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3 years ago

Write an expression for "7 less than y."

Chemistry

2 answers:

fenix001 [56]3 years ago

7 0

Your answer is:

7-y

Why?

You're subtracting 7 from y. 'less' stands for subtracting.

<h3>Hope this helps! C:</h3>

victus00 [196]3 years ago

4 0

Answer:

y-7

Explanation:

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The Ksp of CaF2 is 4.0 x 10-11. What is the solubility of CaF2 in 0.10 M Ca(NO3)2? Give your answer using scientific notation an

Ilya [14]

Answer:

$1.0\times 10^{-5} M$ is the solubility of $CaF_2$ in 0.10 M $Ca(NO_3)_2$ .

Explanation:

Concentration of calcium nitrate = $[Ca(NO_3)_2]=0.10 M$

$Ca(NO_3)_2\rightarrow Ca^{2+}+2NO_3^{-}$

$[Ca(NO_3)_2]=0.10 M=[Ca^{2+}]$

Solubility product of the calcium fluoride = $K_{sp}=4.0\times 10^{-11}$

Solubility of calcium fluoride in calcium nitrate solution :

$CaF_2\rightleftharpoons Ca^{2+}+2F^-$

(0.10+S) (2S)

The expression of solubility is given by :

$K_{sp}=[Ca^{2+}][F^-]^2$

$4.0\times 10^{-11}=(S+0.10)(2S)^2$

Solving for S:

$S=1.0\times 10^{-5} M$

$1.0\times 10^{-5} M$ is the solubility of $CaF_2$ in 0.10 M $Ca(NO_3)_2$ .

3 0

3 years ago

Based upon the valence electrons as taken from the periodic table, the formula for rubidium (Rb) chloride (Cl) is:

kati45 [8]

Rubidium (Rb) is in group 1, so it has a valence charge of +1.
Chlorine (Cl) is in group 17 or the halogens, so it has a valence charge of -1.

Since both elements have the same valence charges, just of opposite signs, this means that only 1 atom of each element is needed to create a stable bond. The formula for rubidium chloride will be RbCl.

7 0

4 years ago

A weather balloon was initially at a pressure of 0.900 atm, and its volume was 35.0 L. The pressure decreased to 0.750 atm, with

marusya05 [52]

Boyle's Law

P₁V₁=P₂V₂

0.9 x 35 = 0.75 x V₂

V₂ = 42 L

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2 years ago

f an atom has 3 electrons outside of its nucleus, which combination of protons and neutrons would result in a neutral atom

cricket20 [7]

The answer to your question is two protons and two neutrons.

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4 years ago

2 Humans reproduce by cell division. True False

Varvara68 [4.7K]

Answer:

False

Explanation:

Single-celled organisms use cell division as their method of reproduction. Humans are not single celled, we are multicellular, therefore this conclusion is incorrect.

Hope this helps :)

8 0

2 years ago