Để xác định hàm lượng NaCl có trong mẫu X người ta tiến hành cân chính xác 2,17g mẫu X. Hoà tan mẫu X vào nước thu được dung dịch Y. Sau đó dùng dung dịch AgNO3 dư để kết tủa hoàn toàn. Lọc lấy kết tủa rửa sạch rồi đem sấy thu được 2,42g. Tính hàm lượng % NaCl có trong mẫu X

Malik formed a hypothesis that an increase in atmospheric oxygen levels by 10% would cause red-legged grasshoppers to grow larger than normal. suppose that malik performs an experiment to test his hypothesis. which of these actions would represent a scientific mistake in his experiment? a. he experiments on live grasshoppers instead of preserved ones. b. he focuses on red-legged grasshoppers instead of all kinds of grasshoppers. c. he varies the nitrogen and carbon dioxide levels in the air from one trial to the next. d. he conducts the experiment in a controlled lab setting with a lab partner. e. he measures the mass and length of his specimens at the start of each trial.