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3 years ago

What % of original U238 remains after three half lives? 1-50 2-25 3-12.5 4-6.25

Chemistry

1 answer:

Grace [21]3 years ago

7 0

Answer:

12.5

Explanation:

After three half-lives, one eighth (1/2 x 1/2 x 1/2) of the uranium-238 will remain. One-eighth equals 12.5%

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A student comes to the conclusion that solids are denser than liquids. Is this true? Explain.

SashulF [63]

True, because a liquid can be taken and added, but a solid stay the same never losses and never gains

6 0

4 years ago

Which of the following changes alone would cause a decrease in the value of Keq for the reaction represented above?A) Decreasing

Orlov [11]

Answer:

Explanation:

You did not provide the reaction. However, you should know that only change in temperature affects the value of an equilibrium constant (Keq) by the equation, K=Ae>-RT

5 0

3 years ago

A 1.85 kg textbook is sitting on a bookshelf 2.23 m above the floor. How much potential energy does it have?

neonofarm [45]

Answer:

$\boxed {\boxed {\sf 40.4299 \ Joules}}$

Explanation:

Potential energy is energy due to position. It is the product of mass, height, and acceleration due to gravity.

$PE= m \times g \times h$

The mass of the textbook is 1.85 kilograms. Assuming this is on Earth, the acceleration due to gravity is 9.8 meters per square second. The height is 2.23 meters.

m= 1.85 kg
g= 9.8 m/s²
h= 2.23 m

Substitute the values into the formula.

$PE = 1.85 \ kg \times 9.8 \ m/s^2 \times 2.23 \ m$

Multiply the first 2 numbers together.

$PE=18.13 \ kg*m/s^2 *2.23 \ m$

Multiply again.

$PE= 40.4299 \ kg*m^2/s^2$

1 kilogram square meter per square second (1 kg*m²/s²) is equal to 1 Joules (J)
Our answer of 40.4299 kg*m²/s² is equal to 40.4299 J

$PE= 40.4299 \ J$

The textbook has <u>40.4299 Joules of potential energy.</u>

7 0

3 years ago

Why is the metric system the preferred system of measurement for science

kipiarov [429]

Because science have measurements.

3 0

4 years ago

GalinKa [24]

The bowl of mixed fruits is a mixture because there are several things making up the object. Hence, option (B) is correct.

What is a mixture?

The matter is categorized as mixtures and pure substances.
A mixture is defined as a combination of substances that are not chemically mixed.
A mixture can exist in solid, liquid, or gas form.
A mixture can exist in the same or in a different phase. It can be homogenous or heterogeneous.
If the substances are combined in the same phase, then the mixture is a homogeneous mixture.
But if the substances are combined in different phases, then it is a heterogeneous mixture.

Therefore, the mixed fruit bowl is a mixture, because there are several things making up the object.

Hence, option (B) is correct.

To learn more about mixture, visit: brainly.com/question/12160179

#SPJ9

8 0

2 years ago