Understanding Chemical Reactions and Equations

Understanding Chemical Reactions and Equations

Assessment

Interactive Video

Chemistry

9th - 10th Grade

Hard

Created by

Jennifer Brown

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What are the starting substances in a chemical reaction called?

Catalysts

Reactants

Inhibitors

Products

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of a chemical equation?

To show the physical state of substances

To represent the energy change in a reaction

To depict the molecules before and after a reaction

To measure the temperature change in a reaction

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the significance of the plus sign in a chemical equation?

It indicates a reversible reaction

It separates different reactants or products

It represents the energy change

It shows the direction of the reaction

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What do coefficients in a chemical equation represent?

The speed of the reaction

The energy required for the reaction

The number of molecules involved

The temperature at which the reaction occurs

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the law of conservation of mass state?

Mass is lost during a chemical reaction

Mass is gained during a chemical reaction

Mass is irrelevant in a chemical reaction

Mass remains constant during a chemical reaction

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is conserved during a chemical reaction according to the video?

The temperature

The volume of reactants

The number of atoms

The number of molecules

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can we balance the number of oxygen atoms in the reaction of H2 and O2 forming H2O?

By removing H2 molecules

By adding more O2 molecules

By changing the formula of water

By doubling the number of H2O molecules

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