In a college there are exactly 3000 students, exactly 60% are male. What is the number of female students

What two particles must a substance particles exhibit in order to conduct electricity

Ghella [55]

Answer:

Proton and Electron

Explanation:

6 0

2 years ago

What is communities and what is predator-prey relationships ?

MrRissso [65]

Communities is all the populations living in an ecosystem at the same time. A predator-prey relationship is an organism that eats another organism.

8 0

3 years ago

How many molecules of water are in 1.52 moles of water?

abruzzese [7]

Answer:

9.15×10²³molecules

Explanation:

moles=number of particles/Avogadro's number

1.52=x/6.02×10²³

by cross multiplication;

x=1.52×6.02×10²³

=9.15×10²³

please like and Mark as brainliest

5 0

3 years ago

Specific amino acids that line the selectivity filter of the K channel can dehydrate K and allow passage of that ion but cannot

Bogdan [553]

Answer:

Hi

True

Explanation:

Since on the inner and outer surfaces of the membrane, a series of negatively charged amino acids are found, which increase the local concentration of cations. The path of the ions begins on the inner surface filled with water molecules where the ion can retain its hydration sphere. Two thirds of its interior in the membrane the inside of the channel narrows in the region of the selectivity filter, forcing the ion to separate from the water molecules. Oxygen atoms in the selectivity filter replace the water molecules in the K+ hydration sphere, forming a series of coordination spheres through which the ion moves. The preferential stabilization of K+ against Na+ is the basis of the ion selectivity of this filter.

5 0

2 years ago

in Analytical chemistry laboratory. Nickle(ppm)in water sample estimated by two different students was as ,student 1 (25 24 24 2

frosja888 [35]

Answer:

Answers are in the explanation

Explanation:

Precision and accuracy are both statistical concepts. Precision is about how close are the measured values to each other. Accuracy is closeness of the measured values to a specific value or reference value.

There are many ways to calculate precision and accuracy, one is stimating precision as Relative Uncertainty and accuracy as Relative Error.

Formulas are:

Relative Uncertainty: Standard desviation / Measured value.

Relative Error: Measured Value - Expected Value / Expected value

Measured value is the aveage of the values.

For student 1:

Mean = 25

Standard desviation = 1.5275

Relative Uncertainty: 1.5275 / 25

Relative Uncertainty: 0.061

Relative Error: 25 - 20 / 20

Relative Error: 0.25

For student 2:

Mean = 24.5

Standard desviation = 0.5477

Relative Uncertainty: 0.5477 / 24.5

Relative Uncertainty: 0.02

Relative Error: 24.5 - 20 / 20

Relative Error: 0.225

As the student 2 has a low Relative error and uncertainty, you can say student 2 is more accurate and precise

6 0

3 years ago