Questions asked by fruity

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• What are dipoles? how are they related to van der waals forces?
  
• What is the melting point of pure ice at normal pressure?
  
• Does the reactivity of the elements in group II increase or decrease down the group? Why?
  
• I buy x choc ices and y orange ices and spend $2.30. I buy ten ices altogether . the choc ices cost $0.30 each and the orange ices cost $0.20 each. How many of each do I buy?
  
• Is it possible to have a category for Economics and Spanish under subjects?
  
• How do I determine the pressure in the column BC due to the gas supply? (there is a picture with question when you open)
  
• Why does water expand when frozen?
  
• What are two real life examples of expansion in solids?
  
• What are some precautions that are taken against thermal expansion?
  
• A 10cm tall tablet computer is placed vertically 20cm from a plane mirror. its image distance was found to be 20cm. What is the height of the image of the computer? and what is the magnification of this image?
  
• The lens is removed from the camera and held at a distance of 4 cm from an ant of length 2mm. what is the length of the ant? (the image distance(v) is 10cm and the focal length was 7.5cm before the lens was removed)
  
• What is one similarity and one difference between elements of group 2 and group 7?
  
• If a compound is slightly soluble is it aqueous solution or solid?
  
• What are differences between real and virtual images formed by lenses?
  
• ABCD is a parallelogram. A is the point (2,5), B is the point (8,8) and the diagonals intersect at (3.5, 2.5). What are the coordinates of C and D?
  
• A straight line through the point (0,-3) intersects the curve y^2 + x^2 -27x +41 =0 at (2,3). calculate the coordinates of the point at which the line again meet the curve. can someone please explain this to me?
  
• The hypotenuse of a right-angled triangle is (2y - 1)cm long. The other two sides are x cm and (y+5)cm in length. the perimeter of the triangle is 30cm, what are possible values of x and y?
  
• The point P(a,b) lies on the line through A(-1,-2) and B(3,0) and PA=#125#{the square root of 125}. what are the values of a and b?
  
• Why aren’t most pure metals found on the earth’s crust?