Unit 1 Review

Scientific Notation/Sig Figs

100

What is 0.006426 in Scientific Notation?

What is 64,000,000,000 in Scientific Notation?

6.426 x 10^-3

6.4 x 10¹⁰

200

How many Sig Figs do the following numbers have?

200

126.350

0.0035

200 - Ambiguous

126.350 - 6

0.0035 - 2

300

Complete the math with the correct number of Sig Figs

3.281 + 2.05

98.02 - 45.0268

5.33

52.99

400

Complete the math with the correct number of Sig Figs

(98.0256 - 87.036) * 31.2

343

500

Complete the math with the correct number of Sig Figs

(33.42 / 2.3054) - 8.694

5.80

Accuracy/Precision & Metric Conversions

100

Describe what precision and accuracy mean

Accuracy is how close your measurements are to the target, and precision is how close the measurements are to each other

200

Convert 8,611 kilometers to meters

8.611 meters

300

Convert 895 micromoles to moles

0.000895 micrometers

400

You are performing a lab measuring the density of an unknown material. You do three trials and calculate the densities to be 5.060 g/mL, 5.032 g/mL, and 5.621 g/mL. You later find that the density of the material was supposed to be 10.981 g/cm. What can we say about accuracy and precision.

Not accurate (far from target)

Precise (Your measurements are close to each other)

500

Convert 6,000 mm to Gigameters

6 x 10^-9 Gigameters

Classifying Matter

100

Argon Gas

Pure Substance - Element

200

Salsa

Heterogenous Mixture

300

Vanilla Milkshake

Homogonous Mixture

400

Calcium Carbonate (CaCO₃)

Pure Substance - Compound

500

Tap water

Homogonous Mixture

Chemical or Physical Change?

100

I coil copper wire

Physical

200

Two clear liquids when combined, create a bright yellow precipitate

Chemcial

300

Your stomach digests your lunch

Chemical

400

Ice sublimes into water vapor

Physical

500

Clay gets fired in a kiln

Chemical

Conservation of Mass & Specific Heat

100

162 g of iron(III) chloride (FeCl₃) reacts with 120 g of sodium hydroxide (NaOH) to produce 107 g of iron(III) hydroxide (Fe(OH)₃) and an unknown amount of sodium chloride (NaCl). How much sodium chloride was produced?

175 g of Sodium Chloride

200

115 g of calcium metal reacts completely with water to produce 70 g of calcium hydroxide and an unknown mass of hydrogen gas (H₂) that escapes into the air. What is the mass of the escaped hydrogen gas?

45 g of hydrogen gas escaped 

300

How much heat is required to raise the temperature of 250 g of liquid water from 20° C to 85° C? c_water=4.184

67,990 J

400

A block of copper releases 1,540 J of heat as it cools from 120° C down to 20° C. What is the mass of the copper block? c_copper = 0.385 J/g° C

40 g of Cu

500

A 50 g sample of aluminum  starts at an initial temperature of 22° C. If it absorbs 1,345.5 J of heat, what is its final temperature?

c_aluminum = 0.897 

52 ° C