Which of the following is composed of elements combined in a specific ratio?​

Answer:

Crystal / Crystalline Structure

Explanation:

These structures contain particles in a regular pattern, and we call them crystals.

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Answer: covalent bonding

Explanation: atoms that carries a net charge due to the fact that the total number of electrons in the molecule is not equal to the total number of protons in the molecule.

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Answer:

Yes, displacement is 45 meters, time is three seconds, and the direction is toward the goal. Velocity is 15 m/s towards the goal.

Explanation:

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Answer:

349 L (To 3 significant figures)

Explanation:

The reaction equation is;

C9H20(l) + 14O2(g) ------> 9CO2(g) + 10H2O(g)

number of moles of nonane in 0.210 Kg = mass/molar mass

molar mass of nonane = 9(12) + 20(1) = 128 gmol-1

Hence number of moles = 0.210 * 10^3g/128 gmol-1 = 1.64 moles

If 1 mole of nonane produced 9 moles of CO2 from the balanced reaction equation;

1.64 moles of nonane will produce 1.64 * 9/1 = 14.76 moles of CO2

Now from the ideal gas equation;

PV=nRT

P = 1 atm

V= the unknown

n= 14.76

R = 0.082 atmLmol-1K-1

T = 15 + 273 = 288 K

V= nRT/P

V = 14.76 * 0.082 * 288/1

V = 348.57 L

Answer:

e

Explanation:

Answer:

K

Explanation:

The picture that demonstrates a state of matter without a fixed shape or fixed volume is picture K.

Gases are one of the three states of matter without a fixed shape and volume. They simply take up the shape of their containers and are free to move all about.

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\[/tex]

From the question we have

[tex]volume = \frac{15.8}{0.802} \\ = 19.700748...[/tex]

We have the final answer as

Hope this helps you

Answer:

See explanation

Explanation:

The reaction of a benzyl bromide with a nucleophile may proceed by SN1 or SN2 mechanism depending on the nature of the solvent used.

Since SN1 reaction involves the formation of a carbocation, it usually predominates in the presence of a poor nucleophiles and protic solvents. Hence when methanol is used as solvent and a poor nucleophile is used, SN1 mechanism predominates.

However, when acetone which is an aprotic solvent is used in the presence of a good nucleophile, SN2 reaction mechanism predominates.

Answer: Its esterification reaction.

when organic acid react with alcohol it forms ester and water. reaction is known as esterification reaction.

CH3COOH + C2H5OH → CH3COOC2H5 + H2O

ethanoic acid + ethanol → ethyl acetate + water

this reaction takes place in the presence of acid catalyst ( dil H2SO4).

in this reaction oxygen of ethanol with lone pair act as nucleophile and carbonyl carbon of acetic acid act as electrophile.. so its nucleophilic substitution reaction of -COOH group.

Explanation:

The atomic radius trend on the Periodic Table is as follows:

- Atomic radius increases down a column (or group)

- Atomic radius decreases across rows (or periods) from left to right

Looking at my Periodic Table, calcium, chromium, cobalt and copper are in that order from left to right in the same period, which simplifies things significantly.

Since these elements are in the same period, and given that we know atomic radius decreases across periods from left to right, we can see that calcium has the largest atomic radius.

Answer:

Beaches.

Aquifers.

Sinkholes.

Caverns.

Coastal plains.

Upland (hilly areas)

Swampy Everglades.

Florida Keys (archipelago)

Explanation:

bc these are some of the landforms in flordida

Sinkholes are of interest in Florida because they are one of the frequent landform features of the State. Because they cause flooding during storms when the drainage capability of natural subsurface conduits is transcended. They supply an avenue for pollutants on the land surface to move rapidly.

Mountains, hills, plateaus, and plains are the main four types of landforms. Minor landforms consider buttes, canyons, valleys, and basins. Tectonic plate movement under Earth can develop landforms by pushing up mountains and hills.

In Florida's landscape is made up of “karst” landforms. A karst terrain is a land surface formed by water dissolving the bedrock and is characterized by sinkholes, cavern systems and disappearing streams and springs.

