Question

What is the only SI base unit that includes a prefix?
    (a) meter     (b) kelvin     (c) kilogram      (d) mole     (e) second

Which is the highest temperature among the following temperatures?
    (a) 85 K     (b) 75OC      (c) 115oF     (d) 125 K

Express the number, 1292.5 x 10-17, in scientific notation.
    (a) 12.925 x 10-14    (b) 1.2925 x 10-14    (c) 1.2925 x 10-15    (d) 1.2925 x 10-13

In which of the following pairs do both
Which numbers have three significant figures?
    (i) 0.0500   (ii) 0.050   (iii) 5.00    (iv) 50.0   (v) 0.005
    (a) i, iii,v    (b) i,iii,iv    (c) ii, iii, iv    (d) iii,iv,v

The mass of a sample of iron metal is 5.932 g. If the density of iron is 7.8 g/cm3, what is its
     volume?
1.31 cm3     (b) 1.3 cm3    (c) 0.76 cm3     (d) 0.761 cm3

What is the sum of 23.45 km, 104.1 km, and 0.025 km?
    (a) 127.6 km (b) 127.56 km (c) 127.575 km   (d) 127 km

Express the following calculation to the proper number of significant figures.
    (1.36 x 10-6)(0.4) / (5.6) .
    (a).0964 x 10-6 (b) .1 x 10-6 (c) .096 x 10-6 (d) .09 x 10-6

The mass of an object is 100.0 lb. What is its mass in grams?
    (a) 4.536 x 103    (b) 4.536 x 104    (c) 4.536 x 105    (d) 4.536 x 102  

Perform the following calculations and express each answer to appropriate number of
    significant figures.
0.1357 + 0.12 – 0.037      (b) 0.458 x 16.80 x 0.096   
(c) 432.7 x 6.5 x 0.0023 / 62 x 0.103     (d) 32.44 + 4.9 – 0.304 / 82.94

Express each of the following numbers in scientific notation:
(a) 32540   (b) 0.00001234   (c) 331.12 x 105     (d) 22.23 x 10-11

.Balance the following equations. For these equations, all coefficients must be whole numbers.
        (a) Al(s)              +     HCl(aq)         →      AlCl3(aq)     +   H2(g)
        (b) NaN3(s)                                      →      Na(s)         +      N2(g)
        (c) Pb(NO3)2(aq) +    KCl(aq)         →      PbCl2(s)     +     KNO3(aq)
        (d) C2H6(g)          +     O2(g)             →      CO2(g)       +     H2O(l)   
        (e) Fe2O3(s)         +     C(S)               →      Fe(s)   +    CO(g)

Answer 1