Chemistry Lab Safety Rules

Chemistry Lab Safety Rules

We are beginning a new unit of study with chemistry. Studying chemistry means using lab equipment and chemicals that are potentially harmful if misused. It is very important that lab rules are followed at all times.

General Guidelines:

1. Read and follow directions.

2. Never perform unauthorized experiments.

3. When entering the room, do not touch any equipment, chemicals, or other materials until told to do so by your teacher.

4. Never fool around.

5. Stay in your assigned lab area.

6. No food or drinks in the lab.

Appropriate Dress:

1. Tie back long hair.

2. No dangling sleeves or bracelets.

3. WEAR SAFETY GOGGLES AT ALL TIMES.

Safety with Chemicals:

1. Never taste or sniff chemicals.

2. Transport chemicals carefully in the lab.

3. Dispose of chemicals properly.

4. Report spills immediately.

5. Leave the lab area neat. Clean and rinse lab equipment if instructed to.

Bunsen Burners and Hot Plates:

1. Keep clothing and body parts away from flames and hot plates.

2. No reaching around or over flames or hot plates.

3. Turn burners and hot plates off when not in use.

4. Report any unlit burners or gas smells to the teacher immediately.

In case of an accident:

1. Report all accidents, spills, and broken lab equipment right away!

2. Never handle broken glass or attempt to clean up spills on your own.

3. Report wet floors to the teacher immediately.

4. If chemicals get on your skin or in your eyes, rinse with lots of running water and report the accident immediately.

5. Be aware of the location of the eye wash station, fire extinguisher, and fire blanket.

Lab Safety Agreement:

I will take responsibility for my own behavior and for my achievement in this class. I will follow the teacher’s instructions, protect my body during experiments, and act responsibly. I understand that I must demonstrate appropriate behavior at all times to be allowed to participate. I am aware that if I do not abide by the above rules I not only risk putting myself in danger of getting hurt, but others too. I understand that breaking any rule means removal from the lab exercise and other disciplinary actions.

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Student Signature

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Parent Signature

Homework 12/7

Name _________________________________

Centripetal Force and Fluid Pressure

1. _______________________________ is a false force that makes you feel as if you are being pulled out of circular motion, opposite to centripetal force.

2. Centripetal forces always act toward _________________________________________.

3. If centripetal force is removed, an object will continue traveling ______________________________________ perpendicular (tangent) to the center of the circle.

4. The Moon travels around the Earth because ___________________ from the Earth pulls the Moon out of the straight line it wants to travel and into a circular orbit.

5. A _________________ is a material that can flow and take the shape of its container.

6. As you travel up the side of a mountain gaining altitude, what happens to air pressure?

7. As you descend into the ocean, what happens to the fluid pressure the deeper you get?

8. If a fluid is CONFINED in a container and pressure is applied to the container, what can you say about the pressure?

9. What type of moving air has the lowest pressure?

10. Slow moving air under airplane wings creates an area of _______________ pressure that produces lift and pushes an airplane off the ground.

Physics: Final Quiz

Study Guide: Physics Quiz

Centripetal Force, Pressure in Fluids, Pascal’s Principle, and

Bernoulli’s Principle

1. Centripetal Force

A. Centripetal Forces always acts toward the center of a circle

B. What happens if CF is removed?

C. Be able to label the CF in a situation and draw a line showing the direction of motion if CF is removed.

D. Why is Centrifugal Force fake?

2. Pressure

A. What is pressure?

B. What causes pressure in a fluid?

C. What is air pressure?

D. What is air pressure (atmospheric pressure) at sea level?

E. What happens to air pressure as altitude increases?

F. What happens if air pressure is different inside and outside an object or structure?

G. What is Pascal’s Principle? How does a Cartesian Diver work?

H. What is Bernoulli’s Principle? How does Bernoulli’s Principle help an airplane fly? Be able to describe how Bernoulli’s Principle is working in different situations.

Centripetal Force HW

NOTE: IF YOU ARE COPYING THIS AT HOME... PICTURES ARE MISSING. YOU WILL HAVE TO DRAW YOUR OWN PICTURES TO ANSWER SOME QUESTIONS.

Name __________________________

Date __________

Centripetal Force Homework

1. Centripetal force always acts ____________________________________________.

2. Draw an arrow showing the direction the moon would travel if the Earth’s gravitational pull disappeared at the point shown.

3. When a car is racing on a track, what supplies the centripetal force to allow the car to turn the corners?

4. On a roller coaster loop, what supplies the centripetal force to make the coaster go in a circle? Why don’t you fall out when you go upside down in the loop?

5. Describe a situation that uses Centripetal Force to cause circular motion. What is supplying the centripetal force? What would happen if the centripetal force were removed?

