Density
What is the equation we use to figure out density?
Density= mass/volume
Physical Change
What element is Na?
Sodium
Where do you find the electrons in an atom?
Outside the nucleus
He
If more than one, one correct answer gives you a chance for points, while any incorrect takes that chance away
Element
What is the density of something that weighs 100g, and has a volume of 30 cm3?
Round to the nearest hundredth
3.33 g/cm3
Burning paper
Chemical change
What is the abbreviation for Mercury?
Hg
What is the charge of an electron?
negative
O2, the oxygen we breathe
If more than one, one correct answer gives you a chance for points, while any incorrect takes that chance away
Element, Molecule
Josie has a bag of ice that is 5kg. She left it in a sealed container and it melted. How much does the resulting water weigh? How do you know this?
5kg because the water doesn't disappear as it melts, it just physically changes from solid to liquid. It might take up a different volume, but its mass is the same.
You decide you want to carry a boulder home from the beach. It is 30 centimeters on each side. It is made of granite, which has a typical density of 2.8 g/cm3. How much will this boulder weigh?
One extra shot if you show me answers with two different units
75600 g
75.6 kg (~165 lbs)
The log is brown
physical property
How many protons are in Bismuth?
83
Where do you find the protons? (be specific about the name)
In the nucleus
Water
If more than one, one correct answer gives you a chance for points, while any incorrect takes that chance away
H2O, Molecule, Compound
Would a piece of wood that measures 3cmX6cmX4cm with a mass of 80g be able to float on water? Show "Yes" or "No" the correct number AND units to back up your answer.
1.1 g/cm3
No it will not float, because it is more dense than water.
You measure water in a graduated cylinder to be at 54 mL, and after you drop an unknown rock into the water it moves to 65 mL.
You then weigh the rock, and it weighs 15.3 g.
What is the rock's density? round to nearest hundredth
1.39g/mL
The muffins baked for 20 minutes until done
Chemical property
What elements are in As2S3, and how many of each? Also include total number of atoms in the molecule.
Arsenic (2)
Sulfur (3)
Total atoms: 5
Is volume size dependent or size independent?
Size dependent
Carbon Dioxide
If more than one, one correct answer gives you a chance for points, while any incorrect takes that chance away
CO2 , molecule, compound
Explain why the appearance of gas isn't always a sign of a chemical change.
AWV
Example: It can be a sign of a physical change (Dry ice turning into CO2 gas while in water), or a sign of gas escaping (a carbonated beverage fizzing when you take the lid off, the gas was already there)
A golden-colored cube is handed to you. The person wants you to buy it for $100, saying that is a gold nugget. You read that the density of gold is 19.3 g/cm3. You measure the cube and find that it is 2 cm on each side, and weighs 40 g. Is it actually gold? Include the density you calculate to help you decide.
No, its actual density is 5 g/cm3, so don't buy it!
What are four of the six indicators that a chemical change has probably occurred?
Odor change, energy/temperature change, color change, bubbles, appearance of light, formation of solids from liquids
What is the atomic weight of Radium?
226
Is density size dependent, or size independent?
Independent
Ozone
If more than one, one correct answer gives you a chance for points, while any incorrect takes that chance away
O3, element and molecule