Science Exam Class 6.docx

‫بسم هللا الرحمن الرحيم‬

‫الجمهورية اليمنية‬ ‫وزارة التربية والتعليم‬

Subject:---------Science--------Name:-----------------------------Class:---------------6-----------------

 First question: Define the following: Neutralization: Astronomers:

 Second question: Write true (T) or false (F) a. b. c. d. e. f. g. h. i. j.

1

Acids have a sour taste ( ) Lemons and oranges contain hydrochloric acid ( ) All acids are corrosive ( ) Alkalis are found in cleaning products ( ) Acids and alkalis are chemical opposites ( ) An indicator changes color in acids but not alkalis ( ) Acids have a PH above 7 ( ) Antacids are used to neutralize acid in the stomach ( ) The earth rotates around its axis once a day ( ) The planets orbit the sun ( )

‫مدارس العز االهلية‬

 Third question: Fill in the blanks: a. b. c. d. e. f. g. h. i.

Litmus turn color to ……………….. in acid, and ……………….. in water. A strong acid has a PH of …………, and a strong alkali has a PH of ……….. A universal indicator turns color to ……………. in sodium hydroxide. ……………….. and …………………. react together to form a neutral solution. The earth is rotating around its axis from ………………. to ……………….. Jupiter and Mars are …………….. Stars appears only at night because of the ……………………………….. The solar system is made up of …………………., …………………….., and ………………. ……………….. and …………………… are rocky planets, while ……………….. and ……………………… are gas giants. j. planets are not sources of light , but we still see them because they ……………………. sunlight to our eyes k. The sources of light in the solar system is …………………

 Fourth question: a. Why do we see different constellation at different times of the year?

2

b. What is the differences between litmus and universal indicators?

c. List two ways to use neutralization in our lives?

3