Questions asked by Jeish G.

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• What are the 3 physical properties of Barium Chloride?
  
• How does vaccination provide long term immunity?
  
• What is the difference between tissue cells and stem cells?
  
• Why does an individual have high fever when there is an infection?
  
• Why would magnesium dissolve in water?
  
• What happens in the reaction of copper in HCl?
  
• What happens when Magnesium is left in HCl for corrosion to occur?
  
• What occurs in the corrosion reaction of Magnesium in HCl?
  
• What is the outcome of reaction, of copper in HCl?
  
• What is rate of corrosion (metals) in HCl, seawater and distilled water?
  
• Why do some metals corrode whereas, some metals don't?
  
• Why is CuCl formed from the corrosion reaction of Cu(s) and HCl?
  
• What happens when magnesium is left in seawater?
  
• What is the mass of air in the room? (Question-image from the description box) below
  
• What is the volume of the oxygen gas required for this combustion reaction? (Question-image in the description box below)
  
• What is the volume of oxygen gas in the required complete combustion? Full question located as an image in the description box below.
  
• What is the mass of calcium carbonate used in part a.?
  
• What is the mass of water vapour produced?
  
• What is the volume of Carbon dioxide released at SLC per MJ of energy generated?
  
• What is the average speed for the total journey? Full question the description box below as an image.
  
• What if the volume of a cylinder as a function of it's height/radius? Full question in the description box below.
  
• What is the rule for the Area, #A m^2# of an enclosure? Full question in the description box below as an image.
  
• What is the mass of octane burnt and calculating the energy released? Full Question in the description box below.
  
• What is the energy produced per tonne of #CO2# released for each fuel?
  
• What is the mass of #CO2# formed when 1.00kJ of energy is released? Full question in the description box below as an image.
  
• How do you work out the oxidation number of an element in a compound? E.g finding the oxidation number of the element Cr from the compound #Cr2O3#
  
• How is the function #1/9*x^3 +5, x<-3# not continuous at x=1 and what type of correspondence does it display?
  
• How does the graph f(x) - g(x) look like? Full question in the description box below.
  
• A set o scores has a mean of 100 and a standard deviation of 20. What is the actual score if the standardized score is was 1.8?
  
• What is the ∆H value for this thermo chemical equation? Full question in the description box below.
  
• Coal contains small amount of sulfur. What are the implications of this small amount of sulfur for stations generating electricity using the combustion of coal?
  
• What is the value of f(g(3))? Full question in the description box below.
  
• Why might Methane be considered a more important greenhouse gas then Carbon Dioxide?
  
• If #A=((3,2), (-3,-4))# and #B=((0,-5),(-2,1))#, What are the matrices X and Y such that 2A -3X = B and 3A+2Y = 2B?
  
• How to divide the first expression by the second? : 1) #2x^3-7x^2+15x-3, x-3#
  
• What is the rule of the cubic function for which the graph passes through the points with coordinates (0,135), (1,156), (2,115), (3,0)?
  
• What is the coordinates of the point of intersection of the curve #y=1/(x+2) +3# and the line #y=-x#?
  
• What is the condition for #x^2+ax+b# to be divisible by x+c?
  
• What is the value of r?
  
• Can someone please explain to me in detail how to balance this unbalanced equation?: #I^(-)(s) + H_3AsO_4(aq) -> IO_3(aq) + AsO_3 (aq) +H_2O (l)#
  
• What is the equation for the bus ride? Full question the description box below.
  
• What is the dimension of the rectangle?
  
• How to sketch #y=2^(x+2) -1?# - Detailed explanation please
  
• How to sketch #y=3^x# ?
  
• How to sketch the graph for #y=10^(x) -1# ?
  
• For the matrices #A= [(2,1),(3,2)]# and B#[(-2,-2),(3,2)]#, how to calculate A+B, BA and kA?
  
• How to sketch the graph #f(x) = e^(x) + 1# ?
  
• Fo the equation #5x^5 + 13x^4 - 2x^2 -6, x-1# , How to divide the first expression by the second?
  
