(H8) Calculations with Balanced Equations

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17 Terms

1

Analytical Balance

Mass-measuring equipment:

A common piece of equipment in the scientific laboratory.

These highly precise instruments can measure down to ten thousandths or even hundred thousandths of a gram. Modern versions use a complex system of electronic sensors to accurately mass a substance.

It is so sensitive that it often has a draft shield to prevent air currents from interfering with the measurement.

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2

Centigram Balance

Mass-measuring equipment:

It is employed in all sorts of environments including classrooms, scientific laboratories, food stores, outer space and anywhere else where the mass of something must be measured. It is a metric unit that is equal to 1/100 of a gram. The scale can measure objects to the nearest 0.01 grams. It increases efficiency in calculating the weight of an object.

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3

Platform Balance

Mass-measuring equipment:

A laboratory apparatus which is used for weighing objects. It has two platforms either mounted on or suspended from a cross-arm, and weights are placed on one platform until they balance the object being weighed.

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4

Triple Beam Balance

Mass-measuring equipment:

A type of scale that uses counterweights on three rider beams to counterbalance the sample in the pan.

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5

Beaker

Volume measuring equipment:

A cylindrical glass or plastic vessel used for holding liquids. It is a multi-purpose piece of equipment used for containing a chemical reaction, measuring liquids, heating them over a Bunsen burner's flame or collecting them in a titration experiment.

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6

Burette

Volume measuring equipment:

A cylindrical, laboratory glass apparatus that is used to measure the volume of liquids. It is very accurate and is used for precision experiments, such as titration.

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7

Distilling Flask

Volume measuring equipment:

A round bottomed container that has two openings and sometimes a long neck. It is made entirely from glass and is used for chemical distillation processes. It is also a key equipment in almost all laboratories.

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8

Dropper

Volume measuring equipment:

Also known as a chemical dropper. It is a device with a piston-driven air displacement mechanism used to transport a given volume of liquid mostly in the laboratory. They have a locking system that allows them to be very accurate in transporting and dispensing exact volumes of liquids.

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9

Erlenmeyer Flask

Volume measuring equipment:

A cone-shaped container with a neck, so you can hold the flask or attach a clamp or use a stopper. They are used to measure, mix, and store liquids. The shape makes this flask very stable. Most are made of borosilicate glass so that they can be heated over a flame or autoclaved.

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10

Florence Flask

Volume measuring equipment:

A laboratory glassware that is used to hold chemical solutions. It has a long neck with a round or flat bottom. Most of the are made of borosilicate glass, which is hard to break even when exposed to high amounts of heat.

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11

Graduated Cylinder

Volume measuring equipment:

A relatively slim glass or plastic cylinder used specifically for calibrating beakers or measuring a liquid's volume. Scientists take measurements by viewing, at eye-level, the lowest point of the convex dip that the liquid in this makes.

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12

Volumetric Flask

Volume measuring equipment:

It is characterized by having a bulb and a long neck. Most have a flattened bottom so that they can be set onto the lab bench, though some have rounded bottoms. This flask is used to prepare a solution of known concentration. It should not be used to heat substances or store solutions, and you should avoid pipetting directly from this.

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13

Pipette

Volume measuring equipment:

It transfers relatively small amounts of liquid. Experimenters draw liquid into one end of a glass or plastic cylinder by the prior squeezing of the rubber or plastic ball at the opposite end. The amount of liquid able to be drawn into this is usually fixed, to enable accuracy in measurement.

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14

Micro Pipette

Type of Pipette:

The standard laboratory equipment used to measure and transfer small volumes of liquids.

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15

Mohr Pipette

Type of Pipette:

A graduated pipet that is designed to deliver small portions of a liquid or solution. These portions are determined by recording the difference between the init and final volume readings.

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16

Serological Pipette

Type of Pipette:

This is frequently used in the laboratory for transferring milliliter volumes of liquid, from less than 1 ml to up to 50 ml. These pipettes can be sterile, plastic, and disposable or sterilizable, glass and reusable.

They use a pipet-aid, for the aspiration and dispensation of liquids.

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17

Volumetric Pipette

Type of Pipette:

It has a single graduation that allows it to deliver one specific volume accurately. It is accurate at the temperature at which it has been calibrated. The temperature where the volume is accurate is usually printed on the neck of the pipet.

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