How many naturally occurring elements are there

Which statement best describes the greenhouse effect? It is a process by which plants are able to grow well in a warm, enclosed structure. It is a process by which greenhouse gases block the sun's light to penetrate the atmosphere.

What does neutron absorption accomplish in a nuclear reactor? A. It recycles the fuel. B. It speeds up the reaction. C. It slows down the reaction. D. It increases the rate of heat absorption.

Oct-1-yne (hc≡cch2ch2ch2ch2ch2ch3) reacts rapidly with nah, forming a gas that bubbles out of the reaction mixture, as one product. oct-1-yne also reacts rapidly with ch3mgbr, and a different gas is produced.

The original concentration in a sample is 5.1 x 10^9 cfu/ml. which sample volume should yield a countable plate

An energy value of 3.313 * 10^{-19} joules is needed to break a chemical bond. What is the wavelength of energy needed to break the bond? (The speed of light = 3.00 * 10¹⁰ cm/sec; Planck's constant = 6.626 * 10^{-34} J ⋅sec). A. 5.00 * 10¹⁸ cm B. 1.

Out of the following, which element has properties of both metal and nonmetal? A. Ce B. Be C. Te D. Ne

During the synthesis of a triglyceride from its subunits, how many molecules of water are produced from dehydration synthesis?

Which symbol represents a salt? C2H2 NaCl O2 C6H12O6

How many electrons does zinc lend?

Solid iron has a density of 7.9 g/cm3. Liquid mercury has a density of 13.6 g/cm3. will iron float or sink in mercury explain