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lesantik [10]
3 years ago
7

In which time period were the first animals that could live both water and land

Chemistry
1 answer:
djverab [1.8K]3 years ago
7 0
The evolution of tetrapods began about 400 million years ago in the Devonian Period with the earliest tetrapods evolved from lobe-finned fishes.
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You look for shells when you visit the beach. However, if you're hiking in the mountains and you find shells by accident, you kn
Lubov Fominskaja [6]

Answer:ThE aNsWeR iS B

Explanation: The earth was one a big ocean but than volcanoes explode and that created land :)

6 0
3 years ago
Read 2 more answers
What is the silver ion concentration in a solution prepared by mixing 369 mL 0.373 M silver nitrate with 411 mL 0.401 M sodium c
LuckyWell [14K]

Answer:

[A g + ]  =  3.12 *10^-6 M

Explanation:

Step 1: Data given

Volume silver nitrate = 369 mL

Molarity silver nitrate = 0.373 M

Volume sodium chromate = 411 mL

Molarity sodium chromate = 0.401 M

The Ksp of silver chromate is 1.2 * 10^− 12

Step 2: The balanced equation

2 A g + ( a q )  +  C rO4^2-  ( a q )  →Ag2CrO4 (  s)

Step 3:

[Ag+]i = [AgNO3] * V1/(V1+V2) * 1 mol Ag+ / 1 mol AgNO3

[Ag+]i = 0.373 M * 0.369/ (0.369+0.411)

[Ag+]i = 0.176 M

[C rO4^2]i = [Ag2CrO4] * V2 /(V1+V2) * 1mol C rO4^2 / 1 mol Ag2CrO4

[C rO4^2i = 0.401 M * 0.411 / (0.369+0.411)

[C rO4^2]i = 0.211 M

Ksp = [Ag+]²[CrO4^2-] = 1.2 * 10^− 12

[CrO4^2-]f = [CrO4^2-]i - 0.5 * [Ag+]i

[CrO4^2-]f = 0.211 -0.088 = 0.123 M

1.2 * 10^− 12  = ( 2 x ) ²*( 0.123M + x )

[ C O 3^ −2] f  >>  x

1.2 * 10^− 12  = ( 2 x ) ²* 0.123M

x = 1.56 * 10^-6

[A g + ] f  = 2x = 3.12 *10^-6 M

,

4 0
3 years ago
How much energy is involved to cool 16.2 g of steam at 115.0°C to -2.00°C?
love history [14]

Explanation:

think its specific heat of water = 4.18 J/g°Ci

6 0
3 years ago
1. There is no formation of volcanoes in the convergence between
tester [92]

A volcano is caused by a rupture in the crust from which molten magma

escapes

The correct options are;

  1. B. Two continental plates
  2. C. Volcanoes
  3. C. A tsunami in the ocean
  4. C. The temperature in the mantle is higher than in the crust
  5. A. Volcanic island arcs
  6. A. Earthquake
  7. B. Trench
  8. C. Subduction
  9. A. Fault
  10. C Tsunami
  11. A. Convergent plate boundary
  12. See attached drawing (<em>Based on Department of Education Science Module)</em>
  13. D. a, b and c
  14. C. Converging oceanic plates
  15. It is where the oceanic plates subduct under the continental plate

Reasons:

1. Due to the equal densities and buoyancy of the plates, there is no

subduction and the plates rise to form mountain ranges and no volcanoes.

2. The subduction causes the plates to form magma and then volcanoes.

3. Shallow earthquakes that have their epicenter at the fault line in the

ocean generate a tsunami.

4. The mantle lay under each plate and therefore, the high temperatures

of the mantle does not support the fact.

5. Volcanic arcs are formed in the convergence of two oceanic or oceanic

and continental plates.

6. When two continental plates converge, shallow earthquakes occur.

7. A crack called a trench is formed by the interaction of an oceanic crust

and another crust.

8. A subduction occurs when oceanic plates converge.

9. A fault is produced by horizontal plate movement.

10. A Flip or kick upwards of water is known as a tsunami.

11. Subduction occurs during convergence of two plates such that a

subducted plate goes down beneath an overriding plate.

12. The illustration of seafloor spreading consists of two plates moving

away from each other.

<em>Question 12: Based on Department of Education Science Module</em>.

<em />

13. Earthquake occur at places where the plates are moving (including

subducting).

14. Volcanic island arcs are formed by two oceanic plates.

15. At the location where the continents meet the seas, oceanic plates are

subducted under the continental plate, melted to magma in the mantle

from which volcano is formed.

Learn more about volcanoes here:

brainly.com/question/19424796

5 0
3 years ago
How many moles are in 9.8 grams of calcium?
Alexxx [7]
The answer is 0.24 moles.
8 0
3 years ago
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