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3 years ago

15

Suppose you have an unknown mineral sample. You can scratch the mineral with a pen knife but not with your fingernail. The miner

al is most likely _____.

1 answer:

Lynna [10]3 years ago

8 0

Are there options to choose from? It could be apatite

You might be interested in

In the reaction MgCl2 + 2KOH Mg(OH)2+ 2KCI, if 3 moles MgCh are added to 4 moles KOH, what determines how much Mg(OH)2 is made?

gulaghasi [49]

Answer:-

KOH determines how much Mg(OH)2 is made.

2 mol of Mg(OH)2 formed

Explanation:-

The balanced equation is

MgCl2 + 2KOH --> Mg(OH)2+ 2KCI,

From seeing the coefficients we notice

2 mol of KOH reacts with 1 mol of MgCl2

4 mol of KOH reacts with 1 x 4 / 2 = 2 mol of MgCl2

3 moles of MgCl2 was added but only 2 mol react.

So we see there is excess MgCl2 .

Hence KOH is the limiting reactant.

So KOH determines how much Mg(OH)2 is made.

We see from the balanced chemical equation,

2 mol of KOH gives 1 mol of Mg(OH)2.

4 mol of KOH will give 1 x 4 /2 = 2 mol of Mg(OH)2.

7 0

3 years ago

Alll moving objects have energy of _________

Natasha_Volkova [10]

All moving objects have kinetic energy.

Kinetic energy is the energy of motion, therefore if an object is moving it has kinetic energy.

3 0

3 years ago

What is the equilibrium constant of 2H, 0 = 2H2 +0,?

AlexFokin [52]

Answer:

K = [H₂]² [ O₂] / [H₂O]²

Explanation:

The equilibrium constant of any reaction can be written as,

K = [product]/ [reactant]

For given reaction:

Chemical equation:

2H₂O → 2H₂ + O₂

equilibrium constant:

K = [H₂] [ O₂] / [H₂O]

In stoichiometric calculations, we will put the coefficient of balanced equation in given equilibrium constant equation.

K = [H₂]² [ O₂] / [H₂O]²

6 0

4 years ago

WILL GIVE BRAINLIEST!!!

alekssr [168]

Answer: Temperature and number of moles are the conditions which remain constant in Boyle's law.

Explanation:

Boyle's law states that at constant temperature the pressure of a gas is inversely proportional to the volume of gas.

Mathematically, it is represented as follows.

$P \propto \frac{1}{V}$

As equation for ideal gas is as follows.

PV = nRT

And, at constant temperature the pressure is inversely proportional to volume which also means that number of moles are also constant in Boyle's law.

Thus, we can conclude that temperature and number of moles are the conditions which remain constant in Boyle's law.

5 0

3 years ago

How many grams of Fe are needed to create 32.5mol Fe3O4?

Mademuasel [1]

Answer:

5444.89 grams of Fe

Explanation:

1) We need the chemical equation for Fe3O4 to find the mole ratio for Fe to Fe3O4. Chemical equation:

3Fe+4H2O → Fe3O4+4H2

The mole ratio of Fe to Fe3O4 is 3:1

2) Now, we find how many grams of Fe are needed to produce 32.5 moles of Fe3O4.

$32.5 moles Fe3O4$ $x \frac{4 mole O}{1 mole Fe3O4}$ = 97.5 moles Fe needed to produce 32.5 moles of Fe3O4

3) Convert 97.5 moles of Fe into grams. The molar mass of Fe is 55.845g.

$97.5 mole Fe$ $x\frac{55.845g Fe}{1 mole Fe}$ = 5444.8875g or 5444.89g.

5 0

3 years ago