The pH of a 1.5M solution of pentanoic acid (HC_(5)H_(9)O_(2)) is measured to be 2.33. Calculate the acid dissociation constant K_(a) of pentanoic acid . Round your answer to 2 significant digits. K_(a)=square
The purpose of a buffer system is to: A maintain a norma growth rate B prevent drastic changes in pH C ensure proper digestion D speed up nerve impulses
Which is the main element behind the cause of dehydration? Calcium Sodium Potassium Magnesium
The most abundant salt in seawater is NaCI MgCI CaCO KCI
Sugar is dissolved in water. What is the water in this solution? solvent solution solute
Below is the Lewis structure of the chlorine (Cl_(2)) molecule. :ddot (Cl):ddot (Cl): Count the number of bonding pairs and the number of lone pairs around the right chlorine atom. bonding pairs: square lone pairs: square
How many sigma and pi bonds does nitrate have? A o sigma, 3 pi B 0 sigma, 4 pi C 3 sigma, 1 pi D 2 sigma, 1 pi
For hydronium What backbone orbital is used in this example?1.e. what is the electron pair geometry? A The LINEAR BACKBONE B The TRIGONAL BACKBONE C The TETRAHEDRAL BACKBONE D The TRIGONAL BIPYRAMIDAL BACKBONE E The OCTAHEDRAL BACKBONE
What is the pH of a 3.0times 10^-4M HI solution? 1048 3.00 3.52
Fill in the left side of this equilibrium constant equation for the reaction of nitrous acid (HNO_(2)) with water. square =K_(a)
Which best compares and contrasts how John Newlands and Dmitri Mendeleev organized eleme Both Newlands and Mendeleev arranged elements according to their chemical properties, but used atomic mass as well. Both Newlands and Mendeleev arranged elements according to their atomic masses, but only chemical properties as well. Both Newlands and Mendeleev organized elements into groups, but only Newlands used a tak columns. Both Newlands and Mendeleev organized elements into a table with rows and columns , but ol named different groups of elements.
The following chemical reaction takes place in aqueous solution: $FeBr_{2}(aq)+(NH_{4})_{2}S(aq)\rightarrow FeS(s)+2NH_{4}Br(aq)$ Write the net ionic equation for this reaction.
How many atoms would be in 3 moles of Oxygen? (3) $(6.02\times 10^{24})$ of 0 atoms (2) $(6.02\times 10^{23})$ of 0 atoms (3) $(6.02\times 10^{23})$ of 0 atoms (4) $(6.02\times 10^{23})$ of 0 atoms
A chemical equation is balanced when: A The number of atoms of each element is the same on both sides B The coefficients are all "1" on both sides C The coefficients add up to the same number on both sides D The subscripts are all identical on both sides
14. What is the concentration of $H_{3}O^{+}$ ions in the 0 .003 M $H_{2}SO_{4}$ solution? What is the pH of this solution?
The products of the reaction: $Ag+HCl\rightarrow $ ? are: A $AgCl_{3}$ and $H_{2}$ B AgH and $Cl_{2}$ C no reaction
What are the two types of luster? Shiny and Dull Metallic and Non-metallic Earthy and Non-Earthy Dark and Light Colored
$2Na+2H_{2}O\rightarrow 2NaOH+H_{2}$ If we start with 20 moles of Na, how many moles of NaOH will be produced? A 10 moles B 5 moles C 20 moles D None of the above
When sugar is burned , water vapor and carbon dioxide are produced. A sugar molecule has a specific number of carbon, hydrogen, and oxygen atoms. Use the balanced chemical equation to identify the number of carbon , hydrogen, and oxygen atoms in sugar. $sugar+12O_{2}\rightarrow 11H_{2}O+12CO_{2}$ Sugar has $\square $ carbon atoms. Sugar has $\square $ hydrogen atoms. Sugar has $\square $ oxygen atoms.
Elsa has a jar of honey that was left outside on a hot summer day. She notices that there are now sugar crystals at the bottom of the jar.What type of solution is the honey? unsaturated saturated supersaturated polyunsaturated
