Which of the following is true regarding the atoms involved in a chemical reaction? OPTIONS The same number of each type of atom will always be present before and after a chemical reaction takes place. Some of the atoms present before the reaction will always be lost during a chemical reaction. Some of the atoms will always be changed into a different type of atom by a chemical reaction. During a chemical reaction, atoms will always be combined into much larger molecules.

Explanation:

2,6-Dibromo-4-isopropylphenol

2432-16-8

2,6-dibromo-4-propan-2-ylphenol

Phenol, 2,6-dibromo-4-(1-methylethyl)-

4-isopropyl-2,6-dibromophenol

Answer:

Gold has a high conductivity

Explanation:

This is because gold is a metal that occur free in nature in rocks, alluvial , grains e.t.c. it is a transition metal and in group 11 of the periodic table do it conduct electricity. It has has conductivity because it is a metals because all metals have ability to conduct electricity. When it is pure, it is a bright, slightly reddish yellow, . It is soft, malleable.

It is a ductile metal

and ductile metal.

Answer:GOLDDDDD

Explanation:

Answer:

how to rapidly separate red#40 from ZnO

Red #40 is soluble in water while zinc oxide is not. 4- heat the solution of red #40 and water until water evaporates and red#40 remains

hope it's help

Answer:

B

Explanation:

"The temperature increases cause the rate of a reaction to increases the kinetic energy"

What is rate of reaction?

The reaction rate, also known as the rate of reaction, is the rate for which a chemical reaction occurs, and is proportional to increase in product concentration per unit time and the reduction in reactant concentration per unit time. The rate of reaction varies greatly.

What is kinetic energy?

An object's kinetic energy is the energy it has as a result of its motion. It is the amount of work required to push a body of a given mass from rest to a certain velocity. The body keeps its kinetic energy gained during acceleration unless that speed changes.

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Answer:

New temperature T2 = -124.7 °C

Explanation:

Given:

Old volume V1 = 135 cm³

New volume V2 = 140 cm³3

Old temperature T1 = 143 K

Find:

New temperature T2

Computation:

V1 / T1 = V2 / T2

135 / 143 = 140 / T2

New temperature T2 = 148.3 K

New temperature T2 = 148.3 - 273

New temperature T2 = -124.7 °C

Answer:

0.415 j/g°C

Explanation:

Given that :

Mass of water, m1= 250.0 g

Temperature of water, T1= 25°C

Specific heat capacity of water, C= 4.184 J/g°C

Mass of brass , m2= 51.1g

Temperature of brass = 95.4°C

Specific heat capacity of brass , c2=?

Final temperature = 26.4°C

Heat lost by brass = Heat gained by water

mc(dT) = mc(dT)

51.1 * c * (95.4 - 26.4) = 250 * 4.184 * (26.4 - 25)

51.1 * 69 * c = 250 * 4.184 * 1.4

3525.9c = 1464.4

c = 1464.4 / 3525.9

c = 0.4153265

c = 0.415 j/g°C

Specific heat capacity of Brass for the experiment = 0.415 j/g°C

Answer:

1.01atm is the pressure of the gas

Explanation:

The difference in heights in the two sides is because of the difference in  pressure of the enclosed gas and the atmospheric pressure. This difference is in mm of the nonvolatile liquid. The difference in mm Hg is:

32.3mm * (0.993g/mL / 13.6g/mL) = 2.36mmHg

As atmospheric pressure is 765mm Hg and assuming the gas has more pressure than the atmospheric pressure (There is no illustration), the pressure of the gas is:

765mm Hg + 2.36mm Hg = 767.36 mmHg

In atm:

767.36 mmHg * (1atm / 760 mmHg) =

1.01atm is the pressure of the gas

Given:

Now,

The density of Hg will be:

= [tex]\frac{13.6}{0.791}[/tex]

= [tex]17.2 \ mm[/tex]

then,

= [tex]32.3\times (\frac{1 \ mm \ Hg}{17.2} )[/tex]

= [tex]18.73 \ mm \ Hg[/tex]

hence,

The pressure will be:

= [tex]765-18.73[/tex]

= [tex]746.27 \ mm \ Hg[/tex]

= [tex]0.993 \ atm[/tex]

Thus the above answer is right.

