How man kilo-calories of heat are required to raise the temperature of 225 g of aluminum from 20 C to 100 C?

0.59 kcal

3.8 kcal

38 kcal

85 kcal

he solution is said to be an ideal solution, only when the intermolecular forces of attraction between A-A, B - B and A - B are nearly equal. True False

What does the nucleus of a cell do

Francine makes several measurements of the mass of a metal block. The data set is shown in the table below. Measurement Mass of metal block (g) 1 20.73 2 20.76 3 20.68 4 20.75 After analyzing this data set, Francine calculates a value of 20.73 g.

Which of the following is an example of a heterogeneous mixture? A. table salt B. iced tea C. clear hot tea D. clear salt water

The actual density of iron is 7.874 g/mL. In a laboratory investigation, Jason finds the density of a piece of iron to be 7.921 g/mL. What is the percent error that is associated with Jason's measurement? -4.7% -0.6% 0.6% 4.7%

How does temperature affect the rate of a reaction? A. Increasing the temperature decreases the potential energy of the reactants. B. Increasing the temperature gives the molecules more kigetic energy C.

Who thought everything was made from fire, earth, air, and water? A. Ancient Egyptians B. Democritus C. Socrates D. Aristotle SUBN

A 52.8-g sample of glucose (a nondissociated, nonvolatile solute with the formula C6H12O6) is dissolved in 158.0 g of water. What is the vapor pressure of this solution at 100°C?

When making a solution of sugar and water, you begin with a 500 ml beaker, 10 grams of sugar, and 400 ml of distilled water. which procedure will allow you to dissolve the most sugar in the least amount of time?

What is the definition of covalent bond?