Quiz about Law of Conservation of Mass / Physical and Chemical Changes

Question 1

What is a symbolic representation of a chemical reaction in which both sides of the equation contain equal numbers of atoms of each element?

Accepted Answer

Balanced Chemical Equation

Answer

Chemical Formula

Answer

Coefficient

Answer

Product

Question 2

What are chemical formulas and symbols written to represent a reaction?

Accepted Answer

Chemical Equation

Answer

Chemical Reaction

Answer

Law of Conservation of Matter

Answer

Reactant

Question 3

What is a shorthand notation that uses chemical symbols and numbers as subscripts to represent the type and number of atoms that are present in the smallest unit of a substance?

Accepted Answer

Chemical Formula

Answer

Coefficient

Answer

Product

Answer

Subscript

Question 4

What is the process by which one or more substances change to produce one or more different substances?

Accepted Answer

Chemical Reaction

Answer

Law of Conservation of Matter

Answer

Reactant

Answer

Endothermic Reaction

Question 5

What is a number placed in front of a chemical symbol or formula that represents the number of molecules?

Accepted Answer

Coefficient

Answer

Product

Answer

Subscript

Answer

Exothermic Reaction

Question 6

What is the scientific law stating that the mass of all reactants must equal the mass of all products; matter is neither created nor destroyed?

Accepted Answer

Law of Conservation of Matter

Answer

Reactant

Answer

Endothermic Reaction

Answer

Precipitate

Question 7

What is a substance produced during a chemical reaction?

Accepted Answer

Product

Answer

Subscript

Answer

Exothermic Reaction

Answer

Balanced Chemical Equation

Question 8

What is a substance that takes part in and undergoes change during a chemical reaction?

Accepted Answer

Reactant

Answer

Endothermic Reaction

Answer

Precipitate

Answer

Chemical Equation

Question 9

What is a number written below and to the right of a chemical symbol that shows the number of a specific type of atom present?

Accepted Answer

Subscript

Answer

Exothermic Reaction

Answer

Balanced Chemical Equation

Answer

Chemical Formula

Question 10

What is a chemical reaction in which heat is absorbed?

Accepted Answer

Endothermic Reaction

Answer

Precipitate

Answer

Chemical Equation

Answer

Chemical Reaction

Question 11

What is a chemical reaction in which heat is released?

Accepted Answer

Exothermic Reaction

Answer

Balanced Chemical Equation

Answer

Chemical Formula

Answer

Coefficient

Question 12

What is an insoluble solid formed from a chemical reaction?

Accepted Answer

Precipitate

Answer

Chemical Equation

Answer

Chemical Reaction

Answer

Law of Conservation of Matter

Question 13

What is the law of conservation of mass and how does it relate to chemical equations?

Accepted Answer

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction, and this principle is reflected in balanced chemical equations.

Answer

The law of conservation of mass asserts that mass can be created or destroyed in a chemical reaction, and this concept is represented by unbalanced chemical equations.

Answer

The law of conservation of mass suggests that mass is only conserved in physical changes, and chemical equations do not adhere to this principle.

Answer

The law of conservation of mass is irrelevant to chemical equations as they primarily focus on energy conservation rather than mass conservation.

Question 14

Why is it necessary to balance a chemical equation?

Accepted Answer

Balancing a chemical equation ensures that the reactants and products have the same number of atoms of each element, maintaining the law of conservation of mass.

Answer

Balancing a chemical equation is optional and does not have any impact on the accuracy of representing chemical reactions.

Answer

Balancing a chemical equation is necessary to change the nature of the reaction and make it more energetically favorable.

Answer

Balancing a chemical equation is only required for academic purposes and has no practical applications in the field of chemistry.

Question 15

What role do coefficients play in balancing a chemical equation?

Accepted Answer

Coefficients in a chemical equation represent the number of molecules of each substance involved in the reaction and are essential for balancing the equation.

Answer

Coefficients are used to indicate the state of matter of each substance in the reaction and have no impact on balancing the chemical equation.

Answer

Coefficients are arbitrary numbers that can be added to a chemical equation for aesthetic reasons, but they do not affect the accuracy of the representation.

