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
Since an element always has a different number of protons, the mass can indicate how many protons are in an isotope. TRUE FALSE
What is the value of the gas constant R, in units of $\frac {L-atm}{mol\cdot K}$ ? Report the value with at least three significant figures. Type answer: $\square $
Which equation is correctly balanced? $2K+Br2\rightarrow 2KBr$ $K+Br2\rightarrow 2KBr$ $2K+2Br2\rightarrow 2KBr$ $K+2Br2\rightarrow 2KBr$
Elements that form diatomic molecules include __
How many different types of subshells are there? 1(s) $5(s,p,d,f,z)$ $4(s,p,d,f)$ $3(s,p,d)$
Choose the formula for phosphate. a $PO_{4}^{3-}$ b $PO_{4}$ c $HPO_{4}^{2-}$
25. Write the Lewis structure for each element. (a) I (b) S (c) Ge (d) Ca
In art class students are mixing black and white paint to make gray paint. Sarah mixes 4 cups of black paint and 1 cup of white paint. Kayden mixes 5 cups of black paint and 2 cups of white paint. Use Sarah's and Kayden's percent of black paint to determine whose gray paint will be darker. Answer Attemptiout of 5 $Sarah's\quad percent\quad of\quad black\quad paint\quad (to\quad nearest\quad whole\quad number)=\square \% $ $Kayden's\quad percent\quad of\quad black\quad paint\quad (to\quad nearest\quad whole\quad number)=\square \% $ Sarah's gray paint will be darker. Kayden's gray paint will be darker. The two gray paints will be equally dark.
The electron configuration of nitrogen (N) is $1s^{2}2s^{2}2p^{3}$ th $1s^{2}2s^{2}2p^{4}$ $1s^{2}2s^{2}2p^{5}$ $1s^{2}2s^{2}2p^{6}$
How many valence electrons does lithium (Li) have available for bonding? 12 12 14
