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3 years ago

Pls help

Chemistry

1 answer:

Andrej [43]3 years ago

5 0

Answer:

• None of these

Explanation:

your hand looks too old.

#Rastaman

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Mitosis and meiosis are reproductive strategies not found in which Kingdom? A. Plantae B. Animalia C. Eubacteria D. Fungi

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Answer:

C. Eubacteria

Explanation:

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4 years ago

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Calcular la cantidad de NaOH necesaria para preparar medio litro de disolución 2,5 N. (Dato: peso molecular del NaOH = 40 g/mol)

kolbaska11 [484]

Answer:

The amount of NaOH required to prepare a solution of 2.5N NaOH.

The molecular mass of NaOH is 40.0g/mol.

Explanation:

Since,

NaOH has only one replaceable -OH group.

So, its acidity is one.

Hence,

The molecular mass of NaOH =its equivalent mass

Normality formula can be written as: $Normality=\frac{mass of solute NaOH}{its equivalent mass} * \frac{1}{volume of solution in L} \\$

Substitute the given values in this formula to get the mass of NaOH required.

$2.5N=\frac{mass of NaOH}{40g/mol} *\frac{1}{1L} \\mass of NaOH=2.5N*40gmol\\ = 100.0g$

Hence, the mass of NaOH required to prepare 2.5N and 1L. solution is 100g

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3 years ago

Which mineral can be easily scratched by a finger nail, has cleavage, a metallic luster and has a black streak? 11. Which two el

Kobotan [32]

Answer:

Galena

Explanation:

Galena is also known as lead glance. This is a natural mineral of the form lead(II) sulfide. It is one of the most important ore for lead. It is widely found and is mainly distributed in sulfide minerals.

Galena can be easily scratched by finger nails. It has black streak and have a metallic luster. Galena have cleavage. It usually occurs as cubic crystals.

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3 years ago

When a candle is lit and allowed to burn for 15 minutes, some wax drips and collects at the base of the candle, and the candle b

stellarik [79]

Answer:

The missing section of the candle burns away and evaporates while some drips and collects at the base.

Explanation:

This is because a chemical reaction is occurring due to the heat, causing the molecule in the candles wax to move around faster and faster therefore causing melting.

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4 years ago

Question 22 A VHF television station assigned to channel transmits its signal using radio waves with a frequency of . Calculate

aleksklad [387]

The question is incomplete, here is the complete question:

A VHF television station assigned to channel transmits its signal using radio waves with a frequency of 66.0 MHz. Calculate the wavelength of the radio waves. Round your answer to 3 significant digits.

Answer: The wavelength of the radio waves is 4.54 m

<u>Explanation:</u>

To calculate the wavelength of light, we use the equation:

$\lambda=\frac{c}{\nu}$