Why did mendeleyev leave spaces in the periodic table

Given that 1000 g = 1 kg, how many grams are equal to 52.3 kg?

What is wrong with rutherford's model of the atom

Which scientist established the law of octaves? A. Antoine Lavoisier B. Dmitri Mendeleev C. Henry Moseley D. John Newlands

Based on it's group number, what ion charged state does bromine form? A.) 1- B.) 2-

The process by which dissolved gases are exchanged between the blood and interstitial fluids is

NO2 and N2O4 undergo the reaction shown. When a sealed container of NO2 reaches chemical equilibrium, which must be true? A) No N2O4 is present. B) No chemical reactions are occurring. C) The rates of the forward and reverse reactions are equal.

What differences did you notice in the different states of water

1. Bubbling or fizzing is an indicator of a. property change b. phase change c. physical change d. chemical change

In the second step of this reaction, isocyanic acid reacts to form melamine and carbon dioxide: HNCO (l) →C3N3 (NH2) 3 (l) + CO2 (g) Balance this reaction and enter the coefficients below.

If the Kelvin temperature of a gas is tripled and the volume if doubled, the new pressure will be ___. A. 3/2 the original pressure B. 1/6 the original pressure C. 5 times the original pressure D. 2/3 the original pressure the answer isnt b or c