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2 years ago

Question 1

Chemistry

1 answer:

Bumek [7]2 years ago

7 0

Answer:

the average kinetic energy will double as well

Explanation:

According to the kinetic molecular theory of gases, the average kinetic energy of the particles in a substance is directly proportional to the absolute temperature of the gas (in Kelvin).

Mathematically:

$KE=\frac{3}{2}kT$

where

KE is the average kinetic energy of the particles in a gas

k is the Boltzmann constant

T is the absolute temperature of the gas

From the equation, we see that

$KE\propto T$

In this problem, the absolute temperature of the gas is doubled, so the new temperature is

$T'=2T$

Therefore, the new kinetic energy of the molecules will be

$KE'\propto T' = 2T \propto 2KE$

So, the average kinetic energy will double as well.

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Your little sister asks you a scientific question: "Does chocolate milk come from brown cows?" In order to answer the question,

aksik [14]

Answer:

Hey there,

Your answer is iii. Brown cows produce white milk. (1 point) and ii. Brown cows never produce chocolate milk. (1 point)

You already know from the basic understanding that chocolate comes from beans, not cows, and is added to milk, and thereby- brown cows do not produce chocolate milk. You also know that they produce white milk.

Wbob1314

if you have any questions I INSIST you ask them in the comments.

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2 years ago

To save time you can approximate the initial volume of water to ±1 mL and the initial mass of the solid to ±1 g. For example, if

WARRIOR [948]

Answer:

20.2 g silver placed in 21.6 mL of water and 20.2 g copper placed in 21.6 mL of water

Explanation:

Since the density formula is mass divided volume, you can calculate the density of each of the components of the group and see which of all the groups are equal

In the group

density Ag=20.2 g silver/21.6ml H2O=0.9352g/ml

density Cu=20.2 g copper/21.6ml H2O=0.9352 g/ml

6 0

2 years ago

Read 2 more answers

Fluorine gas is placed in contact with calcium metal at high temperatures to produce calcium fluoride powder. What is the formul

Mars2501 [29]

Answer:

Upper F subscript 2 (g) plus upper C a (s) right arrow with delta above upper C a upper F subscript 2 (s).

Explanation:

This is a chemical reaction problem.

In expressing any chemical reaction, we need to understand that there are reactants and products.

The reactants are the species on the left hand side that are combining.

The products are the species on the right hand side that are formed.

Every chemical reaction is obeys the law of conservation of matter i.e equal number of matter on both sides.

Using the statement of this problem, we can deduce that;

Reactants are Fluorine gas and Calcium metal

Product is Calcium Fluoride

Note: A metal is a solid(s) and powder is a solid(s). A gas is denoted as (g). They depict the state of the species reacting.

F₂ $_{(g)}$ + Ca $_{(s)}$ → CaF₂ $_{(s)}$

We can see that equal number of atoms are on both sides of the expression.

7 0

2 years ago

Read 2 more answers

What would have happened to your results if during the dehydration some of the copper (ii) sulfate splatter out of the crucible-

lidiya [134]

Answer : The results would show more amount of water in the hydrated sample.

Explanation :

The amount of water of crystallization can be found by taking the masses of hydrated copper sulfate and anhydrous copper sulfate.

The difference in masses indicates the mass of water lost during dehydration process.

If during dehydration process, some of the copper sulfate spatters out of the crucible, then this would give us less mass for anhydrous sample than the actual.

As a result, the difference in masses of hydrated sample and the anhydrous sample would be more.

Therefore the results would show more amount of water in the hydrated sample.

4 0

2 years ago

Before landing, the brakes and the tires of an airliner have a temperature of 15.0∘C. Upon landing, the 90.7 kg carbon fiber bra

Goryan [66]

Answer:

0.921 J/g degrees C

Explanation:

Recall that the First Law of Thermodynamics demands that the total internal energy of an isolated system must remain constant. Any amount of energy lost by the brakes must be gained by the tires (in the form of heat in this situation). Therefore, heat given off by the brakes = −heat taken in by tires, or:

−qbrakes=qtires

The equation used to calculate the quantity of heat energy exchanged in this process is:

−qbrakes=−cbrakes mbrakes ΔTbrakes=ctires mtires ΔTtires=qtires

First we must convert the mass of the tires and the brakes from kg to g.

massbrakes=90.7 kg×1,000. g1 kg=9.07×104 g

masstires=123 kg×1,000. g1 kg=1.23×105 g

Next, substitute in known values and rearrange to solve for ctires. Note that the final temperature for both the tires and the brakes is 172∘C, the initial temperature of the brakes is 312∘C and the initial temperature of the tires is 15∘C.

−(1.400Jg∘C)(9.07×104 g)(172∘C−312∘C)=(ctires)(1.23×105 g)(172∘C−15∘C)

ctires=−(1.400 Jg∘C)(9.07×104 g)(−140∘C)(1.23×105 g)(157∘C)=17,777,200 J19311000 g∘C=0.9206Jg∘C

The answer should have three significant figures, so round to 0.921Jg∘C.

6 0

2 years ago