Chemical reactions review

In the diagram, letter D represents a

• subscript

• coefficient

• product

• equation

In the diagram, letter E represents a

• subscript

• coefficient

• product

• equation

Which are the reactants in the equation shown?

• H₂O and CO₂
• O₂ and CH₄

Which is the product in the reaction shown?

• Al₂O₃

• Al

• O₂

What describes the reactant atoms in the equation shown?

• Al= 4, O= 3
• Al= 1, O= 1
• Al= 4, O= 6
• Al= 6, O= 1

How does the mass of products compare to the mass of reactants in a chemical reaction?

• reactants = products

• reactants > products

• reactants < products

In the reaction shown below, 12 grams of AB break down into 8 grams of product A and an unknown amount of product B.

Using the law of conservation of mass, what will the mass of product B be?

• 4 grams

• 8 grams

• 12 grams

• 20 grams

How many Sodium (Na) are in 6NaCl?

• 1
• 12
• 6

How many elements are in C₆H₁₂O₆?

• 1
• 3
• 12
• 24

Which of the following is a sign that a chemical reaction has occurred?

• change in shape
• melting
• formation of a gas
• dissolving