Reactants and Products in Chemistry

Za'kyrian and Nataly are working on a chemistry project where they need to react hydrogen sulfide (H2S) with oxygen (O2) to produce sulfuric acid (H2SO4). If they have 1 mole of H2S, how many moles of O2 will they need to complete the reaction?

• a. 1 mol

• b. 2 mol

• c. 3 mol

• d. 4 mol

Tags

NGSS.MS-PS1-5

The changes that are visible during a chemical reaction are signs that the _______________________ in the reactants have been rearranged.

• atoms or neutrons

• nucleus

• protons

• reactant

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Balance this equation

N₂O₅ + H₂O --> HNO₃

• N₂O₅ + H₂O --> 2H₁NO₃

• N₂O₅ + H₂O--> 2HNO₃

• N₂O₆ + H₂O--> 2HNO₃

Tags

NGSS.MS-PS1-5

Balance the chemical equation

Fe(OH)₃ --> Fe₂O₃ + H₂O

• 1Fe (OH)₅--> Fe₂O₃ + 3H₂O

• 2Fe (OH)₃--> Fe₂O₃ + 3H₂O

• 2Fe (OH)₃--> Fe₁O₃ + 3H₂O

• 2Fe (OH)₃--> Fe₂O₃ + 3H₇O

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Is this equation balanced?

• Yes

• No

• Not enough information

Tags

NGSS.MS-PS1-5

What is the law of conservation of matter?

• Matter changes when reacted or changed.

• The mass of all reactants are changed during a physical or chemical change.

• The mass of the reactants is the same as the mass of the products.

• The mass of the products is different than the mass of the reactants.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the product(s) in the following chemical reaction: Chromium oxide + Carbon → Chromium + Carbon monoxide

• Chromium and carbon

• Chromium and carbon dioxide

• Chromium and carbon monoxide

• Chromium oxide and carbon

Tags

NGSS.MS-PS1-2

What is the purpose of the arrow sign in a chemical reaction?

• Making sure atom counts on each side are the different.

• Showing which substances were in the container first and which substances were added another time.

• Showing which substances are solids and which are liquids or gases.

• Separating reactants and products.

During a chemical reaction, __________.

• a small amount of matter is destroyed during the process

• the mass of the atoms of the product(s) is greater than that of the reactant(s)

• the number of atoms in the product(s) is less than that of the reactant(s)

• a new substance(s) is formed with the same number of atoms as the initial substance(s)

Tags

NGSS.MS-PS1-5

A substance with two gold (Au) atoms is combined with a substance with one gold (Au) atom to form one product. What is true of the product?

• There will be three gold atoms in the product.

• Some of the gold will evaporate into the air.

• There will be no gold in the product.

• There will be six gold atoms in the product.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5