What is the mass number of a potassium (K) atom that has 20 neutrons? The mass number is __ Blank 1: square
__ is used as a decolorizing agent in the Anthony Method of capsule staining Copper sulfate Water 95% Alcohol 91% Isopropanol
What is the correct formula for calculating molar mass? Molar mass=Massdiv Moles Molar mass=Molesdiv Mass Molar mass=Volume+Density Molar mass=Molestimes Avogadro's number
Which of the following rules is applicable for balancing a chemical equation? Change only the coefficients Add the coefficients and change the subscripts Change only the subscripts Change the coefficients and the subscripts
A gas is cooled from 365 K to 285 K while its volume changes from 12.8 Lto 9.9 L The initial pressure of the gas is 1.9 atm. What is the final pressure of the gas rounded to the nearest tenth? 1.3 atm 2.9 atm 1.9 atm 9.9 atm
What happens to a material if it's dissolved in a solvent? The solute bonds to the solvent, forming new compounds. The solvent is split into its ions. The solute is split into its ions. The solute disappears forever.
The number of moles present in 180 grams of hydrochloric acid is approximately __ 4.75 5.00 4.25 4.50
One mole of copper has a mass of 63.5 grams. Approximately how many atoms of copper are present in one mole of copper? 63 atoms 64 atoms 32times 10^23atoms 6times 10^23atoms
What is the total pressure in a 10.0 Lflask which contains 0.127 mol of H_(2)(g) and 0.288 mol of N_(2)(g) at 20.0^circ C 0.681 atm 0.306 atm 0.998 atm 0.693 atm
What is the final,balanced equation for this reaction? 2Cr^3+(aq)+6Cl^-(aq)arrow 2Cr(s)+3Cl_(2)(g) 2Cr^3+(aq)+2Cl^-(aq)+6e^-arrow Cl_(2)(g)+2Cr(s) Cr^3+(aq)+6Cl^-(aq)+3e^-arrow 2Cr(s)+3Cl_(2)(g) Cr^3+(aq)+2Cl^-(aq)arrow Cr(s)+Cl_(2)(g)
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.
