Question

what is it? identifying substances by density
the densities of three metals are shown:

• iron, 7.8 g/ml
• tin, 7.3 g/ml
• titanium, 4.5 g/ml

determine the identities of the unknown samples based on their densities.

1. sample a: 225 grams, 50 milliliters choose
2. sample b: 365 grams, 50 milliliters choose
3. sample c: 780 grams, 100 milliliters choose

Explanation:

Step1: Recall density formula

Density $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume.

Step2: Calculate density of Sample A

$
ho_A=\frac{225\ g}{50\ mL} = 4.5\ g/mL$.

Step3: Calculate density of Sample B

$
ho_B=\frac{365\ g}{50\ mL}=7.3\ g/mL$.

Step4: Calculate density of Sample C

$
ho_C=\frac{780\ g}{100\ mL}=7.8\ g/mL$.

Step5: Match with known densities

Sample A has density of titanium, Sample B has density of tin, Sample C has density of iron.

Answer:

1. Titanium
2. Tin
3. Iron