Table of Contents
- 1 What happened to the amount of water in the test tube after heating?
- 2 What is the function of glass tubing?
- 3 What happened to the water when heated?
- 4 How does liquid in a thermometer rise?
- 5 How do you carry glass tubing?
- 6 What precaution should be considered when a test tube has been heated or being heated?
- 7 How is a soap bubble connected to a glass tube?
- 8 Why does the level of water rise after a flame goes out?
What happened to the amount of water in the test tube after heating?
The water in the testtube expands as it is heated. There is only one direction to expand in, the glass tube. This glass tube is narrow so that a small change in volume will result in a considerable change in height; your signal is amplified.
Why does the liquid inside the tube of the thermometer go up and down?
When heated, the molecules of the liquid in the thermometer move faster, causing them to get a little further apart. This results in movement up the thermometer. When cooled, the molecules of the liquid in the thermometer move slower, causing them to get a little closer together.
What is the function of glass tubing?
Laboratory glass tubingis used in many laboratories or industrial workplaces to connect other items of glassware or equipment and to convey or deliver chemicals, solvents, liquids, gases and other products. Lab glass tubing is normally manufactured from borosilicate glass for the most demanding applications.
Why is the glass tube rotated while heating?
While heating, the glass tube should be rotated in order to ensure uniform heating. Never bend the glass tubing by force. Doing so can break the tubing.
What happened to the water when heated?
When water is heated, it expands, or increases in volume. When water increases in volume, it becomes less dense. As water cools, it contracts and decreases in volume. When water decreases in volume, it becomes more dense.
Why was the water in test tube A boiled?
Boiling Water in a Test Tube by Holding it in the Hand Introduction: When heated, water above the source of heat gets heated while water below the source of heat remains as it is. The heat gets transferred without movement of the particles. This mode of heat transfer is called conduction.
How does liquid in a thermometer rise?
The liquid in the thermometer goes up when the thermometer is heated because heating makes the alcohol molecules of the liquid move faster. The extra speed of the molecules competes with their attraction for one another and causes them to move slightly further apart.
How does temperature affect water molecules?
An increase in temperature caused the water molecules to gain energy and move more rapidly, which resulted in water molecules that are farther apart and an increase in water volume. When water is heated, it expands, or increases in volume. When water increases in volume, it becomes less dense.
How do you carry glass tubing?
Grasp a length of glass tubing that has been fire-polished at both ends. Hold the center of it lengthwise in the flame, just at the top of the blue region. This is the hottest part of the flame. Rotate the tubing in the flame to heat approximately a 5-cm section uniformly, until it becomes soft and just begins to sag.
How will you round off the ends of glass tube while drawing a jet?
Gently rotate the tube until the portion which is in contact with the flame becomes red hot and softens. Remove the glass tube from the flame and pull the ends apart slowly and smoothly until it becomes narrow in the middle and then stretches into a fine jet.
What precaution should be considered when a test tube has been heated or being heated?
- Always wear safety glasses.
- Always point the test tube away from any other person in the lab.
- Heat the test tube being held at an angle so there is a way for the gases produced to escape safely.
- Heat the test tube at the top of the solution not the bottom where a gas bubble can cause an explosion.
How to prevent a cut in a glass tubing?
Prevent cuts by using the correct technique for this procedure. The hole should be lubricated with glycerol or water to facilitate the movement of the glass tubing. The glass should not be gripped directly with the hands, but rather by means of cloth towels. The towels will protect your hands if the glass should break.
How is a soap bubble connected to a glass tube?
Procedure with a glass tube with a three-way valve: Perpare soapy solution in the beakeer. Open the valve from the inlet into one end of the tube. Wet this tube end in the soapy solution, blow out a small bubble and close this end of the tube with the valve.
What happens when you remove an Ice Cube from water?
The cube will rise until the volume remaining under the surface displaces only one ounce of water. If you could remove the ice cube and leave a ‘hole’ in the water where the cube used to float without disturbing the surrounding water, that hole would take exactly one ounce of liquid water to fill.
Why does the level of water rise after a flame goes out?
Simply put, the water would rise imperceptibly at a steady rate as the oxygen were consumed. You likely saw the level rise almost all at once and pretty much after the flame went out. At first, the flame heats the air inside the container and this hot air expands quickly.