PLEASE HELP WHAT IS THE RIGHT ANSWER

Explanation:

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Answer:

X5Y2

Explanation:

% composition of X = 52.2%

% composition of Y = (100 - 52.2) = 47.8%

This means that there are 52.2g of X and 47.8g of Y in the compound

To calculate the empirical formula of the compound, we first convert the gram value to mole value by dividing by their molar masses.

X = 52.2g/42.3g/mol = 1.234mol

Y = 47.8g/96.7g/mol = 0.494mol

Next, we divide each mole value by the smallest value (0.494mol)

X = 1.234mol ÷ 0.494mol = 2.49

Y = 0.494mol ÷ 0.494mol = 1

We multiply each value by 2

X = 2.49 × 2 = 4.98

Y = 1 × 2 = 2

The simple ratio of X:Y is 5:2, hence, their empirical formula is X5Y2.

Answer:

hydrogen is a non-metal and it has 1 valence electron

Explanation:

You can find the valence electrons on the bottom left of your periodic table, it is under the atomic number. Hydrogen is a non-metal because hydrogen conducts heat and electricity poorly.

Answer:

electrons

galvanic

half-

electrode

Explanation:

I got it right :)

The words that complete each of the blanks in the question are;

A voltaic cell is one that produces energy by a sponteanous chemical reaction. A voltaic cell is a type of electrochemical cell.

The following are the words that complete the individual blanks';

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Answer:

Measuring distances to stars through stellar parallax. Measuring distances to stars through the moving cluster method. Astronomers measure the temperature of a star by looking at the star's color and its spectrum. The apparent brightness of a star tells how bright it seems to us

Explanation:

Answer:

Analyze the Characteristics of a Star

Explanation:

Surface Temperature

First, you want to determine the color of the star - this can determine the heat and age of the star.

Second, you want to measure the spectrum and get the spectral type.

Chemical Composition

Determine which lines are present in the spectrum.

Luminosity

Measure the apparent brightness and compensate for distance

Radical Velocity

Measure the Doppler shift in the spectrum.

Rotation

Measure the width of spectral lines.

Mass

Measure the period and radial velocity curves of spectroscopic binary stars.

Diameter

1. Measure the way a star’s light is blocked by the Moon.

2. Measure the light curves and Doppler shifts for eclipsing binary stars.

Answer:

Reduced air pressure also has a serious effect on the human body. Reduced air pressure means that there is less oxygen available to the body. For lungs to inflate, the air pressure in your lungs has to be less than the air outside the lungs. This is because air moves from high-pressure areas to low-pressure areas.

Explanation:

Reduced air pressure also has a serious effect on the human body. Reduced air pressure means that there is less oxygen available to the body. For lungs to inflate, the air pressure in your lungs has to be less than the air outside the lungs. This is because air moves from high-pressure areas to low-pressure areas.

Answer:

it pops?

Explanation:

Zinc sulphate

Zinc sulphateZnSO₄

This is the answer.

Answer:

DNA

Explanation:

Genetic material DNA is passed from cell to cell.

DNA is Deoxyribonucleic acid. It is a polymer composed of two polynucleotide chains. These chains coil around each other to form a double helix. The polymer carries genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. It keeps on transferring from generation to generation. Two types of Nucleic acids are DNA and ribonucleic acid.

In DNA, 4 bases are present that are Adenine, Guanine, Cytosine and Thymine. Whereas Thymine is replaced by Uracil in case of RNA.

These bases are connected by hydrogen bonds with each other.

The configuration of the DNA molecule is highly stable, allowing it to act as a template for the replication of new DNA molecules, as well as for the production (transcription) of the related RNA (ribonucleic acid) molecule.

Therefore, Genetic material DNA is passed from cell to cell.

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Answer:

c

Explanation:

h

Answer:

neutrons is metal.......

Answer:

0.852 mol

Explanation:

First we convert 4.00 g of helium (He) into moles, using its molar mass:

4.00 g ÷ 2 g/mol = 2 mol He

To answer this problem we can use Avogadro's law, which states that at constant pressure and temperature:

V₁n₂=V₂n₁

Where:

We input the data:

And solve for n₂:

Answer:

Doubled.

