Quiz Instructions this Lab Background quiz by 11:59 PM the day before your schedules:lib meeting. We want you la understand all of the Information in the background, so we are giving you multiple chances to get it right.There are no late submissions or "make-up" quizes. Question 3 What is unique about the water used in this week's investigation? It must be chiller before wecan une it It does not contain ions. It is botted spring water II must be heated before weranuse t 1 pts

22. When sugar is mixed with water equilibrium is reached when molecules of sugar stop moving the dissolved sugar molecules are evenly distributed throughout the

For which of the properties would aluminum have a greater value than gallium? 1. Atomic radius 2. Ionic radius 3. Electronegativity 4. Ionization energy

1A. Which of the following is most likely a significant cause of the general trend indicated by the graph? A. Reduction of ozone concentration in the upper atmosphere B. Reduction in size of polar ice caps C. Increase in energy output of the sun D. Increase in evaporation of ocean water E. Increase in consumption of fossil fuels 1B. Based on the results of the graph, which oceanic changes will be observed? A. pH will decrease, but the ocean will remain basic B. pH will increase and the ocean will become more basic C. pH will decrease and the ocean will become acidic D. pH will not significantly change 2A. When "strong," these dissociate completely in solution. A. Acid B. Base C. Both 2B. Is a proton-donor when dissolved in solution. A. Acid B. Base C. Both 2C. A solution with a pH greater than 7, up to 14. A. Acid B. Base C. Both 2D. A solution that contains more hydronium ions $(H3O+)$ than hydroxide ions $(OH-).$ A. Acid B. Base C. Both

Actinct Series" 2511 (252) in ud can in 1953.John Newlands presented a paper, classifying the 56 discovered elemerts into 11 groups based on similar physical properties. He noted that pairs of similar elements existed which differed by some multiple of eight in atomic weight. In 1884 Newlands published his version d the periodic table and proposed the Law of Octives stating that any given element exhibits analogous behavior to the eighth element following it in the table. Dimitri Mendeleev noticed patterns in the properties and atomic weights of halogens, alkali metals and alkaline metals. He also observed similarities between the series Cl-K-Ca, Br. Rb-Srandi-Cc-Ba. In an effort to extend this pattern to other elements, Mendeleev created a card for each element.containing the element's symbol atomic weight, and chemical and physical properties. As Mendeleev arranged the cards in order of ascending atomic weight, grouping elements of similar properties together, the periodic table was formed. Although Mendelee/s table demonstrated the periodic nature of elements.during the next century.scientists accurately explained why the properties of the elements recur periodically. Rutherford discovered nuclear charge and this charge, later termed the atomic number, was used to rumber the elements within the periodic table. Finally variations of the same elements, or isctopes having the same number of protons and electrons but differing numbers of neutrons, were discovered. How did later discoveries change the model of Mendeleev's periodic table to what we accept today? A Mendeleer's periodic table was labelled as inaccurato and his founding principles were scrapped B Elemeris were arranged by atomic number and properties of the elements vaned periodically with atomic number. C Write elemeris are arranged by atomic mass number, known familles of elements are organized by electron number D Elemerts vere arranged by the mass number of the nucleus and properties of thelements varied periodically with mass.

This question refers to the chemical structure of sugar fructose. Name the organic molecule that has this structure. Nucleic acid Lipid ) Protein Carbohydrate $CH_{2}OH\\ HO^{-}-O\\ H-C-OH\\ H-C-OH\\ H-C-OH\\ -CH_{2}OH$

Question 7 Match the definition with the correct term about the atom in relation to the periodic table. number of protons in the nucleus of an $\square $ atom [Choose] [Choose] total number of protons and neutrons in mass number the nucleus of an atom atomic mass atomic number $\square $ weighted, average mass of all isotopes of a naturally occurring element 1 pts

Properly identify the following ions (some answers will be used twice and some answers will not be used at all) magnesium $\square $ phosphate $\square $ ammonium $\square $ chloride $\square $ iron (III) $\square $ perchlorate $\square $

have gone into the field to take water samples from lakes in your town. note the following observations: Lake A contained many fish swimming in its waters. Lake B had very few fish swimming in its waters, and a few dead fish floating on the water. u return to your lab and take pH readings for each mple. Think about how acids and bases would affect the water quality in the two lakes. Which set of pH data would you expect to see based on your observations? Lake A: $pH=4.5$ Lake B: $pH=7.5$ Lake A: $pH=8.3$ Lake B: $pH=3.7$ Lake A: $pH=6.6$ Lake B: $pH=6.8$ Lake A: $pH=10.2$ Lake B: $pH=1.7$

A buffer consists of a weak acid and its conjugate hase in the same solution. Match the weak acid-conjugate base pairs that could be used to make a buffer. (Carvat does not show subscripts HCOOH $\square $ [Choose] $HC2H3O2$ $\square $ : HCN [Choose] H2O $NaCOOH$ $NaC2H3O2$ $NaOH$ $HCl$ $HaCN$ Question 9 aspts

${}_{2}^{4}He$ How many protons does He have? a b b C 2 d 6