A chemical change occurs when select one:

a. dissolved minerals solidify to form a crystal.

b. ethanol is purified through distillation.

c. salt deposits form from evaporated seawater.

d. a leaf changes color in the fall.

Explain how Dmitri Mendeleev arranged his periodic table. How was he able to make predictions about the blanks that he left in the table?

How would using a wider cuvette affect absorbance?

What are Photosyntheis? . how plants make their food . how aminal hurt . how plant get water . how rain is made

What kind of force acts between magnetic poles if the poles are alike? A force of attraction A repelling force A gravitational force An electric force

Why are electrical wires insulated with plastic or rubber?

When molten rock undergoes crystallization above ground, what type of rock results? a. intrusive igneous rock b. extrusive igneous rock c. metamorphic rock d. sedimentary rock

A 150ml sample of hydrochloric acid completely reacted with 60.0mL of a 0.100 M NaOH solution. What was the original concentration of the HCl solution

Rearrange in to a quadratic 5.333 = (0.6 + 2p) ² / (0.135 - p)

How hot would a 2.3 L balloon have to get to expand to a volume of 3.0 L? Assume the initial temperature of the balloon is 24 °C, and that the pressure inside the balloon remains constant. A. 3 K B. 42 K C. 128 K D. 390 K

Which pair of nitrogen bases will form a bond in a DNA molecule? a. cytosine and adenine b. adenine and thymine c. guanine and thymine d. thymine and cytosine