问题
选择题
用铁片与稀硫酸反应制备氢气时,下列措施不能使氢气生成速率加快的是( )
A.铁片改为铁粉
B.稀硫酸改为98% 浓硫酸
C.对该反应体系加热
D.铁片改为锌片
答案
答案:B
用铁片与稀硫酸反应制备氢气时,下列措施不能使氢气生成速率加快的是( )
A.铁片改为铁粉
B.稀硫酸改为98% 浓硫酸
C.对该反应体系加热
D.铁片改为锌片
答案:B
Hunter and Sally went down the street with their mother. They could buy a pet today. “I cannot wait to see the pets!” Sally said. She wanted a cat. Hunter wanted a frog or a snake. They went into the pet shop. “Look! That rabbit made a hole to hide in,” Sally said. “Look at those two cats,” said Hunter. Their cage was on the floor. The small and brown cats were asleep on each other. Sally leaned over the cage. She wanted a better look. The gold necklace she had around her neck came loose. It fell into the cage. It woke up the cats. “Oh no!” Sally cried. “I lost my necklace! It is in the cage!” Then the shopkeeper came. He opened the cage, and took out the necklace. At last, they bought two cats and took them home.
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