A chemistry graduate student is studying the rate of this reaction:
NH4OH(aq)→NH3(aq)+H2O(aq)
She fills a reaction vessel with and measures its concentration as the reaction
proceeds: time (seconds).
1. Write the rate law for this reaction.
2. Calculate the value of the rate constant.

Answer:

Hydrogen, lithium, sodium, and potassium all have 1 valence electron ( an electron in the outermost energy level is a valence electron).

A volcano can be defined as an opening on the surface of a planet that allows material warmer than surroundings to escape from its interior. Therefore, option (B) is correct.

A volcano can be described as an opening in the earth's crust through which lava, volcanic ash, and gases escape from its interior. When this material escapes, then eruptions can be calmer, with gentle flows of material, or can be explosive, sending material high into the sky.

When pieces of Earth's crust slowly move away from each other, magma can rise. The magma rises to fill in space and underwater volcanoes can form.

The tectonic plates can also move toward each other when magma rises. The part of Earth's crust can be forced deep into its interior which can cause the crust to melt and rise as magma.

The magma can also rise over hot spots. Hot spots can be defined as the hot areas inside of Earth where magma heats up and becomes less dense. With each way of rising the magma can form volcanoes.

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The values of N, log N and ln N are all worked out below.

We have the number N as 8.99

hence;

1) lnN = ln(8.99) = 2.196

log N = log (8.99) = 0.954

2) If we have ln N as 3.949

N = e^3.949 = 51.88

So;

log N = log (51.88) = 1.715

3) log N = 0.134

N = Antilog (0.134 ) = 1.36

ln N = ln (1.36) = 0.307

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Answer:

2 Na atoms

1 C atom

3 O atoms

gram formula weight = 105.99 g

hope this helped :)

Explanation:

→ Na

# of Atoms - 2

→ C

# of Atoms - 1

→ O

# of Atoms - 3

→ gram formula weight (g) : 105.99 g

Answer:

\(\boxed{\boxed {\sf 5930.0 \ mol \ CH_4}}\)

Explanation:

We are asked to find how many moles of methane (CH₄)  a cow produces in a year. We must convert molecules of methane to moles of methane. We will do this using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance.

In this case, the particles are molecules of methane. There are 6.022 × 10²³ molecules of methane in 1 mole.

We will convert molecules to moles using dimensional analysis. Set up a ratio using Avogadro's Number.

\(\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}\)

We are converting 3.571 × 10²⁷ molecules of methane to moles, so we multiply the ratio by this value.

\(3.571 \times 10^ {27} \ molecules \ CH_4 *\frac {6.022 \times 10^{23} \ molecules \ CH_4}{ 1 \ mol \ CH_4}\)

Flip the ratio. It is still the same value, but the units of molecules of methane cancel.

\(3.571 \times 10^ {27} \ molecules \ CH_4 *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} \ molecules \ CH_4}\)

\(3.571 \times 10^ {27} *\frac { 1 \ mol \ CH_4}{6.022 \times 10^{23} }\)

\(\frac {3.571 \times 10^ {27}}{6.022 \times 10^{23} } \ mol \ CH_4\)

\(5929.923613 \ mol \ CH_4\)

The original measurement of molecules of methane( 3.571 × 10²⁷ molecules) has 4 significant figures, so our answer must have the same. For the number we calculated, that is the ones place. The 9 in the tenth place tells us to round the 9 in the ones place up to a 0, then the 2 in the tens place up to a 3.

\(5930 \ mol \ CH_4\)

We must add a placeholder zero in the tenth place to reach 4 sig figs.

\(5930.0 \ mol \ CH_4\)

The adult cow produces approximately 5930.0 moles of methane in a year.

Answer:

see explanations

Explanation:

a. The central atom bonded to four substituent atoms and having no lone pair.

This is an AX₄ geometry => tetrahedron

b. The central atom bonded to three substituent atoms and having one lone pair.

This is an AX₃E geometry => pyramidal

c. The central atom bonded to two substituent atoms ảnd having

one lone pair.

This is an AX₂E geometry => bent angular

d. The central atom bonded to two substituent atoms and having no lone pair.

This is an AX₂ geometry => linear

_______________________________

Based upon the VSEPR Theory there are 6 parent geometry configurations and associated derived geometries.

Parent geometries  => Derivatives => Examples

For graphic images of each geometry do an internet search for 'molecular geometry'.

The necessary conditions when proving that the opposite angles of a parallelogram are congruent are: A. Opposite sides are congruent. D. Corresponding parts of congruent triangles are congruent.

