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Calculate mass X in Table 2 Mass X = - AQA - GCSE Chemistry Combined Science - Question 3 - 2018 - Paper 2
Question 3
Calculate mass X in Table 2 Mass X =
Worked Solution & Example Answer:Calculate mass X in Table 2 Mass X = - AQA - GCSE Chemistry Combined Science - Question 3 - 2018 - Paper 2
Step 1
Calculate mass X in Table 2
Answer
To find mass X for the river water, we can use the data from the table. We know that the mass of dissolved solids in 5 cm³ of river water is 0.08 g. From the table, we also know that the dissolved solids in 1000 cm³ of river water can be found with the following conversion:
Given:
- Mass of dissolved solids in 5 cm³ = 0.08 g
We can set up a proportion to find out how much would be in 1000 cm³:
X = 0.08 ext{ g} imes rac{1000 ext{ cm}^3}{5 ext{ cm}^3} = 16 ext{ g}
Thus, the mass X is 16 g.
Step 2
Step 3
Describe the difference between potable water and pure water.
Answer
Pure water is defined as having no dissolved solids or impurities and typically does not contain chlorine. Potable water, on the other hand, is safe for drinking and may contain dissolved solids or impurities, including chlorine to ensure safety.
Step 4
Describe how groundwater and sea water are treated to produce potable water.
Answer
Groundwater is treated through filtration to remove particulates and sterilized to kill any harmful microorganisms. In contrast, sea water undergoes a process of distillation or reverse osmosis to remove salt and other impurities, making it safe for drinking.
Step 5
Calculate the mass of the dissolved solids in a 6.50 g sample that is 2.2%.
Answer
To calculate the mass of dissolved solids in a 6.50 g sample, we can use the percentage formula:
Mass of dissolved solids = Total mass × (Percentage of dissolved solids / 100)
Substituting the values:
ext{Mass of dissolved solids} = 6.50 ext{ g} imes rac{2.2}{100} = 0.143 ext{ g}
Thus, the mass of dissolved solids is 0.143 g.