Solve for the molecular/formula mass of the following compounds.

1. Silicon dioxide, SiO2
2. Sodium hydroxide, NaOH
3. Calcium carbonate, CaCO3
4. Sodium carbonate, Na2Co3
5. Silver nitrate, AgNO3
6. Iron oxide, FeO.
7. Phosphoric acid, H2PO4
8. Sodium bicarbonate, NaHCO3
9. Acetic acid, CH3COOH
10. Sodium fluoride, NaF​​

Answer:

percentage is the given amount/total in solution times 100

Answers.

A (3.42/78.2)*100 = 4.37℅ ( 3 significant place )

B 21.98℅

C 13.7℅

Answer:

B.

Explanation:

Density = mass / volume

mass = 100 grams

volume = 8.65 mL

Density = 100 / 8.65 = 11.56 B.

Answer:

The alpha scattering experiment done by Rutherford proved that an atom is not a bowl of positively charge atom, where the electrons were evenly spread out inside it like the plum pudding model. This is because Rutherford discovered that the atoms are mostly empty space with the aplha particles passing straight through the foil. However, a small number of the alpha particles were deflected and bounced back; meaning that the center of the atom is were the mass was mostly concentrated with a positive charge nucleus.

Hope this helps!

The glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.

A chemical reaction involves the combination of two or more substances to yield a new substance which is different from the starting materials. It may also involve the break up a substance.

Since energy is required for a chemical reaction to take place, the glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.

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Wax is formed from the combination of alcohol and fatty acid.

A wax is a type of lipid which is formed from the alcohol and a fatty acid in which alcohol contains about 12-32 carbon atoms while on the other hand, Lauric acid is a fat that is found in many vegetable fats and also use by people as medicine.

Hexadecane is an alkane hydrocarbon which consists of a chain of 16 carbon atoms and 34 hydrogen atoms. Its chemical formula is C₁₆H₃₄.

In conclusion, we can say that wax is formed from the combination of alcohol and fatty acid.

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Answer:

So if we need to react with 88 gm. of copper 2 then at least 3-4 liters.

Explanation:

Answer:

calcium

Explanation:

1s2 2s2 2p6 3s2 3p6 4s2

total number of electrons: 2+2+6+2+6+2=20

the atomic number of the element is 20

the element is calcium

The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 represents the element calcium (Ca).

The electron configuration notation describes the distribution of electrons in the energy levels or orbitals of an atom. In this case, the numbers and letters indicate the specific orbitals and the number of electrons in each orbital.

Breaking it down:

1s2 represents the 1s orbital with 2 electrons.

2s2 represents the 2s orbital with 2 electrons.

2p6 represents the 2p orbital with 6 electrons.

3s2 represents the 3s orbital with 2 electrons.

3p6 represents the 3p orbital with 6 electrons.

4s2 represents the 4s orbital with 2 electrons.

Considering the filling order of orbitals and the number of electrons, the element with this electron configuration is calcium (Ca).

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1 Mev = 1.602 x 10⁻¹³ J

E = hf

h = Planck's constant (6.626.10⁻³⁴ Js)

Input the value:

f = E : h

f = 1.602 x 10⁻¹³ J : 6.626 x 10⁻³⁴ Js

f = 2.42 x 10²⁰ Hz

The iron oxide has 69.9

Answer:

what is th question??????????

Explanation:

if the first one was just O, then:

i) no of moles = mass/ molar mass

2= m/ 16

m = 16*2

m = 32g

ii) the second answer would be the same.

Answer: 3) The amount of water vapor in the air.

3.

It was so hard

Explanation:

Nothing

Answer:

The answer is C I think..

Answer:

Use PV = nRT. Don't forget T must be in kelvin.

Explanation:

Answer:

gas heating

Explanation:

the rising curves are the states rising in tempurature while the flat sequences are the states of matter actually changing. A-b is the solid heating, then b-c is the melting (changing into liquid), c-d is liquid heating, then d-e is vaporizing, leaving e-f being gas heating.

edit: typo

Answer:

gas heating

Explanation:

that's all I hope it helps

Answer:

D. Copper

Explanation:

Less reactive metals like Copper, gold and silver does not react with dilute HCl to produce Hydrogen gas.

Answer:

D. Copper

Explanation:

Copper is less reactive than Hydrogen.

Answer:

b. 1.0

Explanation:

Answer:

Average Molar mass is 114.8u

Explanation:

» From the formula of average Relative Atomic Mass [ RAM ]

[tex]{ \rm{RAM = \sum \frac{(isotopic \: mass \times \%abundance)}{100} }} \\ [/tex]

» We have two isotopes of Indium,

[tex]{ \tt{RAM = \frac{ \blue{(112.9 \times 4.28)} + { \green{(114.9 \times 95.72)}}}{100} }} \\ \\ { \tt{RAM = \frac{11481.44}{100} }} \\ \\ { \underline{ \underline{ \tt{ \: RAM = 114.8\: }}}}[/tex]

Answer:

Explanation:

If any doubt comment your question or what needs clarification.

The compound barium acetate is a strong electrolyte. The reaction when solid barium acetate is put into water is written as

Ba(C₂H₃O₂)₂  -->  Ba ²⁺  +  2 C₂H₃O₂⁻¹

Barium acetate has the molecular formula of Ba(C₂H₃O₂)₂. It is a strong electrolyte. Strong electrolytes are those substances which when dissolved in water dissociates into ions. So when this specific substance is placed into water, this compound simply dissociates into its corresponding ionic forms, that is shown below

Ba(C₂H₃O₂)₂  (s)-->  Ba ²⁺ (aq)  +  2 C₂H₃O₂⁻¹ (aq)

So here We must take note that the 2+ and 1- are the charges of the ion.

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Answer:

I can try helping with math (I take honors math), and can definitely help with reading (I take AP literature composition)

Explanation:

Answer:

i think its P6O15

Explanation:

In the energy graph of an endothermic reaction, the reactants would appear at a lower energy state than the products.

An endothermic reaction is a reaction in which heat is absirbed from the surroundings in order for the reaction to proceed.

In endothermic reactions, the heat content of the products is higher than the heat content of the reactants.

Therefore, in the energy graph of an endothermic reaction, the reactants would appear at a lower energy state than the products.

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Answer:

c) neutrons and protons

Explanation:

The nucleus of the atom contains only neutrons and protons. Electrons are not in the nucleus but outside the nucleus in 'atomic orbitals'.

Answer:

The answer would be B

Explanation:

It has a different definition than the other options

Answer:

An unprocessed chemical is one that is found in nature, such as chemicals from plants, micro-organisms, animals, the earth, and the sea. A synthetic chemical is a chemical that is extracted using a process that does not change its chemical composition but does alter its physical or physiological properties.

Explanation:

Can you mark me brainiest, please?

1. Hg0------Hg+02 is a decomposition reaction

2.Ca+H20------Ca(OH)2+H2 is a combination reaction

3. KBr+ Cl2-----KCl+Br2 is a displacement reaction

please choose me as BRAINLIEST

Answer:

Acts as a sheild so b

Explanation:

Answer

:C- causes predators to lose interest

Explanation:

b was wrong i took the test