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3 years ago

Regarding chemical elements such as argon that are inert, which of the following statements is true?

Chemistry

1 answer:

QveST [7]3 years ago

4 0

Answer:

C. They don't react with other elements to form compounds

Explanation:

The elements in Group 18 of the periodic table are called "inert", or noble gases.

These elements have their valence shell (the outermost shell of the atom) full of electrons, so they do not gain/give off electrons, and therefore, they do not react with other elements, so they do not form compounds.

In fact, normally the elements try to gain/give off electrons in order to fullfill their outermost shell (the valence shell). For instance, an atom that has 1 electron only in its valence shell, try to "give away" this electron in order to have its outermost shell completed. On the other hand, an atom which has 7 electrons in its valence shell tries to "gain" one electron in order to fullfill the valence shell.

Noble gases, instead, have already 8 electrons in their valence shell, so their valence shell is already completed, therefore they do not react with other elements, and therefore they are called "inert".

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Which would be the best tools to measure the density of a small piece of silver ore?

Marina CMI [18]

So, let's go trough all the options:

A can't be the answer because a barometer is an instrument to measure atmospheric pressure, not density.

B seems like the answer but it's not. A density probe is used to measure density, temperature and level of fuel in the car, and not density of an object.

C is the answer, but it doesn't give you the answer directly. *

* We know that the formula of density is:

$\bf~Density = \frac{Mass}{Volume}$

→ By putting the piece of ore inside the graduated cylinder with water, we can measure the ore's volume and by putting it on a balance, we can measure its mass and that is all we need to find it's density.

Hope it helped,

BioTeacher101

(If you have any questions, feel free to ask them in the comments)

3 0

3 years ago

Which statement is true?

777dan777 [17]

D is the answer.......

5 0

3 years ago

Which equation best represents the balanced net ionic equation for the reaction that occurs when aqueous solutions of lithium ph

forsale [732]

Answer:

2 PO₄³⁻(aq) + 3 Mg²⁺(aq) ⇒ Mg₃(PO₄)₂(s)

Explanation:

Let's consider the molecular equation that occurs when aqueous solutions of lithium phosphate and magnesium nitrate are mixed.

2 Li₃PO₄(aq) + 3 Mg(NO₃)₂(aq) ⇒ 6 LiNO₃(aq) + Mg₃(PO₄)₂(s)

The complete ionic equation includes all the ions and insoluble species.

6 Li⁺(aq) + 2 PO₄³⁻(aq) + 3 Mg²⁺(aq) + 6 NO₃⁻(aq) ⇒ 6 Li⁺(aq) + 6 NO₃⁻(aq) + Mg₃(PO₄)₂(s)

The net ionic equation includes only the ions that participate in the reaction and insoluble species.

2 PO₄³⁻(aq) + 3 Mg²⁺(aq) ⇒ Mg₃(PO₄)₂(s)

8 0

3 years ago

What is the molality of a solution containing 2.6 moles of sugar and 6 kg water?

Pachacha [2.7K]

Convert kg into L, then take the moles and divide it by the L of water

8 0

3 years ago

Read 2 more answers

What is the importance of dissolved co2 and o2 in water

hodyreva [135]

Answer:

The oxygen O2, and the carbon dioxide (CO2) dissolved in water are very important to keep live in aquatic bodies.

Explanation:

Oxygen (O2) is an element found in nature usually as a gas in the air that we breathe. Oxygen is very important for aerobic organisms, including us, the humans. It can dissolve in water, and it is vital for the health of aquatic habitats. If we have low quantity of oxygen dissolve in water means that could be a pollution problem. Actually the oxygen level is an indicator to determine the water quality. In order to survive the aquatic biota (animals and plants) need certain quantity of oxygen. The oxygen dissolved in the water comes from the air, because of the wind, rain, waves, currents, and from aquatic plants like algae thanks to a process call photosynthesis.

Carbon Dioxide (CO2) is a chemical compound. This gas also is found in the air, and can be dissolved in water easier than oxygen. Aquatic plants needs CO2, to produce their own food during the photosynthesis process. It´s very important to have enough CO2, for the growth of aquatic plants. But if we have to much CO2 the fish will not have enough oxygen and could suffocate and die. Aquatic animals through respiration process produce CO2, it also can be obtained from fermentation, and from the burning of any substance that has carbon C.

If we want to preserve live in the aquatic bodies we must keep the balance between oxygen and carbon dioxide.

4 0

3 years ago