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algol [13]
3 years ago
15

How many total elements are in marble?

Chemistry
1 answer:
Dahasolnce [82]3 years ago
4 0

Answer:There are total 118 elements in world as about marbale

Explanation:

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The periodic table shows that a carbon atom has six protons. This means that a carbon atom also has...
harkovskaia [24]
6 electrons in its shell
5 0
3 years ago
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He distance from Earth to the North Star is about 430 light-years. Which of the following statements describes why scientists us
garri49 [273]

Answer:

D

Explanation:

because the rest don’t make any sense

8 0
3 years ago
A 12 gram piece of Cu at 475 oC is placed in contact with a 15 gram piece of Cr at 265 oC.
ale4655 [162]

Answer:

349.22°C

Explanation:

Let the final temperature of the two pieces of metal be x.

Now, the warmer metal which is C u reduces from 475°C to x. Thus Δt for C u is; Δt1 = 475 - x.

The cooler metal Cr increases in temperature from 265°C to x. Thus, it's change in temperature is Δt for Cr is; Δt2 = x - 265.

Now from conservation of energy, the amount of energy leaving the C u metal is equal to the amount of energy entering the Cr metal.

Thus;

q_lost = q_gain

Where;

q_lost = m1•c1•Δt1

q_gained = m2•c2•Δt2

Now, c1 & c2 are the specific heat capacity of C u and Cr respectively.

From online tables, c1 = 0.385 J/g°C and c2 = 0.46 J/g°C

We are given;

m1 = 12g and m2 = 15g

Thus;

12 × 0.385 × (475 - x) = 15 × 0.46 × (x - 265)

2194.5 - 4.62x = 6.9x - 1828.5

6.9x + 4.62x = 2194.5 + 1828.5

11.52x = 4023

x = 4023/11.52

x = 349.22°C

4 0
3 years ago
The speed of light is 3.00×108m/s. How long does it take for light to travel from Earth to the Moon and back again?
grandymaker [24]
The variable we have to determine for this problem is the time. Since the given information is speed, we have to know the distance so that we can solve for the time. From literature, the distance between the Earth and the moon is 384,400,000 meters. Therefore,

Speed = Distance/Time
Time = Distance/Speed
Time = 384,400,000 m/ 3×10⁸ m/s = 1.28 seconds
7 0
3 years ago
URGENT PLZ HELP AHHHHHHH
dexar [7]

A, B, and D. You already answered the first one, so I wouldn't think this would be too hard

:)

8 0
3 years ago
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