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
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 major ion in seawater? sodium chloride magnesium sulfate
5. How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00 ? (A) By diluting the solution with distilled water to a total volume of 200 mL (B) By diluting the solution with distilled water to a total volume of 1.00 L (C) By adding 100 mL of 0.10 MHCI (D) By adding 100 mL of 0.10 MNaOH
12. How does the concept of electron transfer explain why sodium and chlorine react to produce sodium chloride?(Hint: Think about the movement of electrons between sodium and chlorine atoms during the reaction.)
2. Use Passage 1 to answer question below. Suppose that in Experiment 2 a solution at a pH of 7.5 had been tested. Based on the results of Experiment 2, the percent recovery of cadmium for that solution would most likely have been: F. between $48\% $ and $80\% $ G. between $80\% $ and $88\% $ H. between $88\% $ and $95\% $ J. between $95\% $ and $100\% $ F G. H. J.
1.Use Passage 1 to answer question below. Based on the description of Experiment 1, when was the graphene separated from the sample liquid by centrifugation? A. Immediately before placing the sample in the water bath B. Immediately after removing the sample from the water bath C. Immediately before the percent recovery of the cadmium was determined D. Immediately after the percent recovery of the cad- mium was determined A B C D
Which statement about asbestos fibers is correct? A. All asbestos fibers are visible without magnification B. Asbestos fibers can be identified by color and texture alone C. Some asbestos fibers are extremely small and require laboratory testing to confirm their presence D. Asbestos fibers are always thicker than a human hair
Which of the following statements describes how water differs greatly from many other substances? It is less dense in its solid form than liquid form. It is a polar covalent molecule. It can change to solid liquid and gas phases. It is comprised of two different elements.
Name the following ionic compounds. Make sure you are in text mode $(''Tt'')$ Do NOT put a space between metal and charge in parentheses if naming a Type II metal ionic compound (i.e. iron(III)) a. $CoCl_{2}$ $\square $
3. How many grams of $Fe_{2}(SO_{4})_{3}$ will be produced from 4.25 moles of Fe? $2Fe+3H_{2}SO_{4}\rightarrow 1Fe_{2}(SO_{4})_{3}+3H_{2}$
Red litmus paper turning blue indicates the prescence of __ ? $Ni(II)$ $Ca(II)$ $Fe(III)$ Ammonium Ion
