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7 days ago

Enter the numbers 1 to 5 to put in order the steps for lighting a Bunsen burner.

2 answers:

9 0

To light a Bunsen burner, you should follow these essential steps: First, tidy up the surrounding area and remove any combustible items. Second, shut off the air supply. Third, activate the gas flow to the burner. Fourth, ignite the flame using a lighter. Finally, modify the air intake to regulate the size of the flame.

Tems11 [839]7 days ago

7 0

Answer:

The precise sequence for lighting a Bunsen burner is as follows:

1. Remove all flammable objects such as liquids and hair from the vicinity.

2. Ignite the flame using a strike lighter.

3. Activate the gas flow to the Bunsen burner.

4. Adjust the air flow to achieve the desired flame size.

5. Finally, seal the air supply on the Bunsen burner.

Explanation:

It’s crucial to emphasize that safety procedures must be observed when operating a Bunsen burner to protect the user and the laboratory. Therefore, the steps must be performed in the prescribed order:

1. First, ensure that all flammable materials around the burner are cleared to prevent a fire from igniting once the burner is lit. It's vital to complete this step beforehand rather than after lighting.

2. and 3. The lighter should be lit before turning on the gas. Activating the gas beforehand could lead to dangerous gas accumulation around the burner, potentially causing an explosion when the lighter is ignited. Thus, the lighter is first ignited, followed by a careful and gradual activation of the gas supply to light the burner.

4. Afterwards, adjust airflow gradually to achieve an optimal flame size. When a blue flame appears, adjustments should cease.

5. Once finished using the burner, the air supply must be securely closed off to prevent gas leaks.

Additionally, ensure that the gas cylinder is not located in the same room as the burner and that a fire extinguisher is on hand in case of emergencies.

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In order to use a pipet, place a ____________ at the top of the pipet. Use this object to fill the pipet such that the _________

Tems11 [839]

Answer:

The right responses are "bulb or pump; meniscus; outside".

Explanation:

Pipets are essential tools in laboratory settings. They are designed for transferring liquids from one vessel to another. First, a bulb or pump is attached to the top to empty the pipet completely. Next, fill the pipet until the meniscus (the curved top of the liquid) aligns with the measurement line corresponding to the volume needed. Finally, dispense the liquid into a second container and make sure to eliminate the last drop beyond the pipet tip.

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8 days ago

A crystallographer measures the horizontal spacing between molecules in a crystal. The spacing is

castortr0y [918]

Answer: The overall width of a crystal measures 1.65 mm.

Explanation:

Horizontal distance separating the two molecules is 16.5 nm.

Width of the $10^5$ molecules: $16.5 nm\times 10^5=16.5\times 10^5 nm$

$1 nm=10^{-6} mm$

The overall width of a crystal measured in millimeters= $16.5\times 10^5\times 10^{-6} mm=1.65 mm$

The overall width of a crystal is 1.65 mm.

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11 days ago

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What volume of 0.550 M KBr solution can you make from 100.0 mL of 2.50 M KBr?

castortr0y [918]

M1V1 = M2V2
(2.50)(100.0) = (0.550)V2
V2 = 455mL

From 100.0 mL of 2.50 M KBr, you can prepare 455 mL of 0.550 M solution.

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14 days ago

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You have a racemic mixture of d-2-butanol and l-2-butanol. the d isomer rotates polarized light by +13.5∘. what is the rotation

Anarel [845]

The L- isomer serves as the enantiomer of the D- isomer, and given that the optical rotation of the D- isomer is + 13.5°, the L- isomer's optical rotation will have the same magnitude but an opposite sign, resulting in -13.5°.

Thus, the rotation of the racemic mixture will be equal to 0°.

- This occurs because a racemic mixture contains equal proportions of both enantiomers.

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1 day ago

The researcher performed a follow-up experiment to measure the rate of oxygen consumption by muscle and brain cells. Predict the

Alekssandra [962]

Answer:

Mitochondria are plentiful in mammalian cells, with their proportions varying across different tissues, from less than 1% in white blood cells to as high as 35% in heart muscle cells. It is essential to understand that mitochondria are not static structures but instead form a dynamic network that frequently undergoes processes of fission and fusion. In skeletal muscle, they exist as part of a reticular membrane network. The two subpopulations, subsarcolemmal (SS) and intermyofibrillar (IMF) mitochondria, occupy different subcellular regions and exhibit slight differences in their biochemical and functional characteristics tied to their anatomical context. The SS mitochondria are positioned just beneath the sarcolemma, while IMF mitochondria are found closely associated with myofibrils. Their distinct properties likely play a role in their adaptability. SS mitochondria make up about 10-15% of the total mitochondrial volume and are believed to be more adaptable than their IMF counterparts, despite the latter displaying higher levels of protein synthesis, enzyme activity, and respiration (1).

Explanation:

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16 days ago

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