Chemical Equations weekly Test

Iron and Oxygen gas react to form Iron Oxide, or rust. Which statement about the substances in this reaction is correct?

4Fe + 3O₂ → 2Fe₂O₃

• The mass of the Iron equals the mass of the Iron Oxide

• The mass of the Iron plus the mass of the Oxygen gas equal the mass of the Iron Oxide.

• The mass of the Iron Oxide is less than the total mass of the Iron and the Oxygen gas

• The mass of the Iron Oxide is more than the total mass of the Iron and the Oxygen gas

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

2Na + Cl₂ → 2 NaCl

55g + 7g → ?

What is the mass of the Products in this chemical reaction?

Tags

NGSS.MS-PS1-5

What does each circle or sphere in the diagram represent?

• An atom

• A compound

• A mixture

• A molecule

Tags

NGSS.MS-PS1-1

A balanced chemical equation showing how Methane (CH₄) and Oxygen (O₂) combine to form Carbon Dioxide (CO₂) and water (H₂O) is shown

CH₄ + 2O₂ → CO₂ + 2H₂O

Which statement about the substances involved in this reaction is correct?

• The total mass of the CO₂ and H₂O is less than the total mass of the methane and O₂

• Methane, Oxygen, and Carbon Dioxide do not have mass because they are gases

• The total mass of the methane and O₂ is less than the total mass of the CO₂ and H₂O

• A. The total mass of the methane and O₂ equal the total mass of the CO₂ and H₂O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The equation below shows how Lithium and water react to produce Lithium hydroxide (LiOH), a strong base.

2Li + 2H₂O → 2LiOH + H₂

What are the Products of this reaction?

• 2Li and H₂

• 2Li and 2H₂O

• 2LiOH and H₂

• 2H₂O and 2LiOH

Tags

NGSS.MS-PS1-2

A chemical reaction is shown

2Al₂O₃ → 4Al + 3O₂

? → 108g + 96g

What is the mass of the Reactants in this chemical reaction?

Tags

NGSS.MS-PS1-5

In which of these compounds are there twice as many Oxygen atoms as Hydrogen atoms?

• H₂SO₄

• H₂O

• H₃PO₄

• HClO₃

Tags

NGSS.MS-PS1-1

C₁₀H₁₂N₂O

Serotonin is a chemical substance that acts as a neurotransmitter. It helps relay messages in the human brain. The formula for one molecule of serotonin is shown. How many atoms in all are in a molecule of Serotonin?

Tags

NGSS.MS-PS1-1

. Two solutions are mixed and react to produce the solid precipitate AgCl. The chemical reaction is shown by the balanced chemical equation. The mass of some of the reactants and products are given in grams.

AgNO₃ + NaCl → AgCl + NaNO₃

    72 g    + ____ →   134 g  +  36 g

 

How many grams of Sodium Chloride were used in this reaction?

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Mg + O₂ → ?

The equation shows that Magnesium (Mg) can react chemically with Oxygen (O₂) to form a new substance. What is the new substance?

• Mg

• O

• MgO

• MnO

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2