Please help and if you can please explain how you got that answer

Answer:

C

Explanation:

Step 1:  Solve

We know water has the formula of H20,  if we have more molecules of water we don't touch the subscripts because that would change the substance so we can only add coefficients to the formula

1. Antelope Canyon was formed by the erosion of Navajo Sandstone.

2. The appearance of water is determined

by the way the water molecules are moving.

3. Moist rising air near the Equator cools and condenses into clouds and, later, rain.

Answer:

An example is the kinetic theory of matter.

According to this theory, all matter consists of tiny particles that are in constant motion.

Particles move at different speeds in matter in different states.

Answer:

(C). is the answer, I think

Fluorine in gaseous form is a substance which has atoms far away from one another has ΔHf as 0 kj/mole.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether  it is solid,liquid , gas is made up  of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral particles  and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

•the maintenance of a stable internal environment

Hope this helps :)

Answer:

2.01% to the nearest hundredth.

Explanation:

Percent error =[ (8.96-8.78) / 8.96]* 100

= 0.020089 * 100

= 2.0089 %

The Percent error is 2.01% to the nearest hundredth.

Suppose the actual value and the estimated values after the measurement are obtained. Then we have:

Error = Actual value - Estimated value

To calculate percent error, we will measure how much percent of actual value, the error is, in the estimated value.

[tex]\rm Percent \: Error = |\dfrac{Error}{Actual value}|\times 100 \\\\[/tex]

[tex]Percent \: Error = | \dfrac{\text{(Actual Value - Estimated Value)}}{Actual value}|\times 100 \\[/tex]

(here |x| is such that it makes x non negative, thus, |-5| = 5, and |5| = 5)

WE have been given a cube of pure copper when you calculate the density using your measurements, you get 8.78 grams/cm3. Copper's accepted density is 8.96 g/cm3.

Percent error =[ (8.96-8.78) / 8.96]* 100

= 0.020089 * 100

= 2.0089 %

Hence, the Percent error is 2.0089 %.

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Answer:

We have the wavelength which is 10,speed/velocity=340 and frequency=?.

The formula is velocity=frequency × wavelength.

340=f × 10.

340=10f.

frequency=34hertz.

Answer:

34hertz

Explanation:

We have the wavelength which is 10,speed/velocity=340 and frequency=?.

The formula is velocity=frequency × wavelength.

340=f × 10.

340=10f.

frequency=34hertz.

Answer:

The specific heat and heat of vaporization of water will be very high.

Explanation:

The strength of the hydrogen bonds and the attractions that they create between water molecules makes it much harder for water to increase in temperature.

This is because the bonds need to be broken before the water can vaporize (heat of vaporization) or increase in temperature (specific heat)

Answer:

1043

Explanation:

Convert 104.3 Centimeter to Millimeters (cm to mm) with our conversion calculator and conversion tables. To convert 104.3 cm to mm use direct conversion formula below.

104.3 cm = 1043 mm.

Answer:

1043

Explanation:

Multiply 104.3 by 10

Answer:

enr are those resources which are present in limited quality and can be use completely used up by human activities are called enr .example coal petrol

Answer:

28g/ dm³

0.5 M

Explanation:

1dm³= 1000cm³

Let's convert the volume to cm³.

Volume of solution

= 200cm³

= (200÷1000) dm³

= 0.2 dm³

Concentration in g/dm³ means the amount of solute, KOH, in 1 dm³ of solution.

In 0.2 dm³, there is 5.6g of KOH.

Thus in 1 dm³, amount of KOH

= 5.6 ÷0.2

= 28g

Concentration in g/dm³ is 28g/dm³.

Molarity is a concentration unit. It is the number of moles of solvent in 1 L or 1dm³ of solution. Since we have already found the mass of KOH in 1dm³ of solution, we will use dm³.

1dm³ ----- 28g of KOH

moles= mass ÷mr

Molecular mass of KOH

= 39 +16 +1

= 56

1dm³ ----- 28 ÷56= 0.5 moles of KOH

Thus, concentration in molarity is 0.5M.

(Unit for molarity is M)

Answer: DILUTE SATURATED

Explanation:

Answer:

b. saturated

Explanation:

(:

a = d/(b + c)

a(b + c) = d

a = d/(b + c)

Answer:

[tex]\huge \boxed{a= \frac{d}{b+c} }[/tex]

[tex]\rule[225]{225}{2}[/tex]

Explanation:

[tex]a(b+c)=d[/tex]

Dividing both sides by (b + c).

[tex]\displaystyle a= \frac{d}{(b+c)}[/tex]

[tex]\rule[225]{225}{2}[/tex]

Answer:

The answers to your questions are given below

Explanation:

1. KClO3 => Potassium trioxochlorate (V)

Thermal decomposition of KClO3.

When we heat potassium trioxochlorate (V), KClO3, it will slip into two producing potassium chloride, KCl and oxygen gas, O2 as shown below:

2KClO3(s) —> 2KCl(s) + 3O2(g)

Note: the above reaction will occur faster and at a lower temperature in the presence of manganese (iv) oxide as catalyst.

2a. Determination of the number protons and neutrons in Nitrogen–14.

Nitrogen–14 has the following:

Mass number = 14

Atomic number = 7

Proton =?

Neutron =?

Atomic number of an atom is simply the proton number. Therefore,

Proton = Atomic number

Atomic number = 7

Proton = Atomic number = 7

Proton = 7

Mass number = Proton + Neutron

Mass number = 14

Proton = 7

Neutron =?

14 = 7 + Neutron

Collect like terms

Neutron = 14 – 7

Neutron = 7

Therefore, Nitrogen–14 has 7 protons and 7 neutrons.

2b. Determination of the number protons and neutrons in Nitrogen–15.

Nitrogen–15 has the following:

Mass number = 15

Atomic number = 7

Proton =?

Neutron =?

Atomic number of an atom is simply the proton number. Therefore,

Proton = Atomic number

Atomic number = 7

Proton = Atomic number = 7

Proton = 7

Mass number = Proton + Neutron

Mass number = 15

Proton = 7

Neutron =?

15 = 7 + Neutron

Collect like terms

Neutron = 15 – 7

Neutron = 8

Therefore, Nitrogen–15 has 7 protons and 8 neutrons.

Answer:

I think it is b. B (Atomic No. 17)

Answer:

Heat Energy... I am pretty sure?

Explanation:

There is a law called conservation of energy which states that energy can neither be created nor be destroyed. It can be only transferred from one form to another form. Therefore, heat energy  is released when we burn natural gas.

Energy transfer is a phenomenon in which energy transfer from one matter to another matter. Energy can be transferred in two forms that are by doing work or by transferring heat.

Heat can be transferred by three ways conduction, convention and radiation. In conduction, when two object are in direct contact, transfer of molecules takes place. Convection is the flow of heat from one layer of liquid to another layer. Heat energy  is released when we burn natural gas. This reaction is called combustion reaction.

Therefore, heat energy  is released when we burn natural gas.

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Answer:

True

Explanation:

Any substance dissolving a solid (salt) in liquid (water) is a physical change.

Salt in water, is a physical change because only the state of the matter has changed.

Answer:

true

Explanation:

uwu

Answer:

25.60% of NaCl in the mixture

Explanation:

With the amount of AgCl produced we can now the moles of Cl⁻ = Moles of NaCl. With these moles we can now the mass of NaCl and, as total mass was 3.613g, it is possible to determine mass percent of NaCl in the mixture.

Moles NaCl:

2.268g AgCl * (1mol / 143.32g AgCl) = 0.01582 moles AgCl

Molar mass AgCl 143.32g/mol

0.01582 moles AgCl = Moles Cl⁻ = Moles NaCl

Mass NaCl (Molar mass: 58.44g/mol):

0.01582 moles NaCl * (58.44g / mol) = 0.9248g NaCl in the mixture

Mass percent:

(0.9248g NaCl / 3.613g) * 100 =

Answer:

c

Explanation:

because the water is needed to wet the sand to keep d reaction safe

Answer:

3.785e+6

Explanation:

Answer:

The answer is

210.6+14.57=225.17mm.

Answer:

Explanation:

0.15 MG +1.15 MG +2.051 MG

Answer:

34

Explanation:

Answer:

Exposure to oxygen (especially when combined with sunlight) alters the molecular structure of lignin, causing a change in how the compound absorbs and reflects light, resulting in the substance containing oxidized lignin turning a yellow-brown color in the human visual spectrum.

Answer:

the electron is outermost

Explanation:

shell of a flourine are closer together .

Answer:

The electron gain enthalpy of chlorine is more negative than fluorine. This is because fluorine is smaller in size than chlorine. Thus the extent of electron-electron repulsion would be more in fluorine than in chlorine. Because of this, the incoming electron would face more repulsion in fluorine than in chlorine.

Explanation:

Answer: 7.46 x 10-4

Explanation:You move the decimal place 4 times. For any scientific notation question in the future, look at the answer choices and beside the answer choices work it out. By working it out just take the rounded number (which in this case is 7.46) and go to the decimal and move it however many times it states in the 10 (10-4, move 4).

Answer:

The correct answer would be B.

Fluorine (a halogen) is very reactive because it has 7  outer shell electrons.

Explanation:

It's located at the top of the Halogen Group in the periodic table and it's the most electronegative element, this makes it very reactive.

I hope this helps you:)

Fluorine (a halogen) is Very Reactive because it has 7 outer shell electrons.Hence, option (D) is correct.

The halogens are a group in the periodic table consisting of five or six chemically related elements: fluorine, chlorine, bromine, iodine (I), and astatine.

The artificially created element 117, tennessine, may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17

Therefore, Fluorine (a halogen) is Very Reactive because it has 7 outer shell electrons. Hence, option (D) is correct.

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Answer:

Manipulated (independent) Variable and Responding (Dependent) Variable

Answer:

A molecular formula indicates the ratio of atoms in a molecule.

Explanation:

A molecular formula or chemical formula is a representation or indication of the number of atoms in a particular compound or molecule have in a specific specific proportion.

These are represented by the symbols of elements, numbers of atoms present and sometime other symbols. For example in water molecule there is one atom of oxygen and two hydrogen atoms.

Thus, the correct answer is : molecular formula