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djverab [1.8K]
3 years ago
5

23. Using the periodic table, what is the oxidation number of:

Chemistry
1 answer:
Aloiza [94]3 years ago
8 0

Answer:

a. +2

b. +3

c. -1

Explanation:

The typical oxidation states can be determined from the periodic table based on the number of valence electrons an atom has.

a. Calcium belongs to group 2A, meaning it has 2 valence electrons and, therefore, would have an oxidation state of +2 in compounds.

b. Aluminum is in group 3A, meaning it has 3 valence electrons and would have an oxidation state of +3 in compounds when the 3 electrons are lost.

c. Fluorine would become fluorine if it gained 1 additional electron to achieve an octet, so its oxidation state would be -1.

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Based on the equations below, which metal is the least active? Pb(NO3)2(aq) + Ni (s) --> Ni(NO3)2 (aq)+ Pb(s) Pb(NO3)2(aq) +
viva [34]

Answer:

Ni

Explanation:

An active metal is a highly reactive metal. Active metals are found high up in the activity series.

Active metals react with other metals that are lower than them in the activity thereby displacing the lower metals from a solution of their salts. This is what may have happened in the other two reactions.

Ni is the most active metal listed in the question since it can react a compounds with Pb(NO3)2(aq) to liberate Pb metal.

6 0
2 years ago
Which of the following groups of subjects are categorized under natural science?
Lesechka [4]

Answer:

i guess b is the answer.hope it will help

8 0
3 years ago
Read 2 more answers
What is the molarity of a solution made by dissolving 20.0 g of H3PO4 in 50.0 mL of solution
Rom4ik [11]
(20*1000)÷(molecular weight of H3po4*50)

8 0
3 years ago
A loaded coal wagon with a total mass of 20 000 kg is pushed by a force of 300 000 N. What was the wagon’s acceleration?
AlexFokin [52]

Answer:

<h2>15 m/s²</h2>

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

a =  \frac{f}{m}  \\

f is the force

m is the mass

From the question we have

a =  \frac{300000}{20000}  =  \frac{30}{2}  \\

We have the final answer as

<h3>15 m/s²</h3>

Hope this helps you

5 0
3 years ago
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REY [17]
6 Carbon atoms
18 Oxygen atoms
12 Hydrogen atoms
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3 years ago
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