True or False? * Qualitative and quantitative data gathered via laboratory experiments is one of the pillars of chemistry. Accurate and repeatable data are essential for good science. * Unused chemicals shouldn't be put back in their original containers to prevent contamination. Never dispense more than is necessary, too a. Statement A is correct and statement B is incorrect. b. Statement A is incorrect and statement B is correct. c. Both statements are correct. d. Both statements are incorrect.

3. A vindictive stockroom worker mixes solid silver nitrate with sand. Write a flow chart describing how you would separate the silver nitrate from the sand. You will need to look up the properties of these two compounds.

Matter is made up of particles that are CONSTANTLY MOVING Determine if the CAPITALIZED WORD(S) make the statement correct. Choose TRUE if it does, choose FALSE if otherwise. A. TRUE B. FALSE

1. A student overheats their beaker during the dehydration of the copper salt, creating black CuO(s) and Cl2 (g). How will this error change the mass of water calculated? Explain. 2. A student overheats their beaker during the dehydration of the copper salt, creating black CuO(s) and Cl2 (g). How will this error change the mass of copper calculated? Explain. You may assume that the student is able to react all of the CuO with the aluminum wire. 3. A student reports an erroneously-high waters of hydration mass but the correct copper mass for their sample. How will this change the mass of chloride calculated? Explain.

Fact, Law, Hypothesis, or Theory? __ An object less dense than the air flies up on its own. __ Atoms make and break chemical bonds by transferring or sharing their valence electrons to satisfy the octet rule. __ A firework is seen to burn with a green flame.

5. TRUE or FALSE a) Chemical reaction is an example of chemical change. b) Rusting of iron shows a chemical reaction. c) Chemical change and physical change are the same.

Question 16 Which one of the following is a physical change? A. CH4(g) + 2O2(g) → 2H₂O(g) + CO2(g) C. H₂O(s)→ H₂O(1) B. Combustion of hydrogen Decomposition of NaN3 D. OA OBOC OD Which pair of elements would you expect to show the greatest similarity in their physical and chemical properties? A. O, S C. K, Ca B. C, N D. H, He OA OBOCOD Question 17

A nutrition table lists apples with a potassium content of 4600 mg/pound. Assume an average apple is 75.0 g, the minimum daily intake for potassium for a healthy adult is 3500. mg per day. Calculate the number of apples per day to meet this requirement for a healthy adult. Assume 454 g = 1 pound. O 7.96 apples per day O 0.126 apples per day O 0.217 apples per day O 4.61 apples per day

Please help me complete question 5 and 6.

Atom of different elements can join together to from a new substance called a