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3 years ago

What is the main purpose of a scientific investigation

Chemistry

2 answers:

lilavasa [31]3 years ago

7 0

Answer:

scientific investigation is the quest to find an answer to a question using scientific method.

Explanation:

bonufazy [111]3 years ago

3 0

To find a scientific answer

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What is a mineral phase change?

anyanavicka [17]

<span>A mineral phase change involves the action of a mineral changing physical form. This can involve changing from a solid to a liquid, changing in to a gas form, etc. This phenomenon may sometimes be referred to as metamorphism.</span>

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3 years ago

What is the volume, in liters, of 6.8 mol of Kr gas at STP?

Virty [35]

Answer:

$\boxed {\boxed {\sf D. \ 152 \ L}}$

Explanation:

Any gas at standard temperature and pressure (STP) has a volume of 22.4 liters per mole or 22.4 L/mol. We can create a proportion with this value.

$\frac {22.4 \ L \ Kr}{1 \ mol \ Kr}$

Multiply both sides of the equation by 6.8 moles of krypton.

$6.8 \ mol \ Kr *\frac {22.4 \ L \ Kr}{1 \ mol \ Kr}$

The units of moles of krypton will cancel.

$6.8 *\frac {22.4 \ L \ Kr}{1 }$

The denominator of 1 can be ignored, so this becomes a simple multiplication problem.

$68 * 22.4 \ L \ Kr$

$152.32 \ L \ Kr$

If we round to the nearest whole number, the 3 in the tenths place tells us to leave the 2 in the ones place.

$152 \ L \ Kr$

6.8 moles of krypton gas at standard temperature and pressure is equal to <u>152 liters</u>.

6 0

3 years ago

The nucleus is positive in charge because it contains what?

a_sh-v [17]

Answer:

the nucleus is positive because it contains protons

5 0

3 years ago

how many moles of solute are contained in 500.00 milliliter solution that has a concentration of 0.35M

igomit [66]

1.75 moles of Solute or 1.75n.

To find this, you'll need to use the molarity equation which is M = $\frac{n}{v}$

List the given items to organize better:

M (Molarity) = .35

V (Volume) = 5L [must always be in Liters]

n (Moles) = ?

Now, for the equation, substitute the variables with the given numbers:

.35 = $\frac{n}{5}$

Isolate the variable by multiplying the volume, 5, onto both sides. This will give you the answer of:

1.75 = n

Hope this helps!

6 0

3 years ago

For the reaction N2 + 3H2 = 2NH3, if you have 2.00 moles of N2 and 4.00 moles of H2 : a. Identify the limiting reactant. _______

EastWind [94]

Answer:

The answer to your question is below

Explanation:

For the reaction N2 + 3H2 = 2NH3, if you have 2.00 moles of N2 and 4.00 moles of H2 : a. Identify the limiting reactant. ____________

N2 + 3H2 = 2NH3

1 mol 3 moles 2 moles

Given 2 moles 4 moles

Rule of three for N2

x = (2 x 3) / 1 = 6 mol of H2, it means that is needed 6 moles of H2 and there are only 4, so the limiting reactant is H2

b. How many moles of NH3 can be formed? ____________

rule of three

3 moles of H2 --------------------- 2 moles of NH3

4 moles of H2 --------------------- x

x = (4x2)/3 = 2.7 moles of NH3 are formed

c. How many moles of the excess reactant will remain? _________

x = (4 x 1) / 3 = 1.33

Excess reactant = 2 - 1.33 = 0.67 moles

5 0

4 years ago