The percent by mass is the ratio of the mass of each element to the total mass of the compound expressed as a percentage. Attached is the formula. What is the percent by mass of Oxygen in 10 grams of H20 given the mass by analysis of oxygen in that sample is 8 grams. (Answer should be given with a %. i.e. if the answer were 23% you answer in the textbox would be 23%)

Percent by mass = mass of solute mass of solution x 100 ​
help me please:((

Answer:

Even though plants are rooted in the ground, they still move, exert force, and do work.

Plant cells have very strong cell walls that allow pressure to build up inside of the cell as water is absorbed. This pressure is called turgor.

When turgor pressure is high enough in a cell, the cell walls become firm and as a result, the cell becomes rigid and the plant is able to stand tall and straight.

When a plant does not get enough water, the turgor pressure inside of the cells decreases. A decrease in pressure pushing against the cell wall causes the cells to lose their shape and shrink. This causes the plant to begin to droop or wilt.

When the wilted plant gets enough water, the cells will become rigid again, and the plant will stand firm and straight once again.

Explanation:

Answer:

Forming positive ions

Explanation:

A sodium atom has one electron in its outer shell. ... It will still have 11 positive protons but only 10 negative electrons. So, the overall charge is +1. A positive sign is added to the symbol for sodium, Na +.

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Explanation:

Forming Positive Ions

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The Statement that best describing a machine is "any device that makes work more easier" Hence Option (A) is correct.

A machine is generated by the intellect of Humans to make work more efficient and easier.

It is an invention which multiplies the effect of efforts of Human being in any task.

The machine produces a mechanical efficiency as well.

Therefore, The Statement that best describing a machine is "any device that makes work more easier" Hence Option (A) is correct.

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Answer:

Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

Explanation:

Answer: 28 days.

Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!! :D

Answer:

Explanation:Typically, manufactured glass contains around 15% sodium oxide, 70% silica (silicon dioxide) and 9% lime (calcium oxide). The sodium carbonate "soda" serves as a flux to lower the temperature at which the silica mixture melts

Answer:

The atom with the smallest mass is the hydrogen atom; its mass is about 10-27 kg. The masses of other atoms go up to about 200 times this. The nucleus of an atom is about 10-15 m in size; this means it is about 10-5 (or 1/100,000) of the size of the whole atom.

Answer:

That's is true maybe I'm not sure check your book

Because i just did it

answer c

Answer:

Sorry hun i dont know but if u post a pic i might be able to help...Pls mark most brainliest by pressing the crown Hope u get an A have a nice day

Explanation:

Answer:

Mass is your answer

Explanation:

Answer:

The instructions in a gene that tell the cell how to make a specific protein. A, C, G, and T are the "letters" of the DNA code; they stand for the chemicals adenine (A), cytosine (C), guanine (G), and thymine (T), respectively, that make up the nucleotide bases of DNA.

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DNA contains the commands that an organism requires to develop, survive, and reproduce. DNA sequences must be transformed into messages that can be used to make proteins, which are the complex molecules that do the majority of the work in our bodies, in order to perform these functions.

Deoxyribonucleic acid is a polymer consisting of two polynucleotide chains that coil into one another to form a double helix.

It contains genetic information in the form, fully operational, growth, and reproduction of all kinds of organisms and viruses. Nucleic acids include DNA and ribonucleic acid.

DNA stores information as a code composed of four chemical bases: adenine (A), guanine (G), cytosine (C), and thymine (T).

DNA contains all of the instructions that an organism needs to develop, survive, and reproduce.

To perform these functions, DNA sequences must be transformed into messages that can be used to make proteins, which are the complex molecules that do the majority of the work in our bodies.

Thus, these are some of the instructions that DNA provides to cell.

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Answer:

1.- Chemical change

2.- Because the atoms in the image are tranformed into a new molecule

3.- Yes, it does

4.- Due to the amount of atoms are the same both in products and reagents

Explanation:

Answer:

1.- Chemical change

2.- Yes it does ,because the atoms in the image are transformed into a new molecule

3.- Yes, it does because energy is not being created or destroyed

4.- Due to the amount of atoms are the same both in products and reagents

Formula of hydrated sodium carbonate : Na₂CO₃.10H₂O, so moles of water in one mole of hydrated salt = 10

Hydrate is a compound that binds water (H₂O), usually in the form of crystals/ solids

If these compounds are dissolved in water or heated, the hydrates can decompose:

Example: X.YH₂O (s) → X (aq) + YH₂O (l)

The formula for the hydrated compound contains: YH2O

The mole ratio shows the ratio of the coefficients of the hydrate compound

10.45 hydrated sodium carbonate(Na₂CO₃.xH₂O) were heated until 3.87 of 3.87of anhydrous (Na₂CO₃) remained, so

mass H₂O released :

[tex]\tt 10.45-3.87=6.58~g[/tex]

mass Na₂CO₃ = 3.87 g

mol ratio Na₂CO₃(MW= g/mol) : H₂O(MW=18 g/mol) =

[tex]\tt \dfrac{3.87}{105,9888}\div \dfrac{6.58}{18}=0.0365\div 0.3655=1\div 10[/tex]

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{9.47 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.730897...[/tex]

We have the final answer as

Hope this helps you

Answer:

15.7 moles of Ar

Explanation:

Given data:

Number of atoms = 9.47 ×10²⁴ atoms

Number of moles of Ar = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

9.47 ×10²⁴ atoms × 1 mole / 6.022 × 10²³ atoms

1.57×10¹ mol

15.7 mol

Answer:

True

Explanation:

Answer:

false

Explanation:A high energy light will have a shorter wavelength than a low energy light. If the wavelength goes down, then the frequency goes up. When calculating energy in the equation, E=hv, frequency

Answer:

Just look at which one it doesn't show.

Explanation:

Characteristics of compounds

1. Components in a compound are present in a definite proportion.

2. It has a homogeneous composition.

3. Particles in a compound are of one kind.

4. A compound is made up of one or more atoms of the same or different elements.

5. In a compound the elements are present in a fixed ratio by mass.

6. A compound can be divided into simpler substances by a chemical process.

7. The physical and chemical properties of a compound are completely different from those of its constituents.

Answer:

Mass & Volume

Explanation:

An Extensive Property is a property that depends on the amount of matter in a sample. Mass and volume are examples of extensive properties. Meanwhile, Color, Temperature, and Solubility are examples of Intensive Properties.

Answer:

0.91m/s due west

Explanation:

Given parameters:

Time taken  = 17.2s

Displacement  = 15.6m

Unknown:

Velocity of the cart  = ?

Solution:

Velocity of a body is the the displacement divided by the time taken.

 Velocity  = [tex]\frac{displacement}{time}[/tex]  

Now insert the parameters and solve;

 Velocity  = [tex]\frac{15.6}{17.2}[/tex]  = 0.91m/s due west

Answer:

800 kJ

Explanation:

Answer:

800 kj

Explanation:

the line is at 800

Answer:

D. Genes received from the offsprings parents.

Explanation:

Answer:

8/ 13

Explanation:

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