What is the combustibility of calcium?

What is the most abundant gaseous element in the air?

Which of the following types of molecules always has a dipole moment? Linear molecules with two identical bonds. Trigonal pyramid molecules (three identical bonds). Trigonal planar molecules (three identical bonds equally spaced).

How many hydrogen atoms are in a cycloalkene with one double bond and 4 carbon atoms?

Why are water molecules polar? select one: a. they contain two kinds of atoms. b. the electrons in the covalent bonds spend more time closer to the oxygen nucleus. c. the hydrogen bonds are weak. d. they have covalent bonds?

How many moles is 15.0 grams iron (II) nitrate?

What is the mass, volume, density, and substance for Block C:

Which factors affect electronegativity? A. Number of electrons and atomic radius B. Number of unshielded electrons and density of the element C. Atomic radius and number of unshielded protons D. Density of the element and atomic radius

What is the difference between an amide and an amine? And what is a substituted amide?

Balance the following chemical equation: / text{CH}_ 4 + CH 4 + start text, C, H, end text, start subscript, 4, end subscript, plus / text{O}_ 2 / rightarrow 2 →start text, O, end text, start subscript, 2, end subscript, right arrow / text{CO}_2 +

How did the invention of the spectroscope in 1859 change the science of chemistry