Chapter 4 Flashcards
What kind of special microscope can we use to see a virus
electron microscope
What are viruses’ coat made of?
protein
What is the substance inside the virus called?
RNA
What is the function of RNA
RNA is made of little threads that contain a set of coded instructions for making more viruses
What do virus have to do before they can make copies of themselves?
Viruses have to get inside a living cell
The virus forces the cell to copy the instructions on its RNA and make many new viruses when they are inside the cell and it kills the cell, what is this called?
replication
What does fertile mean
it means able to produce offspring(children)
State the properties of metal
Metals are shiny when they are freshly cut or polished
Metals are malleable, able to be hammered into shape
Metals are ductile, they can be drawn out into wires
Metals are sonorous, making ringing sound when they are hit
Metals are good conducters of heat energy
Some metals are magnetic
What are metal mixtures called?
Alloys
What is bronze an alloy of
copper and tin mixed together
Steel is a mixture of which elements?
iron and carbon
What are examples of objects made of alloys?
Coin, Jewellery and Aeroplanes
How many carat is pure gold?
24 carat
What does 18 carat gold mean?
it has 18 parts our of 24 parts 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
