How many moles are there in 3.9 grams of potassium

Answer:

c. F

Explanation:

As you go top to bottom down a column of the periodic table, atomic radius increases.

As you go left to right across a period of the periodic table, atomic radius decreases.

Knowing this trend, that means that the smallest atomic radius would be located in the top right of the periodic table. The closest element to that point is fluorine, or answer C.

Answer:

A.

Explanation:

Answer:

CH4

Explanation:

Answer:

Because different isotopes have different numbers of neutrons, they do not all weigh the same or have the same mass. Different isotopes of the same element have the same atomic number. They have the same number of protons. The atomic number is decided by the number of protons.

Hope this helps!!!!

Explanation:

Answer:

Well I would say " I think my responsibility is recycling, gardening, picking up litter, and using less pollution. All of this stuff is very important. Sometimes, it's the tiny things that change the world for the better."  

I hope this helped! Feel free to add your own little tweaks.

Answer:

Aluminum is more reactive than carbon so it must be extracted from its compounds using electrolysis.

Explanation:

Even though aluminum is more abundant than iron in the Earth's crust, aluminum is more expensive than iron. This is mainly because of the large amounts of electrical energy used in the extraction process.

Specific gravity is the "heaviness" of a mineral. It is defined as a number that expresses the ratio between the weight of a mineral and the weight of an equal volume of water.

Answer:

The ratio of it's mass of an equal volume of water.

Explanation:

these are the correct answers

Answer:

V= 21 cubic cm (( I am not sure about density ))

Explanation:

V= L×W×H

Answer:

117 millimeters = 0.117 meters

Explanation:

This is using unit conversions. There are 1000 millimeters in 1 meter, so you would divide your starting value, 117 millimeters by 1000 millimeters. The units will cancel because they are being divided by themselves and you are left with 0.117 meters.

Answer:

ok so you would just weigh 125 because 16 oz is 1 pound

Explanation:

Answer:

The answer is below

Explanation:

Sulfuric acid is used for various purposes, some of which include the following:

1. It is used in the production of various manufactured goods.

2. It is used in the manufacturing of chemicals

3. It is also used in the making of fertilizer

4. It is used in the refining process of petroleum products

5. It is used in the processing of metals

Answer:

lost is the answer to this question but if I am wrong I am so sorry for that

Answer:

Multicellular

they are single celled

Answer:   I think it’s D?

Explanation:

Answer:

D.

Explanation:

Weathering, erosion and deposition are processes that can wear a mountain down.

Answer:

Ver explicacion

Explanation:

Una desventaja del uso de la industria de la energía nuclear es la posible exposición de los trabajadores a una dosis letal de radiación.

Este tipo de exposición es muy perjudicial para las personas.

En segundo lugar, el hecho de que la fuente de energía nuclear esté siempre encendida significa que debe ser atendida regularmente por personal competente.

Answer:

Difficult Question but I would say no

Explanation:

I say no because the whole premise of a chemical reaction is the reaction to new bonds and bond losses happening due to the introduction of a new substance. If the substance hasn't changed at all, it wouldn't be a chemical reaction because their would be nothing reacting.

Answer:

1. Force

2. contact force

3. non-contact force

4. magnetism

5. strength and direction

6. length, direction

7. newtons

Explanation:

You're welcome <3

Answer:

Explanation:

Using Charles Law ,

[tex]\frac{V1}{T1}=\frac{V2}{T2}[/tex]

Using this formula we have ,

V1= 200cm^3

T1=40+273.15 = 313.15 K

T2 = 100+273.15 = 373.15 k

V2= ?

Hence using above formula simplify it we will get ,

V2 = 238.3 cm^3

Answer:

i dont know that plzzz help me tooooo

Answer:

If you were to plug your nose, it would block out more than 80% of taste, causing all three items to have no taste- therefore making them taste the same.

Explanation:

Answer:

Magnesium Difluoride

Explanation:

Mg = magnesium

F = fluoride

F2 = difluoride (prefix "di" indicates 2)

Answer:

I will give up the electrons

Explanation:

Consider the following rules:

1. An atom loses electrons if its oxidation number is positive.

2. An atom gains electrons if its oxidation number is negative.

3. An atom neither gains nor loses electrons if its atomic number is zero.

As I have an oxidation number [tex]+2[/tex] that is oxidation number is positive, so, I will give up electrons.

Answer:

The net force is 5 N and to the left.

Explanation:

37 N - 32 N = 5 N and since there is a stronger pull from the rope moves towards the left so the direction of motion is left.

Answer: true

Explanation:

Answer:

Try going onto essaytyper.com

Number of moles =0.52 moles

The number of moles is defined as the ratio between given mass and molar mass.

Given:

Mass of PbSO₄ = 158.1 grams

To find:

Number of moles=?

Molar mass of PbSO₄ =  303.26 g/mol

[tex]\text{Number of moles}= \frac{\text{Given mass}}{\text{Molar mass}}\\\\\text{Number of moles}= \frac{158.1}{303.26}\\\\ \text{Number of moles}= 0.52\text{ moles}[/tex]

Thus, the number of moles it contain will be 0.52.

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