15 Questions
If you react 4 units of A with 10 units of B in the given chemical equation, what is the relationship between the amounts of A and B?
The amounts of A and B are equivalent.
What is the primary function of a catalyst in a chemical reaction?
A catalyst increases the rate of reaction by decreasing the activation energy.
Which of the following best describes a limiting reactant?
A limiting reactant is the reactant that determines how much product can be made.
What is the result of adding neutrons to an atom's nucleus?
The atomic weight of the element is changed.
Which of the following statements about the relationship between an element's atomic number and atomic weight is correct?
An element's atomic number determines the number of protons.
In the chemical equation 2A + 5B → C + 3D, what is the largest amount of C that can be produced from 4 units of A and 10 units of B?
4 units
Which of the following statements about catalysts is true?
A catalyst increases the rate of a reaction by providing an alternative pathway with lower activation energy.
What is the purpose of a bulking agent in a product?
To add volume to the product without altering its quality.
According to the collision theory, which of the following is a necessary condition for a chemical reaction to occur?
The reactants must collide with a minimum kinetic energy.
Which of the following statements about capillary action is correct?
Capillary action is the result of cohesive forces between molecules of the same substance.
Which of the following statements about ion-dipole interactions is correct?
Ion-dipole interactions occur between an ion and a polar molecule.
Which of the following statements about the Big Bang Theory is correct?
The Big Bang Theory suggests that the universe began from a singularity and is expanding.
Which of the following statements about carbon disulfide (CS2) is correct?
CS2 is an example of a non-polar covalent bond.
If a detergent has a pH of 4.5, what can be said about its acidity?
The detergent is acidic.
Which of the following statements about crushing a solid into a powder is correct?
Crushing a solid into a powder increases the reaction rate due to increased surface area.
Study Notes
Chemical Reactions
- A catalyst increases the rate of a reaction by lowering the activation energy.
- A limiting reactant determines how much product can be made.
- In the equation 2A + 5B → C + 3D, if 4 units of A react with 10 units of B, there are equivalent amounts of A and B.
Atomic Structure
- An element's atomic number determines the number of protons.
- An element's atomic weight determines the number of protons and neutrons.
Molecular Interactions
- Attraction between an ion and a polar molecule is the result of ion-dipole interaction.
- Cohesive forces bring about capillary action and are attractions among different molecules.
Chemical Bonding
- CS2 is not an example of a polar covalent bond.
Products and Manufacturing
- An active ingredient provides the desired and specified effect of a product.
- A bulking agent adds volume to a product without altering its quality.
- In a tricycle factory, if 270 tires, 90 frames, and 170 pedals are available, tires would limit the number of complete tricycles that can be assembled.
Cosmology
- The Big Bang Theory suggests that the universe began from a singularity and its expansion.
pH and Acidity
- A pH of 4.5 is described as more acidic, as seen in Detergent W.
Test your knowledge on chemical equations, reactants, catalysts, limiting reactants, and compound formation. Includes questions on balancing equations, identifying limiting reactants, and understanding the role of catalysts in reactions.
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