Semester 1 Exam 2024-2025

Front

During a chemistry experiment, Arjun accidentally spills a chemical. What is the primary purpose of wearing safety goggles in this situation?

Back

To protect your eyes from harmful substances

Answer explanation

The primary purpose of wearing safety goggles is to protect your eyes from harmful substances, especially during experiments where spills can occur. This ensures safety and prevents potential injuries.

Front

Ava is working on a chemistry experiment in the lab. Which of the following should she NOT do when handling chemicals? Read the labels carefully, Wear protective gloves, Taste a small amount to identify it, Use a fume hood when necessary

Back

Taste a small amount to identify it

Answer explanation

Ava should NOT taste a small amount to identify a chemical, as this can be extremely dangerous. Proper safety measures include reading labels, wearing gloves, and using a fume hood.

Front

In a science class, Ava is conducting an experiment. What is the primary use of a beaker in her experiment?

Back

Holding and mixing liquids

Answer explanation

The primary use of a beaker in Ava's experiment is for holding and mixing liquids. While beakers can be used for other purposes, their main function is to contain and combine substances during experiments.

Front

If a fire breaks out in the school lab while Nora and Grace are conducting an experiment, what should they do first?

Back

Alert the teacher or supervisor

Answer explanation

In case of a fire, the first step is to alert the teacher or supervisor. They are trained to handle emergencies and can take appropriate action, ensuring everyone's safety.

Front

During a science experiment, Lily needs to transfer small amounts of liquid accurately. Which piece of lab equipment should she use?

Back

Pipette

Answer explanation

Lily should use a pipette for transferring small amounts of liquid accurately, as it is specifically designed for precise liquid measurement, unlike a test tube, Bunsen burner, or thermometer.

Front

Zoe is measuring the length of a ribbon for her art project. If the ribbon is 2.5 meters long, how many millimeters is that?

Back

2,500 mm

Answer explanation

To convert meters to millimeters, multiply by 1,000. Thus, 2.5 meters x 1,000 = 2,500 mm. Therefore, the correct answer is 2,500 mm.

Front

What is the equivalent of 0°C in another temperature scale? Options: 25°F, 273.15 K, 0°F, -273.15 K

Back

273.15 K

Answer explanation

0°C is equivalent to 273.15 K in the Kelvin scale, as the Kelvin scale starts at absolute zero, which is -273.15°C. Therefore, the correct answer is 273.15 K.

Front

Mason is baking a cake and needs to measure out 4,500 grams of flour. How many kilograms of flour does Mason need?

Back

4.5 kg

Answer explanation

To convert grams to kilograms, divide by 1,000. Thus, 4,500 grams ÷ 1,000 = 4.5 kg. Therefore, Mason needs 4.5 kg of flour.

Front

Rohan is conducting an experiment in his science class and needs to convert a temperature of 50°C to Kelvin. What is the Kelvin equivalent?

Back

323.15 K

Answer explanation

To convert Celsius to Kelvin, use the formula K = °C + 273.15. Thus, 50°C + 273.15 = 323.15 K. Therefore, the correct answer is 323.15 K.

Front

Isla is trying to measure out 1 liter of water for her science experiment. Which of the following measurements is closest to 1 liter? 100 mL, 10,000 cL, 1,000 cm³, 10 dL

Back

10 dL

Answer explanation

1 liter is equivalent to 10 deciliters (dL). Therefore, 10 dL is the closest measurement to 1 liter, while the other options (100 mL, 10,000 cL, and 1,000 cm³) do not equal 1 liter.