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kirza4 [7]
2 years ago
7

HDSJDHAJ SOMEONE HELP ME IM ABOUT TO FAIL MY SCIENCE CLASS

Chemistry
2 answers:
Harlamova29_29 [7]2 years ago
5 0
A radiation
B is convetion
Tema [17]2 years ago
3 0

Answer:

Method A is radiation and Method B is convection.

Explanation:

hope this helps!

Pls mark as brainliest :)

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8. Which of the following are reasons why Index fossils are chosen for determining ages of rocks? Select all that apply .
igomit [66]

Answer:

B. Distributed over a very wide range

D. Limited life existence in geologic time.

Explanation:

Index fossils are very unique fossils that helps in determining the relative ages of rocks and biostratigraphic correlation. They are usually called guide fossils.

  • Fossils are the preserved remains of dead organisms found in rocks.
  • Index fossils are a special class of fossils with the following properties;
  1. They are widely distributed.
  2. They have a short stratigraphic range.
  3. They show rapid evolution trends
4 0
3 years ago
Read 2 more answers
Consider the reaction 4PH3(g) → P4(g) + 6H2(g) At a particular point during the reaction, molecular hydrogen is being formed at
Svetllana [295]

Answer:

The rate at which P_4 is being produced is 0.0228 M/s.

The rate at which PH_3 is being consumed is 0.0912 M/s.

Explanation:

4PH_3\rightarrow P_4(g)+6H_2(g)

Rate of the reaction : R

R=\frac{-1}{4}\frac{d[PH_3]}{dt}=\frac{1}{6}\frac{d[H_2]}{dt}=\frac{1}{1}\frac{d[P_4]}{dt}

The rate at which hydrogen is being formed = \frac{d[H_2]}{dt}=0.137 M/s

R=\frac{1}{6}\frac{d[H_2]}{dt}

R=\frac{1}{6}\times 0.137 M/s=0.0228 M/s

The rate at which P_4 is being produced:

R=\frac{1}{1}\frac{d[P_4]}{dt}

0.0228 M/s=\frac{1}{1}\frac{d[P_4]}{dt}

The rate at which PH_3 is being consumed :

R=\frac{-1}{4}\frac{d[PH_3]}{dt}

0.0228 M/s\times 4=\frac{-1}{1}\frac{d[PH_3]}{dt}

\frac{-1}{1}\frac{d[PH_3]}{dt}=0.912 M/s

6 0
3 years ago
A base _____. A.accepts hydrogen ions, B.releases hydrogen ions, C.accepts hydrogen atoms
xxMikexx [17]
<span>C.accepts hydrogen atoms
i think
</span>
5 0
3 years ago
Read 2 more answers
(a) What is the charge density of an ion, and what two properties of an ion affect it?
olga nikolaevna [1]

Charge density is the ratio of the charge of ions to the volume of ions.

<h3> Factor affecting charge density</h3>

It depends on the following properties of ion as

  • Charge on the ion.
  • Volume of the ions.

The lithium ion, Li⁺, has half of the radius of the potassium ion, K⁺. That is why, Li⁺ have a electric field 4 times stronger than the electric field of K⁺ and thus it have 4 times stronger force of attraction.

All the ions: Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺, have the similar electric charge +1.6×10⁻¹⁹ C. As we know that, volume is directly proportional to the third power of their radius. Therefore, smaller ions have less charge density than bigger one.

We can say that charge density decreases down across period due to decrease in the radius which further reduces the volume of ions.

Charge density increases along group due to increase in the radius which further increases the volume of ions.

Thus, we can say that charge density depends on the charge and volume of the ions.

learn more about charge density:

brainly.com/question/15810178

#SPJ4

6 0
1 year ago
Which of the following descriptions of the electron dot structure corresponds to an element in the s block?
kramer

Answer:

Option (3) is the correct answer.

Explanation:

3 0
3 years ago
Read 2 more answers
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