CHEMISTRY HIGH SCHOOL

What is the process that changes one set of chemicals into another set of chemicals?A. cohesion
B. hydrogen bonding
C. chemical reaction
D. dissolving

Answers

Answer 1

Answer: C. chemical reaction

A chemical reaction changes the reactants into the products but still conserves the mass.

Answer 2

Answer:

C) Chemical reaction!

Hope this helps!

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What is the name of the movement of the Earth around the Sun as pointed out by letter J.

Answers

it is called the Earth's rotation

A solution is made by dissolving 10.20 grams of glucose (C6H12O6) in 355 grams of water. What is the freezing-point depression of the solvent if the freezing point constant is -1.86 °C/m? Show all of the work needed to solve this problem.

Answers

The freezing point constant means that the temperature depression when adding one mole of the solute. The mole number of the solute is 10.20/180=0.0567 mol. So the answer is 1.86*0.0567=0.105 ℃.

10.20 g C6H12O6 x (1 mole C6H12O6 / 180 g C6H12O6) = 0.0567 mole C6H12O6

Then convert grams of water to kilograms of water by dividing by 1000.

355 g / 1000 = .355 Kg of H2O

molality (m) = (0.0567 mole C6H12O6 / .355 Kg of H2O) = 0.160 m

Then plug it in to the formula Δtf = Kfm

Δtf = (-1.86 °C/m) x (0.160 m)

Δtf = -0.298 °C

Group 1a elements have _________ electron(s) in their valence shell. a. 1
b. 2
c. 4
d. 8

Answers

Answer:

a. 1

Explanation:

As you know the group 1A elements are also called the Alkali metals and are highly reactive metals because they have only one electron in their valence shell, this means that all prior levels are full and stable, and they have only one electron in the upper level of the valence shell and it is ready to react with any element that is close to it.

a. 1

The number of valance electrons an element has is determined based on the group they are in.

The law of conservation of energy states that when one form of energy is converted into another,a. energy is destroyed in the process.
b. no energy is destroyed in the process.
c. energy is created in the process.
d. some amount of energy cannot be accounted for.

Answers

Energy of a system is conserved always but it can be converted to other forms . By this conversion no energy is destroying or creating. Thus, option b is correct.

What law of conservation of energy?

According to the law of conservation of energy, energy can neither be created nor be destroyed. However, it can be transformed into other forms. For instance, in light bulb, electrical energy is converting to light energy and heat energy.

Similarly, in fan and motors, electrical energy is converting to mechanical energy and in thermal power plants, thermal energy is converting to electrical energy.

In all of these cases, no amount of energy is destroying or creating. The already existing energy is transforming to various other forms.

Similarly when tow objects in contact exchange energy by mixing or any force, the energy lost from a system will be equal to the energy gained by the second system. Therefore, the total energy is conserved.

To find more on energy transformation, refer here:

brainly.com/question/29102331

#SPJ6

The law of conservation of energy states that when one form of energy is converted into another, no energy is destroyed in the process. The answer is letter B. Energy cannot be created nor destroyed, it can only be converted from one form into the other.

The study of metals and the process for refining and making things from them is called _____. philosophy
18
metallurgy
inductive reasoning

Answers

The study of metals and the process for refining and making things from them is called metallurgy.Metallurgy is said to be the scientific study both of the extraction and refining process of metals from their ores.This process includes steps such as grinding of the ore also called ore pulverization.Ore is crushed to increase its surface area for purpose of increasing the level of its reactivity.Sometimes, the ore is heated in the presence of oxygen to turn the ore into and oxide. This process is known as roasting.

the answer would be:

C. metallurgy

What is the complete ionic equation for this reaction?2KOH(aq) + H2SO4(aq) → 2H20(1) + K2SO4(aq)
O A. 2K+ + OH + H2SO4 → OH + 2H+ + K2SO4
B. OH + 2H+ + 2H20()
C. 2KOH + H2SO4 → 2H20 + K2SO4
D. 2K+ + OH + 2H+ + SO42- → 2H20() + 2K+ + SO42-
SUBMIT

Answers

Answer:

The answer is "Option D".

Explanation:

The entire ionic equation for all the substances, which are ionic compounds but are available in an aquatic is represented in the form with ions in the full ionic equation.

In the Net ionic equation, it doesn't have the particulate matter throughout the net ionic equations throughout the equations.

In the Spectator ions, it doesn't participate in interactions mostly on reaction and the material hand. From both sides, the very same ions are present.

The evenly balanced chemical formula is,

$2KOH (aq)+ H_2SO_4(aq) \longrightarrow 2H_2O(l) + K_2SO_4$

It is the separate organic compound that full ion formula will match the choice D.

Final answer:

The complete ionic equation for the reaction is 2K+ + 2OH- + 2H+ + SO42- → 2H2O + 2K+ + SO42-.

Explanation:

The complete ionic equation for the reaction 2KOH(aq) + H2SO4(aq) → 2H20(l) + K2SO4(aq) is:

2K+ + 2 OH- + 2 H+ + SO42- → 2 H2O(l) + 2 K+ + SO42-

The equation is balanced in terms of mass and charge by adding spectator ions (K+ and SO42-). The net ionic equation can be obtained by eliminating the spectator ions, leaving only the species that undergo a chemical change.