Chem Lab

A:

The temperature of a blue flame depends on what is on fire. A burning chemical or metal may display a blue color only after reaching a particular temperature, but that threshold can vary.

See Full Answer
Filed Under:
  • Does salt affect the freezing point of water?

    Q: Does salt affect the freezing point of water?

    A:

    Salt lowers the freezing point of water. The freezing point of water is the temperature at which water transitions from liquid to solid phase. The freezing point of water is 0 degrees centigrade in ordinary conditions. However, if supercooling occurs or if the water contains impurities, the freezing point can go down.

    See Full Answer
    Filed Under:
  • What is a laboratory thermometer?

    Q: What is a laboratory thermometer?

    A:

    A laboratory thermometer is a tool used in laboratories to measure temperature with a high level of accuracy. It can be partially or fully immersed in the substance being measured. A laboratory thermometer is recognizable by its long stem with a silver bulb at the end.

    See Full Answer
    Filed Under:
  • What is the definition of test tube holder?

    Q: What is the definition of test tube holder?

    A:

    A test tube holder is an apparatus designed to support and store test tubes during a scientific experiment. A test tube is a thin-glassed tube with one closed end used in the examination of cultures such as bacteria. Test tube holders may also be referred to as test tube racks.

    See Full Answer
    Filed Under:
  • What is centrifugation?

    Q: What is centrifugation?

    A:

    Centrifugation is a process that separates solids from liquids and liquids of different densities from each other by using centrifugal force. Centrifugation is carried out inside a centrifuge.

    See Full Answer
    Filed Under:
  • What are the uses of a test tube rack?

    Q: What are the uses of a test tube rack?

    A:

    Test tube racks are commonly used in laboratories to keep test tubes upright so that the equipment does not roll away, spill or become accidentally cracked. Test tubes are delicate equipment, usually made of glass.

    See Full Answer
    Filed Under:
  • What is the function of the barrel on a Bunsen burner?

    Q: What is the function of the barrel on a Bunsen burner?

    A:

    The barrel on a Bunsen burner is the metal tube that is screwed onto the burner’s base. It contains the air intake openings that let air into the burner when uncovered and stop the entry of air when shut. The barrel is about 5 inches long.

    See Full Answer
    Filed Under:
  • What are the uses of a laboratory spatula?

    Q: What are the uses of a laboratory spatula?

    A:

    A laboratory spatula is used for mixing, spreading and holding chemicals in a laboratory. In most cases, spatulas are made of stainless steel to prevent corrosion and provide clean mixing. However, certain spatula implements are made using rubber and polymers such as nylon.

    See Full Answer
    Filed Under:
  • How do you separate nitrogen and oxygen?

    Q: How do you separate nitrogen and oxygen?

    A:

    There are several ways of separating nitrogen and oxygen. The first involves cooling the mixture down to -200 degrees Celsius and separating the gases using a process called fractional distillation. Alternatively, the gases can be cooled down to -182.95 C, the liquefaction point of oxygen. At this temperature, the oxygen in the mixture gets liquefied, while the nitrogen remains in its gaseous form, because nitrogen liquefies at -196 C.

    See Full Answer
    Filed Under:
  • What is a laboratory observation?

    Q: What is a laboratory observation?

    A:

    Laboratory observations, as used in the social sciences, bring study subjects into a laboratory setting to complete research. While the laboratory observation gives greater control over the subjects, it has the potential of introducing variables that do not exist in the real world. Laboratory observations allow researchers to gather data more efficiently than they are able to do in the natural environment.

    See Full Answer
    Filed Under:
  • What is the purpose of a microscope?

    Q: What is the purpose of a microscope?

    A:

    The microscope is a device used to view very small objects by magnifying the image. This can be done through optical and non-optical means.

    See Full Answer
    Filed Under:
  • What is the function of a test tube?

    Q: What is the function of a test tube?

    A:

    The function of a test tube is to hold, mix or heat small quantities of liquid or solid chemicals for assays and qualitative experiments. Test tubes also serve as temporary storage for chemicals to be used in chemical experiments.

    See Full Answer
    Filed Under:
  • How do you test gold at home?

    Q: How do you test gold at home?

    A:

    By American standards, fake gold is anything less than 10 karats. If you're wondering if your gold is real, the most reliable way to find out is to take it to a certified jeweler and have it tested. If you want to check for yourself, use these instructions to make that determination.

    See Full Answer
    Filed Under:
  • What is a Petri dish?

    Q: What is a Petri dish?

    A:

    A Petri dish is a shallow dish that is used to culture microorganisms. By mixing different ingredients, such as blood, salts, amino acids or bacteria, together with an agar (or medium), scientists are able to observe reactions and watch microorganisms grow and develop.

    See Full Answer
    Filed Under:
  • What is the function of a test tube holder and a test tube rack?

    Q: What is the function of a test tube holder and a test tube rack?

    A:

    A test tube holder's purpose is for holding test tubes in place, but they can also be useful for holding pipettes and stirring rods as well, and a test tube rack holds multiple test tubes in place. Some test tube racks can hold up to 40 test tubes. There are other racks designed for storing test tubes and holding even larger numbers of test tubes during a long period of time.

    See Full Answer
    Filed Under:
  • What is a thermometer used for?

    Q: What is a thermometer used for?

    A:

    A thermometer is used to measure the temperature of different materials or substances. It can be used for solids, liquids or even gases.

    See Full Answer
    Filed Under:
  • What is the definition of pH paper?

    Q: What is the definition of pH paper?

    A:

    pH paper, also called litmus paper, is filter paper that is treated with natural water soluble dye from lichens. pH paper is used as an indicator to test the acidity of water-based liquids.

    See Full Answer
    Filed Under:
  • What is the temperature of a blue flame?

    Q: What is the temperature of a blue flame?

    A:

    The temperature of a blue flame depends on what is on fire. A burning chemical or metal may display a blue color only after reaching a particular temperature, but that threshold can vary.

    See Full Answer
    Filed Under:
  • How does an electron microscope work?

    Q: How does an electron microscope work?

    A:

    Electron microscopes use high-speed electrons in a vacuum to form images of samples. Since electrons have a much smaller wavelength than light, electron microscopes have greater resolution than light microscopes.

    See Full Answer
    Filed Under:
  • What is the meaning of an investigatory project?

    Q: What is the meaning of an investigatory project?

    A:

    An investigatory project is a project that tries to find the answer to a question by using the scientific method. According to About.com, science-fair projects are usually investigatory projects.

    See Full Answer
    Filed Under:
  • How does a light microscope work?

    Q: How does a light microscope work?

    A:

    A light microscope uses a focused beam of visible light to magnify objects for observation. It works in a similar way as a refracting telescope but with several minor differences. A telescope uses a large objective lens, because it needs large amounts of light to bring a dim, distant object to a bright focus. On the other hand, a light microscope does not need a large objective lens because it only needs to acquire light from a small area of a thin, close specimen that is well illuminated.

    See Full Answer
    Filed Under:
  • What are sources of error in a chemistry lab?

    Q: What are sources of error in a chemistry lab?

    A:

    Errors in the chemistry lab can arise from human error, equipment limitations and observation errors. Some other sources of errors include measurement values that are not well defined and inconsistent experiment techniques.

    See Full Answer
    Filed Under: