Please someone help me!

What does nuclear fission mean?

vampirchik [111]

A nuclear reactionIt’s like another particle with the release of energy

5 0

3 years ago

Value of MA is always lesser thàn 1 why?

Degger [83]

Answer:

because the load arm is greater than the effort arm. As we know that when the load arm is greater than the effort arm, the mechanical advantage will always be lesser than one, which results in gain in speed

3 0

3 years ago

A student mixes 40. Ml of 0. 10mhbr(aq) with 60. Ml of 0. 10mkoh(aq) at 25°c. What is the [oh−] of the resulting solution?

diamong [38]

After the complete neutralization reaction occurs, excess hydroxide ion is left unreacted the hydroxide ion of the resulting solution, [OH-] is 0.02 M.

<h3>What is the concentration of the hydroxide ion, [OH-]?</h3>

The hydroxide ion concentration is the amount in moles of hydroxide ion in a solution.

The hydroxide ion concentration is written as [OH-].

The equation of the reaction is given below:

1 mole of HBr reacts with 1 mole of KOH

Moles of HBr = 40 mL × 0.1 M = 4 mm moles

Moles of KOH = 60 mL × 0.1 M = 6 m moles

Moles of [OH-] = 6 - 4 = 2 m moles

Volume of solution = 100 mL

$[OH-] = \dfrac{2m\; moles}{100\; mL} = 0.02 M$

Thus, the concentration of the hydroxide ion, [OH-] is 0.02 M.

Learn more about hydroxide ion

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3 0

2 years ago

How fast should you heat the melting point sample?

hichkok12 [17]

Answer:

Option a.

Explanation:

The transformation of a solid into liquid is a slow process, hence a rate of heating too fast, near the melting point of the sample, will not give the right time to the crystals of the sample to absorb the heat and to melt in the outside and the inside, leading to wrong results in all cases. If we heat to fast, the melting point range will be too broad and will be misleading, resulting in values of the range more hight than the theoric ones.

A rate of 1 °C/min or 2 °C/min is the most appropriate to approach the melting point of the sample. Since it is too slow, from preventing the experiment taking forever it is recommended to start the experiment at a high heating rate until it reaches 20 °C below the melting point, and then, turn the heating rate down to 1 °C/min or 2 °C/min.

Therefore, the correct answer is a: near the melting point of the sample, we must heat slowly until it reach the expected temperature.

I hope it helps you!

7 0

3 years ago

This is my first question on Brainly, Can someone explain Molar mass to me? I am not very good with it..

suter [353]

Hey,
A mole is a unit of measure that helps us compare particles of any given substance and its mass. ... The molar mass, also known as molecular weight, is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule. The unit used to measure is grams per mole.

5 0

4 years ago