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4 years ago

The range in size of most atomic radii is approximately what?

Chemistry

1 answer:

Nastasia [14]4 years ago

3 0

It is approximately 10 ^ -10

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Scientists classify rocks into three different types. What is the main for basis for the classification system they chose?

dangina [55]

Rocks are classified as igneous, sedimentary or metamorphic.

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3 years ago

"how many fold difference is the hydrogen ion concentration if the ph is 6.7 is increased to 8.7"

Nina [5.8K]

pH of the solution is calculated using the following formula:

$pH=-log{[H^{+}]}$

Here, $[H^{+}]$ is concentration of hydrogen ion.

Initial value of pH is 6.7, calculate concentration of hydrogen ion from this as follows:

$[H^{+}]=10^{-pH}$

Putting the value,

$[H^{+}]=10^{-6.7}=1.9952\times 10^{-7}$

Thus, initial concentration of hydrogen ion is $1.9952\times 10^{-7}$ .

Now, final pH value is 8.7, calculate concentration of hydrogen ion as follows:

$[H^{+}]=10^{-8.7}=1.9952\times 10^{-9}$

Thus, final concentration of hydrogen ion is $1.9952\times 10^{-9}$ .

The ratio of final to initial value will be:

$\frac{1.9952\times 10^{-9}}{1.9952\times 10^{-7}}=\frac{1}{100}$

Thus, if pH increases from 6.7 to 8.7, concentration of hydrogen ion becomes $\frac{1}{100}$ of the initial value.

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3 years ago

I need help with 32-34 please!

Ludmilka [50]

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3 years ago

A car is traveling at 87.0 km/hr. How many meters will it travel in 37.0 seconds?

Alenkasestr [34]

Speed of the car = $87.0 \frac{km}{hr}$

Given time = 37.0 s

Converting time from seconds to hours:

1 hr= 60 min; 1 min = 60 s

$37.0 s * \frac{1 min}{60s}*\frac{1 hr}{60min} = 0.0103 hr$

Calculating distance from speed and time:

$0.0103 hr * \frac{87.0 km}{1 hr} =0.894 km$

Converting distance from km to m:

$0.894 km * \frac{1000 m}{1 km} = 894 m$

So the distance traveled by the car in 37.0 s is 894 m.

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3 years ago

Which statement is true if the Delta.Hrxn of a reaction is positive? The reaction is endothermic. The reaction is exothermic. Th

KatRina [158]

Answer:

The reaction is endothermic.

Explanation:

Heat is absorbed in endothermic reactions. An endothermic process is any process which requires or absorbs energy from its surroundings, usually in the form of heat. It may be a chemical process, such as dissolving ammonium nitrate in water, or a physical process, such as the melting of ice cubes (wikipedia)

Standard Enthalpy of Reaction (ΔHrxn) is the amount of heat absorbed (+ΔH value) or released (-ΔH value) that results from a chemical reaction.

3 0

3 years ago

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