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AlekseyPX
2 years ago
6

A student added 3 gms one substance in a beaker and then added 4 gms of another substance. A chemical reaction took place in the

uncovered beaker, after the reaction the beaker weighed 5 gms which of the following is the best explanation?
A Some of the mass of the reactants was lost as heat and evaporated into the air.
B. The reaction produce a gas as a product.
C. Some of the reactantants were destroyed as when the chemicals were added.
Chemistry
1 answer:
Alika [10]2 years ago
4 0

Answer:

B. The reaction produce a gas as a product.

Explanation:

According to the law of conservation of mass, the total mass of reactants must be equal to the total mass of products because mass is neither created nor destroyed in a chemical reaction.

The total mass of the reactants is 7 grams. The total mass of the products and the beaker is 5 grams. This means that the mass of products is less than the mass of reactants.

The only plausible explanation for this is that the reaction produced a gaseous product which escaped because the system is an open system thereby leading to a  lesser measured mass of products since mass can not be created nor destroyed.

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What is the most likely charge on an ion formed by an element with a valence electron configuration of ns2np4
Andreas93 [3]

Answer:

2-

Explanation:

For an element to be stable, it must follow the octet rule: an atom will gain, lose or share electrons until its valence shell is complete with 8 electrons.

An element with the valence electron configuration ns²np⁴ has 6 (2+4) electrons in its valence shell. Thus, in order to fulfill the octet, it will gain 2 electrons. As a consequence, it will form an anion with charge 2-.

6 0
3 years ago
A solution has a hydrogen ion concentration of 0.001 M, what is the pH of the solution
LenKa [72]
PH= −log
10
​
[H
+
]
= −log
10
​
(0.001)
= −log
10
​
(10
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10
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01
4 0
3 years ago
Which factors help you identify the solute and the solvent in a solution? Select all that apply. In a solution, the solvent is p
KatRina [158]

The answers would be:

In a solution, the solvent is present in a greater amount.

In a solutions, the solute dissolves in a solvent.

In general, these are the best answers. The solute is what is being dissolved and the solvent is what dissolves. A solvent comes in greater amounts in a solution and it is the dissolving agent.

For example, sugar and water.

To make a sugar water solution, you will need to dissolve sugar in water. Sugar is the solute in this case because it is what is being dissolved. The water is the solvent, because it dissolves the sugar.

If you had more sugar than water, then you cannot make a solution.  

4 0
3 years ago
Read 2 more answers
A. List the potential acute health effects.
AleksandrR [38]

When we handle chemical substances we must be very careful because they can put our:

  • Physical integrity.
  • Health
  • Life at risk.

<h3>What is a chemical?</h3>

A chemical substance is a chemical compound resulting from the union of two or more chemical elements. Compounds have different uses depending on their properties. However, some can be harmful and life-threatening to humans.

<h3>Potential acute effects.</h3>

The potential acute effects of some compounds may be related to skin contact causing:

  • Inflammation
  • Redness
  • Rash
  • Burns
  • Dry
  • Among other.

On the other hand, the chronic effects of chemical compounds can be:

  • Diseases in the central nervous system.
  • Respiratory diseases.
  • Skin diseases.
  • Degenerative diseases of the bone system.

<h3>What to do when a chemical is ingested?</h3>

There are a large number of chemical substances and each one has different properties. Therefore, it is very difficult to generalize about a treatment in case of ingestion. What must be done is to know the level of risk of the substance that is being handled and avoid ingesting it at all costs. However, if it is ingested, go to the emergency room.

<h3>Product flammability</h3>

Not all chemical compounds have the same flammable response to fire. Due to the above, it is necessary to identify if the substance that we are handling is highly or slightly flammable, for this we can consult the manual of the substance or the label of its packaging.

<h3>3 Chemical that produces a potentially dangerous reaction with hydrochloric acid.</h3>

According to some studies and the hydrochloric acid safety data sheet, it can have dangerous reactions with:

  • Reacts violently with water.
  • Gives off hydrogen in reaction with metals.
  • Keep away from strong bases.

<h3>How to handle small spills?</h3>
  • Contain the spill.
  • Soak up with inert absorbent material.
  • Prevent the product from entering the sewage system.
  • Keep in suitable, closed containers for disposal.

<h3>Personal Protection</h3>

When we handle chemical substances we are facing a potential risk. Due to the above, protocols have been developed for its handling, which include the use of protection elements such as:

  • Gloves
  • Glasses
  • Helmet
  • Mask
  • Boots
  • Special suit.
  • Among others.

Learn more about chemical compounds in: brainly.com/question/14498747

5 0
2 years ago
In Rutherford's model of the atom, where are the electrons and protons located?
yan [13]

The answer is A. The electrons orbit the protons, which are at the center of the atom.

3 0
3 years ago
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