Combination reactions Flashcards
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What is a combination reaction?
A chemical reaction where two or more substances combine to form a single product.
True or False: In a combination reaction, the number of reactants is always greater than the number of products.
True
Fill in the blank: In a combination reaction, reactants can be ______, ______, or ______.
elements, compounds, or both
What is the general form of a combination reaction?
A + B → AB
Which of the following is an example of a combination reaction? A) H2 + O2 → H2O B) H2O → H2 + O2 C) NaCl → Na + Cl2
A) H2 + O2 → H2O
What type of reaction occurs when magnesium burns in oxygen to form magnesium oxide?
Combination reaction
What is formed when nitrogen gas combines with hydrogen gas?
Ammonia (NH3)
True or False: Combination reactions can only occur between two reactants.
False
What is the product of the combination reaction between carbon dioxide and water?
Glucose (C6H12O6) during photosynthesis
Which of the following is NOT a characteristic of combination reactions? A) Formation of a single product B) Reactants are always in gas form C) Involvement of elements or compounds
B) Reactants are always in gas form
What is the primary use of combination reactions in the industrial synthesis of ammonia?
To produce fertilizers
Fill in the blank: Combination reactions are often exothermic, meaning they ______.
release heat
What happens during the combination reaction of sulfur dioxide and oxygen?
They form sulfur trioxide (SO3).
True or False: Combination reactions can be used to generate energy.
True
What is the role of combination reactions in the formation of rust?
Iron reacts with oxygen and water to form iron oxide.
What is one real-world application of combination reactions in medicine?
The synthesis of certain pharmaceuticals.
Which reaction is an example of a combination reaction in everyday life? A) Photosynthesis B) Electrolysis C) Combustion
A) Photosynthesis
Fill in the blank: The combination of hydrogen and chlorine gas produces ______.
hydrogen chloride (HCl)
What type of reaction is the formation of water from hydrogen and oxygen?
Combination reaction
True or False: Combination reactions can occur in both gaseous and aqueous states.
True
What is an example of a combination reaction that occurs in the atmosphere?
Formation of ozone (O3) from oxygen (O2).
Which of the following is a product of the combination reaction between calcium and oxygen? A) Calcium oxide B) Calcium carbonate C) Calcium hydroxide
A) Calcium oxide
Fill in the blank: In a combination reaction, the total mass of the reactants ______ the total mass of the products.
equals
What is the significance of combination reactions in biological systems?
They are essential for processes like cellular respiration and photosynthesis.
