Which Of These Is An Indication that a chemical reaction occurred

A. formation of gas

B. boiling of a substance

c. melting of a substance

d. freezing of a substance

A sample of a compound containing only carbon and oxygen decomposes and produces 24.50g of carbon and 32.59g of oxygen. what is the sample?

In that universe, which of the following objects would require quantum mechanics to describe, that is, would show both particle and wave properties? Which objects would act like everyday objects, and be adequately described by classical mechanics?

Which type of energy is associated with the random motion of atoms and molecules in a sample of air? (1) chemical energy (2) electrical energy (3) nuclear energy (4) thermal energy

Determine the final temperature of a 10-0-g aluminum block originally at 25.0°C if you apply 435 joules of energy to it

If your lungs were filled with air containing this level of lead, how many lead atoms would be in your lungs? (Assume a total lung volume of 5.60 LL.)

Nitrogen combines with oxygen to form nitrogen monoxide (no) and nitrogen dioxide (no2). a sample of no consists of 1.14 g of oxygen and 1 g of nitrogen.

The modern periodic table reflects many improvements to Mendeleev's original table. If Mendeleev's table was incorrect, why is it still studied in chemistry classrooms today?

Good evening everyone, I just wanted to know who's willing to talk to me

Explain how the nettle is adapted for defence and protection

How many moles of water vapors are formed when 10L of butane gas is burned in oxygen at STP?