Science Quiz: Safety + Equipment + Exp.: Salted Water, Pendulum

Why do you use safety goggles? (question form Adriana)

Answer explanation

To use safety goggles, first ensure they fit snugly over your eyes. Adjust the straps for comfort and secure them in place. Always wear them in environments with potential eye hazards, such as during chemical handling or power tool use.

Why is it important to check if everything is secure in a lab? (Benjamin)

• To help you work better together

• To make sure that the experiment is safe to work with

• To take a nice picture

• For decoration

Answer explanation

Checking if everything is secure in a lab is crucial to ensure that the experiment is safe to work with. This helps prevent accidents and ensures the safety of all personnel involved.

What is the purpose of wearing a lab coat?

• To keep your hair out of your face

• To wear it as an accessory

• To let it stand on your lab table

• Wearing it on your eyes to prevent getting blind!

Answer explanation

Wearing a lab coat is primarily for protection, not for wearing on the eyes. It helps prevent contamination and protects against spills, making the choice 'Wearing it on your eyes to prevent getting blind!' incorrect.

When do you use a fire extinguisher (CO_2; Powder extinguisher)? (Egan)

• When someone's clothes are on fire - after the clothes have been removed.

• When someone's hair/body is on fire.

• If there is any kind of fire in the room.

• When the room has a fire that can spread further.

Answer explanation

You should use a fire extinguisher when someone's clothes are on fire - after the clothes have been removed - to quickly extinguish the flames and prevent serious injury. This is a critical situation where immediate action is necessary.

Don't use fire extinguishers on people who are on fire. This could hurt them. The best thing to do is to stop, drop, and roll.

Stop: Stop adding oxygen.

Drop: Get down to stop the flames from spreading.

Roll over and over to put out the flames.

You can also use a fire blanket to put out the flames. If you do use a fire extinguisher, make sure you're very careful. Use a CO2 extinguisher, for example, and aim it at the lower areas of the clothing.

Which one is the airflow ring? (Lina)

• C

• D

• B

• A

• E

Answer explanation

The air flow ring, identified as option E, is specifically designed to optimise airflow within the system. By adjusting the ring, you can produce different types of flames, such as a luminous safety flame or a non-luminous blue flame. The other options (B, C, D) do not perform this particular function.

If the length of the string attached to the pendulum increases, how will this affect the pendulum's speed (complete periods per minute)? (Iourin)

• It won't have any effect on it, the speed will be the same even with the difference.

• The speed will change and become faster. Because the length of the rope is longer, it's also faster.

• The speed will change. It will slow down. If the rope gets longer, it will take more effort to make it go faster, so it will go slower.

• All of the above are incorrect

Answer explanation

As the length of the pendulum increases, the period of the pendulum also increases, leading to a decrease in speed. A longer rope means it takes more time to complete a swing, resulting in slower motion. https://phet.colorado.edu/sims/html/pendulum-lab/latest/pendulum-lab_all.html.

Other factors that are less important and that have an impact on the period are as follows:

1. Length of the Pendulum: The most significant factor affecting the period of a pendulum is its length. A longer pendulum will have a longer period, meaning it swings more slowly overall.

2. Gravitational Acceleration: The local acceleration due to gravity also affects the period. A stronger gravitational field (as on a planet with greater gravity than Earth) would result in a faster period.

3. Amplitude of Swing: For small angles (typically less than about 15 degrees), the amplitude does not significantly affect the period due to the small-angle approximation. However, for larger amplitudes, the period can increase slightly.

4. Mass of the Bob: In an ideal pendulum, the mass does not affect the period. However, in real-world applications where air resistance and friction at the pivot are factors, a heavier bob might experience less relative deceleration due to air resistance, impacting its speed slightly.

5. Air Resistance: For pendulums swinging through the air, drag can reduce the speed of the pendulum, particularly if the bob has a large surface area relative to its mass.

6. Friction at the Pivot: Any friction where the pendulum is attached can slow it down over time, affecting the speed and damping its motion.

How many dam (Decameter) are 16 Mm (Megameter)?

• 16000

• 160000

• 1600000

• 16000000

Answer explanation

To convert 16 Megameters (Mm) to dam (decameters), multiply by 1000(Mm-km)*10(km-ham)*10(ham-dam)=100000. Thus, 16 Mm = 1600000 dam.
To convert from megameters to decameters, you need to understand the metric prefixes:

1. Megameter (Mm): 1 megameter is (10⁶) meters.

2. Decameter (dam): 1 decameter is (10¹) meters.

4. To convert 16 megameters to decameters, follow these steps:

5. Convert megameters to meters: 16 Mm = 16*10⁶ m
   

6. Convert meters to decameters: 16*10⁶ m = 16*10⁵ dam
   

So, 16 megameters is equal to 1 600 000 decameters

How do you use a fire extinguisher? (Esmee)

• Pull the pin - Aim low - Squeeze - sweep the outlet side to side.

• Aim low - pull the pin - sweep the outlet side to side - Squeeze.

• Sweep the outlet side to side - pull the pin - Aim low - Squeeze.

• Pull the pin - Squeeze - Aim low - sweep the outlet side to side.

Answer explanation

The correct way to use a fire extinguisher is often remembered by the acronym "PASS," which stands for:

1. Pull the pin: Remove the pin to unlock the operating lever.

2. Aim low: Direct the nozzle at the base of the fire.

3. Squeeze: Squeeze the handle to release the extinguishing agent.

4. Sweep: Sweep the nozzle from side to side at the base of the fire until it is extinguished.

What is this piece of laboratory equipment called? (Lotte)

• Ceramic square

• Condenser

• Wire gauze

• Buret

Answer explanation

A wire gauze is a common piece of laboratory equipment used in conjunction with a Bunsen burner. It is typically made of a thin sheet of metal or heat-resistant material interwoven with wire mesh. The primary functions and characteristics of a wire gauze include:

1. Heat Distribution: It is placed on a ring stand between the Bunsen burner and the glassware (like a beaker or flask) to help distribute heat evenly. This prevents localized heating that could cause glassware to crack or break.

2. Support: Wire gauze provides support for glassware during heating, ensuring that it remains stable and secure on the ring stand.

3. Ceramic Center: Many wire gauzes have a ceramic center to enhance even heat distribution and to offer additional heat resistance. This ceramic center helps to spread the flame's heat more evenly across the bottom of the vessel.

4. Protection: It acts as a protective barrier between the direct flame and the glassware, minimizing the risk of thermal shock and potential breakage.

Wire gauze is essential in laboratory settings where precision and safety in heating are required.

Which one is not a real rule? (Ralph)

• Never eat or drink in the laboratory classroom.

• Tie back long hair if you work in a laboratory environment, especially with fire.

• Never run around in the (laboratory) classroom

• Run away if something goes wrong

Answer explanation

The statement 'Run away when anything goes wrong' is not a real rule, as it promotes panic instead of safety. The other options provide sensible guidelines for behavior in a classroom setting.