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3 years ago

Compare and contrast: element, atom, isotope

Chemistry

2 answers:

blsea [12.9K]3 years ago

7 0

Answer:

Element is made up of the atoms or isotopes. Isotopes are where only neutrons change in number, such as 3 turning to 2 or to 5. Atom is where it is not changed and it is the original, and example is instead of Carbon13 it is just Carbon. I hope this helps.

sveticcg [70]3 years ago

5 0

Answer:

Isotopes are atoms that have the same numbers of protons but different numbers of neutrons. An ion is an atom that has gained or lost electrons, so it now has more or fewer electrons than it does protons. So an ion has a negative or positive charge.

Explanation:

it does

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I need help with question 5 whoever helps could get Brainlest or extra credit

Scrat [10]

1 is c 2 is b 3 is 1 d 4 is a

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3 years ago

When the concentrations of CH 3 Br and NaOH are both 0.100 M, the rate of the reaction is 0.0030 M/s. What is the rate of the re

mash [69]

Answer : The rate of the reaction if the concentration of $CH_3Br$ is doubled is, 0.006 M/s

Explanation :

Rate law : It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

The balanced equations will be:

$CH_3Br+NaOH\rightarrow CH_3OH+NaBr$

In this reaction, $CH_3Br$ and $NaOH$ are the reactants.

The rate law expression for the reaction is:

$\text{Rate}=k[CH_3Br][NaOH]$

As we are given that:

$[CH_3Br]$ = concentration of $CH_3Br$ = 0.100 M

$[NaOH]$ = concentration of $NaOH$ = 0.100 M

Rate = 0.0030 M/s

Now put all the given values in the above expression, we get:

$0.0030M/s=k\times (0.100M)\times (0.100M)$

$k=0.3M^{-1}s^{-1}$

Now we have to calculate the rate of the reaction if the concentration of $CH_3Br$ is doubled.

$\text{Rate}=k[CH_3Br][NaOH]$

$\text{Rate}=(0.3M^{-1}s^{-1})\times (2\times 0.100M)\times (0.100M)$

$\text{Rate}=0.006M/s$

Thus, the rate of the reaction if the concentration of $CH_3Br$ is doubled is, 0.006 M/s

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4 years ago

The excretory system consists of which of the following organs?

nirvana33 [79]

C. <span>kidneys, ureters, urinary bladder is the correct answer~</span>

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4 years ago

You are to give ampicillin, with a recommended dose of 25 mg/kgmg/kg , to a child with a mass of 24 kgkg . If stock on hand is 2

Anastasy [175]

Answer:

2.4 capsules

Explanation:

You are to give ampicillin, with a recommended dose of 25 mg/kg (25 mg of ampicillin per kg of body weight), to a child with a mass of 24 kg. The mass of ampicillin to be given is:

24 kg body mass × (25 mg ampicillin/ 1 kg body mass) = 600 mg ampicillin

The stock on hand is 250 mg/capsule (250 mg ampicillin per capsule). The number of capsules required to supply 600 mg of ampicillin is:

600 mg ampicillin × (1 capsule/250 mg) = 2.4 capsule

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3 years ago

Which of the following is true? A). An indicator is not pH sensitive. B). The equivalence point...

Pepsi [2]

Answer:

B). The equivalence point is where the amount of acid equals the amount of base during any add-base titration.

Explanation:

Equivalence point -

During the process of titration of the neutralization reaction , like acid - base reaction .

In the titration process , the equivalence point is the point , when the amount of acid is equal to the amount of base .

In indicator used for th process is pH sensitive ,

It is not always necessary to have pH = 7 at the equivalence point ,

The titration curve is plotted for the pH v/s base .

Hence , from the given options , the correct statement is ( B ) .

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4 years ago