Phases of Matter
What does the word "indefinite" mean when talking about phases of matter?
¿Qué significa la palabra "indefinido" cuando se habla de fases de la materia?
can change
The temperature at which a substance melts
melting point
Physical or chemical? rusting
chemical
pure substance or mixture? CuCl2
pure substance
The elements in a(n) __________are always in the same ratio no matter where they come from.
Los elementos en un _____________ siempre están en la misma proporción sin importar de dónde vengan.
compound
What does the word "definite" mean when talking about phases of matter?
¿Qué significa la palabra "definida" cuando se habla de fases de la materia?
cannot change
gas to liquid
condensation
intensive or extensive? texture
intensive
homogeneous or heterogeneous? air
homogeneous
The mass of the reactants before a reaction equals the mass of the products after the reaction.
La masa de los reactivos antes de una reacción es igual a la masa de los productos después de la reacción.
Law of Conservation of Mass / Matter
definite volume, definite shape
solid
liquid to gas
vaporization (boiling / evaporation)
Physical or chemical? ability to react with water
chemical
homogeneous or heterogeneous? granite
heterogeneous
The energy in a system is never gained or lost, it just changes forms.
La energía en un sistema nunca se gana ni se pierde, simplemente cambia de forma.
Law of Conservation of Energy
gas
What happens to the temperature of a substance during a phase change?
¿Qué sucede con la temperatura de una sustancia durante un cambio de fase?
It stays the same.
Physical or chemical? solubility
physical
pure substance or mixture? brass (made of copper and zinc)
mixture
A compound contains the same elements in the same proportion by mass, regardless of how much you have of the sample or where you get it from.
Un compuesto contiene los mismos elementos en la misma proporción en masa, independientemente de la cantidad que tenga de la muestra o de dónde la obtenga.
Law of Definite Proportion
definite volume, indefinite shape
You remove an ice cube from your freezer and it melts. Draw and label a heating curve showing the temperature over time.
Sacas un cubito de hielo de tu congelador y se derrite. Dibuja y etiqueta una curva de calentamiento que muestre la temperatura a lo largo del tiempo.
Your heating curve should show the temperature starting below 0C. Once the temperature reaches 0, there should be a flat line showing that temperature stayed the same during melting. The temperature should then continue to increase.
Define 'extensive property' and give an example.
A property that depends on the amount of matter, ex: mass, length, volume
The physical combination of two or more metals with a uniform composition
alloy
A piece of magnesium with a mass of 48.61 g is burned. As it burns, magnesium oxide (MgO) powder is formed. The new mass is 80.60 g. Explain where the additional mass came from and why this reaction DOES follow the Law of Conservation of Matter / Mass.
Se quema un trozo de magnesio con una masa de 48.61 g. Al arder, se forma polvo de óxido de magnesio (MgO). La nueva masa es 80.60 g. Explique de dónde vino la masa adicional y por qué esta reacción SÍ sigue la Ley de Conservación de la Materia/Masa.
The new substance formed was MgO. The magnesium reacted with oxygen in the air. The oxygen atoms caused the mass to increase. New matter was not created since the oxygen came from the air.