Elements, Compounds and Solutions

A student wanted to conduct an experiment to see if temperature affected the time it takes for sugar to dissolve in water. Which is the BEST hypothesis for this experiment?

• Will sugar dissolve in cold water?

• A thermometer can show the temperature of sugar and water.

• Sugar will dissolve faster in hot water than in cold water.

• How much sugar will dissolve in cold water compared to hot water?

Tags

NGSS.MS-PS1-4

Students used different amounts of salt and water to make four samples. They heated the same amount of each sample until it boiled. The table shows their results.

Which conclusion should be drawn from these results?

• Sample 4 contains the greatest amount of salt.

• Sample 3 contains more salt than sample 2.

• Sample 2 contains the same amount of salt than as Sample 4.

• Sample 4 contains the least amount of salt.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

A group of students is using items II, III, and IV. What task are they most likely performing?

• determining the density of a rock

• heating 100 mL of distilled water

• measuring the volume and temperature of a solution

• determining the miniscus of a liquid

Which of these substances when mixed together will form solutions?

Select two correct answers.

• sand and salt

• salt and water

• sand and water

• sugar and water

• sugar and salt

Which of the following contains the greatest number of elements?

• S₈

• HNO₂

• CH₄

• AlCl₃

Tags

NGSS.MS-PS1-1

The chemical formula for sulfuric acid is H₂SO₄. Which of the following statements accurately describe the atoms involved in the formula for sulfuric acid?

• There are twice as many sulfur (S) atoms as there are hydrogen (H) atoms.

• There are 6 total atoms involved in the chemical formula.

• There are 4 sulfur (S) atoms involved in the chemical formula.

• There are twice as many hydrogen (H) atoms as there are sulfur (S) atoms.

Tags

NGSS.MS-PS1-1

Select the processes that involve a physical change.

Select the processes that involve a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

The image shows the temperature of a liquid before and after a mystery substance was added during an experiment. There were no heating or cooling elements involved in the investigation. Which of the following statements is true?

• The experiment demonstrates a chemical change.

• The experiment demonstrates no change.

• The experiment demonstrates a phase change.

• The experiment demonstrates a physical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

The image shows the temperature of a liquid before and after a mystery substance was added during an experiment. There were no heating or cooling elements involved in the investigation. The experiment demonstrates a physical change. Which of the following statements is true?

• The mystery substance dissolved.

• The decrease in temperature is evidence of the change.

• The increase in temperature is evidence of the change.

• The substance remained unchanged.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4