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natita [175]
3 years ago
12

Elements are placed in the same column of the periodic table because they share the same number of valance electrons. Please sel

ect the best answer from the choices provided T F
Chemistry
2 answers:
salantis [7]3 years ago
7 0
I believe that is true
Elis [28]3 years ago
7 0

Answer:

True

Explanation:

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A chemist needs to know the mass of a sample of to significant digits. She puts the sample on a digital scale. This is what the
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Answer:

No solution

Explanation:

This is only 4 sig digits  

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2 years ago
What is hydrolysis?​
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Hydrolysis is any chemical reaction in which a molecule of water ruptures one or more chemical bonds.

Explanation:

Example:

Dissolving a salt of a weak acid or base in water is an example of a hydrolysis.

8 0
4 years ago
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3 complete paragraphs on Static Electricity
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4 0
3 years ago
Whats the length of an aluminum rod at 65 c if its length at 15 c is 1.2 meters
Furkat [3]
15c - 1.2m
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65c - 5.2m
4 0
4 years ago
The density of an unknown gas at 98°C and 740 mmHg is 2.50 g/L. What is the molar mass of the gas with work showed?
noname [10]

Answer:

78.2 g/mol  

Step-by-step explanation:

We can use the <em>Ideal Gas Law</em> to solve this problem:

       pV = nRT

Since n = m/M, the equation becomes

      pV = (m/M)RT     Multiply each side by M

   pVM = mRT               Divide each side by pV

        M = (mRT)/(pV)

Data:

ρ = 2.50 g/L

R = 0.082 16 L·atm·K⁻¹mol⁻¹

T =98 °C

p = 740 mmHg

Calculation:

(a)<em> Convert temperature to kelvins </em>

T = (98 + 273.15) = 371.15 K

(b) <em>Convert pressure to atmospheres </em>

p = 740 × 1/760 =0.9737 atm

(c) <em>Calculate the molar mass </em>

Assume V = 1 L.

   Then m = 2.50 g

            M = (2.50 × 0.082 06 × 371.15)/(0.9737 × 1)

                = 76.14/0.9737

                = 78.2 g/mol

3 0
3 years ago
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