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
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 $
Convert $4.68\times 10^{25}$ atoms $PBr_{3}$ to mol
Which of the following best describes a mixture? a material that is made up of many molecules a substance that can be changed into another substance a material that contains two or more substances a substance that has been broken down into Its smallest parts
What is used to of a hope of sixes in a a compound heard on the chermal reme? the periodic table prefixes chemical symbols the IUP AC
40. Using the hyphen form of symbol writing write the name of this atom. ${}_{9}^{19}F^{-1}$
Which of the following will not increase 1 point the rate of a chemical reaction? increasing surface area stirring decreasing the temperature increasing the concentration A __ is a substance that increases the rate of a reaction without being consumed. __ 1 point A(n) __ slows down the rate of a reaction. __ is a substance that 1 point
Use molecular orbital theory to determine the bond order in $H_{2}$ o 2 1 3
What partie should be used for the caygin akan when maning the characal formuls $SO_{2}?$ $\square $ disappointed mono- pent.
What happens to the pH of a buffer solution if it is diluted by adding more water? A) pH increases B) pH decreases C) pH remains the same D) pH becomes 7 E) It depends on the starting volume of the buffer
What is the chemical formula for lead (II)sulfate? $Pb_{3}(SO_{4})_{2}$ $PbSO_{4}$ $Pb_{3}(SO_{3})_{2}$ $PbSO_{3}$
