What is the correct formula unit when calcium is combined with nitrogen? Ca_(3)N CaN_(3) Ca_(3)N_(2) Ca_(3)N_(3)
The presence of an O2 rich atmosphere wil effect the normal flash point and auto ignition temperatures of a substance by __ them. lowering raising
What is the main purpose of direct mass measurement in the lab? To find the mass of a substance in a container To measure how mass changes during a reaction To determine the mass of an object like a beaker To get a specific amount of a chemical
The selection of a particular distillation tray type depends on the: Fouling matter. Cost. Capacity flexibility. All of these.
Cleaning solutions fall into this category of hazard. Biological Chemical Physical
A negative ion is formed when an atom loses electrons. True False
What are the small chemical units that can combine to form molecules? Ecosystems Tissues Atoms Organelles
3. ¿Qué puede sucederle a un electrón en un átomo cuando el átomo gana o pierde __
7. What is a physical change? A. A change that creates a new substance B. A change in size, shape, or state C. A change caused by mixing chemicals D. A change that cannot be reversed
Use the periodic table to determine the family of the following element: Iodine (I) square Alkali metal Alkaline earth metal Halogen
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
