CHEMISTRY HIGH SCHOOL

A student had two dilute, colorless solutions, HCl(aq) and NaOH(aq), which were at the same temperature. The student combined the solutions, and the reaction represented above occurred. Which of the following results would be evidence that a chemical reaction took place

Answers

Answer 1
Answer:

Answer:

The reaction of an aqueous hydrochloric acid solution with an aqueous sodium hydroxide solution is represented by the neutralization chemical equation:

HCl(aq) + NaOH(aq) --> NaCl(aq) + H2O(l) + Energy

Explanation:

This is called a neutralization reaction, which is a reaction in which an acid and a base react to form water and a salt. This reaction involves the combination of H+ ions and OH- ions to generate water. pH equal to 7 is a neutralization of a strong acid and strong base. The neutralization of a strong acid and weak base will have a pH of less than 7, and conversely, the resulting pH when a strong base neutralizes a weak acid will be greater than 7.

When a solution is neutralized, it means that salts are formed from equal weights of acid and base. The amount of acid needed is the amount that would give one mole of protons (H+) and the amount of base needed is the amount that would give one mole of (OH-).

Answer 2
Answer:

The production of sodium chloride and water is the indication that reaction took place.

  • The formation of sodium chloride and water would be evidence that a chemical reaction took place because new substances are formed from the reaction hydrochloric acid (HCl) and sodium hydroxide (NaOH).
  • When  hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), the sodium of NaOH combine with chlorine of HCl produces sodium chloride (NaCl).
  • Whereas the hydrogen of HCl combine with hydroxide of NaOH so we can conclude that production of sodium chloride and water is the indication that reaction took place.

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What is the mass of 2.65 millimoles of sulfur?

Answers

Divide this problem in to two steps: 1. Convert millimoles to moles. 2. Convert moles to grams.

1.
2.65 mlmol x 1mol/1000mlmol=.00265mol

2.
.00265mol x 32.065g/1 mol=.0850g S

Let me know if you need more explanation on why I used the conversions that I did.

I need help with energy

Answers

Answer:

Explanation:

The correct answer is

energy resulting from the flow of charged particles , such as electrons or ions.

hope it helps :)

Which crime has the highest association with alcohol use?robbery

manslaughter

murder

assult

Answers


An article I just read said and I quote " a significant proportion of offenders and victims of sexual assault have consumed alcohol and alcohol increases the risk of sexual assualt, as victims become less able to detect dangerous situations. SO I would say the answer to you problem would be assault is sexual assualt is included in the answer.

Answer:

assault

Explanassaultation:

As ice transforms into steam, A)new molecules are formed. B)the types of atoms are changed. C)energy is absorbed by the molecules. D)the mass of the molecules is increased.

Answers

This is an example of a substance changing state, a physical change, the molecules are changed, but the atoms themselves do not change, just their arrangement, and the mass of the molecules is the same. Therefor energy is absorbed by the molecules, as energy is required to change the state or physicality of a molecule structure.Hope this helps. Let me know if you need additional help!

The answer is C) energy is absorbed by the molecules.

A scientist thinks that ducks swim faster when they are in cold water. He tests two groups of ducks, one in cold water and one in room temperature water. He records how fast they swim.Experimental Group:


Control Group:

Answers

Experimental group is the ducks in cold water
And the control group is the ducks in room temperature water

Final answer:

In the experiment, the Experimental Group represents ducks in cold water, while the Control Group represents ducks in room temperature water. The scientist is testing whether water temperature affects duck swimming speed.

Explanation:

In the experiment described, the scientist is exploring whether the temperature of the water affects the speed of swimming of ducks. The Experimental Group in this scenario represents the ducks that are swimming in cold water. The scientist expects that these ducks will swim faster, based on the original hypothesis. On the other hand, the Control Group represents the ducks that are swimming in room temperature water. This group serves a basis for comparison to help the scientist determine what changes (if any) occur when the variable (water temperature) is altered.

Learn more about Scientific Experiment here:

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What are  human made of

Answers

Dust, Water, Ogyen, Nitrogen. 
A living person is made up of the following bodies.The gross bodyThe vital body The mental body The intellect  or causal body The subtle ego or supracausal bodyThe soul or the God Principle in each of us
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