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100
When mixing chemicals, what is the MOST important piece of safety equipment?
Goggles
100
Compound or Element, and what are the elements? CO
Compound Carbon and Oxygen
100
If Sara puts a cork in a bottle that has pickle juice and baking soda in it, eventually the cork will pop out of the bottle. What causes the cork to be pushed out of the bottle?
There is a gas that forms and expands, causing the cork to pop out.
100
If you break a beaker, what is the first thing you should do?
Tell the teacher.
100
What piece of equipment would be used to find the mass of a rock?
Balance
200
Which of these is NOT a piece of safety equipment? Goggles Forceps Apron
Forceps (tweezers)
200
Element or compound, and what elements? Fe
Element Iron
200
If I mix two liquids together and a solid forms, what is that solid called?
A precipitate.
200
You are experimenting to test whether plants need sunlight to grow. How much sunlight should you expose the control plant to?
None.
200
What piece of equipment would be used to find the volume of a small rock?
Graduated cylinder
300
When you enter the classroom you find beakers and graduated cylinders on your table. What should you do with them?
Nothing, do not touch lab equipment unless instructed to do so.
300
Element or compound and which elements? C6H12O6
Compound Carbon, Hydrogen, Oxygen
300
Name 4 ways to know a chemical change has taken place.
Gas is formed Change in temperature Change in color A precipitate is formed
300
If you are testing the amount of sunlight plants need to grow, should you have different types of plants or all the same kind?
All the same kind. You should only test one thing at a time, so if you are testing sunlight, you should not test different plants.
300
What is the formula that we use to find density?
Mass divided by volume.
400
If a graduated cylinder full of a chemical gets broken, what should you do?
Tell the teacher, so she can safely clean it up.
400
Element or compound, and which elements? CO
Compound Carbon and Oxygen
400
If I burn a piece of paper, is it a chemical or physical change? How do you know?
Chemical, because you get a new substance (ash) that cannot go back to the original substance.
400
If you were measuring the width of a sheet of paper, what unit should you measure in (remember this is science class).
centimeters (cm)
400
What is the density of an object that has a mass of 26.5 grams and a volume of 3.5 ml?
7.57 g/ml
500
Why should a teacher keep broken glass in a separate container and not just throw it in the trash?
If it is in the trash it could cut someone who is throwing something away, or taking the trash bag out of the trash can.
500
Is water a compound or an element? How do you know?
It is a compound, because it is made of 2 different elements (hydrogen and oxygen)
500
How many element and atoms are in a molecule of water?
Elements-2 Atoms-3
500
I have three substances; one of them is water (C). One (A) has a density less than water, and the third (B) has a density greater than water. Which of the substances will float on the water?
A
500
The density of water is 1 g/ml. If I have an object that has a volume of 45 ml, and a mass of 42 grams, will that object sink or float in water?
Float