts water:
[tex]\frac{x}{15 ounces}=\frac{1}{10}=1.5 ounces[/tex]
1.5 ounces of chlorine is needed.
Which electron in magnesium is most shielded from nuclear charge?
Explanation:
The sum of total charge of all the protons present inside the nucleus of an atom is known as the nuclear charge.
As the size of an atom increase there occurs a decrease in nuclear charge. This is because number of shells increases as the size of an atom increases. Therefore, force of attraction between the nucleus of the atom and its outermost electrons decreases.
It means electrons are shielded by the number of shells.
Due to this valence electrons can be easily lost by the atom in a chemical reaction.
Atomic number of magnesium is 12 and its electronic configuration is [tex]1s^{2}2s^{2}2p^{6}3s^{2}[/tex].
Hence, nuclear charge felt by the electrons present in 3s sub-shell will be the least.
Thus, we can conclude that electron is 3s subshell in magnesium is most shielded from nuclear charge.
What is the name of the molecular compound that has the formula P2S5
The molecular compound with the formula P₂S₅ is named diphosphorus pentasulfide. Phosphorus is written first as it is less electronegative than sulfur.
The name of the molecular compound with the formula P₂S₅ is diphosphorus pentasulfide. In naming such compounds, the prefix 'di-' indicates the presence of two phosphorus atoms and the prefix 'penta-' indicates the presence of five sulfur atoms.
The rules for naming molecular compounds involve using prefixes to denote the number of atoms. The element written first is generally the one that is less electronegative, in this case, phosphorus. Therefore, the compound P₂S₅ is named diphosphorus pentasulfide.
Scientific notation 0.000002
The exponent just on ten will be the amount of decimal points you advance. The scientific notation of 0.000002 is 2x10⁻⁶.
What is scientific notation?Scientific notation is indeed a method of communicating numbers that are either too large or too little to be represented in decimal form. It is also known as 'scientific form' in the United Kingdom, and it is often used among scientists, mathematicians.
The first is merely the digits, with both the decimal place put after the very first digit, and the second is multiplication by 10 to a components impacting of decimal points, which places the decimal place where it used to be. Shift the decimal towards left of decimal point to ensure that there is 1 non-zero digit. The exponent just on ten will be the amount of decimal points you advance. The scientific notation of 0.000002 is 2x10⁻⁶.
Therefore, the scientific notation of 0.000002 is 2x10⁻⁶.
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Which of the following statements does not describe a chemical property of oxygen:
1)Oxygen combines with carbon to form carbon dioxide gas
2) When coal is burned in oxygen, the process is called combustion
3)Iron will rust in the presence of oxygen
4)The pressure is caused by collision of oxygen molecules with the sides of a container
Can you help me with these 5 questions 5 pts each
Is a dilute solution of copper ii sulfate in water homogeneous or heterogeneous?
What ability allows carbon atoms to form a large number of molecules?
What observation led Bohr to believe that electrons had certain, finite, discrete, EXACT amounts of energies and thus were on quantized energy levels?
What can be said about the polarity of water?
Nickel metal is added to a solution of copper(ii) nitrate. express your answer as a chemical equation. identify all of the phases in your answer. enter no reaction if no reaction occurs.
The chemical equation will be[tex]\rm \bold{Ni\;(s)+\;Cu(NO_3)_2\;(aq)\rightarrow\;Cu\;(s)+Ni(NO_3)_2\;(aq)}[/tex].
Nickel and Copper belong to group 4 of the periodic table. According to the trend, nickel has been more reactive than copper and has been able to displace copper in the compound.
The reaction between copper nitrate and nickel will be the displacement reaction.
The reaction will be:
[tex]\rm Ni\;+\;Cu(NO_3)_2\;\rightarrow\;Cu\;+Ni(NO_3)_2[/tex]
The reaction has nickel in the solid state, and copper nitrate in the aqueous state, the nickel nitrate solution will be formed with precipitated solid copper.
