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3 years ago

the particles that make up a rock are constantly moving. however, a rock does not visibly vibrate. why is this?

2 answers:

8 0

It is due to a low entropy level in the rock, and also the type of chemical bonds the rock has.
An example similar to this one would be diamond. It is made up of carbon bonds. But once you take a (real) diamond out of the ground, it very slowly, not visible to the human eye, yet surely is turning back into graphite. (another substance made by carbon bonds)
i hope this helped.

kipiarov [429]3 years ago

5 0

Only the particles inside the rock/solid are moving, not the actual rock.

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Draw the products of benzoic acid reacting with sodium hydroxide.

Katena32 [7]

Answer:

Products: C6H5COO-Na+ (aq) + H2O (l)

Explanation:

when the benzoic acid react with sodium hydroxide, the acid part i.e carboxyl group is react with the base and produce ionic compound sodium benzoate (C6H5COO-Na+).

Chemical equation:

C6H5COOH + NaOH → C6H5COO-Na+ + H2O

Chemical reaction with physical states:

C6H5COOH (s) + NaOH (aq) → C6H5COO-Na+ (aq) + H2O (l)

Sodium benzoate is very polar ionic compound and soluble in water. If we add HCl into this solution sodium benzoate will be converted back into benzoic acid.

Properties of benzoic acid:

1. it is colorless solid.

2. it is crystalline in nature.

3. it is aromatic compound with the formula C7H6O2.

4. it is soluble into benzene, alcohol and ether.

5. its molar mass is 122.12 g/mol.

Properties of sodium benzoate:

1. Sodium benzoate is white odorless chemical compound.

2. It is aromatic compound and molecular formula is C7H5NaO2.

3. Its molecular weight is 144.11 g/mol.

4. it is sweet in taste and soluble in water.

5. it is used as preservative because of its antimicrobial properties.

Properties of Sodium hydroxide:

1. it is colorless solid and inorganic compound.

2. it is crystalline in nature.

3. its molar mass is 40 g/mol.

4. its molecular formula is NaOH.

5. its melting point is 318 °C.

6 0

3 years ago

Different phases of water have different densities. True or false?

Art [367]

Answer: True

Explanation:

Indeed, different phases of water have diffferent densities.

The different phases, solid, liquid, and gas, of water are characterized by the separation of the molecules.

The density is a measure of concentration of the mass of a substance. Mathematically, density is the ratio of the mass to the volume:

density = mass / volume

A high density means a high ratio of mass to volume, and a low density means a low ratio of mass to volume.

The volume is the space occupied by the substance and the space occupied is related to the separation among the particles (atoms, molecules or ions).

Since, each state is characterized by certain separation of the particles, you can conclude that the different phases of water have different densities.

The densities of the gases are low and highly dependent on the temperature and pressure. So, the water vapor is the phase with the lowest densities.

Liquid water in the range of 5°C - 100°C has densities in the range 0.9998°C to 0.9587 g/cm³.

The density of water at 4 °C (liquid phase) is 1.000 g/cm³.

Due to the special interactions of hydrogen bonds, the density of water starts to decrease at temperatures below 4 °C ( 0.9999 g/cm³ - 0.9839 g/cm³), causing the frozen water (ice) to be less dense and float in the water.

5 0

3 years ago

Gustavo receives from his doctor postoperative instructions that must be followed regarding his transabdominal operation. Which

Luden [163]

Answer:

"Gustavo is having an operation in the area across his abdomen and must follow the instructions after the operation is complete."

Explanation:

As shown in the question above, Gustavo underwent a transabdominal operation, ie Gustavo underwent surgery on the abdomen. As the abdomen is a delicate and widely used region of the human body, Gustavo's doctor provided some instructions that Gustavo should follow during the postoperative period that would ensure that he had a good recovery and no further health problems. Based on this, we can conclude that the statement that best explains this scenario is "Gustavo is having an operation on the abdomen area and should follow the instructions after the operation is completed."

6 0

4 years ago

Read 2 more answers

The steps of the Scientific Method include question, hypothesis, experiment,

antiseptic1488 [7]

Answer:

True

Explanation:

Define purpose.

Construct hypothesis.

Test the hypothesis and collect data.

Analyze data.