1) Explain the meaning of Law of Conservation of Mass. · Mass cannot be ? or ?.
Chemistry
1) What does it mean by reactants and products?
1. Consider the following word equation: sodium + chlorine → sodium chloride a) Is that a chemical reaction? Explain. Consider what is a chemical reaction (when reactants are converted into one or more different products. b) What is/are the product(s)? c) What is/are the reactant(s)? 2. Consider the following word equation: sodium + water → sodium hydroxide + hydrogen a) Is that a chemical reaction? Explain. b) What is/are the product(s)? c) What is/are the reactant(s)?
2) What are the evidence of a chemical reaction? Give examples.
change in change of change of form ? or ?
3) Balance the following equations: C5H12 + O2 -->CO2 + H2O Zn + HCl --> ZnCl2 + H2 S8 + F2 --> SF6 C2H6 + O2 --> CO2 + H2O
Start with C5H12. Because the only thing that has Carbon (C) on the right side of the equation is CO2, then the coefficient for CO2 on the right side -must- be 5.
Then we can look at the H's, in the C5H12. Because ONLY H2O on the right side has H's, the coefficient for the H2O must be 6, in order to get the right side to have the 12 H's we see in the C5H12.
Then, we add together all the O's, we made by changing the coefficients on the right side and we find 5 X 2 = 10 for the CO2 and 6 X 1 = 6 for the H2O.. so we get 16 altogether. Since the only thing with Os on the left side is O2, we can add an 8 coefficient there to get 16.
This involves thinking about multiples! Let's start with the easier atom to balance. S8 + F2→8SF6 Left side: S = 8; F = 2 Right side: S = (1 x 8) = 8; F = (6 x 8) = 48 Please notice that since SF6 is a substance, you need to multiply the coefficient, not only to S but also to F. Now to balance the F. S8 + 24F2→8SF6 Left side: S = 8; F = (2 x 24) = 48 Right side: S = (1 x 8) = 8; F = (6 x 8) = 48
4) Explain the properties of acids and bases. Use a T-chart to help your to explain. Include pH, Taste, Feel, Reaction with Litmus Paper ** red litmus turns blue for a base ** blue litmus turns red for an acid 2) Give an example of a strong acid, a weak acid, a strong base and a weak base. Strong acid completely dissociate in aqeous solution - lots of H - stomach acid; battery acid Strong base completely dissociate - lots of OH - drain cleaner Weak acid partial dissociate - orange juice Weak base partial dissociate - baking soda 3) If the pH level of a solution is 1, what kind of substance is that? Acid or base? 4) What substance can neutralise an acid? 5) What is the pH of water in general? 6) Which indicator is used to see if the solution is acid or base? How does it work? Universal Indicator. It works like a colour dye, changing the colour of the solution. Then you can use a pH scale to determine if the solution is acidic or basic. Neutralisation 1) Explain the meaning of neutralisation. The reaction of an ? and a ? 2) Write the word equation of neutralisation. Acid + Base --> Salt + Water 3) What can neutralise a bee sting and a wasp sting? Why? V 4) Which substance can neutralise lemon juice? Why? B Endothermic and Exothermic reactions Define endothermic and exothermic reactions. Use a T-Chart to compare the endothermic and exothermic reactions. Heat in the reaction Heat in the surrounding environment Example
Radiation
1) Define Radiation is the process by which energy is emitted as either particles or waves. Ionizing radiation takes a few forms: Alpha, beta, and neutron particles, and gamma and X-rays. All types are caused by unstable atoms,
Human Body Systems
1) MRS GREN M - evolutionarily important for organisms because it improves the chances of catching food or avoiding capture for both predator and prey. R S - All organisms are able to sense changes in their environment and will respond accordingly. G R E - If waste products stay inside an organism they can become toxic. N - Energy and nutrients are essential for growth, survival and reproduction.
2) 5 senses
3) parts of the ear? outer ear - auditory canal, eardrum/tympanic membrane middle ear - ossicles (3 bones) inner ear - cochlea
4) how do we hear? The sound waves travel from the outer ear and in through the auditory canal, causing the eardrum, or tympanic membrane, to vibrate. This, in turn, causes the three small bones, known as the ossicles, or the hammer, the anvil and the stirrup, in the middle ear to move. The vibrations move via the oval window through the fluid in the cochlea in the inner ear, stimulating thousands of tiny hair cells. This results in the transformation of the vibrations into electrical impulses finally perceived by the brain as sound.
5) parts of the eye
Labels: A, The Sclerotic Coat; B, The Choroid Coat; C, The Retina; D, The Optic Nerve; E, The Cornea; F, The Aqueous Humor; G, The Iris; H, The Ciliary Processes; I. The Crystalline Lens; K, The Vitreous Humor.
6) names and function of photoreceptors in retina R - help to see in low light C - colour
7) Eye Disfunctions Short Sighted - what Bianca has Long Sighted - Colour blindness - Astigmatism - problem with how the eye focuses light Cataract - clouding of the lens
8) Define Homeostasis
9) Parts of a feed back loop S R C E R
Frequency and Amplitude
If you were at the beach, frequency is how often a wave hits you and amplitude is the height of the wave.