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3 years ago

A car traveling with a constant speed travels 150 km in 7200 s. What is the speed of the car?

1 answer:

7 0

Since average speed equals distance divided by time spent, then 7200 should be turned to hours, which is 2 hours. 150/2 = 75, which means that his average speed is 75 km per hour, which is why he goes 150 km in 2 hours.

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A particular solution of NaOH has hydronium concentration of 4x10-9 M. what is the solution’s pH?

bearhunter [10]

Answer:

The pH of the solution is 8, 40-

Explanation:

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pH = -log (H30+)

pH= -log (4x10-9M)

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3 years ago

Riley is doing an experiment working with friction. He wants to find two ways to modify an object that could increase or decreas

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Riley can either change the surface area of the object or can change the slipperiness of the material.

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3 years ago

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The half-life of radium-226 is 1590 years. if a sample contains 100 mg, how many mg will remain after 1000 years?

Katyanochek1 [597]

Answer:

$a=64.7mg$

Explanation:

Hello,

In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:

$a=a_0(\frac{1}{2} )^{\frac{t}{t_{1/2}} }$

Therefore, for an initial amount of 100 mg with a half-life of 1590 years, after 1000 years, we have:

$a=100mg(\frac{1}{2} )^{\frac{1000years}{1590years} }\\\\a=64.7mg$

Best regards.

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3 years ago

Why are elements in the tall columns of the periodic table called

Natalka [10]

The answer is they follow a patter for valence electrons.

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3 years ago

What is the bonding requirement for carbon atoms?

Artyom0805 [142]

Answer:

carbon atoms tend to make four bonds, each carbon atom will have the number of hydrogen atoms that are required for four bonds. This compound contains 16 hydrogen atoms for a molecular formula of C 8 H 16.

Explanation:

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2 years ago