Measurements and Classification of Matter Review 2024-2025 BONUS

Convert 25. kJ into J.

• 0.0025 kJ
• 2500. kJ
• 0.250 kJ
• 25000. kJ
• 0.0250 kJ

How many significant figures are in the measurement 0.010500 g? (type the actual number)

• 5
• 1
• 2
• 3
• 4

A student calculates the density for a sample of sulfur to be 2.15 g/cm³. What is the percent error in the student's measurement?

• 0.15%
• 0.070%
• 0.075%
• 6.97%
• 7.50%

A student measured the density for an aluminum cube to be 2.97 g/cm³. What is the student's percent error?

• 10%
• 20%
• 30%
• 40%
• 50%

What is 0.002122 written in scientific notation?

• 2.122 x 10⁻³
• 2.122 x 10³
• 21.22 x 10⁻⁴
• 0.2122 x 10⁻³

Round 300500.02 to three significant figures (hint: this needs to be written in scientific notation)

• 3.0 x 10⁵
• 3.00 x 10⁵
• 3.01 x 10⁵
• 3.005 x 10⁵

Given the diagram representing a classification of matter, which types of matter are represented by X and Y in the diagram?

• X is mixture, and Y is substance.
• X is substance, and Y is mixture.
• X is element, and Y is compound.
• X is compound, and Y is element.

Which particle diagram could represent a diatomic element?

• 
• 
• 
• 

Which of the following substances can be further broken down by chemical means?

• Al
• Co
• Na
• CO

Which particle diagram represents a sample of matter that can not be broken down by chemical means?

• A
• B
• C
• D