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=1.751000 kg/m^3
=1750 kg/m^3
1 kg= 1000 g
1 m^3= 10^6 mL
density of the object=17501000/10^6
= 1.75 g/mL
density= mass/volume
1.75=mass/275
mass= 1.75275
=481.25 g
so the answer is 4) 481.3
10) 1 mg=10^-3 g
250 mg=25010^-3
=0.25
total mass of the drug required=0.52=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= 0.21000=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= 0.251000= 250 mL
mass=1.21 kg
1 kg=1000g
1.21 kg= 1.211000=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)
8. What is the density (g/mL) of a solid with mass of 4.75 g and a...
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