HC Ch 7 Review

What is a reactant in a chemical reaction?

• The new substance formed by a chemical reaction

• The starting substance of a chemical reaction

• The substance that speeds up a chemical reaction

• The substance that stops a chemical reaction

Tags

NGSS.MS-PS1-1

What is a product in a chemical reaction?

• The starting substance of a chemical reaction

• The substance that speeds up a chemical reaction

• The new substance formed by a chemical reaction

• The substance that stops a chemical reaction

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a balanced chemical equation?

• An equation with more reactants than products

• An equation with more products than reactants

• An equation with the same number of each type of atom on both sides

• An equation with different numbers of atoms on each side

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the symbol (s) represent in a chemical equation?

• Solid

• Liquid

• Gas

• Aqueous solution

What does the symbol (aq) represent in a chemical equation?

• Solid

• Liquid

• Gas

• Dissolved in water

What is one of the signals that a chemical reaction has occurred?

• No change in color

• Solid formation

• No change in temperature

• No change in state

Tags

NGSS.MS-PS1-2

What must be checked to ensure a chemical equation is balanced?

• The color of the reactants

• The state of matter

• The number of atoms on both sides

• The temperature of the reaction

Tags

NGSS.MS-PS1-5

What does a balanced chemical equation ensure?

• Energy will transfer from reactants to products

• Equal volume of reactants and products

• Equal number of molecules

• Equal number of atoms of each type

Tags

NGSS.MS-PS1-5

What is not a part of the systematic approach to balancing equations?

• Writing unbalanced equations

• Changing subscripts

• Balancing by trial and error

• Checking atom balance

Tags

NGSS.HS-PS1-7

Why is it important to balance chemical equations?

• To satisfy the law of conservation of mass

• To make the equation look neat

• To change the properties of reactants

• To increase the reaction speed

Tags

NGSS.MS-PS1-5