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Density & Matter

100

What is the formula for density?

Answer: Density = Mass ÷ Volume

200

What state of matter has a definite shape and volume?

Answer: Solid

300

Is melting butter a physical or chemical change?

Answer: Physical change

400

Explain what happens to density if mass increases but volume stays the same.

Answer: Density increases

500

What is the independent variable in an experiment?

Answer: The variable you change

Periodic Table & Elements

100

What is the symbol for sodium?

Answer: Na

200

Which element has 3 protons?

Answer: Lithium

300

An atom has 8 protons, 8 neutrons, and 8 electrons. What element is it?

Answer: Oxygen (O) 

400

 Classify these elements as metal, nonmetal, or metalloid:

• Silicon (Si)
• Chlorine (Cl)
• Iron (Fe)

Answer: 

Silicon = metalloid

Chlorine = nonmetal

Iron = metal 

500

Name the element with:

• Atomic number 6
• 7 neutrons
• 6 electrons

Answer: Carbon 

Decimal Operations & Rational Numbers

100

Add: 12.36 + 7.489  

Answer: 19.849 

200

Order these numbers from least to greatest: 12.5, 12.49, 12.505, 12.495

Answer: 12.49, 12.495, 12.5, 12.505 

300

Multiply: 3.25 × 0.48

Answer: 1.56 

400

Solve: 15.75 − 6.48 + 2.34 

Answer: 11.61 

500

Classify: -7.25, 0, 8.6, 3/4 

Answer: integer & rational; 0 = whole, integer, & rational; 8.6 = rational; 3/4 = rational 

Fractions & Number Conversion

100

Convert 64/3 to a mixed number

Answer: 21 1/3 

200

Convert the improper fraction 17/5 into a mixed number.  

Answer: 3 2/5 

300

Add and simplify: 3/4 + 5/6

Answer: 1 7/12 

400

Solve: 

9/12 − 5/8

 

Answer: 1/8 

500

Solve:

 2 1/4 + 3 2/3

Answer: 5  11/12 

Russian Roulette

100

A student has 3.2 kg of liquid with a volume of 0.8 mL. Calculate its density.

Answer: 4 kg/mL

200

In an experiment, a student changes the amount of sunlight a plant receives and measures its growth.

• What is the independent variable?
• What is the dependent variable?

Answer:
Independent = sunlight
Dependent = plant growth

300

An object has a mass of 0.45 kg and a volume of 250 cm³.

• Convert the mass to grams and the volume to milliliters.
• Then calculate its density in g/mL.
  (Hint: 1 kg = 1000 g, 1 cm³ = 1 mL)

Step 1: Mass conversion: 0.45 kg × 1000 = 450 g
Step 2: Volume conversion: 250 cm³ = 250 mL
Step 3: Density = Mass ÷ Volume = 450 ÷ 250 = 1.8 g/mL 

Answer: 1.8 g/mL

400

A student bought 3.75 meters of ribbon, then 2.6 meters more, and used 1.25 meters for a project.

• How much ribbon is left?
• Round your answer to the nearest tenth.

Answer:
3.75 + 2.6 = 6.35
6.35 − 1.25 = 5.1
Rounded to nearest tenth = 5.1 meters

500

Classify these elements as metal, nonmetal, or metalloid:

• Boron (B)
• Sulfur (S)
• Aluminum (Al)

Answer:
Boron = metalloid
Sulfur = nonmetal
Aluminum = metal