Which phrase does not describe a mineral?
A. Crystal structure B. Organic solid C. Specific chemical composition D. Naturally occurring
B- organic solid
A mineral is always an inorganic solid
all other three are right
Which phrase does not describe a mineral? A. Crystal structure B. Organic solid C. Specific chemical composition D. Naturally occurring
5. A(n) ______________ is a naturally occurring solid, usually inorganic, with a definite, only slightly variable chemical composition and an ordered atomic structure. isotope rock molecule mineral
Which of the following is a naturally occurring polymer? Select one: a. nylon b. perspex c. polyurethane d. silk e. terylene
Q6. HOCH2CH2OH(s) is classified as a/an: A. metallic crystal. B. covalent solid. C. molecular crystal. D. amorphous solid. Q7. Magnesium oxide, MgO, melts at 2,800°C and is very hard. The liquid conducts electricity very well. What kind of crystal is this? A. Ionic Crystal B. Covalent Crystal C. Metallic Crystal D. Molecular Crystal Q8. Which one of the following substances will have both dispersion forces and dipole-dipole forces? A. HC B . Br2 D. H2 E. CO2 Q9. W(s) is classified as a/an A. metallic crystal. B. covalent...
3. An alloy of copper and gold has the structure shown in the figure (a=D=C =3.77 Å, and a=B=y=90 degrees). Calculate the composition of the cell. Given that 24-carat gold is pure gold what carat does this alloy represent? What is the density of the crystal in grams/cm'?
2. [20pt] Consider the temperature-composition phase diagram shown below, which represents a solid-liquid equilibrium based on a (liquid) mixture of A and B at high temperature. Temperature, T DY 0.16 0.23 0.57 0.67 0.84 0.2 0.8 0.4 0.6 Mole fraction of B, XE (a) Label all regions of the diagram according to the chemical species exist in that region and their phases. Be precise the composition of solid formed. (10pt) (b) Indicate the number of species and phases present at...
6. Which statement(s) describe the chemical structure above? Select one or more: a. This is a nucleotide b. This is found in DNA c. This is a pyrimidine d. This is found in RNA e. This is a purine HO OH OH OH
a) Write the chemical equation for solid lead(II) bromide in equilibrium with its ions. b) Write the corresponding equilibrium constant expression. c) What specific name is given to the equilibrium constant expression for relatively insoluble salts? d) Explain why the solid lead(II) bromide is not used in this equilibrium constant expression. When an ionic compound dissolves in water, the individual ions first leave the crystal lattice and then each ion becomes surrounded by a cluster of polar water molecules. What...
Draw the structure of organic compounds B, C, and D. Show stereochemistry where applicable.
A copper-nickel alloy of composition (40% Ni-60% Cu) is slowly heated from a temperature of 1200°C: 1. a) At what temperature does the first liquid phase form? b) What is the composition of this liquid phase? c) At what temperature does complete melting of the alloy occur? d) What is the composition of the last solid remaining prior to complete melting? Composition (at% N) 100 0 1600 2800 1500 1453°C Liquid 2600 Soldus line Liquidus line 1300 - 2200 120아ㅡㅡㅡㅡㅡ...
38) Which of the following occurs naturally as nonpolar diatomic molecules? A) sulfur B) argon C) chlorine D) all of the above E) none of the above 39) Aspartic acid is an amino acid used to synthesize proteins. How many lonc pairs of electrons need to be added to complete the aspartic acid structure shown below? A) 11 B) 9 096 D) 8 E) 4 40) The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is A) 4 B) 3...