Acid Reactions & Salts

Question 1

Which of the following pieces of evidence best supports the claim that the digestive system and the circulatory system work together to deliver nutrients to body cells?

Accepted Answer

Glucose absorbed in the small intestine enters the bloodstream and is carried to cells throughout the body.

Answer

The heart pumps oxygen‑rich blood from the lungs to the rest of the body.

Answer

The stomach releases hydrochloric acid to break down proteins into peptides.

Answer

The kidneys remove excess water and waste products from the blood before it returns to the heart.

Question 2

Which statement best explains how the muscular and circulatory systems work together during a sprint, using evidence from the body’s response?

Accepted Answer

When a student sprints, the muscles need more oxygen, so the heart beats faster and the circulatory system pumps more oxygen‑rich blood from the lungs to the working muscles.

Answer

When a student sprints, the muscles contract, causing the nervous system to send signals that stop breathing, conserving energy for the sprint.

Answer

When a student sprints, the muscles produce waste, so the digestive system removes the waste, allowing the muscles to keep moving.

Answer

When a student sprints, the muscles need more oxygen, so the respiratory system alone supplies oxygen directly to the muscles without the circulatory system.

Question 3

When a piece of magnesium metal is put into dilute sulphuric acid, which word equation correctly represents the reaction?

Accepted Answer

magnesium + sulphuric acid → magnesium sulphate + hydrogen

Answer

magnesium + sulphuric acid → magnesium sulphide + oxygen

Answer

magnesium + sulphuric acid → magnesium oxide + water

Answer

magnesium + sulphuric acid → magnesium hydroxide + hydrogen

Try three questions

Which of the following pieces of evidence best supports the claim that the digestive system and the circulatory system work together to deliver nutrients to body cells?

Which statement best explains how the muscular and circulatory systems work together during a sprint, using evidence from the body’s response?

When a piece of magnesium metal is put into dilute sulphuric acid, which word equation correctly represents the reaction?

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