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hodyreva [135]
3 years ago
5

2 Truths and 1 Lie: Universe Edition

Chemistry
1 answer:
AVprozaik [17]3 years ago
7 0
Idk good luck it’s one of these choices
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What occurs when a magnesium atom becomes a magnesium ion
Karo-lina-s [1.5K]
The electrons are lost.
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3 years ago
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Give the result of the following mathematical operations to the correct number of significant figures. 5.659 * (3.496 - 2.814) =
shtirl [24]

Answer:

The result is 3.859 in which we use four significant figures.

Explanation:

We start by solving the mathematical operation :

5.659.(3.496-2.814)=5.659(0.682)=3.859438

The result for the operation is 3.859438 but the numbers in the operation are given with four significant figures and that is why we are going to use four significant figures to express the result

To express 3.859438 with four significant figures we use the first four digits that appear from left to right starting by the first digit that is different to zero

In this case : 3.859 will be the result with four significant figures.

We also use a rule that says : To decide if the last significant figure remains the same we look for the value of the digit at its right.

If that number is greater than or equal to 5 ⇒ we sum one to the last significant figure

For example 3.859738 = 3.860 with four significant figures because the ''7'' is greater that 5

If that number is less than 5 ⇒ the last significant figure remains the same

In our case : 3.859438 = 3.859 because ''4'' is less than ''5''

7 0
3 years ago
16 Which two gases can not be broken down by chemical means?(1) CO and He (3) Xe and He
lyudmila [28]
The answer is (2) CO and NH3. The chemical reaction can only break down chemical bonds between atoms inside the molecule. The He and Xe is consists of one atom only, so they can not be broken down by chemical means.
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How is Earth's surface most likely to change in a cold place that experiences rainfall?
Ghella [55]

Answer:

I think the answer would have to be D

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Question 24 Multiple Choice Worth 2 points)<br> [BWS.02] Why is science important for society?
gulaghasi [49]

Answer:

Because the scientific knowledge itself helps solve many basic human needs and it also improves how humans live and their standards. For example, without science medications wouldn´t exist and many technological devices we use now-a-days. We´re surrounded by science, we just don´t really notice it.

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