Chemical composition of cement — task. Science State Board, Class 6.

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Fill in the blanks with correct answers:

(Note: write only one letter in each box.)

1. __________ is added to cement as it controls the hardening rate when cement is mixed with water.

i i i i i i

2. __________ is the chemical present in cement which prolongs the setting time when added in excess.

i i i i i i i i i i i i i i

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2. Chemical composition of cement