Final answer:
A soft element that can be cleanly cut with a knife is likely a metal due to metals being malleable and ductile, in contrast to the brittleness of nonmetals.
Explanation:
An element that is soft and can be easily cut with a knife is likely to be a metal. This observation is in line with the known properties of metals. Metals are known to be good conductors of electricity and heat, shiny, silvery, solid, and exhibit malleability which allows them to be hammered or pressed into thin sheets, and ductility which means they can be drawn out into thin wires.
On the other hand, nonmetals are usually brittle in their solid forms and do not have the malleability that metals possess. Based on these definitions and properties, the characteristics of being soft and easily cut suggest that the element in question exhibits metallic properties. Alkali metals, in particular, are known for their softness and can indeed be cut with a simple lab spatula.
What is the only subatomic particle that is directly involved in chemical reactions between atoms?
For resonance forms of a molecule or ion, ________.
Which indicator most likely suggests that a chemical change is taking place?
change in size
change of color
change of state
change in shape
Change in color is an indicator which most likely suggests that a chemical change is taking place. Most of the chemical indicators show a change in color with a proceed in the process. Thus, the correct option is B.
What are chemical indicators?
A chemical change occurs when a new substance (product) is formed or the original substance changes its identity and composition in presence of certain conditions due to a chemical reaction.
Chemical change is the opposite of a physical change which results due to modifications only in the physical properties such as the state or shape of matter. Moreover, a chemical reaction can be identified as it often leads to a change in color, odor, the emission of gases or temperature change. This implies that a chemical change is a change of color as this occurs if the composition of a substance change.
Therefore, the correct option is B.
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HELP PLEASE !!! WILL GIVE BRAINLIEST !
A chef places sugar crystals in a cooking pan. He turns on the burner under the pan. In a few minutes, the sugar begins to melt. Which process is most directly responsible for transferring heat from the burner into the sugar?
radiation
convection
conduction
resonance
The human body obtains 955 kJ of energy from a candy bar.? If this energy were used to vaporize water at 100.0 ∘C, how much water (in liters) could be vaporized? (Assume the density of water is 1.00 g/mL.)
Final answer:
Using the enthalpy of vaporization for water, the energy from a candy bar could vaporize approximately 0.421 liters of water at 100°C.
Explanation:
To determine how much water could be vaporized from the energy obtained from a candy bar, we need to use the enthalpy of vaporization of water at 100°C, which is given as 40.7 kJ/mol. This value tells us the amount of energy needed to convert one mole of water from liquid to gas at these conditions.
First, we convert the energy in kJ from the candy bar to moles of water using the enthalpy of vaporization:
955 kJ × (1 mol / 40.7 kJ) = 23.46 moles of water
Next, we'll convert the moles of water to grams since we know the molar mass of water is approximately 18 g/mol:
23.46 moles × 18 g/mol = 421.28 grams of water
Finally, given that the density of water is 1.00 g/mL and that 1 liter equals 1000 mL, we convert grams to liters:
421.28 g × (1 mL / 1 g) × (1 L / 1000 mL) = 0.421 L of water
Therefore, the energy from the candy bar could vaporize approximately 0.421 liters of water.
what is the definition of a lewis base?
B. A substance that donates electron to form a covalent bond
The time it takes for 50% of an unstable isotope to decay to a stable form is called the
A mixture of gasoline and air explodes when it encounters a spark. this is known as
Answer:
a Cumbustion reaction, i just did it
Explanation:
Their respective charges are what for electrons neutrons and protons
Electrons are negatively charged
Neutrons are neutrally charged
Protons are positively charged
Perform an on-line search to discover what conditions are favourable to the growth of moss. be sure to include a comment on ph conditions.
Which of these redox reactions is spontaneous as written? (a)Ag + Cu2+ → Ag+ + Cu (b)Al + H+ → Al3+ + H2 (c)H2 + Al3+ → H+ + Al (d)Na + K+ → Na+ + K
Answer: The correct answer is Option b.
