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3 years ago

Question 1

Chemistry

1 answer:

Kay [80]3 years ago

5 0

Answer:

1. True.

2. False.

3. True.

Explanation:

1. Mass is simply defined as the quantity of matter present in a body. This means that mass gives us an idea of the amount of matter present in any object or body.

Therefore, the answer to the question is True.

2. Weight of an object is simply defined as the gravitational pull of the earth on an object. This implies that location of the object will greatly influence it's weight as the gravitational pull will varies from place to place. Hence, the weight of the object will differ as the location of the object changes.

Therefore, the answer to the question is False.

3. As defined above mass is the amount of matter present in an object.

The mass of an abject is constant irrespective of the location of the object.

Therefore, the answer to the question is True.

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Liquid water is about 800 times denser than dry air under standard conditions. Use kinetic molecular theory to explain this diff

Savatey [412]

<em>Kinetic molecular Theory points:</em>

1. Gases molecules are always in random motion.

2. Gases molecule collide with each other and with the walls of container.

3. Gases molecules total volume is negligible as compare to container.

4. There is no attractive forces between the gases particles

5. K.E is directly proportional to absolute temperature.

<em>Why liquid are denser than gases according to K.M.T:</em>

1. As gases are in random motion, so they have weak forces/ no attractive forces (Acc. to KMT) due to this they are apart as compare to liquid which have stronger forces are closer to each other. So volume of gases will be greater. d= m/v

2. K. E of gases are greater than liquid due to this gases move randomly, apart from each another. Due to this their volume will be greater. d= m/v

3. Gases molecules total volume is negligible as compare to container which show that gases molecules have large spaces between them which causes lower in density.

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3 years ago

Assume that you have developed a tracer with first-order kinetics and k = 0.1 s − 1 . For any given mass, how long will it take

anygoal [31]

Answer: It will take 6.93 sec for tracer concentration to drop by 50% and 13.9 sec for tracer concentration to drop by 75%

Explanation:

Expression for rate law for first order kinetics is given by:

$t=\frac{2.303}{k}\log\frac{a}{a-x}$

where,

k = rate constant = $0.1s^{-1}$

t = age of sample

a = let initial amount of the reactant = 100 g

a - x = amount left after decay process

a) for tracer concentration to drop by 50%

a - x = amount left after decay process = 50

$t=\frac{2.303}{k}\log\frac{100}{50}$

$t=\frac{0.693}{0.1}$

$t=6.93sec$

It will take 6.93 sec for tracer concentration to drop by 50%

b) for tracer concentration to drop by 75 %

a - x = amount left after decay process = 25

$t=\frac{2.303}{k}\log\frac{100}{100-75}$

$t=\frac{2.303}{0.1}\times \log\frac{100}{25}$

$t=13.9sec$

It will take 13.9 sec for tracer concentration to drop by 75%.

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3 years ago

Mercury (Hg) is present in trace amounts in coal, ranging from 50.0 to 200.0 ppb. A typical power plant burns 2.39 million tons

mariarad [96]

Answer:

uuuu

Explanation:

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2 years ago

What is the volume of 1.9 moles of chlorine gas (Cl2) at standard temperature and pressure (STP)?

masya89 [10]

Considering ideal gas behavior, the volume of 1 mol of gas at STP is 22.4 L; then the volume occupied by 1.9 moles is 1.9mol*22.4L/mol = 42. 6 L.

Answer: 43 L

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3 years ago

Read 2 more answers

Consider a 100-gram sample of radioactive cobalt-60.

svetlana [45]

It will take 5.2 years to decay.

The half life of cobalt-60 is 5.2 years. The half life is the time taken for the mass of the substance to decrease by a half.

here, the amount of remaining substance is 50%,

so, $(\frac{1}{2} )^{n} = 0.5$

n. log (0.5) = log (0.5)

n = 1

So it would take 1 half lives to decay this much, which is 1 x 5.2 which is 5.2 years.

what do you mean by radioactive decay ?

The process through which an unstable atomic nucleus loses energy via radiation is known as radioactive decay, also known as nuclear decay, radioactivity, radioactive disintegration, or nuclear disintegration. A material that has unstable nuclei is considered as radioactive.

Learn more about decay here:-

brainly.com/question/13853996

#SPJ1

7 0

2 years ago