Which process is the primary source for energy used by living organisms on Earth?

A) Fusion in the Sun.

B) Fission in the Sun.

C) Combustion in the Sun.

D) Disambiguation in the Sun.

Carbon-14 emits beta radiation and decays with a half-life (t) of 5730 years. Assume that you start with a mass of 6000 g of carbon 14. How many grams of the isotope remains at the end of four half-lives?

The electronic configuration of an element is given below. Element 1: 1s22s22p4 Which statement about the reactivity of the element is true? A. It is reactive because it has to gain an electron to have a full outermost energy level. B.

Which of the following is a decomposition reaction? A. 2Mg+O2 - > 2MgO B. CH4+2O2 - > CO2+H2 C. 2H2O + 2Na - > 2NaOH+H2 D. CaCO3 - >CaO+CO2

A persons blood plasma is free of any anti-bodies which would cause red blood cells to clump this person has what blood type

Ta shell can hold a maximum of 32 electrons, what is the value of n?

A non-metallic atom (at. no. 9) forms a molecule of the same, containing a single covalent bond. give reason

What is Nitroglycerin in Science?

An acid (X) reacts with a base (Y) to produce Mg3 (PO4) 2. What are X and Y? X = H3PO3; Y = Mg (OH) 2 X = H3PO4; Y = Mg (OH) 2 X = H3PO4; Y = Ca (OH) 2 X = H3PO3; Y = Ca (OH) 2

What are the pros of using steel?

The atomic mass of chlorine is listed as 35.454 amu on the periodic table. It has two naturally occurring isotopes, Cl-35 and Cl-37. What are the approximate percentages of each?