CHEMISTRY HIGH SCHOOL

Freezing requiresa. the removal of energy.
b. the absorption of energy.
c. no energy change.

Answers

Answer 1
Answer:

Answer:

The correct answer is option a. the removal of energy.

Explanation:

Hello!

Let's solve this!

Freezing is a process by which a lot of heat is lost, this loss of heat leads to a loss of energy as well. It means that energy is eliminated so that heat loss occurs.

Therefore the correct answer is option a. the removal of energy.

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At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products? a) The product is doubled. b) The product is half the mass of the reactants. c) The mass is the same. d) The mass changes depending on the reaction.

Answers

Answer:

c) The mass is the same

Explanation:

According to the Law of Conservation of Mass, the total mass of the reactants in a chemical reaction is always equal to the total mass of the products formed. This means that the total mass of the reactants and the total mass of the products will always be the same.

What is the volume of 2.1 moles of chlorine gas (Cl2) at standard temperature and pressure (STP)?

Answers

Given:
 2.1 moles of chlorine gas (Cl2) at standard temperature and pressure (STP)
Required:
volume of CL2
Solution:
Use the ideal gas law
PV = nRT
V = nRT/P
V = (2.1 moles Cl2) (0.08203 L - atm / mol - K) (273K) / (1 atm)
V = 47 L

Fluorine, chlorine, bromine, and iodine are part of a family called what?

Answers

The correct answer is "halogens." Fluorine, chlorine, bromine, and iodine are part of a family called halogens. In the periodic table, it is the column that is beside, left of the noble gases. The name 'halogen' means 'salt-producing'.

The fabrication method that joins together materials, usually metal, is known as __________.a. casting
c. cutting
b. milling
d. welding

Answers

The correct answer is (d.) welding. Welding is a fabrication method that joins together materials, usually metal. by causing fusion. This method melts the materials upon joining it together  for a specific temperature without melting the base metal.

Answer:

d. welding is the correct answer.

Explanation:

  • The fabrication method that joins together materials, usually metal, is known as welding.
  • Welding is a process by which materials are joined by melting their parts.
  • In the welding process metals parts are joined by using heat.
  • The heat is supplied with the help of a gas flame or by an arc that melts the metal parts and enabling them to cool producing fusion.
  • Welding is used joints the dissimilar metals and thin metals, sheets.

Which calculation set-up would be correct to determine the volume of concentrated hydrochloric acid (12.0 M HCl) that is required to make 500.0 milliliters of a 6.0 M HCl?

Answers

Answer : The volume of concentrated hydrochloric acid is, 0.25 liters

Explanation :

Using neutralization law,

M_1V_1=M_2V_2

where,

M_1 = molarity of concentrated hydrochloric acid = 12 M = 12 mole/L

M_2 = molarity of hydrochloric acid = 6 M = 6 mole/L

V_1 = volume of concentrated hydrochloric acid = ?

V_2 = volume of hydrochloric acid = 500 ml = 0.5 L

Now put all the given values in the above formula, we get the volume of concentrated hydrochloric acid.

12mole/L* V_2=6mole/L* 0.5L

V_2=0.25L

Therefore, the volume of concentrated hydrochloric acid is, 0.25 liters
M₁ *V₁ = M₂ * V₂

12.0 * V₁ = 6.0 * 500.0

12.0 V₁ = 3000

V₁ = 3000 / 12.0

V₁ = 250 mL

hope this helps!

What are some factors that might cause our percent yield to be greater than 100%? What are some factors that might cause it to be less than 100%? Make sure you discuss specific cases of how both might happen.

Answers

In the field of science, usually, the product of an experiment iscomputed ahead to understand if it reached a specific objective. It would reachgreater than 100% of percent yield if the factors include faster reaction rates;proper handling of the reactants, no outside contaminants, and the procedure ofthe experiment is followed smoothly. It would reach lesser than 100% percent yieldif the experiment is not followed, external factors such as contamination fromthe environment (wind, moisture, etc). 
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