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Alexxx [7]
3 years ago
7

What rock has a hardness of 4,and has a dull luster. What is it?

Chemistry
1 answer:
gogolik [260]3 years ago
5 0

Answer:

Fluorite

Explanation:

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Round off 318.90 to 2 significant figures
motikmotik

Answer:

320

Explanation:

Because the question is asking for 2 significant figures, you want to try to get rid of all of the numbers to the right of the 1. That way, the only numbers that will be significant are the numbers in the position of the 3 and the 1.

Before you can make the rest of the numbers equal 0, you need to correctly round the number in the last significant position (the number 1).

If the number to the right of the 1 is from 0-4, the number stays the same. If the number is from 5-9, the 1 needs to be increased by a unit.

Since the number to the right is an 8, you need to change the 1 to a 2. Now, you can make all of the other numbers a 0. There should be no decimal place because it would mean that the zero to the left of it is significant.

6 0
2 years ago
1 What characteristic of an element determines how its atoms can bond with other<br> atoms?
Masja [62]

Answer:

Electrons

Explanation:

The electrons of the outermost energy level determine the energetic stability of the atom and its tendency to form chemical bonds with other atoms to form molecules. Under standard conditions, atoms fill the inner shells first, often resulting in a variable number of electrons in the outermost shell.

8 0
3 years ago
When a neutral atom loses an electron, it forms an ion with a positive charge called a _________? Question 1 options:
Black_prince [1.1K]
It should be C) cation
8 0
3 years ago
Read 2 more answers
A 25.0-mL sample of 0.100M Ba(OH)2(aq) is titrated with 0.125 M HCl(aq).
morpeh [17]

Answer:

20.0

Explanation:

NaOH = (25.0) (0.100m) \ 0.125M = 20.0mL

8 0
3 years ago
If a house viewed through infrared goggles ,where would the most seen
Serjik [45]

Answer:

The answer is D - near the roof.

Explanation:

Attics don't have a ton of insulation or hard cinder-block to block the goggles form seeing through it. This is why the attic can be a place where the temperature varies with the outside temperature.

5 0
3 years ago
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