stoichometry in chemistry!! please someone help i'm begging you, if i fail this then i fail chemistry

Answer:

All of these are part of an atom.

use dimensional analysis and set up your equation like so:

[tex]=220g\ x\ \frac{cm^3}{55g}[/tex]

the unit grams would cancel which leaves the unit of cm³, which is the unit for volume in this case.

The volume of 220g of an object with a density of 55g/cm³ is 4 cm³.

Answer:d the surface of the road will break and cracks will appear in the ground :)

Explanation:

Answer:

2 molecules of hydrogen and 1 molecule of oxygen

Explanation:

The question is unclear, but if you are asking how many molecules are in one molecule of water, it is the answer provided above.

Here you go hope this helps :))

Answer:

cold and windy

Explanation:

if its 10 degrees outside then it must be cold. then 75 mph that is very windy

lipids

Explanation:

steroids belong to the class of of biochemicals called lipids.

Answer:

However, carbon dioxide dissolved into the ocean causes seawater to acidify, threatening the ability of shellfish and corals to build their skeletons and affecting the health of other fish and marine species—many that are important to coastal economies and food security.

Explanation:

Answer:

Option D

Explanation:

Discovering microwaves would be pure science. Using them in a constructive way would be applied science.

The equivalent capacitance between b and c is 9.2 PF.

A capacitor is a device which store electrical energy in an electric field.

A. capacitor c2 and c3 are in parallel

Cbc = C2 + C3

Cbc = 9.8 + 8.0

Cbc = 18 PF

B. When C1 and Cbc are in series

[tex]\rm Cac = \dfrac{C_1 \times C_b_c}{C_1 + C_b_c} = \dfrac{19 \times 18}{19 + 18 } = 9.24\;PF[/tex]

Thus, the equivalent capacitance between b and c is 9.2 PF.

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The balanced molecular equation for the neutralization of sodium hydroxide with sulfuric acid is:

Sodium hydroxide + Sulfuric acid →  Sodium sulfate +water

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.

In the given reaction, the reactants have been sulfuric acid and sodium hydroxide. Thus, these are written on the left side of the right arrow. The sodium sulfate and water have been the products and written on the right side of the right arrow.

The balanced molecular equation for the neutralization of sodium hydroxide with sulfuric acid is:

Sodium hydroxide + Sulfuric acid →  Sodium sulfate +water

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Ammonia yields nitric oxide and water in the presence of oxygen. The mass of nitric acid that will be produced from 6.40 gm of oxygen is 4.8 grams.

Mass is the product of the moles of the substance and its molar mass. it is given as,

[tex]\rm mass = moles \times molar\; mass[/tex]

The balanced chemical reaction is shown as:

[tex]\rm 4NH_{3} + 5O_{2} \rightarrow 4NO + 6H_{2}O[/tex]

Moles of oxygen are calculated by mass, 6.40 gm as,

[tex]\begin{aligned} \rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{6.40}{32}\\\\&= 0.2\;\rm moles \end{aligned}[/tex]

From the reaction, the molar ratio of nitric oxide to oxygen is 4: 5 and is used to calculate the moles of nitric oxide as,

[tex]0.2 \times \dfrac{4}{5} = 0.16[/tex]

0.16 moles and molar mass, 30 of nitric oxide is used to calculate the mass as,

[tex]0.16 \times 30 = 4.8 \;\rm gm[/tex]

Therefore, 4.8 grams of nitric oxide will be produced.

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Answer:

A real gas is one that deviates from ideal behavior.

Explanation:

This is due to the effects of gas particles occupying a finite volume.

Answer:

.135 L

Explanation:

P1V1 = P2V2

1*2=.27*V2

(1*2)/.27 = V2

V2 = .27 ÷ 2 = .135

The pH at 25.0 °c of an aqueous solution that is 0. 100 m in acetic acid is 5.744.

The acid dissociation constant is the equilibrium constant of an acid's dissociation reaction.

The ka is given [tex]1. 8 \times 10^-^5[/tex]

From the equation pf ka for weak acid

[tex]\rm H^+ = \sqrt{Ka \times C}[/tex]

Putting the values in the equation

[tex]\rm H^+ = \sqrt{ 1. 8 \times 10^-^5 \times 0.100 } = 0.0000018[/tex]

Now, the [tex]\rm pH = -log[H^+][/tex]

[tex]\rm pH = -log[0.0000018] = 5.744[/tex]

Thus, the pH of acetic acid is 5.744

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The heat required to convert water is given as the product of the mas and the latent heat. 28.34 kJ heat must be removed from the water to change it into ice.

