Copper has two stable isotopes 63cu and 65cu. 63cu has an abundance of 69.09%. the other isotope, 65cu, has an abundance of 30.91%. calculate the average atomic mass of copper.

How do you evaporation and boiling differ?

Based on Reference Table S, the atoms of which of these elements have the strongest attraction for electrons in a chemical bond? (1) N (3) P (2) Na (4) Pt

How did Mendeleev organize the elements to create a periodic table? alphabetically by element name according to increasing mass and similar properties according to the year of their discovery according to increasing mass and number of protons

Ethanol is used widely as a solvent in laboratories for various chemical reactions. A laboratory technician takes 50.0 mL of ethanol and dilutes it to 100.0 mL with distilled water.

How can a scientific law be expressed as a mathematical equation?

Which characteristic best identifies an Arrhenius base

Which statement correctly describes why a compound is a pure substance? O A compound is not a pure substance because each of its molecules is m elements A compound is a pure substance because its molecule cannot be broken O A compound is not a pure

What negative impact did chemistry have on society through the production and use of chlorofluorocarbons?

A food web shows the easiest way to get the most energy out of a producer the path a producer has to take to reach the top of the web how all organisms are connected through energy all of the possible energy pathways through an ecosystem

What phase change is endothermic