All categories

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

You might be interested in

Calculate the value of Key in the following reaction if the equilibrium concentrations are

MAXImum [283]

Answer:

The value of the equilibrium constant Kc is 5.45

Explanation:

The "Law of Mass Action" states:

"For a reversible reaction in chemical equilibrium at a given temperature, it is true that the product of the concentrations of the products raised to the stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients is a constant."

This constant was called the equilibrium constant. For a reaction:

aA + bB ⇄ cC + dD

the equilibrium constant Kc is:

$Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }$

In this case, the balanced reaction is:

2 H₂S → 2 H₂ + S₂

So, the equilibrium constant Kc is:

$Kc=\frac{[H_{2} ]^{2} *[S_{2} ] }{[H_{2} S]^{2} }$

The equilibrium concentrations are

[H₂S] =0.25 M
[H₂]= 0.88 M
[S₂]= 0.44M

Replacing in the definition of equilibrium constant:

$Kc=\frac{(0.88 M)^{2} *0.44 M }{(0.25 M)^{2} }$

Solving:

Kc= 5.45

The value of the equilibrium constant Kc is 5.45

7 0

2 years ago

Why is velocity mean always greater than the most probable velocity?

Ann [662]

Answer: I am unsure of what you mean.

Explanation:

Please explain better.

6 0

3 years ago

Pls answer no robots

IrinaVladis [17]

The dominant gene become one that had insulin and was dependent. And the ressesive became non insulin because those who had it could survive easier

5 0

2 years ago

Read 2 more answers

Describe light with respect to its speed and its dual nature as both a wave and a particle.

Sedbober [7]

Answer:

Scientists have been debating over light being a wave or particle since its recognition.

Sir Issac Newton discovered that light had frequency and other properties. Newton described light to be a particle because it created shadows which were sharp and very clear.

Francesco Maria Grimaldi, claimed that light was a wave. This was because this scientist observed the diffraction of light and hence, claimed light to be a type of wave.

The speed of light is 299 792 458 m / s. Nothing can travel faster than light.

5 0

3 years ago

Which of the following devices can measure only atmospheric pressure? A. Pressure gauge B. Mercury tube C. Tire gauge D. Baromet

kap26 [50]

D. Barometer. Hope this helps

4 0

3 years ago