CHEMISTRY HIGH SCHOOL

Increasing temperature increases the number of collisions and the potential energy of the colliding molecules anddecreases the reaction rate.
True or False PLZ HELP!!

Answers

Answer 1
Answer: Increasing temperature does increase the amount of collision but it increases the kinetic energy of the molecules not the potential energy. Potential energy brings molecules together or apart (depending) and kinetic energy makes the molecules move around or not. Hope this helps

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Which of the following is a mixture?Carbon dioxide

Iron

Sugar

Sand

Answers

Of those options, the mixture would be sand.

Because it does not have the same properties, composition or appearance throughout the mixture. (Sand.)

Hope this helped! c:

3. Rank each of the following in order of DECREASING atomic radius
a. Cl, Br, Ga

Answers

Answer:

Br,Ga,Cl?

Explanation:

What is the chemical formula for iron(III) oxide?
(1) FeO (3) Fe3O
(2) Fe2O3 (4) Fe3O=

Answers

The chemical formula for Iron (III) oxide is Fe203.

Which element is so active chemically that it occurs naturally only in compounds?1. Potassium
2. Silver
3. Copper
4. Sulfur

Answers

1) POTASSIUM is an element that is chemically active that it occurs naturally only in compounds.

Potassium is one of the alkali metals; alkali metals are the most active metals.
Potassium is so active that it never occurs free in nature. It always occurs in compounds, combined with other elements.

95% of potassium is used as fertilizers, the remaining 5% is divided into creating potassium hydroxide, potassium chloride solution, and potassium carbonate.

Potassium hydroxide is used to make soaps and detergents.
Potassium chloride is used in pharmaceuticals, medical drips, and saline injections.
Potassium carbonate is used in glass manufacturing; particularly, glass used in television sets.
Other potassium salts are used in making iodized salts, used in baking, tanning leather, and photography.

Final answer:

Potassium is the element that is so active chemically that it occurs naturally only in compounds.

Explanation:

The element that is so active chemically that it occurs naturally only in compounds is potassium.

Potassium is a highly reactive alkali metal that is commonly found in nature bonded to other elements in compounds. It is not found in its pure form due to its reactivity.


An example of a compound that contains potassium is potassium chloride (KCl), which is commonly used as a salt substitute.

Learn more about Potassium here:

brainly.com/question/13321031

#SPJ11

Which of the following is an example of how to supply activation energy to begin a reaction?a. Cool the reaction flask in an ice bath.
b. Add a catalyst.
c. Heat the reaction flask on a hot plate.
d. Add an inhibitor. '

Answers

The event that is an example of how to supply activation energy to begin a reaction is adding a catalyst. The answer is letter B. Cooling the reaction flask in an ice bath, heating the reaction flask on a hot plate. And adding an inhibitor does not answer the question.

CaCO3---> CaO+CO2 How many moles of CaO form when 98.60g CaCO3 decompose? 98.60g CaCO3= ______ mol CaO

Answers

Answer:

0.9852 moles of CaO

Explanation:

Reaction equation for the decomposition of CaCO₃:

CaCO₃ → CaO + CO₂

The question asks how many moles of CaO form when 98.60g of CaCO₃ decompose.

We can see from the reaction equation that for every mol of CaCO₃, one mol of CaO will be produced (molar ratio 1:1)

_____________________________________________________

So first we need to calculate how many moles are the 98.60g of CaCO₃:

Molar Mass of CaCO₃ = molar mass Ca + molar mass C + 3 * molar mass O

                                     = 40.078 + 12.011 + 3 * 15.999 = 100.086 g/mol

Moles of CaCO₃ = mass CaCO₃ / molar mass CaCO₃

Moles of CaCO₃ = 98.60 g / 100.086 g/mol = 0.9852 moles CaCO₃

________________________________________________________

As we said before for every mol of CaCO₃, one mol of CaO is produced.

So the decomposition of 0.9852 moles of CaCO₃ will produce 0.9852 moles of CaO.

Hey I think it is going to be 0986 moles. Cuz we can see that no. of moles of CaCO3 which will decompose is equivalent to the no. of CaO . Now it's just the matter of finding the no. of moles of CaCO3 .

no.of moles=mass /relative molecular mass
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