题目

向某氯化钡溶液中，逐滴滴入密度为1.28克/ 厘米3的硫酸溶液，恰好完全反应时，过滤，测得滤液的质量恰好与原氯化钡溶液的质量相等。求硫酸溶液的质量分数和物质的量浓度。 答案：解析：设所加硫酸溶液中含有1 mol H2SO4，则加入氯化钡溶液中产生BaSO4的物质的量也为1 mol，质量为233 g，等于加入的硫酸溶液的质量。硫酸的质量分数=×100%=42.06%硫酸的物质的量浓度==5.49(摩/升)。答案：该硫酸溶液的质量分数是42.06%，物质的量浓度为5.49摩/升。Is there someone you hate? Well, maybe you don’t really hate them. But you get really angry every time you think of them. If you don’t let this anger go, it can turn into bitterness .Bitterness appears when we can’t forgive someone who has hurt us or made us angry. Someone might say or do something that hurts us. But instead of controlling the anger, we keep it deep inside. Before long, a bitter feeling begins to grow. We may think we’re hurting that person by criticizing him or her often, but we’re really only hurting ourselves.Bitterness can not only lead to serious health problems such as heart disease, but also hurt our relationships with friends and family members. No one enjoys being around an angry person for very long.If you see bitterness in your life, here are some ways to deal with it.Accept itInstead of trying to deny your anger, make it clear to yourself and accept it. See your anger for what it is and quickly deal with it.Stop making excuses for itYou may feel you have a right to be angry. You may think you’re right and the other person is wrong. You may even secretly enjoy making the other person look bad. But in the end, bitterness hurts you much more than the other person. The bitterness will hold you back, and the other person will go on with his or her life.Forgive and forget itYou probably can’t completely put the anger out of your mind. But you can decide to forgive the other person. Forget it and move on. You’ll enjoy better health and peace of mind.1.According to the passage, we might get angry when someone __________.A. holds us back B. forgets usC. doesn’t like us D. does hurt us2.The underlined word “deny” in the passage means “__________”.A. 误解 B. 否认 C. 疏远 D. 减轻3.The best way to deal with the bitterness is to __________.A. make the person who hurts us look badB. hate the person who hurts us very oftenC. accept that you are hurting the other personD. forgive the person who hurts us and forget it4.What can we learn from the passage?A. We should enjoy someone who hurts us.B. We should pay more attention to our friends.C. The peace of mind is more important than the hurt itself.D. It’s better to let bitterness go along with the other person.