Mole Concept
To help chemists weigh atoms which are extremely small, they devised a counting unit called mole.
Mole is equivalent to ____ particles.
6.02x1023
Which of the following is an example of a vector quantity?
A. 5 kg of rice C. 5 m/s heading North
B. 5 minutes doing DIY crafts D. 5 m/s
C. 5 m/s heading North
In free fall, what is the acceleration of an object when it is at its maximum height?
Gravity
Convert 72 g of Argon to moles:
1.80 mol
A construction worker accidentally drops a brick from a high scaffold. What is the velocity of the brick after 4 s?
-39.2 m/s
Which of the following is not true about the Mole Day celebration?
a. The Mole Day celebration aims to foster interest in chemistry.
b. The Mole Day celebration aims to recognize the significance of Avogadro’s number.
c. The Mole Day celebration is celebrated every 23rd of October from 6:22 a.m. to 6:22 p.m.
d. The Mole Day celebration is celebrated every 23rd of October from 6:02 a.m. to 6:02 pm.
c. The Mole Day celebration is celebrated every 23rd of October from 6:22 a.m. to 6:22 p.m.
What does the speedometer of a car measure?
A. speed C. velocity
B. acceleration D. speed and acceleration
A. speed
Which of the following equations is not included in impulse and momentum?
A. I = Ft C. Ft = mvf-mvi
B. I = 𝚫P D. a =vf - vt
D. a =vf - vt
Convert 2.40 mol of Dinitrogen (N2) to mass (grams)
67.25 grams
A plane is being accelerated uniformly from rest at the rate of 5 m/s2 for 8.5 s. What final velocity does it attain?
42.5m/s
Butane (C4H10) is a hydrocarbon that burns easily and has no color or odor. Typically, it is utilized as heating fuel, a refrigerant, a propellant in aerosols, and fuel for portable stoves and cigarettes. What is the molar mass of C4H10?
58.12 g/mol
What is true about the acceleration of an object moving along a straight line with constant speed?
A. The magnitude of the acceleration of an object moving along a straight line with a constant speed is increasing.
B. The magnitude of the acceleration of an object moving along a straight line with a constant speed is decreasing.
C. An object moving along a straight line having a constant speed has zero acceleration.
D. The object is not moving at all.
C. An object moving along a straight line having a constant speed has zero acceleration.
What are the factors affecting the momentum of an object?
mass and velocity
Convert 4.81 × 1014 molecules of Ammonia (NH3) to moles:
7.99 mol
BONUS
+300 :)
Which of the following is not true about mole as a collection of particles?
a. 1 mole of salt (NaCl) has 6.02 x 1023 formula units.
b. 1 mole of water has 6.02 x 1023 molecules of water.
c. 1 mole of carbon (C) has 6.02 x 1023 atoms of carbon.
d. 1 mole of hydrogen (H) has 6.02 x 1024 atoms of hydrogen.
d. 1 mole of hydrogen (H) has 6.02 x 1024 atoms of hydrogen.
The speedometer of a car moving to the east reads 100 km/h. It passes another car that moves to the west at 100 km/h. What is true about the motion of the two cars?
A. Both cars have the same velocity.
B. Both cars are moving in the same direction.
C. Both cars have the same speed and the same velocity.
D. Both cars have the same speed, but they have opposite velocities.
D. Both cars have the same speed, but they have opposite velocities.
In free fall, what is the velocity of an object when it reaches the maximum height?
Zero
Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its formula is C9H10O. Calculate the percent composition of the compound.
Carbon (C): 80.56%
Hydrogen (H): 7.51%
Oxygen (O): 11.93%
How much force is needed to stop a 4,500 kg truck traveling at 25 m/s in 18 s?
-6,250 N
Who was the mole named after?
Amedeo Avogadro
If you get a traffic ticket for speeding, which of the following does not explain why it is because of your instantaneous speed and not your average speed?
A. It can not be due to your average speed since the traffic police do not know about your entire trip.
B. It is because of instantaneous speed because you were caught at that point in time where you were speeding.
C. It is because of instantaneous speed since the traffic police do not know your starting point or endpoint, or your initial speed.
D. None of the preceding
D. None of the preceding
In projectile motion, what happens to the horizontal velocity all throughout the motion?
remains constant
If the Molecular Formula of Sucrose is C12H22O11, what is its Empirical Formula?
C12H22O11
Mr. Tumamao and his family are on their way home after spending a two-day break at the beach, when suddenly, a passing carabao froze in front of their car’s headlights. Mr. Tumamao, driving at 11.4 m/s, immediately applies the brakes and slows with an acceleration of 3.8 m/s2. If the carabao is 20 m from the family’s car when the brakes are applied, will it hit the carabao?
17.1 m. No it will not hit the carabao