Help e please i give brainlist

Explanation:

dissolve more quickly than a whole antacid tablet.

Answer:

This is not a chemical change

Explanation:

The dark green solution mixed with the water, but the water is still water. There were no bubbles, smell, temperature change, or any other signs of a chemical change

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A student mixes a dark green solution with water, and the result is pale green. This is a physical change.

Composition distinguishes a physical change from a chemical change. A physical change is a difference inside the look, smell, or straightforward presentation of a material sample without the need for a change in composition, whereas a chemical change alters the makeup of the substances in issue.

Despite the fact that we refer to them as physical "reactions," nothing is actually changing. A change in the substance in question's elemental composition is necessary for a reaction to occur. So, from now on, we will simply refer to bodily "reactions" as physical changes. A student mixes a dark green solution with water, and the result is pale green. This is a physical change.

Therefore, a student mixes a dark green solution with water, and the result is pale green. This is a physical change.

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Answer:

Because the rock underwent lava and heat/pressure transformation. They are cooled and heated by magma, and then under go pressure. No fossils would be found in those.

Explanation:

Hope this helps! :)

Answer:

Because...

Explanation:

Igneous rock is cooked in extreme hot temperatures.

Metamorphoc is lava cooled downed.

Answer: [tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]

Explanation:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.  

A double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.  

The equation which represents a precipiation reaction is:

[tex]AgNO_3(aq)+NaOH(aq)\rightarrow AgOH(s)+NaNO_3(aq)[/tex]

Explanation:

12 hours ago

El ácido sulfúrico H2SO4 es uno de los compuestos que se utiliza para la producción de fertilizantes como el nitrosulfato amónico. Si disponemos de 8 mL de H2SO4 al 37 %P/P (d=1,26 g /mL), los cuales se disolvieron hasta alcanzar un volumen de solución de 400 mL, con una densidad de 1,08 g/mL. (La densidad del soluto es corresponde a 1,83 g/cm³)

Answer:

HH and hh

Explanation:

they are the same

Answer:

9.15 atm

Explanation:

Ideal gas equation of state PV=nRT

P in hPa, V in L, n in mol, R is a constant which is 83.1 hpa*L/mol*k, T in kelvin.

Plug in all the number, and we will get:

P*6.21=2.02*83.1*343

P =9271.6(in hpa)=9.15 atm

Answer:

See below

Explanation:

The following reasons tell why atom combine to form compounds:

1) They want to follow octet or duplet rule and attain the noble gas configuration.

2) They combine to form compounds because of the electrostatic attraction between them.

3) They form compounds to lower their energy and to become stable.

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer:

Dirt

mud

rocks

ect.

Explanation:

Answer: about 1,705,536 hrs

24 hrs = 1 day

189 hrs = 1 week

756 = 1 month

9072 = 1 yr

1,705,536 = 188 yrs

Explanation:

Trust Milky. Milky smart

Answer:

LiCl because the total negative charge on Cl is one.

Explanation:

Lithium has a charge of 1+ and Chlorine has a charge of 1-.

There are two types of chemical compound one is covalent compound and other is ionic compound. LiCl because the total negative charge on Cl is one. The correct option is option A.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

Covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Ionic compounds are hard, these have higher melting and boiling point than the covalent compounds. Li act as cation Li⁺ and Cl act as Cl⁻. These two combine to form LiCl. LiCl is an ionic compound.

Therefore, LiCl because the total negative charge on Cl is one. The correct option is option A.

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Answer:

Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.

Hope this helped.

Answer:

7.96g, 33.79%

Explanation:

I'll try my best to explain the entire process behind this question ;)

From the question, you can write the reaction

[tex]2H_2O(l)->2H_2(g)+O_2(g)[/tex]

Now, there are a few reasons it is like this. Oxygen is a diatomic element, meaning it doesn't and can't exist as just O. It exists as O₂. To balance, this, double the amount of water and hydrogen so there is an equal amount of  each element on both sides of the reaction (4 H's, 2 O's on the reactant side, and 4 H's, 2 O's on the product side).

From this we can get a mole-to-mole ratio.

Onto the stoichiometry. Our goal in this is to convert from grams of water to grams of hydrogen, and we do so with a mole to mole ratio.

[tex]71.0gH_2O*\frac{1molH_2O}{18.02g} *\frac{2molH_2}{2molH_2O}* \frac{2.02g}{1molH_2}\\\\ =7.96gH_2[/tex]

Basically, what I did was divide by water's molar mass to get moles of water, multiplied by the mole-to-mole ratio (2:2) to get moles of H2, and then multiplied by H2's molar mass to get what should be the amount of H2 produced by the reaction.

For percent yield, you can calculate it is such:

[tex]\frac{Actual}{Theoretical}*100[/tex]

Plug the numbers in:

[tex]\frac{2.69g}{7.96g}*100\\\\ =33.79%[/tex]

So, the percent yield is 33.79%

Answer:

1- gram of oxygen, 2- 3.01x1023 atoms of oxygen, 3- 1 molecule of oxygen, 4- 1mole of oxygen, 5- 1atom of oxygen.

Answer:

B

Explanation:

A body moving with a constant speed and constantly changing direction and changing velocity is said to be in circular motion.

Answer:

For Feo is 2+

For Fe2O3 is 3+

Btw I did it and got it right!

Explanation:

The charge of the Fe ion in the compound [tex]\rm FeO[/tex]is +2 and the charge of the Fe ions in the compound [tex]\rm Fe_2O_3[/tex] is +3, respectively.

Ion can defined as any atom or molecule having positive or negative charge on it.

In [tex]\rm FeO[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the iron ion must have a charge of +2 to balance the charges and make the compound neutral.

In [tex]\rm Fe_2O_3[/tex]: In the compound, oxygen is in group 16 and has a charge of -2, the three oxygen atoms in [tex]\rm Fe_2O_3[/tex] contribute to a total charge of -6. To make the compound neutral, the two iron ions must have a total charge of +6. Therefore, each iron ion must have a charge of +3 to balance the charges and make the compound neutral.

Therefore, Fe ion has a charge of +2 in the compound [tex]\rm FeO[/tex] and has a charge of +3 in the compound [tex]\rm Fe_2O_3[/tex].

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Answer:

1 and 4

Explanation:

Answer: The partial pressure of the dry gas is 599.8 torr

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

[tex]p_{total}=p_{dry gas}+p_{H_2O}[/tex]

Given : [tex]p_{total}[/tex] =total pressure of gases = 642 torr

[tex]p_{dry gas}[/tex] = partial pressure of dry gas = ?

[tex]p_{H_2O}[/tex] = partial pressure of water = 42.2 torr

putting in the values we get:

[tex]642torr=p_{\text {dry gas}}+42.2torr[/tex]  

[tex]p_{\text {dry gas}}=599.8torr[/tex]

Thus the partial pressure of the dry gas is 599.8 torr

Answer:

575 g

Explanation:

1 kg of sodium hydroxide is 1000/40=25 mol.

So 25 mol of sodium will be needed.

25 mol of sodium is 575 g.

According to the stoichiometry of the given chemical equation, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

46 g sodium gives 80 g sodium hydroxide, thus 1000 g sodium hydroxide requires 46×1000/80=575 g sodium.

Thus, 575 g s of sodium would be needed to produce 1.00 kg of sodium hydroxide.

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moles of He=4 L/22.4 L=0.1786 mol

moles of Ne=2 L/22.4 L=0.0893 mol

total moles of the gas mixture

=0.1786+0.0893

=0.2679 mol

mole fraction of He=0.1786 mol/0.2679 mol=0.6667

mole fraction of Ne=0.0893 mol/0.2679 mol=0.3333

Answer:

[tex]6.05211\times 10^{23}\ \text{atoms}[/tex]

Explanation:

Moles of carbon dioxide = 1.005 moles

[tex]N_A[/tex] = Avogadro's number = [tex]6.022\times 10^{23}\ \text{mol}^{-1}[/tex]

Number of atoms is given by

[tex]\text{Moles}\times N_A=1.005\times 6.022\times 10^{23}[/tex]

[tex]=6.05211\times 10^{23}\ \text{atoms}[/tex]

The number of atoms in the given amount of moles of carbon dioxide is [tex]6.05211\times 10^{23}\ \text{atoms}[/tex].

