Answer:
1. c. group 15
2. a. group 1
3. c. m
Explanation:
1. and 2. you just have to know the charge rules.
3. m = mass number = total protons and neutrons
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Atoms are considered the smallest particles of an element because they are the basic unit. They cannot be broken down into any smaller substance.
Answer: D
Explanation: As temperature increases, the solubility of a solid or liquid can increase or decrease depending on whether the dissolution reaction is exothermic or endothermic. In endothermic reactions, the net energy from the bonds breaking and forming results in heat energy being absorbed when the solute dissolves in solution.
Question 6
a) B
b) A
Question 7
a) Iron
b) oxygen, water
c) i) Galvanizing
ii) Painting
The number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.
<h3>How to calculate number of moles?</h3>
The number of moles in the formula units of a substance is calculated by dividing the formula unit by Avogadro's number.
According to this question, 3.20 x 10² formula units are in calcium iodide. The number of moles is as follows:
no of moles = 3.20 x 10²² ÷ 6.02 × 10²³
no of moles = 0.53 × 10-¹
no of moles = 0.053 moles
Therefore, the number of moles in 3.20 x 10² formula units of calcium iodide is 0.053 moles.
Learn more about number of moles at: brainly.com/question/12513822
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