ASAP (2 questions & are iv the pic ) will get BRAINIEST

Answer:

Sodium has an atomic number of 11 while potassium has an atomic number of 19

• Despite smaller atomic number, sodium is denser than potassium

• Potassium reacts much more violently with water

• While excess of sodium is harmful for us, low levels of potassium have also been found to be associated with certain disorders of lungs and heart.

Explanation:

found this on the internet

Answer:

exist in fixed amounts

Explanation:

The only attribute that describes nonrenewable resources is the existence in fixed amounts.

Nonrenewable resources are limited in amount and depleted at a much faster rate than they are naturally replaced. Even when they are to be replaced, it cannot be done within a short period.

An example is crude oil which exists as natural deposits deep in the ground. The world's crude oil deposit is limited and cannot be replaced at a rate they are being used by man if at all it can be replaced.

An attribute of nonrenewable resources' is they exist in fixed amount. The  correct option is A.

Non-renewable resources are those resources which are produced in millions of years, and are limited. Once these resources extincted, it will take millions of years again to produce these resources.

Thus, the correct option is A, exist in fixed amount.

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Answer:

a I guess

Explanation:

Fertilizers supplement the soil with macronutrients needed in large amounts: nitrogen, phosphorous and potassium. ... Inorganic fertilizer, also referred to as synthetic fertilizer, is manufactured artificially and contains minerals or synthetic chemicals. so no

Explanation:

Answer:

im 14 years old.

Explanation:

Answer:

CO2

Explanation:

we can see one carbon atom and 2 oxygens meaning this is Carbon dioxide or CO2

Answer:

Answer is in the photo

Explanation:

Have a nice day and if the photo isn’t visible let me know! :)

The balance chemical equation is as,

[tex]2NaCl[/tex] → [tex]2Na + Cl_{2}[/tex]

The 30.1 grams of chlorine are produced when the sodium chloride decomposes and produces 19.5 grams of sodium.

Calculation,

22.99 g of sodium present in 1 mole of sodium atom.

In 19.5 g  of sodium = 19.5 g× 1 mole / 22.99 g = 0.85 mole

The mole ratio = 2:1

It means 2 mole of sodium produce along with  1 mole of chlorine when sodium chloride decomposed.

So, number of mole of chlorine when 0.84 mole of sodium produce =  0.85 mole×1 mole/ 2 mole = 0.424 mole

number of mole of chlorine = given mass/molar mass of [tex]Cl_{2}[/tex] = 0.424

Given mass of [tex]Cl_{2}[/tex] = molar mass  of [tex]Cl_{2}[/tex]×  number of moles of [tex]Cl_{2}[/tex] = 70.9×0.424 = 30.1 gram

The symbolic representation in which number of atoms in reactant side is equal to number of atoms in product side.

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Half reaction :

Oxidation

Cu ⇒ Cu²⁺ + 2e⁻

Reduction

2Ag⁺+ 2e⁻ ⇒2Ag  

Given

Reaction

Cu+2AgNO₃⇒Cu(NO₃)₂+2Ag

Required

Oxidation and reduction half-reactions

Solution

Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.

Cu ⇒ Cu²⁺ + 2e⁻

0 to +2

2Ag⁺+ 2e⁻ ⇒2Ag  

+1 to 0

Answer:

because it is two substances reacting together to create a new substance

Explanation:

when iron rusts, iron molecules react with the oxygen molecules creating iron oxide aka rust.

Answer:

C. 0.1 mol of V₂O₅

Explanation:

Number of moles of oxygen atoms present in each molecule is derived as follows:

A. Number of molecules of CO₂ in 12.044 * 10²³ molecules of CO₂ = 12.044 * 10²³/6.022 * 10²³ = 2 moles of CO₂ molecules

Each molecule of CO₂ contains 2 atoms of oxygen. Therefore, number of moles of oxygen atom present in 2 molecules of CO₂ = 2 * 2 moles of oxygen atoms = 4 moles of oxygen atoms.

B. Number of moles of O₃ molecules in 12g of O₃ = mass of O₃/molar mass of O₃

molar mass of O₃ = 48 g/mol

Number of  moles of O₃ molecules = 12/48 = 0.25 moles of O₃

There are 3 atoms of oxygen in a molecule of O₃, therefore number of moles of oxygen atoms present in 12 g of O₃ = 3 * 0.25 = 0.75 moles of oxygen atoms

C. There are 5 oxygen atoms in a molecule of V₂O₅

0.1 mol of V₂O₅ contains 0.1 * 5 moles of oxygen atoms = 0.5 moles of oxygen atoms.

D. mass of 10 mL of H₂O = 10 g since the density of H₂O = 1 g/mL

molar mass of H₂O = 18.0 g/mol

Number of moles of H₂O in 10 g of H₂O = 10/18 = 0.56 moles

There are 1 atom of oxygen in a molecule of H₂O, therefore, number of moles of oxygen present in 10 g of H₂O = 0.56 * 1 = 0.56 moles of oxygen atoms

Therefore, 0.1 mole of V₂O₅ contains the least number of oxygen atoms.

