2. Which types of changes observe the law of

conservation of mass?

A. only changes of state

B. only physical changes

C. only chemical changes

D. physical changes and chemical changes

A 49.2 g sample of solid steel was heated from 24.1 °C to 67.3 °C. What was the energy change? Solid steel has a specific heat of 0.4494 J/gºC.

Choose the answer that takes place when a liquid absorbs heat energy without increasing its temperature. A.) the pressure increases B.) it vaporizes C.) it solidifies D.) the volume decreases

A teacher wants to preform a class room demonstration that illustrates both chemical and physical changes. which would be the best demonstration she could use

The electron configuration for the carbon atom (c) 1s22s22p2. the atomic number of carbon is

When falling through the air, which of the following objects will hit the ground first? a penny a large poster a shoe box a cell phone

Water is A. Acidic B. Basic C. Neutral

What variables affect the acceleration of an object and in what manner do they affect the acceleration?

How do valence electrons relate to the chemical reactions of an element?

What is the weighted-average mass of all known isotopes for an element

What is the Celsius equivalent of 212°f