C.5A What atom is shown below? *
8 points
19 p
20 n
Cholrine
Argon
Calcium
Potassium

Answer:

protons: 6

neutrons: 8

electrons:6

The percent yield is 74.4 %.

Fe₃O₄ + 4H₂ → 3Fe + 4H₂O

First, calculate the theoretical yield of H₂O.

Theor. yield =

0.112 g H

2

×

1 mol H

2

2.016 g H

2

×

4 mol H

2

O

4 mol H

2

×

18.02 g H

2

O

1 mol H

2

O

=

1.001 g H

2

O

Now calculate the percent yield.

% yield =

actual yield

theoretical yield

×

100

%

=

0.745 g

1.001 g

×

100

%

=

74.4

%

The mass in grams (theoretical yield) of hydrogen is produced is considered to be 0.119 g H2.

Since

Mass of Mg = 31.3 g

Mass of H2O = 2.12 g

First, we have to determine the mole

So,

Mole of Mg = mass of Mg / molar mass of Mg

= (31.3 g ) / (24.30 g/mol )

= 1.28 mole

And,

Mole of H2O = (2.12g ) / (18.01g /mol )

= 0.117 mole

As per the chemical reaction:

2 mole of H2O react with 1 mole of Mg

So, 0.117 mole of H2O will react with mole of Mg is

Now

= ( 1 mol Mg / 2 mol H2O ) * 0.117 mol H2O

= 0.058 mole of Mg

Now

1 mole of Mg produce , 1 mole of H2

So,

0.058 mole of Mg will produce 0.058 mole of H2

Now, determine the mass of H2

= Molar mass of H2 * mole of H2

= 2 * 0.058

= 0.116 g

= 0.119

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Answer:

D.) powerful microscopes ....... telescopes are for space our eyes can't see atoms and hand lenses are not gonna do you any good

Answer: it is a solid at room temperature.

Explanation:

The ions of the two reactants are Na{+} and Br{-}, so the formula of the product is NaBr.  

and when the NaCl is a solid a room temperature. and when NaBr has similar properties to NaCl, so NaBr is a solid at room temperature too.

so our chemical formula for the product is NaBr and It's a solid at room temperature.

Answer:

4,9725*10⁻¹³[J].

Explanation:

all the details are in the attached picture, answer is marked with orange colour.

Answer:

D

the genes of the egg determine

Answer:

81.72 +0.73=82.45

Explanation:

1

81.72

+0.73

= 82.45

82.72 + 0.73 = 82.45

Explanation:

0.72+0.73 = 1.45

Therefore 81+1.45= 82.45 ( Integer in addition with a decimal number).

Answer:

Explanation:

· 3.5 x 10^15 atoms of sodium to moles of sodium. Answers: 1 Show answers : ) Another question on Chemistry. Chemistry, 21.06.2019 22:30. Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u. Answers: 1. Answer. Chemistry,

Answer:

gdfktfnfgh trhdfih tdjgd

Answer:

Abe chutiye, Question sahi se likh laude phle

Answer: a

Explanation:

Many bubbles formed after mixing.

The statement which best provides support for the fact that a chemical change has occurred is that many bubbles formed after mixing.

In a chemical change, new substances are formed and there is a recombination of the atoms in reactants as the products are being formed.

There are several cues that indicate that a chemical change has taken place such as;

In the particular instance in this question, when baking soda and vinegar were mixed together, a gas was evolved signifying that a chemical change has taken place.

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Answer:

2Fe2O3 + 3C → 4Fe + 3CO2

Explanation:

The balanced reaction of Ferric oxide with carbon to form Iron and Carbon dioxide can be written as follows:

[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]

The moles of iron produced is[tex]16.2*10^{-1}[/tex]

Balanced equation is the one where the number of atoms of each species is same on reactant and product side. In balanced equation mass can neither be created nor be destroyed.

