Cheezel

Most popular questions and responses by Cheezel
  1. Chemistry, que 10

    How many atoms are present in one formula unit of calcium hydrogen carbonate Ca(HCO3)2? Could someone explain to me why the answer is 11? Thank you.

    asked on October 22, 2016
  2. Chemistry PLS HELP

    The cover plate is removed from the gas jars shown iin the diagram. Nitrogen dioxide is a brown gas. After several days, the color of the gas is the same in both of the jars. What explains this change? So the picture shows this jar and nitrogen and

    asked on June 23, 2016
  3. Qualitative analysis

    Aqueous sodium hydroxide is added to a mixture of an aqueous solution of X with some aluminium alloy. On warming, ammonia gas is evolved. When X is treated with aqueous ammonia, a white precipitate that is soluble in excess aqueous ammonia is obtained.

    asked on November 17, 2016
  4. Qualitative analysis

    Which ion reacts with aqueous sodium hydroxide to give a precipitate that dissolves in an excess of sodium hydroxide? A Ca2+ B Fe2+ C Fe3+ D Pb2+ Pls explain how to get the ans, thks!

    asked on November 17, 2016
  5. Qualitative analysis ( Chemistry)

    A solution x forms a white precipitate with dilute sulfur in acid and also with aqueous silver nitrate. What could solution x contain? A) Barium Chloride B) Barium nitrate C) Magnesium chloride D) Magnesium chlorine Could someone tell me how to get the

    asked on November 17, 2016
  6. Qualitative analysis

    X is a solution containing both sodium chloride and sodium sulfate. Three of the following solutions will produce a white precipitate on addition of X. Which one remains clear? A) Aqueous ammonia C) Lead(ll) nitrate B) Barium chloride D) Silver nitrate

    asked on November 17, 2016
  7. Math easy HELP

    Written as the product of its prime factors, 360=2^3 times 3^2 times 5. So find the smallest positive integer k such that 360k is a cube number.

    asked on June 29, 2016
  8. Organic chemistry (QA)

    In which solutions will a white precipitate be observed when aqueous copper (ii) chloride is added to it? A) Sodium hydroxide B) Potassium carbonate C) Lead (ii) nitrate D) Magnesium Sulfate Could someone tell me the ans and explain it to me, thk u!

    asked on November 17, 2016
  9. Qualitative analysis

    Solid S has the following properties: I :It is insoluble in water. II :It produces a gas when heated. III: It produces a gas when added to dilute sulfuric acid. What could S be? A Calcium oxide C Zinc nitrate B Copper(lI) carbonate D Sodium hydroxide

    asked on November 17, 2016
  10. Qualitative analysis (Chem)

    Aqueous ammonia reacts with aqueous solution of metal ion X to produce a coloured precipitate. The colour of the precipitate changes slowly on standing in air. What could be ton X? A Al 3+ B Cu2+ C Fe2+ D Fe3+ Pls explain how to get the answer, thks!

    asked on November 17, 2016
  11. Qualitative analysis

    A solution reacts with calcium carbonate to produce a gas. It does not produce a precipitate with either aqueous barium chloride or acidified silver nitrate. Which of the following does the solution contain? A HI B H2S04 C HNO3 D HCl Could someone explain

    asked on November 17, 2016
  12. Math HELPPPPP

    a) Find the gradient of the line x/7+y/11=1. b) the straight line Y=mx+c is parallel to the line y+ 5/3x=7/3 and passes through the point (2,3). Find the values of m and c The answer for a is -11/7x And b us 6 1/3

    asked on June 25, 2016
  13. SIMULTANEOUS EQUATION

    Solve the equation 5x^2-5x-63=0 by using the "complete the square" method. Give your answer to 2 decimal place. Please show me in clear steps how to get the answers 4.08 and -3.08.

    asked on June 24, 2016
  14. Simultaneous equation

    Solve the equation 5x-3y=14 and 3x+5y=18 using substitution. The ans is x=3 11/17 and y= 1 7/17 I couldn't get the above answers, could someone show me clearly how to get those answers, thank you.

    asked on June 24, 2016
  15. Math HELPPPPP

    a) Find the gradient of the line x/7+y/11=1. b) the straight line Y=mx+c is parallel to the line y+ 5/3x=7/3 and passes through the point (2,3). Find the values of m and c The answer for a is -11/7x And b us 6 1/3

    asked on June 24, 2016
  16. Math

    Solve the equation e^x-10=10. Do I have to change it to log form? What do I do after that?

    asked on May 30, 2016
  1. Preschool teacher needs your help... thx a mill

    Give the rewards when they get the questions right! It should help:)

    posted on May 30, 2016
  2. Math

    Maybe you could go on YouTube for some fun songs that teach counting, there are a lot of them! Or perhaps use flashcards to teach her, she needs to understand before she can practise. You certainly can't wait until she is ready, children mostly want to

    posted on May 30, 2016
  3. music

    Gu Zheng is a Chinese instrument. It is a string instrument if I am not wrong.

    posted on May 30, 2016