初三科学：上册第一章酸碱中和 (pg7)

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初三科学：上册第一章酸碱中和 (pg7)

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7 questions

Q.

将酸逐渐滴入锥形瓶中含有酚酞的碱溶液中，溶液逐渐从粉红色变成什么色？

1

30 sec

Q.

逐渐将酸滴入锥形瓶的碱溶液中，锥形瓶内溶液pH值有何变化？

2

30 sec

Q.

酸与碱发生反应，产生盐和水的化学变化，称为什么反应？

3

30 sec

Q.

酸与碱中和时，溶液的温度是升高还是降低？

4

30 sec

Q.

酸碱中和是一个吸热反应还是一个放热反应？

5

30 sec

Q.

氢氧化钠与盐酸混合发生中和反应，将生成什么？（请用中文名称回答）

6

30 sec

Q.

7

60 sec