Unit 0 Review

What is the name and purpose of part B?

• Ring stand - used to hold ring clamps and test tube clamps

• Bunsen burner - uses natural gas to provide a flame

• Ring Clamp - attaches to ring stand; used to hold beakers

• Triangle- use to hold objects like crucibles

Answer explanation

A ring clamp attaches to a ring stand. It can hold a beaker or other glass item during a chemical reaction.

Which of the following is a crucible, use to hold chemical while heating to a high temperature?

• 
• 
• 
• 

Answer explanation

An Erlenmeyer flask and glass beaker hold liquids and measure volume. A mortar and pestle is used to crush or grind chemical solids into a powder.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

(Select more than one answer.) According to the MSDS for Hydrochloric Acid (HCl), it can be -

• Corrosive

• highly flammable

• An irritant

• damaging to the ecosystem

Tags

NGSS.MS-PS1-2

According to the MSDS for Hydrochloric acid (HCl), what is the first thing you should do if you get it in your eyes?

• Remove your self to fresh air.

• Rinse cautiously with water for several minutes.

• Immediately remove all contaminated clothing.

• Rinse mouth.

According to the MSDS for Hydrochloric acid (HCl), are there any NFPA codes for firefighters to review in case of emergency?

• Yes

• No

Who would be mostly likely to use this NFPA symbol during an emergency?

• Police officers

• Doctors

• Firefighters

• Paramedics

True or False: NFPA diamonds with the number 0 are the most hazardous.

• True

• False

Answer explanation

NFPA diamonds can contain a number from 0 - 4. 0 represents the least harmful while 4's are the most harmful.

According to the NFPA diamond, the reactivity on this chemical is (a)   .

Tags

NGSS.MS-PS1-2

The Science Club observes that they sell more cookies one day of the week than on any other day. To maximize sales, they create an experiment to answer the question: What day do we sell the most cookies?

What could their hypothesis be?

• If we sell cookies every day of the week then more cookies will sell on rainy days.

• If we sell cookies every day of the week then more cookies will sell on Friday.

• If we sell cookies every day of the week then more cookies will sell on holidays.

Answer explanation

You are answering the question. Holidays and rainy days are not days of the week.

The Science Club conducts their experiment by selling the same type of cookies in the same spot, at the same time by the same people and graphs their data. The graphs shows their data for the week. Which is the independent variable?

• Days of the week

• number of boxes sold

Answer explanation

The independent variable is the variable the experimenter can control. It is always on the X-axis of a graph.