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Answer:

Lime water Ca(OH)2 is a base

Potassium oxide K2O is a basic oxide

Copper sulphate CuSO4 is a salt

And vinegar is an acid

Explanation:

Answer:

Molecular formula: S4K8O16  empirical formula: SK2O4

Explanation:

First we find the moles of each by first finding grams (using the percent) and then using stoichiometry to convert into moles:

Sulfur: 696 *.18 = 125.28grams S* [tex]\frac{1 mole S}{32.065 g S} = 3.907 moles S[/tex]

Potassium: 696 *.4487 = 312.2952 *[tex]\frac{1 mole K}{39.08 g K}[/tex]= 7.99117 mole K

Oxygen: 696 * .367 = 255.432 * [tex]\frac{1 mol O}{16g O}[/tex] = 15.9654 mole O

Then we divide each value by the atom with the smallest number of moles to find the mole ratio:

3.907/3.907= 1

7.99117 mole K/ 3.907= 2.043

15.9654 mole O/ 3.907= 4.08

The empirical formula is SK2O4

To find the molecular formula, we divide the mass given (696) by the mass of the empirical formula (174.22) to get 4. We then divide each atom by 4.

Molecular formula: S4K8O16

Answer:

Distillation columns are used to separate mixed feed streams into their own distinct products.

Explanation:

The primary function of the distillation column is to separate the feed stream into (at least) one highest level product stream and one bottom product stream. The performance of the column separation can be justified by the purity of the upper and lower product streams.

Answer:

rocket fuel burning i think

Answer:

1)4180j

2)15000kj

Explanation:

[tex]1) E=100*(30-20)*4.18=4180j\\2)Q=.5*30*1000=15000kj[/tex]

Answer:

A) The reaction is an exothermic reaction

B) 12.744 kJ

c) 49.976 KJ/mol . NaOH

Explanation:

A)  The reaction is an exothermic reaction

B) calculate the amount of heat that was released or absorbed by the reaction in this case. kJ

Assuming : specific heat of solution = specific heat of water = 4.186 J/g°C

mass of solution = 10.2 + 250 = 260.2 g

determine The heat released in the reaction

= mass of solution * specific heat of solution * temperature change

= 260.2 * 4.186 * ( 32.7 - 21 )

= 12.744 kJ

C) Calculate the reaction enthalpy ΔH per mole of NaOH. mol

Reaction enthalpy = - heat released / ( 10.2 /40 )

                               =  - 12.744 / ( 10.2/40 ) =  - 49.976 KJ/mol . NaOH

Answer:

0.0723371390261859

Answer:

The answer is A, I think.

Answer:

the answer is A

Explanation:

The human eye and brain together translate light into color. Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. Newton observed that color is not inherent in objects. Rather, the surface of an object reflects some colors and absorbs all the others.

Answer:

balancing the equation?

Answer:

B carbon

Explanation:

guessed

Answer:

The ball exerts an equal and opposite force on the bat. This is the reaction force. Such an interaction pair is another example of Newton's Third Law. The baseball forces the bat in one direction and the bat forces the ball in the opposite direction.

Answer:

the work done on the gas is 4,988.7 J.

Explanation:

Given;

number of moles of the monoatomic gas, n = 4 moles

initial temperature of the gas, T₁ = 300 K

final temperature of the gas, T₂ = 400 K

The work done on the gas is calculated as;

[tex]W = \Delta U = nC_v(T_2 -T_1)[/tex]

For monoatomic ideal gas: [tex]C_v = \frac{3}{2} R[/tex]

[tex]W = \frac{3}{2} R \times n(T_2-T_1)[/tex]

Where;

R is ideal gas constant = 8.3145 J/K.mol

[tex]W = \frac{3}{2} R \times n(T_2-T_1) \\\\W = \frac{3}{2} (8.3145) \times 4(400-300) \\\\W = \frac{3}{2} (8.3145) \times 4(100)\\\\W = 4,988.7 \ J[/tex]

Therefore, the work done on the gas is 4,988.7 J.

Answer:

oh ok

Explanation:

Answer:

t = 1862 s

Explanation:

To do this, we need first to determine the theorical detention time, which can be determined with the following expression:

t₀ = ∀/Q  (1)

Where:

t₀: detention time

∀: Volume of the fluid in the reactor

Q: Flow rate in the reactor

With this time, we must use the following expression to determine the time that the workers will take to vent the tank:

C = C₀ e^(-t/t₀)   (2)

From here, we must solve for time t, and the expression will be:

t = ln(C₀/C) * t₀   (3)

Now that we know the expression to use, let's solve for t. Using (1) to determine the detention time, ∀ is 1900 m³, and Q is 2.35 m³/s so:

t₀ = 1900 / 2.35 = 808.51 s

Now, let's solve for the time t. C will be 0.0015 mg/L (or 1.5 mg/m³ cause in 1 m³ we have 1000 L) and C₀ 15 mg/m³:

t = ln(15/1.5) * 808.51

Hope this helps

Answer:

c

Explanation:

[tex]\displaystyle 6 \ mol \ N_2[/tex]

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced] N₂ + 3H₂ → 2NH₃

[Given] 12 mol NH₃

[Solve] x mol N₂

Step 2: Identify Conversions

[RxN] 1 mol N₂ → 2 mol NH₃

Step 3: Stoich

Answer:

[tex]\boxed {\boxed {\sf 6 \ moles \ of \ N_2}}[/tex]

Explanation:

1. Balance Equation

We are given the reaction:

[tex]1 N_2+3H_2 \rightarrow 2 NH_3[/tex]

The equation is already balanced. Both sides have 2 moles of nitrogen and 6 moles of hydrogen.