Explanation:
The given reactions are the examples of single displacement reactions.
Single displacement reactions are defined as the reactions in which more reactive metal replaces the less reactive metal from its chemical reaction. The reactivity of metals is given by the series known as reactivity series.
The metals which lie above in the series can replace the metals which lie low in the reactivity series.
[tex]A+BX\rightarrow AX+B[/tex]
For the given options:
Option a: [tex]Ag+Cu^{2+}\rightarrow Ag^++Cu[/tex]
Silver lies low in the series than copper and hence is less reactive. Therefore, it will not replace copper. Thus, this is a non-spontaneous reaction.
Option b: [tex]Al+H^+\rightarrow Al^{3+}+H_2[/tex]
Aluminium lies above in the series than hydrogen and hence is more reactive. Therefore, it will easily replace hydrogen. Thus, this is a spontaneous reaction.
Option c: [tex]H_2+Al^{3+}\rightarrow H^++Al[/tex]
Hydrogen lies low in the series than aluminium and hence is less reactive. Therefore, it will not replace aluminium. Thus, this is a non-spontaneous reaction.
Option d: [tex]Na+K^+\rightarrow Na^++K[/tex]
Sodium lies low in the series than potassium and hence is less reactive. Therefore, it will not replace potassium. Thus, this is a non-spontaneous reaction.
Hence, the correct answer is Option b.
The graph above shows the progress of a chemical reaction. Based on the graph, which of the following is true?
Select one: a. Reaction A is enzyme-catalyzed, while reaction B is not enzyme-catalyzed. b. Reaction A is not enzyme-catalyzed, while reaction B is enzyme-catalyzed. c. Reaction A uses cofactors, while reaction B does not use cofactors. d. Reaction A does not use cofactors, while reaction B uses cofactors.
Answer: b. Reaction A is not enzyme-catalyzed, while reaction B is enzyme-catalyzed
Explanation:
Activation energy is the extra energy that must be supplied to reactants in order to cross the energy barrier and thus convert to products. It is the difference between the energy of activated complex and energy of reactants.
A catalyst is a substance which increases the rate of a reaction by taking the reaction through a different path which involves lower activation energy and thus more molecules can cross the energy barrier and convert to products.
The catalyst itself does not take part in the chemical reaction and is regenerated as such at the end.
How can you tell when the hydrolysis of starch is complete why does the test work this way?
What are the constituent element of potassium sorbate??
How many more electrons can fit within the valence shell of a oxygen atom?
An oxygen atom can accommodate 2 more electrons in its valence shell by forming two single bonds or one double bond to satisfy the octet rule.
The question concerning the number of additional electrons that can fit within the valence shell of an oxygen atom relates to its electron configuration and bonding capabilities. An oxygen atom typically has 6 electrons in its valence shell. To satisfy the octet rule, an oxygen atom requires 2 more electrons to complete its outermost shell. Oxygen achieves this by forming two single bonds with other atoms or one double bond, sharing electrons to fill the valence shell and reach a stable configuration with 8 electrons.
Oxygen, being in group 6 of the periodic table, has a valence electron count of 6 (electronic configuration: 2s²2p⁴). This means that the atom has two electrons that can pair up with electrons from other atoms, giving oxygen a valency of 2. By forming bonds, oxygen can have a filled valence shell with a total of 8 electrons, achieving the stable octet configuration.
Solve if an element has a charge of 2+, how many more protons does it have than electrons? protons
Final answer:
An element with a 2+ charge has two more protons than electrons, as protons have a positive charge of +1 each.
Explanation:
If an element has a charge of 2+, it means that the element has two more protons than electrons. Since protons carry a positive charge of +1, a 2+ charge indicates that the number of protons exceeds the number of electrons by two. For example, calcium has an atomic number of 20, meaning it has 20 protons. As a Ca2+ ion, it would have 18 electrons, as it would have lost two electrons to acquire the 2+ charge.