The reaction will be:
[tex]\rm \bold{Ni\;(s)+\;Cu(NO_3)_2\;(aq)\rightarrow\;Cu\;(s)+Ni(NO_3)_2\;(aq)}[/tex]
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Which equation will you use to calculate the volume of a 5.00 liter sample of air at 50°C when it is warmed to 100°C at constant pressure?
Answer : The final volume of gas will be, 5.77 liters
Explanation :
Charles' Law : It is defined as the volume of the gas is directly proportional to the temperature of the gas at constant pressure and number of moles.
[tex]V\propto T[/tex]
or,
[tex]\frac{V_1}{V_2}=\frac{T_1}{T_2}[/tex]
where,
[tex]V_1[/tex] = initial volume of gas = 5.00 L
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]50^oC=273+50=323K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]100^oC=273+100=373K[/tex]
Now put all the given values in the above formula, we get the final volume of the gas.
[tex]\frac{5L}{V_2}=\frac{323K}{373K}[/tex]
[tex]V_2=5.77L[/tex]
Therefore, the final volume of gas will be, 5.77 liters
Which of the following is an example of kinetic energy? (2 points) Select one: a. chemical energy b. gravitational energy c. nuclear energy d. thermal energy
Identify the species oxidized. 2 al3+(aq) + 2 fe(s) → 2 al(s) + 3 fe2+(aq)
The species oxidized in the reaction is Iron Fe.
The oxidation number assigned to Al is +3
The oxidation number assigned to Fe is +2
Here, in the reaction the oxidation number of iron Fe is increased to +3
Hence, we can conclude that the species oxidized in the reaction is Iron Fe.
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The density of a mystery solid is 1.00 g/cm3. will this float or sink in pure water?
Answer: The mystery solid will sink.
Explanation:
Density is defined as the ratio of mass and volume of the object. The formula used to calculate density is:
[tex]\text{Density of object}=\frac{\text{Mass of the object}}{\text{Volume of the object}}[/tex]
If the density of an object is less than the density of the liquid, the object will float in the liquid.If the density of an object is more than the density of the liquid, the object will sink in the liquid.We are given:
Density of mystery solid = [tex]1.00g/cm^3[/tex]
We know that:
Density of pure water = [tex]0.9982g/cm^3[/tex]
As, the density of mystery solid is more than the density of water. So, the object will sink into the pure water.
The mystery solid will neither float nor sink in pure water.
Explanation:The density of a mystery solid is 1.00 g/cm3. To determine whether it will float or sink in pure water, we need to compare the density of the solid with the density of water. If the density of the solid is less than the density of water (1.00 g/cm3), it will float. However, if the density of the solid is greater than the density of water, it will sink.
In this case, since the density of the mystery solid is equal to the density of water, 1.00 g/cm3, the solid will neither float nor sink in pure water. It will remain suspended at the water's surface.
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In group 13, the only metalloid, boron, is at the very top of the group. Explain why the rest of the group has mettalic behavior but boron doesnt
Answer:
Boron is electron-deficient, possessing a vacant p-orbital.
Explanation:
Boron is the only non-metal of the group 3A or group 13 of the periodic table the elements. All group 3A member elements are electropositive ( they have the tendency to loose electron in chemical reactions).
Boron is electron-deficient and possesses a vacant p-orbital. Also, Boron is the least electronegative non-metal, so it readily loses electrons when reacting.
Although, Boron is not a complete non-metal, it is metalloid (that is, boron has the characteristics of metals and non-metals).
Boron can exist in the crystalline form and amorphous form.
The group 3A or group 13 consist of Boron, Aluminum, Gallium, Indium and Thallium. All the elements have 3 valence electrons
Name an element that has similar to silver in the periodic table
Elements which have similar properties to silver are copper and gold as they are present in the same group.
