CHEMISTRY HIGH SCHOOL

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?

Answers

Answer 1
Answer: Hope it cleared your doubt :)

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Water is called the “universal solvent.” Which statement best explains this description with respect to ionic compounds?

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Answer is: C. Water can dissociate many ionic compounds through ion-dipole interactions.

For example, dissociation of potassium bromide: KBr(aq) → K⁺(aq) + Br⁻(aq).

Some ionic compounds cannot dissociate in water, for example calcium sulfate (CaSO₄), silver chloride (AgCl), lead(II)-carbonate (PbCO₃).

An ion-dipole is electrostatic interaction between a charged ion (cations and anions) and a molecule that has a dipole (in this example water).

Dipole is a separation of positive and negative charges. In water, hydrogen has positive and oxygen has negative charge.
It is called the universal solvent because it can dissolve a wide range of solutes. Generally speaking, water is good at dissolving ions and polar molecules, but poor at dissolving nonpolar molecules. Water molecules are polar, with partial positive charges on the hydrogens, a partial negative charge on the oxygen, and a bent overall structure. The unequal charge distribution in a water molecule allows the interaction with ions.

What body system does the Arterial wall and the Fatty deposit belong to

Answers

Answer:

The wall of the arteries belongs to the circulatory system.  The fat deposit belongs to the adipose connective tissue.

Explanation:

The arterial system is the high pressure portion of the circulatory system. Blood pressure ranges from the maximum pressure during cardiac contraction, called systolic pressure, to the minimum pressure, or diastolic pressure, between contractions when the heart rests between cycles. This variation in pressure in the arteries produces a pulse that is observable in any artery, and is an indicator of cardiac activity. The wall of the arteries is thick, formed of elastic muscle tissue.

Adipose tissue is a type of connective tissue with special properties. It has many adipocytes, specialized cells, which have the main function of energy reserve, through a fat deposit, for the body, among others. Fat is deposited in fat cells also called adipocytes.

Final answer:

The arterial wall and fatty deposit belong to the cardiovascular system.

Explanation:

The arterial wall and the fatty deposit belong to the cardiovascular system in the human body.

Learn more about Cardiovascular System here:

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An atom of lithium 7 has an equal number of

Answers

Electrons and protons
Lithium 7 has an equal number of protons and neutrons. 

The rising of cold water from deeper layers to replace warmer surface is calledA. Coriolus effect
B. Surface current
C. Upwelling
D. Reflection

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Upwelling is the answer

The function of hydrochloric acid in the gastric juice.

Answers

the function of hydrochloric acid is to melt the food

1) 0.143 g Mg into atoms
2) 0.101 kg Ti into atoms

Answers

Answer:

The answer to your question is below

Explanation:

1) 0.143g of Mg into atoms

- Look for the atomic number of Magnesium in the Periodic table              

Atomic number = 24.31 g

-Use the Avogadro's number to find the number of atoms

                          24.31g ------------------- 6.023 x 10²³ atoms

                           0.143 g -----------------  x

                           x = (0.143 x 6.023 x 10²³) / 24.31

                           x = 8.613 x 10²² / 24.31

                           x = 3.54 x 10²¹ atoms

2) 0.101 kg of Ti into atoms

-Look for the atomic number of Titanium in the Periodic table

Atomic number = 47.87 g

-Use the Avogadro's number to find the number of atoms

                      47.87 g --------------------- 6.023 x 10²³

                      101 g    ----------------------  x

                       x = (101 x 6.023 x 10²³) / 47.87

                       x = 6.08x 10²⁵ / 47.87

                      x = 1.27 x 10²⁴ atoms                            
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