Chemical formulas and more...

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

• H₃SO₄
• HSO₄
• H₄S₃O
• H₂O

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-PS1-1

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

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-PS1-2

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

NGSS.MS-PS1-5

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

• A dark solid (precipitate) formed on the zinc metal.

• The zinc metal stayed silver-colored and shiny

• The CuSO₄ solution evaporated after the zinc metal was added.

• None of these

Tags

NGSS.MS-PS1-2

How is a physical change different from a chemical change?

• There is absolutely no difference
• Chemical changes produce a new substance, physical changes stay the same substance
• Chemical changes create and destroy matter, physical changes don't
• Physical changes create and destroy matter, chemical changes dont

A student listed how different parts of the body work to aid in the digestion of food.

Which of the following is a chemical change that occurs to the food?

• The food particles break into smaller pieces as food is chewed

• The movement of food to the stomach after food is swallowed

• The breakdown of molecules of food by enzymes and acid in the stomach to form new substances

• None of the above

Tags

NGSS.MS-LS1-7

How would you describe the overall charge of the nucleus in the atomic model?

• +9 (Positive Charge)

• +10 (Positive Charge)

• -9 (Negative Charge)

• No Charge

Tags

NGSS.MS-PS1-1

What Period would this atom be in?

• 6

• 4

• 2

• 10

Tags

NGSS.MS-PS1-1