Why are properties similar along a group?Properties depend on the number of valence electrons an element possesses.Elements in the same group have the same number of valence electrons as for every new element in a group a new shell is added, although the number of valence electrons is same.
Since, the number of valence electrons for all elements in a group is same ,elements in the group have similar properties.Only the size of the atom increases down the group as a successive shell is added for every element which increases the distance between valence shell and nucleus.
The reactivity of elements depends on distance between valence electrons and nucleus.On moving down the group , reactivity increases as the distance between valence shell and nucleus increases.
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A chemical engineer has determined by measurements that there are 0.040 moles of carbon in a sample of methyl tert-butyl ether. how many moles of oxygen are in the sample?
Are compounds pure substance containing two or more elements that are chemically combined
What is the most important change in a chemical change?
1) identity
2)shape
3)size
4)form
5)state
How many moles of magnesium chloride are formed when 55 ml of 0.70 m hcl is added to 42 ml of 1.204 g mg(oh)2?
To find the moles of magnesium chloride formed, first calculate the moles of HCl and Mg(OH)2. Then, use the stoichiometry of the balanced chemical equation to determine the moles of MgCl2. The moles of MgCl2 formed will be half of the moles of HCl.
Explanation:To calculate the moles of magnesium chloride formed when 55 mL of 0.70 M HCl is added to 42 mL of 1.204 g Mg(OH)2, we need to determine the limiting reactant and use stoichiometry. First, let's calculate the moles of HCl:
Moles of HCl = concentration (M) x volume (L) = 0.70 M x 0.055 L = 0.0385 moles HCl
Next, let's calculate the moles of Mg(OH)2:
Moles of Mg(OH)2 = mass / molar mass = 1.204 g / (24.31 g/mol + 2(16.00 g/mol) + 2(1.008 g/mol)) = 0.0100 moles Mg(OH)2
From the balanced chemical equation, we know that 2 moles of HCl reacts with 1 mole of Mg(OH)2 to form 1 mole of MgCl2. Therefore, the moles of MgCl2 formed will be half of the moles of HCl, which is:
Moles of MgCl2 = 0.0385 moles HCl / 2 = 0.0193 moles MgCl2
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A mixture of 2 or more substances in which the molecules of the substances are evenly mixed
Henri Becquerel and the Curies found out that _____.
atoms were not indivisible and indestructible
the atom had a nucleus
there was a lot of empty space in the atom
atoms were very small
Henri becquerel and the curies found out that:
atoms were not indivisible and indestructible
Explanation:
The French Physicist, Henri Becquerel, created the appearance of radioactivity. He shared the Nobel Prize in Physics with Marie Curie and Pierre Curie (Marie's husband) in 1903 for their work in radiation. A radionuclide will emit transmission through the process of radioactive sense.
The phosphate functional group in the non cyclic amp molecule of question 21 contains "acidic hydrogens"
Are criminals rational decision makers, or are most of them motivated by uncontrollable psychological and emotional drives or social forces such as poverty and despair?
Final answer:
Economic models suggest criminals conduct a cost-benefit analysis before committing crimes, yet factors like poverty and desperation also drive criminal behavior, complicating the idea of purely rational criminal decision-making.
Explanation:
The question of whether criminals are rational decision makers or driven by other factors such as psychological, emotional, and social forces is complex. Economic models of criminal behavior suggest that criminals weigh the benefits of a crime against its costs in a rational manner. However, individuals may also commit crimes due to poverty, desperation, or social environment, which indicates that not all criminal behavior is the result of a logical cost-benefit analysis. Factors such as poverty, lack of opportunity, and individual personality traits play significant roles in influencing criminal behavior.
Moreover, the opportunity cost of time is an important consideration; individuals choose to engage in crime when the potential gains are seen as outweighing the gains from legal activities. Nonetheless, the sociological perspective considers the broader impact of laws and whether certain legal frameworks may cause more harm than good, suggesting a need for a more nuanced understanding of criminal activity.