How many hydrogen(H) atoms are on the reactants side

A.2
B.6
C.12
D.6

Answers

Answer 1

Answer: I’m pretty sure it’s c

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What is the OH- concentration of a solution whose pH is 12.40?

Answers

pH + pOH = pKw = 14

12.40 + pOH = 14

pOH = 14 - 12.40

pOH = 1.6

[OH⁻] = $10 ^(-pOH)$

[OH⁻] = $10 ^(-1.6)$

[OH⁻] = 2.5x10⁻² M

hope this helps!

Which of the following reactions produce oxygen gas? Anaerobic respiration

Photosynthesis

Aerobic respiration

Fermentation

Answers

The correct answer is photosynthesis. Photosynthesis is the process in plants to make their food. This involves the use carbon dioxide to react with water and make sugar or glucose as the main product and oxygen as a by-product.

Ethanol contains the elements carbon, hydrogen, and oxygen. When ethanol burns, it chemically reacts with oxygen gas. C2H6O + O2 ethanol oxygen gas What elements will be present in the substances that are created when ethanol burns?

Answers

Answer:

The elements that will be present after the burning of Ethanol are;

(i) Carbon

(ii) Oxygen

(iii) Hydrogen

Explanation:

The balanced chemical equation for the burning of ethanol is as follow;

C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O

It can be observed in given balanced chemical equation that there three elements involved in this entire reaction. The elements that present in the reactant side are also found on the product side. It means that the elements have just rearranged going from reactant to product.

This means that this reaction is obeying Law of Conservation of Mass which states that mass can neither be created nor destroyed but it can be changed from one form to another hence, to keep the mass on both sides of the reaction balanced the same elements should be present on the product side too.

Answer: carbon, hydrogen, and oxygen only

Explanation: When a chemical reaction occurs, the atoms in the original set of substances are rearranged to form a new set of substances. The number of atoms of each element does not change.

The elements carbon, hydrogen, and oxygen are the only elements present in the original substances, so the only elements in the final substances after the reaction will be carbon, hydrogen, and oxygen, as well. The number of atoms of each element must be the same before and after the reaction.

Which of the following is not an example of a chemical change?.

Answers

Well, I can tell you what a chemical change is and you can get your answer from there. A chemical change is when the very make up of the item is totally changed and can not be changed back. When one compound is converted into a totally new compound having different chemical properties. So... melting an ice cube would be physical and not chemical. Crumbling up a piece of paper would be physical becasue if you uncrumble it, it's still a piece of paper. But Burning paper would be considered chemical becasue now it's ash and you can't get that piece of paper back. I hope this helps!! c:

Answer:

Baking cake

Explanation:

U welcome

Mercury has a specific gravity of 13.6. how many milliliters of mercury have a mass of 0.35 kg