Topic 1: 7th Grade Matter and Solutions

Fill in the Blanks

$\left(NH_4\right)_2Cr_2O_7$  

How many elements make up this chemical formula?

Fill in the Blanks

$C_6H_{12}O_6$  

How many elements make up this chemical formula?

Fill in the Blanks

How many atoms of magnesium are in Mg(OH)₂?

Multiple Select

What elements are in this compound?

• Carbon

• Hydrogen

• Oxygen

• Calcium

• Cobalt

Multiple Choice

Which elements are in the formula shown above?

• Cobalt only

• Carbon and Oxygen

• Copper only

• Carbon and Osmium

Multiple Choice

In salt water, which is the solute and which is the solvent?

• Salt is the solute, water is the solvent

• Water is the solute, salt is the solvent

• Both are solutes

• Both are solvents

Multiple Choice

In which beaker does salt dissolves faster?

• Hot water

• Room temperature

• Ice watet

Multiple Choice

Which of the following factors does NOT affect the rate of dissolution of a solute in a solvent?

• Temperature

• Stirring

• Color of the solute

• Surface area of the solute

Multiple Choice

How does stirring affect the rate of dissolution of a solute in a solvent?

• Stirring decreases the rate of dissolution

• Stirring has no effect on the rate of dissolution

• Stirring increases the rate of dissolution

• Stirring makes the solution colder

Multiple Choice

If you have a solution with a high concentration of solute, what can you do to increase the amount of solute that dissolves?

• Decrease the temperature

• Add more solvent

• Stop stirring

• Use a smaller container

Categorize

Options (3)

temperature

type of fish

fishing pole

Ms. Stull's science class is collecting data to see if the type of fish caught during a fishing trip is affected by the temperature. Identify the variables.

Independent

Dependent

Control

Multiple Choice

What are the three kinds of variables that you need to identify in your experiments?

• independent, controlled, dependent
• independent, dependent, identical
• identical, controlled, sample

Multiple Choice

What is the independent variable (cause) in this experiment?

"Will fish school or group together more if a predator is present?"

• whether there is a predator or not

• number of fish school together

• type of predator

• type of fish

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident