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telo118 [61]
2 years ago
8

How much energy is needed to change the temperature of 50g of water by 15°C?

Chemistry
1 answer:
UNO [17]2 years ago
6 0

Q=mcΔt

Q=50 x 4.186 x 15

Q = 3139.5 J

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A piece of aluminum weighing 10.0 grams is placed into a graduated cylinder that has an initial volume (before immersion) of 35.
padilas [110]

Answer:

The density of the metal sample is 2.70 \frac{grams}{mL}

Explanation:

Density is a magnitude that allows you to measure the amount of mass in a given volume of a substance. Then, the expression for the calculation of density is the ratio between the mass of a body and the volume it occupies:

d=\frac{m}{V}

Density, according to the International System of Units, is usually expressed in kilograms per cubic meter (kg / m3) or gram per cubic centimeter (g / cm3). Although it can also be expressed in any other unit of mass by volume.

So, for the calculation of density you know that:

  • mass of the sample= 10 grams
  • volume of the sample = volume on the cylinder after immersion - volume on the cylinder before immersion= 38.7 mL - 35.0 ml = 3.7 mL

Then:

d=\frac{10 grams}{3.7 mL}

d=2.70 \frac{grams}{mL}

<u><em>The density of the metal sample is 2.70 </em></u>\frac{grams}{mL}<u><em></em></u>

5 0
3 years ago
The first periodic table of elements was created in 1955. True or false
DaniilM [7]
I believe the answer is false
5 0
3 years ago
What causes objects sliding on a surface to stop?
MAXImum [283]

Answer:c

Explanation: becasue if u add to it u get 5 or c

8 0
3 years ago
2 Points
eimsori [14]

Answer:

The answer is option b.

Your weight would decrease.

Hope this helps.

7 0
3 years ago
How much cesium (half-life = 2 years) would remain from a 10 g sample after
Molodets [167]

Answer:

The correct answer is <u><em>A. 59.</em></u>

Explanation:

The formula for finding the amount of radio active substance that remains after decomposition is A = N(1/2) ^y, where A is the mass remaining, N is the original mass of a radioactive sample and y is the number of half life. In this case, N = 10 g and y = 6/2 = 3. So A is given by 10 x (1/2)^3, which is 10 x 1/2 x1/2 x 1/2 = 1.25 grams.

5 0
3 years ago
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