Solids, Liquids, and Gases
___________is the energy an object has due to its motion.
Kinetic Energy
What is a material called that is made of two or more substances and can be separated by physical means?
Mixture
What is the chemical symbol for carbon?
C
What are the 3 general types of Elements discussed this week?
Metals, Non Metals, Metalloids
How many atoms are in one molecule of H2O?
3
When the temperature of a substance is lowered, its particles __________.
Vibrate more slowly
Table salt (NaCl) is an example of which type of material?
Compound
Match the subatomic particles to their charge. proton, neutron, electron
proton = positive charge
electron = negative charge
neutron = no charge
The ability of metals to reflect light is referred to as .
Luster
Count the Atoms in 2 molecules of Al2(SO4)3
Al - 4 atoms
S - 6
O - 24
34 Total
Most matter ____________ when heated.
Expands
State the law of conservation of mass.
In a chemical reaction, the total mass of the reactants equals the total mass of the products.
A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is .
56
Which element is a gas at room temperature and is used to fill balloons safely?
Helium
Count the Atoms in 3 (NH4)3 PO4
N - 9
H - 36
P - 3
O - 12
60 total atoms
What causes a balloon to remain inflated?
Air particles collide with the walls of the balloon.
You have a bowl of Lucky Charms cereal. You can easily see the different parts like the toasted oats and the colorful marshmallows, and you could pick them apart with your hands. Is this bowl of cereal a homogeneous mixture or a heterogeneous mixture, and how do you know?
It is a heterogeneous mixture because you can see the different parts and they are not spread out evenly.
A friend says, “I know how many electrons the atom has, and I know how many protons it has, but I don’t know whether or not it is neutral.” How would you respond?
If the number of protons equals the number of electrons, the atom is neutral. If the number of protons is greater, the atom has a net positive charge. If the number of electrons is greater, the atom has a net negative charge.
What do we call an element that is shiny, malleable, and a good conductor?
Metal
Count the Atoms in 4 4Al2(CO3)3
Al - 8 Atoms
C - 12 Atoms
O - 36 Atoms
56 Total Atoms
Atoms in a solid material are arranged in a geometric pattern called a(n) ______________.
Crystal
When you stir a spoonful of salt into a glass of warm water until you can no longer see the salt crystals, you have created a solution. Is this solution a pure substance or a homogeneous mixture, and what is one physical way you could get the salt back?
It is a homogeneous mixture (the parts are spread evenly); you can get the salt back by evaporating the water.
A friend says, “The outer energy levels are full, but that doesn’t mean the inner ones are.” How would you respond?
This is incorrect. Energy levels are filled with electrons from lower to higher, so the outer levels could not have become filled until the inner levels were.
Which element is the most reactive nonmetal and is found in toothpaste
Flourine
Count the Atoms in 5(NH4)2 Cr2O7
N - 10
H - 40
Cr - 10
O - 35
95 Total Atoms