Question

8. What is the density (g/mL) of a solid with mass of 4.75 g and a volume of 6.20 mL (10pts)? (1) 1.31 (2) 0.95 (3) 0.77 (4) 1.25 9. What is the mass (g) of a 275 ml solid with a specific gravity of 1.75 (10pts)? (1) 541.2 (3) 157.1 (2) 256.7 (4) 481.3 10. A patient needs 0.5 grams of medication two times per day. How many 250 mg tablets must he take per day (10pts)? (1) (3) 4 (2) 6 (4) none of above 11. How much time is required to administer 0.2 L of glucose IV solution if the flow rate is SmL/min (10pts)? (1) 5 hours (3) 50 minutes (2) 0.5 days (4) none of above 12. What is the volume (mL) of a 200g liquid with a density of 2 g/mL (10pts)? (1) 100 ml (2) 50 ml (3) 400 ml (4) none of above 13. A titanium bicycle frame displaces 0.250 L of water and has a mass of 1.21kg. What is the density of the titanium (10pts)? (1) 2.07 lb/L (3) 4.84 lb/L (2) 2.07 g/mL (4) 4.84 g/mL 14. A process gives off heat is (10pts): (1) endothermic (2) exothermic (3) heterothermic (4) metrothermic 15. An anion is formed when a neutral atom (10pts): (1) gains proton (2) loses proton (3) loses electron (4) gains electron

Answer 1

8) density= mass/volume

mass= 4.75 g

volume= 6.20 mL

density= 4.75/6.2

= 0.77 g/mL

so the answer is 3) 0.77

9) specific gravity= density of the object/density of water

1.75= density of the object/1000 kg/m^3

density of the object=1.75$\times$1000 kg/m^3

=1750 kg/m^3

1 kg= 1000 g

1 m^3= 10^6 mL

density of the object=1750$\times$1000/10^6

= 1.75 g/mL

density= mass/volume

1.75=mass/275

mass= 1.75$\times$275

=481.25 g

so the answer is 4) 481.3

10) 1 mg=10^-3 g

250 mg=250$\times$10^-3

=0.25

total mass of the drug required=0.5$\times$2=1 g ( 0.5 g drug has to be taken twice)

number of 0.25 g tablets has to be taken= 1/0.25=4

so the answer is 3) 4

11) volume= 0.2 L

1 L= 1000 mL

0.2 L= 0.2$\times$1000=200 mL

rate = 5 mL/min

so time taken= volume/speed

= 200 mL/5mL/min

= 40 min

so the answer is 4) none of the above.

12) density= 2g/mL

mass= 200 g

density= mass/volume

2 g/mL= 200/volume

volume= mass/density

=200/2

= 100 mL

so the answer is 1) 100 mL

13) volume displaces is its volume

volume=0.250 L= 0.25$\times$1000= 250 mL

mass=1.21 kg

1 kg=1000g

1.21 kg= 1.21$\times$1000=1210 g

density= mass/volume

=1210/250

= 4.84 g/mL

so the answer is d) 4.84 g/mL

14) exothermic reaction releases heat, and endothermic reactions requires heat energy so the answer is 2) exothermic

15) anion is negatively charged. electrons are negatively charged, anion is formed when a neutral atom gains electrons and positively charged ion is formed when neutral atom loses electron so the answer is 4) gains electrons.

( proton is positively charged)