Answer

Coefficients are irrelevant to balancing a chemical equation; only the subscripts in the chemical formulas are adjusted to achieve balance.

Question 16

How is mass conserved when a substance has a physical or chemical change?

Accepted Answer

Mass is conserved in both physical and chemical changes because the total mass of the reactants equals the total mass of the products.

Answer

Mass is not conserved in physical changes, but it is conserved in chemical changes due to the law of conservation of mass.

Answer

Mass is conserved in physical changes, but in chemical changes, some mass is lost or gained depending on the reaction.

Answer

Mass conservation is a theoretical concept and does not apply practically to either physical or chemical changes in substances.

Question 17

How is a physical change difference from a chemical change?

Accepted Answer

In a physical change, the composition of the substance remains the same, while in a chemical change, new substances with different compositions are formed.

Answer

A physical change involves a change in color, while a chemical change involves a change in shape.

Answer

In a physical change, there is always a release or absorption of energy, while in a chemical change, energy changes do not occur.

Answer

A physical change is characterized by the formation of new compounds, while a chemical change only involves alterations in the physical state of matter.

Question 18

What observable evidence is used to infer that a chemical reaction has occurred?

Accepted Answer

Change in color, production of a gas, formation of a precipitate, and change in temperature are all observable evidence that a chemical reaction has occurred.

Answer

Change in volume, increased pressure, and altered density are indicators that a chemical reaction has taken place.

Answer

Any alteration in the physical state, such as melting or freezing, is a clear sign of a chemical reaction.

Answer

Changes in odor and alterations in magnetic properties are key indicators that a chemical reaction has occurred.

Question 19

How does temperature influence a chemical change?

Accepted Answer

Temperature can affect the rate of a chemical reaction, influencing the speed at which reactants transform into products.

Answer

Temperature has no impact on chemical changes; it is solely a factor in physical changes.

Answer

Chemical changes occur only at extremely high temperatures, making temperature a critical factor in initiating reactions.

Answer

Chemical changes are unaffected by temperature variations, as they are solely dependent on the nature of the substances involved.

Question 20

When a reactant weighing 10 grams is mixed with another reactant weighing 8 grams within a sealed container, what would be the most plausible estimate for the total mass of the resulting products after the reaction?

Accepted Answer

18 g

Answer

2 g

Answer

8 g

Answer

10 g

Question 21

In a sealed container, Sarah blends a reactant weighing 8 grams with another reactant weighing 11 grams. Following the reaction, what would be the most logical expectation for the total mass of the products resulting from this reaction according to Sarah?

Accepted Answer

19 g

Answer

6 g

Answer

8 g

Answer

11 g

Question 22

Referring to the provided diagram, in the chemical reaction where carbonic acid decomposes into water, which additional compound ensures the conservation of mass?

Accepted Answer

Question 23

In adherence to the law of the conservation of mass, which of the following examples serves as an illustration that mass remains constant and is neither generated nor eliminated in typical chemical reactions?

Accepted Answer

When carbon dioxide is broken down into carbon and oxygen, the number of atoms remains the same.

Answer

When hydrogen and oxygen combine to make water, oxygen atoms are converted to hydrogen atoms.

Answer

When sodium and chlorine combine to make salt, some of the sodium is always lost.

Answer

When iron reacts with oxygen to form rust, the mass of the iron atoms increases.

Question 24

Which among the provided atomic models of chemical reactions accurately depicts the law of conservation of mass?

Accepted Answer

Question 25

Antonio conducts an experiment by introducing reactants into a sealed container, as depicted in the illustration. Following the reaction, which of the following can Antonio anticipate as the total mass of the resulting products?

Accepted Answer

24 g

Answer

5 g

Answer

14 g

Answer

19 g

Question 26

When a reactant weighing 4 grams is mixed with another reactant weighing 12 grams within a sealed container, what would be the most logical expectation for the total mass of the resulting products after the reaction?

Accepted Answer

16 g

Answer

3 g

Answer

4 g

Answer

12 g

Question 27

Defined as the interaction of chemicals resulting in new substances, a chemical reaction is illustrated. Considering the law of conservation of mass, what is the most logical inference regarding the composition of the missing product in the illustrated reaction?

