CHEMISTRY HIGH SCHOOL

A student dissolves some solid NaNO3 in a beaker of water. Which are the solute and the solvent? Choose all answers that are correct. A. solute: water B. solvent: water C. solvent: NaNO3 D. solute: NaNO3

Answers

Answer 1
Answer: The correct answer is D. The solute in this solution is the solid sodium nitrate (NaNO3) which is dissolved in the solvent, the water. Solute is the minor component in a solution whereas the solvent is the major component in the solution.

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One phosphorus, three chlorine, one oxygen

Answers

Phosphoryl chloride :

POCl3

hope this helps!.

Classify wine and beef stew as homogeneous or heterogeneous.

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Wine is a homogenous mixture while beef stew is a heterogeneous mixture as it has components which are clearly visible.

What are  the heterogeneous mixtures?

Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.

As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.

Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.

Learn more about heterogeneous mixtures,here:

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Wine is a homogeneous mixture. Homogeneous means same throughout. Most things with water are homogeneous. You only see the wine in this mixture.
Beef Stew is heterogeneous mixture. You can see the beef AND stew, it is different throughout. Not the same. Most heterogeneous mixtures are chunky or lumpy.

Which statement describes the particles of an ideal gas based on the kinetic molecular theory?(1) The gas particles are relatively far apart and have negligible volume.
(2) The gas particles are in constant, nonlinear motion.
(3) The gas particles have attractive forces between them.
(4) The gas particles have collisions without transferring energy.

Answers

The particles are in a constant nonlinear motion.
A. They are far apart and have negligible volume. This makes it easier to calculate certain quantities such as temperature, pressure, and volume. If the gas particle volume is added, then the complex van der Waals equation has to be used to calculate these same quantities. We also assume that they are far apart because this implies that they will not collide.

A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Which is symbol of this radionuclide?

Answers

The answer is phosphorus-32.

We know that the atom contains 15 protons, 15 electrons, and 17 neutrons.
To conclude of which element this radionuclide is, we need to know an atomic number of the element. The atomic number of the element is the number of proton in the nucleus of the atom. If the number of protons is 15, then the atomic number is 15. The element with atomic number 15 is phosphorus (according to the periodic table).
To conclude which phosphorus isotope this radionuclide is we need to know the mass number of the element. The mass number of the element is the sum of the number of protons and number of neutrons in the nucleus of the atom. If the number of protons is 15 and the number of neutrons is 17, then the mass number is 17 + 15 = 32.
Thus, this radionuclide is phosphorus-32.
Knowing that the number of protons of an element is equivalent to its atomic number, it can be determined from the periodic table of elements that this radionuclide is phosphorus. Since the number of its neutrons is 17, it can also be determined that its atomic mass is n + p = 15 + 17 = 32. This means the isotope is phosphorus-32.

The movement of organisms into a range is called A. immigration.
B. emigration.
C. population shift.
D. carrying capacity.

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The answer is A. Immigration

How many atoms are in 1.75 mol CHCL3

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1 mol = 6.022 x 10²³ atoms

In order to find how many atoms, dimly multiply the amount of moles you have by 6.022 x 10²³ or Avogadro's number.

So you have 1.75 mol CHC1₃ x (6.022x10²³) = 1.05385 x 10²⁴ atoms of CHCl₃

But now you have to round because of the rules of significant figures so you get 1.05 x 10²⁴ atoms of CHCl₃
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