Why do the properties of elements change in a regular way across a period?

How many grams are there in 7.5 X10^23 molecules of H2SO4?

Which substance would require 511 cal of heat to raise the temperature of a 125 g sample from 22.5°C to 68.8°C? A. aluminum B. brass C. copper D. platinum

Which statement describes nuclear binding energy? It is the difference between the masses of the protons and neutrons and the mass of the nucleus. It is the energy that is required to bind protons and neutrons together in a nucleus.

Calculate the energy associated with red light with a wavelength of 725 nm

A 25.00 ml sample of h3po4 solution is neutralized by exactly 54.93 ml of 0.04345 m ca (oh) 2. what is the molarity of the h3po4 solution?

How many grams of NaOH are needed to make 500 mL of a 2.5 M NaOH solution

During its life cycle, an amphibian lives both on land and in water.

An atom that contains 22 protons, 23 neutrons, and 22 electrons would have a mass of approximately

Compared with a ph of 7, a solution of ph 5 has what times/fraction of the hydrogen concentration?

Write a formulae equation to represent the combustion of carbon to form carbon dioxide and the thermal decomposition of magnesium carbonate