PLEASE HELP , 2-8 please

Answer:

it is a

watch for kJ vs J as the enthalpy is in kJ and entropy is in J

Explanation:

Answer:

the third one.

Explanation:

According to law of conservation of mass,before and after the reaction copper sulfate and zinc metal interact, an atom of zinc replaces an atom of copper while the sulfate molecule, made of 5 atoms, is unchanged.  there are 5 atoms.

According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .

Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.

Law needs to be modified in accordance with laws of quantum mechanics under the principle of mass and energy equivalence.This law was proposed by Antoine Lavoisier in the year 1789.

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Answer:

Manganese (II) Phosphate

Explanation:

Mn3(PO4)2 is the compound given in this question. Manganese is the metal and hence it will come first in the name. Along with the name of metal it is essential to determine the valency of the metals based on the compound structure.

Here 2 PO4 attaches with 3 Mn

Valence of PO4 is -3

So the total electrons contributed by PO4 is 3*2 = 6

Now Mn has 3 atoms in the compound. Thus, per atom the valency must be 2 in order to satisfy -6 charge of PO4

Thus, valency of Mn is 2

So, the name will be

Manganese (II) Phosphate.

Answer:

this is really insightful, thank you

Explanation:

Answer:

Is is talking about h20 water?

Explanation:

Answer:

2C8H18 + 25O2 ----> 16CO2 + 18H2O

Explanation:

Basically you can first list all your elements from your products and reactants:

C       8 x 2                         C             1 x 16

H      18 x 2                        H             2 x 18

O       2 x 25                      O             (2 x 18) + (2 x 16)

Answer:

12.o44

Explanation:

Molar mass of naoh is 40g/mol

Number of moles=given mass/molar mass

=80/40=2mol

Again no of atoms 2x6.022x10"23=12.044

According to the concept of Avogadro's number, there are 0.527×10²³molecules in  3.5 g of NaOH​.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.Number of molecules= 3.5/40×6.023×10²³=0.527×10²³molecules .

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Answer:

When cells become damaged or die the body makes new cells to replace them. This process is called cell division. One cell doubles by dividing into two. Two cells become four and so on.

Explanation:

Epithelial

I know just one

Answer:

Without the respiratory system your blood would be useless. The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body

Explanation:

Answer:

Scientific Notation: 4.45963 x 109 km (29.811 A.U.) Scientific Notation: 4.53687 x 109 km (30.327 A.U.) By Comparison: If you weigh 100 pounds on Earth, you would weigh 110 pounds on Neptune.

True I hope this helps!!!!!!!!

Explanation:

Kw = [H+][OH-]

[OH] = 1.0 x 10^-11 M

Kw = 1.0 x 10^-14

[H+] = Kw/[OH-] = 1.0 x 10^-14 / 1.0 x 10^-11 = 1.0 x 10^-3 M

The solution is acidic, because [H+] > [OH-].

Answer: See explanation

Explanation:

1. Separation of charges in an object without touching it is (charging by induction).

2. The work done moving a positive test charge between two points in an electric field divided by the magnitude of the test charge is the electric (potential difference).

3. An electric (conductor) is a material through which charges move about easily. (Charging by conduction) is giving a neutral object a charge by touching it with a charged object.

4. A material through which electrical charges does not move easily is an electrical (insulator).

5. The lines providing a picture of the size and strength of the field around a charged object are called the (electric field lines).

6. The property of the space around a charged object that exerts a force on other charged objects is the (electric field).

7. A device that helps determine charge using pieces of metal foil is an (electroscope).

8. The magnitude of the charge of an electron is the (elementary charge)

Explanation: The awnser would be The effects of warmed water on aquatic life

Answer:

5308.16J

Explanation:

Using the formula;

Q = m × cp × ∆T

Where;

Q = change in heat (J)

m = mass of substance (g)

cp = specific heat capacity (4.184 J/g°C)

∆T = change in temperature (°C)

According to the information given in this question;

Q = ?

m = 27.58 grams

cp = 4.184 J/g°C

∆T = 62°C - 16°C = 46°C

Using Q = m × cp × ∆T

Q = 27.58 × 4.184 × 46

Q = 5308.157

Q = 5308.16J

Examples of herbivores are buffalo, elk, some bird species, mice, squirrels, rabbits, and many more.

