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4 years ago

5

Which of these chemical equations describes a metal displacement reaction?

2 answers:

vekshin14 years ago

6 0

It would be helpful to include multiple choice next time but, here is your answer: <span>Fe2O3(s) + 2Al(s) --> 2Fe(s) + Al2O3(s) </span>
<span>the metal aluminum displaces the metal Iron</span> Metal Aluminum" displaces the metal Iron. I might have done this test before and if this is multiple it might be, B. :)

mixas84 [53]4 years ago

3 0

Answer:

Fe₂O₃(s) + 2 AI(s) → 2 Fe(s) + Al₂O₃(s)

Explanation:

The options are missing but I looked on the web and I think these are the ones.

<em>Which of these chemical equations describes a metal displacement reaction? </em>

<em>2 NaN₃(s) → 2 Na(s) + 3 N₂(g)</em>

NO. This is a decomposition reaction.

<em>Fe₂O₃(s) + 2 AI(s) → 2 Fe(s) + Al₂O₃(s) </em>

YES. This is a metal displacement reaction. Fe is displaced from Fe₂O₃.

<em>3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)</em>

NO. This is redox reaction.

<em>2 P(s) + 3 Cl₂(g) → 2 PCl₃(g)</em>

NO. This is a synthesis reaction.

<em>2 ZnS(s) + 3 O₂(g) → 2 ZnO(s) + 2 SO₂(g)</em>

NO. This is a redox reaction.

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Which of the following correctly illustrates the conservation of mass for the reaction below?

ANEK [815]

In order to apply the principle of conservation of mass to this reaction, we must prove that the mass on the left hand side is equivalent to the mass on the right hand side. In order to do this, we must first acquire the atomic masses of each substance involved. These are:
Fe - 56
O - 16

Now, we substitute these values into the equation:
4(56) + 3(2*16) = 2(56 * 2 + 16 * 3)
224 + 96 = 320
320 = 320

As we can see, the principle of conservation of mass holds true.

8 0

4 years ago

What is the density of a solid that has a mass of 100g and a volume of 25mL.?

Arte-miy333 [17]

Answer:

D = 4 g/mL

General Formulas and Concepts:

Density = Mass over Volume

D = m/V

Explanation:

<u>Step 1: Define</u>

m = 100 g

V = 25 mL

D = unknown

<u>Step 2: Find D</u>

Substitute: D = 100 g/25 mL
Evaluate: D = 4 g/mL

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3 years ago

For the wild type (unmutated) enzyme, you measure a rate of p-nitrophenol release by the change in absorbance at 405 nm (for the

Aleks04 [339]

Answer:

1.2x10⁻⁵M = Concentration of the product released

Explanation:

Lambert-Beer's law states the absorbance of a solution is directly proportional to its concentration. The equation is:

A = E*b*C

<em>Where A is the absotbance of the solution: 0.216</em>

<em>E is the extinction coefficient = 18000M⁻¹cm⁻¹</em>

<em>b is patelength = 1cm</em>

<em>C is concentration of the solution</em>

<em />

Replacing:

0.216 = 18000M⁻¹cm⁻¹*1cm*C

<h3>1.2x10⁻⁵M = Concentration of the product released</h3>

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3 years ago

Where do producers get their energy?

Ahat [919]

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4 years ago

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netineya [11]

Answer:

The α‑helix is held together by hydrogen bonds between the amide N−H and C=O groups.

Disulfide bonds stabilize secondary structure.

Explanation:

Proteins have primary, secondary, tertiary and quartinary structures.

The secondary structure of a protein is the regular, recurring sequence of amino acid in a polypeptide chain. Secondary structure of proteins give rise to the folding observed in the structure of a protein.

The major secondary structures of a protein are α-helices and β-structures.

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3 years ago