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3 years ago

What term describes the time it takes for the amount of radioactivity in a material to decrease by one half

Chemistry

1 answer:

den301095 [7]3 years ago

6 0

Half-life (period)
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How many grams of aluminum are in 0.58 moles of Al2O3.2H:0?

Pani-rosa [81]

Answer:

80.04 gram

Explanation:

mass = moles × relative formula mass

= 0.58×138

= 80.04

4 0

4 years ago

Current passes through a solution of sodium chloride. In 1.00 second, 2.68×1016Na+ ions arrive at the negative electrode and 3.9

EleoNora [17]

Answer : The current passing between the electrodes is, $1.056\times 10^{-2}A$

Explanation :

First we have to calculate the charge of sodium ion.

$q=ne$

where,

q = charge of sodium ion

n = number of sodium ion = $2.68\times 10^{16}$

e = charge on electron = $1.6\times 10^{-19}C$

Now put all the given values in the above formula, we get:

$q=(2.68\times 10^{16})\times (1.6\times 10^{-19}C)=4.288\times 10^{-3}C$

Now we have to calculate the charge of chlorine ion.

$q'=ne$

where,

q' = charge of chlorine ion

n = number of chlorine ion = $3.92\times 10^{16}$

e = charge on electron = $1.6\times 10^{-19}C$

Now put all the given values in the above formula, we get:

$q'=(3.92\times 10^{16})\times (1.6\times 10^{-19}C)=6.272\times 10^{-3}C$

Now we have to calculate the current passing between the electrodes.

$I=\frac{q}{t}+\frac{q'}{t}$

$I=\frac{4.288\times 10^{-3}}{1.00}+\frac{6.272\times 10^{-3}}{1.00}$

$I=1.056\times 10^{-2}A$

Thus, the current passing between the electrodes is, $1.056\times 10^{-2}A$

4 0

3 years ago

In crystal of an ionic compound, the cations are surrounded by anions so that the charges of the ions are balanced true or false

grandymaker [24]

True

Explanation:

In the crystal of an ionic compound, the cations are surrounded by anions so that the charges of the ions are balanced. This very correct.

Ionic compounds are electrically neutral and forms by a charge balance.

To form an ionic crystal, the charges overall must be balanced and the compound must remain electrically neutral.
Equal number of charges on the metal and non-metal must cancel out to establish an electrostatic force.

learn more:

Ionic compound brainly.com/question/6071838

#learnwithBrainly

7 0

3 years ago

n element has FOUR known isotopes with the following atomic masses and percentage of occurrence: 47.688 amu; 15.778% 44.000 amu;

mixer [17]

Have a gooood dayyyyy

7 0

3 years ago

When a warm air mass and a cold air mass meet, but they push at each other and neither one can move, it is called a/an

Sergio039 [100]

When a warm air mass and a cold air mass meet and cant move its called "stationary front"

7 0

4 years ago