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4 years ago

Why do different chemicals emit different colors of light, and why is the color emitted specific to that chemical?

1 answer:

7 0

<span>Every chemical is made up of atoms and each atom has one or more electrons surrounded its nucleus. The electron emits light after changing from a high energy state o to a lower energy state which is known as transition. The color of this light is unique to each element because each atom of a particular element has a different transition energy.</span>

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The temperature of a sample of iron with a mass of 10.0 g changed from 50.4°C to 25.0°C with the release of 47 calories of heat.

sleet_krkn [62]

This would be concidered a chemical reaction.

6 0

4 years ago

When 100. mL of 6.00 M HCl is diluted to 300. mL, the final concentration is ________.

Marat540 [252]

Answer:

2.00 M

Explanation:

The concentration of a solution is given by

$M=\frac{m}{V}$

where

m is the mass of solute

V is the volume of the solution

At the beginning, the solution has:

M = 6.00 M is the concentration

V = 100 mL = 0.1 L is the volume

So the mass of solute (HCl) is

$m=MV=(6.00)(0.1)=0.6g$

Then, the HCL is diluted into a solution with volume of

V = 300 mL = 0.3 L

Therefore, the final concentration is:

$M=\frac{m}{V}=\frac{0.6}{0.3}=2.00 M$

3 0

4 years ago

Read 2 more answers

I NEED HELP WITH ASAP!!

ivann1987 [24]

C. <span>High temperatures make the gas molecules move more quickly.
</span>

6 0

3 years ago

Complete and balance the molecular equation for the reaction of aqueous sodium carbonate, Na 2 CO 3 , and aqueous nickel(II) chl

pantera1 [17]

Answer:

NiCl2 (aq) + Na2CO3 (aq) ---> NiCO3 (s) + 2NaCl (aq)

Explanation:

Soluble ionic compounds exist as ions in solution.

Na 2CO3, will contain Na2CO3 (aq) --> 2Na ^+ (aq) + CO2 ^-3 (aq)

The same way, a solution of calcium chloride,

CaCl 2, will contain CaCl2 (aq) --> Ca2^+ (aq) + 2Cl^− (aq)

Mixing both solution, the calcium cations

Ca 2^+ , will apir up with the carbonate anions, CO2^−3 , and form the Insoluble calcium carbonate, CaCO ^3, which precipitates out of solution.

The complete ionic equation, which features all the ions that are present in solution, will be like this

2 Na^+ (aq) + CO2^−3 (aq) + Ca2^+ (aq) + 2Cl^− (aq) --> CaCO 3 ↓ (s) + 2Na^+ (aq) + 2Cl^− (aq)

Notice that you have two sodium cations and two chloride anions on the products' side, which is why you have 2NaCl

NiCl2 (aq) + Na2CO3 (aq) ---> NiCO3 (s) + 2NaCl (aq)

4 0

3 years ago

Can an object have both kinetic and potential energy? explain. um please help quick:(((

Alex Ar [27]

Answer:

Yes

Explanation:

An object can be above ground which would be potential energy, and be moving at the same which is kinetic energy.

7 0

4 years ago