2025 MRJH Test Review 1.2

​Test Review 1.2

MRJH 7th Grade Science

​Read the passage. Then answer the question. on the following slide:

Which statement best describes a physical change?

Which are examples of a physical change?

Multiple Choice

Which statement best describes a physical change?

• A change that alters (changes) the form or appearance of natter without creating a new substance.

• A change that produces a new substance with different properties.

• A change that cannot be reversed.

• A change that only occurs at high temperatures.

Multiple Select

Which of the following are examples of a physical change?

• Melting ice cube

• Melting wax

• A burning log turning into ash

• Sugar dissolving hot water

• Rust forming on a nail

​​Read the passage. Then answer the question on the following slide:

Which statement best describes a chemical change?

Which are examples of a chemical change?

Multiple Choice

Which statement best describes a chemical change?

• A change that alters (changes) the form or appearance of natter without creating a new substance.

• A change that produces a new substance with different properties.

• A change that can easily be reversed.

• A change that only occurs at high temperatures.

Multiple Select

Which of the following are examples of a chemical change?

• Melting ice cube

• Melting wax

• A burning log turning into ash

• Sugar dissolving hot water

• Rust forming on a nail

​Read the passage. Then answer the question on the following slide:

Which of the following correctly pairs a chemical change with the evidence of a chemical change?

Multiple Choice

Which of the following correctly pairs a chemical change with the evidence of a chemical change?

• A silver spoon tarnishing is evidenced by the formation of a dark substance on the spoon.

• Boiling water is evidenced by the formation of steam.

• Sugar dissolving in hot water is evidenced by the sugar disappearing.

• Wax melting in candle is evidence by a state of matter change.

Multiple Select

Based on the information from the reading passage, what are the signs that a chemical change has occurred?

• Change in color or odor

• Formation of a precipitate

• State of matter change (Solid melting into liquid)

• Formation of a gas

• Change in thermal energy

​Read the passage, then match the term to the correct definition on the following slide:

What is a solution?

What is a solute?

What is a solvent?

Match

Match the definition to the correct term.

• Solution

• Solute

• Solvent

A homogeneous combination of two or more substances

The substance that is dissolved in a solution

The substance that dissolves the solute

• A homogeneous combination of two or more substances

• The substance that is dissolved in a solution

• The substance that dissolves the solute

​Read the passage, then answer the question on the following page:

What is the difference between concentration and solution?

Multiple Choice

What is the difference between concentration and dilution?

• Concentration is the measure of how much solute is present in a solution, while dilution is the process of decreasing that concentration.
• Concentration is the process of increasing the amount of solute in a solution, while dilution is the measure of how much solute is present.

​Read the passage, then answer the question on the following page:

What are the factors that affect the rate of dissolution?

Multiple Select

What are the factors that affect the rate of dissolution?

• Temperature of the solvent

• Surface area of the solute

• Agitation by stirring or shaking a solution

• The price of the materials

​Counting Elements vs Counting Atoms

​When counting elements, count the number of capital letters in the chemical formula.

For example: NaOH has three capital letters and three elements (Na - Sodium, O - Oxygen, H - Hydrogen)


When counting atoms, count the numbers next to each chemical symbol in the chemical formula.
For example: NaOH has three total atoms.
Na - 1 atom of Sodium,
O - 1 atom of Oxygen,
H - 1 atom of Hydrogen

Multiple Choice

How many elements are in glucose? See the chemical formula below.

C₆H₁₂O₆

• 3

• 6

• 12

• 24

Multiple Choice

How many carbon are in glucose? See the chemical formula below.

C₆H₁₂O₆

• 3

• 6

• 12

• 24

Multiple Choice

How many hydrogen are in glucose? See the chemical formula below.

C₆H₁₂O₆

• 3

• 6

• 12

• 24

Multiple Choice

How many oxygen atoms are in glucose? See the chemical formula below.

C₆H₁₂O₆

• 3

• 6

• 12

• 24

Multiple Choice

How many total atoms are in glucose? See the chemical formula below.

C₆H₁₂O₆

• 3

• 6

• 12

• 24

​What is the difference between and element and compound?

Categorize

Options (16)

H (Hydrogen)

He (Helium)

Li (Lithium)

H2O (Water)

CO2 (Carbon Dioxide)

NaCl (Sodium Chloride)

C6H12O6 (Glucose)

Boiling Water

Dissolving Sugar in Water

Breaking Glass

Chopping Wood

C (Carbon)

Rusting of iron

Silver spoon tarnishing

Leaves changing colors

Candle burning the wick producing smoke

Place each example into the correct category.

Element

Compound

Physical Changes

Chemical Changes

Poll

Are you ready for CBA 1.2 on Friday September 12?

• Yes, because I studied my notes and paid attention in class!

• Yes, because I will study!