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
A solution is made with 100 milliliters of water, how much solute will dissolve if 200 milliliters is used by the student at the next table? Half as much solid can dissolve in the 200 mL One-fourth as much solid can dissolve in the 200 mL Twice as much solute can dissolve in 200 mL The same amount will dissolve in 200 mL as what dissolved in 100 mL
Which of the following represents a covalent molecule? SELECT ALL THAT APPLY a $CO_{2}$ b $Cl_{2}$ C He d $O_{2}$
Div 5. Calculate the number of moles in 18.0 g of sodium chloride (NaCl). 0.31 mole 1044 moles 3.2 moles 18 moles
Which noble gas does not possess a true octet? a helium b xenon c radon d argon
When the following equation is balanced, what is the sum of the coefficients? $\underline {\quad }C_{2}H_{4}+\underline {\quad }O_{2}\rightarrow \underline {\quad }CO_{2}+\underline {\quad }H_{2}O$ 11 7 6 8
Rost Lab: Single-Replacement Reactions occur when a more reactive element displaces a less reactive element compound. There is a table on the back of your periodic table labeled "Activity Series". Higher elements are more elements on the table In other words elements higher on the Activity series will replace elements lower in the seri elements will not replace higher elements. The speed and energy of the reaction is directly proportional to the dis two elements on the series. 3. Balance the following equations. a. $\underline {\quad }F_{2}+\underline {\quad }NaCl\rightarrow \underline {\quad }Cl_{2}+\underline {\quad }NaF$ b. $\underline {\quad }Li+\underline {\quad }MgCO_{3}\rightarrow \underline {\quad }Mg+\underline {\quad }Li_{2}CO_{3}$ c. $\underline {\quad }K\quad +\underline {\quad }Al(OH)_{3}\rightarrow \underline {\quad }Al\quad +\underline {\quad }KOH$ d. $\underline {\quad }Br_{2}+\underline {\quad }CaCl_{2}\rightarrow \underline {\quad }Cl_{2}+\underline {\quad }CaBr_{2}$ e. $\underline {\quad }Zn+\underline {\quad }Cu_{3}(PO_{4})2\rightarrow \underline {\quad }Cu+\underline {\quad }Zn_{3}(PO_{4})_{2}$
Predict the products of the reaction below $Mg+Cu(NO_{3})_{2}\rightarrow \underline {\quad }+\underline {\quad }$ $Cu+Mg(NO_{3})_{2}$ $Cu+MgNO_{3}$ $CuMg+NO_{3}$ $Mg_{2}NO_{3}+Cu$
A chemical substance that is present at the start of a chemical reaction Exothermic Enzyme activation energy Reactant
A solution contains 803.92 milligrams of glucose per 100 ml sample. The molar mass of glucose is $180.15g/mol$ What is the molarity of glucose in the sample? $\square $
3. What is the percent composition of $CO_{2}$
