CHEMISTRY HIGH SCHOOL

What is the chemical formula for iron(III) oxide?
(1) FeO (3) Fe3O
(2) Fe2O3 (4) Fe3O=

Answers

Answer 1
Answer: The chemical formula for Iron (III) oxide is Fe203.

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Mercury has a specific gravity of 13.6. how many milliliters of mercury have a mass of 0.35 kg

Answers

The formula for specific gravity is:

Specific gravity = (\rho _(substance))/(\rho _(water))

where \rho _(substance) is the density of the substance and \rho _(water) is the density of water.

The density of water, \rho _(water) = 1 g/mL

Substituting the values in above formula we get,

13.6 = (\rho _(substance))/(1)

\rho _(substance) = 13.6 g/mL

The formula of density is:

density = (mass)/(volume)

The density of mercury is 13.6 g/mL

The mass of mercury is 0.35 kg = 0.35 kg * 1000 (g)/(kg) = 350 g

Substituting the values in density formula:

13.6 g/mL = (350 g)/(volume)

volume = (350 g)/(13.6 g/mL) = 25.73 mL

The amount, in milliliters, of mercury that will have a mass of 0.35 kg would be 25.74 mL.

If the specific gravity of mercury is 13.6, the density can be obtained such that:

Density of mercury = specific gravity of mercury/density of water

The density of water is 1 g/mL. Thus:

Density of mercury = 13.6/1

                              = 13.6 g/mL

Also; density = mass/volume

       volume = mass/density

                    = 350/13.6

                       = 25.74 mL

Thus, the number of milliliters of mercury that will have a mass of 0.35 kg would be 25.74.

More on density can be found here: brainly.com/question/14940265?referrer=searchResults

Boyle's law deals what quantities?

Answers

Boyle's law deals with pressure and volume.

What is Boyle's law?

Robert Boyle studied the relationship between the pressure p and the volume V of a confined gas held at a constant temperature.

Boyle observed that the product of the pressure and volume are observed to be nearly constant.

The product of pressure and volume is exactly a constant for an ideal gas.

                                                    PV = constant

As per Boyle’s law, any change in the volume occupied by a gas (at constant quantity and temperature) will result in a change in the pressure exerted by it. In other words, the product of the initial pressure and the initial volume of a gas is equal to the product of its final pressure and final volume (at constant temperature and number of moles).

Therefore, Boyle's law deals with pressure and volume.

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Boyle's law states that P1V1= P2V2.
Pressure= P 
Volume= V

Pressure involves torr, atm, kPa,etc..
Volume involves mls/ milliter, l / liter, etc...

What is the percentage of nitrogen in N2O

Answers

The percentage of nitrogen in nitrous oxide or N₂O  is 63.64% and percent of oxygen is 36.36 %.

What is percent composition ?

It is the percent of each element which exists in a compound. It is calculated in three methods:

1) percent w/w

2) percent v/v

3) percent w/v

Percent w/w is the percent composition wherein both the components are solids.Percent v/v is percent composition wherein the 2 substances are liquid and percent w/v is percent composition where one substance is solid and one is in liquid form.

The percent composition of all substances is equal to 100%.The percent composition of nitrogen in nitrous oxide is calculated as follows:

molar mass of nitrous oxide=44 g

molar mass of nitrogen =14 g

As nitrous oxide has 2 nitrogen ,therefore 14×2=28

To find percent composition,

molar mass of nitrogen in nitrous oxide/molar mass of nitrous oxide×100

∴28/44×100=63.64%

Thus, percent of nitrogen in N₂O is 63.64%.

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Answer:

63.64% Nitrogen

36.36 Oxygen

Which of the following is an example of a molecule? (A) CO₂ (carbon dioxide). (B) H₂O (water). (C) O₂ (oxygen in atmosphere). (D) NaCI (sodium chloride:table salt). ?

Answers

my best guess is d ... 

In chemistry class, Allen determined the effectiveness of various metals in releasing hydrogen gas from hydrochloric acid. Several weeks later, Allen read that a utilities company was burying lead next to iron pipes to prevent rusting. Allen hypothesized that less rusting would occur with the more active metals. He placed the following into 4 separate beakers of water: (a) 1 iron nail, (b) 1 iron nail wrapped with an aluminum strip, (c) 1 iron nail wrapped with a magnesium strip, and (d) 1 iron nail wrapped with a lead strip. He used the same amount of water, equal amounts (mass) of the metals, and the same type of iron nails. At the end of 5 days, he rated the amount of rusting as small, moderate, or large. He also recorded the color of the water. What is the independent variable?a) the amount of water
b) the metals strips
c) amount of rust
d) hydrochloric acid

Answers

Answer:

b) the metals strips

Explanation:

In an experimental design, an independent variable is a variable that is changed or manipulated in a series of experiments. An independent variable is not dependent on any other variable in the experiment. The hypothesis for this experiment is stated to be: "If the chemical activity of the metallic wrapper is increased, then less rusting of iron will occur. The independent variable relates to the type of metal wrapping strip, and the dependent variables are the amount of rusting and color of the water.

An acid-base indicator is used in what type of reaction?

Answers

Acid - base indicators (also known as pH indicators) are substances which change color with pH. They are usually weak acids or bases. you use them if you want to know if a solution is an acid or it it's a base
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