Qué método utilizaría para separar los componentes de una mezcla de: limaduras de hierro, azufre en polvo y piedras?

Read the hypothesis below. Hypothesis: If a steel surface is wet with water, then the friction will be reduced. Which question best matches this hypothesis? A. How is water affected by the force of friction? B.

The temperature of 2.00 mol Ne (g) is increased from 25°C to 200°C at constant pressure. Assuming the heat capacity of Ne is 20.8 J/K·mol, calculate the change in the entropy of neon. Assume ideal gas behavior. a.+19.2 J/Kb.-7.68 J/Kc.+7.68 J/Kd.-19.

5. What happens when you make ice cubes by putting a tray of water in the freezer? a. The water gains cold from the freezer. b. The particles of water stop moving. C. The temperature of the water falls. d. The water vaporizes.

A student measures the length of a 1.00 m standard bar. He obtains measurements of 0.99 m, 1.01 m, and 1.00 m. Which describes his measurements? A. precise but not accurate B. accurate but not precise C. neither precise nor accurate D.

How many protons, neutrons, and electrons are there in 70Se2-?

When one substance changes into one or more new substances, it has exhibited a 1. chemical change. 2. chemical reaction. 3. physical change. 4. chemical property?

americium-241 has a half-life of 430 years. how much of a 10.0g sample of americium-241 remains after 1720 years?

Disease causing bacteria need oxygen to survive. true or false

Tell what kind of electrical charge eltrons, protons, and neutrons have

Which of the following substances is an Arrhenius acid? BF3 HCN NH3 Mg (OH) 2