3 years ago

All of them please!!!! Please help me

Chemistry

1 answer:

Rina8888 [55]3 years ago

5 0

I think 1 is b 2 is d 3 is a 4 is d 5 is b 6 is c and 7 is b I hope my awnsers helped .

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Q.Can anyone explain the influence of soil solution pH on the nutrient availability of essential nutrients?

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Answer:

pH Affects Nutrients, Minerals and GrowthBefore

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3 years ago

The temperature of 100 g of liquid water in a calorimeter changes from 25°C to 50°C. How much heat was transferred? Use the equa

Lilit [14]

I belive it is 10.45, i have the same question

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3 years ago

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4 Au(s) + 8 NaCN(aq) + O2(g) + 2 H2O(ℓ) → 4 NaAu(CN)2(aq) + 4 NaOH(aq) (2) 2 NaAu(CN)2(aq) + Zn(s) → 2 Au(s) +Na2[Zn(CN)4](aq) I

marysya [2.9K]

Answer:

72.57 grams

Explanation:

The mass percentage of gold in the ore is 0.19 %

The mass of ore used = 23 kg

The mass of gold in the ore = $\frac{0.19X23}{100}=0.0437kg$

moles of gold in the given mass of ore = $\frac{mass}{Atomic mass}=\frac{0.437X1000}{197}=2.22mol$

As per given equation four moles of Au is giving four moles of complex compound on reacting with NaCN

Then in second reaction two moles of the complex is reacting with one mole of Zinc

Thus two moles of gold are reacting with one mole of Zinc

The moles of Zinc needed = 0.5 X 2.22 mol = 1.11 moles

The mass of Zinc needed = moles X atomic mass =1.11 X 65.38 = 72.57 grams

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3 years ago

Jeff has 10 grams of water and 10 grams of vegetable oil in separate containers. both liquids have a temperature of 24°c. jeff h

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ANSWER: From this experiment, Jeff can conclude that the heat capacity of oil is lower than that of water which means that oil requires less energy per gram of liquid in order to change its temperature.

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2 years ago

Which statement below describes an atomic emission spectra?

xxTIMURxx [149]

ANSWER- B

Atomic emission spectra are produced when excited electrons return to the ground state. The emitted light corresponds to energies of the specific electrons.

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3 years ago

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