Chemical Formulas, Equations, and Reactions

Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

Tags

NGSS.MS-PS1-1

How many elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

• 2Mg and O₂

• 2MgO

• Mg and MgO

• O and MgO

Tags

NGSS.MS-PS1-2

Which is NOT an example of chemical change?

• production of gas.

• change in color.

• change in size.

• transfer of energy.

Tags

NGSS.MS-PS1-2

2H₂O + 2N → 4H + 2NO

The chemical symbols on the RIGHT (at the end of the equation) are called:

• products

• reactants

• yields/produces

How many atoms are represented in the reactants of this equation?

• 6

• 12

• 24

• 36

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following could be an organic compound? Hint: organic means it contains Carbon!

• NH₃

• H₂O

• CaCl₂

• CH₄

Tags

NGSS.MS-PS1-1

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

• CO₂ + H₂O --> C₆H₁₂O₆ + O₂

• C₆O + H₁₂O --> C₆H₁₂O₂

• CO₂ + H₂O --> C₆H₁₂O₆ + O₂

• CO₂ +H₂O --> C₆H₁₂O₆ +O₂

Tags

NGSS.MS-PS1-5

Which of the following pictures is an example of a chemical change?

• Wood burning in a fireplace

• ice melting in water in a beaker

• a cracked rock

• boiling water on a hotplate

Tags

NGSS.MS-PS1-2

Which of the following models best demonstrates a balanced chemical equation?

• F

• G

• H

• J

Tags

NGSS.MS-PS1-5