45 2.0

2. How many joules of heat are needed to raise the temperature of 048 kg of aluminum from 21°C to

94°C, if the specific heat of aluminum is 900 J/g °C?

The limiting reactant determines what the actual yield is. a. True b. False

The bond between carbon and hydrogen is one of the most important types of bonds in chemistry. The length of an H-C bond is approximately 1.1 Å.

A travel mug of 91∘C coffee is left on the roof of a parked car on a cold winter day. The temperature of the coffee after t minutes is given by H=91 (2) - t/14. After how many minutes will the coffee be only lukewarm (30∘C) ?

You were asked to determine the identity of an unknown liquid and can measure only one physical property. you heat the liquid and record that the liquid turns to vapor at hundred degrees Celsius. this demonstrates what physical property

Carbon monoxide reacts with oxygen to form carbon dioxide. 2 CO (g) + O2 (g) → 2C02 (8) In a 1.00 L flask, 3.40 atm of CO reacts with 2.60 atm of O2. Assuming that the temperature remains constant, what is the final pressure in the flask? 4.30 atm 2.

If you change the state of something, say, liquid to solid, is it a physical or chemical change?

What type of calorimeter would be best to use if you wanted to measure the heat that is released when gasoline is burned?

Tina has a sample of gaseous water at a temperature of 400 C and a pressure of 4 atm. If Tina increases the pressure to 200 atm, will the gaseous water liquefy? Why or why not?

Label the molecular shape around each of the central atoms in the amino acid glycine. hint

Which has more atoms, 2moles of carbon or 2 moles of aluminum