Write the molecular formula of glycine, an amino acid present in proteins. The color codes are gray (carbon), blue (nitrogen), red (oxygen), and yellow (hydrogen). (Type your answer using the notation CH4 for CH₄.)

Answer is not case sensitive.

1

Consider the reaction below.

MnO₂ + 4 HCl MnCl₂ + Cl₂ + 2 H₂O

If 0.81 mole of MnO₂ and 48.2 g of HCl react, which reagent will be used up first?
How many grams of Cl₂ will be produced?

Enter a number with the correct number of significant figures.

2 g

Classify the following redox reactions.

(a) 2 H₂O₂ 2 H₂O + O₂

1

combination reaction decomposition reaction     displacement reaction disproportionation reaction

(b) Mg + 2 AgNO₃ Mg(NO₃)₂ + 2 Ag

2

combination reaction decomposition reaction     displacement reaction disproportionation reaction

(c) NH₄NO₂ N₂ + 2 H₂O

3

combination reaction decomposition reaction     displacement reaction disproportionation reaction

(d) H₂ + Br₂ 2 HBr

4

combination reaction decomposition reaction     displacement reaction disproportionation reaction

Nitric oxide (NO) reacts with molecular oxygen as shown in the reaction below.

2 NO(g) + O₂(g) 2 NO₂(g)

Initially NO and O₂ are separated as shown below. When the valve is opened, the reaction quickly goes to completion. Determine what gases remain at the end and calculate their partial pressures. Assume that the temperature remains constant at 25°C.
P_NO

Enter an exact number.

1 atm
P_O2
2 atm
P_NO2
3 atm

A 19.2 g quantity of dry ice (solid carbon dioxide) is allowed to sublime (evaporate) in an apparatus like the one shown in Figure 6.10. Calculate the expansion work done against a constant external pressure of 1.035 atm and at a constant temperature of 18°C. Assume that the initial volume of dry ice is negligible and that CO₂ behaves like an ideal gas.

Enter a number with the correct number of significant figures.

1 kJ

Figure 6.10.