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Gravity
Terms in this set (13)
Hydrogen
H
Lithium
Li
Beryllium
Be
Sodium
Na
Magnesium
Mg
Potassium
K
Calcium
Ca
Rubidium
Rb
Strontium
Sr
Cesium
Cs
Barium
Ba
Francium
Fr
Radium
Ra
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Verified questions
PHYSICAL SCIENCE
A type of protein that speeds up a chemical reaction in living things is called a(n) _.
CHEMISTRY
Locate each of the following elements in the periodic table; give its name and atomic number, and indicate whether it is a metal, metalloid, or nonmetal: Mn
CHEMISTRY
Bromine monofluoride (BrF) disproportionates to bromine gas and bromine tri- and pentafluorides. Use the following to find $\Delta \mathrm { H } ^ { \circ }$rxn for the decomposition of BrF to its elements: $3 \mathrm { BrF } ( g ) \longrightarrow \mathrm { Br } _ { 2 } ( g ) + \mathrm { BrF } _ { 3 } ( l ) \quad \Delta H _ { \mathrm { rxn } } = - 125.3 \mathrm { kJ }$ $5 \mathrm { BrF } ( g ) \longrightarrow 2 \mathrm { Br } _ { 2 } ( g ) + \mathrm { BrF } _ { 5 } ( l ) \quad \Delta H _ { \mathrm { rxn } } = - 166.1 \mathrm { kJ }$ $\mathrm { BrF } _ { 3 } ( l ) + \mathrm { F } _ { 2 } ( g ) \longrightarrow \mathrm { BrF } _ { 5 } ( l ) \quad \Delta H _ { \mathrm { rxn } } = - 158.0 \mathrm { kJ }$
CHEMISTRY
Ammonia is not the only possible fertilizer. Others include urea, which can be produced by the reaction, $$ \begin{align*} \mathrm{CO_2}(g)+2\;\mathrm{NH_3}(g)&\rightarrow\mathrm{CO(NH_2)_2}(s)+\mathrm{H_2O}(g). \end{align*} $$ A scientist has 75 g of dry ice to provide the carbon dioxide. If 4.50 L of ammonia at 15 °C and a pressure of 1.4 atm is added, which reactant is limiting? What mass of urea will form?
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