Midterm Review Chemistry Please remember this is a guide for the test. If you are able to do more that is great for you because there may be questions that are not on the review but related to the information or topic.
1. Chemistry is the study of _ matter and how it interacts
2. What is inferring? Using prior knowledge to interpret
3. What is metrics? A system of measurement based on 10
4. Convert the following to scientific notation or write in long form
When converting from digit form to scientific notation

If you must move the decimal to the right to place it between the first two non zero numbers then the sign will be x10 to a NEGATIVE power

If you must move the decimal point to the left to place between the first two non zero numbers then it will be x10 to a POSITIVE power
A) 0.0234 2.34 x10 ⁻ ²
B) 65, 500, 000 6.55 x 10 ⁷
C) 0.10 1.0 x 10 ⁻ ¹
D) 1, 000 1.0 x 10³
When converting from scientific notation to digit form

You move the decimal to the LEFT if the sign is negative

You move the decimal point to the RIGHT if the sign is positive
E) 9.8 x 10 ⁻⁶ 0.0000098
F) 2.862 x 10
⁴
28620
5. What is the numerical value and symbol for the following:
Kilo
K
Hecto
H
Nano
N
Milli Giga
m G
Mega
M
Deci
d
1000 100 1/ billion or a billionth 1/1000 billion million 1/10 or a tenth
6. Convert the measurements Draw the chart to help
A) 100 cm = 0.1 m B) 1kg = 1000000 mg C) 10 dl = 1000 mL
7. Two cars are traveling across country. One car is traveling at 150 km/hour and has been traveling for one day. The second car is traveling at 120 km/ hr and has been traveling for 26 hours. Which car has covered more distance? Car 1
Solve for distance.
Car 1 150 km
.
24 hr = 3600 km Car 2 120 km
.
26 hr = 3120 km
hr 1 day hr
8. Perform the following calculation: (5.5 x 10 4 cm) x (1.4 x 10 4 cm).

When multiplying in scientific notation, multiple as usual BUT add the exponents
 Don’t forget that when multiplying units you must square them
5.5 x1.4 = 7.7 x10
⁴+
x10
⁴ = x10⁸ cm x cm = cm²
Answer 7.7x10
⁸ cm²
9. Perform the following calculation: 6.05 x 10 7 g When dividing in scientific notation divide as usual.
6.05 / 8.8 =0 .6875
8.8 x 10 6 cm 3 BUT subtract the exponents
x10 7 –x10 6 = x10 1 0.6875 x 10 1 * move the decimal to get in proper sci. notation would be a -1 since that is true the x10 would cancel and the resulting answer would be 6.875g/cm 3

10. Complete the table below by making the appropriate temperature conversions.
Formulas C= 5/9 (F-32)
F=9/5 C+32
K=C+273.15
C= K-273.15
Problem
A
B
C
ºC
3.17 ºC
100ºC
175.15
ºC
K
270K
373K
98 K
ºF
26.3ºF
212 ºF
347 ºF
11. What are physical properties? Properties that can be observed without changing the object
12. What are chemical properties? Properties that are observed only when you change the object
13. Define each of the words and label as chemical or physical properties.
Solubility malleability phase change reactivity
P – to dissolve P- to shape P- solid , liquid or gas C- gives off gas, temp.
combustible viscosity
C- to give off heat and light C- thickness
14. What is the formula for density? D= m/v
15. What is the density of a substance that has a volume of 10 ml and mass of 5 grams? Please put the correct units. D = 5 grams/ 10 ml = .5 g/ml
16. Will the substance float or sink in water, which has a density of 1 g/mL? Float
17. What is an atom? The smallest a particle can be and still retain its properties
18. What is and element? A pure substance that cannot be broken down into anything else
19. What is a compound? 2 or more elements joined together
20. What is alpha, beta and gamma radioactive decay?
Alpha particles- gives up a helium, stopped with paper
2
4 He
Beta particles – faster moving, gives up 0
-1
B stopped with lead
Gamma – high energy, most damaging, gives off and Alpha and Beta particle. Gamma’s have no charge
21.
Lr 256
103

2
4 He + 252
101
Md
Pa 231
91

2
4 He + 228
89
Ac
22.
Sr 90
38
 0
-1
B + 90
37
Sr
Np 239
93
 0
-1
B + 239
92
Np

23. Name the group name for each of the following : IA, IIA, IIIA, IVA, VA, VIA, VIIA, VIIIA and groups
Alkali metal, Alkali Earth metals, boron group, Nitrogen group, oxygen group, Halogens, Noble gases
24. For each pair of elements, determine which ion is larger. a. Po and Po 2b. Rb and Rb + c. Na + and Mg 2+
25. For each pair of elements, determine which atom is smaller. d. Li and F e. Be and Ba f. In and Sb
26. For each pair of elements, determine which atom’s first ionization energy is higher. g. P and Bi h. Tl and Po i. K and Fr

32)Magnesium and phosphorous Mg
3
P
2
33) Hydrogen and sulfur H
2
S
H
34) NaCl
35) SiH
4
H Si H Na Cl
H
36) N
2
H
4
Dinitrogen tetrahydride
37) Nitrogen monoxide NO
38) As
2
O
3
Diarsenic trioxide
39) Sulfur dioxide SO
2
40) Ammonium nitrate NH
4
NO
3
41) K
2
CO
3
42) Calcium chlorate
43) CsPO
4
Potassium Carbonate
Ca(ClO
3
)
2
Cesium phosphate
Be able to balance a chemical equation!!
1. What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s?
2. Chromium-48 has a short half-life of 21.6 h. How long will it take 360.00 g of chromium-48 to decay to
11.25 g.
3. If the half-life of uranium-
235 is 7.04 × 10 8 y and 12.5 g of uranium-
235 remain after2.82 × 10 9 y, how much of the radioactive isotope was in the original sample?
4. Potassium-42 has a half-life of 12.4 hours. How much of an 848 g sample of potassium-42 will be left after 62.0 hours?
5. All isotopes of technetium are radioactive, but they have widely varying half-lives. If an 800.0 g sample of technetium-99 decays to 100.0 g of technetium-99 in 639 000 y, what is its half-life?