Answer the following question given this paragraph: An amide can be formed by combining a carboxylic acid and an amine. Only primary and secondary amines can be used to form amides, since they have a hydrogen that can be replaced with the carbonyl carbon; tertiary amines will not form amides. The amide shown in the Figure above was formed from a carboxylic acid and a primary amine. Q: What can be combined with an amine to form an amide? Choices: - carbon dioxide - ketones - acetic acid - carboxylic acid A:
carboxylic acid
(Question)
Answer the following question given this paragraph: The voltage of a voltaic cell can be determined by the reduction potentials of the half reactions. Q: The voltage of a voltaic cell can be determined by the reduction potentials of what? Choices: - full reactions - thermal reactions - old reactions - half reactions A:
(Answer)
half reactions
Ques: Answer the following question given this paragraph: A chemical reaction is a process that changes some chemical substances into others. During a chemical reaction, the reactants are used up to create the products. Q: What is the term for a process that changes some chemical substances into others? Choices: - acid reaction - toxic reaction - chain reaction - chemical reaction A:
Ans: chemical reaction
(Q).
Answer the following question given this paragraph: In summary, aerobic and anaerobic respiration each have advantages under specific conditions. Aerobic respiration produces far more ATP, but risks exposure to oxygen toxicity. Anaerobic respiration is less energy-efficient, but allows survival in habitats which lack oxygen. Within the human body, both are important to muscle function. Muscle cells specialized for aerobic respiration provide endurance, and those specialized for lactic acid fermentation support short but intense energy expenditures. Both ways of making ATP play critical roles in life on earth. Q: What exposure risk comes with aerobic respiration? Choices: - helium toxicity - carbon toxicity - nitrogen toxicity - oxygen toxicity A:
(A).
oxygen toxicity
Ques:Answer the following question given this paragraph: Composite volcanoes are also called stratovolcanoes. This is because they are formed by alternating layers (strata) of magma and ash ( Figure below ). The magma that creates composite volcanoes tends to be thick. The steep sides form because the lava cannot flow too far from the vent. The thick magma may also create explosive eruptions. Ash and pyroclasts erupt into the air. Much of this material falls back down near the vent. This creates the steep sides of stratovolcanoes. Q: What is in danger of happening when thick magma is formed? Choices: - focused eruptions - continuous eruptions - earthquakes - explosive eruptions A:

Ans:explosive eruptions
Answer the following question given this paragraph: A familiar example may help you understand the vibrating electric and magnetic fields that make up electromagnetic waves. Consider a bar magnet, like the one in the Figure below . The magnet exerts magnetic force over an area all around it. This area is called a magnetic field. The field lines in the diagram represent the direction and location of the magnetic force. Because of the field surrounding a magnet, it can exert force on objects without touching them. They just have to be within its magnetic field. Q: A magnet can exert force on objects without touching them, as long as they are within what? Choices: - audio field - molecular field - gravitational field - magnetic field A:
magnetic field