Properties & Changes
The boiling point of acetone is about 56°. Is this a physical or chemical property?
Physical Property
What is the chemical symbol for Helium? (case-sensitive)
He
Is chex mix an example of a mixture or solution?
Mixture - each substance keeps its own properties and can be easily separated
What is the formula for the conservation of mass?
Mass of reactants = Mass of products
Which state of matter is the only one to hold its own shape instead of taking the shape of the container it's being held in?
Solid
Alcohol is flammable. Is this a physical or chemical property?
Chemical property
What is the atomic number AND relative atomic mass of Magnesium? You must correctly indicate which number is which.
Atomic Number - 12
Relative Atomic Mass - 24.31
Is lemonade a mixture or solution?
Solution - the composition is the same throughout; the particles dissolve without seeing the dissolved particles
100 grams of reactant A combines with 200 grams of reactant B to create product C. Find the mass of product C.
300 grams
Which state of matter has particles that are the furthest apart compared to the other 2 states?
Gas
An ice cube fell on the floor while I was filling my water bottle. It melted all over the floor. Is this a physical or chemical change?
Physical Change
Is coffee a homogeneous or heterogeneous mixture?
Homogeneous
In a reaction, 25 grams of C breaks down to become 10 grams of product A and how many grams of product B?
15
Draw 3 pictures modeling what a solid, liquid, and gas would look like in a container.
(Mrs. Baker will draw this for you.)
Officer Baker likes scrambled eggs. Is scrambling eggs a physical or chemical change?
Chemical Change
If you were insulating electrical wires, would you be more likely to use a metal, metalloid, or nonmetal?
nonmetal - they are poor conductors, which would prevent electricity from leaving the wire where we don't want it to
Is salad a homogeneous or heterogeneous mixture?
Heterogeneous
When 224.4 g of KOH reacts with 88.0 g of CO2, 36.0 g of H2O and an unknown amount of K2CO3 are created. How much K2CO3 is created?
276.4 g of K2CO3
Is Na2CO3 an element or compound?
Compound - it contains more than one element
What is the main difference between physical and chemical changes?
In chemical changes, bonds between atoms are broken and/or reformed. In physical changes, this does not happen.
List all groups that contain nonmetals.
Groups 14, 15, 16, 17, & 18
Describe the difference between homogeneous and heterogeneous mixtures.
Homogeneous mixtures look the the same throughout the mixture whereas heterogeneous mixtures do not. If you took a small sample from anywhere in a homogeneous mixture, it would be the exact same. If you took a sample from multiple pieces in a heterogeneous mixture, you would likely have a very different composition.
A log is burned in a fire pit. It seems as though the log has disappeared. Have the atoms from the log been destroyed? Explain why you think your answer is correct.
No, the atoms have not been destroyed. They have only changed form. The log has been turned into ash, gas, and water vapor. The total mass of all those things from the log added together would equal the mass of the log before it was burned.
Is oxygen an element or compound?