Atoms and elements
The Periodic Table
Compounds, Mixtures and Formulas
Chemical and Physical Changes
Lab safety
100

What is the smallest unit of matter?

atom

100

what does the periodic table organize?

elements by their atomic number

100

what is the difference between an element and a compound?

a element is made of one kind of atom , a compound is made of two or more elements.

100

what is physical change?

change in form or appearance without making a new substance.

100

what should you always wear to protect your eyes in the lab?

goggles

200

what are three subatomic particles?

protons,neutrons and electrons.

200

what is the symbol for sodium?

Na

200

is salt(NaCl)an element or a compound?

compound

200

what is chemical change?

change that forms a new substance

200

What should you do if a chemical spills on your skin?

rinse it immediately and tell the teacher 

300

what is the centre of an atom called?

nucleus

300

which group on the periodic table contains carbon?

Group 14

300

what is a  mixture?

combination of two or more substances not chemically bonded

300

is melting ice a chemical or physical change?

physical

400

what charge does a proton have?

positive electric charge

400

what do we cal a horizontal row on the periodic table?

a period

400

what is a chemical formula for water?

H2O

400

Give one sign of a chemical change?

color change,temperture change,gas or light formation

500

what is the atomic number of an element? 

number of protons in the nucleus

500

what do we call a vertical colum on the periodic table?

a group or family

500

is air a compound or a mixture?

mixture

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