Ques:Q: The strength of an acid depends on how many of which ions it produces when it dissolves in water? Read this paragraph and choose the correct option from the provided answers: The strength of an acid depends on how many hydrogen ions it produces when it dissolves in water. A stronger acid produces more hydrogen ions than a weaker acid. For example, sulfuric acid (H 2 SO 4 ), which is found in car batteries, is a strong acid because nearly all of it breaks down into ions when it dissolves in water. On the other hand, acetic acid (CH 3 CO 2 H), which is the acid in vinegar, is a weak acid because less than 1 percent of it breaks down into ions in water. Choices: - silicon - carbon - helium - hydrogen A:

Ans:hydrogen
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Ques:Q: Does blood flow increase or decrease when blood vessels constrict? Read this paragraph and choose the correct option from the provided answers: When a blood vessel constricts, less blood can flow through it. Choices: - it's not affected - increases - it stops - decrease A:

Ans:decrease
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Ques:Q: What makes breathing difficult due to respiratory system disease? Read this paragraph and choose the correct option from the provided answers: respiratory system disease in which air passages of the lungs periodically become too narrow, making breathing difficult. Choices: - weak lungs - slippery air passages - water in the lungs - narrow air passages A:

Ans:narrow air passages
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Ques:Q: What do we call coiled structures made of dna and proteins? Read this paragraph and choose the correct option from the provided answers: Chromosomes are coiled structures made of DNA and proteins. They form after DNA replicates and are the form in which the genetic material goes through cell division. Chromosomes contain genes, which code for proteins. Choices: - nodes - Organisms - Molecules - chromosomes A:

Ans:
chromosomes
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