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timurjin [86]
3 years ago
8

An object has a mass of 15.2 g and a volume of 8.9 mL. What is the density of the object?

Chemistry
1 answer:
Murljashka [212]3 years ago
8 0

Answer:

recordando también que ** 1mL = 1cm ^ 3 **

(como ** 1 dm ^ 3 = 1 L **)

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A system of ideas that explains many related observations and is supported by a large body of evidence collected through scienti
wlad13 [49]
B. Theory
The hypothesis that stand the test of time (often tested and never rejected) is called theory. A theory is supported by a great dealcof evidence.
6 0
3 years ago
a gas in a container with a fixed volume was originally at a pressure of 317kpa and a temperature of 154k. what is the new press
goldfiish [28.3K]
<h2>Hello!</h2>

The answer is: 4.77atm

<h2>Why?</h2>

Since there's a fixed volume, we can use the the Gay-Lussac's Law which stablish a relation between the pressure and the temperature:

\frac{P}{T}=k

<em>P</em> is the volume of the gas

<em>t</em> is the temperature of the gas

<em>k </em>is the proportionality constant

We also have the following equation:

\frac{P1}{T1}=\frac{P2}{T2}

Where:

P2=\frac{P1*T2}{T1}=\frac{317kPa*235K}{154K}=483.73kPa

We are asked to find the pressure in atm, so we must convert 483.73kPa to atm:

1kPa=0.009869atm

Then,

483.733kPa*\frac{0.009869atm}{1kPa}=4.77atm

Have a nice day!

8 0
3 years ago
After 20 min, a reactant has decomposed to 85 % of its original concentration. Which order would the reaction need to be to allo
rjkz [21]

Answer : The value of rate constant is, 0.0949\text{ min}^{-1}

Explanation :

First we have to calculate the rate constant, we use the formula :

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

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

where,

k = rate constant  = ?

t = time passed by the sample  = 20 min

a = let initial amount of the reactant  = 100 g

a - x = amount left after decay process = 100 - 85 = 15 g

Now put all the given values in above equation, we get

k=\frac{2.303}{20}\log\frac{100}{15}

k=0.0949\text{ min}^{-1}

Therefore, the value of rate constant is, 0.0949\text{ min}^{-1}

7 0
3 years ago
One city is located north of the equator and experiences average rainfall and warm temperatures. Another city is located exactly
9966 [12]

Answer:

It depends.

Explanation:

Generally, the presence of more landmasses in the Northern Hemisphere produces continental climates with extreme temperatures that are relatively rare in the Southern Hemisphere due to the abundance of oceans at the southern latitudes north of Antarctica.

If a city has average rainfall and warm temperatures in the Northern Hemisphere, it is logical to assume that, on average, a city at the same distance from the equator in the Southern Hemisphere would have slightly cooler temperatures and more rainfall due to the enhanced maritime effect.

This depends, of course, entirely on the local geography of the city in question, and the results could be completely different based on the actual city given.

8 0
3 years ago
In this section, include a summary of how your Rube Goldberg device design works from start to finish to complete a task. Your R
anyanavicka [17]

The energy conversions in the Rude Goldberg device design is as follows:

  • a quartz falls off from the roof: potential to kinetic
  • the quartz hits and lift a soda bottle: kinetic to potential
  • The soda bottle moves hits a battery: potential to kinetic
  • a battery which slides along into a torch that lights up: chemical to light

<h3>What is a Rube Goldberg device?</h3>

A Rube Goldberg device uses a set of reactions that work in succession with one event triggering the next event in the form of a chain reaction until the final event is completed.

The Rude Goldberg device design is as follows:

The design is of a unit that produces light when a quartz falls off from the roof. It then hits a plastic soda bottle and its velocity is converted into potential energy used to lift a soda bottle. The soda bottle then on rising hits a battery which slides along into a torch which then light up.

In conclusion, Rude Goldberg devices shows various forms of energy conversion.

Learn more about Rude Goldberg Device at: brainly.com/question/10892506

#SPJ1

6 0
2 years ago
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