Answer:

A. AgNO₃ + NaCl —> AgCl + NaNO₃

B. Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂

C. 3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃

Explanation:

The equation given in the question above can be balanced as follow.

A. AgNO₃ + NaCl —> AgCl + NaNO₃

The above equation is already balanced.

B. Mg(NO₃)₂ + KOH —> KNO₃ + Mg(OH)₂

There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before KOH as shown below:

Mg(NO₃)₂ + 2KOH —> KNO₃ + Mg(OH)₂

There are 2 atoms of K on the left side and 1 atom on the right side. It can be balance by writing 2 before KNO₃ as shown below:

Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂

Thus, the equation is balanced.

C. LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃

There are 3 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 3 before LiOH as shown below:

3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃

There are 3 atoms of Li on the left side and 1 atom on the right side. It can be balance by writing 3 before LiNO₃ as shown below:

3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃

Thus, the equation is balanced.

Answer:A

Explanation:

I just took the test

Answer:

Because according to VSEPR theory lone pair occupies more space than bond pair.

Explanation:

Lone pair of electrons repels from bonded pair of electrons than that between bond pair of electrons itself. Hence, molecules attain a geometry in which the repulsive force is minimum.

The lone pair of electrons are pair of electrons which are not involved in bonding in any occasion but can be donated through coordinate bonds in some compounds.

Oxygen, nitrogen  etc. contains lone pair of electrons. According to VSEPR theory, the lone pair -lone pair repulsion > lone pair -bond pair > bond pair-bond pair repulsion.

Therefore, these electron pairs are aligned around the central atom in such a way that the repulsive force between the electron clouds are minimized.

For example, if consider hybridization of water molecule, it must acquire a tetrahedral  shape, but the lone pairs will align axial  and will assume a bent shape.

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%C = 40

%H = 6.67

%O = 53.33

Given

Glucose  C₆H₁₂O₆

Required

The percent composition

Solution

MW Gulucose = 180 g/mol

Ar C = 12 g/mol

Ar H = 1 g/mol

Ar O = 16 g/mol

%C = 6.12/180 x 100% = 40%

%H = 12.1/180 x 100% = 6.67%

%O = 6.16/180 x 100% = 53.33%

Answer: 27 is A and 28 is C.

Explanation: I’ll explain 28 but not 27 because that’s just definitions.

In CuSO4 there is a Cu, an S, and 4 O molecules. Add them up you get 6.

Answer:

7. 5km/h

8. 10km/h

I just need to add characters so i can post

Answer:

2. Periods

Explanation:

The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.

The number is 6.022 x 10^23 atoms/mol.

Answer:

a. forces cause bonds to form

Answer:

electrolytic reaction; oxygen and hydrogen combine to form water, producing electrical energy and releasing heat.

Explanation:

Answer:

The moving train

Explanation:

Kinetic energy is energy being used right now. So, the only object using energy right now is the moving train

Good luck on the rest of the test!

The molarity of a Sodium carbonate solution : 0.373 M

Given

32.52 g Na₂CO₃

822 ml of solution = 0.822 L

Required

The molarity

Solution

Molarity shows the number of moles of solute in every 1 liter of solution.

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

mol of solute = mol of Na₂CO₃ :

= mass : MW Na₂CO₃

= 32.52 g : 106 g/mol

= 0.307

Molarity :

= n : V

= 0.307 mol : 0.822 L

= 0.373 M

Answer:

71.85 moles

5.99 moles

O.17 moles

Explanation:

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Answer:

4th option: 0.17 moles

Explanation:

The number of moles of a substance can be calculated using the following formula: Mole= Mass ÷Mr

The Mr of a compound is its molecular weight, which is the sum of the relative atomic masses of the atoms it is made up of.

Find the Mr using the periodic table:

Mr of FeO

= 55.8 +16

= 71.8

Calculate number of moles:

Amount of FeO

= 12 ÷71.8

= 0.17 moles (2 d.p.)

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Answer: Fe

Explanation: Fe (Iron) is the only element since it involves only 1 atom. The other options are compounds, since there are more than 2 atoms bonded together.

Answer:

b

Explanation:

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Answer:c

Explanation:

Answer: Sediment Transport by Wind

Explanation: Like flowing water, wind picks up and transports particles. Wind carries particles of different sizes in the same ways that water carries them (Figure below). Tiny particles, such as clay and silt, move by suspension. They hang in the air, sometimes for days.

Answer:

........................................

the force that pulls falling objects is gravity.

Answer:

If someone is suffering from the problem of acidity after overeating Baking soda solution would be suggested as a remedy as it is basic in nature, it neutralises excess acid in the stomach.