PRE-LAB QUESTIONS (RESPOND ON A SEPARATE SHEET OF PAPER): 1. Identify the follow

Question

PRE-LAB QUESTIONS (RESPOND ON A SEPARATE SHEET OF PAPER): 1. Identify the following changes as chemical or physical: a. The steak dinner you ate is being digested and used for energy. b. Iron rusts when left in a moist environment, c. Dry ice (solid carbon dioxide) sublimes to form carbon dioxide gas, d. A student drops a 150 mL beaker that breaks into 17 pieces, e. A battery terminal corrodes when battery acid is spilled on the term 2. During filtration, the recommended procedure is to wash the solid three times. Briefly explain nal. why three washings are needed. 3. Why should you use a cool flame when you are heating the solution after filtration? 4. The mass of a mixture of sand, NaCl, and CaCO, is 4.3800 g. After the dissolution of the salt and filtration of the mixture, the filtrate is collected in a beaker with a mass of 50.1007 g. The combined mass of the beaker and dry salt is 51.5857 g. Hydrochloric acid is added to the remaining mixture, and the resulting solution is filtered again o 0.5124 g. Calculate the % of sand, % of NaCl, and the % of CaCO3 in the mixture (show all calculations nto a filter paper whose mass is aper is 2.0824 g. fter the sand is dried, the combined mass of the sand and filter p Be sure to get the report from the course website and complete all sections carefully.

Explanation / Answer

Physical change: A change which does not involve in the change in chemical composition of the substances but only change in physical appearace is called physical change.

Chemical change: A change which involves in the chang of chemical composition or formation new substances is called chemical change.

(a) Chemical change

(b) Chemical change

(c) Physical change

(d) Physical change

(e) Chemical change

2.

To remove the soluble impurities to a maximum extent.

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