Que cambios son fisicos y cuales son quimicos?

a) quemar papel

b) limpiar objetos de plata

c) hacer hielo en el congelador

d) fundir hierro

Which radioisotope has the fastest rate of decay? (1) 14C (2) 37Ca (3) 53Fe (4) 42K

Which metal reacts spontaneously with SR2 + Ions

If an element has a mass number of 232 and an atomic number of 93, how many neutrons does the element have

How long does it usually take for a rock to undergo a stage within the rock cycle

When 70.0 milliliters of 3.0-molar Na2CO3 is added to 30.0 milliliter of 1.0-molar NaHCO3, the Resulting concentration of Na 1 ions is (a) 2.0 M (b) 2.4 M (c) 4.0 M (d) 4.5 M (e) 7.0 M.

What subatomic particles do the following symbols represent in the atomic diagrams

2. You have 2 m3 of a mineral ore sample. It has a mass of 1 * 104 kg. Calculate the density of the ore sample and express your results in g/cm3 with appropriate scientific notation.

A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg. Its volume is 568 mL.

What is loamy soil?

What is the lowest possible value of n for a d atomic orbital?