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GarryVolchara [31]
4 years ago
9

You can scratch graphite with your fingernail. What does this tell you about graphite? A. It breaks easily. B. It’s not very har

d. C. It’s not very lustrous. D. It doesn’t have much texture.
Chemistry
1 answer:
Sergeu [11.5K]4 years ago
7 0

Answer:

A and B

Explanation:

Graphite (like in a pencil) is a material that can easily be smudged and shaded just by smudging it a little. Therefore I believe it's A or B

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A piece of silver releases 202.8 J of heat while cooling 65.0 °C. What is the mass of the sample? Silver has a specific heat of
KiRa [710]

Answer: 13 grams

Explanation:

The quantity of heat energy (Q) released from a heated substance depends on its Mass (M), specific heat capacity (C) and change in temperature (Φ)

Thus, Q = MCΦ

Since,

Q = 202.8 Joules

Mass of silver = ?

C = 0.240 J/g °C.

Φ = 65°C

Then, Q = MCΦ

202.8J = M x 0.240 J/g °C x 65°C

202.8J = M x 15.6 J/g

M = (202.8J / 15.6 J/g)

M = 13 g

Thus, the mass of silver is 13 grams

7 0
3 years ago
What's the most unreactive metal?​
Simora [160]

Answer:

gold and platinum

Explanation:

Very unreactive metals, such as gold and platinum, are found in the Earth's crust as pure metals. These are called native metals.

6 0
3 years ago
a solution containing 80 g of KCL in 200 g of H2O at 50 degrees celcius is cooled to 20 degrees celcius. How many grams of KCL r
Varvara68 [4.7K]

Answer:

12g KCl will be crystallized

Explanation:

To solve this problem you need to know solubility of KCl in water at 20°C is 34g per 100g of water.

That means the maximum concentration of KCl you can dissolve at 20°C in 200g of water is 34g×2 = 68g of KCl

As solution containing 80g of KCl, the extra KCl will be crystallized after cooling, that is:

80g of KCl - 68g of KCl = <em>12g KCl will be crystallized</em>

I hope it helps!

8 0
3 years ago
Why does land heat up more faster than water?
Agata [3.3K]

 if you go to a desert and your in the middle of nowhere you get thirsty and have no water and need to find water to drink so the sun is the reason it heats faster than water in the desert


5 0
3 years ago
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Which of these is a significant limitation of using wind power for energy?
Yuliya22 [10]
The answer is D all of the above because I just got done with this question
7 0
3 years ago
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