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Using the process of elimination and understanding:

Pteridophytes (ferns) and the group of spore-dispersing vascular plants.

Explanation:

mg2+ would be the smaller ion this is because each ion has the same number of electrons however mg2+ has a greater number of protons and therefore is more charge dense and the outer electrons feel a greater pull from the nucleus.

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Answer: Density, Volume, Shape

Answer:Calcium bicarbonate, also called calcium hydrogen carbonate, has the chemical formula Ca(HCO3)2. The term does not refer to a known solid compound;

calcium bicarbonate = calcium carbonate + water + carbon dioxide

Explanation:

Answer:  extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution

Explanation:

Across the world, amphibians have been disappearing at an unprecedented rate — faster than any other group of animals. Frogs, toads, and salamanders are extremely sensitive to environmental changes caused by habitat destruction, climate change, pollution, and invasive species.

Answer: An overturned decomposing log or the underside of a rock in a stream are excellent examples of microhabitats. Both a habitat and a microhabitat have typical abiotic (e.g. water, temperature, light.

Explanation:

Answer:

Are you spraking Vietnamese?

If a chemical equation is not balanced it implies that either mass has been created or destroyed which is a contradiction to law of conversation of mass which states that matter can niether be created nor destroyed.

In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.

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Explanation:

mole = mass/molar mass

mole of Nacl = mass/mm

molar mass of Nacl = Na + Cl = 23+35=58

mole of NaCl = 29/58

mole of NaCl = 0.5mol

H2SO4 + NaCl ====> HCl + Na2SO4

1. 1. 1. 1

since mole of NaCl is 0.2mol then mole of HCl is also 0.2mol since they are all in the same ratio

mole of HCl = Mole of NaCl = 0.5mol

mass of HCl = ?

molar mass of HCl = H + Cl = 1+ 35=36

mole of HCl = mass /molar mass

0.5= mass/36

mass = 0.5×36 = 18 grams

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Positive and negative ions attract each other and combine with each other to yield ionic compounds and they are separated easily to conduct electricity.

Answer:

multiply 7x.3048m and it =s 2.134 meters

CH  

3

​

CH  

2

​

OCH  

3

​

 and CH  

3

​

CH  

2

​

CH  

2

​

OH have different functional groups, hence, they are functional isomers.

Let required moles be x

[tex]\\ \sf\longmapsto \dfrac{2}{6}=\dfrac{x}{75}[/tex]

[tex]\\ \sf\longmapsto \dfrac{1}{3}=\dfrac{x}{75}[/tex]

[tex]\\ \sf\longmapsto x=\dfrac{75}{3}[/tex]

[tex]\\ \sf\longmapsto x=25mol[/tex]

2moles of H2O are made when 6moles of HNO3 are consumed

75 mole of HNO3 produces = [tex]\frac{2}{6}[/tex]× 75 ⇒ 25 moles of water

The limiting reagent is the reactant that is completely used up in a reaction and thus determines when the reaction stops.

S + 6 HNO3 --> H2SO4 + 6 NO2 + 2 H2O

6 mole of HNO3 produces = 2 moles of H₂O

1 mole of HNO3 produces = [tex]\frac{2}{6}[/tex] mole of H₂O

∴ 75 mole of HNO3 produces = [tex]\frac{2}{6}[/tex]× 75 ⇒ 25 moles of water

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Answer: 20

Explanation: For example, all calcium atoms have an atomic number of 20 but there are three isotopes of calcium - 39, 40, and 42.

Answer:

your answer is 769

Explanation:

i took the test lol

The pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature, according to Gay Lussac's Law. When you heat a gas, the molecules gain energy and move faster. This means more impacts on the container's walls and an increase in pressure.

The temperature  at 565 torr = 276.5 K  

The temperature = [tex]\frac{565 X 318.15}{650}[/tex] =276.5 K  

To learn more about : Gas laws

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Answer:

The emission spectrum of a chemical element or chemical compound is the spectrum of frequencies of electromagnetic radiation emitted due to an atom or molecule making a transition from a high energy state to a lower energy state. ...  

Explanation:

Therefore, spectroscopy can be used to identify elements in matter of unknown composition.

Answer:

A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 (six protons plus six neutrons).

Carbon-13 (13C) is a natural, stable isotope of carbon with a nucleus containing six protons and seven neutrons and six electrons.

Neutral carbon-14 contains six protons, eight neutrons, and six electrons; its mass number is 14 (six protons plus eight neutrons).

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The number of electrons, protons and neutrons in carbon -12 are all 6 and in carbon-13 they are 6, 6, and 7 respectively and in carbon-14 it is 6, 6,and 8 .

Isotopes are atoms of same element with different mass numbers. Isotopes slightly differ in physical and chemical properties also. Most of the element in periodic table have isotopes however, not all of them are stable and abundant.

The number electrons and protons in a neutral atom is equal. Mass number of an atom is the sum of number of protons and neutrons. In carbon -12, the number of electrons and protons and neutrons is 6 and the number of neutrons in carbon -13 is 7.

The number of electrons and protons is 6 and that of carbon- 14 is 7. Therefore, all these isotopes are having same atomic number but differ in neutrons numbers.

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Answer:

Florida is tied for first place as having the fewest earthquakes of any US state. Because Florida is not located near any tectonic plate boundaries like california.

Explanation:

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B.)because they are packet tight

Answer:

Because they are packet tight.

Explanation:

Solids maintain their volume and shape because they are packet tight.

Answer:

Its formula is B) XY3,also known as ammonia,because X is hydrogen and Y is nitrogen.

So,yeah the answer is B

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The electronic structures of atoms X and Y are shown. X and Y form a covalent compound. The formula is XY₃. The correct option is B.

Covalent bonds are the strongest bonds present between chemical elements. This bond is formed by sharing electrons between the elements.

Two atoms share electrons with each other and form bonds between them. They are the strongest because there is sharing of electrons between them.

There are five electrons present in the outer shell of the Y atom. There are two atoms more needed to complete the orbital of Y. There is one electron present in the X atom.

Those compounds that are formed by the covalent bond are the strongest compounds. So they are not easy to break them.

Thus, the correct option is B. XY₃.

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Answer:

Mitochondrion

Explanation:

Joe's cells can't convert food energy effectively into energy they can

use. As a result, he gets extremely tired, has weak legs, and can't

breathe well. Joe swims every day to keep his body as strong as

possible. Which organelle is affected by Joes disease

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Answer:

Around 129 galons

Explanation:

if you divied 3,241 by 4 you get 129 gallons but if you times that by 25 you get 3,225 so a little bit off but close.

Explanation:

In general, catalytic action is a chemical reaction between the catalyst and a reactant, forming chemical intermediates that are able to react more readily with each other or with another reactant, to form the desired end product.

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Answer:

titanium (I) chloride

Explanation:

Tin has a chemical formular of "Sn"

[tex].[/tex]

Answer:

Carbon is the only element that can form so many different compounds because each carbon atom can form four chemical bonds to other atoms, and because the carbon atom is just the right, small size to fit in comfortably as parts of very large molecules.

Answer:

Scientists describe any substance that shatters or breaks easily as being brittle.  

Explanation:

Brainliest?

Answer:

The number of protons in the nucleus of an atom is the atomic number of that element. Because atoms are electrically neutral, the number of protons and electrons in an atom are equal. The sum of the protons and neutrons is the mass number.

Carbon is classified as a nonmetal.

Answer:

All I know is these things hope they help u.