Unit 1 Matter Common Assessment

What is the 2 called in the product of the balanced equation below? H₂ + Cl₂ = 2HCl

• subscript

• coefficient

• atomic number

• atomic mass

Which chemical equation supports the law of conservation of matter?

• H₂O₂ → H₂O + O₂

• 2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₃

• SO₄ + O₂ + 2 H₂O → 4 H₂SO₄

• Mg + 2 HCl → MgCl₂ + H₂

Tags

NGSS.MS-PS1-5

Which chemical equation shows a chemical reaction where mass is conserved?

• FeS + HCl → FeCl₂ + H₂S

• 2Cu₂O + C → 4Cu + CO₂

• Fe₂O₃ + C → Fe + CO₂

• Fe + H₂SO₄ → FeSO₄ + 2H₂

Tags

NGSS.MS-PS1-5

There are many gases in our atmosphere. Which gas is made by combining two different elements?

• oxygen

• nitrogen

• methane

• helium

Tags

NGSS.MS-PS1-1

Which example is a physical change?

• burning paper

• boiling water

• rotting vegetables

• rusting iron fence

Which activity is a chemical change for metal wire?

• bending a piece of metal wire

• coiling of a piece of metal wire

• rusting of a piece of metal wire

• cutting a piece of metal wire

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

During an experiment, a student placed a cube of solid baking soda in a glass dish. He added 10 drops of vinegar to the baking soda and recorded his observations.

1. Bubbles formed.

2. The dish became slightly colder.

3. The shape of the cube changed.

What type of change happened in the glass dish, and why?

• a physical change as bubbles were formed

• a physical change as the temperature decreased

• a chemical change as the shape of the cube changed

• a chemical change as the temperature changed and a gas was released

Tags

NGSS.MS-PS1-2

Examine the chemical equation. Which substance(s) is (are) broken apart?

• N₂O

• NH₄NO₃

• N₂O and H₂O

• NH₄NO₃ and H₂O

Tags

NGSS.MS-PS1-5

NGSS.MS-PS1-2

A student mixes 8 grams of chemical A with 6 grams of mixture B in a closed container. The chemicals react completely, and the products are formed. According to the Law of Conservation of Mass, what should be the mass of the products formed?

• 2 grams

• 6 grams

• 8 grams

• 14 grams

Tags

NGSS.MS-PS1-5

Which equation demonstrates the Law of Conservation of Matter during the formation of water?

• 2H₂ + O₂ → 2H₂O

• 2H₂ + 2O₂ → 2H₂O

• H₂ + O₂ → H₂O

• 4H₂ + O₂ → 4H₂O

Tags

NGSS.MS-PS1-5