Please help me! i really need the answer i’m crying lol

How many atoms are in an oxygen molecule (O 2 ) ?

saw5 [17]

Answer:

2

Explanation:

8 0

3 years ago

What are two examples of an endothermic reaction and what are two examples of an ectothermic reaction?

natka813 [3]

Exothermic processes: Making ice cubes,formation of snow in clouds

Endothermic processe: Melting ice cubes, evaporation of water

7 0

4 years ago

What happened to the limewater in<br> the experiment? What does this<br> prove?

tensa zangetsu [6.8K]

Explanation:

In the reaction above, we clearly see that a chemical reaction took place but what kind of reaction you might ask?

Looks like it is Thermal decomposition of copper carbonate because decomposition reaction takes place due to the added heat. Decomposition in simple terms in chemical breakdown and here this result is obtained by adding heat.

1) What happened to the lime water?

Although not pictured above, but my assumption is that lime water turned milky or turbid because when CO2 comes in presence of limewater they react to form a percipitate of Calcium carbonate which is the milky color that you get.

2) What does this prove?

- My understanding would be that it proves that CO2 was formed, and that most metal carbonates undergo thermal decomposition into metal oxide and carbon dioxide, and also that a reaction took place since new products were made.

3 0

3 years ago

Consider the chemical equations shown here.

jarptica [38.1K]

Answer:

-1,300 kJ

Explanation:

P₄ + 3 O₂ ⇒ P₄O₆ ΔH = -1,640.1 kJ (EQ 1)

P₄O₁₀ ⇒ P₄ + 5 O₂ ΔH = 2,940.1 kJ (EQ 2)

These are the equations you are given. You need to make these equations into the equation below.

P₄O₆ + 2 O₂ ⇒ P₄O₁₀ (end equation)

Look at the product side of the end equation. You need to produce P₄O₁₀. In the EQ 2, P₄O₁₀ is on the reactant side. Flip the equation. Since you flipped the equation, the enthalpy will have the opposite sign.

P₄ + 5 O₂ ⇒ P₄O₁₀ ΔH = -2,940.1 kJ

On the reactant side of the end equation, you need P₄O₆ and 2 O₂. First, rearrange the equation so that P₄O₆ is on the right side. In EQ 1, P₄O₆ is on the product side. Flip the equation. Like the last one, the sign will change.

Now, cancel out all possible values. P₄ will cancel out since there is one on each side of the equation. Since there is 5 O₂ on one side and 3 O₂ on the other, subtract the two and put the remainder on the side of the larger value.

P₄ + 5 O₂ ⇒ P₄O₁₀ ΔH = -2,940.1 kJ

P₄O₆ + 2 O₂ ⇒ P₄O₁₀

This should be the resulting equation. Now, add the two enthalpies together to find the overall enthalpy.

-2,940.1 kJ + 1,640.1 kJ = -1,300 kJ

The overall enthalpy is -1,300 kJ.

6 0

4 years ago

How are different ions determined?

dimulka [17.4K]

So basing on my understanding of this so far, an atom is an element that has the same number of protons and neutrons, an ion is an element that has different numbers of protons and electrons, an ion is positive when it has more protons than electrons and negative when it has more electrons than ions .

6 0

3 years ago