Worth 12 points !
match the similarities between an electrical circuit and water circuit.
1. psi a. battery
2. pipes b. open circuit
3. pump c. ammeter
4. valve d. switch
5. restriction e. amps
6. water meter f. resistance
7. water g. + voltage
8. high pressure output h. - voltage
9. low pressure intake i. closed circuit
10. valve closed j. electrons
11. valve open k. volts
12. liters/second l. conductors

PSI=volts

pipes=conductors

pump=battery

valve=switch

restriction=resistance

water meter=ammeter

water=electrons

high pressure output= + voltage

low pressure intake= -voltage

valve closed=open circuit

valve open=closed circuit

liters/second=amps

- 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

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.