Which state of matter (see drawing) has the most energetic/ fastest moving particles?
Gas
When iron rusts, this is an example of a ____ change
chemical change
Thanos is studying the properties of the infinity gems and he recorded his observations in a table. Which infinity gems are soluble in water?
Space Gem and Reality Gem (those that disappear in water)
Plants absorb 3 things (sunlight, carbon dioxide, and water) and change them into plant food (sugars). This change is a physical or chemical change?
Chemical change
Complete the quote related to states of matter: "Put __ in a cup, it becomes the cup. Put __ in a bottle, it becomes the bottle. Now, __ can flow or it can crash. Be __, my friend."
water (if you answer liquid, it's OK)
Does adding salt make water boil faster? In this experiment, the amount of water used is which type of variable?
Controlled variable
Bending a paper clip is an example of a physical or chemical change?
Physical change
Which state of matter has the least moving particles?
Solid
When sweat evaporates, our body cools down. But why do we feel hotter in room with no fans or windows versus a room with fans or windows? (Note: temp is still the same)
If there is no air movement, sweat takes longer to evaporate! If sweat does not evaporate, we feel hot
The particles of a substance added to water looked like this. Did the substance dissolve? Why?
It's insoluble - the particles did not spread out to the other areass
Does colored water evaporate faster then clear water? In this experiment, the color of the water is what type of variable?
Independent variable
Does hair cream make our hair grow faster? Lisa experimented on herself. She measured her hair growth without hair cream, then she used hair cream and measured hair growth again. What's the indep. variable?
Using hair cream
3 syringes (see pic) are filled with a solid, liquid, and gas. Which syringe will be the hardest to press/ push down?
Syringe filled with a solid
Cooking popcorn is an example of a physical or chemical change?
Chemical change
A viral video from 2019 showed a boy sitting calmly in boiling water. Is the water really boiling? Why/Why not?
This is fake news! If the water is boiling, where are the bubbles? where's the steam? The bubbles should make the surface of the water chaotic, not calm
Lighting a firecracker is an example of a physical or chemical change?
Chemical change
In which object will 15 mL of water evaporate the fastest?
Petri dish
Describe what happens when salt water evaporates
Salt is left behind
Which setup will dissolve salt the slowest?
Setup 1
Frost can form on plants by deposition. The water vapor changes into ice directly, without turning into liquid first. This is an example of physical or chemical change?
Physical change! All changes in state are physical changes!
True or False: During boiling, the bubbles are empty spaces only; they do not contain anything
False - bubbles have water vapor inside
When dry ice sublimates, it turns from solid into gas. This is an example of a physical or chemical change?
Physical change! All changes in state are physical changes!
Does colored water evaporate faster then clear water? In this experiment, which type of variable would the "time it takes the water to evaporate" be?
Dependent variable
Does adding salt make water boil faster? In this experiment, the amount of salt used is which type of variable?
independent variable
Choose the best words: When a solid melts, there is an (increase/ decrease) in energy, and the particles move (faster/ slower)
There is an INCREASE in energy, and particles move FASTER
Give 2 variables to control in this experiment: Which brand of paper towel absorbs the most water?
Size of paper towel used; type of liquid for absorption; temp of liquid; surface where liquid is poured; how the paper towel is used
Breaking a cookie is a physical or chemical change?
Physical change
Heat expansion - when an iron bar is heated, it's length increases. Which picture (A or B) demonstrates heat expansion?
Picture A. Distance between particles increase when matter is heated
Dissolving salt into water is an example of a physical or chemical change?
Physical change
3 syringes (see pic) are filled with a solid, liquid, and gas. Which syringe will be the easiest to press/ push down?
Syringe filled with a gas
Which two states of matter in the drawing have fixed VOLUME? (Hint: volume measured in liters)
solid and liquid