Which material is a mixture? a water b methane c air d magnesium

If a cup of coffee is at 90°C and a person with a body temperature of 36°C touches it, how will heat flow between them? O from the hand to the cup O from the cup to the hand O from the cup to the surrounding air Ofrom the hand to surrounding air

A mixture of NH3 and N2H4 is placed in a sealed container at 300K. The total pressure is 0.50 atm. The container is heated to 1200 K at which time both substances decompose entirely according to the equation 2NH3 - > N2 3H2, N2H4 - > N2 2H2.

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What role does heat have in plate tectonics? Question 4 options: It thins out oceanic crust It causes gas to escape the core of the earth It causes volcanic eruptions It moves crust plates around

What indicates that a chemical change has occurred?

True or False: It is recommended to use sugar cubes to sweeten lemonade because they have a low surface area.

54,000,000 nanometers equals 0.000000054 megameters.

When cream mixes with coffee, is this a chemical or physical change?

A gas occupies 72.1 at stp. At what temperature would the gas occupy 85.9 L at a pressure of 93.6 kPa?

An 80 kg volleyball player lands from a jump and tries to stop her forward motion. The normal contact force exerted by the floor on her shoes is 2000 N. The friction force exerted by the floor on her shoes is 600 N acting backward on the player.