Chapter 1, Problem 1.108E

Correct the following statements.a. An element is a combination of two or more compounds.b. When a small amount of sugar is completely dissolved in water, a heterogeneous solution is formed.

The required volume of 28.0 (w/w) % ammonium hydroxide (density =0.899g/mL) diluted it up to 500.0 mL to make 0.250 M NH3 (NH3 RMM=17.03 g/mol) is a. 7.62 mL b. 23.67 mL c. 8.46 mL d. 10.56 mL

The physical basis for life is the carbon atom. This atom   a. is more abundant than silicon.   b. is capable of forming long, complex, stable chains that extract, store, and use energy.   c. can replicate itself in a variety of environments.   d. releases energy when it bonds with other elements, thus providing the necessary requirements to sustain the organism.   e. does all of the above.

Evidence of a chemical reactions is anything that shows... A.a change in the state of matter B. interaction between 2 gases C. a new substance has formed D. a solid dissolved in a liquid

12. Distinguish between filtration and centrifugation. 13. Silver is a substance which expands on melting; so, its melting point when pressure is raised. 14. Give an example each for solid-liquid and solid- solid types of a homogenous mixture. 15. The atomicity of the element phosphorus is 16. is the method of separating heavier fat particles of milk from lighter water. 17. A metal “A" reacts with a metallic chloride of "B" to give metal "B." But metallic chloride of “A" cannot give metal "A" on reaction with metal "B." What conclusion can you draw from this?

What is the volume of 1.80 M NaCl solution that can be prepared by the dilution of a 50.0 mL of brine solution containing 32.0 wt% NaCl? (Assume the density of a brine solution is 1.10 g/mL and formula mass of NaCl=58.4 g/mol) a. 6.03 mL b. 167 mL C. 301 mL d. 438 mL

2 MOLARITY ONLY

3. Which of the following processes is best described as a chemical change? Upon heating, mercury (II) oxide forms mercury metal and exygen gas. A Evaporation of rubbing alcohol. Deposition of iodine vapor on a surface. d. Grinding rock salt. c.

C3H3 + O2→ b СО2 + H2O d a The chemical in the pink box is a... A. subscript В. соefficient C. reactant D. product The number in the green box is a... A. subscript B. coefficient C. reactant D. product The numbers in red boxes are... A. subscripts B. coefficients C. reactants D. products The chemicals in the purple box are... A. subscripts B. coefficients C. reactants D. products