Pls help me with this will mark brainliest

Answer:

It continuously decreases.

Explanation:

the thermal motion makes the electrons to collide and disturb the free flow. Thus, conductivity is decreased.

Answer: no free electrons

Explanation: Diamond is very hard due to the strong covalent bonds and rigid tetrahedral 3d arrangement. It does not conduct electricity, as there are no electrons free to move and carry charge through the structure.

Answer:

B

Explanation:

Well, the cells are going through mitosis, which means that when the divide, they are going to be identical sister cells. Anyways, they are

Respiration occurs in the mitochondria

Answer:

mitochondria

Explanation:

Respiration happens in the cells of plants, animals and humans, mainly inside mitochondria.

Answer:

Explanation:

Pv = n RT

P =7.65, T= 310K, for glucose n = moles= weight/molar mass= weight/180, R is gas constant

7.65* V =W/180 *0.0821 * 310

w/v= 7.65*180/0.0821*310 = 1377/25.45 = 54.10 =5.4%

Answer:

Energy is absorbed by the atom.

Explanation:

Answer:

Glucose and oxygen is produced during photosyntheis

Explanation:

Carbon dioxide and water are required for photosyntheis producing oxygen and glucose

Answer:

C.Glucose and oxygen

Answer:

A chemical solution is defined as a homogeneous mixture of two or more substances. There are two components of chemical solution that include solute and solvent.

Solute is the component that get dissolved in another substance and solvent is the substance that dissolve solute.

For example:  carbon dioxide in water. Where carbon-dioxide is solute and water is solvent.

Answer:

Mass of a given chemical element or compound divided by the amount of substance.

(g/mol)

Answer:

The total energy to break all the bonds in 1 mole of 1-propanol, C₃H₈O, is 4411 kJ/mol

Explanation:

We note that propanol, C₃H₈O is also known as 1-propanol is written as follows;

CH₃CH₂CH₂OH which gives

CH₃-CH₂-CH₂-OH

Hence, the total number of bonds are;

C-H Bonds = 3 + 2 + 2 = 7

C-O Bonds = 1

O-H Bond = 1

C-C Bonds = 2

The bond energies are as follows;

C-H Bonds = 413 kJ/mol

C-O Bonds = 358 kJ/mol

O-H Bond = 468 kJ/mol

C-C Bonds = 347 kJ/mol

Energy required to break the bonds in 1-propanol is therefore;

C-H Bonds = 413 kJ/mol × 7 = 2,891 kJ/mol

C-O Bonds = 358 kJ/mol × 1 = 358 kJ/mol

O-H Bond = 468 kJ/mol × 1 = 468 kJ/mol

C-C Bonds = 347 kJ/mol × 2 = 694 kJ/mol

The total energy to break all the bonds in 1 mole of 1-propanol = 4411 kJ/mol.

Answer:

D is the correct answer acidity

Explanation:

pH is the logarithmic measurement of the H3O+-concentration in water solutions.

By definition: pH = -log[H3O+]

Example: [H3O+] = 1.0*10-7 mol/L in neutral, pure water (at 25oC), so

pH = -log(H3O+) = -log(1.0*10-7) = 7.0

Answer:

They form K₂O (Potassium oxide) and HCl (Hydrochloric acid). This is because K and H are positively charged and O and Cl are negatively charged and cations only bond with anions.

The given question is incomplete. The complete question is as follows.

Pure potassiom hydrogen phthalate is used for standardization of the sodium hydroxide solution. Suppose that the potassium hydrogen phthalate is not completely dry. Will the reported molar concentration of the sodium hydroxide solution be too high, too low, or unaffected because of the moistness of the potassium hydrogen phthalate? Explain please.

Explanation:

When potassium hydrogen phthalate is not completely dry then it means there will be some water present in it. According to this, actual potassium hydrogen phthalate is diluted because of the presence of water molecules.

Hence, 1 mole of potassium hydrogen phthalate needs 1 mole of NaOH. And, at the equivalence point according to the concept of moles:

No. of moles of potassium hydrogen phthalate = No. of moles of NaOH

Also, the titration of potassium hydrogen phthalate concentration is less because of the presence of water then the number of moles of NaOH calculated will be less.

Thus, we can conclude that the molar concentration of the sodium hydroxide solution be too low.

Answer:

C. The second equation must be halved

D. The second equation must be reversed

E. The third equation must be halved.

Delta Hrxn= 131.3 kJ

Explanation:

The correct answer is -582 KJ.

What is the enthalpy of reaction?

What is the overall enthalpy of the reaction?

