Exam (elaborations)
CHEM 120/103 MODULES EXAM 2025 FINEST MODULE 1-6 PRE PREDICTOR EXAM 100% GUARANTEED PASS
- Course
- Institution
CHEM 120/103 MODULES EXAM 2025 FINEST MODULE 1-6 PRE PREDICTOR EXAM 100% GUARANTEED PASS
[Show more]
Content preview
CHEM 120/103 MODULES EXAM 2025 FINEST MODULE 1-6PRE PREDICTOR EXAM 100% GUARANTEED PASS
MODULE 1 EXAM
Question 1
1. Convert 845.3 to exponential form and explain your answer.
2. Convert 3.21 x 10-5 to ordinary form and explain your answer.
1. Convert 845.3 = larger than 1 = positive exponent, move decimal 2 places
= 8.453 x 102
2. Convert 3.21 x 10-5 = negative exponent = smaller than 1, move decimal 5 places = 0.0000321
Question 2
Using the following information, do the conversions shown below, showing all work:
1 ft = 12 inches 1 pound = 16 oz 1 gallon = 4 quarts
1 mile = 5280 feet 1 ton = 2000 pounds 1 quart = 2 pints
kilo (= 1000) 1/100)
milli (= 1/1000) deci (= 1/10)
centi (=
CHEM 120/103 MODULES EXAM
, 1. 24.6 grams = ? kg
2. 6.3 ft = ? inches
1. 24.6 grams x 1 kg / 1000 g = 0.0246 kg
2. 6.3 ft x 12 in / 1 ft = 75.6 inches
please always use the correct units in your final answer
Question 3
Do the conversions shown below, showing all work:
1. 28oC = ? oK 2. 158oF = ? oC 3. 343oK = ? oF
1. 28oC + 273 = 301 oK oC → oK (make larger)
+273
2. 158oF - 32 ÷ 1.8 = 70 oC oF → oC (make smaller)
-32 ÷1.8
3. 343oK - 273 = 70 oC x 1.8 + 32 = 158 oF oK → oC → oF
Question 4
Be sure to show the correct number of significant figures in each calculation.
1. Show the calculation of the mass of a 18.6 ml sample of freon with density of 1.49 g/ml
CHEM 120/103 MODULES EXAM
,2. Show the calculation of the density of crude oil if 26.3 g occupies 30.5 ml.
1. M = D x V = 1.49 x 18.6 = 27.7 g
2. D = M / V = 26..5 = 0.862 g/ml
Question 5
1. 3.0600 contains ? significant figures.
2. 0.0151 contains ? significant figures
3. 3.0600 ÷ 0.0151 = ? (give answer to correct number of significant figures)
1. 3.0600 contains 5 significant figures.
2. 0.0151 contains 3 significant figures.
3. 3.0600 ÷ 0.0151 = 202.649 = 203 (to 3 significant figures for 0.0151)
Question 6
Classify each of the following as an element, compound, solution or heterogeneous mixture and explain
your answer.
1. Coca cola
2. Calcium
3. Chili
1. Coca cola - is not on periodic table (not element) - no element names (not compound)
appears to be one substance = Solution
2. Calcium - is on periodic table = Element
3. Chili - is not on periodic table (not element) - no element names (not compound)
appears as more than one substance (meat, beans,
CHEM 120/103 MODULES EXAM
, sauce) = Hetero Mix
Question 7
Classify each of the following as a chemical change or a physical change
1. Charcoal burns
2. Mixing cake batter with water
3. Baking the batter to a cake
1. Charcoal burns - burning always = chemical change
2. Mixing cake batter with water - mixing = physical change
3. Baking the batter to a cake - baking converts batter to new material = chemical change
Question 8
Show the full Nuclear symbol including any + or - charge (n), the atomic number (y), the mass number
(x) and the correct element symbol (Z) for each element for which the protons, neutrons and electrons
are shown - symbol should appear as follows: xZ +/- n
31 protons, 39 neutrons, 28 electrons
31 protons = Ga31, 39 neutrons = 70Ga31, 28 electrons = (+31 - 28 = +3)
= 70Ga +3
Question 9
CHEM 120/103 MODULES EXAM
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller BestGradeSolution. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.00. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75759 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now