Measurement Notebook Quiz 1

The correct answer is Poison Safety. When you see a safety symbol that is a picture of a skull and crossbones, it is commonly used to indicate the presence of toxic or poisonous substances. This symbol is widely recognized as a warning for potential health hazards and serves as a reminder to take necessary precautions to avoid contact with or ingestion of harmful substances.

A graduated cylinder is used to measure liquids with precision, making it the most suitable option for measuring 17.5 mL of liquid. A beaker is not as accurate for measuring small volumes, and a test tube may not have the necessary markings for precise measurements. Therefore, a graduated cylinder is the best choice for this task.

Bubbles being produced in a beaker indicate a chemical change. This is because the formation of bubbles usually involves the release of gas, which is a result of a chemical reaction taking place. In a chemical change, the substances involved undergo a transformation at the molecular level, resulting in the formation of new substances with different properties.

A significant figure (sig fig) is a digit in a number that carries meaning in terms of its precision. In the number 150.3, there are four digits: 1, 5, 0, and 3. All of these digits are considered significant because they are non-zero and are not trailing zeros after a decimal point. Therefore, the number 150.3 has four significant figures.

One centimeter is equal to 10 millimeters.

Gas is the state of matter with particles that have the highest amount of kinetic energy. In a gas, the particles are not held together tightly and are free to move around rapidly. This high kinetic energy results in the particles colliding frequently and with great force. As a result, gases can expand to fill the container they are placed in and have no fixed shape or volume. The other two states of matter, solid and liquid, have particles with lower kinetic energy and are more closely packed together.

Hydrogen peroxide, with the chemical formula H2O2, is classified as a compound. A compound is a substance that is composed of two or more different elements chemically bonded together. In the case of hydrogen peroxide, it consists of hydrogen and oxygen atoms bonded together in a specific ratio. This ratio is fixed, meaning that hydrogen peroxide will always have two hydrogen atoms and two oxygen atoms. Therefore, hydrogen peroxide fits the definition of a compound.

Solids have the lowest amount of kinetic energy compared to liquids and gases. In solids, the particles are tightly packed and have strong intermolecular forces, which restrict their movement. As a result, the particles in a solid can only vibrate in place, without being able to move freely like in liquids or gases. This lack of movement gives solids their characteristic rigidity and shape.

There are 1000 millimeters in a meter. Therefore, to convert millimeters to meters, we divide the number of millimeters by 1000. In this case, 1600 mm divided by 1000 equals 1.6 meters.

Malleability is an intensive physical property because it is a characteristic that does not depend on the amount of substance present. It is a property that describes the behavior of a material at the microscopic level, specifically its ability to be deformed under pressure without breaking. The fact that malleability is not dependent on the quantity of the material makes it an intensive property.

When rounding a number to a certain number of significant figures, we look at the digit immediately to the right of the desired significant figure. If this digit is 5 or greater, we round up. If it is less than 5, we round down. In this case, the digit immediately to the right of the third significant figure (2) is 5, so we round up. Therefore, the correct answer is 0.0254.

Boiling points and melting points are examples of intensive physical properties. Intensive physical properties do not depend on the amount of substance present and remain constant regardless of the quantity. In contrast, extensive physical properties, such as mass or volume, vary with the amount of substance. Since boiling points and melting points are characteristic properties of substances and do not change with the quantity, they are considered intensive physical properties.

Gas is easily compressed because its particles are far apart and move freely. In a gas, the particles have high kinetic energy and are not held together tightly. This allows the gas to be easily compressed into a smaller volume by applying pressure. In contrast, solids and liquids have particles that are closely packed and have stronger intermolecular forces, making them more difficult to compress.

The correct answer is 20,000 mg Na. To convert from kg to mg, we multiply by 1,000,000. So, 0.02 kg is equal to 20,000 mg.

The document that must be on file for all of our chemicals is the MSDS (Material Safety Data Sheet). Without this document, we are unable to use the chemical. The MSDS provides important information about the potential hazards, safe handling procedures, and emergency response measures for each chemical. It is crucial to have this information readily available to ensure the safety of our employees and the proper handling of the chemicals.