20 points! Help please

Answer:

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Answer:

helium formula He

Ammonia formula NH3

methane formula CH₄

chlorine formula  Cl-

Explanation:

Answer:

TYPES OF HEATING: There are three types of heat transfer: conduction, convection, and radiation.

OCEAN ANSWER: Ocean currents are driven by a range of sources: the wind, tides, changes in water density, and the rotation of the Earth. The topography of the ocean floor and the shoreline modifies those motions, causing currents to speed up, slow down, or change direction.

Explanation:

the answer is basicly the person who answered above me

Explanation:

Answer:

  False

Explanation:

An element is named according to the number of protons in the nucleus. If it gains or loses a neutron, it becomes a different isotope of the same element.

The given statement is false.

Answer:

Explanation:

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Answer:

P-waves (primary or compressional waves) are longitudinal or compression waves, able to move through solids, liquids, and gases at speeds ranging between 300-5,000 metres per second. As they travel through rock, they move particles back and forth in the same direction that the wave is moving

Explanation:

Answer:

the answer is d.

Explanation:

because metals are refers to natural elements that are hard, shiney, opaque, and dense. nonmetals implies thise chemical substances that are soft, non-shiney, transparent and brittle.

Answer:

Clastic sedimentary rocks are formed from rock fragments or clasts; chemical sedimentary rocks precipitate from fluids, and biochemical sedimentary rocks form as precipitation from living organisms.

Sedimentary rock is classified into two groups based on how they form. They are clastic and chemical. Clastic sedimentary rock is formed as bits of weathered rock become cemented together. Because all kinds of rock are subject to weathering many different minerals can make up this group of rocks.

go here is the answer key

http://msschmidly.weebly.com/uploads/2/6/2/0/26201624/gases_review___calculations.pdf

According to ideal gas equation, there are 271472.7 moles of gas present in a gas trapped within a 37.0 L vessel at 80.0°C at a pressure of 2.50 atm.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons .Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Substitution of values in ideal gas equation gives,n= 2.5×37/8.314×353=271472.7 moles.

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Answer:

increases [H+]

Explanation:

Answer:

0.008 ÷ 51.3 = 0.00015594541910331380.00015594541910331382Round 0.0001559454191033138 → 0.0002 (Sig Figs: 1)

Answer:

Atomic mass of Hydrogen is 1.00784 u

Atomic mass of Carbon is 12.0107 u

Explanation:

Answer:

1

Explanation:

calcium react with sulphuric acid to produce carbon dioxide which turns lime water milky

Answer:

C: 1 mol F2/38 g F2

Explanation:

The reaction equation is;

N2 + 3F2 = 2NF3

Now, to know how many grams, of N2 is needed to completely react with 105 g F2 and since the molar mass of N2 is 28.02 g/mol, Molar mass of F2 is 38 g/mol, number of moles attached to N2 and F2 in the reaction are 1 and 3 moles respectively, then we will have;

105 g F2 × 1 mol F2/38 g F2 × 1 mol N2/3 mol F2 × 28.02 g N2/1 mol N2

Option C is Thus correct

Answer:

b

Explanation:

I don't know that is what the outcome is I think

Answer:

Noble gas

Explanation:

Noble gases are complete octets ( have 8 valence electrons) Helium is a member of this family.

Answer:

26.83333

Explanation:

Answer:

B

Explanation:

The other answers dont make any sense.

Answer: C is the answer

Answer:

The molarity of a solution is "25 M".

Explanation:

The given values are:

Moles of solute,

= 12.5 g

Volume of solution,

= 500 mL

i.e.,

= 0.5 L

Now,

The molarity will be:

=  [tex]\frac{Number \ of \ moles \ of \ solute}{Volume \ of \ solution}[/tex]

On substituting the values, we get

=  [tex]\frac{12.5}{0.5}[/tex]

=  [tex]25 \ M[/tex]

The T in the equation G = H - TS is the temperature in kelvins at which the reaction is happening. The correct option is A.

Temperature is the measurement of the coldness or hotness of a body. The SI unit of the temperature is kelvin and Celsius. The high-temperature regard hotness and the low temperature means a cold area.

G = H – TS is the equation to calculate Gibbs free energy.

Where G = Gibbs free energy

H = enthalpy

T = temperature

S = entropy

Gibbs free energy is the total amount of energy that is taken to do the work in a closed system. The entropy is the total amount of energy that is not useful for work. The temperature is the variable in this equation.

Thus, the correct option is A. The temperature in kelvins at which the reaction is happening.

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Answer:

d

Explanation:

the partial charges of the molecule

Answer: 2.00 atm

Explanation:

P1/T1 = P2/T2

1.3317/273 = P2/410

P2 = 2.00 atm

Answer:

the velocity is 25 m/s

Explanation:

The computation of the velocity is shown below:

As we know that

Magnitude of Momentum = (mass) × (speed)

75 kg. m/s = 3 kg × speed

So, the speed is

= 75 ÷ 3

= 25 m/s

hence, the velocity is 25 m/s

Answer: 140.4 grams. One mole would be 58.5 grams, or 23 (the atomic mass of sodium) + 35.5 (the atomic mass of chlorine)

Explanation:

Answer:

3.4 * 58.5 = 198. 9 grams

Answer:

1. An incline plane is a flat plan put at a positive angle with the ground (assuming the ground is horizontal)

2. Work equals force times distance. And since the hypotenuse of a triangle (the ramp) is longer than the opposite side (equivalent to lifting an object vertically), the increased distance decreases the force needed to do a certain amount of work.

3. We usually use incline planes to elevate large objects.  Since it takes less force to move certain things up inclines rather than picking them up, it is much simpler to move an object up an incline.

4. You could decrease the force by making the plane's angle with the ground smaller.

5. I don't know; I wasn't in your class :)

6. Ramps, wheelchair entrances, inclined rooves etc.

7. No. A plane has to be relatively flat; therefore stairs are neither a plane, nor an inclined plane.

Answer:

la photosintesis viene de la clorofila de la planta

Answer:

it's O2 since the oxygen has 6 valence electrons and it can make 2 covalent bonds

Answer:

we say it has a speed of 2m/s

Answer:

hope this helps

Explanation:

Water was on earth with the dinosaurs and almost at the very start.

Water starts anywhere from clouds to ponds

I choose ponds, water evaporates from the sun and moves its way through the air being collected into clouds in the atmosphere, clouds are evaporated water molecules, then the water combines to form rain wich then end up on a hill and travel back to a water source or goes into the ground and makes groundwater and if there is enough rain overtime will form a pond.