Periodic Table + Chemical Reactions

The following chemical reaction occurs.

2H2O2 → 2H2O + O2

How many atoms of hydrogen are involved in the reaction?

• 1

• 2

• 4

• 8

Tags

NGSS.MS-PS1-1

Which equation satisfies the Law of Conservation of Mass?

• C3H8 + O2 → CO2 + H2O

• C3H8 + O2 → 3CO2 + 4H2O

• C3H8 + 5O2 → 3CO2 + 4H2O

Tags

NGSS.MS-PS1-5

Which is true of mass during a chemical reaction?

• Mass increases

• Mass decreases

• Mass remains the same

• Mass depends on the chemicals involved

Tags

NGSS.MS-PS1-5

What coefficient for O2 demonstrates the law of conservation of mass?

CH4(g) + __O2(g) → CO2(g) + 2H2O(g)

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

Which best represents a balanced equation?

• Mg(s) + 2O2(g) 2MgO(s)

• Mg(s) + O2(g) 2MgO(s)

• 2Mg(s) + O2(g) 2MgO(s)

Tags

NGSS.MS-PS1-5

How many copper atoms and how many chlorine atoms are in a molecule of CuCl2?

• one copper atom, one chlorine atom

• one copper atom, two chlorine atoms

• two copper atoms , one chlorine atom

• three copper atoms

Tags

NGSS.MS-PS1-1

In the late 1700s, Antoine Lavoisier performed a series of experiments to find out what happened when a substance burned. In each experiment, he observed that the weight of a container and its contents was the same at the end of the experiment as it had been in the beginning. These observations led him to propose the law of

• combustion.

• fixed proportions.

• conservation of mass

• conservation of energy.

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A scientist studies the following chemical equation for the production of water.

What happens to the mass of the reactants during this chemical reaction?

• mass of oxygen stays the same

• mass of hydrogen doubles

• mass of oxygen decreases

• mass of hydrogen increases

Tags

NGSS.MS-PS1-5

The chemical equation below shows the amount of the reactants used and the amount of only one of the products formed.

How much water should be formed in this chemical reaction?

• 5g

• 9g

• 27g

• 31g

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

The diagram represents the chemical reaction that occurs when propane combusts.

In the reaction, for every molecule of propane, how many molecules of oxygen are used?

• 1

• 3

• 4

• 5

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2