CHEMISTRY HIGH SCHOOL

The statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law ofa. conservation of energy.
b. conservation of matter.
c. atomic disintegration.
d. definite proportions.

Answers

Answer 1
Answer:

your answer is b. conservation of matter.

i just took the test
Answer 2
Answer:

Answer: b. Conservation of matter.

Explanation:

Law of conservation of matter states that matter can neither be created nor destroyed by means of chemical reaction but can be changed from one form to another.

It means that the amount of matter remains the same after a chemical change.

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Calculate the pH of a solution in which [OH–] = 4.5 × 10–9M.8.356.114.945.65 - this one is correct
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The nucleus of an atom X contains 15 protons and 16 neutrons. a) Determine the number of electrons of this atom.​

In which type of chemical reaction do two or more reactants combine to form one product, only?a. synthesis
b. decomposition
c. single replacement
d. double replacement.

Answers

A chemical reaction is defined as the process in which two more reactants are converted to form one or more different product.

The chemical reaction in which two more reactants combine to form one product is a synthesis reaction.

Synthesis reactions are defined as the reaction in which two different atoms or molecules react to form a different compound. Synthesis reactions are exothermic reactions, such that the reactions release energy in the form of heat and light.

One of the most common examples of a synthesis reaction is the formation of sodium chloride. It can be expressed as:

Na (Sodium) + Cl (Chlorine) \rightarrowNaCl (Sodium Chloride)

Thus, the synthesis reaction will result in one different compound or product.

The correct answer is Option A.

To know more about synthesis reaction, refer to the following link:

brainly.com/question/24936069
Synthesis is when multiple reactants come together to form one. Decomposition is when one reactant breaks down to form multiple products which are either elements or compounds. Single replacement is when there is an element and a compound and the element switch spots with the other element( metal switch with metal, nonmental with nonmetal, vice versa). The element has to be more reactive than the like element in the compound in order for it to be able to switch. Use the reactivity series to help you with this. Double Replacement is when you have two compounds and like elements switch places.

Gravity is an example of what

Answers

Answer:Some examples of the force of gravity include;

-The force that holds the gases in the sun.

-he force that causes a ball you throw in the air to come down again.

-The force that causes a glass you drop to fall to the floor.

-The force that keeps the Earth and all of the planets in line in the proper position in their orbits around the sun.

-The force that causes an apple to fall downward from an apple tree.

-he force that keeps you walking on Earth instead of floating away into space.
May be force is the example of garvity ...

Which compound is used to make asphalt?

Answers

Answer:

a saturated hydrocarbon that has more than 35 carbons in its chain

Explanation: Alkanes with a chain length of approximately 35 or more carbon atoms are found in bitumen (asphalt), used (for example) in road surfacing. However, the higher alkanes have little value and are usually split into lower alkanes by cracking.
Asphalt is a biproduct of making gasoline, diesel, kerosene, jet fuel, all from crude oil pumped from the ground. Asphalt is the garbage or waste that comes out the bottom of the process of distilling those products. They heat the thick oily-sooty gunky asphalt and mix it with rock or sand and make roads out of it. So the compound would be the long hydrocarbon chains.

Please help :)1: Catalysts lower the activation energy of chemical reactions. How does this benefit the environment?

2: Chlorine free radicals are produced in the upper atmosphere when ultraviolet radiation interacts with chlorofluorocarbons (CHCs). The free radicals catalyze the conversion of ozone to oxygen. How is this catalysis harmful to humans

Answers

1. By using less energy, reactions that are catalysed are also more sustainable, and therefore better for the environment.

2. By catalysing the conversion of ozone into oxygen, the ozone layer sees a reduction, also reducing the amount of protection from direct UV rays given to humans and other forms of life by the ozone layer.

What is required for a chemical reaction to occur?(1) standard temperature and pressure(2) a catalyst added to the reaction system(3) effective collisions between reactant particles(4) an equal number of moles of reactants and products

Answers

I think the correct answer is option 3. A requirement for a chemical reaction to happen is an effective collisions between the reactant particles because it is where the electrons in the reactants interact with each other and form new substances.

Explain how tectonic plate movement could create another supercontinent like pangaea(and one thing on picka subject were is science )

Answers


The plates are moving and are for billions of years... they collide and that they rip apart. The plates carry the continents on their "backs"; if 2 plates -each with a continent- collide, then a supercontinent is created. The landmass of Asian nation accustomed be an isolated block concerning 30-50 million years ago; it 1st crashed into Asia to form the range of mountains. If the movement of the plates brought all the continents along once more, one continent would type. At the instant plate, movements aren't heading in this direction.
in millions of years, people say that, since there are two plates away from each other moving, will one day meet in the middle, creating one large land mass.
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