The atoms of Oxygen on reactant side is 3 while on product side is 2 so multiply Ferric oxide by 3 and carbon dioxide by 3

so now our equation becomes

[tex]2Fe_{2} O_{3} +C\rightarrow Fe+3CO_{2}[/tex]

The number of Carbon atoms on left side is one while on right side it is 3 so multiply by 3

[tex]2Fe_{2} O_{3} +3C\rightarrow Fe+3CO_{2}[/tex]

The number of Iron atoms on left is 4 while on right it is 1 so multiply by 4

[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]

From 2 moles of Ferric oxide 4 moles of iron is produced

from 1 mole mole of ferric oxide 2 moles of Iron is produced

From [tex]8.1*10^{-1}[/tex] mole of ferric oxide 2×[tex]8.1*10^{-1}[/tex] moles of iron are produced.

Hence the balanced equation is

[tex]2Fe_{2} O_{3} +3C\rightarrow4Fe+3CO_{2}[/tex]

the number of mole of Iron is [tex]16.2*10^{-1}[/tex]

Learn more about the balanced equations, here:

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#SPJ2

Answer:

These starting substances of a chemical reaction are called the reactants, and the new substances that result are called the products.

Explanation:

Answer:

Atomic Symbol: B

Atomic Number: 5

Element Category: Metalloid

Explanation:

Answer:

hope its helpful. Good luck

Answer:

molten material, seafloor drilling, radiometric age dating and fossil ages, and the magnetic stripes

Explanation:

Explanation:

Foods and beverages that are high in acids wear away the enamel that protects your teeth, a process known as tooth erosion. This changes the appearance of your teeth and opens the door for bacteria that can cause cavities or infection.

You can reduce tooth erosion from what you eat and drink by following these tips: Wait an hour before you brush after eating acidic foods to give your saliva a chance to naturally wash away acids and re-harden your enamel. Limit – or avoid – acidic beverages like soft drinks. If you do indulge, use a straw.

hope this helps you.

Explanation:

Tooth decay starts when pH of the mouth is lower than 5.5 .This is caused when bacteria present in the mouth produce acid by degradation of sugar and food particles remaining in the mouth after eating.

To prevent this, we should clean the mouth after eating food. Using toothpaste, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.

Answer:

atoms as a source of nuclear energy.

noun: the atom

"the power of the atom

that which cannot be cut or indivisible

Answer:

Ammonia is a toxic product of nitrogen metabolism which should be removed from our body.

The urea cycle or ornithine cycle converts excess ammonia into urea in the mitochondria of liver cells.

The urea forms, then enters the blood stream, is filtered by the kidneys and is ultimately excreted in the urine.

Answer:

1. D

2. B

3. A

4. B

5. A

Explanation: just finished quick check

The equation is an example of beta-minus decay.

In a beta-minus decay, an electron is converted to a proton. When this happens, the atomic number of the daughter nucleus increases by one unit above the atomic number of the parent nucleus.

Looking at the equation, we can see that the atomic number of the daughter nucleus increased by one unit above that of the parent nucleus while the mass number of both the parent nucleus and daughter nucleus remained the same. Therefore, a beta-minus decay has taken place.

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Answer:why would i know

Explanation: sorry

Answer:

The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson.

Answer:

A periodic table is a table filled with chemical elements. They are organised by their atomic number and how many electrons each element contains

Answer:

The mass number is the sum of the number of protons and neutrons in an atom. It is a whole number. The atomic mass is the average number of protons and neutrons for all natural isotopes of an element

An element's mass number (A) is the sum of the number of protons and the number of neutrons. ... This approximation of mass can be used to easily calculate how many neutrons an element has by simply subtracting the number of protons from the mass number. Protons and neutrons both weigh about one atomic mass unit or amu

Answer:

study....................

Explanation:

1.Short sessions

2.Sleep well

3.Set goal

4Aim to learn as if you were to teach

Answer:

normal volume of the stomach fluid is 20 to 100 mL and the pH is acidic (1.5 to 3.5).

Explanation:

Answer:

a heterogenous mixture

Explanation:

a heterogenous mixture is a mixture that you can see the different things in it. A homogenous mixture is when you cant see the objects in the mixture

Answer:

To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.

hope this helps <3

Answer:

Volume

Explanation:

Density of a quantity of matter is its mass divided by its volume. External pressure pushes the atoms or molecules closer together and increased temperature usually expands the volume of the material, pushing the molecules apart.