Chemistry Pre-Assessment

What are the vertical columns on the periodic called?

• groups

• periods

• nonmetals

• metals

• metalloids

How do you calculate the number of neutrons? *

• Mass = Atomic number - Neutrons

• Mass - Atomic number = Neutrons

• Atomic number = Neutrons

Water is boiled in a bottle with a balloon over the top. As the water heats, the balloon expands. What has happened to the weight of this bottle and balloon in this experiment?

• It has increased as the balloon expands.

• It has decreased as the water boiled away.

• It has stayed the same.

• It is unpredictable because the balloon is flexible.

Which of Mark’s observations would show that a burning candle has physical changes?

• Black smoke is given off; hot gases are rising.

• The wax starts to melt.

• The flame glows red and orange.

• Time passes one minute at a time.

Tags

NGSS.MS-PS1-2

An element is determined by...

• How many protons it has

• How many neutrons it has

• How many electrons it has

An ion is when...

• An atom has extra or less protons in it

• An atom has extra or less neutrons in it

• An atom has extra or less electrons in it

Below is the chemical equation for sodium and water:

2Na + 2H₂O → 2NaOH + H₂

What are the reactants?

• sodium and water

• sodium hydroxide and hydrogen

• Only sodium

• hmmm, not quite sure

Tags

NGSS.MS-PS1-1

What must be in the blank space behind the Nitrogen for this chemical equation to be completely balanced?

• Nothing, the equation is already balanced

• 1

• 2

• 3

Tags

NGSS.MS-PS1-5

If HCl and NaOH react in a neutralisation reaction, what must their two products be?

HCl + NaOH ---> ___ + ___

• These will not react together, so therefore there will be no products

• NaCl and H₂O

• Na₂O and Cl₂

• NaH and Cl₂O

Tags

NGSS.MS-PS1-2

A proton is...

• Positively charged

• Neutral

• Negatively charged

• Not a thing