Random
What is atomic radius?
The size of an atom
How many total electrons does boron (B) have?
5
What is the molar mass of Sodium?
22.99 grams/mol ~ or 23 grams/mol
Finish the following sentence: the amount of energy in the universe ______.
Is constant
Never changes
etc.
Write this number in scientific notation:
0.0004
4 x 10-4
Is lithium fluoride (LiF) a molecular compound or ionic compound?
Ionic
How many valence electrons does sulfur have?
6
What is the atomic mass of Magnesium? (WITH UNITS)
24.305 amu or 24.305 g/mol
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
Write this number in standard notation:
2.98 x 103
2980
Write the chemical formula for tetranitrogen dioxide.
N4O2
How many electrons does a Lithium ion (Li+) have?
2
How many grams of Calcium are in 13 moles of Calcium?
520 grams
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
Convert 2.2 kJ to J
2200
The electronegativity of elements increases going left to right across a period because ___________ is also increasing.
number of protons in nucleus
Write the electron configuration for magnesium (Mg)
1s22s22p63s2
OR
[Ne]3s2
How many moles of HCl are in 8 liters of a 1.5 M solution of HCl?
12 moles
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
Convert 3 mg to g
(1 g = 1000 mg)
0.003 g
Write the chemical name for this compound:
Cu(NO3)2
Copper (II) nitrate
Write the electron configuration for the most common ion of chlorine.
[Ar]
OR
1s22s22p63s23p6
How many grams of Potassium is in 1 liter of a 5 M solution of Potassium Chloride (KCl)?
195 grams
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
Convert 2.55 x 104 mg to kg
(1 g = 1000 mg)
(1 kg = 1000 g)
0.0255 kg