Unit 4 Test on Conservation of Matter

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2

Hydrogen and oxygen react chemically to form water. How much water would form if 14.8 g of hydrogen reacted with 34.8 g of oxygen?

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3

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5

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4

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5

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5

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1

In a chemical reaction

Some atoms disappear while others multiply to form the products

The atoms of the reactants unbond, rearrange, and then rebond to form the products

The atoms of the reactants always stay together to form the products

New atoms are formed which combine to make the products

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1

Using the chemical reaction, CH₄ + 2O₂ → CO₂ + 2H₂O if you count the atoms in the reactants, there are

1 carbon atom, 4 hydrogen atoms, and 2 oxygen atoms

4 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms

1 carbon atom, 4 hydrogen atoms, and 4 oxygen atoms

4 carbon atoms, 4 hydrogen atoms, and 4 oxygen atoms

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1

In a chemical reaction, mass is conserved. This means that

The type and number of atoms in the reactants equals the type and number of atoms in the products

The molecules of the reactants do not change during a chemical reaction

The mass of the products is always twice the mass of the reactants.

The mass of the products stays the same during a chemical reaction

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1

If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂the products in a balanced equation could be

4CO₂ + 3H₂O

3CO₂ + 4H₂O

3CO + 4H₂O

2CO₂ + 3H₂O

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1

If more reactants are used in a chemical reaction, more products will be produced. This is because

More reactants take up the same volume

More reactants have more atoms to react to form more products

Too many products can slow down the reaction

More reactants cause the reaction to heat up

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If two substances react and the temperature of the mixture increases, the reaction is

Not one that produces anything new

One that needs a catalyst

Endothermic

Exothermic

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1

A chemical equation is shown below.
2H₂O ➜ 2H₂ + O₂
Which of the following choices is/are the product(s) of this chemical reaction?

2H₂

2H₂and O₂

2H₂O

O₂

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1

A chemical equation is shown below.
2H₂O ➜ 2H₂ + O₂
Which of the following choices is the reactant of this chemical reaction?

2H₂and O₂

2H₂O

2H₂

O₂

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1

Students have two identical beakers with a mass of 20 grams each. The students pour a different liquid reactant into each beaker. The total mass of the two beakers with the reactants is 50 grams. Next, the students combine Reactant 1 and Reactant 2 into one of the beakers. A chemical reaction produces a product.
If all of the reactants are consumed and no gases are produced, what is the total mass of the product and one beaker?

20 grams

30 grams

50 grams

40 grams

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1

When you burn a candle, all that remains is a small puddle of wax. The puddle of wax has less mass than the original candle. The rest of the original candle’s mass was

destroyed.

none of the above

changed to gases.

measured incorrectly.

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6

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A sample of copper powder is heated in an evaporating dish using a Bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that

the copper must have combined with another substance.

the copper must have lost matter.

hot copper is more dense than cold copper.

hot copper weighs more than cold copper.

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1

The images below are models that represent the reactants and products of a chemical reaction.
Based on the models, was mass conserved in this chemical reaction?

No, because the reactants are made up of different types of molecules than the products.

Yes, because the number of reactant molecules is the same as the number of product molecules.

No, because the purple atom formed two bonds in its reactant molecule and only one bond in its product molecule.

Yes, because the number of each type of atom is the same in the products as it is in the reactants.

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1

The chemical equation below shows the formation of ammonia from nitrogen and hydrogen gases.
N₂ + H₂ -----> NH₃

However, the equation shown is not balanced. Which of the following particle diagrams shows the correct balanced form of the equation?

C

A

B

D

Unit 4 Test on Conservation of Matter

Hydrogen and oxygen react chemically to form water. How much water would form if 14.8 g of hydrogen reacted with 34.8 g of oxygen?

