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umka21 [38]
4 years ago
9

ANALYZE A ball of clay is manipulated into different shapes in each of the images

Chemistry
1 answer:
alekssr [168]4 years ago
7 0

Answer:

The amount of mass and matter in all the transformations of the clay ball will remain the same or constant

Explanation:

From the  law of conservation of mass we have, for an enclosed system to and from which there is no transfer of matter or energy, mass cannot be created nor destroyed, and remains constant at the given value, but the matter which make up the mass can be changed into different forms

Therefore, the clay ball can be transformed into different shapes and will still posses the same initial mass before the transformation, provided there are no transfer of matter or energy from the clay ball system.

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A 3.689 g object is added to 7.29 mL of water causing The water level to rise to 8.54 ML. What is the density of the object? Rou
Marina CMI [18]

Answer:

2.95 g / mL

Explanation:

For this problem, we will simply use the equation that density is equivalent to mass over volume.  We are given the mass of the object and the initial and final volumes of water in the cylinder.  Thus we can find the density as such:

Density = Mass / ( Final Volume - Initial Volume )

Density = 3.689 g / ( 8.54 mL - 7.29 mL )

Density = 3.689 g / ( 1.25 mL )

Density = 2.9512 g / mL

Hence, the density of the object is 2.9512 g / mL.

Cheers.

7 0
4 years ago
Iodine-131, t1/2 = 8.0 days, is used in the diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-
SashulF [63]

Answer:

32,0 days.

Explanation:

The radioactive decay follows:

N_{t} = N_{0}e^{\frac{-0.693t}{t_{1/2}}

Where Nt is the concentration in a time t (6,22x10¹⁷), N₀ is the initial concentration (9,95x10¹⁸) Half life time is 8,0 days and t is the time it take to drop this concentration. Replacing:

6.22x10^{17} = 9,95x10^{18}e^{\frac{-0.693t}{8 days}

0,0625 = e^{\frac{-0.693t}{8days}

ln 0,0625 = {\frac{-0.693t}{8days}

-2,77*8days = -0.693t

-22,2days = -0.693t

32,0days = t

It take <em>32,0 days</em>

<em></em>

I hope it helps!

7 0
3 years ago
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The answer is 151.206g
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What will you expect from an endothermic reaction
Lera25 [3.4K]
An endothermic reaction is when the energy is absorbed, while an exothermic reaction releases energy.
3 0
3 years ago
How many molecules of 3Cu20 are present?
7nadin3 [17]

Answer: 5

Explanation:

6 0
3 years ago
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