Is melting a piece of wax a physical change or chemical change?

A plant species has two possible gene variations for seed shape. One plant has smooth seeds, and another has wrinkled seeds. There is a no chance that their offspring will be born with wrinkled seeds. What can u conclude from this information

In Antoine Lavoisiers classic experiment, Mercuric oxide is heated in a sealed container. The solid red powder is change into two products:Silver liquid mercury and oxygen gas. If Lavoisier.

Which one of these are correct base pairs in DNA?

Planets near the Sun are composed of mainly rock and iron. How does the Solar Nebula theory account for this?

What element is represented by the following electron configuration: 1s22s22p63s23p64s23d4 Question 2 options: Cr Ca Ge Ar

Does a mole of hydrogen have the same mass as a mole of oxygen? explain your answer.

A 0.500-L sample of H₂SO₄ solution was analyzed by taking a 100.0mL aliquot and adding mL of. After the reaction occurred, an excess of ions remained in the solution. The excess base required mL of for neutralization.

Ammonia can be prepared by the reaction of magnesium nitride with water. The products are ammonia and magnesium hydroxide. Write and balance the equation.

Which period is the shortest in the long form of the periodic table? Name all the elements in this period.

A mole of gas at 0.0oC and 760. torr occupies 22.4 L. What is the volume of this gas at 25. oC and 760. torr