chemistry grade improvement test
REALLY NEED THESE ANSWERS BEFORE THE CLOCK STRIKES 12:00
will mark brain list <3

1 Which set of elements share the most similar properties?
Argon, Potassium, and Calcium
Iron, Cobalt, and Nickel
Aluminum, Gallium, and Indium

2 Which subatomic particle is not indicated by the atomic number of a neutral atom?
Proton
Neutron
Electron

3 Which elements share the valence electron arrangement?
Germanium and Arsenic
Sulfur and Selenium
Calcium and Yttrium

4 Which of the following contains only intensive properties?
Volume and Mass
Mass and Weight
Density and Melting Point

5 Which type of mixture could describe pewter?
Homogeneous
Heterogeneous
Pure Substance

6 If the electronegativity difference between two atoms is less than 0.3 what type of bond could exist between these atoms?
Nonpolar covalent
Polar covalent
Ionic

7 In order to compare volume, pressure, temperature, and amount of a gas reliably, which units must the temperature be measured in?
Fahrenheit
Celsius
Kelvin

8 Which of the following coefficients balances this equation?
_ HNO3 + Ca(OH)2 → Ca(NO3)2 + _ H2O
1, 2
2, 2
2, 1

9 What is the oxidation number of oxygen in sodium peroxide, Na2O2?
+1
-1
-2

10 Which property explains the high surface tension of water?
Strong polar covalent bonds between molecules
Strong hydrogen bonds between molecules
Strong ionic bonds within molecules