CHEMISTRY HIGH SCHOOL

Which of these is a physical property?A) ability to burn a piece of paper

B) pure sodium reacts violently with water

C) the boiling point of water is 100’C

D) helium does not tend to react with anything

Answers

Answer 1
Answer: Hey

I think the answer is c) the boiling point of water is 100’c

I hope this helped xxx

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According to the law of conservation of energy, A) an object loses most of its energy as friction. B) the total amount of energy for a system stays the same. C) the potential energy of an object is always greater than its kinetic energy. D) the kinetic energy of an object is always greater than its potential energy.

Answers

I did research and got B

Answer:

B.

Explanation:

Which organic compound is not only responsible for energy storage, but also can provide thermal insulation? A. lipids B. proteins C. nucleic acids D. carbohydrates E. monosaccharides

Answers

Answer: A. lipids

Explanation:

Lipids are responsible for energy storage. They can also provide thermal insulation in mammals and help them stay warm

This is the metric unit for measuring volume

Answers

Cubic metre is the metric unit for measuring volume. The cubic centimetre has a particular nomenclature called a millilitre.

The 3-dimensional space that is occupied by matter or surrounded by a surface is measured in volume, which is expressed in cubic units. A derived unit called the cubic metre serves as the SI unit of volume.

A unique designation for the cubic decimeter is the litre. To reduce the chance of confusion between the lowercase letter "ell" (l) and the number one (1), the symbol for the litre is an uppercase letter "ell". The litre cannot be represented by the script letter l (l).

To learn more about metric unit , click here.

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Which process takes place when recharging a rechargeable battery?

Answers

Answer:

The correct answer is "Oxidation at the anode and reduction at the cathode".

Explanation:

A rechargeable battery is recharged by the movement of electrons from an external power source into the battery. In order to achieve this, two process take place inside the rechargeable battery: oxidation at the anode and reduction at the cathode. The electrons flow within the battery from the anode to the cathode, this happens by the oxidation of the anode (loss of electrons) and the reduction at the cathode (gain of electrons).
moving of positive charge electron and negative charge proton.

An experiment applies heat to a substance and produces a gas that is a new and different substance. Choose the true statement.A. This represents a physical change only.
B. This represents a chemical change only.
C. This represents both a physical and a chemical change.
D. This represents neither a physical change nor a chemical change.

Answers

I believe it is C; reasoning being that the hint for physical change is," the producing of a gas," chemical "that's new and diff. substance. "

According to atomic theory: a. the nucleus is positively charged.
b. the nucleus contains both charged and uncharged particles.
c. the electrons contribute very little to the total mass of the atom.
d. the electrons are located in the atomic space outside the nucleus.
e. all of these

Answers

Answer:

e. all of these

Explanation:

Let us check all the given options one by one:

a.The nucleus is positively charged.

Yes it is correct since nucleus contain protons and neutrons and protons are positively charged.

b.The nucleus contains both charged and uncharged particles.

Yes because protons are positively charged and neutrons are neutral in nature.

c.The electrons contribute very little to the total mass of the atom.

Yes we know all the mass of the atom is considered in center and mass of electron is negligible as compared to protons and neutrons.

d.The electrons are located in the atomic space outside the nucleus.

Yes, its a known fact.

e. All of these.

Since , all given options are correct .

Therefore , option e. is right .
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