20. Which of the following is heterogeneous? a. Sodium Chloride b. Aluminum c. Granite d. Carbon Dioxide
Sort the following properties of sodium into physical and chemical. Items (6 items) (Drag and drop into the appropriate area below) square square square
What is the mass of 4.32 mol Gal_(3) 455 g 1,230 g 1,720 g 1,950 g
Which of these safety rules is MOST important to remember in chemistry class? (Hint...think about lab rules from brick and mortar classes and what would keep you safe!) Wear closed-toe shoes and goggles when needed Run to your lab station to be first Bring your lunch into the lab for long experiments Always taste chemicals to identify them
What makes isotopes of the same element different? number of neutrons number of electrons number of protons atomic number
The work bench in the lab should include Materials needed for the experiment Phone, keys, and backpack Chemicals with no labels Materials from the previous lab
Which of these safety rules is MOST important to remember in chemistry class? (Hint __ think about lab rules from brick and mortar classes and what would keep you safe!) Wear closed-toe shoes and goggles when needed Run to your lab station to be first Bring your lunch into the lab for long experiments Always taste chemicals to identify them
C+Darrow CD (Delta G=11kcal/mol) What would be the Delta G value (kcal/mol) of the coupled reaction? (couple it to the Xarrow Y reaction above) Only type the Delta G value (number) in the answer blank, do not add any units or anything else. square
How many protons are in the nucleus of an atom with an atomic number of 15? (type the integer, do not spell out the number; example: 2) square
__ 2. What is the dependent variable? A) the number of colors B) the amount of sodium bicarbonate C) the amount of calcium chloride D) the amount of universal indicator
During brazing, which of the following may present health hazards? Zinc Beryllium Cadmium or phosphorus All are correct
Which particles determine the affinity of atoms to each other and thus the likelihood of a chemical reaction? Protons Neutrons Electrons Nucleus
Get It? Explain how the ion $HCO_{3}^{-}$ can be both an acid and a base. Describe what happens in the forward and reverse reactions when ammonia is dissolved in water. Identify the conjugate acid, the conjugate base, and the two conjugate acid-base pairs.
Write the net ionic equation between $Cr_{2}(SO_{4})_{3}(aq)$ and $Ba(OH)_{2}(aq)$ Be sure to include the states of matter. $\square $
Sequence the following equations in the steps of the ionization of phosphoric acid in the correct order. $HPO_{4}^{2-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+PO_{4}^{3-}(aq)$ $H_{3}PO_{4}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+H_{2}PO_{4}^{2-}(aq)$ $H_{2}PO_{4}^{-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+HPO_{4}^{-}(aq)$
When a halide leak detector is used, what color will a blue flame turn when it comes in contact with leaking refrigerant vapors? A. blue B. green C. white D. orange
What kind of Isomers are 1-butene and 2-butene (pictured above)? stereoisomers structural isomers geometric isomers not isomers
Write the balanced NET ionic equation for the reaction when $Cr(NO_{3})_{3}$ and $Li_{2}CO_{3}$ are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
What type of elements are the lanthanides and actinides? a mostly nonmetals and a few metals b mostly metals and a few nonmetals C all nonmetals d all metals
Describe what happens in the forward and reverse reactions when ammonia is dissolved in water. Identify the conjugate acid, the conjugate base, and the two conjugate acid-base pairs.
