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4 years ago

A solid ice cube absorbs 151.7 J of energy as it warms from 0.00°C to 4.70°C. What is the mass of the ice cube?

Chemistry

1 answer:

chubhunter [2.5K]4 years ago

5 0

I believe you do 151.7= 4.18x (4.70) because you use the formula q=mcat

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Nuclear power plants produce a waste product of cesium-137, which has a half-life of 30 years. how long would it take for the ce

artcher [175]

$m(final)=m(initial)*( \frac{1}{2} )^{ \frac{time}{half-life} 

m(final)= (1/8) *m(initial)

$

$\frac{1}{8} m(initial)=m(initial)*( \frac{1}{2})^{ \frac{time}{halg-life} } 
$

$\frac{1}{8} = \left( \frac{1}{2} \right)^{\frac{time}{30} }

$

$( \frac{1}{2})^{3}= (\frac{1}{2} )^{ \frac{time}{30}}
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7 0

4 years ago

If the solubility of a gas is 7.5 g/L at 404 kPa pressure, what is the solubility of the gas when the pressure is 202 kPa? Show

PIT_PIT [208]

Data:

C1 (initial concentration) = 7.5 g/L
P1 (initial pressure) = 404 kPa
C2 (final concentration) = ? (g/L)
P2 (final pressure) = 202 kPa

We apply the data to the formula of the solubility of gases in a liquid (Henry's Law), let us see:

$\boxed{ \dfrac{C_1}{P_1} = \dfrac{C_2}{P_2}}$

Solving:

$\dfrac{7.5}{404} = \dfrac{C_2}{202}$

$404*C_2 = 7.5*202$

$404C_2 = 1515$

$C_2 = \dfrac{1515}{404}$

$\boxed{\boxed{C_2 = 3,75\:g/L}}\end{array}}\qquad\checkmark$

I hope this helps. =)

3 0

3 years ago

Drag each item to indicate whether it is related to Aristotle's or Ptolemy's model of the solar system, or to both. Some items m

Romashka-Z-Leto [24]

Answer:

Aristotle's Model :

geocentric

planets fixed on nested spheres

Ptolemy's model:

geocentric

planets fixed on epicycles

accurately predicted the positions of the planets

Explanation:

Let's begin by the fact both models are geocentric and make a brief explanation of them:

Aristotle's Model :

Aristotle built his model based on observations and philosophical assumptions, not on measurements or calculations, then he mistakenly thought the Earth was the center of the universe.

So, according to this model, the universe was spherical and finite, with the Earth immobile at its center, composed of the four fundamental elements (made up of spherical layers): ground, water, air and fire; and the Sun along with the fixed planets in their respective concentric spheres (also called nested spheres) revolving around the Earth.

Ptolemy's model:

Ptolemy's model of the universe was also geocentric, placing the Earth motionless in the center of the known universe and was the accepted model for a long time during the Middle Ages.

In this sense, ccording to Ptolemy's model of the universe our planet remains stationary while the other planets, the Moon and the Sun describe complicated orbits around it (called epicycles).

However, this model predicted with an acceptable accuracy for that time the motion of the known planets, until Copernicus appeared with the revolutionary Heliocentric model.

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3 years ago

The sun melts a popsicle. is what type pf transfer

denis23 [38]

Answer:

heat?

Explanation:

the sun warms the popsicle, therefore melting th popsicle.

sry if this is wrong

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3 years ago

What is the mass of 2M H2SO4 in a 50ml of solution

Cloud [144]

Answer:

It is given in the question that molarity of the sulphuric acid is 2M, the volume of the sulphuric acid is 20 mL, the volume of the solution is 1`L.

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3 years ago