helppp! ill give brainliest

The reason for adding a limited amount and then an excess amount is that initially a metal hydroxide may form which becomes soluble when more base is added and the metal complex forms.

In qualitative analysis is a common to add the base in drops and then in excess. When added in drops, the metal hydroxide is formed. This metal hydroxide is often insoluble.

After this metal hydroxide is formed, the base could be added in excess such that the metal hydroxide dissolves in the excess base by forming a complex.

For instance;

CuCl2(aq) + 2NaOH(aq)  -------> Cu(OH)2(s) + 2NaCl(aq)

Cu(OH)2(s) + 2OH^-(aq) -------> [Cu(OH)4]^2+(aq)

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Answer:

1cf gallon=7.481 us liquid gallon

The concentrations of all species in a 0.100 M Na₂CO₃ are:  

1. The concentration of Na⁺ in the solution is 0.2 M.

2. The concentration of CO₃²¯ in the solution is 0.1 M

We'll begin by writing the dissociation equation for Na₂CO₃. This is illustrated below:

Na₂CO₃(aq) —> 2Na⁺(aq) + CO₃²¯(aq)

Thus, the species in Na₂CO₃ are Na⁺ and CO₃²¯

From the balanced equation above,

1 mole of Na₂CO₃ contains 2 moles Na⁺ and 1 mole of CO₃²¯

1. Determination of the concentration of Na⁺.

From the balanced equation above,

1 mole of Na₂CO₃ contains 2 moles Na⁺

Therefore,

0.100 M Na₂CO₃ will contains = 2 × 0.1 = 0.2 M Na⁺

Thus, the concentration of Na⁺ in the solution is 0.2 M.

2. Determination of the concentration of CO₃²¯

1 mole of Na₂CO₃ contains 1 mole of CO₃²¯

Therefore,

0.100 M Na₂CO₃ will also contains 0.100 M CO₃²¯

Thus, the concentration of CO₃²¯ in the solution is 0.1 M

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The answer should be A

VisibleVisible wave length visible wavelength of light that are emitted by Adams can be used to get Nate explosive devices remotely

Answer:

lithosphere (land)

hydrosphere (water)

biosphere (living things)

atmosphere (air).

Answer:

A chromosome is a thread-like structure present in the nucleus  that is made up of a single molecule of DNA and proteins, carrying some or all genetic materials of an organism. A chromatid is an identical half of a duplicated chromosome

Explanation:

Answer:

Answer Below! : )

Explanation:

Groundwater is stored in the tiny open spaces between rock and sand, soil, and gravel. How well loosely arranged rock (such as sand and gravel) holds water depends on the size of the rock particles.

Hope this helps! : )

Answer:

Underground  brainliest plz

Explanation:

The mass of water produced by the reaction of the 23 g of [tex]SiO_2[/tex]  is 13.8 g.

The given chemical reaction;

[tex]4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)[/tex]

In the given compound above, we can deduce the following;

60 g of [tex]SiO_2[/tex]  --------- 36 g of water

23 g of [tex]SiO_2[/tex]  ------------- ? of water

[tex]mass \ of \ water = \frac{23 \times 36}{60} = 13.8 \ g \ of \ water[/tex]

Thus, the mass of water produced by the reaction of the 23 g of [tex]SiO_2[/tex]  is 13.8 g.

In the reaction of the given compound, [tex]4Hf (g) \ + \ SiO_2 (s) \ --> \ SiF_4(g) \ + \ 2H_2O(l)[/tex], what mass of water (in grams) is produced by the reaction of 23.0 g of SiO2?

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Answer:

propyl butanoate

Explanation:

Answer:

*result with sodium hydroxide: white ppt of Zn(OH)2

*excess sodium hydroxide: Precipitate dissolves to form a COLOURLESS solution

*Result with Aqueous ammonia: White ppt of Zn(OH)2

*excess aqueous ammonia: Precipitate dissolves to form a COLOURLESS solution

Explanation:

it is a permanent change

Answer: It is a permenat change

Explanation: Because you are creating it into something else and when it turns into that thing it stays like that permanatly.

NO- (isoelectronic or same as O2) is hard base

H+ is hard acid

bonding depends which pi* has more electron density and calc shows more on N...hence HNO is more likely (bent) molecule

whatever....

Answer:

D. 25 grams

Explanation:

I think that's what the answer is

Answer:

Oxygen has 6 valence electrons and follows the octet rule.

If you were drawing a lewis structure for O2, there would be a total of 12 valence electrons (6 x 2 = 12).

