Which change in oxidation number indicates oxidation?(1) –1 to +2 (3) +2 to –3
(2) –1 to –2 (4) +3 to +2

Answers

Answer 1

Answer:

The change that shows an oxidation is the change –1 to +2.

What is oxidation?

The term oxidation has to do with an increase in oxidation number. This increase will always be positive.

Hence, we have to look out for the change in which there is an increase in oxidation number and this occurs for the change –1 to +2.

Learn more about oxidation:brainly.com/question/13110055?

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Answer 2

Answer: Oxidation is the loss of electrons (OILRIG, oxidation is loss, reduction is gain), so that would mean a gain in charge (Well from negative to positive). The only one to show charge going up is (1)

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a pro golfer hits 45.0-gram golf ball, giving its speed of 75.0 m/s. what is the momenntum has the golfer given to the ball

Answers

Momentum = mass x velocity. 45g = 0.045kg. 0.045 x 75 = 3.375 kgm/s

What is the total number of protons contained in the nucleus of a carbon 14 atom

Answers

A carbon 14 atom would have two more neutrons than a carbon 12 atom but they would both still have 6 protons

The movement of organisms into a range is called A. immigration.
B. emigration.
C. population shift.
D. carrying capacity.

Answers

The answer is A. Immigration

18. Which of the following reactions are endothermic or exothermic? Explain your answers. A. When a certain amount of potassium nitrate is dissolved in water, the water temperature drops from 23°C to 18°C. B. Jack cooks himself a steak. C. When cold water is mixed with sulphuric acid, the mixture can rapidly reach the boiling point of water. D. A flare burns up slowly.

Answers

Answer:

The answer to your question is below

Explanation:

An endothermic reaction absorbs heat to proceed.

An exothermic reaction releases heat to proceed.

A. When a certain amount of potassium nitrate is dissolved in water, the water temperature drops from 23°C to 18°C. This is an example of an endothermic reaction because of the temperature diminishes.

B. Jack cooks himself a steak. This is an endothermic reaction because the steak does not cook itself it needs heat to be cooked.

C. When cold water is mixed with sulphuric acid, the mixture can rapidly reach the boiling point of water. This is an exothermic reaction because the temperature of water increases, which means that energy is been released.

D. A flare burns up slowly. I think it is an endothermic reaction because it was supply energy to proceed.

How does the human eye see objects?A.
Light absorbed by objects, enters the eyes, and is refracted by the optic nerve in the retina.

B.
Light reflects off objects, enters the eyes, and is detected by the optic nerve in the retina.

C.
Light refracts off objects, enters the eyes, and is captured as a photograph by the lenses.

D.
Light reflects off objects, enters the eyes, and is detected by light-sensitive cells in the retina.

Answers

The human eye see objects through light reflects off objects, enters the eyes, and is detected by the optic nerve in the retina. The answer is letter B. The rest of the choices do not answer the question above.

Reaction rate is the speed with which reactants are converted to products in a chemical reaction. True or False?

Answers

True. Except that it is per unit of time. Units are important in order for our chemical reactions speed to be determined properly.

Final answer:

The statement is true; reaction rate in chemistry refers to the speed at which reactants are transformed into products. Its rate is influenced by factors like concentration, temperature, and the presence of catalysts.

Explanation:

"Reaction rate is the speed with which reactants are converted to products in a chemical reaction," as stated above, is correct. In chemistry, the term Reaction Rate is used to describe how rapidly or slowly changes occur in a chemical reaction. It essentially provides information about how quickly reactants are transformed into products. Factors such as concentration, temperature, and presence of catalysts can influence the rate of a reaction.