Which is a physical change, water evaporating or baking a cake?
What is water evaporating?
100
A pair of scissors is left outside and rusts. What evidence shows a chemical change has taken place?
What is rust has appeared and the scissors have turned an orange color?
100
Baking soda and vinegar are mixed in a bottle. A balloon is placed over the top of the bottle, expands, and fills with gas. What type of system is this?
What is a closed system?
100
Ethan added cocoa powder to his milk to make hot chocolate. This is an example of a ______.
What is physical change?
200
What are the three states of matter?
What is solid, liquid, and gas.
200
Is matter created or destroyed in a physical change?
What is "nether"? Matter is not created or destroyed in a physical change.
200
Chemical reactions occur when ________ form.
What is "a new substance"?
200
A system that does not gain or lose matter is called?
What is a closed system?
200
A box of marbles weighs 1 pound. You spill the marbles all over the floor. What happens to the mass of the marbles?
What is "the mass stays the same"?
300
Faster moving molecules have more
What is heat energy (thermal energy)?
300
A physical change is a change in size or ______.
What is shape?
300
Baking soda and vinegar are mixed in a bottle. A balloon placed over the top fills and expands with a gas. There are bubbles forming inside the bottle. What type of change is occuring?
What is a chemical change?
300
You put two ice cubes in a ziploc bag, seal it, and weigh it. The bag weighs 0.5 grams. After three hours the ice is completely melted. What is the weight of the bag now?
What is 0.5 grams?
300
5 grams of orange drink is added to 50 grams of water. What would you expect the new drink to weigh?
What is 55 grams?
400
Water exists on Earth in all 3 states if matter. Steam from a boiling pot of water is an example of which state of matter?
What is gas?
400
Why is dissovling salt in water a physical change?
What is "you can separate the salt back out"?
400
What are two signs that a fire is a chemical change?
What is it gives off heat and light?
400
Water evaporating from a puddle is an example of what type of system?
What is an open system?
400
Ice cream melting...physical or chemical change?
What is physical?
500
What causes matter to change states?
What is heating or cooling it?
500
Why is melting wax a physical change?
What is wax goes from solid to liquid back to solid...change is state of matter?
500
Name 5 signs that a chemical change has occurred.
What is change in color, forms gas, light, heat, and bubbles form?
500
The weight of the bottle, vinegar, and baking soda is 3.6 grams. After I mix the baking soda and vinegar, I should expect the weight of the bottle to be the same or change?
What is change?
500
When an object is cooled its atoms and molecules....