Cobalt has an atomic mass of 59 and an atomic number of 27. How many neutrons does cobalt have?
2 points
2
Question 3
3.
Which of the following identifies the number and location of protons in a lithium atom?
2 points
2
Question 4
4.
In a sugar water solution...
5 points
5
Question 5
5.
Match each description with the correct property of water.
Draggable item
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Corresponding Item
Water has a resistance to changes in temperature.
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Cohesion
Water can move against the force of gravity by traveling through blood vessels from our feet to our heart.
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High Heat Capacity
Water is great at breaking apart substances due to its partial charges.
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Capillary Action
Water forms droplets.
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Surface Tension
Water acts as a great barrier due to its cohesive forces.
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Universal Solvent
2 points
2
Question 6
6.
Which statement about polar molecules is true? Select all that apply.
2 points
2
Question 7
7.
Which statement about ionic bonds is true? Select all that apply.
2 points
2
Question 8
8.
What defines if an atom is stable?
2 points
2
Question 9
9.
Which statement about potassium-42 is true? Select all that apply.
2 points
2
Question 10
10.
Examine the diagram below. Which statement below is false?
3 points
3
Question 11
11.
In the space below, draw a sodium atom with all its subatomic particles.
8 points
8
Question 12
12.
Please drag each statement under its correct category (acid, base, or water).
Has a pH of 7.
Releases equal concentrations of H+ and OH- ions in solution.
Releases more OH- ions than H+ ions in solution.
An example is lemon juice.
An example is bleach.
Has a pH less than 7.
Releases more H+ ions than OH- ions in solution.
Has a pH greater than 7.
Acid
Base
Water
2 points
2
Question 13
13.
Draw 2 water molecules. (You do NOT need to include the subatomic particles in the atoms.) In your drawing, label a hydrogen bond and a covalent bond.
3 points
3
Question 14
14.
Potassium oxide is a compound formed via ionic bonding between potassium (K) and oxygen (O) atoms. Demonstrate how this ionic compound forms. You only need to include the electrons in your atoms.
4 points
4
Question 15
15.
Organic chemistry studies carbon-based molecules. Due to its atomic structure, carbon atoms form the base of many large, complex molecules. In the space below, draw a carbon atom. Then, explain why carbon is an important atom in creating large molecules, such as the one shown below.