This is how krypton appears in the periodic table. Rounded to the nearest whole number, how many protons are in an atom of krypton? 36 48 84 120

True or False? A change in color is evidence of a chemical reaction

The key on a pie chart represents ...

How can an isotope like carbon 14 be used to date dead organisms

Why can a liquid take the shape of the bottom of its container?

If an oxygen nucleus consists of eight protons and eight neutrons, the charge on that nucleus is positive.

In the chemical laboratory, why do scientists use a mortar and pestle? a. to increase surface area of a solute b. to decrease surface area of a solute c. to increase temperature of a solute d. to decrease temperature of a solute

Is a mixture being separated into two elements a chemical change

Which electrons are lost by an atom of iron when it forms the Fe3 + ion? A. One s orbital electron and two d orbital electrons B. Two s orbital electrons and one d orbital electron C. Three s orbital electrons D. Three d orbital electrons

What does a three letter chemical symbol mean

When 21.6 g of carbon were burned in the presence of 73.7 g of oxygen, 16.1 g of oxygen remained unreacted. What mass of carbon dioxide was produced?