Which element(s) is being reduced in the redox reaction below? 6 nh4clo4 (s) + 10 al(s) 5 al2o3 (g) + 6 hcl (g) + 3 n2 (g) + 9 h2o (g) n and al h cl o?
An aqueous solution that is 20.0 percent sulfuric acid (h2so4) by mass has a density of 1.105 g/ml. determine the molarity of the solution.
The definition of molarity is:
Molarity = moles of solute / total volume of solution in Liters
In this case, our solute is Sulfuric Acid. To solve this problem, let us assume a basis for calculation.
Let us say that,
Total mass of solution = 100 g
Therefore mass of H2SO4 = 20 g
The molar mass of H2SO4 = 98.079 g / mol
Calculating for number of moles of H2SO4:
number of moles = 20 g / (98.079 g / mol)
number of moles = 0.204 mol
Calculating for the volume of solution using the density:
total volume of solution = 100 g / (1.105 g / mL)
total volume of solution = 90.50 mL = 0.0905 L
Therefore the molarity is:
Molarity = 0.204 mol / 0.0905 L
Molarity = 2.2542 mol / L
Molarity = 2.25 M
4 NH3 + 6 NO → 5 N2 + 6 H2O How many moles of NH3 are necessary to produce 0.824 mol N2?
The number of moles of NH₃ that are necessary to produce 0.824 mol N₂ is 0.6592 mol.
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance. Mass is defined as the product of the compound's molar mass and the moles of the substance.
Many compounds have a molar mass that may be estimated by dividing the compound's mass by the number of moles. A physical body's mass is the amount of matter it contains. Ammonia is a gas and nitrogen is also a gas.
4 mol NH₃ → 5 mol N₂
x mol NH₃ → 0.824 mol N₂
x = 0.824 x 4/5 = 0.6592 mol
Therefore, the number of moles of NH₃ that are necessary to produce 0.824 mol N₂ is 0.6592 mol.
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An aerosol can of compressed air has the following warning label: “WARNING: Contents under pressure. Do not expose can to heat or flame. Do not crush can.” Using what you know about volume, pressure, and temperature, explain this warning.
Heating the can increases the kinetic energy of the gas molecules.
Increasing the kinetic energy of the gas molecules increases the pressure of the gas on the can.
Crushing the can reduces its volume.
As volume decreases, the pressure inside the can increases because the gas molecules collide with the can’s walls more often.
If the pressure gets too high, the can may explode.
are the answers for edg
Heating can cause an increase in the kinetic energy of molecules. As the air is compressed the volume decreases and the pressure will be high.
What is Boyle's law?Boyle’s law can be described as the pressure acted by a given mass of gas at a constant temperature of the gas being inversely proportional to the volume of the gas.
The pressure and volume are inversely proportional as long as the temperature is kept constant.
P ∝ 1/V
P₁.V₁ = P₂.V₂ ...........(1)
The heating of the aerosol can cause an increase in the kinetic energy of gas molecules. When the air is compressed, its volume decreases, and the pressure will be high. As the temperature increased, the volume of the gas is also directly proportional to the temperature.
Therefore, the heating will increase the temperature and the volume of the compressed air. Therefore, it can explode in the presence of heat.
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How many liters of oxygen are required to burn 3.86 l of carbon monoxide?
Answer:
Explanation:
3.86 L CO x 1 mol O2 x 1mole O2 x 22.4 L O2 = 1.93 L O2
22.4 L CO 2 mole CO 1 mole O2
The volume of oxygen, O₂ in litre (L) required to burn 3.86 L of carbon monoxide , CO is 1.93 L
Balanced equation
2CO + O₂ —> 2CO₂
From the balanced equation above,
2 L of CO requires 1 L of O₂
How to determine the volume of O₂ requiredFrom the balanced equation above,
2 L of CO requires 1 L of O₂
Therefore,
3.86 L of CO will require = 3.86 / 2 = 1.93 L of O₂
Thus, 1.93 L of O₂ is needed for the reaction
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Determine the number of three egg omelets that can be prepared from 4 dozen eggs
4 dozen eggs= 48 eggs
48 eggs/ 3 eggs
16 three egg omelets can be made
Which of the following is a product formed when so2 and h2o react together?
