Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 15 views

    Chem Taster Sheet 2

    Uploaded by

    Haikalsalihin100cool
    This document provides a chemistry worksheet with questions about moles, Avogadro's number, reacting masses, and stoichiometry calculations. It includes 10 multi-part questions asking students to calculate things like the number of particles or mass of a substance given moles or moles of a substance given mass. It also asks students to calculate product masses from balanced chemical equations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd

    Chem Taster Sheet 2

    Uploaded by

    Haikalsalihin100cool
    15 views1 page
    This document provides a chemistry worksheet with questions about moles, Avogadro's number, reacting masses, and stoichiometry calculations. It includes 10 multi-part questions asking students to calculate things like the number of particles or mass of a substance given moles or moles of a substance given mass. It also asks students to calculate product masses from balanced chemical equations.

    Copyright

    © © All Rights Reserved

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document provides a chemistry worksheet with questions about moles, Avogadro's number, reacting masses, and stoichiometry calculations. It includes 10 multi-part questions asking students to calculate things like the number of particles or mass of a substance given moles or moles of a substance given mass. It also asks students to calculate product masses from balanced chemical equations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    15 views1 page

    Chem Taster Sheet 2

    Uploaded by

    Haikalsalihin100cool
    This document provides a chemistry worksheet with questions about moles, Avogadro's number, reacting masses, and stoichiometry calculations. It includes 10 multi-part questions asking students to calculate things like the number of particles or mass of a substance given moles or moles of a substance given mass. It also asks students to calculate product masses from balanced chemical equations.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    AQA AS Chemistry-Taster lesson – Sheet2: Summer Work

    Beaumont
     A mole is a measure of amount of matter. It has a numerical value, just like the word dozen =
    Chemistry
    23
    12; a mole = 6.022 x 10 particles, quite a big number (called Avogadro’s number) –here’s
    an indication how big:
     If the whole population of the Earth (≈ 6.5 billion people) were to eat 100 M&Ms
    every second it would take a mere 29 000 years!

    Using Avogadro’s Number


    1. Calculate the number of moles 2. Calculate the mass of substance 3. Calculate the relative molecular
    present in each of the following present in the following cases: mass of the following substances
    cases: and suggest a possible identity of
    each substance:

    a) 2.3 g of Na a) 0.05 moles of Cl2 a) 0.015 moles, 0.42 g


    b) 2.5 g of O2 b) 0.125 moles of KBr b) 0.0125 moles, 0.50 g
    c) 240 kg of CO2 c) 0.075 moles of Ca(OH)2 c) 0.55 moles, 88 g
    d) 12.5 g of Al(OH)3 d) 250 moles of Fe2O3 d) 2.25 moles, 63 g
    e) 5.2 g of PbO2 e) 0.02 moles of Al2(SO4)3 e) 0.00125 moles, 0.312 g

    4. Calculate the number of particles in the following substances:

    a) 0.025 moles b) 2.5 g of CO2 c) 5.0 g of Pb d) 100 g of N2

    5. Calculate the mass of the following substances:


    23
    a) 2.5 x 10 molecules of N2
    24
    b) 1.5 x 10 molecules of CO2
    20
    c) 2 x 10 atoms of Mg

    Reacting Masses
    6. Calculate the mass of H2O required to react completely with 5.0 g of SiCl4:
    SiCl4 + 2H2O  SiO2 + 4HCl

    7. Calculate the mass of phosphorus required to make 200 g of phosphine, PH 3, by the reaction:
    P4(s) + 3NaOH(aq) +3H2O(l)  3NaH2PO4(aq) + PH3(g)

    8. Lead (IV) oxide reacts with concentrated hydrochloric acid as follows:


    PbO2(s) + 4HCl(aq)  PbCl2(s) + Cl2(g) + 2H2O(l)
    What mass of lead chloride would be obtained from 37.2g of PbO 2, and what mass of chlorine gas would be
    produced?

    9. When copper (II) nitrate is heated, it decomposes according to the following equation:
    2Cu(NO3)2(s)  2CuO(s) + 4NO2(g) + O2(g).
    When 20.0g of copper (II) nitrate is heated, what mass of copper (II) oxide would be produced? What mass of
    NO2 would be produced?

    10. A blast furnace can produce about 700 tonnes of iron a day. How much iron (III) oxide will be consumed?
    Assuming coke is pure carbon, how much coke would be needed to produce the necessary carbon monoxide?
    Fe2O3(s) + 3CO(g)  2Fe(l) + 3CO2(g)
    2C(s) + O2(g) 2CO(g)

    HPa – 2010

    You might also like