Chemistry 1st 6 Weeks Exam

Which of the following first aid measures would be needed to prevent the danger from occurring?

• Covering exposed skin with aprons and gloves
• Wearing flip flops or sandals in lab
• Running water over the skin for 15 minutes
• Spreading sand on the lab tables and the floor

A student is worried about determining if a chemical is radioactive. Which section of the SDS would the student refer to?

• Product Information
• Fire Fighting Methods
• Physical and Chemical Properties
• Hazards Identification

Which chemical is the most reactive and dangerous to handle and why?

• Chemical A because it is an acid and the rating of 2 is the most dangerous rating.
• Chemical B because it has unusual reactions with water and the lowest ratings.
• Chemical C because it is an alkaline material and the highest ratings around 4.
• All of the chemicals are very reactive and dangerous to handle.

Using the SDS, which of the following statements justifies the use of a designated waste container?

• The state of Texas requires sodium hydroxide to be disposed of in a designated container.
• The SDS states that sodium hydroxide should be disposed of in a container.
• The SDS does not allow sodium hydroxide to be flushed or thrown in the trash.
• Using a designated waste container avoids releasing sodium hydroxide into the environment.

Industrial recycling plants sort a wide range of materials by their volume, weight, size, and melting point. Machines are able to complete this process quickly so large amounts of material can be divided and sorted. Of the properties listed below, which is an intensive property that would be most useful to sort the material by?

• Color
• Volume
• Weight
• Density

Students conduct a lab that requires them to use approximately 0.5 grams of a nickel compound. One student takes too much of the compound and has some left over. Which of the following is the correct procedure for handling the leftover compound?

• Pour the leftover compound into the sink.
• Dispose of the leftover compound in the normal trash.
• Ask the teacher how to dispose of any leftover compound.
• Place all the leftover compound back in its original container.

Which of the following best shows that the investigation results in a chemical change?

• Liquid condenses on a cold glass rod when gas from the test tube on the left is released.
• A gas probe indicates that the water in the beaker contains dissolved nitrogen and oxygen.
• A burning wood splint placed above the mouth of the test tube on the right glows brighter when some gas is released from the test tube.
• The temperature of the wire connected to the battery increases.

Students place weights on the syringe's plunger and record its position. Which of the following is the dependent variable in this experiment?

• Amount of Gas
• Temperature of the Gas
• Pressure of the gas
• Volume of the Gas

What is the mass of the beaker?

• 53.6 g
• 253.6 g
• 536 g
• 2,536 g

Which of the following is the best estimate of the volume poured from the graduated cylinder?

• 3 mL
• 3.6 mL
• 4.4 mL
• 4.6 mL