Opposite sides are congruent as this property of parallelograms is known as the opposite sides property. It states that opposite sides of a parallelogram are equal in length. By showing that the opposite sides of a given parallelogram are congruent, we can establish that the figure is indeed a parallelogram.  Corresponding parts of congruent triangles are congruent, as this property is based on the concept of congruent triangles. If we can prove that two triangles within a parallelogram are congruent, then the corresponding parts of those triangles, including angles, will also be congruent.

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Answer:

hshssytdtctdyeheb

Explanation:

yye6d66d6d6dududyydydydyehwj2

Answer:

What are the properties of the aluminum in the can? Check all that apply.

*It conducts electricity well.

*It is solid.

It is brittle.

*It does not react easily with water or air.

It is less dense than water.

Explanation:

a b d

The properties of aluminium (Al) includes electrical conductivity, solid and it does not react easily with water. Therefore, option A, B and D are correct.

Aluminium is a common metal we use day to day. It is an electropositive element and due to its metallic nature, Al shows electrical and thermal conductivity. Unlike other metals Al can withstand brittleness and it is ductile in nature.

Aluminium easily reacts with oxygen and forms an oxide layer on its surface so that, it can resist attack by other chemical such as acid or bases as well as oil and water. Hence water does not easily react with aluminium.

Therefore, we can say that aluminium is a solid which conduct electricity and not easily reacts with water.

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The two atoms are isotopes of each other are Si with a mass number of 27 and an atomic number 14, and Mg with a mass number of 25 and an atomic number of 12. The correct option is A.

Isotopes are atoms with the same number of protons but differing numbers of neutrons.

They differ in mass, which affects their physical characteristics even if they have nearly identical chemical properties.

An isotope is one of two or more chemical elements that exist in different forms. Varied isotopes of an element share the same atomic number and protons in their nuclei, giving them the same atomic weight.

However, each elemental isotope has a different amount of neutrons, which changes its atomic weight.

They can be referred to as isotopes because Si, which has a mass number of 27 and an atomic number of 14, and Mg, which has a mass number of 25 and an atomic number of 12, both have 13 protons.

Thus, the correct option is A.

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Answer:

adding dec. is very smilar to adding whole numbers

By performing the calculations and comparing the F-value to the critical F-value, we can determine whether the variance of the Gravimetric method differs significantly from that of the Volumetric method in the analysis of iron in sample A.

To determine if there is a significant difference between the variances of the Gravimetric and Volumetric methods used to determine iron in sample A, we can employ the F-test, also known as Fisher's F-test or the variance ratio test. The F-test compares the ratio of the variances to assess if there is a statistically significant difference.

Let's denote the Gravimetric method as Group 1 and the Volumetric method as Group 2. The first step is to calculate the variances for each group.

For Group 1 (Gravimetric):

Variance_1 = [(13.0-13.1)^2 + (13.5-13.1)^2 + (13.3-13.1)^2 + (12.9-13.1)^2 + (15.1-13.1)^2 + (13.3-13.1)^2 + (12.7-13.1)^2 + (12.6-13.1)^2 + (13.1-13.1)^2] / (n-1)

For Group 2 (Volumetric):

Variance_2 = Calculate the variance in the same manner for the data obtained from the Volumetric method.

Once we have the variances, we can calculate the F-value using the formula:

F = Variance_1 / Variance_2

Next, we need to compare this F-value with the critical F-value at a chosen significance level (usually α = 0.05 or 0.01) and degrees of freedom for each group (df_1 and df_2).

If the calculated F-value is greater than the critical F-value, it indicates a significant difference between the variances of the two methods. Conversely, if the calculated F-value is less than the critical F-value, there is no significant difference in the variances.

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Answer:

pH = 3.37

Explanation:

A weak acid as lactic acid in a solution with sodium lactate (Its conjugate base) produce a buffer. The pH of this buffer is obtained using H-H equation:

pH = pKa + log [A-] / [HA]

Where pH is the pH of the buffer,

pKa is 3.86

And [] could be taken as the moles of A- = Sodium lactate and HA = Lactic acid.

Moles A-:

40.0mL = 0.0400L * (0.75mol / L) = 0.030 moles A-

Moles HA:

75.0mL = 0.0750L * (1.25mol / L) = 0.09375 moles HA

Replacing:

pH = 3.86+ log [0.030 moles A-] / [0.09375 moles HA]

You can see that in the reactants, we have 1 atom of Cu and 2 atoms of oxygen, but in the products we just have 1 atom of Cu and 1 atom of oxygen, so we can balance the equation doing the trial and error method.

