When studying seismic records from all over the globe, what did scientists find out about the pattern of earthquakes?A-Many earthquakes are concentrated in narrow zones near earth's poles.

B-Many earthquakes are concentrated in narrow zones at the centers of plates.

C-Many earthquakes are concentrated in narrow zones along plate boundaries.

D-Most earthquakes occur deep under the ocean.

(I was thinking C but i'm not sure...)

Answers

Answer 1

Answer: Its C. Many earthquakes are concentrated in narrow zones along plate boundaries

Answer 2

Answer:

The answer is C-Many earthquakes are concentrated in narrow zones along plate boundaries.

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A sample of gas in a balloon has an initial temperature of 31 ∘C and a volume of 1570 L . If the temperature changes to 90 ∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
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Chromium(III) sulfate is a transition metal compound containing the metal chromium and the polyatomic ion sulfate.The oxidation state of chromium in this compound is
, and the chemical formula of the compound is

Answers

Answer:

a) oxidation number of chromium is +3

b) formula of the compound is Cr2(SO4)3

Explanation:

From the name of the compound, we can see that the oxidation state of chromium is +3

We know the sulphate ion to to be SO4^2-

According to the rules of writing the formula of compounds from valencies, the valency of chromium is 3 while that is the sulphate ion is 2.

The both species can now exchange valency

Cr2(SO4)3------- This is the correct formula of the compound

Answer:

The oxidation state is +3.

chemical formula of compound is Cr₂(SO₄)₃.

Explanation:

Calculation of oxidation state:

Cr₂(SO₄)₃

Cr= ?

The oxidation state of SO₄ = -2

2x + 3( -2) = 0

2x - 6 = 0

2x = 6

x = 6/2

x= 3

The oxidation state of Cr is +3.

The Cr has valency of 3 so three SO₄ will require while the valency of SO₄ is 2 so two Cr will require.

Cr×2 and SO₄×3

Cr₂(SO₄)₃

we know that oxidation state of Cr is +3 so (3×2) = 6

and the oxidation state of SO₄ is -2 so (-2× 3) = -6

6-6= 0

The overall charge is 0, the compound will be neutral.

Sierra did 500 J of work to move her couch. If she exerts 250 N of force on the couch, how far did she move it? (Work: W = Fd) 0.5 m 2 m 250 m 750 m'

Answers

Answer:

The answer is 2 m.

Explanation:

THE Answer IS B 2m

Explanation:

How many grams of chloride ions are in 8.3 g of copper (II) chloride

Answers

$4.4\; {\rm g}$ .

Explanation

Refer to a modern periodic table for relative atomic mass:

Cu- 63.546;
Cl- 35.45.

Formula of copper (II) chloride: CuCl₂.

Formula mass of copper (II) chloride:

63.546 + 2 × 35.45 = $134.446\; {\rm g \cdot mol^(-1)}$ .

How many ${\rm mol}$ of formula units in 8.3 grams of CuCl₂?

$(8.3\; {\rm g}) / (134.446\; {\rm g \cdot mol^(-1)}) \approx 0.0617\; {\rm mol}$

Note the subscript "2" in the formula CuCl₂. There are $2\; {\rm mol}$ of chloride ions in every $1\; {\rm mol}$ formula unit of CuCl₂.

There would be $2 * 0.0617\; {\rm mol} \approx 0.123\; {\rm mol}$ of ${\rm Cl^(-)}$ ions in $0.0617\; {\rm mol}$ formula units of CuCl₂.

The mass of $1\; {\rm mol}$ of chloride ion is 35.45 grams.

The mass of $0.123\; {\rm mol}$ of ${\rm Cl^(-)}$ ions will be $35.45 * 0.123 \approx 4.4\; {\rm g}$ .

Round the final value to two sig. fig. since the mass in the question is also 2 sig. fig.

Ten interesting facts about radium and polonium

Answers

1. They were both discovered by Marie and Pierre Curie.
2. They can both poison you.
3. Radium is named after the Latin word for "Ray"
4. Polonium is named after Poland, the country in which Marie Curie was born.
5. Marie and Pierre Curie obtained radium and polonium from pitchblende, a material containing uranium.
6. Polonium was discovered in 1898.
7. Radium was discovered in 1898 as well.
8. Radium and polonium are both elements on the periodic table.
9. Polonium is also called "radium F".
10. Both radium and polonium must be handled very carefully with good equipment, or their toxic fumes could spread and possibly be fatal.

Hope this helped! :)

What do chemical equations show?

Answers

They show basically the chemical reaction of elements broken down into each element and their quantity, and how the elements bond to form the compound.

Why is the science method important for experiments?

Answers

The scientific method is important for experiments because it allows scientists to have a step by step process while producing an experiment.

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