Irregular preterite forms Select the correct form of the verb to complete the following sentences. ¿A qué hora  Uds.?  Ricardo no  saludar a Pedro y Tomás. Todavía está enojado. ¿Qué  tú?  Los estudiantes no  terminar el examen.  José  todo anoche. Mamá  la comida en el refrigerador. ¿Qué  Uds. a la fiesta? Esa fiesta  muy mal. ¡Qué desastre!  Muchos estudiantes  en bicicleta a clase esta mañana para celebrar Earth Day. 

Which of the following is TRUE of blended families formed by remarriage?

If a reaction requires 1.25 mmols of DMSO how many microliters are required?  Show your work in the space provided.  You will need to type it… sorry.   The following is a table of physical properties of acetic acid.  

Sports and fitness ¿Cierto o falso? Hay atletas en el equipo.   El médico recomienda jugar al ajedrez para fortalecer los músculos.   El estadio es un lugar para jugar partidos.   Muchas personas esquían en las montañas en el invierno.   Es popular esquiar en el agua en el invierno.   La rueda de andar es buena para hacer ciclismo estacionario.   Jugamos al vólibol en la cancha del gimnasio.  

Take a picture of your work to email me for possible partial credit: An aqueous solution is 0.467 M in HCl. What is the molality of the solution if the density is 1.23 g/mL?

Which of the following characterizes abusive parents?

Take a picture of your work to email me for possible partial credit: Calculate the total quantity of heat required to convert 25.0 g of liquid CCl4(l) from 35.0°C to gaseous CCl4 at 76.8°C (the normal boiling point for CCl4). The specific heat of CCl4(l) is 0.857 J/(g ∙ °C), its heat of fusion is 3.27 kJ/mol, and its heat of vaporization is 29.82 kJ/mol.

A researcher claims that some bacteria contain factors that influence the function of a particular enzyme but other bacteria do not. To test the claim experimentally, the researcher will grow two different bacterial strains in separate liquid cultures and isolate the contents of the cells in each culture. The researcher will add different combinations of cellular contents, substrate, and enzyme to test tubes containing a buffer solution adjusted to the optimal pH of the enzyme and then measure the rate of product formation. The design of the researcher’s experiment is presented in Table 1. Table 1. An experiment for investigating the influence of bacterial factors on enzyme function Test Tube Source of Cellular Contents Cellular Contents Added Substrate Added Enzyme Added 1 Strain 1 No Yes Yes 2 Strain 1 Yes No Yes 3 Strain 1 Yes Yes No 4 Strain 1 Yes Yes Yes 5 Strain 2 No Yes Yes 6 Strain 2 Yes No Yes 7 Strain 2 Yes Yes No 8 Strain 2 Yes Yes Yes Which of the following statements best justifies the inclusion of test tubes 3 and 7 in the experiment?

Take a picture of your work to email me for possible partial credit: How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling point, if its ΔHvap is 31.6 kJ/mol?

Which of the following normally leads to the production of functional messenger RNA in eukaryotic cells?