We can put '2' moles beside the product (CuO) to balance the oxygen, and we're going to have 2 oxygens, but Cu is not balanced, so we need to put '2' moles beside Cu in the reactants, and the balanced equation would be:

2Cu + O2 -> 2CuO.

Each person should choose 6 items from Column A and 4 items from Column B, ensuring that everyone orders the same number of items from each column. Option B

To divide the items evenly among four people while ensuring that each person orders the same number of items from each column, we need to find the common divisor of the number of items in each column.

Column A has 24 items, and Column B has 16 items. The common divisor of 24 and 16 is 8. Therefore, each person should choose 8 items.

Since there are 24 items in Column A, and each person needs to choose 8 items, the answer is 24 divided by 8, which equals 3. Each person should choose 3 items from Column A.

Similarly, since there are 16 items in Column B, and each person needs to choose 8 items, the answer is 16 divided by 8, which equals 2. Each person should choose 2 items from Column B.

Therefore, the correct answer is:

B) 6 from A, 4 from B

Each person should choose 6 items from Column A and 4 items from Column B, ensuring that everyone orders the same number of items from each column.

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Inter-conversion of glucose and fructose occurs with an equilibrium constant of 1.0. Glucose isomerase catalyzes this reaction. The final concentration of fructose at equilibrium from 40mM glucose is a. 40 mM.

Using this formula to find the  final concentration of fructose

Final concentration of fructose  =Equilibrium from glucose/ Equilibrium constant

Where:

Equilibrium constant = 1.0

Equilibrium from glucose = 40 mM

Let plug in the formula

Final concentration of fructose  = 40mM / 1.0

Final concentration of fructose  =  40mM

Therefore we can conclude that the correct option is A.

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The complete question is:

Inter-conversion of glucose and fructose occurs with an equilibrium constant of 1.0. Glucose isomerase catalyzes this reaction. The final concentration of fructose at equilibrium from 40mM glucose is

a. 40 mM

b. 20 mM

c. 10 mM

d. 0 mM​

The heat capacity for the metals are;

Aluminum -  0.89

Copper - 0.11

Iron - 0.44

Lead - 0.12

The specific heat of a substance is denoted by the symbol "C" and is typically measured in units of J/g·°C (joules per gram per degree Celsius) or cal/g·°C (calories per gram per degree Celsius).

The specific h

We have that;

For Aluminum;

c = 4.184 * 39.85 * 4.7/11.98 * 72.9

= 783.6/873.3

= 0.89

For Copper;

c =  4.184 * 12.14 * 1.9/12.14 * 75.4

= 96.5/915.3

= 0.11

For Iron

c =  4.184 * 40.24 * 2.4/12.31 * 75.1

= 404.1/924.5

= 0.44

For Lead

c = 4.184 * 39.65 * 0.7/12.46 * 76.7

c = 116.1/955.68

= 0.12

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Answer:

Isomers that contain the same number of atoms of each kind but differ in which atoms are bonded to one another are called structural isomers, which differ in structure or bond type. For inorganic complexes, there are three types of structural isomers: ionization, coordination and linkage.

Answer:

Explanation:

Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it. ... Covalent bonds form when sharing atoms results in the highest stability. Other types of bonds besides ionic and covalent chemical bonds exist, too.

Answer:

Carbon, silicon, and germanium share many chemical properties because they belong to the same group in the periodic table, which is group 14 (also known as the carbon group). The elements in this group have the same number of valence electrons (4), which gives them similar chemical properties.

The correct option is: They have the same number of valence electrons (4), which gives them similar chemical properties.

Explanation:

The dependent variable in the information regarding the cattles is D. Temperature of Cattle.

A dependent variable is one that is altered as a result of the modification of an independent variable. Your independent variable "depends" on the outcome you're interested in measuring. Dependent variables are also known as response variables in statistics (they respond to a change in another variable)

It is something on which other elements depend. For instance, a test result might be a dependent variable because it depends on a number of variables, including how much you studied.

In this case, one will measure the temperature of the cattle to see whether or not it works. This is the dependent variable.

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You are managing a large lot of cattle. A pharmaceutical company wants you to try a new antibiotic to treat Shipping Fever in newly arrived cattle. The company claims that it is less expensive and more effective than the current antibiotic you are using. You will measure the temperature of the cattle to see whether or not it works. WHAT IS THE DEPENDENT VARIABLE (DV)?

