Chemistry

Atoms & Periodic Table

100

Which group in the periodic table is the noble gases?  

group 18

200

As you move from left to right across a row on the periodic table, what happens to the size of the atoms?

The atoms get smaller because the nucleus pulls electrons closer.

300

Are elements from the 18th Group reactive or not?

Non-reactive  

400

Which particle has no electrical charge?  

Neutron  

500

How many valence electrons elements of the 17th Group contain?  

7

Chemical Bonding

100

What is the difference between a bonding pair (BP) and a lone pair (LP)?  

A bonding pair is a pair of electrons that is used for bonding, while a lone pair is a pair of electrons that is not used for bonding.  

200

What is the main type of bonding in a water (H₂O) molecule?  

Covalent bonding

300

Which compounds have an ionic bond?  

NaCl  

400

What is covalent bonding?  

An electrostatic attraction between the valence electrons of one atom to the nucleus of another atom. Formed between 2 non- metals  

500

What is the octet rule?  

The octet rule states that electrons tend to gain or lose electrons until they are surrounded by 8 electrons in their outer shell.  

Moles & Avogadro

100

Instead of __, we use mole.  

atoms

200

What is the value of Avogadro's constant?  

6.002 x 10²³ mol^-1

300

To which species does the concept of mole apply?  

To all of them  

400

How many moles is 3.011 x 10²³ CO₂ molecules?  

0.5 moles

500

There are 10 moles of a compound with a 0.1 mol/L concentration. What is the volume (in L)?

100L

Chemical Reactions

100

What type of reaction is this?AgNO₃+NaCl→AgCl(s)+NaNO₃ 

Double displacement

200

_Al+_O₂→_Al₂O3, what number should be placed in places where it emty.

4, 3, 2

300

Iron is heated with copper oxide. Iron oxide and copper are produced. Why does this reaction happen?

Iron is more reactive than copper.

400

When iron rusts, it reacts with oxygen. In this process, the iron:

Is oxidized (loses electrons)

500

What makes a reaction between vinegar and baking soda happen faster?

Using more concentrated vinegar

Acids, Bases & pH

100

What compound is a base?

NaOH (sodium hydroxide)

200

What term describes a solution with a pH value less than 7?

Acidic

300

Lemon juice tastes sour and has a pH of about 2. It is:

A strong acid

400

Salt is a reaction of:

Acid and base

500

What is an indicator?

Indicator is a chemical substance that changes color at a specific pH.