WorksheetsGrade 7 Science SC Unit 2: Nature of Matter
Total questions: 23
Worksheet time: 13mins
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.'
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
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.
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.
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
During a cooking class, Aiden, Daniel, and Ethan observed that the particles in a heated pot of soup were constantly _. What does this observation align with in the kinetic molecular theory of matter?
Growing
Contracting
Reacting
Moving
During a cooking class, Michael was making a lemonade for Abigail and Zoe. He was mixing sugar into water. In this scenario, what would we call the sugar?
Solute
Solvent
Solution
Solubility
On a hot summer day, Daniel, Michael, and Kai were having a discussion. Which of the following situations they discussed is an example of a phase change?
Michael splitting a log into pieces for the winter.
Kai adding food coloring to his drink.
Daniel tearing a piece of paper to make a paper plane.
Michael melting ice cubes in his drink.
During a science project, Scarlett, Harper and Aria are discussing about a hot cup of coffee. Scarlett says that the temperature of the coffee is a measure of its average heat, while Aria argues it's a measure of the coffee's average kinetic energy. Who is correct?
Scarlett
Aria
Both are correct
Neither are correct
During a science fair, Priya, Michael, and Abigail were given four samples: a block of ice (Solid), a bottle of water (Liquid), a balloon filled with air (Gas), and a neon light (Plasma). They were asked to identify the sample with the LOWEST level of kinetic energy as part of their project. Which sample should they choose?
Block of Ice (Solid)
Bottle of Water (Liquid)
Balloon filled with Air (Gas)
Neon Light (Plasma)
Isla and Liam were doing an experiment in their science class where they mixed sand and water. The result of their mixture is a suspension. This means their mixture has
A solute and a solvent
A sediment
A cloudy appearance
Oil in it
Anything that has mass and takes up space is
Noah, Emma, and Lily are working on a school project about the properties of water. They are boiling and freezing water to understand its characteristics at the same temperature. In their experiment, which of the following characteristics of water are the same temperature?
Boiling point and freezing point
Condensation point and melting point
Freezing point and condensation point
Melting point and freezing point
During a science fair, Liam, Evelyn and Mason were observing different experiments. They noticed that when Mason's ice cream started to melt under the sun, it absorbed heat from the surroundings. Which of the following changes, similar to Mason's ice cream melting, is an endothermic change?
Melting
Freezing
Condensing
Sublimating
Isla, Aiden, and Scarlett are in a chemistry class. Isla believes that elements and compounds are considered pure substances, while Aiden thinks that homogenous and heterogeneous mixtures are also pure substances. Scarlett, unsure, decides to ask the class. Which of the following would you consider as pure substances? Select all that apply.
Elements (Isla's belief)
Compounds (Isla's belief)
Homogenous mixtures (Aiden's belief)
Heterogeneous mixtures (Aiden's belief)
During a science fair, Benjamin, Abigail, and Rohan are discussing their projects. Benjamin believes that mass is the distance between two points in his model. Abigail, on the other hand, argues that mass is the amount of clay (stuff) used in her sculpture. Rohan, who is listening to their conversation, thinks that mass is the amount of space his project takes up on the table. David, another participant, thinks that mass is the speed of particles in his liquid experiment. Abby, a judge at the fair, believes that mass is the amount of matter (stuff) in an object. Who is correct?
Benjamin who thinks mass is the distance between two points.
Abigail who thinks mass is the amount of clay (stuff) used in her sculpture.
Rohan who thinks mass is the amount of space his project takes up on the table.
David who thinks mass is the speed of particles in his liquid experiment.
Abby who thinks mass is the amount of matter (stuff) in an object.
During a science class, Evelyn, Zoe, and Michael were conducting an experiment. They heated a substance and observed its changes. They noticed something happening to the substance between points D and E on their graph. What was happening to the substance at this stage?
Melting
Freezing
Vaporizing
Sublimating
During a school science fair, Oliver, Ava and Arjun observed that a piece of dry ice they were using in their project directly turned into gas without becoming a liquid. What is this phase change from solid to gas called?
Solid
Liquid
Gas
Plasma
