Chemistry-please help

posted by .

1) Metals that are above hydrogen in the reactivity series react with dilute hydrochloric acid to produce hydrogen gas. Lead is just above hydrogen in the reactivity series.I read a book that says no reaction occurs between lead & dilute acid. Why? Is it because the reaction is too slow?

2) Magnesium + Iron (II) Chloride gives Magnesium chloride + iron. What colour is the iron solid? Black?

3)When reacting a metal with steam, the delivery tube must be removed from the water in the trough before turning off the Bunsen flame. This is to prevent water from being sucked back into the hot test tube. Why will water be sucked back into the hot test tube?

Thank you!

  • Chemistry-please help -

    1) Metals that are above hydrogen in the reactivity series react with dilute hydrochloric acid to produce hydrogen gas. Lead is just above hydrogen in the reactivity series.I read a book that says no reaction occurs between lead & dilute acid. Why? Is it because the reaction is too slow?
    It is slow but one of the reasons why it is so slow (and some may say actually doesn't react) is because the surface atoms of Pb react with the HCl to form PbCl2. It just happens that PbCl2 is not soluble in water and even less soluble in HCl. Therefore, the first layer of Pb atoms do react, forming a coating of PbCl2, and that hinders further reaction.

    2) Magnesium + Iron (II) Chloride gives Magnesium chloride + iron. What colour is the iron solid? Black?
    Yes, finely divided iron is black.
    3)When reacting a metal with steam, the delivery tube must be removed from the water in the trough before turning off the Bunsen flame. This is to prevent water from being sucked back into the hot test tube. Why will water be sucked back into the hot test tube?
    Remember Charles' Law (volume vs temperature). When the gases in the heated tube cool, the volume contracts, that causes the pressure to drop and that causes the liquid to be sucked into the heated tube. Actually, you can skip the volume part and just remember that pressure decreases with decreasing temperature. When the temperature of the heated tube cools, the pressure is decreased, and the water is sucked in to equalize the pressure.

  • iwaq wefyionrs -

    qpms hraygvium chri ascvmikw xoyzmadf qrpachd dbtyhke

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. chemistry

    Use an activity series to identify two metals that will not generate hydrogen gas when treated with an acid. We never did the activity and I don't know what the answer is. Please help. Thank you. Look in your text or notes for the …
  2. Chemistry

    Metals above hydrogen in the reactivity series react with dilute hydrochloric acid or dilute sulphuric acid to give metal chloride + hydrogen. 1)Is it correct to say that we use dilute acid,not concentrated acid because the reaction …
  3. Chemistry-help needed

    1) Does Alumnium react with steam to give metal oxide and hydrogen gas?
  4. Chemistry 101

    Iron reacts with hydrochloric acid to produce iron (2) chloride and hydrogen gas.Fe (s)+ 2 HCL (aq) -FeCl2 (aq) + H2 (g).The hydrogen gas from the reaction 2.2g of iron with excess acid is collected in a 10L flask at 25 degrees celcius. …
  5. Chemistry Balancing Equations

    I really need help with balancing these equations: PLEASE HELP!! 1. Sodium Hydrogen Sulfite reacts with hydrochloric acid to produce sulfur dioxide gas, water and sodium chloride 2. Sodium nitrate reacts with hydrochloric acid to produce …
  6. Chemistry Balancing Equations

    Can you please tell me if these are correct?
  7. Chemistry

    Exhibit 8-1 For the following questions, consider the equation below. Zinc will react with a solution of hydrochloric acid to produce hydrogen gas: Zn(s) + 2 HCl(aq) ® ZnCl2(s) + H2(g) Refer to Exhibit 8-1. How many moles of hydrochloric …
  8. chemistry

    when hydrogen is fitted into reactivity series of metals , it comes immediately after
  9. science

    3.5g of zinc react with excess dilute hydrochloric acid to produce hydrogen gas at STP,calculate mas of hydrogen gas produced
  10. Chemistry

    A.) Write a balanced chemical Eq'n for a reaction between MAGNESIUM & HYDROCHLORIC ACID. Answer: Magnesium + Hydrochloric Acid Mg (s) + 2 HCL (ag) ---- MgCl2 (aq) H2(g) B.) Assuming 7.00 g of Magnesium completely react according to …

More Similar Questions