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3 years ago

What physical properties would a pencil lead have

1 answer:

8 0

Some physical properties that a pencil would have is, color, density, texture, hardness (in this case the lead is soft). phase (liquid,solid gas), shape, size. physical properties describe the look and feel of a substance. I hope this helps

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Evidence of a chemical change does NOT include

horrorfan [7]

C is the correct answer for this question. since it is a physical change

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3 years ago

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WHAT IS THE ATOMIC NO OF RUBINIUM[RB]

Zinaida [17]

Rubidium's atomic number is 37.

Hope this helps!

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3 years ago

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Travka [436]

♥ In fact, the similarity of the numbers 85,19,17,4&2 is <span>that they are all divisors of 6460.
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4 0

3 years ago

MASS = 10 Kg, Acceleration = 3 m/s/s, Force =

Orlov [11]

Answer:

The force is 30 N

Explanation:

We use the formula F= mx a

F= 10kg x 3m/s2

F= 30kgxm/s2= 30 Newton

7 0

3 years ago

Consider the dissolution of AB(s): AB(s)⇌A+(aq)+B−(aq) Le Châtelier's principle tells us that an increase in either [A+] or [B−]

Arlecino [84]

Answer:

A. 0.000128 M is the solubility of M(OH)2 in pure water.

B. $3.23\times 10^{-6} M$ is the solubility of $M(OH)_2$ in a 0.202 M solution of $M(NO_3)_2$ .

Explanation:

Solubility product of generic metal hydroxide = $K_{sp}=8.45\times 10^{-12}$

$M(OH)_2\rightleftharpoons M^{2+}+2OH^-$

S 2S

The expression of a solubility product is given by :

$K_{sp}=[M^{2+}][OH^-]^2$

$K_{sp}=S\times (2S)^2=4S^3$

$8.45\times 10^{-12}=4S^3$

Solving for S:

$S=0.000128 M$

0.000128 M is the solubility of M(OH)2 in pure water

Concentration of $M(NO_3)_2$ = 0.202 M

Solubility product of generic metal hydroxide = $K_{sp}=8.45\times 10^{-12}$

$M(OH)_2\rightleftharpoons M^{2+}+2OH^-$

S 2S

So, $[M^{2+}]=0.202 M+S$

The expression of a solubility product is given by :

$K_{sp}=[M^{2+}][OH^-]^2$

$8.45\times 10^{-12}=(0.202 M+S)(2S)^2$

Solving for S:

$S=3.23\times 10^{-6} M$

$3.23\times 10^{-6} M$ is the solubility of $M(OH)_2$ in a 0.202 M solution of $M(NO_3)_2$ .

8 0

4 years ago