Chemistry -- 8th Grade Science Review

Which statement best describes evidence that a chemical reaction occurs as a cake bakes?

• The water in the cake batter evaporates.

• The cake rises as gas bubbles form in the baking cake.

• The cake takes the shape of the container in which it is baked;

• The water in the cake batter is used to keep the cake moist as it bakes.

Tags

NGSS.MS-PS1-2

Which of the following best describes a physical change?

• Wood changes color as it burns.

• A solid forms from two liquids.

• Bubbles form in boiling water.

• A matchstick burning.

How many atoms of Oxygen are in the chemical formula for glucose C₆H₁₂O₆ ?

• 6

• 12

• 18

• 24

Tags

NGSS.MS-PS1-1

How many elements are in the chemical formula CH₃CO₂?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

A chemical formula shows all of the following except....

• the chemical symbols of the element

• the number of atoms of each element

• the elements found in a compound

• the number of protons in a nucleus

Tags

NGSS.MS-PS1-1

What is the term for the number 8 in the following chemical formula 2C₈H₁₈ ?

• Reactant

• Product

• Coefficient

• Subscript

All of the following are evidence of a chemical reaction except....

• Production of a gas

• Formation of a precipitate

• Change in the shape of the matter

• Change in the temperature of the matter

Tags

NGSS.MS-PS1-2

All of the following are examples of a chemical compound except....

• MgO

• O₂

• C₈H₁₈

• HCl

Tags

NGSS.MS-PS1-1

All of the following are examples of elements except...

• Cu

• Cl

• CO

• He

What is the appropriate subscript for hydrogen?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1