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3 years ago

Which of the following groups of materials would

Chemistry

2 answers:

qwelly [4]3 years ago

8 0

Answer:

Explanation:

Nikitich [7]3 years ago

4 0

The wrong answers for sure are B and D, I assume the answer is C

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What does an atom contain?

netineya [11]

Answer:

neutron, proton, and electrons

Explanation:

The protons and the neutrons make up the center of an atom which is called the nucleus

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3 years ago

Why is digestion a necessary process for animals?

ser-zykov [4K]

So they can produce energy for themselves
Hope I helped!
~ Zoe

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3 years ago

2.44 × 10–2 m by 1.4 × 10–3 m by 8.4 × 10–3 m

e-lub [12.9K]

<span>2.44 × 10–2 m by 1.4 × 10–3 m by 8.4 × 10–3 m
</span>

2.9 x 10-7 m3

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3 years ago

Which has a lower freezing point oxygen or ethonal

notka56 [123]

Answer:

Ethanol

Explanation:

7 0

3 years ago

The plot shows the absorbance spectra for solutions of caffeine, benzoic acid, and Mountain Dew® soda, each in 0.010 M HCl . A p

Aliun [14]

Complete Question

The diagram of the complete question is shown on the first uploaded image.

Answer:

a) The approximate absorbance of benzoic acid at 228 nm? : A = 0.8

b) The molar absorptivity(∈)

of benzoic acid at 228 nm? : ∈ = $1.12 * 10^{4} M^{-1} cm^{-1}$

Explanation:

Looking at the absorbance spectra, we can see that the approximate absorbance of benzoic acid at 228 is 0.8.

mass concentration of benzoic acid = $8.74 \frac{mg}{L} =8.74 * 10^{-3} \frac{g}{L}$

the molar concentration of benzoic acid = (mass concentration of benzoic acid) / (molar mass of benzoic acid )

molar concentration of benzoic acid = $(8.74 *10^{-3} \frac{g}{L} ) /(122.12\frac{g}{mol} )$

molar concentration of benzoic acid = $7.157 * 10^{-5}M$

molar absorptivity (∈) of benzoic acid = (absorbance) /[ (molar concentration of benzoic acid ) × (path length) ]

∈ = (0.8) / [ ( $7.157 *10^{-5}M$ ) ×(1.00 cm)]

= $1.12 * 10^{4} M^{-1} cm^{-1}$

5 0

3 years ago