Heat energy is the product of mass, specific heat capacity, and temperature change. It is given as,

[tex]\rm Q = mc \Delta T[/tex]

Given,

Mass of water = 456 gm

Specific heat capacity = 4.186 J / g K

Temperatutre change = 14.85 K

Substituting values above:

[tex]\begin{aligned} \rm Q &= 456 \times 4.186 \times 14.85\\\\&= 28345.91\;\rm J\\\\&= 28.34\;\rm kJ\end{aligned}[/tex]

Therefore, 28.34 kJ of heat energy should be removed from the water.

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Answer:

See below

Explanation:

A  Reactants

B  Activation energy

C  transition state

D  enthalpy change

E   products

The colon removes water and some nutrients and electrolytes from partially digested food.

All it means is that there's an intimate physical mixture of the specified components in a solid or liquid phase.

The large intestine has 3 primary functions: absorbing water and electrolytes, producing and absorbing vitamins, and forming and propelling faeces toward the rectum for elimination.

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Answer:

genes are small sections of DNA. These genes contain instructions that tell your cells to make molecules called proteins. And the protein do things to your body to keep you healthy. Genes determine traits as well.

[tex]\text{Molarity,}~ S= 2.1~mol/L\\\\\text{Molar mas of}~ NaHCO_3, ~M=84~~ g/mol\\\\\text{Volume,}~~ V = 1 ~L\\\\\text{Mass,} ~w = ?[/tex]

[tex]\text{ We know that,}\\\\~~~~~S = \dfrac{n}V\\\\\implies n = SV\\\\\implies \dfrac{w}{M} = SV\\\\\implies w = SVM\\\\\implies w= 2.1 \times 1 \times 84\\\\\implies w =176.4 ~ g[/tex]

The description that correctly describes the acidity or the basicity of a solution is that:

The higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

The pH of a solution is determined by the strength of the acid and the base pair. Both of these are dependent on the same chemical reaction.

As the pH rises, the the hydroxide ion is increased in concentration and the solution gets to be more basic.

acidity -the amount of H+ ions can be produced by a compound determines the acidity

pH range:less than 7

acidity increase with decrease in pH number

basicity- the amount of OH- ion can be produced by a compound determines basicity

pH range : 8 to 14

7 is neutral

Basicity increases with increase in number.

Therefore the higher the pH is, the more the hydroxide ion concentration increases and the more basic the solution becomes.

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A spring tide represents a natural process where more energy is produced when compared to other days in order to turn a turbine.

A renewable energy can be defined as any source of energy that is reversibly obtained from the nature.

In conclusion, a spring tide represents a natural process where more energy is produced compared to other days in order to turn a turbine.

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Answer:

C. during a spring tide

Explanation:

:D

Nitrogen fixing bacteria are important to all ecosystems because they make use of atmospheric nitrogen into biological nitrogen.

The bacteria Azotobacter, Bacillus, Clostridium, and Klebsiella are examples of this class of nitrogen-fixing bacterium.

Many heterotrophic bacteria survive in soil and fix large amounts of nitrogen without interacting with other organisms.

Hence they are important because they convert the atmospheric nitrogen for the biological use.

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Answer:

Explanation:

4.5x10x10x10x10x10 can be written as 4.5^5, by the way.

The sum of 4.5^5 is 450,000.

450,000 divided by 300 is 1500.

Hope this helps!

Explanation:

4.5×10×10×10×+0×10=4500000

450000÷300

remove zeros

4500÷3

=1500

Answer:

naoh + hci-> naci+ h20 me x v1 = me x v2

Mass is the multiplication product of moles and the molar mass. The mass of the lead chloride formed from 1.50 M potassium chloride is 10.42 gm.

The molarity of the solution is the ratio of the moles to the volume of the solution.

The double displacement reaction is shown as,

[tex]\rm 2KCl + Pb(NO_{3})_{2} \rightarrow PbCl_{2} + 2KNO_{3}[/tex]

From the reaction, it can be said that the stoichiometry ratio of potassium chloride and lead chloride is 2:1.

Given,

Molarity of potassium chloride = 1.50 M

1 L of potassium chloride = 1.50 moles

So, 50.0 ml will have,

[tex]\dfrac{1.50 \times 50}{1000} = 0.075\;\rm moles[/tex]

Moles of lead chloride formed will be:

[tex]\begin{aligned} &= \dfrac{1}{2} \times \text{number of KCl moles reacted}\\\\&= \dfrac{0.075}{2}\\\\&= 0.0375\;\rm moles\end{aligned}[/tex]

Given,

Moles of lead chloride = 0.0375 moles

Molar mass of lead chloride =  278 g/mol

Mass of lead chloride is calculated as:

[tex]278 \times 0.0375 = 10.42 \;\rm gm[/tex]

Therefore, 10.42 gm of lead chloride is formed.

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Answer:

Chlorine has 18 neutrons.

Explanation:

Mass number = Atomic number + No. of neutrons

No. of neutrons = Mass number - Atomic  number

                          = 35  -17

                          = 18 Neutrons