2 years ago

7. What are two ways to improve an experiment?

1 answer:

5 0

Answer:

Stopwatches versus clocks. To improve reliability repeat the experiment multiple times according to an identical procedure. Record these steps so the experiment can be repeated at any time

Explanation:

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marusya05 [52]

It is an endothermic process

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3 years ago

What state of matter has the most kinetic energy

kvv77 [185]

Answer: Gas

Explanation:

since the gas molecules arent being forcefully bonded together like a solid would be, and liquids tend to have lower kinetic energy than solids

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3 years ago

Using the reaction below: 2 CO2(g) + 2 H2O(l) → C2H4(g) + 3 O2(g) ΔHrxn= +1411.1 kJ What would be the heat of reaction for this

maw [93]

Answer: d) -705.55 kJ

Explanation:

Heat of reaction is the change of enthalpy during a chemical reaction with all substances in their standard states.

$2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g)$ $\Delta H=+1411.1kJ$

Reversing the reaction, changes the sign of $\Delta H$

$C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)$

$\Delta H=-1411.1kJ$

On multiplying the reaction by $\frac{1}{2}$ , enthalpy gets half:

$0.5C_2H_4(g)+1.5O_2(g)\rightarrow CO_2(g)+H_2O(l)$ $\Delta H=\frac{1}{2}\times -1411.1kJ=-705.55kJ/mol$

Thus the enthalpy change for the given reaction is -705.55kJ

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What is another common name for the lanthanoids on the periodic table?

RUDIKE [14]

Lanthanide Lanthanoid, also called Lanthanide

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A company sells a natural medicine with plant ingredients to help treat dementia, a disease in which people have a hard time rem

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I think it is the second one. hope it helps! :)

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