Approximately how many elements are there that combine chemically in a great number of ways to produce compounds? A. 25 B. 50 C .75 D.100

Answers

Answer 1

Answer:

Answer:

The correct answer is D.

Explanation:

A chemical compound is any substance composed of identical molecules formed by atoms of two or more chemical elements. All matter in the universe is composed of atoms of more than 100 different chemical elements. These elements are found in pure form and combined form in chemical compounds.

Have a nice day!

Answer 2

Answer: 100 as there’s approximately 100 discovered elements

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A student tested a sample of carbon (C) by combining it with water. There was no reaction between the carbon and water. The student concluded that carbon must be a group 18 element, since it was unreactive. State whether you agree with the student's reasoning, and explain why or why not?

12a. Do i need to find the morality of each ion in the solution to get to the moles? Or do i just do AlCl3

Answers

You just use the morality of the solution, you found out that you have 0.0046mol (about 0.005mol0 of AlCl3, so then since there is 1 Al in a single molecule, you have the number of moles of aluminum, but since there is Cl3 (3 atoms of chlorine per molecule), just multiply the number of moles of molecules by the number of atoms of that type inside a single molecule, to get [Cl-] = 0.0138mol (or round to 0.014)

A chemistry student must separate should barium sulfate from the aqueous solution. Equipment and glassware normally found in the chemistry classroom are available to the student.Describe how the student could separate the solid barium from the aqueous solution. Be sure to list the lab equipment needed to do the procedure
Explain how each item is used in the procedure
List any safety equipment needed and how it is used in the procedure
Describe how this procedure might be used in a situation outside the chemistry classroom

Answers

If there's just some barium put in an aqueous solution, then it should be something like this.
It's a mixture of a solution and an insoluble solid, so the easiest way to go is through filtration. (Also, I'm assuming the barium is cut into very small chips.)

In a line, simply filter the solution using a folded filter paper in a funnel, collect the residue in a beaker or flask, rinse it with distilled water and let it dry. (Or simply filtering it could be enough, depending on how far your teacher wants you to go.)

Stuff needed:
>filter paper (for separating the solid from the solution)
>funnel (to hold the filter paper)
>beaker or flask (to hold the filtrate)
>distilled water (to rinse the solid)
>spatula (to scoop up the solid)

Procedure:
>Fold filter paper and line the funnel with it. Place the funnel in the flask or beaker.
>Pour solution in. Then add water (I think using tap water might be fine in this case, but you can use distilled water if you'd like) to wash out the container with the solution of any solid you may have not gotten in the first try. Alternatively, you could use a spatula to spoon it onto the filter paper.
>Once everything has been filtered, pour some distilled water on the residue on the filter paper to wash away the solution.
>Take out the filter paper, open it up and let it dry.

This can be used in real life in many occasions. For example, when you make tea, you need to filter the leaves out. Or when you cook the pasta, you put it in a sieve to separate the pasta from the water. Or when you fish using fishing nets, you "filter" the fish from the water.

Gas-to-liquid synfuel production can produce diesel, naptha and paraffin. The formation of these products usually involves _____. the Fischer-Tropsch Process the removal of carbon atoms from the fuel adding highly acidic substances such as hydrochloric acid the production of radioactive waste that must be stored in protective barrels

Answers

The best and most correct answer among the choices provided by the question is the second choice. The formation of gas-to-liquid synfuel usually involves the removal of carbon atoms from the fuel adding highly acidic substances such as hydrochloric acid. I hope my answer has come to your help. God bless and have a nice day ahead!

The formation of these products usually involves THE FISCHER-TROPSCH PROCESS.

The Fischer-Tropsch process refers to a series of chemical reactions which convert hydrogen and carbon monoxide into liquid hydrocarbons in the presence of metal catalysts. The temperature utilized in the process is normally between 150 and 300 degree Celsius. The techniques was developed by Franz Fischer and Hans Tropsch in 1925. The technique is usually used to turn coal into liquid and to turn gases to liquid fuels.

Which nuclear decay emission has the weakest penetrating power?1. alpha particle
2. bera particle
3.gamma radiation
4. positron

Answers

Alpha particle is the nuclear decay emission that has the weakest penetrating power. The correct option among all the options that are given in the question is the first option or option "1". Gamma is a type of radiation and so can be negated as a particle. Alpha particles have the largest radiation and so the weakest penetrating power.

The _______ receives digested food components and stores the glucose to be released into the blood stream for future use.A. liver
B. stomach
C. small intestine
D. large intestine

Answers

Answer:

The correct answer is A).Liver

Explanation: The liver receives digested food components and stores the glucose to be released into the bloodstream for future use, NOT the small intestine or large intestine

I AM 100% CONFIDENT WITH THIS ANSWER TRUST ME!!!

I know it is NOT small intestine, so Large Intestine.

A farmer had an accident and spilled a chemical into his pond. Several days later, he notices many dead frogs around the pond. That summer, the number of gnats around the pond was higher than ever. This is becausea. the chemical is good for the gnats.
b. the frogs are a limiting factor for the gnats.
c. the gnats are a limiting factor for the frogs.
d. the chemical is a limiting factor for the gnats.

Answers

Answer:

The correct answer is option b.

Explanation:

A limiting factor or limiting reagent is a compound of reactant which gets used up first and effects the formation of product in a chemical reaction.

Around the pond frog would be feeding on gnat, and due to their presence population of gnats were in control .But due to accidental spilling of chemical in pond resulted in death of frogs. Which were actually responsible for less population of gnats around the pond but due to dead action of chemical on them (frogs) their population in pond declined due to which increase in population of gnats was observed.

On generalizing this fact:

Higher the population of frogs lower will be the population of gnats.
lower the population of frogs higher will be the population of gnats.

So, from this we can conclude that frogs are the limiting factors for the gnats as more the number of frogs lessor will be number of gnats.

b. the frogs are a limiting factor for the gnats
the frogs limit the reproduction of the gnats, and therefore with less frogs the gnat population can increase

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