1. Which of the following facts did Dalton realize? a. Two different elements can only form one type of compound.
b. Each compound contains a fixed ratio of atoms.
c. Atoms of the same element can have different masses.

After answering please explain why and/or how.

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

Calculate the frequency of a wave in a spring toy. the wave has a speed of 1.1 meters per second and a wavelength of 0.1 meters. *