In the following code, totalAmountStr may or may not be null. This means the compiler will infer Double? as the data type for total. val total = totalAmountStr.toDoubleOrNull() ?: 0.0

A pull down bed is located on the wall of a small bedroom.  In an attempt to pull down the bed to the floor, by pulling on a string attached the bottom end of the bed, Alicia exerts a 625 N force at an angle of 40 degrees to the floor.  The length of the bed is 2m.  What is the magnitude of the torque at the point where the hinge is located? Round answer to a whole number. I have entered the unit for you. Answer:  The torque is [torque]

Kinases are enzymes that catalyze the addition of phosphate groups to target molecules, a process called phosphorylation. Phosphatases are enzymes that catalyze the removal of phosphate groups from already-phosphorylated proteins, a process called dephosphorylation. Phosphorylation and dephosphorylation can function as a molecular on/off switch for a protein’s activity, most likely through:

Describe the function of the labelled components of the above galvanic cell. a) b) c) d) e) f)

Describe a method that could be used to prevent the corrosion of iron.

Name the type of each common organic reaction and name the missing component; a)  hept-2-ene + H2 –> ________________   b)  butane + O2 –> H2O + __________   c)  _____________  —> H2 + oct-1-ene  

Periodic Table.pdf Mass = Moles x Molar Mass M = moles/Litres 1 mole = 6.02 x 1023 particles a) how many moles are there in 1.34 x 1018 molecules of H2O? b) what is the mass of 3.7 moles of NaOH? c) how many particles are there in 14 moles of O2? d) what is the mass of 3.5 x 1023 particles of H2O?

You are analyzing the results of a competitive immunoassay. If the instrument detects a very high signal intensity from the label, what conclusion must be drawn about the patient’s analyte concentration?

a) What can contribute toward the molecular polarity of an organic molecule? b) How does the polarity of an organic molecule contribute towards it’s behaviour (properties)?

M = moles/volume in L You use 0.64L of 0.75M sodium hydroxide (NaOH) and carry out the titration on a 1.5L sample of acid (HCl). Determine the concentration (in moles/L) of the HCl.