To solve this, we must know each and every concept behind herbivores and  carnivores. Therefore, herbivores include cows, goats, giraffes, sheep, and zebras etc.

Herbivores, often known as herbivorous animals, are creatures that eat plants, leaves, fruits, and other plant-based foods for nourishment. They are classified as primary eaters and are found at levels 2 or above in the food supply chain.

Herbivores include cows, goats, giraffes, sheep, and zebras. Interestingly, there really are herbivores who specialize in eating on specific parts of the plant; for example, frugivores are herbivores that graze on fruits, whereas folivores are herbivore that eat on leaves.

Therefore, herbivores include cows, goats, giraffes, sheep, and zebras etc.

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Answer:

0.47094837228 moles

Explanation:

silver nitrate=169.87g per mol

80/169.87 = 0.47094837228

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.47moles of silver nitrate are there in 80.00 grams of silver nitrate.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.

Mathematically,

number of moles of substance =given mass of substance ÷ molar mass of substance

Molar mass of 1 mole of silver nitrate=169.87g/mol

mass of silver nitrate= 80g

Substituting all the given values in the above equation, we get

number of moles of silver nitrate=80 ÷169.87

                                                        =0.47moles

Therefore, 0.47moles  of silver nitrate are there in 80.00 grams of silver nitrate.

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Answer:

Wowowoowoww

St0p tHe sPamM MaAn

Okay little brain

Answer:

a

Explanation:

first one i did the test trust me

Answer: Fertilization defintion

Explanation:

the action or process of fertilizing an egg, female animal, or plant, involving the fusion of male and female gametes to form a zygote.

Or giving rise to new indivisual organisms or offspring and initiating development

Answer:

molar mass of caco3 is

100.0869 g/ mol

Answer:

Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water

Explanation:

Sulphuric acid + Magnesium Carbonate

The products are;

Magnesium sulphate, carbon dioxide and water

MgCO3 (s) + H2SO4 (aq) → MgSO4 (aq) + CO2 (g) + H2O (l)

Word Equation;

Sulphuric acid + Magnesium Carbonate → Magnesium sulphate + carbon dioxide + water

Answer:

37.5 L

Explanation:

Initial Volume, V1 = 15L

Initial Pressure P1 = 4.5 atm

Final Pressure, P2 = 1.8 atm

Final Volume V2 = ?

The relationship between these variables is given as;

P1V1 = P2V2

V2 = PIV1 / P1

Inserting the values;

V2 = 4.5 * 15 / 1.8

V2 = 37.5 L

Answer: The new volume is 37.5L

Explanation:

The question is solved using the principle and formula of a gas law known as the Boyle's law. Boyle's law states that provided the temperature remains constant, the volume of a given mass of gas is inversely proportional to its pressure. Expressing the statement mathematically:

P ∝ 1/V, (where p is equal to pressure and V is volume)

Therefore PV = a constant

If a gas at pressure P1 and Volume V1 changes at constant temperature to pressure P2 and volume V2 then:

P1V1 = P2V2.

Using the formula to solve the question:

P1 = 4.5atm

P2 = 1.8atm

V1= 15L

V2 = ?

V2 = P1V1/P2

V2= 4.5 × 15 /1.8

V2 = 67.5/1.8

V2 = 37.5 L

Therefore the new volume is 37.5L

Answer:

The radial velocity curve describes how fast a star is moving in its orbit around a center of mass ( m )

Curve amplitude : This is the maximum value of the radial velocity curve

Radial velocity shape ; The shape of Radial velocity curve is parabolic in nature

Orbital period : Orbital period is the time taken by the star  to make one complete rotation in its orbit

Explanation:

The radial velocity curve describes how fast a star is moving in its orbit around a center of mass ( m ) while Curve amplitude  is the maximum value of the radial velocity curve also The shape of Radial velocity curve is parabolic in nature. and  Orbital period is the time taken by the star  to make one complete rotation in its orbit

Answer:

structure of KF - ionic

Explanation:

Answer:

ionic compond

Explanation:

Sn(ClO3)4

Synthesis reaction~~

Explanation:

Explanation:

Avogadro's number is a very important relationship to remember: 1 mole = 6.022×1023 6.022 × 10 23 atoms, molecules, protons, etc. To convert from moles to atoms, multiply the molar amount by Avogadro's number.