An unknown substance has mass of 20 grams and volume of 2 cm3. What is the density of the substance

Will the precision of a calculation (ex. volume = l x w x h) ever be more precise than the original measurements (ex. length) ? explain your answer.

Besides plants and animals wood and what can be what to release carbon into the air

What is the volume occupied by 4.20 miles of oxygen gas (O2) at STP

An experiment is conducted to see if cats preferred skim milk or 2% milk. A cup of skim milk was put out for 5 kittens and then measured how much the kittens drank over the course of a day.

Nucleic acids are hydrocarbons that also contain which other element?

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