Which organism lived on Earth during the Paleozoic era? A. trilobite B. dinosaur C. pine tree D. octopus

What property of aluminum allows the aluminum foil to change its shape?

Cup A and cup B are identical. They contain equal volumes of soup at equal temperatures. Both cups are put in a refrigerator. Cup A has a lid, but cup B does not. Which statement best explains why cup A will cool more slowly than cup B? A.

Why do scientists use scientific notation? A. It provides an easier way to write very large and very small numbers. B. It provides an easier way to write chemical formulas. C. It provides an easier way to write the element names. D.

Adding food color to water causes a color change. is this evidence of a chemical reaction? explain

In an exothermic reaction: A. The forward reaction is slower than the reverse reaction B. the reaction rate will speed up with time. C. the collision energy of the reactants will be greater than that of the products D.

Common properties of sodium, calcium, iron, and gold

The closeness of a measurement to its actual value is a measure of its A. usefulness. B. reproducibility. C. precision. D. accuracy.

At 300 k the pressure inside a gas filled container is 500 kPa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas

The SI unit for current is: joules volts ohms amps

In chemical reactions, there is a conservation of what?