Which type of clouds are tall and very dark on the bottom;usually gray black

The ksp of pbbr2 is 6.60× 10–6. what is the molar solubility of pbbr2 in 0.500 m kbr solution

Alex_Xolod [135]

The solubility of PbBr₂(s) with the presence of 0.500 M of KBr is 2.64 x 10⁻⁵ M.

4 0

3 years ago

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what ph indicator is added to the simmons citrate agar? group of answer choices phenol red methylene green bromothymol blue litm

NikAS [45]

The most common pH indicator used in Simmons Citrate Agar is Bromthymol Blue (BTB)

Simmons Citrate Agar is a selective and differential medium used for the detection and differentiation of Enterobacteriaceae (gram-negative bacteria).

The medium contains sodium citrate as the sole carbon source, which is used to differentiate organisms based on their ability to utilize citrate as a sole carbon source.

The medium also contains pH indicators that change color based on the pH of the medium. The most common pH indicator used in Simmons Citrate Agar is Bromthymol Blue (BTB).

BTB is a pH indicator that turns yellow in acidic conditions and blue in basic conditions. As the bacteria metabolize the citrate in the medium, they produce acids, which cause the medium to become acidic.

This change in pH is detected by the BTB, which changes color from blue to yellow. The yellow coloration of the medium is an indication that the organism is utilizing citrate as a sole carbon source.

To know more about agar, click below:

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7 0

1 year ago

A chemist has three different acid solutions. The first acid solution contains 20 % acid, the second contains 35 % and the third

QveST [7]

Answer:

5 L , 10 L and 30 L of each solution should be used respectively.

Explanation:

Volume of solution-1 = x

Volume of solution-2 = y

Volume of solution-3 = z

Total volume of an acid solution desired = 45 L

x + y + z = 45 L

Percentage of an acid in solution-1 = 20%

Volume of an acid in solution-1 = 20% of x = 0.2x

Percentage of an acid in solution-2 = 35%

Volume of an acid in solution-2 = 35% of y = 0.35y

Percentage of an acid in solution-3 = 75%

Volume of an acid in solution-3 = 75% of z = 0.75z

Percentage of an acid solution desired = 60%

Volume of an acid in desired solution = $\frac{60}{100}\times 45 L=27L$

Sum of volume of acids in all three solution will be equal to 27 L.

0.2x + 0.35y + 0.75z = 27 L

Also give that, chemist want prepare solution by using 3 times as much of the 75 % solution as the 35 % solution.

3y = z

x + y + z = 45 L

x + 4y = 45 L..[1]

0.2x + 0.35y + 0.75z = 27 L

0.2x + 0.35y + 0.75(3y) = 27 L

0.2x + 2.6y= 27 L...[2]

On solving [1] and [2] ,we get:

x = 5 L

y = 10 L

z = 3y = 30 L

5 L , 10 L and 30 L liters of each solution should be used respectively.

3 0

3 years ago

Hydrogen fusion creates _____ and lots of energy.

seraphim [82]

Explanation:

Fusion processes require fuel and a confined environment with sufficient temperature, pressure, and confinement time to create a plasma in which fusion can occur. The combination of these figures that results in a power-producing system is known as the Lawson criterion. In stars, the most common fuel is hydrogen, and gravity provides extremely long confinement times that reach the conditions needed for fusion energy production. Proposed fusion reactors generally use hydrogen isotopes such as deuterium and tritium (and especially a mixture of the two), which react more easily than hydrogen to allow them to reach the Lawson criterion requirements with less extreme conditions. Most designs aim to heat their fuel to around 100 million degrees, which presents a major challenge in producing a successful design.

As a source of power, nuclear fusion is expected to have many advantages over fission. These include reduced radioactivity in operation and little high-level nuclear waste, ample fuel supplies, and increased safety. However, the necessary combination of temperature, pressure, and duration has proven to be difficult to produce in a practical and economical manner. Research into fusion reactors began in the 1940s, but to date, no design has produced more fusion power output than the electrical power input.[1] A second issue that affects common reactions is managing neutrons that are released during the reaction, which over time degrade many common materials used within the reaction chamber.

Fusion researchers have investigated various confinement concepts. The early emphasis was on three main systems: z-pinch, stellarator, and magnetic mirror. The current leading designs are the tokamak and inertial confinement (ICF) by laser. Both designs are under research at very large scales, most notably the ITER tokamak in

7 0

3 years ago

In the reaction of magnesium with oxygen, explain which atom is the reducing agent.

Mnenie [13.5K]

Answer:

Mg.

Explanation:

The oxidation-reduction reaction contains a reductant and an oxidant (oxidizing agent).

An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced.

A reducing agent (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction.

For the reaction:

Mg is oxidized to Mg²⁺ in (MgO) (loses 2 electrons). "reducing agent".

O is reduced to O²⁻ in (MgO) (gains 2 electrons). "oxidizing agent".

5 0

3 years ago