science

• electromagnets


  temporary magnets that maintain magnetism when current is passed through only
• to increase the strength of electromagnets, we can increase the number of turns in the coil, core and current
• electromagnets can be used for levitating trains
• electromagnets are used in microwaves, mobile devices and levitating trains
• like charges repel (repulsion) opposite charges attract (attraction)
• when magnets on the train and the track have like poles facing each other, they repel each other (creating a levitation effect that lifts the train)
• repulsion in levitating trains helps to support the weight of the train without physical contact, reducing friction and allowing for high-speed, smooth travel.
• attraction forces in levitating trains are used to stabilize the train laterally and longitudinally to keep it centered on the tracks. 
• combination of repulsion and attraction forces enables the train to levitate and move efficiently along the track.
• testing the prescence of proteins in foods

  crush food , add to a test tube

  add distilled water

  add biruet solution to create a liquid

  if protein is present the solution would turn from blue to red/pink/purple
• The law of reflection states: 

  • The angle of incidence equals the angle of reflection.
  • We are able to see objects as light reflects off objects into our eyes.
  • When reflection happens, it always follows the law of reflection.
• • Thermal decomposition is when one reactant breaks down into a few different products. 
  • There is always one reactant and more than one product. 
  • You have to heat the reactants to get them to decompose.
• What is the date mentioned in the study material?

  15th March 2020
• What are the reactants of photosynthesis?

  • Water
  • Carbon dioxide
  • Oxygen
• What is the first item listed under 'dna' in the study material?

  Fortn
• What is the second item listed under 'dna' in the study material?

  Attraction
• What is the third item listed under 'dna' in the study material?

  Stomach
• What is the fourth item listed under 'dna' in the study material?

  Greese + oxygen
• What is transpiration in plants?

  • Movement of water through the plant
  • Water enters through root hairs
  • Water lost through leaves/stomata
• How does water enter the plant?

  Through the root hairs
• What process allows water to enter through root hairs?

  Osmosis
• What is osmosis?

  Diffusion involving H₂O particles
• How is water lost from the plant?

  Through the leaves/stomata
• What is evaporation in the context of transpiration?

  Process of water loss through leaves
• What is the structure in the stem that helps water move into the leaf?

  Xylem
• How does water move into the leaf through the xylem?

  By osmosis
• What is the term for water lost by transpiration?

  Transpiration
• What is suction pressure in relation to water movement?

  It helps draw water up through the plant
• What are capillaries in the context of plants?

  Small vessels that transport water
• How does water absorb by the root hairs?

  Through osmosis
• What is the function of leaves in plants?

  To absorb sunlight and CO2 for photosynthesis
• Why do leaves have a large surface area?

  To maximize sunlight and CO2 absorption
• What organelles are abundant in leaves for photosynthesis?

  Chloroplasts
• What is the purpose of the waxy layer on leaves?

  To reduce water evaporation
• Why do leaves have fewer stomata on the bottom side?

  To prevent excessive transpiration
• What is the scientific term for skin in plants?

  Epidermis
• What are the key features of leaves that aid in photosynthesis?

  • Large surface area for absorption
  • Abundant chloroplasts for photosynthesis
  • Waxy layer to reduce water loss
  • Fewer stomata on the underside to minimize transpiration
• stomata - a structure found on the underside of leaves that open and close for gas exchange in plants
• guard cell - structure of the stomata that help it close and open
• chemosynthesis - reaction performed by bacteria that uses energy transferred from chemical reactions to make glucose