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4 years ago

In which reaction is precipitation occurring?

Chemistry

1 answer:

Trava [24]4 years ago

7 0

Answer:- B. $CdSO_4(aq)+K_2S(aq)\rightarrow CdS(s)+K_2SO_4(aq)$

Explanations:- A precipitation reaction is a double displacement reaction in which a solid salt is formed.

If we look at all the given equations then it's only second reaction in which a solid salt (CdS) is formed. In rest of the reactions there is no solid salt formed.

It means A, C and D are not the right choices and so the correct choice is only B.

Here the phase are given for all the products. If the phases are not given then we use the solubility chart to see which reactions would form the precipitate.

Since, the precipitate is formed only in second equation, the correct choice is B.

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In a combustion experiment, it was found that 12.096 g of hydrogen molecules combined with 96.000 g of oxygen molecules to form

Mkey [24]

The mass change, or the mass defect, can be calculated by the formula that is very known to be associated with Albert Einstein.

E = Δmc²
where
E is the energy gained or released during the reaction
c is the speed of light equal to 3×10⁸ m/s
Δm is the mass change

(1.715×10³ kJ)(1,000 J/1 kJ) = Δm(3×10⁸ m/s)²
Δm = 1.91×10⁻¹¹ kg

5 0

3 years ago

A sample of an unknown biochemical compound is found to have a percent composition of 45.46 percent carbon, 7.63 percent hydroge

Leona [35]

Answer:

Formular = C₅H₁₁NO₃

Explanation:

The empirical formular is the simplest formular of a compound can have.

We use the steps below to obtain the empirical formular;

Step 1: Obtain the mass of each element present in grams. Element % = mass in g = m.

Carbon = 45.46% = 45.46g

Hydrogen = 7.63% = 7.63g

Nitrogen = 10% = 10g

Oxygen = 100% - (45.46% + 7.63% + 10%) = 36.31% = 36.31g

Step 2: Determine the number of moles of each type of atom present.

Molar amount (M) = m/atomic mass

Carbon = 45.46 / 12 = 3.7883

Hydrogen = 7.63 / 1 = 7.63

Nitrogen = 10 / 14 = 0.7143

Oxygen = 36.91 / 16 = 2.3069

Step 3: Divide the number of moles of each element by the smallest number of moles. Smallest = 0.7143

Carbon = 3.7883 / 0.7143 = 5.3035

Hydrogen = 7.63 / 0.7143 = 10.67

Nitrogen = 0.7143 / 0.7143 = 1

Oxygen = 2.2693 / 0.7143 = 3.1770

Step 4: Convert numbers to whole numbers

Carbon = 5

Hydrogen = 11

Nitrogen = 1

Oxygen = 3

Formular = C₅H₁₁NO₃

3 0

4 years ago

if you take a dried out white rose and place the stem in food coloring, will the rose turn the color you put the stem in

cricket20 [7]

Answer:

Yes, this is true. The reason is that the flower transpires and sucks the water in and distributes it as much as it can. You can also flip it upside down and hang it with petals down , allowing the liquid to enter the flower and then retaining color for longer periods of time and having more color.

Explanation:

7 0

3 years ago

How many formula units are 113.5 grams of Ca(OH)2

Sav [38]

Answer:

Molecular Formula Ca(OH)2 or CaH2O2

Synonyms CALCIUM HYDROXIDE 1305-62-0 Slaked lime Hydrated lime Ca(OH)2

Molecular Weight 74.09 g/mol

Component Compounds CID 962 (Water) CID 5460341 (Calcium)

Explanation:

8 0

3 years ago

Outline the two main observations that led Wegener to propose the theory of continental drift.

ArbitrLikvidat [17]

Answer:

for continental drift included the fit of the continents; the distribution of ancient fossils, rocks, and mountain ranges; and the locations of ancient climatic zone

Explanation:

8 0

3 years ago