Explanation:

The relationship between the temperature and the volume of a gas at a constant pressure can be described using Charles' law:

That means that the temperature and the volume of a gas are directly proportional: The higher the temperature, the higher the pressure. If one of those factors is increased twofold, the other one will be increased twofold as well.

Answer:Elastic energy is energy stored in an object for temporary strain. It is basically potential energy.

Answer:

True

Explanation:

Hydrogen is one of the most abundant elements in the universe so yes

Answer:

true

Explanation:

Hydrogen is an chemical element

Answer:

it can result in an increasing risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)

Magnesium can result in an increased risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)

Ammonium nitrate is used commonly in fertilizers; in pyrotechniques, herbicides, and insecticides; and in the manufacture of nitrous oxide.

When ammonium nitrate is heated, it decomposes exothermically into nitrous oxide and water.

Hence, Magnesium can result in an increased risk of the accumulation of decomposition products, self-heating (from the heat released by the slow decomposition reactions)

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Based on the rate of disappearance of HI, the rate of appearance of I₂ is 0.225 mol/L/s.

The rate of a reaction is the rate at which reactant molecules are converted to product or the rate at which product molecules are formed.

From the equation of the reaction, 2 moles of HI produces 1 mole of I₂.

The rate of disappearance of HI is -0.45 mol/L/s

The rate of appearance of I₂ will be 0.45/2 mol/L/s = 0.225 mol/L/s.

Therefore, the rate of appearance of I₂ is 0.225 mol/L/s.

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Answer:

2 C3H6 + 9 O2  6 H2O + 6 CO2

Theo. yield is 440.0 g CO2, % yield = 45.45% Explanation: hope it helps here for ur service

439.16 g of carbon dioxide is produced by complete combustion of 140 g of propene. The percent yield is 45.54%.

Combustion is defined as a high temperature exothermic reaction between a fuel which acts as a reductant and an oxidant which is usually atmospheric oxygen.It does not result in fire as the flame is visible only when substance which undergoes combustion vaporizes.

For combustion reactions to take place stoichiometry is followed according to which mass of reactants or products obtained or required is calculated.

2 C₃H₆ + 9 O₂  [tex]\rightarrow[/tex] 6 CO₂ + 6 H₂O

Here 2 molecules of propene react to give 6 molecules of carbon dioxide.

∴ for 140 grams of propene 140×264/84.16=439.16 g of molecules of CO₂ are produced.

Percent yield is calculated by dividing observed yield by theoretical yield which gives 45.54% according to this example.

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the outermost "layer..............

Answer:

Thin

Explanation:

Dry, hard rock from deep within the earth reacts with water and oxygen on the surface and creates new kinds of minerals

Answer:

True

Explanation:

Water vapor is totally invisible.

Without it, there would be no clouds or rain or snow, since all of these require water vapor in order to form. All of the water vapor that evaporates from the surface of the Earth eventually returns as precipitation - rain or snow.

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Answer:

I think that the statement is relative to speed because it is saying km per second.

Answer:

Speed

Explanation:

Answer:

12,312 J or 0.12312 kJ

Explanation:

q = mCT

q = J of heat  

m = mass

C = heat capacity

T = temp change

q = 38 x 0.90 x 3.6

q = 12312 J

q = 0.12312 kJ

Answer:

The number of outer shell electrons determines the group number of the element. The number of occupied principle quantum shells (energy levels) determines the period of the element. The proton number determines the element itself and its position.

Explanation:

Answer:

Certain breeds of fish will often clean bigger fish. The cleaner fish gets food, the bigger fish gets a cleaning.

I'm not too sure.

Good luck! <3

Answer:

C.

Explanation:

Heat transfer by thermal radiation is transfer of heat by electromagnetic wav

The meaning for heat to be transferred by radiation is energy is transferred when molecules absorb electromagnetic waves.

Electromagnetic waves are the waves of electromagnetic field. Examples are radio waves, x-rays, and gamma rays.

These waves carry through space with carrying electromagnetic radiations.

Thus, the correct option is C. Energy is transferred when molecules absorb electromagnetic waves.

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