• How to solve the following for #x#? : 1) #x/(a-b) + 2x/(a+b) =1/(a^2 - b^2)# 2) #1/(x+a) + 1/(x+2a) = 2/(x+3a)#
  
• How to solve each of the following pairs of simultaneous equations for x and y? 1) #ax + y = c and x+by=d#
  
• By using the intercept method, how to find the equations of the straight lines passing through (-3,0) and (0,2)?
  
• For the following pairs of equations, how to write s in terms of a only? : 1) 3s-ah=a^2 and as+2h=3a 2) as=s+h and ah=a+h.
  
• What is the % variation in the food energy content in a packet chips? Full question in the description box.
  
• Can someone please double check if I have oxidised the number of sulfur correctly for the following ions? The question is in the description box below.
  
• The length of the line segment joining A(2,-1) and B(5,y) is 5 units. What is y?
  
• What is the value of m for which #(4m+1)x^2 - 6mx+4# is a perfect square?
  
• How to show that the equation #ax^2-(a+b)x+b=0# has a solution for all values of a and b?
  
• How to prove that the expression #x^3+(k-1)x^2+(k-9)x-7# is divisible by (x-1) for all values of k?
  
• What is the value of y?
  
• What is the value of y?
  
• How to solve the equation #log_(x) 5+log_(5) x=5/2# ?
  
• What does this mean? "For what values of x is f(x)>0?"
  
• How to transform 3x+6y=12 into intercept form? Using the formula #x/a + y/b = 1# ?
  
• What is the equation of the line which passes through the point of intersection of the lines y=x and x+y=6 and which is perpendicular to the line with equation 3x+6y=12?
  
• The length of the line segment joining A(2,8) and B(12,y) is 26 units. What is y?
  
• For (-4,1), (4,6) What is the angle that the line toning the given points makes with the positive direction of the x-axis?
  
• Given the points A(a,3), B(-2,1) and C(3,2), what is the possible values of a if the length of AB is twice the length of BC?
  
• The point (h,k) lies on the line y=x+1 and is 5 units from the point (0,2). What is the two equations connecting h and k and hence the possible values of h and k? I have written my answers below, can someone double check them?
  
• What is the value of a if the gradient of PR is -2?
  
• What is the value of m and the coordinates of C?
  
• In terms of T, what is the number of hours travelling on country roads?
  
• What are the values of b and c for which the equations x+5y=4 and 2x+by=c?
  
• How to find the value of m and the coordinates of C?
  
• How to do questions a and b?
  
• How to answer this questions: coordinates of the midpoints and finding the equations of lines AC?
  
• How to solve the following systems of simultaneous equations using matrices? 1) 2x+3y-z=12 2y+z=7 2y-z=5
  
• Using matrix methods, how to find the image of the point (1,-2) for the transformations?: 1) a dilation of factor 3 from the x-axis 2) reflection in the x-axis
  
• How to find x and y in terms of x' and y' respectively?
  
• How to find the equation of the graph of the following cubic equation?
  
• How to find the image of the straight line?
  
• How to find the image of the curve with equation #y=1/x^2#?
  
• How to do this question , in relations to transformation?
  
• How to do questions b?
  
• How to do questions b and c?
  
• How to do this question in regards of matrices and transformation?
  
• How to do question 4. a and b?
  
• How to do question 24. a and b?
  
• How to do this application question 3?
  
• How to do question 8?
  
• How to do this question 10?
  
• How to do this question 9 regarding matrices and transformations?
  
• How to do this question regarding transformations and subsequently matrices?
  
• How to find the inverse of #x^(2)-x-2#?
  
• How to find the turning points from these quadratic equations?
  
• How to find the point of intersections of diagonals?
  
• Are all biofuels a mixture, hence use #kJg^-1#and fossil fuels a pure substance?
  
• How to do this question regarding matrices and transformation (quadratic/cubic)?
  
• How to do this Q.13 question regarding matrices and transformations ?
  
• How to solve this equation by hand?
  
• How to sketch these graphs?
  
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