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abruzzese [7]
3 years ago
6

A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on t

he technique used? (4 points)
a It was a pure substance.
b It was a compound.
c It was a heterogeneous mixture.
d It was a homogeneous mixture
Chemistry
2 answers:
Anni [7]3 years ago
7 0

Answer:

b It was a compound.

Explanation:

<em>A chemical reaction was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used? </em>

<em>a It was a pure substance.</em>  NO. If the pure substance is a compound, this option could be. However, if the pure substance is a simple substance, it could not be separated into its components.

<em>b It was a compound. </em> YES. Compounds can be separated into pure substances using chemical reactions. For instance, H₂O → H₂ + 1/2 O₂

<em>c It was a heterogeneous mixture.</em>  NO. Heterogeneous mixtures can be separated into homogeneous mixtures using physical processes such as sieving, filtration, etc.

<em>d It was a homogeneous mixture.</em> NO. Homogeneous mixtures can be separated into pure substances using physical processes such as distillation, chromatography, etc.

frez [133]3 years ago
3 0

It is A I took a test just like this yesterday.

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Their atomic number
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When carbon undergoes sp2 hybridization it forms methane ? I believe.

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14. In the lab, an experimenter mixes 75.0 g of water (initially at 30oC) with 83.8 g of a solid metal (initially at 600oC). At
avanturin [10]

Answer:

Tungsten is used for this experiment

Explanation:

This is a Thermal - equilibrium situation. we can use the equation.

Loss of Heat of the Metal = Gain of Heat by the Water

                      -Q_{m}=+Q_{w}\\

                    Q = mΔTC_{p}

Q = heat

m = mass

ΔT = T₂ - T₁

T₂ = final temperature

T₁ = Initial temperature

Cp = Specific heat capacity

<u>Metal</u>

m = 83.8 g

T₂ = 50⁰C

T₁ = 600⁰C

Cp = x

<u>Water</u>

m = 75 g

T₂ = 50⁰C

T₁ = 30⁰C

Cp = 4.184 j.g⁻¹.⁰c⁻¹

               -Q_{m}=+Q_{w}\\

⇒ - 83.8 x x x (50 - 600) = 75 x 4.184 x (50 - 30)

⇒ x = \frac{6276}{46090} = 0.13 j.g⁻¹.⁰c⁻¹

We know specific heat capacity of Tungsten = 0.134 j.g⁻¹.⁰c⁻¹

So metal Tungsten used in this experiment

8 0
3 years ago
What does E=mc^2 mean
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E represents units of energy, m represents units of mass, and c2 is the speed of light squared, or multiplied by itself


So I THINK that A is the right answer but i may be wrong.


I hope this helped :)

8 0
3 years ago
An unknown diprotic acid (H2A) requires 44.391 mL of 0.111 M NaOH to completely neutralize a 0.58 g sample. Calculate the approx
Anna [14]

Answer:

M=235.42g/mol

Explanation:

Hello!

In this case, given this is an acid-base neutralization and we are considering a diprotic acid, we can write the following mole-mole relationship:

2n_{acid}=n_{base}

It means that the moles of acid can be computed given the volume and concentration of NaOH:

n_{acid}=\frac{M_{base}V_{base}}{2} =\frac{0.044391L*0.111mol/L}{2} \\\\n_{acid}=2.46x10^{-4}mol

It means that the approximate molar mass of the acid is:

M=\frac{m_{acid}}{n_{acid}} \\\\M=\frac{m_{acid}}{n_{acid}} =\frac{0.58g}{2.46x10^{-3}mol}\\\\M=235.42g/mol

Best regards!

5 0
2 years ago
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