Which of the following is the Sl unit used by chemists to measure the amount of an element or substance?

A. molecule

B. mole

C. atom

D. milliliter

A physical property of gold is its

The molar enthalpy of fusion for water is 6.008 kj/mol. what quantity of energy is released when 253g of liquid water freezes? (molar mass of water is 18.02 g/mol)

What is the charge of an object that has lost 25 electrons?

During a phase change, energy is absorbed. what type of reaction is this? A. Exothermic B. Endothermic C. Sublimation D. Fusion

Why is combustion of fuel necessary for heat engines to do work?

Which of the following are the top two job expectations of people who career plan? Select all that apply. A. Hours B. benefits C. type of work D. coworkers E. security

Define the term volt.

A baseball player was hit by a baseball in the left eye and complains of double vision. What should you do? A. Restrict spinal movement B. Assess pupillary response C. Perform a detailed exam D. Apply ice to orbit

An approaching storm is moving at 15 km an hour what do you need to know to determine its velocity

How did astronomers precisely determine the length of an Astronomical Unit in the 1960s?