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3 years ago

Which of the following is a balanced equation?Select one:a. Ab. Bc. Cd. D

Chemistry

2 answers:

Nadusha1986 [10]3 years ago

6 0

Answer:

so A

Explanation:

balanced chemical equation occurs when the number of the different atoms of elements in the reactants side is equal to that of the products side. Balancing chemical equations is a process of trial and error

podryga [215]3 years ago

5 0

Answer:

Explanation:

KClO3 ==> KCl + O2

1 K 1

1 Cl 1

3 O 2

There are a different amount of oxygen atoms so this equation is not balanced

KClO3 ==> 3KCl + O2

1 K 3

1 Cl 3

3 O 2

None of the elements have the same number of atoms on either side of the equation therefore this equation is not balanced.

2KClO3 ==> KCl + 3O2

2 K 1

2 Cl 1

6 O 6

The number of potassium atoms and chlorine atoms is different on both sides of the equation therefore this equation is not balanced.

2KClO3 ==> 2KCl + 3O2

2 K 2

2 Cl 2

6 O 6

The number of atoms of each element are the same on both sides therefore this equation is balanced.

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Taylor, a MIC 206 student needs to determine the OCD of a sample of Escherichia coli. She performed dilutions using four 9 ml di

Troyanec [42]

Answer:

1.37 x $10^6$ CFU/mL

Explanation:

First, the dilution factor needs to be calculated.

Since four 9 ml dilution blanks were prepared, the dilution factor that yielded 137 colonies is of $10^{-4}$ .

Next is to divide the colony forming unit from the dilution by the dilution factor:

137/ $10^{-4}$ = 137 x $10^4$

In order to get the CFU/ml, divide the CFU from the dilution by the plated volume (1 mL) from the final dilution tube.

137 x $10^4$ /1 = 1.37 x $10^6$

Hence, the CFU/ml present in the original <em>E. coli </em> sample is 1.37 x $10^6$ .

cfu/ml = (no. of colonies x dilution factor) / volume of culture plate

7 0

3 years ago

Is water wet? I give you a lot of points

UkoKoshka [18]

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6 0

3 years ago

Read 2 more answers

2. A shopper in a supermarket takes a box of sugar from a shelf that is 1.5 m high because he is

muminat

Explanation:

kinetic energy?? idek hope I helped in anyway possible

7 0

3 years ago

How much 6.0 m hno3 is needed to neutralize 39ml of 2 m koh

Sever21 [200]

Answer:

13mL

Explanation:

Step 1:

The balanced equation for the reaction. This is given below:

HNO3 + KOH —> KNO3 + H2O

From the balanced equation above, we obtained the following data:

Mole ratio of the acid (nA) = 1

Mole ratio of the base (nB) = 1

Step 2:

Data obtained from the question.

This includes the following:

Molarity of the acid (Ma) = 6M

Volume of the acid (Va) =?

Volume of the base (Vb) = 39mL

Molarity of the base (Mb) = 2M

Step 3:

Determination of the volume of the acid.

Using the equation:

MaVa/MbVb = nA/nB, the volume of the acid can be obtained as follow:

MaVa/MbVb = nA/nB

6 x Va / 2 x 39 = 1/1

Cross multiply to express in linear form

6 x Va = 2 x 39

Divide both side by 6

Va = (2 x 39)/6

Va = 13mL

Therefore, the volume of the acid (HNO3) needed for the reaction is 13mL

5 0

3 years ago

Without consulting Appendix B, arrange each group in order of decreasing standard molar entropy (S°). Explain.(b) NO₂(g), NO(g),

denpristay [2]

The decreasing order of standard molar entropy (S°) is as follow:

NO₂(g) > NO(g) > N₂(g)

<h3>What is Entropy? </h3>

Entropy is defined as the randomness of the particle. It depends on temperature and pressure or number of particle per unit volume.

It is directly proportional to the temperature and pressure of the gas.

<h3>What is Standard Molar Entropy? </h3>

The standard molar entropy is defined as the entropy content of the one mole of pure substance at the standard state of temperature and pressure of interest.

The standard molar entropy is also defined as the total amount of entropy which 1 mole of the substance acquire, as it is brought from 0K to standard conditions of temperature and pressure.

The standard molar entropy depends on the molas mass of atom, molecules or compound.

N₂ has lower standard molar entropy. This can be explained as this molecule consist of same atom.

While, Complexity increases from NO to NO₂(g). Therefore, the standard molar entropy of NO₂(g) is greater than NO.

Thus, we concluded that the decreasing order of standard molar entropy (S°) is as follow:

NO₂(g) > NO(g) > N₂(g)

learn more about standard molar entropy:

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8 0

1 year ago

Which of the following is a balanced equation?Select one:a. Ab. Bc. Cd. D​

Which of the following is a balanced equation?Select one:a. Ab. Bc. Cd. D