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melamori03 [73]
3 years ago
9

How many valence electrons does each of the following atoms have?

Chemistry
1 answer:
Zolol [24]3 years ago
6 0
Which atoms?  ~~~~~~~~~~~~~~~~~~~~~~~~~`
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What is the gram-formula mass of Fe(NO3)3?
dusya [7]
M Fe = 55,85g ≈ 56g
m O = 16g
m N = 14g
m Fe(NO3)3 = 56g + 3*14g + 3*3*16g = 242g/mol

answer: (4)
8 0
3 years ago
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A scientist put red blood cells in water that contained salt. Over time, the red blood cells burst. What is most likely true?
Tamiku [17]

Answer: There was a lower concentration of salt in the water than in the cells.

Explanation:

Osmosis is a process in which the solvent flow from a solution of low concentration to a solution of high concentration through a semi-permeable membrane.  

When the red blood cells are put in water that contained salt and the red blood cells burst after some time.

This means the solvent has moved from outside to inside the cell and this is possible only when the concentration of solute is high inside the cell than outside. That means the solution has low concentration of solute as compared to the cell and was a hypotonic solution.

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3 years ago
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Which substance can not be decomposed by a chemical change?
slamgirl [31]
The answer is (2) Copper. Because copper is consist of atom. If it is decomposed, the atom will be changed. While chemical change is just the break down and form of chemical bonds between atoms. 
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3 years ago
Which physical property of matter do these four objects have in common?
aleksandrvk [35]

Answer:

A- Non-magnetic

Explanation:

Brass, rubber, plastic, and glass will not be attracted by a magnet.

4 0
3 years ago
Express 749 000 000 in scientific notation,
Dima020 [189]

Answer:

7.49 × 108

Explanation:

Scientific notation is a way to express numbers in a form that makes numbers that are too small or too large more convenient to write. It is commonly used in mathematics, engineering, and science, as it can help simplify arithmetic operations. In scientific notation, numbers are written as a base, b, referred to as the significant, multiplied by 10 raised to an integer exponent, n, which is referred to as the order of magnitude:

8 0
3 years ago
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