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3 years ago

Classify each of the following chemical reaction (check all that apply) :

Chemistry

1 answer:

harkovskaia [24]3 years ago

8 0

Answer:

(1 ) acid-base, double replacement

(2) double replacement

(3) combustion, combination

(4) double replacement, precipitation

Explanation:

(1) Recognize this as the reaction of the acid (HI) with the base (NaOH) to produce salt (NaCl) and water.

This reaction is also a double replacement since Na replaces H in HI,and H replaces Na in NaOH.

(2) Here we have a double replacement where Cu replaces Zn in ZnCrO4, and Zn replaces Cu in CuSO4

(3) Here we have the combustion of the organic compound CH3CH2OH (ethanol) with oxygen to produce CO2 and water.

This reaction is also a combination reaction reaction of oxygen with CH3CH2OH

(4) This reaction is also a double replacement where Ag replaces Na in NaCl and Na replaces Ag in AgNO3

The reaction is also a precipitation reaction where a precipitate AgCl is formed from the reaction of aqueous NaCl plus AgNO3 to produce solid AgCl and aqueous NaNO3.

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A 2.684-g sample of zinc oxide was reduced by hydrogen gas, resulting in 2. 156 g of pure zinc metal. Determine the empirical fo

Afina-wow [57]

The empirical formula of the initial zinc oxide is ZnO.

<h3>What is Empirical Formula?</h3>

The empirical formula of a compound represents the ratios of elements in a compound but not the actual numbers or arrangement of the atoms.

It is the lowest whole number ratio of the element in the compound.

<h3>How to find out the empirical formula?</h3>

Find out the given masses and molar masses of the elements

The molar mass of Zn = 65 gmol⁻¹

Given the mass of Zn = 2.156 g

The molar mass of Oxygen = 16 gmol⁻¹

The mass of Oxygen = Mass of a sample of zinc oxide - the mass of zinc metal

= (2.684 - 2.156) g

= 0.528 g

Find the number of moles of the elements in the compound

The number of moles is given by

$n = \frac{m}{M}$

where m = given mass and

M = Molar mass

Number of moles of Zinc = $\frac{2.156}{65}$ = 0.033 moles

Number of moles of Oxygen = $\frac{0.528}{16}$ = 0.033 moles

Find the simplest ratios of the elements in the compound. To find the ratios simply divide the number of moles by the lowest number of moles obtained.

Here, the number of moles is the same for both elements. Hence, the simplest ratio for Zn:O is 1:1.

Therefore, the empirical formula of zinc oxide is ZnO.

Learn more about the empirical formula:

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1 year ago

In the Lewis structure for a molecule, one of the nitrogen atoms shares six electrons with a carbon atom and has two electrons t

lutik1710 [3]

Answer: option D. triple bond and one lone pair

Explanation:

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3 years ago

How do producers and consumers get energy from the sun?

Marysya12 [62]

Answer: In photosynthesis, producers combine carbon dioxide, water, and sunlight to produce oxygen and sugar (their food). Other organisms get energy by eating producers. ... It cannot directly use the Sun's energy to make food. As a consumer, it has to eat— or, consume— other organisms for energy.

Explanation: Thats how both producers and consumers get energy

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3 years ago

Help help help.

Whitepunk [10]

I think B
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3 years ago

Anabolic reactions _______ bonds, whereas catabolic reactions __________ bonds. A. decrease; increase. B. break; make C. weaken;

nexus9112 [7]

Answer:

The corrext answer is E. make; break

Explanation:

In living organisms, the metabolism is either anabolic or catabolic where anabolic metabolism is energy consuming and catabolic metabolism is eneegy releasesing. It should however be noted that anabolic reaction builds or biosynthesize new mollecular structures while catabolic reaction breaks down complex structure bonds into simple structures

The braking down of bonds in catabolic reations realeses energy to sustain the anabolic rection process for the formation of new bonds

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