Units
What is a proper unit for volume?
mL, L, cm3
We always use the metric system in science, so no points for things like oz, gallons, quarts, etc
Convert 1.5 L to mL
1500 mL
(no points if you have no units)
Answers will vary, but it must include two or more elements chemically bonded together
Some examples could include: CO2, H2O, CaCl2, NaHCO3
Give an example of a physical property.
Answers will vary.
Possible answers could include: color, shape, density, texture, state of matter
What are some steps you need to take to properly measure liquids?
Get eye level and read at the bottom of the meniscus
What is a proper unit for mass?
g, kg, mg
We always use the metric system in science, so no points for lbs, oz, etc
Convert 34 cm to mm
340 mm
(no points if you have no units)
What is the definition of an element?
A substance that cannot be broken down down into simpler substances by physical or chemical means
Give an example of a chemical change
Answers will vary
Some answers could include: burning wood, baking, cooking, rusting, reacting, it's in the bag lab when everything was combined
What piece of lab equipment should you use to measure mass?
Electronic balance
What is a proper unit for length?
km, m, cm, mm
We always use the metric system in science, so no points for in, feet, miles, etc
Convert 6.5 g to kg
0.0065 kg
(no points if you have no units)
Is 14k gold an element, compound, or mixture?
Mixture. While the element gold is on the periodic table (and is therefore an element), 14k gold is not pure gold and is a mixture of several different metals.
Is being flammable a physical or chemical property? Use evidence to support your answer.
Chemical. In order to determine if something is flammable, you have to light it on fire and make something new.
Why do we use scientific notation?
It's a shortcut to write really big or really small numbers which require lots of zeros that we don't want to have to write out
Why is it important to always use units on an answer?
Naked numbers don't mean anything! If you say your piece of paper is 28, what does that mean? 28 what? cm? mm? marshmellows? I don't know!
Convert 1750 cg to dag
1.75 dag
(no points if you have no units)
How is a compound different than a mixture?
Compounds have 2 or more elements chemically bonded. Mixtures have 2 or more particles physically combined. Mixtures can be separated using physical separation techniques while compounds require chemical separation techniques.
Is density a physical or chemical property? Use evidence to support your answer.
Physical. Density is the relationship between mass and volume. You can measure both mass and volume of an object without changing it or creating something new.
(no points if no evidence provided)
Does something with more mass always have more volume? Give an example of 2 objects (one with more mass and one with more volume)
No
Examples could include: gold and feathers, brick and balloon, iron and Styrofoam
What is a proper unit for density?
g/mL, g/cm3
there is a mass unit per volume unit
Convert 45 dm to m
4.5 m
(no points if you have no units)
What two properties are required for an object to be considered matter?
Mass and volume
Is rusting a physical or chemical change? Use evidence to support your answer.
Chemical. Oxygen atoms are added to the metal, so a new substance is created.
(no points if no evidence provided)
What technique is used to measure the volume of an irregularly shaped object?
Volume by displacement (add water to graduated cylinder, measure, add object to graduated cylinder, measure, subtract the two volumes)