Atypical person has an average heart rate of 75.0 beats/min. calculate the following a)how many beats does she have in 7.0 years? b) how many beats in 7.000 years? pay close attention to significant figures in this question.

a) Beats in 7.0 years =

b) Beats in 7.000 yrs=

Explanation:

Step 1

Calculation of no. of min. in 7 year

Days in a year = 365

Hrs in a day = 24

Min. in a 1 hr = 60

Min. in a day = 60 × 24

Min. in a year = 60 × 24 × 365

Min. in 7 years

               = 60 × 24 × 365 × 7

               = 3679200 min.

a) Beats in 7.0 years

Heart rate = 75.0 beats/min.

Beats in 7.0 yrs

             = 75.0 × 3679200

             = 275940000 beats

No. of significant figure = 2

Answer has to be reported in 2 significant digits.

Beats in 7.0 years =

a) Beats in 7.000 years

Beats in 7.000 yrs = 275940000 beats

No. of significant figure in 7.000 = 4

Answer has to be reported in 4 significant figures

So, no. of beats in 7.000 yrs=

- 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