CHEMISTRY HIGH SCHOOL

Which two properties are used to define matter? A.has mass and conducts heat
B.has buoyancy and volume
C.has mass and takes up space
D.conducts energy and has characteristic properties

Answers

Answer 1
Answer: The two properties which are used to define matter are that it has massand it takes up space. The other properties do not necessarily apply toeach matter. Such some matter can be a conductor of heat (such as metal)and some not (such as non metals). Likewise, some matter can be buoyantand float on liquid of density more than it but others would not on theliquids of density less than it. In-fact not all the matters areconductors of energy (such as heat, sound, electricity) or at-least avery poor conductor of energy and tend to find application asinsulating agents (non conductors). So the only thing which isnecessarily true is that the matter would definitely have mass in eventheir minutest form as atom and would take up some space.

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What is the best description of what Becquerel observed in his experiment?

Answers

He is best known for his discovery of radioactivity, first reported just over a century ago in the selection reproduced here. The discovery of radioactivity thus represents a key development in the modern understanding of the atom. Hope this helps. Have a nice day.

Which sequence represents the relationship between temperature and volume as explained by the kinetic-molecular theory?higher temperature / more kinetic energy / more space between particles / higher volume
higher temperature / less kinetic energy / less space between particles/ higher volume
higher temperature / more kinetic energy / less space between particles / lower volume
higher temperature / less kinetic energy / more space between particles / lower volume

Answers

Answer: higher temperature / more kinetic energy / more space between particles / higher volume.


Explanation:


1) One postulate of the kinetic theory is that the average kinetic energy of gas particles is proportional to the absolute temperature of the gas.


That means that the higher temperature, the higher the kinetic energy of the molecules, which is the start of the sequence of the relationship between temperature and volume.


2) Since average kinetic energy is proportional to the square of the speed, KE = [1/2] mass × (speed)², it follows that at higher the kinetic energy the faster the molecules will move.


3) By moving faster, the particles will collide more frequently so they will move away from each other, occupying more space.


4) More space between the molecules, is more volume.


So, the sequence is complete: higher temperature → higher kinetic energy (higher speed) → more space → more volume.

The answer is: higher temperature/ more kinetic energy/ more space between particles/ higher volume

How to calculate molar mass

Answers

 Molar masses of chemical compounds are equal to the sums of the molar masses of all the atoms in one molecule of that compound. After that, If you have a subscript in a chemical formula, then you multiply the number of atoms of anything next to that subscript by the number of the subscript. I'm kinda new to this stuff. Hopefully I helped :/
Molar mass is the sum of all atomic masses in a given compound in relative grams. To explain how to calculate the Molar mass, let me show you an example.

Calculate the Molar mass of H2O

now, atomic mass of H - 1
Atomic mass of O - 16

Now, molar mass = 1(2) + 16

= 2 +16
= 18 u = 18 grams (relative mass in grams)

Read the sentence below and answer the question that follows.Tommy the Clown or the Hip Hop Clowns travel the world performing for diverse audiences.



How should the sentence above be rewritten to correct the subject-verb agreement error?

A) The sentence is correct as written.
B) Tommy the Clown or the Hip Hop Clowns travels the world performing for diverse audiences.
C) Tommy the Clown or the Hip Hop Clowns was travelling the world performing for diverse audiences.
D) Tommy the Clown and the Hip Hop Clowns travels the world performing for diverse audiences.

Answers

Correct sentence should be B. Tommy the Clown or the Hip Hop Clowns travels the world performing for diverse audiences. If there is a single subject then the verb should be plural, that is, it should be travels as oppose to travel.

Answer:

Answer is A) The sentence is correct as written

Explanation:

How are mixtures compounds and elements alike?

Answers

elements make up compounds, and when 2 or more compounds are chemically combined it makes a mixture or they are all matter, they have mass and occupy space 

Given the balanced ionic equation:Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
Which equation represents the oxidation half reaction?
(1) Zn(s) + 2e– → Zn2+(aq)
(2) Zn(s) → Zn2+(aq) + 2e–
(3) Cu2+(aq) → Cu(s) + 2e–
(4) Cu2+(aq) + 2e– → Cu(s)

Answers

Answer: Option (2) is the correct answer.

Explanation:

Oxidation is the process in which there is loss of electrons or increase in oxidation number of the element.

Whereas reduction is the process in which there is gain of electrons or decrease in oxidation number of the element.

For example, Zn(s) + Cu^(2+) \rightarrow Zn^(2+) + Cu(s)

Oxidation-half reaction: Zn(s) \rightarrow Zn^(2+) + 2e^(-)

Reduction-half reaction: Cu^(2+) + 2e^(-) \rightarrow Cu(s)

Thus, we can conclude that the given equation Zn(s) → Zn2+(aq) + 2e– represents the oxidation half reaction.

The equation that represents the oxidation half reaction is Zn(s) → Zn2+(aq) + 2e–

What is oxidation reaction?

Oxidation reaction is the process in which there is loss of electrons or increase in oxidation number of the element.

From all the given half reaction, there is only one reaction with increase in oxidation number;

Zn(s) → Zn2+(aq) + 2e–

  • Zn(s) - oxidation = 0
  • Zn2+ - oxidation number = +2

Thus, there is increase in oxidation number of 0 to + 2.

Learn more about oxidation number here: brainly.com/question/27239694

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