Chemistry Practice Exam 2
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Questions and Answers

A kind of solid which is characterized as consisting of ordered three-dimensional arrays of structure motif is classified as ______ solids.

  • Amorphous
  • Beta
  • Crystalline (correct)
  • Alpha

    • What crystalline structure has a coordination number of 12?

  • Simple cubic
  • Face-centered cubic (correct)
  • Body-centered cubic
  • Diamond cubic

    • A pendulum bob has a mass of 0.5 kg. When released from an angle of 36 degrees, find the maximum potential energy at this position relative to its lowest position.

    2.82 J

    What are engineering materials formed from repeating organic molecules?

    <p>Polymer</p> Signup and view all the answers

    Match the following terms with their corresponding descriptions:

    <p>Commission = Correct and rate licensure examination papers APO = No matching description provided IECEP = No matching description provided None of these = No matching description provided</p> Signup and view all the answers

    When the ball leaves your hand with a velocity of 10 m/s at an angle of 20° below the horizontal, how far horizontally from your window will the ball hit the ground? Ignore air resistance.

    <p>4.6 m</p> Signup and view all the answers

    What must be the tension in the rope to give a 5.0 kg object an upward acceleration of 0.30 m/s^2?

    <p>40.1 N</p> Signup and view all the answers

    In the Figure shown, the tension in the horizontal cord is 30 N. Find the weight of the object.

    <p>20 N</p> Signup and view all the answers

    Match the following programming languages with their primary usage:

    <p>Python = General-purpose programming JavaScript = Client-side scripting for web applications SQL = Database queries CSS = Styling web pages</p> Signup and view all the answers

    If water drips from a nozzle of a shower onto the floor 2.45m below at regular intervals, and the first drop hitting the floor coincides with the start of the third drop, where is the second drop when the first drop strikes the floor?

    <p>0.2512 m</p> Signup and view all the answers

    Sir Robin dropped a stone into the water from 44.1m above the ground. Another stone is thrown vertically down 1.0s after the first one. What was the initial velocity of the second stone?

    <p>14.25 m/s</p> Signup and view all the answers

    Approximately how high is a water well in PUP CEA if a rock dropped into it produces a splash 8 seconds after being released (Speed of sound in air is 340 m/s)?

    <p>257 m</p> Signup and view all the answers

    What is the resultant displacement when a 50 cm displacement in the +x direction is added to give a resultant displacement of 85 cm at 25 degrees?

    <p>62 cm</p> Signup and view all the answers

    Match the following programming languages with their primary usage:

    <p>Python = General-purpose programming JavaScript = Client-side scripting for web applications SQL = Database queries CSS = Styling web pages</p> Signup and view all the answers

    What force should be applied to the block so that it moves down without any acceleration?

    <p>4.9 N</p> Signup and view all the answers

    What is the coefficient of friction between the 400g block and the tabletop?

    <p>0.28</p> Signup and view all the answers

    How far will the 400g block slide along the horizontal tabletop before stopping?

    <p>0.36 m</p> Signup and view all the answers

    What is the acceleration of the 70kg box when pulled by a 400N force at a 30-degree angle to the horizontal?

    <p>2.2 m/s^2</p> Signup and view all the answers

    Match the following:

    <p>Acceleration of the 70kg box = 2.2 m/s^2 Coefficient of friction between the block and the tabletop = 0.28</p> Signup and view all the answers

    What is the speed of object B when the two objects collide and stick to each other and stop?

    <p>9.2 m</p> Signup and view all the answers

    What is the recoil velocity of the rifle?

    <p>0.5 m/s</p> Signup and view all the answers

    What is the final velocity of glider A after the collision?

    <p>3.1 m/s</p> Signup and view all the answers

    What is the velocity of the wreckage just after impact?

    <p>7.1 m/s @ 49°</p> Signup and view all the answers

    What is the speed of the toboggan and kid when they reach the bottom of the hill?

    <p>18.4 m/s</p> Signup and view all the answers

    Find the final speed of ball B and the values of angle alpha and beta in degrees.

    <p>2.22; 36.9; 15.8</p> Signup and view all the answers

    What is the molality of a solution of ethyl alcohol, C2H5OH, in water if 1.54 mol/kg is dissolved in 2.5 kg of water?

    <p>1.77 g</p> Signup and view all the answers

    Calculate the number of C atoms in 0.350 mol of C6H12O6.