2. Conversions

In this reaction, 1 mole of nitrogen produces 2 moles of nitrogen tryhdride:

[tex]1 \ mol \ N_2 \rightarrow 2 \ mol \ NH_3[/tex]

3. Stoichiometry Calculations

Use the conversion rate as a fraction.

[tex]\frac{ 1 \ mol \ N_2}{2 \ mol \ NH_3}[/tex]

Multiply the number of moles of nitrogen trihydride produced: 12 moles.

[tex]12 \ mol \ NH_3 *\frac{ 1 \ mol \ N_2}{2 \ mol \ NH_3}[/tex]

The moles of nitrogen trihydride cancel.

[tex]12 *\frac{ 1 \ mol \ N_2}{2} = \frac{ 12 \ mol \ N_2}{2}[/tex]

[tex]6 \ mol \ N_2[/tex]

6 moles of nitrogen are needed to produce 12 moles of nitrogen trihydride.

Answer:

Number three, because precipitation is rain, which comes from cumulonimbus clouds. Precipitation happens when clouds have accumulated enough evaporated water for the cloud to get heavy and need to get rid of some of the water, which it does through condensing the water and then delivering it as rain.

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Answer:

3

Step-by-step explanation:

Hence, the given number has 3 significant figures.

Answer:

answer is the 4th one

Explanation:

The type of changes one might  expect as one  goes down from the ocean's surface to its bottom is that temperature and light decrease; pressure and density increase.

Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.

There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .

It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.

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Answer:

A. In a polar molecule, the bond is polar covalent. That is, the electrons are shared but are slightly more attracted to the more electronegative atom. That part of the molecule has a negative partial charge density, and the other has a positive partial charge density (there is no symmetry in the distribution of the electricity density)

B. Charges are not affected, the molecule is neutral because electrons are shared. A molecule has the same number of electrons and protons which balance the charges in a molecule. Since all atoms are electrically neutral, then when they combine the form of a neutral molecule.

Explanation:

To determine polarity, the geometry of the molecule must be taken into account to determine the distribution of atoms and their electronegativity (tendency to attract electrons) to determine to which points of the molecule the electrons will be most attracted.

Atoms can share electrons to form chemical bonds and thus form different compounds. In the case of non-polar molecules, when formed in a covalent bond (two atoms bond by sharing valence electrons reaching "stable octet") between equal atoms, the molecule is neutral since it has zero electric charge. In this type of bond there is no change in the oxidation number of the atoms because their shared electrons are equidistant. Covalent bonds in which the electrons are shared equally are called non-polar covalent bonds. This is because the atoms are just the same, they have the same electronegativity, so they "attract" the electrons with the same force and the electrons surround the atoms equally. The charge density distribution is the same for both, there is asymmetry in the distribution of it.

Polar molecules are formed when bonds are formed by different atoms with large differences in electronegativity. The molecule is electrically neutral as a whole because it has an equal number of positive and negative particles, but there is no symmetry in the distribution of the electricity density. A polar bond is one in which a pair of electrons is more attracted to one of the atoms. This causes one end of the molecule to acquire a positive partial charge density and the other end of the molecule to acquire a positive partial charge density and the other end of the molecule to acquire a negative partial charge.

So, as a summary:

A. In a polar molecule, the bond is polar covalent. That is, the electrons are shared but are slightly more attracted to the more electronegative atom. That part of the molecule has a negative partial charge density, and the other has a positive partial charge density (there is no symmetry in the distribution of the electricity density)

B. Charges are not affected, the molecule is neutral because electrons are shared. A molecule has the same number of electrons and protons which balance the charges in a molecule. Since all atoms are electrically neutral, then when they combine the form of a neutral molecule. Only ions do not have a neutral electrical charge because of the process of gaining or losing electrons. An ion with a positive electrical charge is called a cation, and an ion with a negative electrical charge is called an anion.

Answer:

a) 6.3 cm

b) 8.0 cm

c) 0.7875

Explanation:

(a) The compound has moved above upto 7.3 cm from the bottom of the paper. Let us assume that line is drawn at 1.0 cm mark as the origin of spot. \

Distance traversed by compound= 7.3 - 1.0 cm = 6.3 cm

(b) Distance traversed by the solvent = 9.0 - 1.0 cm = 8.0 cm

(c) The Rf = Compound Migration distance / Solvent front migration distance

                      = 6.3/8.0 = 0.7875