13. How many neutrons are in this isotope? (}_{9)^19F Type a response
Uses organic acid salts that are not abrasive to water pumps, but provide the correct pH Select one: A. Orange Coolant B. Hybrid Organic Acid Technology C. Inorganic Acid Technology D. DEX-COOL
In general, how many unit factors are required to solve a mass-volume stoichiometry problem? one C two three four none of the above
In general, how many unit factors are required to solve a mass mass stoichiometry problem? one two three four none of the above
It is possible to find these four things on GHS a chemical label. 1. product identifier 2. pictograms 3. hazard statements 4. signal word True False
Why is it important to know the number of valence electrons of an atom? Nuclear Atomic Mass Isotopes Bonding
How many formula units are present in 872 grams of lead (IV)carbonate?
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's the best definition of chemistry? The study of matter and the changes it undergoes The study of the Earth and its processes The study of living organisms The study of stars and planets
Which instrument is used for holding, mixing, and heating small amounts of substances Pipette Test Tube Secchi Disc Graduated Cylinder
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
