Which of the following is considered a form of technology?
Select one:
a. A line of thought used to explain logically what happened in an experiment.
b. A beaker used in an experiment.
C. A series of procedures followed in an experiment.
d. The ethical practice of considering human and animal rights in research studies.

Answer:

-176.0 kJ/mol

Explanation:

Let's consider the following balanced reaction.

NH₃(g) + HCl(g) → NH₄Cl(s)

We can calculate the standard enthalpy change for the reaction (ΔH°rxn) using the following expression.

ΔH°rxn = 1 mol × ΔH°f(NH₄Cl(s)) - 1 mol × ΔH°f(NH₃(g)) - 1 mol × ΔH°f(HCl(g))

ΔH°rxn = 1 mol × (-314.4 kJ/mol) - 1 mol × (-46.1 kJ/mol) - 1 mol × (-92.3 kJ/mol)

ΔH°rxn = -176.0 kJ/mol

Answer:

D) sodium t-butoxide + bromomethane

Explanation:

The alkoxide ion is a strong nucleophile, that unlike alcohols, will react with primary alkyl halides to form ether. This general reaction is known as the Williamson synthesis, and is a SN₂ displacement. The alkyl halide must be primary so the back side attack is not hindered, and the alkoxide ion must be formed with the most hindered group.

The mechanism can be seen in the attachment.

The reaction of sodium t-butoxide and bromomethane gives the higher yield. Thus, option D is correct.

For the production of t-butyl methyl ether in higher yield, there has been the Williamson ether synthesis. The synthesis has been carried out with the reaction of alkylhalide with the alkoxide, that results in the formation of an ether.

The Williamson reaction has been a SN2 reaction that has been carried out in two steps with the addition of nucleophile and removal of the halide for the formation of ether.

From the given reactants, the higher yield has been obtained with the reaction of alkoxide and alkyl halide. Thus, reaction of sodium t-butoxide and bromomethane gives the higher yield. Thus, option D is correct.

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Answer:

[tex]m_{Deu}=2666.7g[/tex]

Explanation:

Hello,

In this case, we can apply the following mole-mass-density relationship in order to compute the required grams of deuterium, considering that it is the 0.0150% (molar basis) of natural hydrogen (H₂):

[tex]m_{Deu}=80000LH_2O*\frac{1000gH_2O}{1LH_2O}*\frac{1molH_2O}{18gH_2O} *\frac{1molH_2}{1molH_2O} *\frac{2gH_2}{1molH_2} *\frac{2*0.0150g\ Deu}{100gH_2} \\\\m_{Deu}=2666.7g[/tex]

Best regards.

Answer:

Amino acids, along with glucose, are reabsorbed in the glomerular system with a passive or active mechanism as the fluid travels through the entire renal tubular system and enters the circulation again.

Active mechanisms are those that require expenditure of energy, that is, expenditure of the energy currency, while the passive ones do not, they occur through spontaneous non-energy processes such as osmosis, the osmotic gradient and the difference in concentrations in different compartments.

Explanation:

Glomerular filtration is the regulator of the excretion of metabolites and toxic molecules or not necessary for our body. That is why if the amino acid values ​​are high as well as those of glucose in urine, we will be facing a pathology.

If glucose is increased, it is because there is a glycemic peak in blood volume, hence possible diabetes.

And if the amino acids are increased, we could be facing an autoimmune or proteolytic pathology where a large amount of body proteins such as muscle proteins would be breaking down and releasing the amino acids that make it up, this phenomenon usually appears in those people who suffer from rhabdomyolysis in expenses very intense energy sources not appropriate.

On the other hand, glomerular filtration occurs in the kidney and is carried out by the nephron, which is the functional unit of the kidney, within it there is a specific tubular system in collection, absorption and reabsorption, added to the presence of Bowman's capsule.

Answer:

115 g

Explanation:

Step 1: Given data

Step 2: Calculate the moles of glucose

The molarity is equal to the moles of solute divided by the liters of solution.

M = moles of glucose / liters of solution

moles of glucose = M × liters of solution

moles of glucose = 0.318 mol/L × 2.00 L

moles of glucose = 0.636 mol

Step 3: Calculate the mass corresponding to 0.636 moles of glucose

0.636 mol × 180.2 g/mol = 115 g

Answer:

One.

Explanation:

Hello,

In this case, the equilibrium condition is characterized by the equality of the rates at which a process happen and the contrary process happen, so its ratio is 1. For instance, a chemical reaction at equilibrium will have a contant ratio of the velocity at which the products are formed and the reactants consumed

However, for the described insoluble solid that is allowed the reach equilibrium, the ratio of the rate at which ions join the solution and the rate at which ions join the lattice will be one since it reaches an equilibrium state.

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Answer:

Explanation:

the sand and water mixed together in a beaker is known as heterogeneous mixture. it is type of mixture in which the constituents are not distributed uniformly

Answer:

V = 5 cm³

ρ = 4 g/cm³

Explanation:

Step 1: Calculate the volume (V)

We have a wooden cuboid of dimensions 5 cm × 1 cm × 1 cm. We can calculate its volume using the following expression.

V = 5 cm × 1 cm × 1 cm

V = 5 cm³

Step 2: Calculate the density (ρ)

The density is equal to the mass divided by the volume.

ρ = m / V

ρ = 20 g / 5 cm³

ρ = 4 g/cm³

Answer: use you imagination

Explanation:

if you don’t know and will never know, just guess

Answer:

Shake it, imagine whats in it, or leave it alone.

Answer:

See explanation

Explanation:

In an octahedral crystal field, the metal is at the centre of an octahedron with ligands at the six corners of the octahedron. Approach of the ligand splits the orbitals into higher energy eg and lower energy t2g orbitals. The eg orbitals are 0.6∆o above the bari centre while the t2g orbitals are -0.4∆o below the bari centre.

