Mixtures and Solutions
What do we call a combination of two or more substances that keep their own properties (for example: soil or a mud puddle)?
Mixture
When matter gets hotter and changes from a solid to a liquid, what is that change called?
Melting
What two things must matter always have, according to the standard definition?
Mass and Volume
What do we call the very small particles that make up all matter and are too small to see?
Atoms
Define "mass"
Mass is the amount of matter in an object.
Give one everyday example of a solution where a substance is uniformly dissolved in a liquid.
Examples: sugar water, salt water, soda, tea (any correct example)
When a liquid turns into a gas because of heating, what is that process called?
Evaporation
Is color considered a physical property or chemical property? Give a one-word answer and a short reason.
Physical property
True or False: Atoms can be seen with just our eyes.
False
What does the word "solution" mean in the context of matter?
A solution is a mixture where one substance is uniformly dissolved in a liquid.
Is sand mixed into water that settles to the bottom after a while a mixture or a solution? Explain in one sentence.
Mixture (because sand does not dissolve; it settles)
As temperature decreases, matter often changes from a gas to a liquid to a solid. Give an everyday example of this happening.
Water vapor in the air forms liquid droplets (dew) and then ice (frost) in cold weather; or water → ice in a freezer.
Is color considered a physical property or chemical property? Give a one-word answer and a short reason.
Shape/volume demonstration; best answer: mass of sponge material stays the same — demonstrates mass is conserved while shape/size can change.
List one real-world example that shows matter is made of particles
blowing up a balloon, compressing air in a syringe, dissolving sugar in water.
What is a "mixture"
A mixture is when two or more substances are combined but keep their own identifying characteristics.
Name two examples from the list below that are mixtures: salt water, concrete, sugar water, soil.
Concrete and soil (salt water and sugar water are solutions)
True or False: Matter gains or loses mass when it changes from a solid to a liquid. (Answer with True or False and one-sentence explanation.)
False — Matter does not gain or lose mass during phase changes.
Which property tells us how much space an object takes up? Use the exact word from the standard.
Volume
Where are electrons located in an atom?
What is the Electron cloud/shell
In your own words, explain the difference between "mass" and "weight" in one or two sentences.
Mass is the amount of matter in an object; weight is the force of gravity on that mass
Describe in one sentence how you could separate a simple mixture of sand and water (what physical method would you use?).
Example answer: Use a strainer or sieve to separate sand from water, or let sand settle and pour off the water.
If you melt an ice cube and then let the water evaporate, will the total mass of the water/ice change? Answer with Yes or No and one-sentence explanation
No — The mass stays the same during phase changes
A metal ball and a wooden ball are the same size, but the metal ball is heavier. Which physical property explains this difference? Use a short phrase.
Density
Explain how dissolving sugar in water gives evidence that matter is made of tiny particles
Sugar dissolves because its particles spread out among the water particles; the sugar seems to disappear but is still there at the particle level — this shows matter is made of tiny particles.
Use the words "matter," "mass," and "volume" each in a short sentence
Example sentences: "Matter is anything that has mass and takes up space." "The mass of the rock is 200 grams." "The volume of the water is 1 liter."