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3 years ago

15

In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is

equal to the
(1) activation energy
(2) entropy of the system
(3) heat of fusion
(4) heat of reaction

1 answer:

vova2212 [387]3 years ago

5 0

Answer:

4. the heat of reaction

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To which group of biochemicals do steroids belong?

Crank

Lipids and <span>They belong in class amphibia or known as amphibians Amphibians they fall into amphibians It is an amphibian in the Anura family amphibian</span>

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2 years ago

How to separate water from a mixture of rice and peas? Please

svp [43]

Depending on the type of pea, the peas should come to the top as they are lighter and larger. Then just scoop or brush them off into another container. If you separate it into smaller batches and work them one by one, you should then find you get pure rice batches left which you can put in their own container.

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2 years ago

How many atoms of sulfur, S, are in 4.00 g sulfur?

Angelina_Jolie [31]

<h3>Answer:</h3>

7.51 × 10²² atoms S

<h3>General Formulas and Concepts:</h3>

<u>Math</u>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

<u>Chemistry</u>

<u>Atomic Structure</u>

Reading a Periodic Table
Using Dimensional Analysis
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<h3>Explanation:</h3>

<u>Step 1: Define</u>

4.00 g S

<u>Step 2: Identify Conversions</u>

Avogadro's Number

Molar Mass of S - 32.07 g/mol

<u>Step 3: Convert</u>

Set up: $\displaystyle 4.00 \ g \ S(\frac{1 \ mol \ S}{32.07 \ g \ S})(\frac{6.022 \cdot 10^{23} \ atoms \ S}{1 \ mol \ S})$
Multiply: $\displaystyle 7.51107 \cdot 10^{22} \ atoms \ S$

<u>Step 4: Check</u>

<em>Follow sig figs and round. We are given 3 sig figs.</em>

7.51107 × 10²² atoms S ≈ 7.51 × 10²² atoms S

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2 years ago

A barrel of crude oil has a volume of 42 gallons, only approximately 45% of which is processed into gasoline. If your car achiev

balandron [24]

Answer:

The number of barrels of crude oil required to run the car for a year is 52.9 barrels of crude oil

Explanation:

The information given are as follows;

Percentage of crude oil processed into gasoline = 45%

Distance achieved per gallon by car = 36 mi/gal

Distance driven per year = 36,000 miles

$Gasoline\, usage \, in \, one \, year = \dfrac{Distance \ driven\ per \ year }{Distance\ achieved \ per gallon \ by \ car } = \dfrac{36000\, miles}{36\, miles/gallon}$ $\dfrac{36000\, miles}{36\, miles/gallon} = 1000 \, gallons$

∴ Gasoline usage in one year = 1,000 gallons

Percentage of crude oil processed into gasoline = 45%

Hence, where 45% of the crude oil produces 1000, the volume of crude, x, from which the gasoline is sourced becomes;

x × 45/100 = 1000 gallons

x =100 × 1000/45 = 20000/9 gallons of crude

1 barrel of crude oil is approximately 42 gallons of crude oil

∴ 20000/9 gallons of crude = 20000/(9×42) barells of crude = 10000/

Which gives;

$52\tfrac{172}{189} \, barrels \, of \, crude \, oil$

Which is 52.9 barrels of crude oil

Hence the number of barrels of crude oil required to run the car for a year = 52.9 barrels of crude oil.

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3 years ago

Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a ga

Sindrei [870]

Answer: Option (a) is the correct answer.

Explanation:

Sodium bromide (NaBr) is an ionic salt as it is formed by transfer of an electron from sodium to bromine atom.

Whereas $CO_{2}$ , HCN, $N_{2}$ and $NH_{3}$ are all covalent compounds. And, all of them exists as a gas at room temperature.

Also according to rate of diffusion law, rate of diffusion is inversely proportional to square root of molecular weight of gas.

Mathematically, Rate of diffusion = $\frac{1}{\sqrt{M}}$

Out of the given options NaBr has the highest molecular weight which is 102.894 g/mol.

Thus, we can conclude that NaBr is most likely not a gas at room temperature.

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3 years ago