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Oxana [17]
3 years ago
9

What is the difference between chemical change and physical change

Chemistry
1 answer:
Nadusha1986 [10]3 years ago
7 0
In a physical change the appearance or form of the matter changes but the kind of matter in the substance does not. However in a chemical change, the kind of matter changes and at least one new substance with new properties is formed. Hope this helps!
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How many grams of Fe2O3 will be produced from 10.0 g of Fe and 7.00 g of O2?
Monica [59]

Answer:

0.01790670606142 we assume you converting between moles fe and gram. you can reveiw more details on each measurement unit: molecular weight of fe or grams the sI base unit for amount of substance is the mole.1 mole is equal to 1 moles fe,or 55.845 grams

3 0
3 years ago
Read 2 more answers
Scoring Scheme: 3-3-2-1 Use one of your experimentally determined values of k, the activation energy you determined, and the Arr
Lena [83]

Answer:

K = 2.7x10⁻⁵ at 25ºC

Explanation:

A way to write Arrhenius equation is:

ln K = - Ea/R × (1/T) + lnA

If you graph ln K as Y and 1/T as X (Absolute temperature in K), the equation you will obtain is:

Y = -13815X +35.817

R² = 0.9927

(Taking the last k point as 0.0386) (ln 0.0386), <em>0.1386 has no sense</em>)

Your slope is -13815

-13815K = - Ea/R

-13815K×8.314J/molK = 114858J/mol = Ea

And your intercept =

lnA = 35.817

A = 3.59x10¹⁵

Now, you want to know rate constant at 25ºC = 298.15K. Replacing in the equation (Where Y is ln (activation energy) and X is 1/T):

Y = -13815X +35.817

Y = -13815(1/298.15K) +35.817

Y = -10.5187

lnK = -10.5187

<h3>K = 2.7x10⁻⁵ at 25ºC</h3>

8 0
3 years ago
What are the reactants in a neutralization reaction? two elements an acid and a base an element and a compound a salt and water
Vitek1552 [10]

ok thank you for elaborating and you are correct in a neutralization reaction the reactants are the acid and base. the salt and water would be the product and the two elements could be anything meaning that it is most likely a mixture

Hope this helps

5 0
3 years ago
Read 2 more answers
How does a molecule differ from an atom?
Eddi Din [679]

Answer:

According to my research A molecule is two or more atoms held together by covalent bonds. An atom is the smallest part of an element. ... A sodium atom has one outer electron, and a carbon atom has four outer electrons.

Explanation:

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3 years ago
21. A good transition state analog
hammer [34]

Answer:

hhgjghjfgjfghj

Explanation:

4 0
3 years ago
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