Energy per gram released by chocolate
answer in kJ/g 1000J=1kJ 600.0g water warmed up
Chocolate: initial mass 16.32g final mass 15.02g change in mass 1.30g initial temp of water 20.0°C final temp of water 31.6°C change in water temp 11.6°C
under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.
i think? ?
Answer from: Quest
oxygen, selenium, tellurium, and polonium.
they're all from the same group as sulfur (group 16).
Answer from: Quest
the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise, if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.
Imagine that you have produced several versions of lactase, each of which differs from normal lactase by a single amino acid. describe a test that could indirectly determine which of the versions significantly alters the three-dimensional shape of the lactase protein.