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soldi70 [24.7K]

2 years ago

11

Please please please someone give me the answers to all of these our teacher is very bad at explaining things and we are all con

fused i really need the answers please

1 answer:

Xelga [282]2 years ago

6 0

Answer: #1 2Al + 2S - Al2S2

Explanation: You have to make sure there are 2 of each on each side

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A nearly complete skeleton, ____ is a classic example of a Neanderthal with many defining Neanderthal characteristics. Group of

Ostrovityanka [42]

Answer: La Ferrassie 1

Explanation: La Ferrassie 1, often referred to as LF1, is a male Neanderthal skeleton estimated to be 70–50,000 years old. It was discovered at the La Ferrassie site in France by Louis Capitan and Denis Peyrony in 1909. The skull is the most complete Neanderthal skull ever found.

4 0

2 years ago

(2pts) During the Purification of Lactate Dehydrogenase (LDH) experiment, you will need 50ml of buffer A150. Buffer A150 is 30mM

torisob [31]

Answer:

The answer is " $20 \ mL$ "

Explanation:

Given:

Molarity= number of moles

because it is 1 Liter

$\to \frac{0.03\ moles}{1.5 moles}=0.02\ L= 20 \ mL \ of\ Tris\\\\$

therefore,

it takes 20 mL of Tris.

$\to \frac{0.150 \ moles}{5\ moles} =0.03\ L\\\\$

$= 30 \ mL \ of\ Nacl$

So, take $20 \ mL\ of\ NaCl.$

6 0

3 years ago

The table compares the number of electrons in two unknown neutral atoms. Use this information to determine the number of Valence

AnnZ [28]

Answer:

for example, a carbon atom weighs less than 2 × 10−23 g, and an electron .... Determine the numbers of protons, neutrons, and electrons in one of these iodine anions. ... We use the same symbol to indicate one atom of mercury (microscopic ... All known elements and their symbols are in the periodic table

Explanation:

4 0

3 years ago

What is the [H+] if the pH of a

jeyben [28]

<h3>Solution:</h3>

$[\text{H}^{+}] = 10^{-\text{pH}}$

$[\text{H}^{+}] = 10^{-1.65}$

$\boxed{[\text{H}^{+}] = 2.2 × 10^{-2} \: M}$

#ILoveChemistry

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3 0

3 years ago

If you want to determine the actual salicylate concentration for a sample that gives a greater absorption than the highest conce

Anarel [89]

Answer: The concentration of unknown sample is 1.8 mg/ml

Explanation:

According to the dilution law,

$M_1V_1=M_2V_2$

where,

$M_1$ = concentration of stock solution = ?

$V_1$ = volume of stock solution = 0.25 ml

$M_1$ = concentration of diluted solution = 0.45 mg/ml

$V_1$ = volume of diluted solution = (0.25+0.75) ml = 1.00 ml

Putting in the values we get:

$M_1\times 0.25=0.45\times 1.00$

$M_1=1.8mg/ml$

Therefore, concentration of unknown sample is 1.8 mg/ml

3 0

2 years ago