Which of the following ideas about the atom changed when new evidence was discovered?

A. Elements are different kinds of atoms.

B. All matter is made up of atoms.

C. Atoms cannot be divided.

D. Atoms are made up of smaller particles.

Alchemy refers to the transmutation of A. metals. B. co-enzymes. C. chelation. D. chemicals.

You want to understand temperature. which of the following would you study? A. the heaviness of different objects B. how much air a balloon can hold C. a glass of water and a tray of ice D. how many marbles fit into a box

What volume is occupied by 3.760 g of oxygen gas at a pressure of 88.4 kPa and a temperature of 19°C? Assume the oxygen is ideal. Use "8.314" for R. Hint: Convert 3.

A substance is followed by the symbol (l) in a chemical equation. What does the symbol represent? A. The substance has the least molecules in the equation. B. The substance is in the liquid state. C. The substance is produced last in the reaction. D.

Why do copper ions go to the negative electrode

John dalton said that all atoms are identical in size and mass. explain why this is incorrect.

Complete each question by choosing or typing in the best answer. Time (seconds) Wavelength (nm) 0.1 2 0.2 2.5 0.3 3 0.4 3.5 0.5 4 0.6 4.5 Nina's measurements, shown in the table here, BEST represent a wave with A) decreasing frequency.

Suggest a mechanism that is consistent with a second order rate law

5. The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomie masses are 69.2% and 30.8% respectively. Calculate the average atomic mass of copper,

Determine the hydroxide ion concentration in a solution that is 0.018 m naoh.