Name: ___________________________________ Date: ______________ Practice Test #3 ____ 1. When a precipitation reaction occurs, the ions that do not form the precipitate A) evaporate B) are cations only C) form a second insoluble compound in the solution D) are left dissolved in the solution E) none of these 2. An aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. The complete ionic equation contains which of the following species (when balanced in standard form)? A) B) C) D) E) ____ 3.
2. Given when you have learned about the hydrogen bonding shared between nucleic acids in DNA, which pair is more stable under increasing heat: adenine and thymine, or cytosine and guanine? Explain why. 3. Which of the following is not an organic molecule; Methane (CH4), Fructose (C6H12O6), Ethanol (C6H12O), or Ammonia (NH3)?
Place tubes on ice. 4. Use a sterile plastic inoculating loop to transfer one or two large colonies of E. coli cells from the starter plate to the +BLU tube. a) Be careful not to transfer any agar from the plate along with cell mass. b) Immerse loop tip in calcium chloride solution, and vigorously tap against wall of tube to dislodge cell mass.
Yes Do covalent compounds conduct electricity as: (3 points) Solids? No Liquids? No Aqueous solutions (when the covalent compounds are dissolved in water)? No 03.06 Covalent Bonding and Lewis Structures: Lab and Rubric Before You Begin: You may either copy and paste this document into a word processing program of your choice or print this page. Part I: Lab Insert completed data tables for each part of the lab.
Hypothesis: If bacteria with + pGLO plasmids that are resistant to the antibiotic ampicillin and have the gene for GFP, colonies with survive and grow on the transformation plates that have LB/ amp. In addition, + pGLO bacteria on a plate with LB/amp/ara will grow and glow green under UV light because of the inclusion of arabinose. In the control plates, -pGLO bacteria that are amp sensitive will not be able to grow on the LB/ amp plates. The other control plates with – pGLO bacteria and no ampicillin added will host a lawn of colonies. IV.
Based on this result, what biological molecules are present in the white grape juice? Benedict’s solution can be used to distinguish between monosaccharides and disaccharides. Why? Benedict’s solution cannot be used to distinguish between two monosaccharides. Why?
Experiment 2 - Lab Report Characterization of Phosphatase Activity in a Crude Alfalfa Sprout Extract 1. (6pts) Construct two separate bar graphs depicting your results for the effect of pH and temperature on phosphatase activity. All figures/graphs/tables must include appropriate titles, legends, labeled/ scaled axes, and standard deviation bars. Do not include a figure caption. *see attached* 2.
2) Define weighted average- An average that takes into account the proportional relevance of each component, rather than treating each component equally. 3) Place one atom of each isotope on the scale. Divide the mass by 3 to fine the straight average. How is this number different from your average atomic mass? Number – 19g average mass 1.7g 4) If a 4th isotope of beanium, D (green), were added to the pool, how would the average atomic mass change?
Which of the following is a trace element that is required by humans and other vertebrates? A) nitrogen B) calcium C) iodine D) sodium E) phosphorus 3) Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom's nucleus? A) atomic mass B) atomic weight C) atomic number D) mass weight E) mass number 4) Calcium has an atomic number of 20 and an atomic mass of 40. Therefore, a calcium atom must
Page 1 Hom ework Unit B – Subm it your answers via D2L 1. Which is not an ionic compound? A) KCl B) Ca(NO 3 ) 2 C) CBr 4 D) AlBr 3 2. Which is not a covalent compound? A) Br 2 B) NO 2 C) NH 3 D) NaNO 2 E) More than one of the compounds above is not a covalent compound.