Which of the following requires the most input of energy?

A. melting a substance

B. raising the temperature of the substance by 1° C

C. decreasing the temperature of the substance by 1° C

D. vaporizing a substance

Which type of force results when an object touches another object? Contact force Gravitational force Non-contact force Magnetic force

Which group appears to have members of the largest atomic radii for a given period?

the presure of a sample gas is at a constant volume of 7.0atm to 90degrees celcis what is the presure at 30 degrees celcius

What is the relationship between the surface of an object and the amount of friction it produces?

The process of filtration was used to separate a sample into its components. What conclusion about the sample can be formed based on the technique used? It was a pure substance. It was a compound. It was a heterogeneous mixture.

A solution that is 33.6 % by mass of phenol (C6H5OH) in water is prepared. What is the mole fraction of the phenol?

Describe the law of conservation of momentum

14. What steps should you take to keep parents and the public from viewing your personal information on social networks?

Match the factors which affect the rate of dissolving/dissociation/diffusion.

How would the equilibrium of an exothermic reaction at 25°c be affected if the temperature of the system were reduced? (hint: apply le chatelier's principle) ?