Describe how activity within the earth results in earthquakes

Answers

Answer 1

Answer: plate tectonics within the earth are constantly shifting, and every once in a while the plates collide with one another, causing earthquakes.

Answer 2

Answer: this is geology not chem! plate tectonics are giant masses of land that are constantly shifting. every plate meets with other adjacent plate tectonics. where they meet, a variety of things can happen, sometimes resulting in earthquakes depending on how the plates interact

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When two intermediate chemical equations are combined, the same substance that appears in the same phase can be canceled out, provided thatA) it is a reactant in one intermediate reaction and a catalyst in the other reaction. B) it is a product in one intermediate reaction and a catalyst in the other reaction. C) it is a reactant in one intermediate reaction and a product in the other reaction. D) it is a reactant in both of the intermediate reactions.

If 21.3 grams of lithium react with excess water, how many liters of hydrogen gas can be produced at 297 Kelvin and 1.40 atmospheres? Show all of the work used to solve this problem. 2Li (s) + 2H2O (l) yields 2LiOH (aq) + H2 (g

Answers

Hope it helped you.

What is the molarity of a solution that is made by adding 57.3 g of MgO to 500.0 mL of solutions

Answers

Answer:

The answer to your question is 2.84 M

Explanation:

Data

mass of MgO = 57.3 g

volume of the solution = 500 ml

Process

1.- Calculate the molar mass of MgO

MgO = 24.3 + 16 = 40.3 g

2.- Calculate the moles of MgO

40.3 g MgO ----------------- 1 mol

57.3 g MgO ----------------- x

x = (57.3 x 1) / 40.3

x = 1.42 moles

3.- Calculate the Molarity

Molarity = moles / volume (l)

Volume = 0.5 liters

-Substitution

Molarity = 1.42 / 0.5

-Result

Molarity = 2.84

Final answer:

The molarity of the solution is 2.84 M.

Explanation:

To find the molarity of the solution, we need to first calculate the number of moles of MgO and the volume of the solution.

First, we convert the mass of MgO to moles using its molar mass. The molar mass of MgO is 40.31 g/mol, so:

moles of MgO = mass of MgO / molar mass of MgO

moles of MgO = 57.3 g / 40.31 g/mol = 1.42 mol

Next, we convert the volume of the solution to liters:

volume of solution = 500.0 mL / 1000 mL/L = 0.500 L

Finally, we divide the number of moles of MgO by the volume of the solution to find the molarity:

molarity = moles of solute / volume of solution

molarity = 1.42 mol / 0.500 L = 2.84 M

Learn more about Molarity here:

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Consider the following generic chemical equation:A + B → C + D

Reactant A contains 85.1 J of chemical energy. Reactant B contains 87.9 J of chemical energy. Product C contains 38.7 J of chemical energy. If the reaction absorbs 104.3 J of chemical energy as it proceeds, how much chemical energy must product D contain? Explain your answer.

Answers

Answer: 238.6 J

Explanation:

According to the law of conservation of energy, energy can neither be created nor be destroyed. It can only be transformed from one form to another.

Endothermic reactions are those in which heat is absorbed by the system and thus the energy of products is higher than the energy of reactants.

For the given reaction:

$A+B+energy\rightarrow C+D$

Energy of A = 85.1 J

Energy of B = 87.9 J

Energy on reactant side = Energy of A + Energy of B + Energy absorbed 85.1 + 87.9 + 104.3 = 277.3 J

Energy on reactant side = Energy on product side = 277.3 J

Energy on product side = Energy of C + Energy of D

277.3 J = 38.7 J + Energy of D

Energy of D = 238.6 J

Thus chemical energy product D must contain is 238.6 J

The law of conservation of energy states that energy is not created or destroyed during chemical reactions. The total amount of energy in the reactants, plus the energy absorbed during the reaction, must be equal to the total energy of the products.

Product D contains (85.1 J + 87.9 J + 104.3 J) – 38.7 J = 238.6 J of chemical energy.

If 6.49 mol of ethane (C2H6) undergo combustion according to the unbalanced equationC2H6 + O2 −→ CO2 + H2O ,
how many moles of O2 is required?
1. 27.79
2. 7.63
3. 8.4
4. 25.48
5. 12.635
6. 21.035
7. 23.8
8. 19.04
9. 22.715
10. 26.775
Answer in units of mol.

Answers

Answer:

22.715 moles of oxygen are used

Explanation:

Given data:

Number of moles of ethane = 6.49 mol

Number of moles of O₂ required = ?

Solution:

Chemical equation:

2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

Now we will compare the moles of oxygen with ethane.

C₂H₆ : O₂

2 : 7

6.49 : 7/2×6.49 = 22.715 mol

Thus, 22.715 moles of oxygen are used.

The elements in Period 5 on the Periodic Table are arranged from left to right in order of(1) decreasing atomic mass(2) decreasing atomic number(3) increasing atomic mass(4) increasing atomic number

Answers

Answer: Option (4) is the correct answer.

Explanation:

Atomic mass of an atom or element means the total number of protons and total number of neutrons present.

Whereas atomic number means the total number of protons present in an atom or element.

In period 5 on the Periodic Table, elements from left to right are arranged in order of increasing atomic number.

On the other hand, the atomic mass is not increasing from left to right.

Going from left to right, they are ordered by increase in atomic number

Which unit is used to express the pressure of a gas?

Answers

According to the International System of Units, the unit of pressure is pascal (Pa). However, in calculating, we use atmosphere (atm), which is also a unit of pressure, more often.
Hope this helps~

The unit used to express the pressure of gas is the pascal.

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