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3 years ago

Which is the most reactive metal and why?

Chemistry

1 answer:

Gemiola [76]3 years ago

3 0

Answer:

Caesium, the most reactive metal in the periodic table, reacts extremely violently – hence why it can't be demonstrated in a classroom! This can be compared to other common metals, such as iron and copper, which produce no reaction when dropped into water.

Hope this answer is right!

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The air molecules get knocked away and take some of the kinetic energy away from the object, which makes the object slow down

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3 years ago

Why does the lack of snow in the mountains make drought cycles worse

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3 years ago

28. How many formula units are found in 0.250 moles of potassium nitrate?

Soloha48 [4]

Answer:

$\boxed {\boxed {\sf B. \ 1.5 *10^{23} \ formula \ units}}$

Explanation:

1 mole of any substance contains the same number of particles. The particles can vary (atoms, molecules, formula units), but there are always 6.022*10²³ particles. In this case, the particles are formula units of potassium nitrate or KNO₃.

Let's create a ratio.

$\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}$

Since we are trying to find the formula units in 0.250 moles, we multiply by that number.

$0.250 \ mol \ KNO_3 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 \ mol \ KNO_3}$

The units of moles of potassium nitrate cancel.

$0.250 *\frac {6.022*10^{23} \ formula \ units \ KNO_3}{1 }$

The denominator of 1 can be ignored, so we can make a simple multiplication problem.

$0.250 *{6.022*10^{23} \ formula \ units \ KNO_3}$

$1.5055 * 10^{23} \ formula \ units \ KNO_3$

If we round to the nearest tenth, the 0 in the hundredth place tells us to leave the 5 in the tenth place.

$1.5 *10^{23} \ formula \ units \ KNO_3$

0.250 moles of potassium nitrate is approximately equal to 1.5*10²³ formula units of potassium nitrate and choice B is correct.

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3 years ago

Which is the most reactive metal and why?​

Which is the most reactive metal and why?