Science- Metals, Biochemistry, Light

• Malleable ?

  Can change shape or bend
• What are the properties of metals ?

  .Hard, Smooth, Shiny when polished , Ductile and Malleable , Good conductors of heat and electricity , Dense
• What is corrosion ?

  .When an acid breaks down a metal
• What is a thermite reaction?

  A very exothermic reaction
• What types of metals are easier to extract ?

  Less reactive metals
• What is an alloy ?

  A mixture of elements where at least one element is a metal
• What are the 5 types of alloys ?

  .Bronze, Brass, Steels , Gold, Nitinol
• What is aerobic respiration ?

  Glucose + oxygen -> Carbon dioxide + water + energy
• How can you extract metals?

  Chemically, or electrically
• How does gas exchange occur ?

  It happens between the alveoli and blood vessels . Oxygen is diffused from the alveoli to the capillary , and carbon dioxide diffuses from the capillary to the alveoli
• What adaptations do alveoli have ?

  1. .They are large and flat to provide a large surface area.
  2. Just like capillaries they are only one cell thick , so the airtight pathway is thin
• How does glucose get into our cells ?

  Starch we eat is digested into glucose in the small intestine , which gets absorbed into the bloodstream.

  The glucose is taken around your body via plasma and taken to cells then gets used by mitochondria for respiration
• What is energy needed for ?

  Movement, Keeping warm, Growth and repair
• What is the chemical formula for respiration?

  C6+H12+6O2-> energy+6CO2+6H2O
• What is the formula for plant respiration?

  Carbon dioxide + water -> Glucose and oxygen
• How is glucose used in plants?

  Respiration, Storage as starch , used to make new chemicals
• What different feature do guard cells have ?

  .Their shape can change
• What is light ?

  An electromagnetic wave
• What is the first rule of reflection ?

  The angle of incidence = the angle of reflection
• What is refraction?

  Refraction is the bending of light as it passes from one medium to another, because it is denser.
• What is white light made of ?

  .All light
• Red and blue?

  Magenta
• Red and green?


  Yellow
• Blue and green ?


  Cyan
• How do colour filters work ?

  .They absorb all light but the colour / colours used to make the colour of the filter
• What is a predator prey relationship ?

   the interactions between two species where one species is the hunted food source for the other.
• Some acids?

  Hydrochloric acid ,Vinegar, Ethanoic acid , Lemon juice
• What is an Acid ?

  .Something that when disassociates, gives out hydrogen ions .
• What is an alkali ?

  .When dissolved in water dissociates to give out a hydroxide ion .
• What is a pH indicator ?

  A substance that changes color in response to pH levels.
• What can you use to test pH other than indicator s?

  pH probes
• if the acid is HCl , and the alkali is Sodium hydroxide , what is the word equation?

  Hydrochloric acid + Sodium hydroxide-> Water + Sodium chloride
• What is the general word equation for neutralisation?

  Acid + Alkali = salt + water
• What is the word equation for an acid and metal ?

  .Acid +metal = Hydrogen and salt , which is also the squea pop test
• What is the word equation for an acid and metal carbonate ?

  Acid + Metal carbonate -> Salt + Water + Carbon dioxide
• What is the general word equation for the reaction of an acid with a metal above hydrogen in the reactivity series ?

  .Acid + reactive metal -> Hydrogen gas + salt
• What are 4 effects of acid rain ?

  .Chemical weathering causing erosion

  Leaching of metals

  Water acidifying

  Nutrient depletion
• how do you make an insoluble salt ?

  Choose an acid and base to use , disslove in water, remove ecsess solid , and dry the salt
• What is the chemical symbol for Hydrochloric Acid ?

  HCl