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February 2019 - Exceptional Paper

Archive for February, 2019

How would you classify the following elements as main group elements, transition metals, or inner transition metals: 1.Ca 2.Fe 3.Ag 4.U 5.O 6.Pb?

Refer to the explanation below. Ca is a main group element in period 4, group 2 of , in the s-block. Fe is a transition metal in period 4, group 8 of the periodic table, in the d-block. Ag is a transition metal in period 5, group 11 of the periodic table, in the d-block. […]

What is pH when ##[H^+] = 8.43 * 10^-4## ##M##?

##pH=3.07## ##pH=-log_10[H^+]##, equivalently ##pH=-log_10[H_3O^+]##. ##-log_10(8.43xx10^-4)=-(-3.07)=3.07##

How can I draw the structures of the two enantiomers of cysteine?

The easiest way is to draw them first as Fischer projections. The general formula for an amino acid is RCH(NH?)COOH. In cysteine, R = CH?SH. You draw the Fischer projection for an amino acid in the same way as for a carbohydrate. The main chain is vertical, with C-1 at the top. If the NH? […]

How is the kinetic theory of matter related to gases?

The kinetic molecular theory tells us how gas molecules are supposed to behave. In doing this, it makes a few assumptions about how gases behave. Let’s have a look at them and see if they’re right: Gas particles are infinitely small. In the real world, atoms and molecules are not infinitely small, making this incorrect. […]

Good Work Required

Students will submit four policy statements; to cover an Open Door Reporting Policy, A Safety Concern Card/Questionnaire (include designed form), Verbal Reporting of Injury, and Peer Reporting Initiative as covered in class.

Why is iron hard and sodium is soft, yet they are both metals?

Sodium is an alkali metal and is very soft and can cut through knife while iron is a transition metal which is very hard and requires great energy to break apart.Iron is hard, tough and strong compared with sodium because of the strong metallic atom-atom .The strong attractive force between the atoms is only weakened […]

What is the molar mass of sodium hydroxide?

The molecular molar mass consists of the atomic masses of each atom. Sodium hydroxide is ##”NaOH”##. Thus, its molar mass involves: ##”M”_”Na” = “22.989 g/mol”## ##”M”_”O” = “15.999 g/mol”## ##”M”_”H” = “1.0079 g/mol”## So, its molar mass is ##22.989 + 15.999 + 1.0079 = color(blue)(“39.996 g/mol”)## to 5 sig figs.

Is CO2 an empirical formula, a molecular formula, or both?

It is both! The empirical formula is the simplest whole number that defines constituent atoms in a species. The molecular formula is always a multiple of the empirical formula.

project and change management

Week 5 Communications Plan Attached Files: ·         Completing the Project Communication Plan.pptx (203.016 KB) ·         Communication Plan.xls (31.5 KB) ·         Communication Plan Example.xls (32.5 KB) Some reports indicate that project managers spend 70 percent of their time communicating. Perhaps that is why they plan recurring communication events. This translates to meeting and reports. Review the PowerPoint on Communications Planning and then complete […]

What is the percent concentration of sodium chloride in normal saline?

Normal saline that is used in medicine has a concentration of 0.90% w/v of ##”Na”##Cl in water. It is prepared by dissolving 9.0 g (154 mmol) of sodium chloride in water to a total volume of 1000 mL. This means that normal saline solution contains ##”154 mmol”//”L of Na”^+## ions and ##”154 mmol”//”L of Cl”^”-“## […]

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