3 years ago

We use the periodic table to determine a mineral’s hardness true or false

Chemistry

2 answers:

Ray Of Light [21]3 years ago

6 0

False we use it to determine what type of element it is as well as the atomic mass and number

Bas_tet [7]3 years ago

3 0

False we use it to detirmine the reactivitys and what groups they are in

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what is the pH of a solution prepared from solid, neutral 2-nitrophenol providing a fromal concentration of 0.0353M, given that

REY [17]

Answer:

pH = 4.34

Explanation:

pH= -1/2(logKa) -1/2(log C)

= -1/2( log 5.98*10^-8) -1/2(log 0.0353)

=-1/2(-7.22)-1/2(-1.45)

=3.61+0.725= 4.34

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2 years ago

Which of the following is NOT true about nuclear fusion?

inysia [295]

<u>Answer:</u>

I think it's (C)

The products are suitable for making nuclear weapons.

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How much does the mass of 12.65-g sample of copper(II) nitrate hexahydrate decrease when heated?

garik1379 [7]

There is 103 percent of water in hydrate

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2 years ago

How many 20.0-g ice cubes are required to absorb 47.0 kJ from a glass of water upon melting?

Sati [7]

Hello!

The number of 20-g ice cubes required to absorb 47 kJ from a glass of water upon melting is 7 icecubes

Why?

We are going to clear from the equation of the released heat, the mass of ice (m). The specific latent heat of fusion of ice is 336 kJ/kg:

$Q=m*L\\ \\ m=\frac{Q}{L}=\frac{47 kJ}{336 kJ/kg}=0,1399 kg=139,88 g\\ \\ 139,88g*\frac{1 icecube}{20g}=6,99=7icecubes$

So, 7 ice cubes are required to absorb that amount of heat from the glass of water.

Have a nice day!

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3 years ago