Intro to Chemistry
1. As a branch of science, chemistry is the study of what?
matter
unit for length is what?
meter
If 20 mL of ethanol is mixed with 80 mL of water, what is the percent by volume of ethanol
20%
How many protons, electrons, & neutrons does the following element have: Mn?
25 P
25 e-
30 n
Is the following compound ionic or covalent? LiC2H3O3
Ionic
The amount of matter in something is its what?
mass
1/1,00g is what unit?
cg
What is the concentration of a solution expressed in g/mL if 25g of solute is dissolved in 40 mL of water?
0.63 g/mL
Is the following atom a cation or an anion? Why? H+
Cation
Give the chemical formula for the following molecules: a molecule that has 1 atom of potassium & 1 atom of bromine
KBr
A chemical reaction is best described as when...
The atoms in a molecule are rearranged
When you add 6.324 + 0.00503 together how many significant figures does your answer have?
3
To make a 20 percent NaCl solution, add 20 grams of NaCl to ___________________ ml of H2O.
80
How many protons, neutrons, and electrons does the following cation have? Fe3+
26 P
29 n
23 e
A compound is broken down into its elements of carbon, nitrogen, & hydrogen. During the process 12.0g of carbon, 14.0g Nitrogen, & 3.0g hydrogen were formed. What is the mass of the compound before it was broken down?
29.0 grams
The density of an object is calculated by dividing the what by its what?
mas by volume
Convert 8,070,000 cm to dm
807,000 dm
What is the percent by volume of ethanol in a solution made by adding 25 mL of ethanol to enough water to make 100 mL of solution?
25%
What is the atomic mass of Selenium (Se)?
78.960
Name the following compound: Al2S3
Dialuminum trisulfide
8. An attempted explanation of observations is called a what?
Hypothesis
What is the advantage of using the metric system in chemistry?
everything is divided by 10
If 162.35 g aluminum hydroxide are dissolved in 6750 mL of solution, what is the concentration of the solution?
0.02405 g/mL
How many periods and groups are there on the periodic table?
Bonus (100pts) What are the family names?
18 groups
alkali metals, halogens, noble gases, alkaline earth metals, transition metals
7 periods
Calculate the molecular mass for the following: P4
123.896g