تجــــــمع chemistry110

[just besh]

وهذي الاسئلة بصراحه ماعرفت الحل حقتها ياليت توضوحولي ياها بالنسبه للاخت اللي تقول نجمع الاسس ونطرح الاسس وقيمة مطلقه ايش قصدها ياليت تشرحوا مع الامثله اعرف كثرت عليكم استحملوني شوي

2. The diameter of an atom is approximately 1 × 10-7 mm. What is this diameter when expressed in nanometers?
a) 1 × 10-18 nm
b) 1 × 10-15 nm
c) 1 × 10-9 nm
d) 1 × 10-1 nm


3. 6.0 km is how many micrometers?
a) 6.0 × 106 μm
b) 1.7 × 10-7 μm
c) 6.0 × 109 μm
d) 1.7 × 10-4 μm

5. Which of these quantities represents the largest mass?
a) 2.0 × 102 mg
b) 0.0010 kg
c) 1.0 × 105μg
d) 2.0 × 102 cg

6. How many cubic centimeters are there in exactly one cubic meter?
a) 1 × 10-6 cm3
b) 1 × 10-3 cm3
c) 1 × 10-2 cm3
d) 1 × 106 cm3

10. Which of the following prefixes means 1/1000?
a) kilo
b) deci
c) centi
d) milli

14. Which of the following is the smallest distance?
a) 21 m
b) 2.1 x 102 cm
c) 21 mm
d) 2.1 x 104 pm

16. What temperature is 37 °C when converted to kelvin?
a) 310.15
b) 99 k
c) 236 k
d) 67.15

18. Express 75 Tg as pg
a) 0.75pg
b) 75 X1024pg
c) 0.75 pg
d) 75 X10-24 pg

20. Which of these quantities represents the smallest mass?
a) 2.0 × 102 mg
b) 0.0010 kg
c) 1× 105μg
d) 2.0 × 102 cg

21. Express 7.5 ng as Tg
a) 7.5 X10
-21
Tg
b) 75 X10
24
Tg
c) 0.75 Tg
d) 7.5 X10
21
Tg


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