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3 years ago

Which of the following elements is more reactive than the others? Nitrogen (N) Oxygen (O) Selenium (Se) Sulfur (S)

Chemistry

2 answers:

denpristay [2]3 years ago

5 0

C. It is in the row below and therefore more reactive

ale4655 [162]3 years ago

5 0

Answer: Option (b) is the correct answer.

Explanation:

More is the electronegativity of an atom or element more will be its reactivity.

When we move across a period from left to right in a Periodic table then there will increase in electronegativity. And, when we move down a group then there will be decrease in electronegativity.

Oxygen, sulfur and selenium are all group 16 elements. So, their electronegativity decreases down the group. Also, nitrogen is less electronegative than oxygen atom.

Hence, we can conclude that out of the given options element oxygen is more reactive than the others.

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What is needed to burn the candle (reactant)?

Alexus [3.1K]

Answer:

wax, candlewick, and oxygen

Explanation:

The burning of the candle is both a physical as well as a chemical change. The reactants are the substances or the raw materials that are required for a reaction to the process. In the process of burning a candle, the reactants are the fuel which includes wax and wick, and oxygen which is found in the air. The products found at the end of the reaction are carbon dioxide and water vapor.

8 0

3 years ago

A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration o

HACTEHA [7]

Answer:

1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Explanation:

From the question given above, the following were obtained:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Volume of solution = 20.4 mL

Concentration of solution =?

Next, we shall determine the mass of sodium hydroxide, NaOH. This can be obtained as as illustrated below:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Mass of NaOH =?

Mass of NaOH = (Mass Cylinder + NaOH) – (Mass of empty cylinder)

Mass of NaOH = 31.92 – 9.5

Mass of NaOH = 22.42 g

Finally, we shall determine concentration of the solution as follow:

Mass of NaOH = 22.42 g

Volume of solution = 20.4 mL

Concentration of solution =?

Concentration = mass /volume

Concentration of solution = 22.42 / 20.4

Concentration of solution = 1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Therefore, the concentration of the solution is 1.1 gmL¯¹

3 0

3 years ago

????.? .?.? . I have some question on Alef website

Andrew [12]

B. crust, middle, core

8 0

3 years ago

Read 2 more answers

What indicators of a chemical reaction occurred in the following equation?

ch4aika [34]

Answer:

1) evolution of gas

2) evolution of heat

Explanation:

In this reaction, glucose is broken down into its constituents; carbon dioxide and water. The question is to decipher indicators of a chemical reaction from the equation.

If we look at the equation carefully, we will notice that a gas was evolved (CO2). The evolution of a gas indicates that a chemical reaction must have taken place. Secondly, energy is given off as heat. This is another indication that a chemical reaction has taken place.

6 0

2 years ago

Which of the following is NOT an example of a Heterogeneous Mixture?

yuradex [85]

Answer:

pretty sure its table salt

5 0

2 years ago

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