    <p>1.26 x10^24 atoms</p> Signup and view all the answers

    Calculate the percentage composition of oxygen in sucrose.

    <p>42.1 %</p> Signup and view all the answers

    Materials composed of more than one material type to display a combination of characteristics are called?

    <p>Composites</p> Signup and view all the answers

    What will be the resultant velocity of a bullet and a block moving in the same direction when the bullet embeds into the block?

    <p>32.82 m/s</p> Signup and view all the answers

    What oath is required for practicing as a PECE, ECE, or ECT?

    <p>God-fearing</p> Signup and view all the answers

    What term refers to the ability of an engineering material to withstand force, pressure, or stress?

    <p>Strength</p> Signup and view all the answers

    Calculate the molarity of a solution made by dissolving 23.4 g of sodium sulfate, Na2SO4, in 125 mL of water.

    <p>1.32</p> Signup and view all the answers

    According to section 2-Statement of Policy, the state shall therefore develop and nurture competent, virtuous, productive, and _____ PECE, ECE, and ECTs.

    <p>Versatile</p> Signup and view all the answers

    What is a type of bond which does not have security except a promise to pay by the issuing corporation?

    <p>Debenture</p> Signup and view all the answers

    What is the title of Section 6 of RA 9292?

    <p>Nature and Scope of Practice of Electronics Engineering and Electronics Technician Professions</p> Signup and view all the answers

    A market situation in which two competing buyers exert controlling influence over many sellers. A.Bilateral monopoly B.Oligopoly C.Duopsony D.Duopoly

    <p>oligopoly</p> Signup and view all the answers

    A CPD Council Secretariat is created at the PRC Central and Regional Offices to provide technical, administrative, and operational support to the CPD Councils and the PRBs in the implementation of the CPD Programs.

    <p>True</p> Signup and view all the answers

    What is the title of Section 23 of RA 9292?

    <p>Revocation and Suspension of Certificate of Registration, Professional Identification Card and Cancellation of Special Permits</p> Signup and view all the answers

    According to Republic Act 10912, what does 'Formal learning' refer to?

    <p>Formal learning</p> Signup and view all the answers

    What should you be doing to prepare for an exam?

    <p>Reviewed</p> Signup and view all the answers

    What is the size of seven equal annual payments to repay a loan of P2,000 at 12% interest?

    <p>P438</p> Signup and view all the answers

    Study Notes

    Here are the study notes for the text:

    Practice Exam for Summative Exam 2

    • Quantitative Analysis*
    • A practice exam for summative exam 2, consisting of 60 questions.
    • Questions cover various topics, including chemistry, physics, engineering economics, and more.
    • Chemistry*
    • Question 2: Calculate the number of C atoms in 0.350 mol of C6H12O6.
    • Question 3: Calculate the percentage composition of oxygen in sucrose.
    • Question 24: Calculate the mass of one molecule of Acetic Acid: CH3COOH.
    • Question 44: Calculate the percentage of carbon in aspirin.
    • Physics*
    • Question 6: A bullet strikes a block moving at 30 m/s in the same direction. Calculate the resultant velocity of the bullet and the block.
    • Question 11: A man keeps a 1kg toy airplane flying horizontally in a circle by holding onto a 1.50 m long string attached to its wing tip. Calculate the tension in the string.
    • Question 14: A 15g bullet is fired horizontally into a 3kg block of wood, and sticks in it. Calculate the velocity of the bullet.
    • Question 21: An 8g bullet is fired horizontally into a 9kg block of wood, and sticks in it. Calculate the velocity of the bullet.
    • Engineering Economics*
    • Question 1: A solution of ethyl alcohol, C2 H5 OH, in water has a molality of 1.54 mol/kg. Calculate the number of grams of alcohol dissolved in 2.5 kg of water.
    • Question 4: Miss Catriona deposited P 1,000, P 1,500, and P 2,000 at the end of the 2nd, 3rd, and 4th years, respectively, in a savings account earning 10% per annum. Calculate the amount in the account at the end of the 4th year.
    • Question 12: A man paid a 10% down payment of P 200,000 for a house and lot and agreed to pay the balance on monthly instalments for 5 years at an interest rate of 15% compounded monthly. Calculate the monthly instalment in pesos.
    • And many more questions covering various topics...*

    Let me know if you'd like me to summarize anything else!Here are the study notes for the text:

    Physics Problems and Solutions

    Free Fall and Vertical Motion

    • A package is dropped from a helicopter moving upwards at 15 m/s. If it takes 25 s to reach the ground, how high above the ground was the package when released? (Answer: 3.2 km)
    • A stone is dropped from a height of 19.6m. When and where will it meet a second stone projected from the ground? (Answer: 2 s, 14.7 m)
    • A ball is thrown straight up from the top of a building at 26.2 m/s. Determine the height to which the ball will rise above its initial height. (Answer: 31 m)

    Relative Motion

    • A car starts from rest and accelerates uniformly. After what time will it overtake another car moving at a constant speed? (Answer: 11 s)
    • A ship is sailing due east at 15 km/hr. What must be the speed of a second ship heading in a direction 30° east of north if it is always due north of the first ship? (Answer: 25 km/hr)

    Forces and Acceleration

    • A 2000 kg car is moving at a velocity of 35 m/s. How long does it take to stop if a braking force of 4000 N is used? (Answer: 17.5 s)
    • A wheel of 40 cm radius rotates on a stationary axle. It is uniformly speeded up from rest to a speed of 900 rpn in a time of 20 s. Find the tangential acceleration of a point on its rim. (Answer: 4.2 m/s^2)

    Rotational Motion

    • A wheel of 40 cm radius rotates on a stationary axle. It is uniformly speeded up from rest to a speed of 900 rpn in a time of 20 s. Find the constant angular acceleration of the wheel. (Answer: 2.2 rad/s^2)
    • The spin-drier of a washing machine revolving at 900 rpm slows down uniformly to 300 rpm while making 50 revolutions. Determine the time required to turn through these 50 revolutions. (Answer: 5.0 s)

    Linear Motion

    • A car starts from rest at constant acceleration. After what time will it overtake a truck moving at a constant speed? (Answer: 12 s)
    • A boy observes a cricket ball move up and down past a window 2 m high. The total time the ball is in sight is 1.0 s. Find the height above the window that the ball rises. (Answer: 0.2251 m)

    Energy and Work

    • A 50.0-kg marathon runner runs up the stairs to the top of a 443-m-tall building. To lift herself to the top in 15.0 minutes, what must be her average power output? (Answer: 1.2 hp)

    Note: These notes are written in a concise manner, focusing on key facts and answers.Here are the study notes for the text:

    Forces and Motion

    • Force and Acceleration: A net force F is required to give an object with mass m an acceleration a. If a net force 6F is applied to an object with mass 2m, the acceleration is 2a, 3a, or 4a. (Questions 11-13)
    • Friction: The coefficient of kinetic friction between two objects affects the force required to move them. (Question 12)
    • Inclined Planes: The force required to pull a wagon up an inclined plane depends on the angle of the plane and the coefficient of friction. (Question 33)
    • Pulleys and Inclined Planes: The force required to lift a mass up an inclined plane using a pulley system depends on the angle of the plane and the coefficient of friction. (Question 34)

    Energy and Work

    • Power: The power required to lift an object to a certain height depends on the mass of the object, the height, and the time taken. (Question 8)

    Rotational Motion

    • Angular Velocity and Acceleration: The angular velocity and angular acceleration of a rotating wheel can be calculated using the formulas ω = Δθ / Δt and α = Δω / Δt. (Questions 4-5)
    • Rotational Kinematics: The time required to rotate through a certain angle can be calculated using the formula θ = ωt + (1/2)αt^2. (Question 12)

    Linear Motion

    • Position-Time Graphs: The position-time graph of an object moving with constant acceleration can be used to determine the acceleration. (Question 29)
    • Velocity and Acceleration: The velocity and acceleration of an object can be calculated using the formulas v = Δx / Δt and a = Δv / Δt. (Questions 9-10)
    • Projectile Motion: The trajectory of a projectile can be calculated using the formulas x = v0t and y = v0t - (1/2)gt^2. (Questions 1-2)
    • Collisions: The velocity of two objects after a collision can be calculated using the formulas v1 = (m1v01 + m2v02) / (m1 + m2) and v2 = (m1v01 + m2v02) / (m1 + m2). (Question 3)

    Work and Energy

    • Kinetic Energy: The kinetic energy of an object can be calculated using the formula K = (1/2)mv^2. (Question 15)
    • Gravitational Potential Energy: The gravitational potential energy of an object can be calculated using the formula U = mgh. (Question 14)

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    Practice questions for chemistry exam 2, covering topics such as molality, atom calculation, and percentage composition.

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