Grade 9 End of year Chemistry review

Which of the following is not an example of a chemical reaction

• burning of wood
• freezing of water
• rotting of fruit
• explosion of dynamite

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What two products are usually produced from a combustion reaction?

• a chemical salt and hydrogen gas
• oxygen gas and a cloudy liquid
• water vapour and carbon dioxide gas
• carbon dioxide and smoke

What is not an indication of a chemical change?

• smell produced
• heat produced
• solid produced
• melting

Tags

NGSS.MS-PS1-2

Name the elements in
NaHCO₃

• sodium, hydrogen, carbon, oxygen
• sulfur, hydrogen, cobolt
• sodium, hydrogen, cobolt
• sulfur, hydrogen, carbon trioxide

Tags

NGSS.MS-PS1-1

The chemical formula for sulfuric acid is H₂SO₄ 
How many atoms are present?

• 3
• 6
• 7
• 10

Tags

NGSS.MS-PS1-1

The mass of an atoms nucleus is the sum of 

• protons + neutrons
• electrons + neutrons
• electrons + protons

Methane burning in oxygen is an example of

• photosynthesis
• combustion
• decomposition
• neutralisation

The amount of reactants should equal the amount of products.  This is the rule for

• chemical reactions
• acid base reactions
• conservation of mass
• neutralisation reactions

Tags

NGSS.HS-PS1-7

Exothermic reactions

• happen on the outside
• take in heat
• give off heat
• happen on the inside

Tags

NGSS.HS-PS1-4

Which of the following is an example of an element?

• Water
• Carbon 
• Oil
• Carbon Dioxide 

Tags

NGSS.HS-PS1-1