Color
A tool that tells how heavy something is.
What is a scale or balance?
This process turns liquid water into an invisible gas.
What is evaporation?
When warm water in the air touches a cold surface, tiny drops form.
What is condensation?
Melting and freezing will cause a change in the–
weight
state of matter
chemical reaction
color
What is state of matter?
Physical or chemical characteristics of matter used to describe or identify a substance
Conservation of Matter
Conserved
Chemical Reaction
Properties
What is properties?
A crayon was left in a hot car for several sunny days. The crayon most likely–
melted and changed color
melted and changed shape
froze and changed shape
melted and lost mass
What is melted and changed shape?
Cooling causes particles to move like this.
What is slower and closer together?
Saved or used sparingly or wisely
Properties
Conserved
Weight
Matter
What is conserved?
Even when a solid melts into water, this stays constant.
What is mass?
The heaviness of an object; force of gravity on mass
What is weight?
A student heats something in a closed container. It looks different afterward, but the weight stays equal. What rule does this show?
What is matter stays the same even when it changes form?
You start with 200 mL of water and 5g of salt. After evaporation, how much solid remains?
What is 5 grams?
When lemon juice and baking soda are mixed, a chemical change occurs. When this happens, the mass–
What is decreases?
When you add heat to ice and cause it to melt, which of the following is true?
The ice cube loses some mass.
The ice cube gains more mass.
The mass of the ice cube stays the same.
The ice cube has no mass.
What is The mass of the ice cube stays the same?
Particular types of matter with specific properties
Conservation of Matter
Substance
Matter
Weight
What is substance?
A bucket holds 200 ounces of water. Rose adds 250 ounces of ice. After all the ice melts, what is the total mass of the mixture in the bucket?
What is 450 ounces?
Yoonchae's boba tea has 500 grams of liquid. She adds 6 grams of sugar but only 3 grams are dissolved completely. What is the mass of the contents inside the cup?
You see water beads on the outside of a cold lemonade glass, but none spilled. Explain why.
What is water vapor in the air cooled and turned to droplets?
Why does a bubbling tablet seem to “lose” mass on a scale?
What is gas left the container?
Heat causes ice to go through these two changes, in order.
What is melting, then evaporation?
You weigh a sealed container before and after a reaction. The weight is identical. Why?
What is no matter escaped so the total stayed the same?
When baking soda and vinegar are mixed, a gas is formed. This is known as a–
change from a gas to a liquid
change from a liquid to a solid
chemical reaction
melting
What is a chemical reaction?
After Gabriela’s debut, she drank a cup of ice water. When she touched the outside of the cup, she felt water droplets and thought the cup was leaking. But after checking carefully, she realized there was no leak. If the cup wasn’t leaking, where did the water droplets come from?
What is the water droplets formed from condensation — water vapor in the air cooled and changed into liquid on the cold cup? (or something similar)
It was atrociously hot and Kraken Kid needed a cold drink. He mixed sparkling water with lemonade. Right away, bubbles of carbon dioxide gas formed and floated into the air. He noticed that if he left the cup uncovered, the fizz disappeared faster. After the lemonade finished fizzing, how did the total mass of the mixture change, and why?
What is the the total mass will decrease because the gas escaped from the cup?
When you pan-sear an egg, what kind of change occurs and how can you tell?
Frying (pan-searing) an egg is a chemical change because:
Heat changes the egg proteins, forming new substances.
The egg changes color, texture, and properties.
This change is irreversible; you cannot turn a cooked egg back into a raw egg.