NEW
Font size
Worksheets11 chemistry
Total questions: 15
Worksheet time: 10mins
Which subatomic part of an atom gives it a positive charge?
Neutron
Proton
Electron
Nucleus
What is the smallest 'building block' of the elements that make up the universe?
An atom
An electron
A proton
A cell
An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?
0
7
6
13
A certain atom of oxygen contains 8 protons, 8 neutrons, & 8 electrons. Another atom of unknown identity contains 9 protons. Which of the following MUST be true about this unidentified atom?
It has 9 neutrons in its nucleus.
It is an isotope of oxygen.
Its atomic mass is a decimal number.
It cannot be an atom of oxygen.
What type of bond is formed when atoms share electrons?
Covalent
Ionic
Hydrogen
Polyatomic
How are ionic and covalent bonds alike?
They both form organic molecules.
They both fill outer electron shells.
They both transfer electrons from one atom to another.
They both transfer protons from one atom to another.
A substance with a pH of 8 is a
acid
base
neutral
The electrons in the outermost energy level are called
valence
ions
covalent
farthest out
Activation energy is
The energy to start a car
The energy needed to break down CO2
The energy needed to start a reaction
The energy used to digest food
Acids have more ______ ions than bases
OH-
H-
OH+
H+
If salt is dissolved in water, water is the ____________
Solution
Solute
Solvent
Suspension
If salt is dissolved in water, water is the ____________
Solution
Solute
Solvent
Suspension
The image shows the periodic grid for SODIUM. What is Sodium's atomic mass?
11
12
23
Impossible to tell
A substance that changes the rate of a chemical reaction without being used up in the reaction is called a ________________.
bond
catalyst
acid
ion
