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STatiana [176]
3 years ago
9

What does the statement “Mass is conserved during a chemical reaction” mean?

Chemistry
1 answer:
JulijaS [17]3 years ago
3 0
This is the law of conservation of mass, which means that, for ex., if I burn my book, the mass of the smoke, cinders and ashes I'm left with will be the same as my original book. 

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What do all of these things have in common? ______________________________ Bird, dog, tree, person, flower, grass, bacteria, cat
olga2289 [7]
They are all part of the biosphere?
5 0
3 years ago
Write the net ionic equation for the reaction between hydrochloric acid and potassium cyanide. Do not include states such as (aq
zhannawk [14.2K]

Answer: H^++CN^-\rightarrow HCN, product favoured

Explanation:

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we do not include the spectator ions in the equations.

When hydrochloric acid react with potassium cyanide, then it gives potassium chloride and hydrocyanic acid as products.

The complete ionic equation will be:

H^++Cl^-+K^++CN^-\rightarrow K^++Cl^-+HCN

The net ionic equation will not contain spectator ions which are K^+ and Cl^-:

H^++CN^-\rightarrow HCN

The reaction is product favoured.

 

5 0
3 years ago
How many grams of oxygen are required to react with 17.0 grams of octane (c8h18) in the combustion of octane in gasoline?
Keith_Richards [23]
The balanced equation for the combustion of octane is as follows
2C₈H₁₈ + 25O₂ ---> 16CO₂  + 18H₂O
stoichiometry of C₈H₁₈  to O₂ is 2:25
number of octane moles reacted - 17.0 g / 114.2 g/mol = 0.149 mol 
according to molar ratio 
if 2 mol of octane reacts with 25 mol of O₂
then 0.149 mol of octane reacts with - 25 /2 x 0.149 mol = 1.86 mol of O₂
 mass of O₂  - 1.86 mol x 32 g/mol = 59.5 g
59.5 g of O₂ is required to react with 

8 0
3 years ago
A scientist wants to perform a reaction in a vacuum chamber to control the experiment as much as possible and to prevent other v
Shalnov [3]

Yes, it is a correct approach because endothermic reactions absorb heat. In consequence, the amount of heat can be used to classify this reaction.

<h3>Endothermic and exothermic reactions</h3>

An exothermic reaction is a type of chemical reaction that releases heat, thereby increasing the temperature of its surrounding environment.

Conversely, an endothermic reaction can absorb heat, thereby cooling its surrounding environment.

In consequence, the amount of heat measured after the reaction can be indicative of the type of chemical reaction.

Learn more about endothermic reactions here:

brainly.com/question/6506846

8 0
3 years ago
Hello! can a rock transform in to ANY type of rock? and why or why not
Oxana [17]

Answer:

yes it can

Explanation:

because, it depends on where the rock is, for example on a dessert it would Be cracked and things like that if near an eruption it would be the flamey black rock, and so on you get it

3 0
3 years ago
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