Answer: The product formed from the reaction of these two is sulfurous acid.
Explanation:
When sulfur dioxide reacts with water molecule, it leads to the formation of an acid known as sulfurous acid.
The chemical reaction for the combination of sulfur dioxide and water follows the equation:
[tex]SO_2(g)+H_2O(l)\rightarrow H_2SO_3(aq.)[/tex]
By Stoichiometry of the reaction:
1 mole of sulfur dioxide reacts with 1 mole of water molecule to produce 1 mole of sulfurous acid.
Hence, the product formed from the reaction of these two is sulfurous acid.
Something with a density greater than 1.00 g ml
Calculate the mass percent (m/m) of a solution prepared by dissolving 55.84 g of nacl in 152.7 g of h2o.
The mass percent ( m ÷ m ) of a solution prepared by dissolving 55.84 g of NaCl in 152.7 g of H₂O is 26.78 %
What is mass ?
Mass is a physical body's total amount of matter. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term.
The intensity of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram is the primary mass unit in the SI.
The amount of matter that makes up every item or body is the greatest way to understand mass. Everything that we can see has mass. Examples of objects with mass include a table, a chair, your bed, a football, a glass, and even air.
m ( NaCl) = 55.84 g and m ( H2O ) = 157.2 g.
m ( solution) = m ( NaCl ) + m ( H₂O )
w ( NaCl ) = 100 m ( NaCl ) ÷ m ( solution ) = 100 m ( NaCl ) / ( m ( NaCl ) + m ( H₂O )
w ( NaCl ) = 100 × 55.84/ ( 55.84+152.7 ) = 26.78%
Thus, the mass percent ( m ÷ m ) of a solution prepared by dissolving 55.84 g of NaCl in 152.7 g of H₂O is 26.78 %
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The best recrystallization solvent for benzil was ethanol. what would be the consequence of using acetone as the recrystallization solvent for benzil? explain.
Write the complete balanced equation for the following reaction: (3 points) NaBr + Ca3(PO4)2 yields CaBr2 + Na3PO4
HELP PLEASE
Answer: The balanced chemical equation is given below.
Explanation:
Every balanced chemical equation follows law of conservation of mass.
This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form. This law also states that total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side.
For the given reaction, the balance chemical equation follows:
[tex]6NaBr+Ca_3(PO_4)_2\rightarrow 3CaBr_2+2Na_3PO_4[/tex]
By stoichiometry of the reaction:
6 moles of sodium bromide reacts with 1 mole of calcium phosphate to produce 3 moles of calcium bromide and 2 moles of sodium phosphate.
Determine how many grams of silver would be produced, if 12.83 x 10^23 atoms of copper react with an excess of silver nitrate. Given the equation: Cu + 2AgNO3 -> Cu(NO3)2 + 2Ag Avogadro's number: 6.02 x 1023
The ground-state configuration of fluorine is ________.
What are the substances that interact to form new substances in a chemical reaction called?
Answer:
Reactants or Products?
The answer is reactants.
Reactants Definition- A reactant is the chemical substances present at the start of a chemical reaction.
A products definition is the substance produced in a chemical reaction.
The answer is reactants because they start at the beginning of a chemical reaction, and have to interact with other substances to make a product. product is not able to interact with new substances, nor make new substances. Therefore, in a chemical reaction, if you want the substances to interact, and form new substances, it has to be a reactant.
A way to remember this is think of it as if you are a reactant and you are interacting to form new substances.