what is going to happen to a balloon filled with helium that is left in a car over night when the temperature drops approximately 20 degrees? (there are no holes in the balloon

The balloon is going to be somewhat deflated due to the decrease in volume. Since volume is directly proportional to temperature.

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The size of the balloon will change as it size will get reduce with decease in temperature.

Explanation:

Charles law states that 'At constant pressure , volume occupied by the gas is directly proportional to the temperature of the gas.

(Constant pressure)

So , when the balloon is left in the car over night where temperature drops to 20 degree Celsius that 293.15 Kelvins the size of the balloon got decreased. This is due to decrease in temperature of the gas with which the volume occupied by the gas also get decrease.

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms

1.solid

2.carbon dioxide

3.helium