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3 years ago

First to answer correctly gets brainleist

Chemistry

1 answer:

Brums [2.3K]3 years ago

6 0

When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. It could be A I’m not sure if this helps.

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A Beer's Law Plot of sample A gives a slope equal to 1.2 M-1cm-1. Calculate molar concentration of this sample at a wavelength o

Rashid [163]

Answer:

$0.192\ \text{M}$

Explanation:

A = Absorbance of solution

E = Molar absorptivity

l = Length of cuvette = 1 cm

c = Concentration of solution

Beer's law is given by

$A=Elc$

The equation of a straight line is given by

$y=mx+c$

Comparing the above equations we get

Value on $y$ axis = A = Absorbance of solution = 0.23

$m$ = Slope of line = El = Molar absorptivity multiplied with length = $1.2\times 1\ \text{M}^{-1}$

$x$ = Value of x axis = c = Concentration of solution

So we get

$c=\dfrac{A}{El}\\\Rightarrow c=\dfrac{0.23}{1.2\times 1}\\\Rightarrow c=0.192\ \text{M}$

The molar concentration of the sample is $0.192\ \text{M}$

5 0

3 years ago

If a photon dropping from the n = 7 to the n = 1 level hit the surface of Au, what would be the wavelength of the ejected electr

Alex787 [66]

Answer:

here's the answer.hope it helps

5 0

3 years ago

The compound cobalt (II) sulfate forms a hydrate with seven water molecules per formula unit. What are the name and formula of t

irina [24]

Answer: The formula of the hydrate will be $CuSO_4.7H_2O$ and the name of the compound is copper sulphate heptahydrate.

Explanation:

Water of crystallisation is the number of water molecules that combine chemically in definite molecular proportion with the concerned salt in the crystalline state.

The formula of the hydrate will be $CuSO_4.7H_2O$ and the name of the compound is copper (II) sulphate heptahydrate as there are 7 molecules of water.

7 0

3 years ago

Suppose a powerful battery is connected between a pair of inert graphite electrodes dipped into a pot of molten zinc chloride (s

zvonat [6]

The electrode A is a cathode. This is because it is negatively charged electrode and it attracts cations, or we can say it is positively charged.
The reaction occurs at the cathode
Zn2+ +2e⇒Zn
Anode reaction is
2CL- ⇒CL2+2e-
The overall reaction will be Zncl2(l) which completely disassociates then it is zn∧2+(l)+2cl∧-(l).

3 0

3 years ago

According to the law of conservation of matter, we know that the total number of atoms does not change in a chemical reaction an

Anna71 [15]

Answer:

the answer is second option. with 2 models

Explanation:

2H2 + O2 gives 2H2O

so there's two models

7 0

3 years ago

Read 2 more answers