Ch1
°F to °C
(°F-32)/1.8
What temperature is 77 K when converted to degrees Celsius?
-196C
Ammonia boils at -33.4C. What temperature is this in F?
-28.1 F
At what temperature does the numerical reading on a Fahrenheit thermometer equal that on a Celsius thermometer?
-40F Explanation: since the temperature reading is the same so that mean °F = °C ? F = [°C × 9/5 ] + 32 °F Let temperature = t t = [t × 9/5 ] + 32 °F t - 9/5 t = 32 °F -4/5 t = 32 °F t = - 40 °F = -40 °C
is the freezing point of water = 273 °K = 32 °F
0 °C
The diameter of an atom is approximately 1 x 10-7 mm. What is this diameter when expressed in nanometers?
1 x10-1 nm
There are three temperature scales, their units are
1) Degrees Celsius °C 2) Degrees Fahrenheit °F 3) Kelvin °K
is the boiling point of water = 373 °K = 212 °F
100 °C
Deci
10^-1
Pico
10^-12
Femto
10^-15
atto
10^-18
centi
10^-2
milli
10^-3
micro
10^-6
nano
10^-9
Tera
10^12 (trillion)
The SI prefixes Tara and nano represent, respectively:
10^12 and 10^-9
Peta
10^15 (P)
kilo
10^3 (1000)
mega
10^6 (1,000,000)
Giga
10^9 (billion)
The SI prefix giga and micro represented by
10^9 and 10^-6
The SI prefixes giga and micro represent, respectively
10^9 and 10^-6.
1 pico meter =_____________centimeter
1x10^-12+2=10^-10
1 nanometer=____________picometers
1x10^-9+12=1000
1 kilogram =_____________miligrams
1x10^3+3=10^6
How many cubic centimeters are there in exactly one cubic meter?
1x10^6 cm3
How many meters in 2.3 nm?
2.3 x 10^-9
How many mm in 2.3 m?
2.3 x 10^3
Convert -77F to kalvin ?
212.6K
Choose the smallest value of the following a-0.1 kg b-200 g c-2X 10-3 μg
2X 10-3 μg
What temperature is 37 °C when converted to kelvin.
310.15
The freezing point of water at 1 atm pressure is...
32 °F
What temperature is 95 °F when converted to degrees Celsius?
35c
The number 0.0005678 expressed in scientific notation is:
5.678 x 10-4 Explanation: Since this number is less than one star moving the decimal point to the right until there is ONE non- zero number to the left of the decimal point. Write the rest of the number as is. Write the exponent as the number of places the decimal point was moved.
Express 500 cm into GM
500x10^-2-9
6.0 km is how many micrometers?
6.0x10^9 μm
Express 7.5 ng as Tg
7.5 x 10^-21 Tg
Iron has a density of 7.9 g/cm3. What is the mass of a cube of iron with the length of one side equal to 55.0 mm? a-2.1×104 g b-4.3×102 g c-1.3×103 g d-1.4g
7.9 g/cm3 × 166.375 cm3
Express 75 Tg as pg
75 X1024 pg
80 °F is equivalent to......
80-32/1.8= 26.67 °C
Which of these quantities represents the smallest mass? A)2.0 x 102 mg B) 0.0010 kg C) 1x10^5ug D)2.0 x 10^ 2 cg
A)2.0 x 102 mg B) 0.0010 kg C) 1x10^5ug✅ D)2.0 x 10^ 2 cg
The S I unit of electric current is
Ampere
K - 273.15°
C =
Which of the following SI base units is not commonly used in chemistry?
Candela
is the amount of matter in agiven amount of space
Density (d) :
If the temperature is 25°C, what is the temperature in Fahrenheit
F=(1.8xc)+32 =77F
A temperature of ________° K is the same as 63 °F.
First 63-32/1.8=17.22c Second k=c+273.15=290k
unitofdensity for solid
G/Cubic centimeter
unitofdensity For gases
G/l
unitofdensity for liquid
G/ml
What is the density of a piece of wood that has a mass of 20 g and a volume of 2 cm3? a-9.45 g/cm3 b-10.00 g/cm3 c-19.45 g/cm3 d-40.00 g/cm3
H
°C + 273.15°
K =
is the SI Base Unit of Temperature
Kelvin
SI unit of temperature
Kelvin (K)
Which of the following prefixes means 1000?
Kilo
What is the abbreviation for the prefix mega
M
Density is equals to
Mass divided by volume
Which of the following is length si unit
Meter
The following prefix 10^-3 means
Milli
Which of the following prefixes means 1/1000?
Milli
SI derived unit of pressure
Pascal
The SI base unit of time is the
Second
The SI unit of time is the
Second
Density of gases are
Very low
Which of these quantities represents the largest mass? a) 2.0 x10^2 mg b) 0.0010 kg c) 1.0 x10^5 ug d) 2.0 x 10^2 cg
a) 2.0 x10^2 mg b) 0.0010 kg c) 1.0 x10^5 ug d) 2.0 x 10^2 cg✅
Which of the following is the smallest distance? a) 21m b) 2.1 x 102 cm c) 21 mm d) 2.1 x 104 pm
a) 21m b) 2.1 x 102 cm c) 21 mm d) 2.1 x 104 pm✅ Explanation: Even though 2.1 x 104 is the largest number in this question, the units of pm (picometers) are the smallest units here, making it the smallest distance
Which of the following is not an SI base unit? a) Kilometer b) Kilogram c) Second d) Kelvin
a) Kilometer ✅ b) Kilogram c) Second d) Kelvin
4) Choose the largest value of the following a-0.1 kg b-200 g c-2X 10-3 μg d-3 X 109 ng
a- 0.1 kg × 103 = 100 g b- 200 g ✅ c- 2 × 10-3 μg × 10-6 = 2 × 10-9 g d- 3 × 10-9 ng × 109 = 3 g
All of the following is considered an si base unit except
a-Kg. b-meter c-second ((D-celsius ))
The SI unit of volume is
cubic meter
Which of the following is not SI base unit?
gram
SI derived unit for density
kg/m^3
Density decreases with
temperature
[ 1.8 × °C] + 32°
°F =