Question

1. complete the following, writing your answer in standard scientific notation.

a) 0.00918 = 9.18×10⁻³
b) 754,000 = 7.54×10⁵
c) 101.325×10² = 1.01325×10⁴
d) (2×10²)(4×10¹²) = 8×10¹⁴
e) 9×10⁸ / 3×10³ = 3×10⁵
toms, elements, compounds & molecules
the particle diagram labeled figure 1 represents a(n) ____________ (element or compound). i know this beca
the particle diagram labeled figure 2 represents a(n) ____________ (element or compound). i know this beca
each particle in figure 1 is a(n) ____________ (atom or molecule).
each particle in figure 2 is a(n) ____________ (atom or molecule).

1. the density of an unknown metal was found experimentally using water displacement and the data collected is given below.

volume of water in the graduated cylinder 55.0 ml
volume of water in the graduated cylinder with metal 61.5 ml
mass of metal 30.36 g
a) calculate the volume of the metal. show your work.
b) calculate the density of the metal. round your answer to 2 places after the decimal point. show your work.
c) if the metal was titanium, calculate the percent error (hint: use your periodic table). show your work.
% error = |expected - experimental|×100 / expected

Explanation:

Step1: Calculate volume of metal

Volume of metal = Volume of water with metal - Volume of water
$V = 61.5 - 55.0=6.5$ ml

Step2: Calculate density of metal

Density formula is $
ho=\frac{m}{V}$, where $m = 30.36$ g and $V = 6.5$ ml
$
ho=\frac{30.36}{6.5}\approx4.67$ g/ml

Step3: Find expected density of titanium

From periodic - table, density of titanium $
ho_{expected}=4.50$ g/ml

Step4: Calculate percent error

Percent error formula is $\%error=\frac{\vert
ho_{expected}-
ho_{experimental}\vert}{
ho_{expected}}\times100$
$\%error=\frac{\vert4.50 - 4.67\vert}{4.50}\times100=\frac{0.17}{4.50}\times100\approx3.78\%$

Answer:

a) Volume of metal: 6.5 ml
b) Density of metal: 4.67 g/ml
c) Percent error: 3.78%