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3 years ago

A substance whose molecule is monatomic

1 answer:

8 0

All of the elements in the periodic table are monoatomic except the 7 elements that are diatomic atoms. These 7 elements are hydrogen, nitrogen, oxygen, chlorine, bromine, iodine and fluorine. Monoatomic substances are those elements that are stable by themselves.

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According to the work principle, the ration of work output to work input is always _____.

vekshin1

Answer:

less than one.

Explanation:

5 0

2 years ago

Convert 5.0 x 1027 r.p. of copper to moles of copper.

PtichkaEL [24]

Convert 5.0 to 1027 an you should get your answer

3 0

2 years ago

I'm very confused on Solubility and Temperature. Please Help!

lukranit [14]

When a solid is added to a liquid, there exists a possibility that it will get dissolved in the solid. However, this depends on a lot of factors, like the temperature of the substances, the volume of the liquid, and the amount and nature of the solid to be dissolved.

8 0

2 years ago

Please help me please

Roman55 [17]

Answer:

Explanation:

Molarity = moles / volume (L)

moles = mass (g) / Molecular weight (g/mol)

so you have mass in gram and volume in ml ( Volume must be in litter because unit of mass is gram )

g = L , mg = ml

first you must calculate the number of moles for each molecule and convert the ml to L and use the molarity law to calculate molarity for each molecule .

Ex71.

a. Mw for NaCl = 23+35 = 58 g/mole

no of moles = 1.5 / 58 = 0.025

ml to L = 100/1000 = 0.1 L

Molarity = 0.025 / 0.1 = 0.25 M

b. Mw for K2CrO4 = 39x2 + 52 + 16x4 = 194 g/mol

no of moles = 1.5 / 194 = 0.0077

ml to L = 100 / 1000 = 0.1 L

Molarity = 0.0077 / 0.1 = 0.077 M

----------------------------------------------

Ex 72

a. Mw for MgBr = 24 + 80 = 104 g/mol

no of moles = 20 / 104 = 0.19

ml to L = 250 / 1000 = 0.25 L

Molarity = 0.19 / 0.25 = 0.76 M

b. Mw for LiCO = 7 + 12 + 16 = 35 g/mol

no of moles = 5.55 / 35 = 0.158 moles

ml to L = 75 / 1000 = 0.075 L

Molarity = 0.158 / 0.075 = 2.106 M

Good Luck

3 0

2 years ago

What is the source of potential energy for the circuit shown in the picture above?

Likurg_2 [28]

The correct answer to this question is letter "B. the battery
."
Attached to this answer is an image that shows the connection of the battery to the switch to the bulb.

There exists the same question from other source with the following choices:
<span>A. the wires
B. the battery
C. the switch
D. the light bulb</span>

6 0

2 years ago

Read 2 more answers