Accepted Answer

One oxygen atom and three hydrogen atoms

Answer

One oxygen atom and one hydrogen atom

Answer

One chlorine atom and two hydrogen atoms

Answer

Two chlorine atoms and three hydrogen atoms

Question 28

Which statement accurately describes the atoms involved in a chemical reaction among the following options?

Accepted Answer

The same number of each type of atom will always be present before and after a chemical reaction takes place.

Answer

Some of the atoms present before the reaction will always be lost during a chemical reaction.

Answer

Some of the atoms will always be changed into a different type of atom by a chemical reaction.

Answer

During a chemical reaction, atoms will always be combined into much larger molecules.

Question 29

A chemical formula combines element symbols and subscript numbers to depict the composition of a substance, whether as a compound or in pure element form. Among the following chemical formulas, which one accurately exemplifies the law of conservation of mass?

Accepted Answer

Question 30

Which of the following examples presents evidence of a chemical change?

Accepted Answer

Sugar that is burned gives off an odor and turns brown and then black.

Answer

A sample of zinc is placed in water, and it settles to the bottom.

Answer

A solid block of ice is heated, and it completely melts into a liquid.

Answer

A sample of a mineral is broken down into smaller pieces.

Question 31

Monica and Andre are examining distinctions between physical and chemical changes, recording their observations in a table. Among the following, which observation did Monica and Andre mistakenly categorize?

Accepted Answer

Water boils, and steam is produced.

Answer

Salt is dissolved in water.

Answer

An aluminum can is crushed.

Answer

A sample of wood is burned.

Question 32

In a glow stick, the light we observe results from a chemical reaction. What action among the following is most likely to reduce the rate of this chemical reaction in the glow stick?

Accepted Answer

Place the glow stick in a freezer

Answer

Shake the glow stick more rapidly

Answer

Put the glow stick in hot water

Answer

Hold the glow stick close to a light

Question 33

On his science test, Charlie needs to offer an instance of a physical change. Which of the following would be an accurate answer?

Accepted Answer

A sample of dry ice is left out, in room temperature, and turns into a gas.

Answer

Calcium chloride and baking soda are mixed. and the temperature increases.

Answer

Milk curdles are formed when a jug of milk spoils because it is left out of the fridge.

Answer

Baking soda and vinegar are mixed together, and bubbles are formed.

Question 34

The image depicts the outcome when cold-medicine tablets are submerged in room temperature water. What signs would suggest that a chemical change has taken place?

Accepted Answer

Bubbles are given off.

Answer

The tablets dissolve in water.

Answer

The water becomes cloudy.

Answer

The water level increases slightly.

Question 35

Shauna is preparing breakfast for her family. At which stage of the breakfast preparation did Shauna witness a chemical change?

Accepted Answer

When she toasted bread and it turned brown

Answer

When she cracked eggs into a bowl and they changed shape

Answer

When she poured milk on cereal and it was no longer dry

Answer

When she squeezed oranges and the juice came out

Question 36

In a physical change, what occurs to differentiate it from a chemical change?

Accepted Answer

The properties of the substance may change, but no new substances are produced

Answer

The properties of the substance change for only a short time, but they will return to their original state.

Answer

An entirely new substance with new properties forms as a result of the change.

Answer

A new substance is produced, but the new substance has properties identical to the original substance.

Question 37

Four mixtures are created by combining two clear liquids, and observations are conducted. Among these mixtures, which one indicates that a chemical change has taken place?

Accepted Answer

Mixture 2: The liquids, when mixed, produce a white solid that settles to the bottom.

Answer

Mixture 1: The combined liquids have a greater mass than either of the starting liquids.

Answer

Mixture 3: The mixture of the two liquids takes the shape of the container.

Answer

Mixture 4: The denser of the two liquids lies below the other, less dense liquid.

Question 38

The provided illustration of a burning candle depicts several processes that occur during combustion. Which of these processes does not offer evidence of a chemical change?

Accepted Answer

Wax becomes liquid

Answer

Wick becomes black

Answer

Light given off

Answer

Heat given off

Question 39

Which graph among the following correctly illustrates the correlation between temperature and the rate of a chemical reaction?

Accepted Answer

Law of Conservation of Mass / Physical and Chemical Changes

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