Which of the following measured volumes has the leave uncertainty? 10 mL 10.0 mL

Question

Which of the following measured volumes has the leave uncertainty? 10 mL 10.0 mL 10.00 mL 10.000 mL All values have the same degree of uncertainty. A solution contains the label 0.2 M KNO_3. What is the correct interpretation of this concentration? There are 0.2 moles of KNO_3 in 1.00 mL of water. There are 0.2 moles of KNO_3 in 1000 mL of solution. There are 0.2 g of KNO_3 in 1L of solution. There are 0.2 molecules of KNO_3 in 1/L of solution. There are 0.2 g of KNO_3 in 1 L of water. Which statement about the modern periodic table is FALSE? Elements in the same period share similar chemical and physical properties. Elements are arranged in order of increasing atomic number. A period is a horizontal row of elements A group is a vertical column of elements A stepwise line separates the metals from the nonmetals metals are t the left of the line nonmetal the right of the line.

Explanation / Answer

7) D (as 10.000 ml have more number of significant digits)

8) B ( as 0.2 M KNO3 represents 0.2 moles of KNO3 in 1 litre of solution i.e., 1000 ml of solution)

9) A (as elements in the same group share similar chemical and physical properties but not elements of same period)

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