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Answer:

All the gases have the same number of molecules.

Answer:

Explanation:

ndicator species (IS) are animals, plants, or microorganism used to monitor changes in our environment. For example, they can tell us about the impact of pollution on an ecosystem, or how well an impaired environment is being managed or restored.

Neutralization reaction

Hello, in the following reaction HBr is strong acid when reacts with Amphoteric Aluminium hydroxide gives water & AlBr3 as salt.

We know that in neutralization reaction

acid & bases reacts to give salt and water. Hence following reaction is neutralization reaction.

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Answer:

FILTRATION.

filter the solution and separate sand and salt solution

evaporation

evaporate the water and salt mixture and salt will be left as a solid

Answer:

Mass ratio:

a. Approximately [tex]51.2\%[/tex].

b. Approximately [tex]35.3\%[/tex].

c. Approximately [tex]43.2\%[/tex].

Explanation:

Look up the relative atomic mass of each element on a modern periodic table:

For example, the relative atomic mass of [tex]\rm Al[/tex] is [tex]26.982[/tex]. Hence, the mass of one mole of [tex]\rm Al\![/tex] atoms would be (approximately) [tex]26.982\; \rm g[/tex].

Calculate the formula mass of [tex]\rm H_2O[/tex]:

[tex]\begin{aligned} & M({\rm H_2O}) \\ &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the formula mass for each of the hydrates:

[tex]\begin{aligned}& M({\rm MgSO_4 \cdot {7\, H_2O}}) \\ &= 24.305 + 32.06 + 4 \times 15.999 \\ & \quad\quad + 7 \times (2 \times 1.008 + 15.999) \\ &= 246.466\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm LiC_2H_3O_2 \cdot {2\, H_2O}}) \\ &= 6.94 + 2 \times 12.011 + 3 \times 1.008 + 2 \times 15.999 \\ & \quad\quad + 2 \times (2 \times 1.008 + 15.999) \\ &= 102.014\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm Al(NO_3)_3 \cdot {9\, H_2O}}) \\ &= 26.982 + 3 \times (14.007 + 3 \time 15.999) \\ &\quad \quad + 9 \times (2 \times 1.008 + 15.999) \\ &= 375.129\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

The mass of [tex]1\; \rm mol[/tex] of [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units is [tex]246.466\; \rm g[/tex].

There are seven mole of [tex]\rm H_2O[/tex] formula units in that many [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units. The mass of that [tex]7\; \rm mol[/tex] of [tex]\rm H_2O\![/tex] formula units would be [tex]7 \; \rm mol \times 18.015\; \rm g \cdot mol^{-1} = 127.105\; \rm g[/tex].

Hence, the percentage mass of [tex]\rm H_2O[/tex] in [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] would be:

[tex]\begin{aligned}\frac{127.015\; \rm g}{246.466\; \rm g} \approx 51.2\%\end{aligned}[/tex].

Similarly:

Answer:

Field of repulsion.

Explanation:

An experiment can be defined as an investigation which typically involves the process of manipulating an independent variable (the cause) in order to be able to determine or measure the dependent variable (the effect).

This ultimately implies that, an experiment can be used by scientists to show or demonstrate how a condition causes or gives rise to another i.e cause and effect, influence, behavior, etc in a sample.

Cause and effect can be defined as the relationship between two things or events in which an occurrence one (cause) leads to the occurrence of another (effect).

In this scenario, a teacher sprinkles some iron shavings on a clear tray. She places two magnets in the shavings with the north ends facing each other. Based on the cause-and-effect relationship between the magnets, the phenomenon the teacher is modeling for her students is field of repulsion.

Generally, the two north ends of a magnet have the same polarities and as such are considered to be like charges.

Hence, the field of repulsion is a phenomenon that is based on the fact that like charges repel while unlike charges attract. Thus, the north end of a magnet would repel the north end of another magnet placed beside it.

Answer: 1.5 moles/L

Explanation:

Molarity = moles/ Liters

to find the molarity of BaO: 3moles/2L = 1.5 moles/L

Answe AgNO₃

1:1:3 ratio

We have that for the Question "How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C." it can be said that Moles of gas is

n= 0.059 moles of gas

From the question we are told

How many moles of a gas are in a 2.2-liter balloon at 600 mmHg and 85 C. Also asks to identify the P, V, N, R, and T. If unknown then put "?"

