Item 7 An engineer is designing a shape memory alloy. Which of the following is a limitation of these types of materials? Choose the correct answer.

They are composed of rare metals.

They can wear out after repeated use.

They are difficult to manufacture on a large scale.

They are hazardous when placed in the human body.

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

The molality of calcium chloride (cacl2) in an aqueous solution is 2.46 m. what is mole fraction of the solute?

Sulfuric acid is a polyprotic acid. write balanced chemical equations for the sequence of reactions that sulfuric acid can undergo when it's dissolved in water.