At -15°C, water is a:
solid,liquid,gas

Answer:

Hydrogen

Explanation:

im not 100% sure , but let me know

Answer:

D) Hydrogen

Explanation:

Hydrogen is a way of storing or transporting energy. You need to make it or extract it before you can use it.

Answer:

All elements are pure substances, Each element is made up of the same type of atom.

Answer:

(see below)

Explanation:

Using process of elimination:

A) lose energy

When a liquid freezes into a solid, the particles move a lot slower because the once-flowing particles are now about to be stuck in place, barely vibrating in its structure.

So, yes, they has lost energy, but there can be a better answer.

B) gain energy

When a liquid freezes into a solid, the particles move a lot slower, so there is no way there is more energy now. If there was to be more energy, it would be a gas now.

So, no, they did not gain energy.

C) move faster

When a liquid freezes into a solid, the particles move a lot slower, so there is no way they're moving faster now. Otherwise it would be a gas now.

So, no, they did not move faster.

D) disappear

Particles of a substance don't just . . . disappear. There is no way matter can be destroyed or created, only changed in form, according to the Conservation of Matter.

So, no, they did not disappear.

So the answer is most likely A.

Answer:

a positive and negative ion

Explanation:

An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.

Answer:

A positive and negative Ion. I took the test!

Explanation:

An ionic bond occurs between what particles?

two negative ions

a positive and negative ion

two neutral atoms

two positive ions

Answer:

Im not sure but I think is D.The solution becomes cloudy with a white solid.

Explanation:

Answer:

the answer is D the solution becomes cloudy with a white solid

Explanation:

Answer:

P2 = 0.95atm

Explanation:

Using Gay Lussac's equation as follows

P1/T1 = P2/T2

Where;

P1 = initial pressure

T1 = initial temperature

P2 = final pressure

T2 = final temperature

According to the information provided in this question; P1 = 1.00atm, T1 = 120°C, P2 = ?, T2 = 100°C

We need to convert temperature in °C to K

T1 (K) = 120°C + 273K = 393K

T2 (K) = 100°C + 273K = 373K

Hence;

P1/T1 = P2/T2

1.00/393 = P2/373

373 × 1 = 393 × P2

373 = 393P2

P2 = 373/393

P2 = 0.949

P2 = 0.95atm

Answer:

Are filled with chlorophyll.

Explanation:

Chlorophyll is found inside plant cells in tiny oval-shaped bodies called chloroplasts.

Answer:

Are filled with chlorophyll.

Explanation:

Answer:

Oxygen, 15.9994

Explanation:

Use the dominant isotope

Answer:

Energy is released by the  reaction

Explanation:

The statement which describes  an exothermic reaction is that energy is released by the reaction.

An exothermic reaction is defined as a chemical reaction which involves release of energy in the form of light,heat .In these reactions, energy is transferred from system to surroundings rather than taking energy from surroundings into system as in endothermic reactions.

In  an exothermic reaction,change in enthalpy is negative.Therefore, it can be inferred that net amount of energy which is required to start the  exothermic reaction is less than the net amount which is released by the reaction.

Examples of exothermic reactions are combustion reactions, detonation of nitroglycerin , neutralization reactions and nuclear fission.

Learn more about exothermic reactions,here:

https://brainly.com/question/10373907

#SPJ2

Answer:

Explanation:

Answer:

amps is how hard it is for the volts to get through hope this helped

Explanation:

Answer:

See attached picture!

Explanation:

You are dealing with salts.  This means that you write the name of the metal (sodium) with the name of the nonmetal (chloride).  You need to change the end of the name of the nonmetal (chlorine to chloride; bromine to bromide).

To find the balanced compound, use the charges of the cations and anions.  You need to write the compounds so that the total charge of the salt is 0.

Answer:When you bring a negatively charged object close to a neutral pith ball, it creates a positive charge (i.e. opposite of negative) on the portion of pith ball nearer the negatively charged object and negative charge on the farthest portion of pith ball.

Explanation:

Answer:

Explanation:

When you bring a negatively charged object close to a neutral pith ball, it creates a positive charge (i.e. opposite of negative) on the portion of pith ball nearer the negatively charged object and negative charge on the farthest portion of pith ball.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.75 \times {10}^{21} }{6.02 \times {10}^{23} } \\ = 0.00622923...[/tex]

We have the final answer as

Hope this helps you

Answer:

6.02 * 10^23

Explanation:

Question:

What organelle is A and B pointing?

Answer:

A = Nucleus

B = Cell Membrane

Explanation:

As we can see A points at the centre of the plant cell. Which is a nucleus. And B points to the outer part of the plant cell. Which is a cell membrane.

Hopefully this answer will help you.

Answer:

Atoms

Explanation:

Answer: The answer is atoms! Have a great day!

A=20

B=40

C=Ca

D=10

E=9

F=F

The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.

So atomic number = number of protons = number of electrons

Mass Number (A) is the sum of protons and neutrons

Mass Number (A) = Number of protons + Number of Neutrons

So that the relationship between atomic numbers and mass numbers can be formulated as follows:

Atomic Number (Z) = Mass Number (A) - Number of Neutrons

A=atomic number=number of protons=20

B=mass number=protons+neutrons=20+20=40

C=the element with atomic number 20 and mass number 40 is Ca,

[tex]\tt _{20}^{40}Ca[/tex]

D=number of neutrons=mass number-number of protons =19-9=10

E=atomic number=number of protons=9

F=the element with atomic number 9 and mass number 19 is F

[tex]\tt _9^{19}F[/tex]

Answer:

We can separate iron from a mixture of sand and iron, as only the iron is attracted to the magnet.

Explanation:

Answer:

What are the answer choices

Explanation:

Answer: helium is a lighter (less dense) gas allowing the balloon to rise high

I hope this helped!

Answer:

helium is less dence then air

Hoped this helps! have a great day lovee

The ona that makes more sense is the first one

Answer:

Slate

Explanation:

Answer:

D. Slate

Explanation:

Had the quiz, got it right

Answer:

Hydrogen?

Explanation:

I'm probably wrong but I hope it helps

Answer:hydrogen

Explanation:

Answer:Direction? tell me if im wrong!

Explanation:

Answer:

its fluid and rubber

Explanation:

fluid and subber made a solid.

Answer:

B

Explanation:

i just take the test

An ionic bond has a high melting point because a lot of energy is required to overcome the attractive forces that hold the ionic crystal together. The correct option is B.

In an ionic bond, atoms transfer electrons to form positively charged cations and negatively charged anions. These oppositely charged ions are attracted to each other, creating strong electrostatic forces between them.

When a solid ionic compound is heated, the thermal energy increases, causing the ions to vibrate more vigorously. As the temperature continues to rise, the ions gain enough energy to break free from their fixed positions within the crystal lattice. This requires a lot of energy because the attractive forces between the ions are strong and must be overcome.

Thus, the correct option is B.

Learn more about ionic bond,here:

https://brainly.com/question/9075398

#SPJ6

Answer:

C?

Explanation:

Answer:

How to balance the oxygen atoms.

Add a coefficient of 5 to the oxygen molecule on the left side of the equation. You now have 10 oxygen atoms on each side.

C3H8 + 5O2 --> 4H2O + 3CO2.

The carbon, hydrogen, and oxygen atoms are balanced. Your equation is complete.