In a chemical reaction

Using the chemical reaction, CH4 + 2O2 → CO2 + 2H2O if you count the atoms in the reactants, there are

In a chemical reaction, mass is conserved. This means that

If the reactants on the left side of a chemical equation are C3H8 + 5O2 the products in a balanced equation could be

If more reactants are used in a chemical reaction, more products will be produced. This is because

If two substances react and the temperature of the mixture increases, the reaction is

A chemical equation is shown below.2H2O ➜ 2H2 + O2Which of the following choices is/are the product(s) of this chemical reaction?

A chemical equation is shown below.2H2O ➜ 2H2 + O2Which of the following choices is the reactant of this chemical reaction?

When you burn a candle, all that remains is a small puddle of wax. The puddle of wax has less mass than the original candle. The rest of the original candle’s mass was

A sample of copper powder is heated in an evaporating dish using a Bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that

The images below are models that represent the reactants and products of a chemical reaction.Based on the models, was mass conserved in this chemical reaction?

The chemical equation below shows the formation of ammonia from nitrogen and hydrogen gases.N2 + H2 -----> NH3However, the equation shown is not balanced. Which of the following particle diagrams shows the correct balanced form of the equation?

Hydrogen and oxygen react chemically to form water. How much water would form if 14.8 g of hydrogen reacted with 34.8 g of oxygen?

In a chemical reaction

Using the chemical reaction, CH4 + 2O2 → CO2 + 2H2O if you count the atoms in the reactants, there are

In a chemical reaction, mass is conserved. This means that

If the reactants on the left side of a chemical equation are C3H8 + 5O2 the products in a balanced equation could be

If more reactants are used in a chemical reaction, more products will be produced. This is because

If two substances react and the temperature of the mixture increases, the reaction is

A chemical equation is shown below.2H2O ➜ 2H2 + O2Which of the following choices is/are the product(s) of this chemical reaction?

A chemical equation is shown below.2H2O ➜ 2H2 + O2Which of the following choices is the reactant of this chemical reaction?

When you burn a candle, all that remains is a small puddle of wax. The puddle of wax has less mass than the original candle. The rest of the original candle’s mass was

A sample of copper powder is heated in an evaporating dish using a Bunsen burner. If the mass of the powder in the evaporating dish increases after heating, this indicates that

The images below are models that represent the reactants and products of a chemical reaction.Based on the models, was mass conserved in this chemical reaction?

The chemical equation below shows the formation of ammonia from nitrogen and hydrogen gases.N2 + H2 -----> NH3However, the equation shown is not balanced. Which of the following particle diagrams shows the correct balanced form of the equation?

Using the chemical reaction, CH₄ + 2O₂ → CO₂ + 2H₂O if you count the atoms in the reactants, there are

If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂the products in a balanced equation could be

A chemical equation is shown below.
2H₂O ➜ 2H₂ + O₂
Which of the following choices is/are the product(s) of this chemical reaction?

A chemical equation is shown below.
2H₂O ➜ 2H₂ + O₂
Which of the following choices is the reactant of this chemical reaction?

The images below are models that represent the reactants and products of a chemical reaction.
Based on the models, was mass conserved in this chemical reaction?

The chemical equation below shows the formation of ammonia from nitrogen and hydrogen gases.
N₂ + H₂ -----> NH₃

However, the equation shown is not balanced. Which of the following particle diagrams shows the correct balanced form of the equation?

Using the chemical reaction, CH₄ + 2O₂ → CO₂ + 2H₂O if you count the atoms in the reactants, there are

If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂the products in a balanced equation could be

A chemical equation is shown below.
2H₂O ➜ 2H₂ + O₂
Which of the following choices is/are the product(s) of this chemical reaction?

A chemical equation is shown below.
2H₂O ➜ 2H₂ + O₂
Which of the following choices is the reactant of this chemical reaction?

The images below are models that represent the reactants and products of a chemical reaction.
Based on the models, was mass conserved in this chemical reaction?

The chemical equation below shows the formation of ammonia from nitrogen and hydrogen gases.
N₂ + H₂ -----> NH₃

However, the equation shown is not balanced. Which of the following particle diagrams shows the correct balanced form of the equation?