TUBAGON TA!

What is the standard unit of mass in the International System of Units (SI)?

• A. Gram

• B. Kilogram

• C. Ounce

• D. Pound

When measuring the temperature of a substance, which unit is most commonly used according to SI units?

• A. Celsius

• B. Fahrenheit

• C. Kelvin

• D. Rankine

When measuring the temperature of a liquid in a laboratory, you use a thermometer with the smallest reading calibration of 0.1°C. The liquid's temperature is recorded as 25.3°C. What does this calibration indicate?

• A. The temperature is measured to the nearest whole degree.

• B. The temperature is measured to the nearest tenth of a degree.

• C. The thermometer is only suitable for approximate measurements.

• D. The temperature is measured to the nearest hundredth of a degree.

You are measuring the mass of a sample using a digital balance. The balance is calibrated and shows a reading of 15.678 grams. What does this precision indicate about the measurement?

• A. The mass is estimated to the nearest gram precision.

• B. The mass is measured with a precision of 0.001 grams.

• C. The balance is not providing an accurate measurement.

• D. The mass is estimated to be the nearest tenth of a gram.

Which of the following methods is best for ensuring accuracy in measurements?

• A. Measuring only once and recording the result

• B. Using non-calibrated equipment in taking measurements

• C. Ignoring standard units in favor of arbitrary units in measurements

• D. Calibrating instruments before use and taking multiple measurements

Which of the following methods is best for ensuring accuracy in measurements? Why do we need to calibrate instruments before use in an experiment?

• A. It decreases the need for multiple trials in measurements.

• B. It ensures or provide accurate and consistent measurements.

• C. It allows for subjective interpretation of results in measurements.

• D. It eliminates the requirement for standard units of measurements.

In a solution, what is the role of the solute?

• A. The solute is the liquid part of the solution.

• B. The solute is the substance dissolves by the solvent.

• C. The solute is the substance that dissolves the solvent.

• D. The solute is always present in a larger quantity than the solvent.

You are preparing a batch of lemonade by mixing 200 grams of lemon juice concentrate into 1 liter of water. After thorough mixing, you end up with 1.2 liters of lemonade. In this lemonade solution, which of the following statements accurately describes the roles of the lemon juice concentrate and the water?

• A. Both lemon juice concentrate and water are solutes.

• B. Both lemon juice concentrate and water are solvents.

• C. Lemon juice concentrate is the solvent; water is the solute. .

• D. Lemon juice concentrate is the solute; water is the solvent

40. When preparing a saline solution, salt is dissolved in water. Which of the following statements is true?

• A. The salt is the solute and the water is the solvent.

• B. The water is the solute and the salt is the solvent.

• C. Both salt and water are solvents in the saline solution.

• D. The salt and water are equally the solutes in the saline solution.

How is the concentration of a solution typically expressed in terms of mass percentage?

• A. The number of moles of solute per liter of solution

• B. The number of molecules of solute per liter of solution

• C. The volume of solute divided by the total volume of solution, multiplied by 100%

• D. The mass of solute divided by the total mass of the solution, multiplied by 100%