Learn more about enthalpy below,

https://brainly.com/question/27207707

#SPJ2

Answer: A. 490.48mol

Explanation:

Using the ideal gas equation; PV =nRT

where P = Presssure = 200 atm

          V = Volume = 60L

          n = Number of moles

          R = Gas constant = 0.08206 L.atm/mol/K

          T = Temperature = 25 °C  + 273 = 298K

Make "n" the subject of the formular;

n =  PV /  RT

   =  200   x    60   /    0.08206 x  298

   =  490.73  mol, which is closest to  option A. 490.48mol

The reason we should store phosphorous in water is because it will ignite on contact with air

Answer:

changing while growing

Explanation:

Answer: the answer is a

Answer:

0.75 M

Explanation:

Molarity = moles of solute / liters of solution

so;

Molarity = [tex]\frac{1.5 Moles}{2.0 Liters}[/tex]

According to molar concentration, the molarity of this solution is 0.75 molar.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Substitution in formula gives, molarity= 1.5/2=0.75 M

Thus,  the molarity of this solution is 0.75 molar.

Learn more about molar concentration,here:

https://brainly.com/question/15532279

#SPJ2

Answer:

C8H16

Explanation:

First thing to do here is to calculate the molar mass of the compound

Mathematically;

molar mass = mass/number of moles

we can calculate the number of moles using the ideal gas equation

Mathematically;

PV = nRT

n = PV/RT

where p is the pressure at 5 atm

V is the volume at 568 ml = 568/1000 = 0.568 L

R is the molar gas constant which is 0.0821

T is the temperature which is 120+ 273 = 393k

Inserting these values into the equation, we have

n = (5 * 0.568)/(0.0821 * 393)

n = 0.088 moles

So the molar mass = 10/0.088

= 114 g/mol

Now let’s go to the percentages

C = 84.2/12 = 7.016666666666667

H = 15.8/1 = 15.8

divide by the smallest

C = 7.016666666666667/7.016666666666667 = 1

H = 15.8/7.016666666666667 = 2 approximately

The empirical formula is CH2

So for the molecular formula, we have;

(12 + 2)n = 114

14n = 114

n = 114/14 = approximately 8

So the molecular formula of the liquid will be (CH2)n = C8H16

Answer:

C) protons and neutrons

Explanation:

im pretty sure it is c

Answer:

A)

Explanation:

Increasing of oxidation number shows that the process is oxidation(or losing of electrons).

-1 to +2, oxidation number is increased. This is an oxidation process.

-  

C.

i cant explain why..................

Answer:

B. Chemical weathering

Explanation:

Erosion is the process whereby the soil and rocks are washed away by wind, water, ice or gravity.

Weathering is the process of weakening and breaking down of rocks and minerals either by non-living (abiotic) or living (biotic) factors or by both, such as temperature changes, plants and animals, acids, salts and water, etc.

From the above definitions, it can be seen that acid wearing away limestone is a rock weathering process by a non-living agent, an acid.

Option A is wrong because the process is weathering

Option B is correct because an acid is a chemical and the process involved is weathering

Option C is wrong because an acid is non-living

Option D is wrong because the process involved is weathering

Answer: Aluminum Carbonate

Explanation:

Answer:

Aluminum carbonate.

Explanation:

It is an aluminum salt form of carbonic acid.

Answer:

The answer is animals

Explanation:

Plants and fungi have a cell wall, and although most bacteria lack a cell wall, the question is asking in which kingdom do ALL organisms lack a cell wall. Hope this helps.

Answer:Bacteria

Explanation:

Explanation:

solid liquid

solid gas

liquid solid

[H+]=3.98x10^-9

[H+]=10^-pH=10^-8.4

[H+]=10^-11, base

[H+]=10^-pH=10^-11

A solution with a pH of more than 7 is basic.

Lemon juice because it is more acidic

pH of lemon juice: 2.5

pH of vinegar: 3.3

Since the pH of lemon juice is lower, it is more acidic and will be more effective at removing the basic deposits.

Answer:

The reaction of an acid and a base is called a neutralization reaction. ... However, in the reaction between HCl(aq) and Mg(OH) 2(aq), additional molecules of HCl and ... First, we will write the chemical equation with the formulas of the reactants ... The chloride ions are the only spectator ions  I THINKS

Explanation:

Answer:

About 7.109g

Explanation:

25000mL is the same as 25 liters.

[tex]PV=nRT \\\\0.5 (25)=n (0.0821) (300) \\\\n\approx 0.508[/tex]

Multiplying this by the molar mass of nitrogen, you get about 7.109 grams of nitrogen. Hope this helps!