Need help on this one

Answer: 0.5

Explanation:

Answer: alkyl halide

Explanation: brianlist please?

Answer:

12.18 cc

Explanation:

From the question given above, the following data were obtained:

Density = 1.56 g/cc

Mass = 19 g

Volume =?

The density of a substance can be defined as the mass per unit volume of the substance. Mathematically, it can be expressed as:

Density = mass / volume

With the above formula, we can obtain the volume of the sucrose as follow:

Density = 1.56 g/cc

Mass = 19 g

Volume =?

Density = mass / volume

1.56 = 19 / volume

Cross multiply

1.56 × volume = 19

Divide both side by 1.56

Volume = 19 / 1.56

Volume = 12.18 cc

Therefore, the volume occupied by the sucrose is 12.18 cc

Answer:

A? or maybe C?

Explanation:

Hot is heat... right? so is warm.. Am i missing something?

Answer:

The answer is D

Explanation:

I got it correct on the quiz.

Answer:

la respuesta es la letra a

In solid carbon dioxide (dry ice), the particles are held together by strong covalent bonds, so they do not move around much.

What is the carbon dioxide?

Carbon dioxide (CO2) is an odorless, colorless gas created through natural processes such as respiration, combustion and the breakdown of organic materials. As a greenhouse gas, it is a major component of the Earth’s atmosphere and plays a critical role in regulating the global climate. Carbon dioxide is made up of one carbon atom and two oxygen atoms, and is produced when fossil fuels such as coal and oil are burned. Plants and trees also use carbon dioxide as part of their photosynthesis process. Carbon dioxide is essential for life on Earth, however, too much of it can have a negative impact on our planet. As human activity has increased over the past century, so too has our production of CO2, resulting in higher concentrations of this gas in the atmosphere and contributing to global warming.

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Answer:

A. NO₃⁻ ⇒ +5

B. NO₄⁺ ⇒ +9

C. N₂ ⇒ 0

D. NH₂OH ⇒ -1

E. NO₂⁻ ⇒ +3

Explanation:

To calculate the oxidation number of an element in a compound, we have to know the oxidation number of the other elements. Then, we have to consider that the sum of the oxidation number of each atom multiplied by the subscripts is equal to the net charge of the compound.

A. NO₃⁻

This is the ion nitrate. Oxygen atoms (O) has an oxidation number of -2 because it derives from an oxide. In this case, the net charge of the ion is -1. Thus, we calculate the oxidation number of N as follows:

N + (3 x (-2)) = -1

N - 6 = -1 ⇒ N= -1 + 6 = +5

B. NO₄⁺

In this case, the sum of the oxidation numbers of O and N multiplied by the subscripts is equal to +1:

N + (4 x (-2)) = +1

N - 8 = +1 ⇒ N = +1 +8 = +9

C. N₂

The oxidation number of N is 0 because N₂ is an elemental substance.

D. NH₂OH

The oxidation number of H is +1 and -2 for O. The net charge of the molecule is 0.

N + (H x 3) + (O) = 0

N + (+1 x 3) + (-2) = 0

N + 3 -2 = 0 ⇒ N = 2 - 3 = -1

E. NO₂⁻

The net charge of the ion nitrite is -1.

N + (2 x O) = -1

N + (2 x (-2)) = -1 ⇒ N = -1 + 4 = +3

Therefore:

Highest oxidation number = B. NO₄⁺ (+9)

Lowest oxidation number = D. NH₂OH (-1)

Answer:

Explanation:

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The oxidation number of the atoms in the given compounds are :

K₂O: K = + 1; O = -2;

PO₃⁻³: P = +3; O = -2

NH₃: N = -3; H = +1

Cu(NO₃)₂: Cu = +2; N = +5; O = -2

NO₃⁻¹: N = +5;  O = -2

CO₂: C = +4; O = -2

KClO₃: K = +1; Cl = + 5; O = -2

O₂: O = 0

Ca(ClO₄)₂: Ca = +2; Cl = +7; O = -2

The number of electrons an atom or ion has either gained or lost in comparison to the neutral atom is known as the oxidation number or state of the atom or ion.

Group I, 2, and 3 electropositive metal atoms lose a certain number of electrons, and their positive oxidation numbers remain constant.

