Otro
CHE1503/102/0/2024 2 Assignment 1 UNISA General General Chemistry I (Practical) CHE1503
- Grado
- Institución
CHE1503/102/0/2024 2 Assignment 1 UNISA General General Chemistry I (Practical) CHE1503
[Mostrar más]Vista previa 3 fuera de 17 páginas
Vista previa 3 fuera de 17 páginas
Añadir al carrito
Añadir al carrito
2 reseñas
Por: meganboshoffpm • 6 meses hace
Por: ayandamhlongwa • 6 meses hace
Vendedor
SeguirTutorMaster0820448712
Comentarios recibidos
Vista previa del contenido
SOLUTIONSPage 1 of 17
,PART A SOLUTIONS
QUESTION 1
How does the law of conservation of matter apply to chemical and physical
changes? Provide a reaction in each case to support your answer. (4
marks)
SOLUTION
Yes, the law of conservation of mass applies to physical changes. The law of
conservation of mass states that in a chemical reaction mass is neither created nor
destroyed.
Example
The carbon atom in coal becomes carbon dioxide when it is burned. The carbon atom
changes from a solid structure to a gas but its mass does not change.
C(s) + O2(g) -> CO2(g)
QUESTION 2
(a) Design an experiment to separate a given heterogeneous mixture into its
individual components. (You do not need to use chemistry equipment, what
everyday items could you use?)
SOLUTION
(a) Magnetic separation
The following diagram shows how magnetic separation can be used to separate a
mixture of components. In the example, mineral ore that contains two compounds (one
magnetic, and the other non-magnetic) is being separated. The ore grains are fed onto a
revolving belt. The roller on the end of the belt is magnetic. This means that all the
magnetic grains in the ore will stick to the belt when it goes around the roller, while the
non-magnetic grains will fall off the end. As soon as the magnetic grains move past the
magnetic roller, they will also fall down.
Page 2 of 17
, b.) Would you be able to separate a homogenous mixtures ? Explain why you would
say yes or no. (3 marks)
SOLUTION
Evaporation
Evaporation is a technique used to separate out homogeneous mixtures that contain
one or more dissolved salts. The method drives off the liquid components from the solid
components. The process typically involves heating the mixture until no more liquid
remains. Prior to using this method, the mixture should only contain one liquid
component, unless it is not important to isolate the liquid components. This is because
all liquid components will evaporate over time. The evaporation method is suitable to
separate a soluble solid from a liquid.
In many parts of the world, table salt is obtained from the evaporation of sea water. The
heat for the process comes from the sun.
Page 3 of 17
Los beneficios de comprar resúmenes en Stuvia estan en línea:
Garantiza la calidad de los comentarios
Compradores de Stuvia evaluaron más de 700.000 resúmenes. Así estas seguro que compras los mejores documentos!
Compra fácil y rápido
Puedes pagar rápidamente y en una vez con iDeal, tarjeta de crédito o con tu crédito de Stuvia. Sin tener que hacerte miembro.
Enfócate en lo más importante
Tus compañeros escriben los resúmenes. Por eso tienes la seguridad que tienes un resumen actual y confiable. Así llegas a la conclusión rapidamente!
Preguntas frecuentes
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
100% de satisfacción garantizada: ¿Cómo funciona?
Nuestra garantía de satisfacción le asegura que siempre encontrará un documento de estudio a tu medida. Tu rellenas un formulario y nuestro equipo de atención al cliente se encarga del resto.
Who am I buying this summary from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller TutorMaster0820448712. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy this summary for 16,52 €. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
45,681 summaries were sold in the last 30 days
Founded in 2010, the go-to place to buy summaries for 14 years now