Which statement best describes a chemical change?
O A. A substance changes size or phase.
O B. Atoms are made and destroyed.
O C. The nuclei of atoms are rearranged.
O D. Substances form new substances.

answer: 334 J

explain: A total of 334 J of energy are required to melt 1 g of ice at 0°C, which is called the latent heat of melting.

Answer:

false

Explanation:

The particles are held together too strongly to allow movement from place to place but the particles do vibrate about their position in the structure. With an increase in temperature, the particles gain kinetic energy and vibrate faster and more strongly

Answer:

Total of 4 isomers of hepta-2,4-diene are given

Explanation:

pls mark brainliest

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The cart starts out in position A with high potential energy, low kinetic energy, and some thermal energy. As the cart progresses into position B, the kinetic energy begins to increase and the potential energy begins to decrease; as the thermal energy increases as thermal energy from the track is transferred to the cart through friction. Once the cart reaches position C, it has high kinetic energy, low potential energy, and some thermal energy. At position D, the cart has high potential energy, low kinetic energy, and some thermal energy. The potential energy throughout is correlated to gravity, the kinetic energy is correlated to momentum, and the thermal energy is correlated to friction. The potential energy is at its maximum during position A, and its minimum at position C; the kinetic energy is at its maximum during position C, and its minimum at position A; the thermal energy is at its maximum during position B, and its minimum at position A

Answer:

new substances

Explanation:

Atoms of different elements can combine to make new substances. A molecule is formed when two or more atoms join together chemically. If atoms combine that are of two or more different elements, we call that a compound. All compounds are molecules, but not all molecules are compounds.

Answer:

Explanation:

Answer:

As shown in the attachment,

Explanation:

Answer:

A

Explanation:

Answer:

It's the first one I think "it absorbs the other greenhouse gases and becomes more potent

2 moles of HCl solution reacts with one mole Calcium Hydroxide

Ca

(

O

H

)

2

One mole of HCl has mass : 36.5 g/mol, two moles of HCl will have mass, 73 g.

One mole of Ca

(

O

H

)

2

has mass 74.1 g

as per equation; 73 g of HCl reacts with 74.1 g of Ca

(

O

H

)

2

1g of HCl reacts with 74.1g / 73 of Ca

(

O

H

)

2

1g of HCl reacts with 1.015 g of Ca

(

O

H

)

2

Answer:

si

Explanation:

Answer:

798.5 grams

Explanation:

Answer:

Coloured candies?

Explanation:

A. putting a piece of soft iron in an outlet

Answer:  Electrons

Explanation:

A chemical reaction usually only affects elctrons. A chemical reaction usually results in the electrons being transferred or shared. When sodium and fluorine react to produce sodium fluoride, a sodium electron is transferred to the fluorine to produce ionic bonds. This ionic bond exists between the sodium cation and fluoride (fluorine) anion.

Answer:

Molecule

Explanation:

Two or more atoms linked/bonded together is called a molecule.

Answer:

The answer is

D)

radiant, electrical, mechanical

Explanation:

Answer:

Newtons first law

Explanation:

focre=mass x acceleration

Answer:

see explanation

Explanation:

number of moles = mass ÷ relative formula mass

e.g.

Calculate the number of moles of carbon dioxide molecules in 22 g of CO2.

Ar (relative atomic mass) of C = 12, Ar of O = 16

Mr (relative formula mass) of carbon dioxide = 12 + 16 + 16 = 44

number of moles = 22 ÷ 44 = 0.5 mol

Answer:

In shorthand electron configuration, the electron configuration starts with the symbol of the noble gas in the previous period, followed by the additional configuration of the electrons for the given element. For example, aluminum has the atomic number 13, which is the number of protons in the nuclei of its atoms.

Explanation:

Hope this helps.

Answer: True

Explanation:

If you’ve seen a baseball game, you’ve probably also experienced the sight of a ball going up and up, until you begin to wonder when it’s going to come down! Yet every time, the ball does fall back to earth. Why? Gravity is an attractive force that exerts a pull between two objects, such as a baseball and the earth.

Answer:

what do you need help with?

Explanation:

Answer:

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Answer:

ATP

Explanation:

Answer:

Cl2 does not have any charge

Explanation:

But when it is present in its ionic form then chlorine have -1 charge on it. But charge on chlorine varies from -1 to +7

Since we are starting from the number of atoms of Sulfur, we need to know two sets of formulas:

mass  = moles × molar mass

moles = atoms ÷ Avogadro's Number

         ⇒    mass = (atoms ÷ Avogadro's Number) ×  molar mass

 mass = [(100 atoms) ÷ (6.022 × 10²³ atoms/mole)] × (12.011 g/mol)    

           = 1.99 × 10⁻²¹ g

           ≈ 2e-21         [to 1 sig fig]

Considering the relationship between volume and temperature, a gas under constant pressure can only have its volume reduced as a result of a decrease in its temperature.

According to Charles law, at constant pressure, the volume of a gas is directly proportional to its absolute temperature. Thus:

V1/T1 = V2/T2 where V1 = intial volume, V2 = final volume, T1 = initial temperature, and T2 = final temperature.

In this case, T1 = 59.0, V1 = 30.57, and V2 = 21.14

T2 = 21.14 x 59/30.57

                 = 20.05 K

It can be seen that the temperature of the gas has reduced from 59.0 K to 20.05K.

More on gas laws can be found here: https://brainly.com/question/1190311