Which scientist observed that compounds are always joined together in fixed ratios?

A. Boyle

B. Bohr

C. Lavoisier

D. Proust

How many valence electron do silver have

Which best explains what happens when an electron moves from an excited state to the ground state? A) The electron absorbs energy as it moves to a lower energy level. B) The electron absorbs energy as it moves to a higher energy level.

Calculate the volume of a sample of gas at 5.75 atm if it occupies 5.14 L at 2.49 atm

Calcule la normalidad de una solución que contiene 26g de nitrato de cúprico disuelto en 1200 ml de solución.

The periodic table below shows the state of matter of elements at standard temperature and pressure. Based on the periodic table above, which of the following elements is a gas at standard temperature and pressure? A. K B. Ca C. Br D. Ar

Solid lead IV oxide decomposes into solid lead and oxygen gas.

Ab2 has a molar solubility of 3.72*10-4 m. what is the value of the solubility product constant for ab2? express your answer numerically.

Thermal decomposition of sodium azide (NaN₃) into nitrogen gas and sodium metal is used to inflate car airbags. The reaction proceeds by the following chemical reaction. 2NaN₃ (s) ⟶3N₂ (g) + 2Na (s) How many grams of NaN₃ are need to inflate a 10.

Is salt water acidic, basic or neutral

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