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Alecsey [184]
2 years ago
13

What is the mass of one gram of calcium?

Chemistry
1 answer:
Anvisha [2.4K]2 years ago
8 0

pls follow me

Explanation:

The mass of one atom of calcium is the same as the molar mass of the calcium. Also, the atomic mass of calcium is 40.078 g/mol.

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The acceleration of a sprinter is 10 m/s2. The force exerted on the starting blocks is 650 N. What is the mass of the sprinter?
jek_recluse [69]

The relation between force, mass of an object and its acceleration is given by following equation

F = mass of object X acceleration

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unit of acceleration is ms⁻²

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Mass of object =\frac{Force}{acceleration}

mass of sprinter =\frac{650}{10}=65kg

5 0
3 years ago
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How could you distinguish octane from 1-octene by a simple<br> chemical test?
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As the name indicate that in 1-octene there is a double bond on the first position in the eight carbon atoms chain THUS to detect its presence, we use bromine water test;

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What amount of energy is required to change a spherical drop of water with a diameter of 1.80 mm to three smaller spherical drop
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This is a straightforward question related to the surface energy of the droplet. 

<span>You know the surface area of a sphere is 4π r² and its volume is (4/3) π r³. </span>

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<span>The total surface energy of the original droplet is 0.00000616 * 72 ~ 0.00044 mJ </span>

<span>The five smaller droplets need to have the same volume as the original. Therefore </span>

<span>5 V = 1.438 mm³ so the volume of one of the smaller spheres is 1.438/5 = 0.287 mm³. </span>

<span>Since this smaller volume still has the volume (4/3) π r³ then r = cube_root(0.287/(4/3) π) = cube_root(4.39) = 0.4 mm. </span>

<span>Each of the smaller droplets has a surface area of 4π r² = 2 mm² or 0.0000002 m². </span>

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<span>From this radius the surface energy of all smaller droplets is 0.00072 and the difference in energy is 0.00072- 0.00044 mJ = 0.00028 mJ. </span>

<span>Therefore you need roughly 0.00028 mJ or 0.28 µJ of energy to change a spherical droplet of water of diameter 1.4 mm into 5 identical smaller droplets. </span>
7 0
3 years ago
How many electrons are orbit the nucleus of an atom with an atomic number of 60?​
Sergio039 [100]
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7 0
2 years ago
2. Just like the N and S poles on bar
maksim [4K]

Answer:

A) attract

Explanation:

hope it helps you

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