Sem 1 Final Exam Review

Random

100

What is atomic radius?

The size of an atom

200

Is lithium fluoride (LiF) a molecular compound or ionic compound?

Ionic

300

Write the chemical formula for tetranitrogen dioxide.

N₄O₂

400

The electronegativity of elements increases going left to right across a period because ___________ is also increasing.

number of protons in nucleus

500

Write the chemical name for this compound:

Cu(NO₃)₂

Copper (II) nitrate

Electrons

100

How many total electrons does boron (B) have?

5

200

How many valence electrons does sulfur have?

6

300

How many electrons does a Lithium ion (Li⁺) have?

2

400

Write the electron configuration for magnesium (Mg)

1s²2s²2p⁶3s²

OR

[Ne]3s²

500

Write the electron configuration for the most common ion of chlorine.

[Ar]

OR

1s²2s²2p⁶3s²3p⁶

Moles

100

What is the molar mass of Sodium?

22.99 grams/mol ~ or 23 grams/mol

200

What is the atomic mass of Magnesium? (WITH UNITS)

24.305 amu or 24.305 g/mol

300

How many grams of Calcium are in 13 moles of Calcium?

520 grams

400

How many moles of HCl are in 8 liters of a 1.5 M solution of HCl?

12 moles

500

How many grams of Potassium is in 1 liter of a 5 M solution of Potassium Chloride (KCl)?

195 grams

Thermo

100

Finish the following sentence: the amount of energy in the universe ______.

Is constant
Never changes
etc.

200

Find the Δ E of a car tire if the work done by the system is +106 joules and the heat added +43.5 joules.

+149.5 joules

300

How much heat is released when 25 g of water at 90°C cools to 50°C? The specific heat capacity of water is 4.186 J/g°C. 

4.18 kJ or 4180 J

400

A 500 g sample of an unknown substance was heated from 25°C to 35°C. In the process, the substance absorbed +509 joules of energy. What is the specific heat capacity of the substance?

0.101 J/gC

500

You add 500 J to two samples of Copper and Silicon. They are the same mass, but Silicon increases in temperature 1.5x more than Copper. Which has a higher specific heat capacity?

Copper

Math

100

Write this number in scientific notation:

0.0004

4 x 10^-4

200

Write this number in standard notation:

2.98 x 10³

2980

300

Convert 2.2 kJ to J

2200

400

Convert 3 mg to g

(1 g = 1000 mg)

0.003 g

500

Convert 2.55 x 10⁴ mg to kg

(1 g = 1000 mg)

(1 kg = 1000 g)

0.0255 kg