What are the first 15 elements on the periodic table

How are physical properties used to describe matter?

A force of 45 n is exerted on an object, resulting in an acceleration of 5 m/s2 for the object. what will the object's acceleration be if the force doubles? a. 2.5 m/s2 b. 5 m/s2 c. 10 m/s2 d. 20 m/s2

How many significant figures are in 136,000 ml?

What is the charge of the nucleus of every atom?

What is the ΔG under standard temperature for the following reaction between? NH3 (s) → NH3 (l) Given: NH3 (s) : ΔHf = - 46.11 kJ; ΔSf=192.45 J/K NH3 (l) : ΔHf = - 80.29 kJ; ΔSf=111.3 J/K

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