The completed structure would have a double bond between the two oxygen atoms with 2 lone pairs per oxygen, giving you a total of 8 electrons that are lone pairs (or dots).

Answer:

Filtration (The process of separating liquids and solids)

Explanation:

Filtration works best when the solute isn't dissolved in the solvent. Basically like how you can filter dirt or sand from water. The opposite of this would be if water and sugar where mixed together you cannot unmix this duo with filtration but with the example given you can use the process of filtration to rid the gasoline of sand.

70 tons of hematite (Fe₂O₃) is needed to produce 49 tons of iron (Fe).

We'll begin by calculating the tons of hematite (Fe₂O₃) that reacted and the tons of Fe produced from the balanced equation. This is illustrated below:

2Fe₂O₃ + 3C —> 4Fe + 3CO₂

Molar mass of Fe₂O₃ = (56×2) + (16×3) = 160 g/mol

Mass of Fe₂O₃ from the balanced equation = 2 × 160 = 320 g

Divide by 907185 to express in ton

320 / 907185 = 0.000353 ton

Molar mass of Fe = 56 g/mol

Mass of Fe from the balanced equation = 56 × 4 = 224 g

Divide by 907185 to express in ton

224 / 907185 = 0.000247 ton

From the balanced equation above,

0.000353 ton of Fe₂O₃ reacted to produce 0.000247 ton of Fe.

Finally, we shall determine the tons of hematite (Fe₂O₃) needed to produce 49 tons of Fe. This can be obtained as follow:

From the balanced equation above,

0.000353 ton of Fe₂O₃ reacted to produce 0.000247 ton of Fe.

Therefore,

X ton of Fe₂O₃ will react to produce 49 tons of Fe i.e

X ton of Fe₂O₃ = [tex]\frac{0.000353 * 49}{0.000247} \\\\[/tex]

X ton of Fe₂O₃ = 70 tons

Thus, 70 tons of hematite (Fe₂O₃) is needed to produce 49 tons of Fe.

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Answer:

both

Explanation:

id say that it could occur but also not as much. the moon would be smaller and further from the earth to where we would barely be able to see it. if the full moon is barely visible then im sure the total solar eclipse wouldn't be as noticeable as it is now. but thats just my opinion

Answer:

It's balanced but not in the lowest form

Explanation:

The actual equation is given by

[tex]\\ \sf\longmapsto 2NH_3\longrightarrow N_2+3H_2[/tex]

#5

At 22min the temperature is at 40°C

#6

Graph ended at 20°C so condetion occured at 20°C

#7

After 70°C the matter got melted do its at liquid state

Hydrochloric acid can cause damage if it comes into contact with your lungs, eyes, stomach, or skin. If hydrochloric acid comes into contact with your skin, it can cause: chemical burns. scarring.

Answer:

Explanation:

Aldehydes and Ketones. Aldehydes and ketones are classes of organic compounds that contain a carbonyl (C=O) group.

that's the correct answer

can I get brainilest

neutrons=117

protons=78

Answer:

Platinum has mass number 195.

The atomic number of platinum =78

so the number of protons is 78.

By using simple formulas

we can find out that how many neutrons and protons are present in an atom of platinum-195.

Mass number = neutrons + protons

195=neutrons + 78

neutrons=195-78=117

so the number of neutrons is 117.

Answer:

It improves the oxidative stability of the oil.

The hydrogenation process increases the melting point of the fat, which changes liquid oil into solid shortening.

Explanation:

Answer:

The side with lots of H+ and low pH

Explanation:

Because one of the feature of an acid is the ability to dissociate to H+.

And it has lower pH because the concentration of H+ is more than OH-

Answer:

What is the question?

Explanation:

You just gave a statement.

Answer:

it will increase

Explanation:

Answer: yes it is

Explanation:Bond order

The antibonding orbital is empty. Thus, H2 is a stable molecule

Answer:

[Ar] 4s²

Explanation:

The full electron configuration for the Ca+ ion is:

1s² 2s² 2p⁶ 3s² 3p⁶.

To determine the full electron configuration for a Ca+ ion, we need to remove one electron from the neutral calcium atom (Ca). The neutral calcium atom has the electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s².

When Ca loses one electron to form the Ca+ ion, the electron removed comes from the highest energy level, which is the 4s orbital.

Therefore, the full electron configuration for the Ca+ ion is:

1s² 2s² 2p⁶ 3s² 3p⁶.

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