dissolving
law of conservation of matter
Around the world
the spheres of Earth
water cycle/phase changes
100
dissolving occurs when molecules ________ mix together
evenly
100
what does the law of conservation of matter state?
matter cannot be created or destroyed
100
what is the definition of down?
towards the center of the Earth
100
hydrosphere
water
100
when a solid turns to a liquid it is called
melting
200
why will food dye dissolve in hot water?
the water and food coloring are made of molecules that are evenly mixing over time.
200
What happens to the mass (weight) of a substance when it undergoes a phase change?
The mass or weight will stay the same
200
why does the sun look so bright even if it isn't the brightest star in space?
the sun is the closest star to Earth.
200
biosphere
living things
200
what are the 3 phase changes in the water cycle?
evaporation, condensation, precipitation
300
Do molecules disappear in dissolving?
No, they are evenly mixing together, causing it to look like it is dissolving
300
What happens to the mass or weight of a chemical reaction after the reaction has occurred.
the mass will stay the same overtime because the law of conservation of matter states that matter cannot be created or destroyed.
300
why do airplanes look so small when they are in the sky even though they are actually very big.
the airplane is farther away. When things are farther they will look smaller.
300
atmosphere
gases/air
300
when a liquid gets heated up and turns into a gas (use your hand signals if you forget)
evaporation
400
in dissolving, why does it look like the different substances disappeared?
The molecules have high attraction and are evenly mixing together, causing the substance to look like it is disappearing.
400
what will be the mass of 10g icecube after it has melted (solid --> liquid)
10g (matter cannot be created or destroyed)
400
what causes sunrise and sunset throughout the day
the Earth's rotation on its axis.
400
geosphere
land and rocks
400
what is it called when a gas gets cold and turns to a liquid (use your hand signals if you don't remember)
condensation
500
Which of the following shows molecules dissolving?
C.
500
Ms.Parmett decided to see what happens to the mass of an object when it is frozen. She puts a 250g bag of liquid water into the freezer. How much will it weigh after it is frozen? Explain using the law of conservation of matter.
the bag will way 250g because the law of conservation of matter states that matter cannot be created or destroyed.
500
what causes the position of the length of shadows to change throughout the day?
The Earth's rotation on it's axis
500
What spheres are interacting in this example:
water evaporating from the ocean and condensing into clouds
the hydrosphere and the atmosphere
500
label the water cycle
evaporation
condensation
precipitation
runoff