Study Guide for final Physics Quiz

Study Guide: Physics Quiz

Centripetal Force, Pressure in Fluids, Pascal’s Principle, and

Bernoulli’s Principle

1. Centripetal Force

A. Centripetal Forces always act toward the center of a circle

B. What happens if CF is removed?

C. Be able to label the CF in a situation and draw a line showing the direction of motion if CF is removed.

D. Why is Centrifugal force fake?

2. Pressure

A. What is pressure?

B. What causes pressure in a fluid?

C. What is air pressure?

D. What is air pressure (atmospheric pressure) at sea level?

E. What happens to air pressure as altitude increases?

F. What happens if air pressure is different inside and outside an object or structure?

G. What is Pascal’s Principle? How does a Cartesian Diver work?

H. What is Bernoulli’s Principle? How does Bernoulli’s Principle help an airplane fly? Be able to describe how Bernoulli’s Principle is working in different situations.

Name ____________________________

Forces and Friction Homework (pages 374-387)

_______________________ 1. A force that pulls all objects toward each other.

_______________________ 2. As distance between objects increases, what happens to

gravity?

_______________________ 3. True or False: All objects in the Universe are gravitationally

attracted to all other objects in the universe.

_______________________ 4. When you step on a bathroom scale, you are determining the

gravitational force Earth is exerting on your mass. What is

another way to describe what the scale is measuring?

_______________________ 5. The amount of gravity depends on the amount of:

_______________________ 6. When gravity is the only force acting on a falling object, the

object is said to be in:

_______________________ 7. When a feather slowly floats to the ground, a type of fluid

friction called _________ is acting on the feather to slow its fall.

_______________________ 8. An object that is thrown instead of dropped is called a

projectile. True or False: An object that is thrown straight

out (an object with projectile motion) will fall at the same

rate as an object that is dropped from the same height.

_______________________ 9. When two solid surfaces move past each other, this type of

friction resists the motion.

_______________________ 10. To decrease sliding friction, oil is added to some machinery.

This creates a different kind of friction that is less resistant

than sliding friction. What kind of friction is created when

oil is applied to machinery?

_______________________ 11. When you help your family move a heavy piece of furniture,

what kind of friction resists your initial attempts at moving

the furniture?

________________________ 12. A force that resists the movement between two surfaces.

________________________ 13. When the net force applied to an object causes a change in

velocity, the forces can be described this way:

________________________ 14. Equal forces acting on an object. The net force is zero and

there is no change in velocity.

________________________ 15. If two forces are applied to the same side of the box (in the

same direction) and the forces are both equal to 20N, what

is the net force acting on the box?

________________________ 16. A push or a pull that attempts to change the velocity of an

object.

Study Guide Chapter 11

Forces

1. What is a force? (pages 374 – 377)

A. Define forces and give examples.

B. A Newton (N) is the unit for measuring a force like weight.

C. Net Force – the combination of all forces acting on an object. When two or more forces act in the same direction, add the forces. When two or more forces act in opposite directions, add them together but one of the forces is acting in a “negative” direction so it’s like adding positive and negative numbers.

D. Unbalanced Forces – When there is a net force acting on an object. Basically there is more push or pull from one direction than the other. This means that there will be a change in the object’s velocity in the direction of the greatest force.

E. Balanced Forces – Equal forces acting on one object in opposite directions. Balanced Forces do not change an object’s velocity.

2. Friction, Gravity (pages 380 – 388)

A. Friction – A force that two surfaces exert on each other when they rub up against each other. It acts in a direction opposite to the motion of objects.

B. Without friction or another unbalanced force, a moving object will not stop until it strikes another object.

C. Friction is caused by the irregular and bumpy surfaces of objects. The bumpier the surface, the more friction. Friction also depends on how hard the surfaces push together.

D. Types of friction:

1. Static Friction – Right before an object starts to move.

2. Sliding Friction – Two solid surfaces slide over one another.

3. Rolling Friction – When an object rolls over a surface.

4. Fluid Friction – When a solid object moves through a fluid like water or air. Air resistance is a type of fluid friction.

E. Gravity – Force that pulls objects together. Gravity is caused by mass. The more mass an object has, the greater the gravity. The closer objects are to each other, the more gravity will affect the objects.

F. Weight = mass x acceleration due to gravity (9.8 m/s )

G. Free Fall – When the only force acting on as object is gravity. All objects in free fall accelerate at the same rate regardless of mass. Air resistance can slow objects down if their shape is changed to increase air friction. Terminal Velocity is when the downward force of gravity and the upward force of drag are equal on a falling object.

H. Projectile Motion – If an object is given horizontal motion as well as vertical, the motions are independent of each other. Throwing an object harder in a horizontal direction will not make it drop slower. It will travel farther per second away from the drop point than an object thrown will less force but it will fall toward Earth at the same rate.

3. Newton’s Laws of Motion (pages 389 – 397)

A. First Law of Motion – Objects at rest tend to stay at rest unless acted upon by an outside force. Objects in motion tend to stay in motion unless acted upon by an outside force.

1. Inertia – Tendency of an object to resist a change in motion.

B. Second Law of Motion – Force = Mass x Acceleration

C. Third Law of Motion – For every action there is an equal but opposite reaction.

D. Momentum – Quantity of motion that depends on the mass of an object and its velocity. People usually use Newton’s Second Law of Motion to describe Momentum.