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1) Is chalk a mixture

In today’s exercise, you will separate a heterogeneous mixture of salt, sand, and chalk (calcium carbonate, CaCO3).Salt is the
1. 1 answer
2. asked by dd
3. 667 views
A box of chalk weighs 11.5kg. When the box of chalk is a half full of chalk, it weighs 6.5kg. Calculate the weight of chalk only
1. 1 answer
2. 84 views
Chalk contains calcium,carbon and oxygen in the ratio 10:3:12.Find the percentage of carbon in a chalk and in a stick of chalk,
1. 2 answers
2. asked by Ashish
3. 1,023 views
A piece of chalk (CaCO3) has an initial mass of 43.5 grams. The massof the chalk decreased to 39.6 grams after it was used.
1. 1 answer
2. 70 views
A box of chalk and 2 staples cost $10. Three box of chalk and 2 staplers cost $18. Find the total cost of 1 box of chalk and 1
1. 6 answers
2. asked by Anonymous
3. 2,640 views
a box of chalk and 2 staplers costs $10. 3 boxes of chalk and 2 staplers costs $18. find total cost of 1 box of chalk and 1
1. 2 answers
2. asked by tim
3. 540 views
how would you show his problem as a bar modelA box of chalk and 2 staplers cost $10.3 boxes of chalk and 2 staplers cost
1. 2 answers
2. asked by anna
3. 570 views
A piece of chalk (CaCO3) has an initial mass of 43.5 grams. The massof the chalk decreased to 39.6 grams after it was used.
1. 1 answer
2. 74 views
chalk contains 3% of carbon,10%of calcium & 12%of oxygen.find the amount in grams of each of these substancein 1kg of chalk.
1. 1 answer
2. asked by sonam
3. 502 views
There are 3 blue and 4 yellow chalk in the chalk box. Max picks 2 different colors successively without replacing the first one
1. 3 answers
2. 30 views