Identify the instrument shown in the image. A) Barometer B) Nurses watch C) Spring balance D) Stop watch

Here are the solutions to your questions:

14. Identify the instrument shown in the image.

The instrument shown in the image is a device with a hook and a circular dial with numbers, typically used to measure force or weight by the extension of a spring inside. This is known as a spring balance.

• A) Barometer measures atmospheric pressure.
• B) Nurses watch is a timepiece.
• C) Spring balance measures force or weight.
• D) Stop watch measures time.

The final answer is $\boxed{\text{C. Spring balance}}$.

15. Objectives that may be achieved through the use of the laboratory in science classes include all of these except for ----

Science laboratories are designed to foster practical skills, develop cognitive abilities such as critical thinking and problem-solving, and cultivate scientific attitudes like curiosity and objectivity. Faith is a belief system and is not an objective of scientific laboratory work.

The final answer is $\boxed{\text{B. Faith}}$.

16. It is made of porcelain and used to heat small amounts of solid substances that are being heated strongly at high temperatures. This laboratory apparatus is called ----

A crucible and lid is a laboratory apparatus typically made of porcelain or ceramic. It is designed to withstand very high temperatures and is used for heating solid substances strongly, often to burn off impurities or to melt materials.

• A. A Bunsen burner is a heat source.
• B. An evaporating dish is used for evaporating liquids, but a crucible is for stronger heating of solids.
• C. A crucible and lid fits the description.
• D. A spatula is used for transferring solids.

The final answer is $\boxed{\text{C. Crucible and lid}}$.

17. A curved glass used as a beaker cover or for evaporating very small amounts of liquid is best known as ----

A watch glass is a concave piece of glass that can be used as a cover for beakers to prevent contamination or to slow down evaporation. It is also used for evaporating small amounts of liquid or for holding small quantities of solids.

• A. A mortar is used for grinding.
• B. A crucible is for heating solids at high temperatures.
• C. A test tube is a cylindrical container for reactions.
• D. A watch glass fits the description.

The final answer is $\boxed{\text{D. Watch glass}}$.