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.
How many oxygen molecules are needed to finish balancing the following equation? C_(4)H_(10)O+ldots O_(2)arrow 5H_(2)O+4CO_(2) 5 6 8 3 7
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)
10. Which types of bonds tend to have the highest bond energy? 11. Which types of bonds tend to have the lowest bond energy?
4 7 Add an answer item! Add an answer item! Answer Bank carbon iodine
10. What is the mole ratio of $MgCl_{2}$ to HCI $\underline {\quad }:\underline {\quad }$
Which action effectively increases the reactant concentration and increases the reaction rate? decreasing pressure heating the reactant mixture increasing pressure cooling the reactant mixture
Matter can undergo physical or chemical changes. Which of these are examples of chemical changes? Select TWO correct answers. A. Freezing water B. Milk souring C. Iron melting D. Dry ice sublimating E. Cooking an egg
What is the most common substance found in ecstasy? rat poison tar glass nicotine
Which action would speed up the reaction for the chemical reaction $CH_{3}Br+OH^{-}\rightarrow CH_{3}OH+Br^{-}$ increasing the $CH3Br$ concentration reducing the $OH-$ concentration cooling the reactant mixture reducing the pressure of the reactant mixture
Which action decreases the activation energy of a reaction? decreasing the temperature removing reactant molecules removing a catalyst adding a catalyst
Convert 89000 g $Pb(NO_{3})_{2}$ to atoms
Given the following reactions and corresponding $\Delta H$ values, find the $\Delta H$ (to the nearest whole \#) for the reaction: $H_{2}SO_{4}(l)\rightarrow SO_{3}(g)+H_{2}O(g)$ $H_{2}S(g)+2O_{2}(g)\rightarrow H_{2}SO_{4}(l)$ $\Delta H=-235kJ$ $H_{2}S(g)+2O_{2}(g)\rightarrow SO_{3}(g)+H_{2}O(l)$ $\Delta H=-207kJ$ $H_{2}O(l)\rightarrow H_{2}O(g)$ $\Delta H=44kJ$ $\square $
