Which of the following is classified as an element?
Question 2
2.
How many known elements are there?
Question 3
3.
Which is not a mixture?
Atomic structure and electron configuration
Question 4
4.
How many valence electrons are there in a magnesium atom?
Question 5
5.
How many valence electrons are there in a oxygen atom?
Question 6
6.
How many valence electrons are there in a sodium atom?
Question 7
7.
How many neutrons are in 25Mg?
Question 8
8.
The number of protons in carbon-13 is
Question 9
9.
Elements with the same number of protons that have a different number of neutrons, hence a different atomic mass are known as
Question 10
10.
What is the shape of an s orbital?
Question 11
11.
What is the electron configuration of boron?
Question 12
12.
What is the electron configuration of O2-?
Question 13
13.
JJ Thomson, when he discovered there were negative particles came up with which model of the atom?
Periodic Trends and Periodic Table
Question 14
14.
Which of the following elements has the biggest radius?
Question 15
15.
Which of the following elements has the smallest radius?
Question 16
16.
Which of the following element is in the alkali metal group?
Question 17
17.
Which of the following elements has properties most similar to fluorine?
Question 18
18.
As you move from left to right across the second period of the periodic table:
Bonding, naming and chemical equations
Question 19
19.
What is true about covalent bonds?
Question 20
20.
In a chemical reaction between acetic acid and sodium hydrogen carbonate where sodium acetate, water and carbon dioxide are formed, which are the reactants?
Question 21
21.
Which of the following not true about chemical reactions?
Question 22
22.
Which substance is most likely ionic?
Question 23
23.
What is the charge on a sulfur ion
Question 24
24.
Select the correct name for: BF3
Question 25
25.
Select the correct name for: Mg(NO3)2
Question 26
26.
Choose the correct formula for sodium cyanide
Question 27
27.
Choose the formula for copper (II) hydroxide
Question 28
28.
Which coefficients prove the conservation of mass in the following equation: CO + Fe₂O₃ --> Fe + CO₂
Question 29
29.
Which coefficients prove the conservation of mass in the following equation: Cu + 2AgNO₃ --> 2Ag + Cu(NO₃)₂
The mole, molar mass and conversions
Question 30
30.
The number of hours in 2 years can be calculated by which of the following?
Question 31
31.
What is the molar mass of NaOH?
Question 32
32.
How many moles are in 35.6 grams of iron?
Question 33
33.
How many grams does 2.1 moles of water weigh?
The rest of the questions use this balanced equation. 2AlCl3 + 3Na2SO4 --> Al2(SO4)3 + 6NaCl
Question 34
34.
How many moles of NaCl are produced from 2.0 moles of AlCl3?
Question 35
35.
5.4 grams of NaCl needs how much AlCl3 to react completely?