Physical Science Final exam

In a laboratory, the following should not be worn

• Loose clothing

• Dangling jewelry

• Sandals

• All of the above

If a laboratory fire erupts, immediately

• Throw water on the fire

• Open the window

• Run for the fire extinguisher

• Notify your instructor

Long hair in the laboratory must be

• Cut short

• Held away from the experiment with one hand

• Always neatly groomed

• Pulled back and kept entirely out of the way

Approved eye protection devices (such as goggles) are worn in the laboratory

• to avoid eye strain

• to improve your vision

• only if you don't have corrective glasses

• at all times when working with chemicals, glassware, or other objects that put your eyes at risk

Horseplay or practical jokes during a lab are

• Always against the rules

• Okay

• Not dangerous

• Okay if you are working alone

Which of the equations below are balanced?

• Na + O2 --> Na2o

• NaCl --> Na + Cl2

• 2Na + MgF2 --> 2NaF + Mg

• K + Cl2 --> KCl

Which principal states that during a chemical reaction matter is not created or destroyed?

• Conservation of Mass

• Bernoulli's

• Archimedes'

• Pascal's

In the equation 2H2(g) + O2(g) --> 2H2O(l) the g stands for

• gallons

• grams

• gas

• both grams and gas

How many Hydrogen and Oxygen atoms are in the formula Ca(C2H3O2)2 ?

• 5 Hydrogen, 4 Oxygen

• 6 Hydrogen, 4 Oxygen

• 3 Hydrogen, 2 Oxygen

• 5 Hydrogen, 4 Oxygen

What are the reactants in the equation below?

N2 + 3H2 -> 2NH3

• 3H2

• N2 + 3H2

• N2

• 2NH3