Density
What is the correct formula for density?
D = m/V
Name group 1 on the periodic table
Alkali Metals
Define solid, liquid, and gas, in terms of shape and volume
liquid: indefinite shape, definite volume
gas: indefinite shape, indefinite volume
What is the charge of a proton? neutron? electron?
positive, neutral, negative
Define Solution
a homogeneous mixture of 2 or more substances
5 g/ cubic cm
The atomic number is equal to...
The number of protons and electrons an element has
Rusting is an example of what type of change?
Chemical Change
Where are protons found? neutrons found? electrons?
Protons and neutrons: inside the nucleus
Electrons: orbiting the nucleus
define solute and solvent
solute: what is being dissolved
solvent: what is doing the dissolving
How do you determine the volume by water displacement?
2. Drop irregular shaped object in.
3. Record final volume
4. subtract final volume - initial volume
Describe the location on the periodic table of metals, non metals, and metalloids, in relation to the "staircase"
metals or to the left
non metals or to the right
metalloids are on the staircase
Are phase changes (going from solid to liquid, liquid to gas, etc) chemical or physical changes?
Physical Changes
How many elements and atoms are in the compound NaClO
3 elements, 3 atoms
Which substance is considered to be the "universal solvent"
Water
3 cm
Which way to periods run?
Which way do groups run?
How many periods are there?
How many groups are there?
horizontal
vertical
7
18
How can you tell a chemical change has occurred?
The composition of the substance has completely changed. Smoke or burning, bubbling or fizzing, unexpected temp. change, unexpected color change, a new substance (precipitate) has formed
Name the two types of bonds we learned and describe how you can tell the difference between the two.
Ionic and Covalent. Ionic is between a metal and non metal, covalent is non metals only. Ionic bonds transfer electrons between atoms. Covalent bonds share electrons evenly.
Describe the difference between soluble and insoluble.
Soluble means it can dissolve. Insoluble means it cannot dissolve.
If the density of gold is 19.3 g/ cubic centimeter and you possess 100 grams of it, what is the volume of your sample?
5.18 cubic centimeters
A sample of Oxygen has a mass number of 17. How many neutrons does this isotope of oxygen have?
9 neutrons
17-8 = 9
protons + neutrons = mass number
Name an element that has similar physical and chemical properties to Flourine (F)
Cl, Br, I
All in the same group. Groups run vertically, periods run horizontally.
Define valence electrons and stable octet
Valence electron: outer most electron
stable octet: filled outer shell (8 electrons)
Name the 3 factors that allow us to increase the rate of dissolving
increase temp.
stir
Increase surface area of solute