Lab Science 8 Midterm 2023

This scientist discovered that some elements are radioactive and emit electrons.

• Rosalind Franklin
• Dorothy Hodgkin
• Marie Curie

What is the charge of an atom that has gained 2 electrons?

• +2
• 0
• -2

What is the overall charge of this atom?

• +2
• 8
• -2

Isaac wanted to find out if there was a relationship between the month of the year and the number of bikes sold at a local bike shop. He created the following line graph to record his results. What is the dependent, or observed variable, in Isaac's experiment?

• The month
• The number of bikes sold

Matt wants to track how many basketball games BEA wins each month of the season from December to April. What types of graph would work best for Matt to record his data? This type of graph works best to show changes over time.

• Circle Graph
• Line Graph
• Bar Graph

Presley was running away from Morgan Wallen's bodyguards after a concert. She ran a total of 2,500 meters. How many Kilometers did Presley run?

• 1,250 Kilometers
• 2.5 kilometers
• 250 kilometers.

James and Luke are lifting weights at the gym. Luke can bench 30 kg. James can bench the same amount of weight as Luke. How many grams of weight can James bench?

• 300 g
• 30,000 g
• 30 mg

Alex tested three different brands of tires for his dirt bike to determine which brand lasts the longest. What is the independent variable?

• Brand of tires
• Type of dirt bike
• How long the tires last

If a box of paperclips weighs 20 grams and has a volume 5 milliliters, what is the box's density?

• 20 mol
• 5 g/mL
• 4 g/mL

What is the atomic number of Strontium?

• 38
• 87
• 88
• 50