How many valance electron dose an atom of oxgen have? A 6 B 4 C 2 D 8

Which of the following groups of people used chemicals found in nature to embalm their dead? A. Ancient Egyptians B. Babylonians C. Europeans D. Greeks

20. What is the area of a piece of metal foil that measures 43.9 cm by 29.21 cm? Express the answer to the correct number of significant figures. a. 128 cm2 b. 1280 cm? 1280.3 cm? d. 1280.32 cm 128.0319 cm? C. e.

When heated KClO3 decomposes into KCl and O2 if this reaction produced 31.9 g of KCl how much O2 was produced in grams

14. How is the number of neutrons in the nucleus of an atom calculated? Add the number of electrons and protons together. Subtract the number of electrons from the number of protons. Subtract the number of protons from the mass number.

This is the chemical formula for acetic acid (the chemical that gives the sharp taste to vinegar) : CH_3CO_2H An analytical chemist has determined by measurements that there are 0.054 moles of oxygen In a sample of acetic acid.

Where are digestive enzymes found in the body

If the length of one side of a square is 12.0 m, what is the perimeter of the square in units?

Why does a solution of a weak base and its conjugate acid act as a better buffer than does a solution?

Describe the different abiotic and biotic parts of an ecosystem. Identify and explain what organisms lie on each of the trophic levels.

Concentration measurements provide a quantitative measurement of the amount of solute that is dissolved in a given amount of solvent. True or false?