What is the molecular formula of a molecule that has an empirical formula of CH_(2)O and a molar mass of 120.12g/mol
State the number of valence electrons for each of the following elements. Sn square
What is the term for a pure substance that cannot be broken down any further by ordinary chemical reaction? homogeneous mixture element compound heterogeneous mixture none of the above
Which of the following groups of elements has the highest ionization energy? Group VIIA/17 Group VIIIA/18 Group IIB/12 Group IA/1 Group IIA/2
What is the current official name for element 108? hassium bohrium seaborgium dubnium none of the above
Which of the following is an example of a chemical change? charring sugar cooking a steak baking a pie boiling an egg all of the above
Which of the following is an example of a physical property? physical state melting point color crystalline form all of the above
What is the term for the weighted average mass of all the naturally occurring isotopes of an element? atomic mass atomic notation mass number atomic number none of the above
Which of the following is an inactive ingredient used as an occlusive skin protectant? Glycerin Lecithin Petrolatum Dimethicone
The solute particles that interfere with vaporization are: Select the correct answer below: in the middle of the solution at the surface of the solution in the gas phase none of the above
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.