The oxidation number of the atoms in the given compounds are as follows:

K₂0

K = + 1

O = -2

Sum is (+1 * 2) + (-2) = 0

PO₃⁻³

P = + 3

O = -2

Sum is (+3) + (-2 * 3) = -3

NH₃

N = -3

H = +1

Sum is (-3) + (+1 * 3) = 0

Cu(NO₃)₂

Cu = +2

N = +5

O = -2

Sum is (+2) + (+5 * 2) + (-2 * 6) = 0

NO₃⁻¹

N = +5

O = -2

Sum is (+5) + (-2 * 3) = -1

CO₂

C = +4

O = -2

Sum is (+4) + (-2 * 2) = 0

KClO₃

K = +1

Cl = + 5

O = -2

Sum is (+1) + (5) + (-2 * 3) = 0

O₂

O = 0

Sum is (0 * 2) = 0

Ca(ClO₄)₂

Ca = +2

Cl = +7

O = -2

Sum is (+2) + (+7 * 2) + (-2 * 8) = 0

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There is a golden rule of solubility, non polar solute dissolve in non polar solvent and polar solute dissolve in polar solvent. Therefore, the correct option is option B.

Solution is a homogeneous mixture of two or more than two substances. A solution is a homogeneous mixture of solute and solvent molecules. Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution.

There are two types of mixture that is homogeneous and heterogeneous. Solution is a homogeneous solution. The nature of solvent tells about whether the solvent is in liquid, solid or gas form.

Let amount of 30% to mix, be X

Then amount of 18% to mix = 300 - X

0.3X + 0.18(300 - X) = 0.21(300)

0.3X+ 0.18(300) - 0.18X= 0.21(300)

0.3X - 0.18X =0 .21(300) -0 .18(300)

0.12X =0 .03(300)

X=75L

Therefore, the correct option is option B.

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Answer:

5.4

Explanation:

The lower the pH the more H3o+ ions there are

Answer:

Because fresh water flowing into the estuary is less salty and less dense than water from the ocean, it often floats on top of the heavier seawater. ... For example, a heavy spring rain, or a sustained shift in local winds, can drastically affect the salinity in different parts of an estuary.

Answer:

The amount, in grams, of water that can be made when 12.1 moles of [tex]HNO_3[/tex] are consumed would be 72.54 grams.

From the balanced equation of the reaction, the mole ratio of [tex]HNO_3[/tex] to water is 3:1.

This means that for every 3 moles of [tex]HNO_3[/tex], 1 mole of water will be produced.

3 mole [tex]HNO_3[/tex] = 1 mole water

12.1 moles HNO3 = 12.1x1/3

                             = 4.03 mol

Recall that: mass = mole x molar mass

The molar mass of water is 18 g/mol

Thus, the mass of 4.03 mol of water = 4.03 x 18 = 72.54 grams

In other words, going by the equation of the reaction, the mass of water that can be made when 12.1 moles of [tex]HNO_3[/tex] are consumed would be 72.54 grams.

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Answer:

c?

Explanation:

Answer:

b

Explanation:

The lewis structure of NO₃⁻ is trigonal planar and the Lewis structure of ozone (O₃) has a resonance form.

Lewis structures which are also often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.

NO₃⁻ has a trigonal planar Lewis structure. It has one nitrogen atom, three oxygen atoms, and covalent bonds holding the three oxygen atoms together. The sp² hybridization of the nitrogen atom gives NO₃⁻- its trigonal planar structure.

Three oxygen atoms make up the oxygen allotrope known as ozone (O₃). One double bond and one single bond make up the Lewis structure of ozone. Additionally, two oxygen atoms in the Lewis structure of O3 carry charges.

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Answer:

pH of the base solution after the chemist has added 213.6 mL of the HNO3 solution to it is 9.96

Explanation:

Calculating the moles of dimethylamine  

Moles of dimethylamine  = molairty * volume in L = 0.63*0.0992   = 0.0625moles

Moles of HNO3               = molarity * volume in L = 0.25*0.2136    = 0.0534 moles

The balanced chemical equation is

(CH3)2NH + HNO3 -------------------> (CH3)2NH2^+    +   NO3^-

I                  0.0625         0.0534                               0                  

C                 -0.0534       - 0.0534                              0.0534

E               0.0091               0                                   0.0534

As we know ,  

POH   = Pkb + log[(CH3)2NH2^+]/[(CH3)2NH]

= 3.27 + log0.0534/0.0091                                  

= 3.27+ 0.768

= 4.038                  

PH      = 14-POH

= 14-4.038   = 9.96  

The temperature at which a solid transforms into a liquid at atmospheric pressure is referred to as the liquid’s melting point.

The fact that water boils at a greater temperature than fluorine makes option C the correct choice. The melting point of water is zero degrees Celsius (32 degrees F). Depending on the atmospheric pressure, different amounts of water will boil at different temperatures. When purified water reaches its boiling point at sea level, it does so at 212 degrees Fahrenheit (100 degrees Celsius).

