Grade 7 Science SC Unit 2: Nature of Matter

During a science project, Oliver, Elijah, and Henry were discussing the nature of water. Oliver mentioned that a water molecule is made up of one oxygen and two hydrogen atoms. Henry then asked, 'Why is water considered a pure substance?'

• Elijah replied, 'Each water molecule has an identical composition and properties.'

• Oliver suggested, 'Water can be combined with other substances by physical means.'

• Henry thought, 'Water molecules are made up of different types of atoms.'

• Elijah said, 'Water cannot be broken down by physical means.'

Tags

NGSS.MS-PS1-1

During a beach trip, Aiden, Anika, and Priya collected sand, pebbles, and sea water in a bucket. If they can see the different components in the bucket, it is a

• Solution

• Compound

• Homogeneous mixture

• Heterogeneous mixture

Aria, Hannah, and James were working on a science project in their school's chemistry lab. They decided to combine two or more elements in a specific way to create a new substance. What is this newly created substance called?

• Element

• Compound

• Mixture

• Solution

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

Avery, David, and Lily were helping Ali prepare a fruit punch for a party. They were curious about the nature of the ingredients they were using. Which of the following statements is true?

• The Pepsi they added is a heterogeneous mixture.

• The milk they poured in is a pure substance, not a mixture.

• The cranberry juice they used is a homogeneous mixture.

• The oatmeal with raisins they prepared for breakfast is a homogeneous mixture.

On a hot summer day, Charlotte, Noah, and Oliver decided to make lemonade. They completely dissolved salt in the water to add a bit of flavor. How would you classify the substance they created?

• As a pure substance.

• As a salt suspension.

• As a homogeneous mixture.

• As a heterogeneous mixture.

Rohan, Abigail, and Luna were observing Austin as he was preparing his morning coffee by boiling water. Which of the following statements best describes the action of water particles in Austin's kettle as the water was being heated?

• The cooler water particles were moving at a slow rate until the increased temperature caused an increase in particle motion.

• The cooler water particles were moving at a high rate until an increased temperature caused a decrease in particle motion.

• The cooler water particles were moving at a slow rate until the decreased temperature caused an increase in particle motion.

• The cooler water particles were moving at the same rate until the increased temperature caused a decrease in particle motion.

Tags

NGSS.MS-PS1-4

Olivia, Luna, and Avery are working on a science experiment for their school project. They discovered that they can use both filters and magnets to separate which of the following?

• Compounds in a chemical solution

• Elements in a periodic table

• Components in a mixture of iron filings and sand

• Gases in the air

Samuel, Maya, Aiden, Bryce, Camine, Evelyn, Essence, and Abby are working on a science project about the properties of gases in their school's science lab. They conducted several experiments and made some observations. Which of the following observations made by them is not true about gases?

• Bryce noticed that when he opened a perfume bottle, the fragrance spread out to fill the room.

• Camine observed that when he released air from a balloon, the particles of gases moved very quickly.

• Evelyn stated that when she opened a soda can, the particles of gases moved very slowly.

• Essence, Abby and Samuel found that when they inflated a balloon, it showed that gases have an indefinite volume.

Tags

NGSS.MS-PS1-4

Grace, Noah, and Nora were preparing a lemonade stand for their neighborhood block party. They combined lemon juice, sugar, and water in a large pitcher. The resulting mixture was uniform throughout. What is this type of mixture called? (minus the lemons)

• Atom

• Compound

• Homogeneous mixture

• Heterogeneous mixture

During a science project, Arjun, Abigail, and Liam were observing a bottle of syrup. They noticed that the particles in the syrup were closely packed and could slide past each other. Which state of matter were they observing?

• Solid

• Liquid

• Gas

• Plasma

Tags

NGSS.MS-PS1-4