CHEMISTRY HIGH SCHOOL

He statement "matter can be neither created nor destroyed by chemical means, but it can be changed from one form to another" is the chemical law of A. conservation of matter.
B. atomic disintegration.
(C.) conservation of energy.
D. definite proportions.

Answers

Answer 1
Answer: Law of C. conservation of energy states that energy can neither be created nor destroyed, but can be changed from one form to another (such as from potential energy to kinetic energy).

Hope this helps~

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Find the mistake
Cu(NO3)2(s) + CuO(s) → 2NO(g) + O3(g)

Answers


there are 2 copper atoms on the left side of the arrow, but none on the other side. there are also 7 oxygen atoms on the left hand side, but only 5 on the right hand side of the arrow.

What is the hardest form of carbon

Answers

The hardest form of carbon is diamond.
i believe the answer is diamond. hope this helps!

The atom in a sample of an element must contain nuclei with the same number of?

Answers

Hey there! 

Answer: Protons 

The atom in a sample of an element must contain nuclei with the same number of protons. If the protons change in number, then the element will modify as well. 

Thank you!

When the solids ba(oh)2 and nh4scn are mixed, a solution is produced and the temperature drops. ba(oh)2 (s) 2nh4scn(s) → ba(scn)2 (aq) 2nh3 (g) 2h2o(l) which statement about the energetics of this reaction is correct? a. the reaction is endothermic and h is negative. b. the reaction is endothermic and h is positive. c. the reaction is exothermic and h is negative. d. the reaction is exothermic and h is positive.

Answers

In the given chemical reaction:

Ba(OH)2 (s) + 2NH4SCN (s) → Ba(SCN)2 (aq) + 2NH3 (g) + 2H2O (l)

Since the temperature drops, it indicates that heat is being absorbed from the surroundings. This implies that the reaction is absorbing heat and is, therefore, an endothermic reaction.

Among the options provided, the correct statement about the energetics of this reaction is:

b. the reaction is endothermic and ∆H is positive.

Final answer:

The reaction between Ba(OH)2 and NH4SCN is endothermic and the enthalpy change (ΔH) is positive. This is because the reaction absorbs heat from the surrounding environment, causing the temperature to drop. The ΔH is positive in this type of endothermic reaction.

Explanation:

When solids Ba(OH)2 and NH4SCN are mixed, a solution is produced and the temperature drops. This indicates that the reaction is endothermic, which means it absorbs heat from the surroundings. As a result, the surroundings (or in this case the solution) will experience a decrease in temperature. According to the conventions used in chemistry, in an endothermic reaction, the enthalpy change (ΔH) is positive. Hence, the correct statement about the energetics of this particular reaction is: 'The reaction is endothermic and ΔH is positive.'

When considering the enthalpy change of a reaction, it's also key to understand that an exothermic reaction results when the bonds in the products are stronger than the bonds in the reactants - this is characterized by a negative ΔH (heat is released). In contrast, bonds in the products of an endothermic reaction are weaker than in the reactants, resulting in a positive ΔH (heat is absorbed).

Learn more about Enthalpy Change here:

brainly.com/question/32882904

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What is the best safety practice recommended before leaving the chemistry laboratory?

Answers

Answer:

Washing your hands properly.

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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