Type of cow

Antibiotic

No Antibiotic

Temperature of Cattle

Answer: 6.23

Explanation:

1) solve for pH  

pH=-log (H3O+) = - log 1.7 X 10^-8 =7.77

2) now do 14-pH  = 14 -7.77=6.23

Answer:  Two cold air masses surround a warm air mass during a warm front, but a cold air mass moves against a warm air mass during an occluded front.

Explanation:

Sulphur dichloride has higher boiling point as compare to sulphur hexafluoride because

Sulphur dichloride has stronger intermolecular forces among the molecules and sulphur hexafluoride has weaker intermolecular forces among molecules.

Stronger the intermolecular forces higher the boiling point that the reason sulphur dichloride has a higher boiling point than the sulphur hexafluoride.

Answer:

The pressure of a gas is directly proportional to its Kelvin temperature if the volume is kept constant. At constant volume and temperature, the total pressure exerted by a mixture of gases is equal to the sum of the partial pressures of the component gases.

Explanation:

Answer: The size of the orbital is determined by the principal quantum number, so the size of the orbital increases as this value increases. Therefore, an electron in a (n-1) orbital is closer to the nucleus than is an electron in a 'n' orbital.

Explanation:

In an atom, the position and energy of an electron is described by a set of numbers and these sets are called quantum numbers.  

There are four quantum numbers. These are as follows.

1). Principal quantum number - This is denoted by "n" and it determines the size and energy of shell in which electron is present. The value of "n" can be 1, 2, 3, and so on but it can never be equal to zero.

2). Azimuthal quantum number - This is denoted by "l" and it determines the shape of an orbital. For s, p, d and f-shell the values of "n" will be 0, 1, 2, 3. The value of l can vary from -n to +n.

3). Magnetic quantum number - This is denoted by "\(m_{l}\)." and it determines the orientation of an orbital. The value of ml can vary from -l to +l.

4). Spin quantum number -- This is denoted by "\(m_{s}\)" and it determines the spin of an electron. It is independent of the values of n, l and \(m_{l}\).

This means that the size of an orbital is determined by principal quantum number. Lower is the value of 'n' (principal quantum number) more closer will be an electron to the nucleus. Hence, more is the value of 'n' more will be the size of nucleus and vice-versa.

For example, an electron present in a 2s-orbital is closer to the nucleus as compared to the electron present in a 3s-orbital.

Thus, we can conclude that the size of the orbital is determined by the principal quantum number, so the size of the orbital increases as this value increases. Therefore, an electron in a (n-1) orbital is closer to the nucleus than is an electron in a 'n' orbital.

The ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)).

Aluminum (Al) typically has an atomic number of 13, which means it has 13 protons and 13 electrons in its neutral state. However, in the given ion, \(Al^{3+}\), the ion has lost three electrons, resulting in a +3 charge. This means that the ion now has 13 protons and only 10 electrons remaining, giving it a net positive charge of +3.

The atomic mass of aluminum is 26.98 atomic mass units (amu). The given ion has an atomic mass of 71 amu, which suggests that the ion has gained additional particles. In this case, the ion has also gained three neutrons, resulting in a higher atomic mass.

The total number of particles (protons, neutrons, and electrons) in the ion can be calculated by adding the number of protons (13) and the number of neutrons (3), which equals 16. Since the ion has a net charge of +3, it only contains 10 electrons.

In summary, the ion with a +3 charge, 28 electrons, and an atomic mass of 71 is the aluminum ion (\(Al^{3+}\)), which has 13 protons, 10 electrons, and 3 neutrons.

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Using a water filtration device requires significant modifications to scale up the technology, as well as the inclusion of pre-treatment, multiple stages of filtration, and maintenance systems.

A water filtration device is designed to remove impurities and contaminants from water, such as suspended solids, bacteria, viruses, and chemicals. Such devices can range from small household filters to large-scale treatment plants.

To use a water filtration device for large-scale water filtration, several modifications would be necessary, such as:

Scaling up the device: A large-scale water filtration device would need to be much larger than a household filter, to handle the volume of water that needs to be treated.

Pre-treatment: Large-scale filtration systems typically require pre-treatment to remove large particles and debris before the water enters the filtration system.

Multiple stages of filtration: For effective removal of a wide range of contaminants, multiple stages of filtration may be required.

Backwash and maintenance: Large-scale water filtration systems require regular maintenance, including backwashing to remove accumulated debris and contaminants from the filtration media.

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