A sample composed only of atoms having the same atomic number is classified as

(1) a compound (3) an element

(2) a solution (4) an isomer

When mixing HCl (aq) and NaOH (aq) of the same concentration (1.0 m) to produce 100 mL of product solution what volume ratio produces the largest temperature change

Balmer series of emission spectrum is in visible region. What are the colours will it produce?

Condensation refers to the process when A gas turns to a liquid A liquid turns to a gas A liquid turns to a solid A solid turns to a liquid

What is the wavelength of an electromagnetic wave that travels at 3 * 108 m/s and has a frequency of 60 MHz? (1 MHz = 1,000,000 Hz)

A goat is an herbivores ture or False

2H2S (g) 2H2 (g) + S2 (g) Kc = 1.67 * 10 ^-7 at 800 C A 0.500 L reaction vessel initially contains 0.0125 mol of H2S at 800 C. Find the equilibrium concentrations of H2 and S2.

An atom has an atomic number of 9 a mass number of 19 and an electron configuration of 2-6-1 explain why the number of electrons in the second and third shells shows that this is in an excited state

How can a chemical reaction be sped up? Pack in more of the reactant to increase the_.

How does a mixture of benzoic acid and benzaldehyde can be isolated separately by extractions?

What is a compound? a) a combination of two or more substances that are not chemically combined b) a combination of two or more elements that are combined in a certain ratio