Question

1. provide the key - term that corresponds to each of the following definitions:

(a) the amount of mass in a unit volume of matter; for example, 1.00 g/ml.
(b) a process for obtaining the mass of a sample by first weighing a container and then weighing the container with the sample.
(c) the degree of inexactness in an instrumental measurement.
(d) to rinse glassware (e.g., a pipet) with a sample liquid to avoid dilution by water on the inside surface.
(e) the curve lens at the surface of a liquid inside a graduated cylinder.
(f) determining volume of a sample by measuring the volume of water displaced.
key terms: condition, density, meniscus, uncertainty, volume by displacement, weighing by difference.

1. a 10.0 - ml sample of liquid is pipetted into a 125 - ml flask with stopper. the mass of liquid is found to be 7.088 g. refer to example exercise 1 and calculate the density of the liquid.
2. state the volume of liquid shown in each of the following graduated cylinders.

Explanation:

1.

(a) Density is defined as mass per unit volume.
(b) Weighing by difference is the process of obtaining sample mass by weighing container - with and without sample.
(c) Uncertainty represents the degree of inexactness in a measurement.
(d) Conditioning is rinsing glassware with sample liquid to avoid dilution.
(e) Meniscus is the curved surface of a liquid in a graduated cylinder.
(f) Volume by displacement is determining sample volume via water displacement.

Step1: Recall density formula

The formula for density $
ho=\frac{m}{V}$, where $m$ is mass and $V$ is volume.

Step2: Substitute given values

Given $m = 7.088\ g$ and $V=10.0\ mL$. Then $
ho=\frac{7.088\ g}{10.0\ mL}=0.7088\ g/mL$.

We need to read the volume at the bottom of the meniscus. But without proper scale details from the image, we can't give exact values.

Answer:

(a) density
(b) weighing by difference
(c) uncertainty
(d) conditioning
(e) meniscus
(f) volume by displacement

2.