CHEMISTRY HIGH SCHOOL

Which one of the following equations is not balanced?6H2O + 6CO2 ---> C6H12O6 + 6O2
C7H16 + 11O2 ---> 7CO2 + 8H2O
PCl2 + 4H2O --->H3PO4 + 5HCL
Fe3O4 + 4H2 ---> 3Fe + 4H2O

Answers

Answer 1
Answer: The key inthe balancing of chemical reaction is to make sure that you got the exactchemical formula of the substance that is reacting and the yielded product.After getting the formula, identify first the hardest element/atom to bebalanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such asO, H. Make sure to note the atoms present in the molecule of the substance. Amongthe three equations, PCl2 + 4H2O --->H3PO4 + 5HCL is not balanced. Thehardest element here is the Cl. Observe that there are 5Cls in the product sideso you must add 5 to the PCl2. However, there are only 2Cl atoms and it needs3 to balance the equation. Also, there is no P in the product side. This equationis invalid.
Answer 2
Answer: The third one is incorrectly balance because the are only two chlorine on the reactant side and five on the product side. The correct balanced equation is 2PCL2 + 8H2O -> 2H3PO4 + 5H2 + 4Cl. The reason HCl is broken into two parts is because it is a strong acid and would immediately dissolve if put together.

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The atomic theory has been revised many times over the last several hundred years. John Dalton described the atom as a solid sphere while later scientists such as J.J. Thomson and Ernest Rutherford developed different models of the atom. Why has the atomic theory changed so much over the last several centuries? A new scientific method helps scientists form more efficient theories and models.As new discoveries are made, existing theories are revised or replaced.The atom has changed over time, and new theories must reflect those changes.Scientists with different opinions
How many total electrons can be contained in the 4d sublevel? 261014

What percentage of atoms in the entire universe are hydrogen atoms?

Answers

The 90 percentage of atoms in the entire universe are hydrogen atoms.

What is the composition of atoms in universe?

  • The most abundant element is hydrogen.
  • The 90% mass of universe is made of hydrogen and 10% of helium atoms.

Why most of the universe is made of the hydrogen?

  • Since, hydrogen atom have only one proton and one electron and no neutron .

learn about hydrogen atoms,

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the percentage of atoms in the universe that are hydrogen are 90%

The amount of carbon in the atmosphere is about _____ of the total amount of carbon on Earth.a. 0.01%
b. 0.1%
c. 1%
d. 10%

Answers

Answer:

a) 0.01 %

Explanation:

The carbon in the atmosphere is mainly in the form of carbon dioxide (CO2).

The ammount of carbon is arround 700 gigatons and they represent the 0.01 % of the carbon on Earth.

C is the correct answer

Use a graphic orginiser to show how Thomason's model of the atom is like and different fro, Dalton's model

Answers

Answer:

Atomic models have similarities and differences

Explanation:

Hi

Dalton proposes an indivisible model of the atom.

Thomson proposes an atom formed by negative electric charges (electrons) embedded in a positive mass.

successes with your homework

What does the term compound mean?

Answers

A compound is a substance formed when two or more chemical elements are chemically bonded together.
compound is a thing that is composed of two or more separate elements; a mixture

Which of these statements is true about reaction rates is accurate? a. all chemical reactions occur at a slow rate.
b. all chemical reactions at the same rate.
c. all chemical reactions at a fast rate.
d. all chemical reactions occur at different rates.

Answers

all chemical reactions occur at different rates due to difference in their kinetic energy option D is right hope this helps

Hi there!

Analyzing This Question Correctly We Can conclude thatthe Most accurate  and correct answer is D.

We Can conclude to this By using The collision theory.The Collision Theory states that in order for a reaction to proceed, the reactant particles must collide.  The more successful collisions there are per unit of time, the faster the reaction will be.

Factors which can affect the rate of a reaction include:

⚛ concentration

⚛ temperature

⚛ particle size

⚛ catalysts

⚛ stirring rate

⚛ light intensity

For Example, By adding less Baking soda to Vinegar the less Co2(Carbon Dioxide) Will Be created.

By Adding More Baking Soda to vinegar, more Co2 Will Be created.

Hope This Has helped

--Adan M

An experiment applies heat to a substance and produces a gas that is a new and different substance. Choose the true statement.A. This represents a physical change only.
B. This represents a chemical change only.
C. This represents both a physical and a chemical change.
D. This represents neither a physical change nor a chemical change.

Answers

I believe it is C; reasoning being that the hint for physical change is," the producing of a gas," chemical "that's new and diff. substance. "
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