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Worksheets9. Sınıf Kimya-Kimya Bilimi-3 (Elem.-comp., Hazard Symbols)
Total questions: 21
Worksheet time: 13mins
Which statement about atoms and molecules is correct?
Elements always exist as separate atoms.
Elements always exist as pairs of atoms called molecules.
Elements and compounds can exist as molecules.
What is the best definition of a compound?
A substance made up of two or more elements that are chemically combined.
A substance made up of two or more elements that are chemically combined in fixed proportions.
A substance made up of two elements that are chemically combined in fixed proportions.
This picture represents which of the following?
element
compound
mixture
This picture represents which of the following?
element
compound
mixture
____________ contains only one kind of atom.
element
compound
mixture
____________ contains two or more types of atoms combined.
element
compound
mixture
Which of the following chemical formula represents a compound?
O3
F2
CH3CHO
P4
A new compound has been discovered. Here is the chemical formula: CHOFeNaNPb
How many elements are in this compound?
5
6
7
10
Provided is a list of five different substances. How many of these substances are elements?
NaOH
Cu
H2O
H2
N2
2
3
4
5
What is the CORRECT procedure for students to follow if a chemical is spilled?
Stand back and advise the teacher of the spill.
Run madly out of the room.
Splash large amounts of water onto the spill.
Immediately ask to go to the restroom.
At the end of the lab you see some leftover chemical that looks just like the stuff you were using. You should:
put the chemical back in the jar it came from.
sweep it into your hand and throw it out.
tell the teacher so you can dispose of it properly.
tell your classmates that your lab partner is really messy.
Bob and Lizzy are working in the lab. They are goofing off and break a glass test tube. Which rule did they break?
Know the location of the safety equipment.
Do not eat or drink in the lab.
Read instructions.
No playing around.
Which of the following are examples of dressing appropriately in the lab?
Pulling long hair back.
Leaving long hair down to get in the chemicals.
Wearing sandals.
You have been injured in the laboratory (cut, burn, etc.). First you should;
apply first aid yourself.
tell the science instructor at once.
see a doctor after school.
visit the school nurse after class.
Match the hazard symbols to the correlating hazards.
(a) The adverse effects of a substance that result either from a single exposure or from multiple exposures in a short space of time. May be fatal or toxic.
Match the hazard symbols to the correlating hazards.
(a) Strong oxidizers are capable of forming explosive mixtures when mixed with combustible, organic or easily oxidized materials.
Match the hazard symbols to the correlating hazards.
(a) The effects of manufactured chemicals and natural materials and activities on aquatic organisms.
Match the hazard symbols to the correlating hazards.
(a) Causes skin corrosion or burns, can cause eye damage. Corrosive to metals.
Match the hazard symbols to the correlating hazards.
(a) Explosive articles, and substances as well as mixtures and articles that are manufactured to produce a practical explosive or pyrotechnic effect.
Match the hazard symbols to the correlating hazards.
(a) Flammable gases, liquids, or aerosols; self-reactive or pyrophoric material; self-heating substances and mixtures, organic peroxides.
Match the hazard symbols to the correlating hazards.
(a) Harmful to the skin or eyes, a skin sensitizer or respiratory irritant, may experience narcotic effects.
