Mass and Density
What is the difference between mass and weight?
Mass is the amount of matter in an object, weight is the gravitational force pulling down on an object.
What is temperature?
Temperature is a measure of the average kinetic energy (motion) of the particles in a substance.
Solid, Liquid, gas
What are the three parts of the atom? What are the charges?
Proton (+), Neutrons (neutral), Electron(-)
What are the signs of a chemical reaction?
Odor
temperature change
bubbles
color change
precipitate forms
What is the density of an object that has a mass of 20g and a volume of 5 cm3?
4 g/cm3
What is the melting point of water in degrees celcius?
0 degrees Celsius
What outside factors cause a change in phase?
Temperature, Pressure, type of substance
Where are protons located in the atom?
Why is it easier for someone to float in the ocean than in a swimming pool?
The salt in the ocean water makes it more dense than the water in a pool. The denser the water, the more likely a person is to float.
You have two boxes, Box A and Box B. Both boxes have the same mass but box A has a volume of 20 ft3 and box B has a volume of 22 ft3. How do the densities of the two boxes compare?
Box A has a greater density
On a heating curve, what does a flat line mean for a substances temperature?
The temperature is constant
What is the triple point on a phase change diagram?
The point where solid, liquid, and gas exist in equilibrium.
Why is H2 a molecule and H2O is a compound?
H2 is made up of one element H2O is made of multiple
What causes a chemical reaction?
Particles collide with each other. Old bonds break between atoms. New bonds form, creating different substances.
What is the mass of an object that has a density of 50 g/cm3 and a volume of 2 cm3?
100 g
What affect does temperature have on particle movement ?
The higher the temperature, the more particle movement.
On a heating curve, a flat line indicates ....
Identify the elements in the following formula. Identify the number of atoms for each element. Ca3(PO4)2
Calcium-3
Phosphorous-2
Oxygen- 8
Is the following chemical equation balanced or unbalanced? C3H8+O2→CO2+H2O
Unbalanced
What is the volume of an object that has a mass of 30 g and a density of 5 g/cm3?
6 cm3
What is 1 kelvin in degrees celsius?
−272.15∘C
What is the name of the curve that separates the states solid and liquid on a phase diagram?
fusion curve
Identify the elements in the following formula. Identify the number of atoms for each element. 2(NH4)3PO4
Nitrogen: 6
Hydrogen: 24
Phosphorous: 2
Oxygen: 8
Balance the following chemical equation; Al+O2→Al2O3
4Al+3O2→2Al2O3