Chapter 5 Flashcards
Metals are ______ when they are freshly cut or polished
shiny
What does malleable mean
can be hammered into shape
what does ductile mean
can be drawn out into wires
what does sonorous mean
make a ringing sound like a bell when they are hit
What are properties of metals
Metals are:
-shiny
-malleable
-ductile
-sonorous
-conduct heat energy
-magnetic
-many are solids at room temperature
What are the properties shared by almost all non-metals
Non-metals looks dull
Non-metals do not reflect light very well
Non-metals surface are not as smooth as metals
Non-metals that are solids are brittle, may shatter if dropped
Non-metals do not conduct heat energy well
Non-metals are known as insulators
Non-metals, most are gases at room temperature
What are metal mixtures called?
alloys
Bronze is an alloy made by mixing which elements?
copper and tin
Is bronze harder than either copper or tin?
Yes
Is steel an alloy?
Yes
Steel is a mixture of which elements?
iron and carbon
What advantage do alloys have over original/pure metals
The layers of atom can’t slide over each other as easily. The alloy is alot harder and stronger than the original metal
What are example of objects that are made with alloys?
Coins
Jewellery
Aeroplanes
Artificial joints
Modern Alloys
What does a 24 carat gold mean?
It is a pure gold
how many carat is a pure gold
24 carat
What does 24 carat gold mean
24 parts out of 24 are old
What does 18 carat gold mean
18 parts out of 24 of pure gold
Is copper an element or mixture?
Element
What is the Melting Point, Properties and Example uses of copper?
Copper has a melting point of 1085 degrees, it’s very ductile and malleable and it conducts heat and electricity well.
Example uses: electrical wiring and heating pipes
Is Zinc an element or mixture?
element
What is the Melting Point, Properties and Example uses of Zinc?
It’s melting point is 419.5 degrees, it is less ductile and malleable than copper, it conducts heat and electricity less well than copper
Example uses: cover iron in a thin layer to prevent it from rusting
Is Brass an element or mixture?
Mixture
What is the Melting Point, Properties and Example uses of Brass?
Brass has a melting point of 900-1000 degrees is less ductile than copper, more malleable than zinc and copper, it conducts heat and electricity less well than zinc
Example: musical instruments
Which alloys are corrosion resistant?
Brass and Bronze
Is tin a mixture of an element?
element
What is the Melting Point, Properties and Example uses of tin?
Tin has a melting point of 232’C
Tin is soft,ductile and malleable and conducts electricity less well than copper
Tin does not corrode readily
example: coating the inside of food cans
What is the Melting Point, Properties and Example uses of Bronze?
Melting Point of 860-1150
less ductile than copper, hard and brittle
good conductor of electricity
corrosion resistant
example: ship fittings, bells
is Bronze a mixture or element?
mixture
what is the use of condenser
To separate the mixture of two liquids
Some acids are strong, they are _____
corrosive
Dilute acids are_____ they can _____ your skin
harmful, irritate
what are examples of alkalis that are in cleaning products
sodium hydroxide
What happens when acids and alkalis are mixed together
They cancel each other out
Can red cabbage juice be used as an indicator?
yes
What type of plants can indicators be made from?
red cabbage, blackcurrant and beetroot
What is a litmus?
Litmus is a very common indicator, it is a dye.
What is the purpose of an universal indicator
universal indicator shows how acidic or alkaline a substance is
What is the colour of strong acid
red
What is the colour of weak acid
yellow
What is the colour of neutral
green
What is the colour of weak alkaline
blue
What is the colour of strong alkaline
purple
What type of scale is the strenghts of acids and alkalis measured on?
pH scale
what is the number on the pH scale if the substance is acidic
0 to 6
What is the number on the pH scale if the substance is alkaline
8 to 14
What is the number on the pH scale if the substance is neutral
7
