CHEMISTRY HIGH SCHOOL

Which one has the less density?

Answers

Answer 1

Answer:

Answer:

Large mass but not as much volume, so not as dense...

Explanation:

Answer 2

Answer:

Answer:

Explanation:

You take the mass/volume to find density.

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Select the THREE answers that are correct concerning a saturated solution of PbCl2. PbCl2(s) Pb+2(aq) + 2Cl-(aq)

Answers

Answer:

a b d

Explanation:

Which group of nuclear emissions is listed in order of increasing charge?(1) alpha particle, beta particle, gamma radiation
(2) gamma radiation, alpha particle, beta particle
(3) positron, alpha particle, neutron
(4) neutron, positron, alpha particle

Answers

Answer: Option (4) is the correct answer.

Explanation:

An alpha particle is basically a helium nucleus and it contains 2 protons and 2 neutrons. Symbol of an alpha particle is $^(4)_(2)\alpha$ or $^(4)_(2)He$ .

This means that an alpha particle carries a +2 charge.

A positron is a small particle which contains a +1 charge. And, a positron is represent by the symbol $^(0)_(+1)\beta$ .

A neutron is a sub-atomic particle present inside the nucleus of an atom. Charge on a neutron is 0.

A gamma particle is basically a photon of electromagnetic radiation with a short wavelength.

Symbol of a gamma particle is $^(0)_(0)\gamma$ . Hence, charge on a gamma particle is also 0.

Therefore, we can conclude that group of nuclear emissions from neutron, positron, alpha particle is listed in order of increasing charge.

The group of nuclear emissions is listed in order of increasing charge is neutron, positron and alpha particle and the correct option is option 4.

Nuclear emissions refer to the particles and radiation that are emitted from the nucleus of an atom during a nuclear reaction or radioactive decay. These emissions include alpha particles, beta particles, gamma radiation, positrons, and neutrons.

Alpha particles (α): These are helium nuclei consisting of two protons and two neutrons. They have a positive charge and relatively low penetrating power.
Beta particles (β): These are high-energy electrons (β-) or positrons (β+) emitted during radioactive decay. Beta particles have a negative charge (β-) or positive charge (β+) and moderate penetrating power.
Gamma radiation (γ): This is electromagnetic radiation of high energy and frequency. Gamma radiation has no charge and is highly penetrating.
Positrons: Positrons are positively charged particles with the same mass as an electron but opposite charge. They are emitted during certain types of radioactive decay.
Neutrons: Neutrons are electrically neutral particles found in the nucleus of an atom. They have no charge and are emitted during nuclear reactions or as a result of radioactive decay.

Thus, the ideal selection is option 4.

Learn more about Nuclear emissions, here:

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Which of the following is one way to prevent the corrosion of iron

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D) its the easiest and most effective.

How is the periodic table constructed ?

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Before the periodic table, there were a bunch of symbols, number, letters etc (In all kinds of languages) that represented the elements. Scientists around the world saw that a chart of the elements needed to be universally accepted and finalized. A guy named Mendeleev presented this idea to the scientific community. Mendeleev was also the first to order elements according to atomic number rather than atomic weight. The modern day periodic table was not published by him, it was developed with the help of the entire scientific community. Honestly, there isn't a specific way to tell you how the periodic table was constructed, scientists developed thousands of tables that represented the elements. And just to let you know, the modern day periodic table is constantly going through changes as we discover more and more about elements, atoms, molecules etc. so in the near future it wouldn't be surprising if we saw something completely different than what we see today.

The Periodic Table is in order of electrons, and the columns are set up to show the amount of electrons in the outer most orbit.

Which substances are present in the net ionic equation for the reaction that would occur when MgCl2 (aq) is combined with H3PO4(aq) ? [Select all that apply.] A H+(aq) B Cl2−(aq) C Mg2+(aq) D Mg+(aq) E Mg3PO4( s) F Mg3(PO4)2(s) G Mg(aq) Cr (aq) H HCl(aq) MgPO4 (s) I Mg2(PO4)3 (s) J H3PO4(aq)

Answers

Answer:the correct options are A (H⁺(aq)) and E (Mg₃(PO₄)₂(s)).

Explanation:To determine which substances are present in the net ionic equation for the reaction between MgCl2(aq) and H3PO4(aq), we first need to write the balanced molecular equation and then separate it into ions to identify the spectator ions. Spectator ions are those ions that do not participate in the chemical reaction and remain unchanged.

First, let's write the balanced molecular equation:

MgCl2(aq) + 2H3PO4(aq) -> Mg3(PO4)2(s) + 6HCl(aq)

Now, let's break down the equation into ions:

Mg²⁺(aq) + 2Cl⁻(aq) + 2H₃PO₄(aq) -> Mg₃(PO₄)₂(s) + 6H⁺(aq) + 6Cl⁻(aq)

Now, let's identify the spectator ions, which are the ions that appear on both sides of the equation and do not change:

- Mg²⁺(aq) is present on both sides.

- Cl⁻(aq) is present on both sides.

So, the spectator ions are Mg²⁺(aq) and Cl⁻(aq).

Now, let's determine the substances that are part of the net ionic equation, excluding the spectator ions:

Net Ionic Equation: 2H₃PO₄(aq) -> Mg₃(PO₄)₂(s) + 6H⁺(aq)

From the net ionic equation, the following substances are present:

A. H⁺(aq)