Why no machine is 100 efficiency?

What occurs when a 35-gram aluminum cube at 100.°C is placed in 90. grams of water at 25°C in an insulated cup? (1) Heat is transferred from the aluminum to the water, and the temperature of the water decreases.

A balloon vendor at a street fair is using a tank of helium to fill her balloons. The tank has a volume of 113.0 L and a pressure of 122.0 atm at 25.0 °C. After a while, she notices that the valve has not been closed properly.

Which substance can be broken down by a chemical change? antimony, carbon, water or sulfur

What does it mean when we say "kinetic energy in an electron"?

Three grams of the same substance in different phases are stored in three different containers. Each container is barely large enough to hold the substance. a. The atoms in the solid would be moving vigorously around the container. b.

Jin listed some common thermal insulators and conductors in a chart. A 2-column table with 2 rows. The first column labeled Insulators has entries rubber, air. The second column labeled Conductors has entries copper, X.

A major component of gasoline is octane. When liquid octane is burned in air it reacts with oxygen gas to produce carbon dioxide gas and water vapor. Calculate the moles of carbon dioxide produced by the reaction of of oxygen.

Which of the following statements about transition metals is true? a. They are never found uncombined in nature. b. They include familiar metals such as gold, silver, copper, and nickel. c.

Elements can be separated from one another. Question 6 options: True False

One gram of lipid yields about 9kcal of energy. that is due to the high abundance of which chemical element?