Compared to fluorine, water has a greater boiling point. Regarding the melting and boiling points of water and fluorine molecules, this statement is accurate.

The temperature at which a substance's solid and liquid phases are in equilibrium is known as its melting point. A temperature at which a substance's vapour pressure reaches its boiling point.

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Statement C; They are 0°F and 100°F, respectively, correctly describes the melting and boiling points of water. But Instead of F it should be degree Celsius.

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Answer:

The ion-electron method involves breaking the reactants into their component ions and transferring electrons between the ions to balance the charge and the atoms. In a basic solution, the S²⁰⁸² ion will gain two electrons to form SO₂. The I¹⁻ ion will lose one electron to form I³⁻. The balanced redox equation using the ion-electron method is:

S²⁰⁸² + 2e⁻ + 2OH⁻ → SO₂ + H₂O

I¹⁻ + e⁻ → I³⁻

The overall balanced equation is:

2S²⁰⁸² + 2OH⁻ + I¹⁻ → 2I³⁻ + SO₂ + H₂O

Answer:

:) Here

Explanation:

1.3 mol ⋅ L − 1

Molarity=

Moles of solute/ Volume of solution

Answer:

The key difference between indicator electrode and reference electrode is that indicator electrode responds to changes in the activity of the analyte, whereas reference electrode does not respond to changes, and its response is stable.

Explanation:

A bond between 2 atoms as being covalent an electronegativity difference of greater than 1.7 between the atoms.

Bond is a debt instrument, which is issued by governments and corporations. These bonds are used to raise capital for various projects and investments. Bonds are a form of loan and investors are usually paid a fixed interest rate for lending their money. Bonds are typically issued for a fixed period of time, usually for a period of 5-30 years, and have a fixed maturity date. Investors receive interest payments at regular intervals and receive the principal amount of the bond at the end of the period.

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Answer:

257.6 grams

Explanation:

first write the formula: 4Fe + 3O2 -> 2Fe2O3

Fe molar mass is 55.8

180/55.8 = 3.226 mols

devide 3.226 by 4, then multiply by 2 which gives us 1.61 mols Fe2O3

Fe2O3 molar mass is 160

1.61 mols * 160 = 257.6 grams

Answer:

The chemical change is "Frying an egg".

Explanation:

Thus the above is the right answer.

Answer:

The minimum amount of NaOH(aq) solution needed to add is 0.0560 L. This can be calculated by using the following equation:

Moles of Cd2+ = 0.0220 M x 0.300 L = 0.0066 mol

Moles of NaOH = 0.0066 mol x 2 = 0.0132 mol

Volume of NaOH = 0.0132 mol/1.25 M = 0.0560 L

Explanation:

Answer:

entire, increasing, decreasing

Explanation:

The EM Spectrum is the entire range of EM waves in order of increasing frequency and decreasing wavelength.

The pH value of 500 mL of an aqueous solution of 0.005 mole HCl is 2

We'll begin our calculations by obtaining the molarity of the solution. Details below:

Molarity = mole / volume

Molarity = 0.005 / 0.50

Molarity = 0.01 M

Next, we shall obtain the concentration of the hydrogen ion, H⁺ in the solution. Details below:

HCl(aq) <=> H⁺(aq) + Cl¯(aq)

From the balanced equation above,

1 mole of HCl contains 1 mole of H⁺

Therefore,

0.01 M HCl will also contain 0.01 M H⁺

Thus, the concentration of the hydrogen ion, H⁺ in the solution is 0.01 M

Finally, we shall determine the pH of the solution. Details below:

pH = -Log H⁺

pH = -Log 0.01

pH = 2

Thus, we can conclude that the pH of the solution is 2

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The lower bond energy of the silicanes make them more reactive than the alkanes.

We know that the members of group four has the ability to catenate and this is a property that characterizes all the elements that we can find in the group. However the extent to which the members of the group can be able to catenate is what we use to determine the stability of the bonds.

The alkanes are composed of the bonds that exist between carbon and hydrogen and the alkanes can be able to form very long chains and this can be used to explain the fact that you can be able to find the alkanes in various kinds of applications.

However, the bond energy of the silicanes is less than that of the alkanes hence they tend to be more reactive  then the alkanes.

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Answer:

om pH

The hydronium ion concentration can be found from the pH by the reverse of the mathematical operation employed to find the pH. [H3O+] = 10-pH or [H3O+] = antilog (- pH) Example: What is the hydronium ion concentration in a solution that has a pH of 8.34?

Explanation: