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Fatima is studying endothermic reactions. She knows that photosynthesis is an endothermic process. What happens to the enthalpy (ΔH) in an endothermic reaction?

A ΔH is negative B ΔH is positive C ΔH is zero D ΔH is undefined

Petroleum is an important source of:

A Inorganic compounds B Organic compounds C Metals D Salts

Which group elements are soft and highly reactive?

A Noble gases B Alkali metals C Halogens D Transition metals

Waleed is learning about esters. He understands that esters are formed from carboxylic acids and alcohols. Which of the following is an ester?

A Ethyl acetate B Ethanol C Acetic acid D Acetone

Nuclear chemistry deals with:

A Chemical bonding B Reactions in atomic nucleus C Carbon compounds D Chemical analysis

Which shell is closest to the nucleus?

A K B L C M D N

Carlos is learning about the structure of graphite and diamond. He knows that both are allotropes of carbon. What is the key difference in the bonding of graphite and diamond?

A Diamond has ionic bonds, graphite has covalent bonds B Diamond has a three-dimensional covalent network, graphite has layers with weak forces C Graphite has metallic bonds, diamond has covalent bonds D Both have the same bonding

Oxidation occurs at the:

A Cathode B Anode C Electrolyte D Salt bridge

Ethane belongs to which class?

A Alkene B Alkyne C Alkane D Alcohol

Zara is studying the combustion of alkanes. She knows that alkanes are used as fuels. Which of the following is a clean-burning fuel?

A Coal B Methane C Diesel D Gasoline

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