HELPP Figure 2 shows an electronic balance measuring the mass of a beaker before and alter adding liquid into it.
250 cm3
250 cm3
44.48g before
128.98g after
Which of the following best describes the density of the liquid?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90

Give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2