Science Eoy Review

You have looked through a microscope at a slide containing microscopic protozoa. You counted the following different types of protozoa on your slide. Using the table below which graph correctly records these counts:

• 
• 
• 
• 

The title of an experiment is: "The Number of Wire Turns Affects the Number of Nails an Electromagnet Will Pick Up." From the table below, which option shows the correct independent and dependent variable for this experiment?

• Option 1

• Option 2

• Option 3

• Option 4

When ammonium chloride (NH₄Cl) mixes with water it absorbs thermal energy. Mrs. Apsche's science class used the chemical to design a cold pack. They added different amounts of NH₄Cl to 100mL of water at 50 degrees C and measured its temperature one minute after reaction. The data they collected is shown in the table below. Which is of the following conclusions is best supported by the data?

• Ammonium chloride is not a good endothermic reactant.

• Temperature is independent of the amount of NH₄Cl

• 3.0 grams of NH₄Cl would make the best cold pack.

• Water temperature was a constant in each trial.

Which statement is best supported by this graph?

• A disease of cardinals spread throughout the park.

• Dominant cardinal chicks were the first to be fed.

• The population of cardinal predators increased.

• The cardinals' food supply increased.

Kayla made seven pendulums. Each pendulum had the same length string but different weights at the end. She used a stopwatch to record the time it took each pendulum to complete ten swings. Her data are shown in the table below. What is the most logical conclusion from Kayla's results?

• The time it takes for a pendulum to complete ten swings increases as the weight increases.

• The weight did not significantly affect the time it took each pendulum to complete ten swings.

• Because the data do not form a predictable pattern, Kayla must have done the experiment wrong.

• The time it takes for a pendulum to swing is affected by the length of the pendulum, not its weight.

Using the table below, which of the following describes the relationship between grams of solute and boiling point?

• As grams of solute increase, boiling point decreases.

• As grams of solute increase, boiling point increases

• As grams of solute decrease, boiling point decreases

• As grams of solute decrease, boiling point remains stable.

A student wants to conduct an experiment on how particle size affects the length of time needed for solids to dissolve in liquids. He tests different types of sugar, each with differently-sized crystals, by timing how long it takes each one to dissolve in water at room temperature. Using the data in the table, what could the student conclude about this experiment?

• Solids with larger particles dissolve faster in liquids.

• Solids with smaller particles dissolve faster in liquids

• Solids with smaller particles do not dissolve in liquids.

• There is no relationship between particle size and how solids dissolve in liquids.

Knowing that breathing rate and pulse rate are related, what conclusion can you make from the following table?

• The more demanding the activity is, the higher the pulse rate will be.

• There is no direct relationship between breathing rate and type of activity.

• There is an inverse relationship between pulse rate and type of activity.

• The resting pulse rate is always one third that of the active pulse rate.

Use this information to answer this question. This graph shows how the temperature changed in five pieces of wood painted different colors after they were all exposed to the sun for one hour. What color would you paint a surface that you wanted to absorb as much solar heat as possible?

• Black

• Red

• Silver

• Yellow

Which of these stars is farthest away from the sun?

• Sirius

• Canopus

• Antares

• Centauri