Question

question: 9 of 10
point
(yes or no) (yes or no) (yes or no)
x 16 g 2 cm³ 1,400°c yes yes no
y 64 g 8 cm³ 1,400°c yes yes no
luna states that the two samples are the same substance. kaleb states that they cannot be the same substance. which student is correct and why?
a. kaleb, because the samples have different masses
b. kaleb, because the samples have different volumes
c. luna, because the samples have the same melting point
d. luna, because all the samples have identical properties

Explanation:

Step1: Calculate density of sample X

Density formula is $
ho=\frac{m}{V}$. For sample X, $m = 16\ g$ and $V=2\ cm^{3}$, so $
ho_X=\frac{16\ g}{2\ cm^{3}} = 8\ g/cm^{3}$.

Step2: Calculate density of sample Y

For sample Y, $m = 64\ g$ and $V = 8\ cm^{3}$, so $
ho_Y=\frac{64\ g}{8\ cm^{3}}=8\ g/cm^{3}$.

Step3: Analyze properties

Both samples have the same density ($8\ g/cm^{3}$) and the same melting - point ($1400^{\circ}C$). Identical substances have the same characteristic physical properties.

Answer:

D. Lua, because all the samples have identical properties