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3 years ago

Which of the following molecules are ionic?

Chemistry

2 answers:

kkurt [141]3 years ago

6 0

1st one is E
2nd one is also E

Vaselesa [24]3 years ago

4 0

Answer:

For A: The correct answer is Option E.

For B: The correct answer is Option E.

Explanation:

For A:

Ionic compound is defined as the compound which is formed by complete transfer of electrons from one atom to another atom.

This bond is usually formed between a metal and a non-metal or a metal reacts with a polyatomic ion or a reaction between two polyatomic ions takes place.

For the given options:

Option A: $RbNO_3$

This compound is formed by the combination of $Rb^+\text{ and }NO_3^-$ ions. Rubidium is a metal and nitrate is a polyatomic ion

Hence, it is an ionic compound.

Option B: $Na_2SO_4$

This compound is formed by the combination of $Na^+\text{ and }SO_4^{2-}$ ions. Sodium is a metal and sulfate is a polyatomic ion

Hence, it is an ionic compound.

Option C: $MgCl_2$

This compound is formed by the combination of $Mg^{2+}\text{ and }Cl^-$ ions. Magnesium is a metal and chlorine is a non-metal

Hence, it is an ionic compound.

Option D: $NaI$

This compound is formed by the combination of $Na^+\text{ and }I^-$ ions. Sodium is a metal and iodine is a non-metal

Hence, it is an ionic compound.

Thus, the correct answer is Option E.

For B:

Covalent compound is defined as the compound which is formed when sharing of electrons takes place between the atoms. This is usually formed between two non-metals.

Option A: $SO_2$

This compound is formed by the combination of sulfur and oxygen atoms. Both are non-metals.

Hence, it is a covalent compound.

Option B: $C_2H_2O$

This compound is formed by the combination of carbon, hydrogen and oxygen atoms. All are non-metals.

Hence, it is a covalent compound.

Option C: $NO_2$

This compound is formed by the combination of nitrogen and oxygen atoms. Both are non-metals.

Hence, it is a covalent compound.

Option D: $SiO_2$

This compound is formed by the combination of silicon and oxygen atoms. Both are non-metals.

Hence, it is a covalent compound.

Thus, the correct answer is Option E.

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Reaction Rates

inn [45]

Answer:

PART A 1st order in A and 0th order in B

Part B The reaction rate increases

Explanation:

PART A

The rate law of the arbitrary chemical reaction is given by

$-r_A=k\times\left[A\right]^\alpha\times\left[B\right]^\beta\bigm$

Replacing for the data

Expression 1 $0.00639=k\times{0.12}^\alpha\times{0.22}^\beta$

Expression 2 $0.01280=k\times{0.24}^\alpha\times{0.22}^\beta$

Expression 3 $0.00639=k\times{0.12}^\alpha\times{0.11}^\beta$

Making the quotient between the fist two expressions

$\frac{0.00639}{0.01280}=\left(\frac{0.12}{0.24}\right)^\alpha$

Then the expression for $\alpha$

$\alpha=\frac{ln\frac{0.00639}{0.01280}}{ln\frac{0.12}{0.24}}=1\bigm$

Doing the same between the expressions 1 and 3

$\frac{0.00639}{0.00639}=\left(\frac{0.22}{0.11}\right)^\beta$

Then

$\beta=\frac{ln\frac{0.00639}{0.00639}}{ln\frac{0.22}{0.11}}=0\bigm$

This means that the reaction is 1st order respect to A and 0th order respect to B .

PART B

By the molecular kinetics theory, if an increment in the temperature occurs, the molecules will have greater kinetic energy and, consequently, will move faster. Thus, the possibility of colliding with another molecule increases. These collisions are necessary for the reaction. Therefore, an increase in temperature necessarily produces an increase in the reaction rate.

4 0

3 years ago

List any two examples of man-made de astery

PIT_PIT [208]

Answer:

Man-made disasters can include hazardous material spills, fires, groundwater contamination, transportation accidents, structure failures, mining accidents, explosions and acts of terrorism. There are actions that we can take to prepare to react appropriately to these events.

Explanation:

hope it will help

6 0

3 years ago

The heaviest commonly used United States coin is the half dollar, which has a mass of 11.340g. The lightest United States coin i

Kruka [31]

Answer:

13.6×10^3

Explanation:

11.340+2.268= 13.608

7 0

4 years ago

Which of the following are examples of a physical property of matter? Select all that apply.

NemiM [27]

Answer:

what are the options i cant see em

Explanation:

6 0

3 years ago

I need help with that

Juliette [100K]

Answer:

For (a) the independent variable is what stays constant throughout the whole experiment and the dependent variable is changes in the experiment.

Explanation:

I'm not sure about the other parts, but I hope my explanation for a can get you started :)

5 0

3 years ago