You are driving home from school steadily at 98 km/h for 150 km. It then begins to rain and you slow to 64 km/h. You arrive home after driving 2 hours and 20 minutes. How far is your hometown from school?
A chemist did an extraction to isolate 1.0g of a compound (mp 75-77 °C), and after isolating the compound, the chemist found that the sample weighed 1.1g, and its melting range was 65-69°C. Why?
A chemist did an extraction to isolate 1.0g of a compound (mp 75-77 °C), and after isolating thecompound, the chemist found that the sample weighed 1.1g, and its melting range was 6569°C. Why?…
An organic cereal has a serving size of 1 cup. Each serving contains 3 grams of fat, 19 grams of digestible carbohydrates, and 6 grams of protein. How many calories would be contained in 2 servings of that cereal?
Rank the solutions of the acids in the table in order of increasing pH (lowest pH first)
A) acetic acid, formic acid, hypobromous acid, phenol
B) hypobromous acid, phenol, acetic acid, formic acid
C) phenol, hypobromous acid, acetic acid, formic acid
D) formic acid, acetic acid, hypobromous acid, phenol
E) phenol, acetic acid, hypobromous acid, formic acid
Using the rules of significant figures, calculate the following:
2.7721
2.8
2.77
3
2.772
Convert 1903.8 g to mg.
1.9038×103 mg
19.038 mg
190.38 mg
1.9038×106 mg
1.9038 mg
What is the mass of lead in a bar that measures 3.0 cm by 5.0 cm by 20.0 cm? (The density of lead is 11.3 g/cm3 at 20°C.)
3400. g
26.5 g
3390 g
3.4×103 g
300 g
The pressure of the earth’s atmosphere at sea level is 14.7 lb/in2. What is the pressure when expressed in kg/m2? (2.54 cm = 1 in., 2.205 lb = 1 kg)
5.02×104 kg/m2
2.09×10-2 g/m2
4.30×10-3 kg/m2
1.03×104 kg/m2
2.62×102 kg/m2
5.8 g of water ice at 270 K is mixed with 181 g of liquid water at 316.7 K in an insulated container under an external pressure of 1.00 bar. Answer the following questions assuming that the physical properties of water and ice are constant over the range of interest. Physical properties for water and ice are given below:
Cp,m,ice = 1.95 J g-1 K-1
ΔHfusion,ice = 333.4 J g-1
Cp,m,water = 4.18 J g-1 K-1
Melting point of ice: 273.15 K
m
q
The spectrometer consists of two regions as shown in the figure.() In the first region an electric field accelerates the ion and in the second the ion follows a circular arc in a magnetic field. The radius of curvature of the arc can be measured and then the m/q
ratio can be found.
After being accelerated to a speed of 1.09×105 m/s
, the particle enters a uniform magnetic field of strength 0.900 T
and travels in a circle of radius 31.0 cm
(determined by observing where it hits the screen as shown in the figure). The results of this experiment allow one to find m/q
.
Find the ratio m/q
for this particle.
Express your answer numerically in kilograms per coulomb.
#16 for my reference
An 11.0 m, 280 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.60, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 800 N person climb before the ladder begins to slip?
Two balls, of masses = 50 and = 60 , are suspended as shown in the figure. The lighter ball is pulled away to a 66 angle with the vertical and released. Assume that the positive axis is directed to the right.
Mn(s)
a) is the equation above a redox reaction?
b) what has been reduced?
c) what has been oxidized?
d) what is the reducing agent?
e) what is the oxidizing agent?
f) what is the cathode reaction?
g) what is the anode reaction?
h) calculate the E0 cell
i) is this reaction spontaneous? Explain
j) calculate the equilibrium constant, K at 25°
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