Generally the equation for the   is mathematically given as

[tex]P=\frac{600}{760}\\\\P=0.789atm[/tex]

Therefore

[tex]n=\frac{PV}{RT}\\\\Therefore\\\\n=\frac{PV}{RT}\\\\n=\frac{0.789*2.2}{0.08206*(85 + 273)}\\\\[/tex]

n= 0.059 moles of gas

Therefore

Moles of gas is

n= 0.059 moles of gas

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Answer:

Shaking exposes the salts to the solvent more quickly. Shaking helps more water evaporate. Shaking equalizes the water temperature. Shaking causes more ions to precipitate out of solution.

Explanation:

Answer:

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Answer:

Yes, a chemical reaction has occurred

Explanation:

A chemical change is known to lead to the appearance of a new substance. Another name for chemical change is chemical reaction.

The new substance is formed when the bonds in the reactants are being rearranged to yield the products of the reaction.

In this case, two clear liquids were mixed and the contents of the system interacted briefly to yield a new product which appears as the white powder suspended in a clear,  colorless liquid.

Answer:

When salt dissolves in water, sodium and chloride ions are pulled apart to form new weak bonds with water molecules. Pulling them apart takes energy, while forming new bonds with the water molecules releases energy. Hope it helped (=^･ｪ･^=)

Answer:

I believe it is a chemical change

Explanation:

because it is changing into something new

Answer:

No.

Materials like water get evaporated when heated, but materials like camphor get sublimed that is they directly get converted into gaseous form when heated, while materials like copper gets melted on heating

Answer:

high temperature

Explanation:

Answer: Your answer is J

Explanation: This can occur when moon is closest to earth.

So the moon in between earth and sun.

Also factually the moon can effect human behavior, because humans are made up of some percent of water.

Answer:

amplitude or pitch

Explanation:

Answer:

Covalent bonding is a type of chemical bonding which is characterized by atoms sharing electrons. For nitrogen and chlorine to covalently bond, nitrogen needs 3 electrons. Chlorine only has one electron therefore two more chlorine molecules are needed. Because one atom of nitrogen needs 3 atoms of chlorine to bond, the formula will be NCl3.

Answer:

Explanation:

They're all forms of science!  

Answer:

photosynthesis

Explanation:

Answer:

Photosynthesis

Explanation:

I had it on a quiz.

Answer:

See explanation

Explanation:

On the pH scale acidity ranges from pH values of 0-6.9. Natural rain water is slightly acidic due to the presence of carbon dioxide in the atmosphere which is an anhydride of carbonic acid.

CO2(g) + H2O(l) -------> H2CO3(aq)

B. The equations that turn sulfur to sulfuric acid are;

S(l) + O2(g) -----> SO2(g)

2SO2(l) + O2(g) -----> 2SO3(g)

SO3(g) + H2SO4(l) -----> H2S2O7(l)

H2S2O7(l) + H2O(l) ----> 2H2SO4(l)

-

At pH 6, H^+ concentration = 1 * 10^-6 M

At pH 2, H^+ concentration = 1 * 10^-2 M

Hence;

1 * 10^-2/1 * 10^-6

= 10^4 times more acidic

Answer:

Albedo affects the climate by controlling the amount of radiation a particular planet absorbs, weather can also depend on how much the earth absorbs radiation in case of the earth.

.

How does the water help a fossil form?

The answer is 1

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Answer:

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Answer:

84% yield

42/50 = 0.84 = 84%

Answer:

B. Volcanoes

Explanation:

B. Volcanoes

Answer:

B:Volcanoes

Explanation:

because valley rift develops

Answer:

Beryllium.

Silicon.

Explanation:

Beryllium has 2 electrons in their outermost shell and has highly reactive than boron because Boron needs 3 electrons to lose whereas, beryllium needs to lose only 2 electrons to get stability. Silicon has 4 electrons in its outermost shell and is less reactive than aluminum because aluminum has to lose 3 electrons to get stability as compared to silicon which needs 4 electrons to lose to be stable and non-reactive.

Answer:

Liquids and gases flow easily because their particles can move or slide past one another.

Explanation:

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