Thus, coastal erosion sinkholes sand dunes underwater earthquakes aquifers volcanic activity.

To learn more about landforms, follow the link;

https://brainly.com/question/17824484

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Answer:

The original concentration of the HCl is: 0.01925 M

Explanation:

Equation:

HCl+NaOH-------> NaCl+H₂O

Volume of NaOH added = 0.05 M

No of moles of NaOH = 15.4 mL [tex]x\frac{1 L}{1000 mL} x\frac{0.05 mol NaOH}{L}[/tex]

= 0.00077 mol NaOH

Then,

Volume of HCl solution = 40 mL x 1/1000 mL

= 0.0400 L

Therefore,

Concentration of HCl = 0.00077 mol/0.0400 L

= 0.01925 M

Now, to find the pH:

pH = -log₁₀[H⁺]

     = -log₁₀(2x10⁻⁶)

     = 5.7

Answer:

16mL.

Explanation:

From the Question above we have the following parameters/information which is going to help in solving this particular Question;

=> The mass methyl acetate that the student needed is = 15.0g.

=> The density of methyl acetate given is = 0.934 g/mL. (Kindly remember that formula for Determining density of a particular substance = density = mass/volume.

Hence, the volume of methyl acetate needed to be poured away can be calculated from the formula for calculating density.

Density = mass/ volume.

Density = 0.934 g/mL., and mass = 15.0g. Therefore, the volume = mass/density.

Volume = 15.0g/ 0.934 g/mL = 16 mL.

Answer:

47900 cm

General Formulas and Concepts:

Chemistry

Explanation:

Step 1: Define

0.479 km

Step 2: Identify Conversions

1 km = 1000 m

1 m = 100 cm

Step 3: Convert

[tex]0.479 \ km(\frac{1000 \ m}{1 \ km} )(\frac{100 \ cm}{1 \ m} )[/tex] = 47900. cm

Step 4: Check

We are given 3 sig figs. Follow sig fig rules.

47900. cm ≈ 47900 cm

Answer:

2.7g/cm³

Aluminum

Explanation:

Given parameters:

Mass of the cube  = 72.9g

Unknown:

Density of the cube = ?

Solution:

To solve this problem, we need to find the density of the cube. The mass is given and the dimensions of the solid figure.

Now;

       Density is the mass per unit volume of a substance

     Density  = [tex]\frac{mass}{volume}[/tex]  

Volume of the cube  = L³  = 3³   = 27cm³

So;

     Density  = [tex]\frac{72.9}{27}[/tex]   = 2.7g/cm³

The body is aluminum because it has a density of  2.7g/cm³

Answer:

someone is in my mind and it is telling me 5.55m

Explanation:

Answer:

4 mL

Explanation:

4mL is 5% of 80mL. Therefore my answer is right.

Answer:

C

Explanation:

Al=Aluminum

Mg=Magnesium

Answer:

Atoms in group 2a are likely to form ions with a +2 charge because they have two valence electrons, both of which experience a very weak pull from the nucleus due to electron shielding. This causes the atoms to be easily pulled away from the nucleus, creating the +2 ions we see in nature.

Atoms in group 7a are likely to form ions with a -1 charge because they are one electron away from completing their outermost shell. The large number of protons in the middle of these atoms also causes the valence electrons to experience a stronger net force. This force also pulls strongly on the valence electrons of other atoms, causing the -1 ions we see in nature.

Answer:

geruow0irghvn3p0unhie0ghik

Explanation:

Answer:

[tex]M_{K^+}=4.0M \\\\M_{SO_4^{2-}}=2.0M[/tex]

Explanation:

Hello!

