CHEMISTRY MIDDLE SCHOOL

Which phrase BEST describes a scientific theory A. a statement of pure factB. a collection of data C. a general based on an observable fact D. an EdUcAtEd guess

Answers

Answer 1
Answer:

Answer:

D

Explanation:

Educated guess cause your guessing

Answer 2
Answer: I think it’s B I am not sure lol sry if I didn’t help

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What is the chemical reaction of Water breaks down into hydrogen and oxygen.

Answers

Answer:

electrolysis

Explanation:

i hope that helps you!
Electrolysis, because when an electric current is passed through liquid water it changes the water into two gases

When does incomplete combustion occur?A.
sufficient supply of oxygen

B.
insufficient supply of carbon dioxide

C.
sufficient supply of carbon dioxide

D.
insufficient supply of oxygen

Answers

Answer:

D. insufficient supply of oxygen

Explanation:

Combustion is an exothermic reaction which involves the burning of a compound in the presence of oxygen. Combustion is a very useful life process as it produces heat and light.

For a complete combustion reaction to occur, the compound must be burnt over excess oxygen. The product is usually carbondioxide and water with release of some particulate matter.

In incomplete combustion, there is deficiency of oxygen. Here, oxygen becomes the limiting agent and it drives the reaction to an end. Incomplete combustion is always accompanied with the production of poisonous carbon monoxide and Carbon. We see incomplete combustion when smoke forms or when burning is accompanied by production of soot.

What makes a combustive process complete or not is the availability of oxygen gas for the reaction.

How do you use chemical property in a sentence? (keep it at an 8th-grade science level please)

Answers

Chemical property can be referred to as a reaction into which a substance is changed

What is bias in an experiment?O
A. Something that helps the scientist analyze the data
O
B. Something that makes the experiment more reliable
O
C. Something that makes the experimental results clearer
O
D. Something that pushes the experimental results one way or
another
SUBMIT

Answers

Answer:

  D. Something that pushes the experimental results one way or another

Explanation:

Bias is the tendency of a measurement or outcome to be consistently different from what it would be if all preconceived notions or irrelevant influences were removed. It pushes experimental results one way or another.

Answer:

D.Somethingthatpushestheexperimentalresultsonewayoranother.

Using enthalpies of formation, calculate H.

Answers

ΔH° = -851.5 kJ/mol given that

\begin{array}{cc}\textbf{Species}&{\bf {\Delta H_f\textdegree{}}}\n \text{Fe}_2\text{O}_3\;(s) & -824.2\;\text{kJ}\cdot\text{mol}^(-1)\n\text{Al}_2\text{O}_3\;(s) & -1675.7\;\text{kJ}\cdot\text{mol}^(-1)\end{array}

(Source: Chemistry Libretexts.)

Explanation

Refer to a thermodynamic data table for the standard enthalpy of formation for each species.

Don't be alerted if the data for Al (s) and Fe (s) are missing. Why?

  • The standard enthalpy of formation of a substance measures the ΔH required to form each mole of it from the most stable allotrope of its elements under STP.
  • Both Al (s) and Fe (s) are already the most stable form of their element under STP (note that the state symbol matters.) There's no need to form them again.

As a result, \Delta H_f\textdegree{} = 0 for both Al (s) and Fe (s).

\displaystyle \Delta H_{\text{rxn}}\textdegree{} = \text{Sum of }\Delta H\text{ for all }\textbf{Product} - \text{Sum of }\Delta H\text{ for all }\textbf{Reactant}}\n\phantom{\Delta H_{\text{rxn}}\textdegree{}} = (1* \Delta H_f\textdegree{}(\text{Al}_2\text{O}_3\;(s)) + 1* \Delta H_f\textdegree{}(\text{Al}\;(s)) \n \phantom{\Delta H_{\text{rxn}}\textdegree{}=}-(1* \Delta H_f\textdegree{}(\text{Fe}_2\text{O}_3\;(s)) + 1*\Delta H_f\textdegree{}(\text{Fe}\;(s))

\Delta H_{\text{rxn}}\textdegree{}} = (1 * (-1675.7)) - (1*(-824.2)) = -851.5\;\text{kJ}\cdot\text{mol}^(-1).

The number "1" here emphasizes that in case there are more than one mole of any species in one mole of the reaction, it will be necessary to multiply the \Delta H_f\textdegree{} of that species with its coefficient in the equation.

which industrial city would have fewer air pollution incidents related to temperature inversions one on the great plains or one near the rocky mountains

Answers

I'm not positive, but I believe it would be one near the Rocky Mountains.
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