Answer:

22.41 Liters

Explanation:

Using the general law equation;

PV= nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

According to the information provided in this question,

mass of water vapor = 18g

Molar mass of water (H2O) = 1(2) + 16 = 18g.

mole = mass/molar mass

- mole (n) = 18/18 = 1mol

V = ?

T = 273K

p = 1 atm

Using PV = nRT

V = nRT/P

V = 1 × 0.0821 × 273/1

V = 22.41 Liters

Answer:

about 4.8kJ

Explanation:

There is some missing information in the question given.

For use to determine the amount of heat that must be reacted in the system to convert 100g of NaNO₃ into NaHSO₄(s);

Then, we need to consider the following reaction between sodium nitrate (NaNO₃)  and sulfuric acid (H₂SO₄):

[tex]\mathbf{NaNO_{3(s)}+ H_2SO_{4(l)}\to NaHSO_{4(s)}+HNO_{3(g)} \ \ \ \ \ \Delta H = 21.2 \ kJ}[/tex]

From the above reaction, 84.99 gm of NaNO₃ reacted with H₂SO₄ which is converted into NaHSO₄ thereby absorbing 21.2 kJ amount of heat.

This implies that; if 84.99 gm of NaNO₃ absorbs 21.2 kJ amount of heat.

1 gm of NaNO₃ will absorb = [tex]\mathsf{\dfrac{21.2}{84.99} \ kJ \ heat}[/tex]

= 0.2494 kJ amount of heat.

∴

100 g of NaNO₃ will absorb [tex]= \mathsf{\dfrac{21.2}{84.99} \times 100 \ kJ \ heat}[/tex]

= 24.94 kJ amount of heat.

Therefore, we can conclude that the amount of heat that must be absorbed by the reaction system to convert 100g of NaNO3 into NaHSO4(s) is 24.94 kJ.

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Explanation:

Since methane gas is at 1 atm and 273 K, it is at standard temperature and pressure(STP).

One mole of every gas occupies 22.4 dm^3 at STP, and vice versa. So,

22.4 dm^3 at STP of CH4=1 mol=12+4(1)=16 g

0.462 L(0.462 dm^3) at STP of CH4

=(16 g×0.462 dm^3)/22.4 dm^3

=0.33 g

Answer:

3(NH4)2S + 2AlCl3 → 6NH4Cl + Al2S3

Explanation:

Firstly, ammonium sulfide has a chemical formula of (NH4)2S while aluminum chloride has a chemical formula of AlCl3. These two chemical substances react as follows:

(NH4)2S + AlCl3 → NH4Cl + Al2S3

This chemical equation is however, unbalanced. To balance the chemical equation, one has to ensure that the atoms of each element on both the reactant and product side equates with one another.

If we carefully observe each atom on both the reactants and product side, we will have the following balanced equation:

3(NH4)2S + 2AlCl3 → 6NH4Cl + Al2S3

That is;

- 6 moles of N and Cl on both sides

- 24 moles of H on both sides

- 3 moles of S on both sides

- 2 moles of Al on both sides

Answer:

Explanation:

If observed through the year, the constellations shift gradually to the west. This is caused by Earth's orbit around our Sun. In the summer, viewers are looking in a different direction in space at night than they are during the winter.

1- Base substitutions.

2- Deletions.

3- Insertions.

Answer:

The primary reason is that the sun is low on the horizon all day. Thus, solar energy needs to pass through more atmosphere to get to the ground.

Explanation:

Hope this helps. :)

Answer:

Most all of the visible light striking the snow or ice surface is reflected back without any particular preference for a single color. Most natural materials absorb some sunlight, which gives them their color. Clean snow, however, reflects most of the sunlight, creating a white appearance.

[ I commented on the other answer with the same little add-on, then I realised I could add an answer. Even though this is four days ago, meaning the person who asked the question doesn't need another answer, I hope to give someone else who might be looking at this some insight. ]