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3 years ago

2 Mg(s) + O2(g) → 2 MgO(s) ΔH = -1204 kJ

1 answer:

5 0

Answer is C because since you are forming bonds, energy is released (exothermic). Since it is exothermic, the products will have lower energy than the reactants.

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Describe what happens to the electrons when sodium and chlorine combine to make NaCl.

kiruha [24]

When a sodium atom transfers an electron to a chlorine atom, forming a sodium cation (Na+) and a chloride anion (Cl-), both ions have complete valence shells, and are energetically more stable. The reaction is extremely exothermic, producing a bright yellow light and a great deal of heat energy.

4 0

2 years ago

Which description best characterizes the motion of particles in a solid?

Masja [62]

Answer:

D. Vibrating around fixed positions

Explanation:

It's right on edge

6 0

2 years ago

4 moles of hydrogen react with 5 moles of oxygen to form water, identify the excess reagent?

Fynjy0 [20]

Answer:

Excess Reagent = oxygen

Explanation:

Limiting reagent: The substance that is totally consumed when the reaction is completed.

Excess reagent: The substance left after the limiting reagent is consumed completely

The balanced chemical equation for formation of water is as follow:

$2H_{2}+O_{2}\rightarrow 2H_{2}O$

This means when 2 moles of hydrogen reacts with 1 mole of oxygen, 2 moles of water is produced.

Hence the ratio in which hydrogen and oxygen gas reacts is 2:1

Now if 2 mole hydrogen require 1 mole of oxygen ,then 4 mole hydrogen need 2 mole of oxygen.

$H_{2}:O_{2}=2:1$

$H_{2}:O_{2}=4:2$

Here 5 mole of oxygen is reacting but only 2 mole is required .

Oxygen is in excess.

5 0

3 years ago

A certain FM radio wave has a frequency of 1.31 x 108 Hz. Given that radio waves travel at

Westkost [7]

Answer:

2.28 m

Explanation:

Use the relationship

λ=vf

to solve for wavelength λ. Substituting the known quantities yields:

λ=vf

λ=2.99 x 108 m/s1.31 x 108 Hz

λ=2.28 m

4 0

3 years ago

Which chemical change ? A.boiling B.freezing C.burning D.melting

fredd [130]

ANSWER:

the answer is burning as it is a chemical change emaning that the substance changes chemically, the other choices are exp of physical changing meaning they stay the same substance but change physically

~batmans wife dun dun dun...aka ~serenitybella

5 0

3 years ago

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