In this case, since the molarity of a solution is defined as the moles of solute divided by the volume of solution liters, given the mass of potassium sulfate, we can compute the moles by using its molar mass (174.24 g/mol):

[tex]n_{K_2SO_4}=87gK_2SO_4*\frac{1molK_2SO_4}{174.27gK_2SO_4} =0.50molK_2SO_4[/tex]

Thus, since one mole of potassium sulfate has two moles of potassium ions (K₂) and one mole of sulfate ions, we can compute the moles of each ion as shown below:

[tex]n_{K^+}=0.50molK_2SO_4*\frac{2molK^+}{1molK_2SO_4}=1.0molK^+\\\\ n_{SO_4^{2-}}=0.50molK_2SO_4*\frac{1molSO_4^{2-}}{1molK_2SO_4}=0.50molSO_4^{2-}\\[/tex]

In such a way, the molarity of each ion turns out:

[tex]M_{K^+}=\frac{1.0mol}{0.250L}=4.0M \\\\M_{SO_4^{2-}}=\frac{0.5mol}{0.250L}=2.0M[/tex]

Best regards!

Answer:

Hope this helps

Explanation:

A generalization I can make about the Huang River is that the Huang River is the most important river in China. Also called the Yellow River, it is where historians believe ancient Chinese people settle in to develop its civilization on the banks of the river for the many benefits it had for life and agriculture. However, early Chinese people had to learn how to control the floods of the river in order to survive ad prosper.

Answer:

other guys is correct

Explanation:

Answer:

fou maybe

Explanation:

it was my answer hehe

Answer:2

Explanation:

Because it is

Answer:

There are:

Explanation:

First calculate the percentage of Cu and S in the compound:

These percentages will remain the same no matter how much of the compound we analyze.

Now we calculate the grams of Cu and S in 3801 kg of the compound:

Answer:

Tetrahedral

Bent

Explanation:

A molecule in sp3 hybridization is ordinarily expected to exhibit tetrahedral electron domain geometry. This implies that it has four electron domains.

We were specifically informed in the question that two lone pairs are present. Remember that lone pairs distort the molecular geometry away from the expected geometry based on VSEPR  theory.

Therefore, the bond angle of the molecule is <<109.5 degrees and its molecular geometry is bent (e.g water)

Answer:

I think vaccum

Explanation:

Answer:

It represents how light can go through something.

Explanation:

Answer:

NO + H₂O → HNO₂ + 1 e- + 1 H⁺

Step-by-step explanation:

NO ⇒ oxidation number of N = +2

HNO₂ ⇒ oxidation number of N= +3

Therefore, NO has to lose 1 electron to be oxidized to HNO₂. We write the half-reaction with 1 electron (1 e-) in the products side.

NO → HNO₂ + 1 e-

Now, we have 0 electrical charges in the reactants side, and a total of -1 electrical charge in the products side. As the reaction is in acidic aqueous solution, we have to add H⁺ ions to balance the charges. We perform the balance by adding 1 H⁺ (positive charge) to neutralize the negative charge in the side of the products:

NO → HNO₂ + 1 e- + 1 H⁺

Now, we perform the mass balance. We have:

N: 1 atom in both sides

O: 1 atom in reactants side and 2 atoms in products side

H: 0 atoms in reactants side, 2 atoms in products side.

Thus, we have to add 1 H₂O molecule to the reactants side to equal the masses:

NO + H₂O → HNO₂ + 1 e- + 1 H⁺

Finally, the oxidation half-reaction is:

NO + H₂O → HNO₂ + 1 e- + 1 H⁺

Answer:

CaCO3 is the limiting reactant

55 g of CO2 is made

Explanation:

First we must put down the reaction equation;

CaCO3(s) + 2HCl(aq) ---------> CaCl2(s) + H2O(l) + CO2(g)

Number of mole of CaCO3 = 125g/100gmol-1 = 1.25 moles

From the reaction equation;

1 mole of CaCO3 yields 1 mole of CO2

Hence 1.25 moles of CaCO3 yields 1.25 moles of CO2

For HCl;

number of moles of HCl = 125g/36.5 g mol-1 = 3.42 moles

From the reaction equation;

2 moles of HCl yields 1 mole of CO2

3.42 moles of HCl yields 3.42 * 1/2 = 1.71 moles of CO2

Hence CaCO3 is the limiting reactant.

Mass of CO2 produced = 1.25g * 44 gmol-1 = 55 g of CO2