In a tetrahedral crystal field, the tetrahedral crystal field splitting ∆t= 4/9∆o. In the tetrahedral crystal field, the t2 orbitals are at a higher energy and are +0.4∆t above the bari centre while the e orbitals are at a lower energy and are -0.6∆t below the bari center.

Answer:

Biology is based on organisms interactions

Explanation:

Not sure....if wrong pls correct me

Answer:

organisms

Explanation:

Biology is based on organisms interactions.

Answer:

I will need 49 grams of iron(II) chloride and 173 mL of water .

Explanation:

222 grams of 22.1 % FeCl₂ will require

222 x 0.221 gram of FeCl₂ and rest will be water .

49 gram of  FeCl₂ and 173 grams of water .

density of water is 1.00 g / mL

volume of water in mL = 173 / 1

= 173 mL

Hence I will need 49 grams of iron(II) chloride and 173 mL of water .

Answer:

same

Explanation:

confused

Answer: It’s A.

A New, high-tech materials are used to make prosthetic limbs for

people who need them

Explanation: Took the test

The engineering has influenced society by a new, high-tech materials are used to make prosthetic limbs for people who need them. Therefore, option A is correct.

Engineering is the design and construction of machinery, structures, and other things like bridges, tunnels, roads, cars, and buildings using scientific principles.

Engineers are specialists who create, design, analyze, construct, test, and evaluate machines, complex systems, buildings, gadgets, and materials to satisfy functional objectives and criteria while taking into account the practicality, regulation, safety, and cost constraints.

We have a wide range of engineering disciplines, many of which are highly specialized and created to address the great diversity of difficulties we confront. Chemical, civil, electrical, and mechanical engineering are the four primary categories into which engineering can be classified.

Thus, option A is correct.

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The correct answer with  the correct number of decimal places and  number of significant figures is 109.302 g.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:

1)All non-zero digits are significant .

2)All zeroes which occur between non-zero digits are significant.

3)All zeroes to the left and right of  a non-zero digit are not significant.

4) All zeroes on right  of decimal are significant if a non-zero number follows them.

5)All zeroes on right side of non-zero digit are significant.

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Answer:

B. False

Explanation:

The mass of a neutron is nearly the same mass of a proton whereas the electron is much less massive.

Exact masses are:

Neutron = 1.6749286x10²⁷ kg

Proton = 1.6726231x10⁻²⁷ kg

Electron = 9.1093897x10⁻³¹ kg

The mass of a proton plus the mass of an electron is:

1.6735340x10⁻²⁷ kg.

This mass is different to the mass of the neutron. Thus, the answer is:

Answer:

Both of these phenomena is due to the ignition temperature.

Explanation:

Trees don't spontaneously catch fire because there is a temperature above which materials combust. This is called the "ignition temperature." This temperature must be reached before the trees will ignite, and the external condition does not always harbor such high temperature.

Fires don't stop immediately because, while some parts of the flame has cooled down sufficiently below the ignition temperature, other parts of the flame have not. It takes time for all the part of the flame to cool down below ignition temperature for the burning to stop.

These are all due to the ignition temperature.

The ignition temperature is defined as the temperature at which a substance begins to burn spontaneously.

The ignition temperature of a woody material is about 343 °C (650 °F). This ignition temperature is much higher than ambient temperature hence trees don't spontaneously catch fire and burn all the time.

Also, all the parts of the burning fire are not at the same temperature. Some parts may cool below the ignition temperature quicker than other parts of the flame hence  the fires don't stop immediately as soon as they start.

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Answer:

The lone pair forces bonding atoms away from itself

Explanation:

According to Valence Shell Electron Pair Repulsion Theory (VSEPR), the shape of a molecule is determined by repulsions between electron pairs present in the valence shell of the central atom in a molecule.

Remember that electron pairs on the valence shell of the central atom in the molecule tend to position themselves as far apart from each other as possible. A lone pair takes up more space round the central atom than a bond pair. There is greater repulsion between a lone pair and a bond pair, this greater repulsion causes a distortion of molecular shape away from that predicted on the basis of VSEPR.

If you mean cubic cm, then it will be about 10 grams

Answer:

C) ball rollinflown a hill

Explanation:

The question asks to  identify the endothermic process in the list of options. By way of elimination, we have;

A) condensation of water on a wind shield of a car

Condensation is an exothermic process. That is, heat is given out as the gases change into the liquid state of matter.

B) formation of copper

This is an exothermic process. Capture of electrons by a cation is always exothermic.

C) ball rollinflown a hill

This is the correct option. Energy is absorbed by the ball as it moves on the hill

D) formation of ice from liquid water

Freezing is an example of exothermic reaction. Heat is given off to the surroundings.

E) oxide from copper and oxygen

Formation of metal oxides and most reactions involving oxygen are exothermic reactions,

Answer:

c. 2 OH⁻(aq) + 2 H⁺(aq) ⇒ 2 H₂O(l)

Explanation:

Step 1: Write the molecular equation

The molecular equation includes all the molecular species.

H₂A(aq) + 2 NaOH(aq) ⇒ Na₂A(aq) + 2 H₂O(l)

Step 2: Write the complete ionic equation

The complete ionic equation includes all the ions and the molecular species.

2 H⁺(aq) + A²⁻(aq) + 2 Na⁺(aq) + 2 OH⁻(aq) ⇒ 2 Na⁺(aq) + A²⁻(aq) + 2 H₂O(l)

Step 3: Write the net ionic equation

The net ionic equation includes only the ions that participate in the reaction and the molecular species.

2 OH⁻(aq) + 2 H⁺(aq) ⇒ 2 H₂O(l)

Answer:

mass (gram), volume (litre) and length (metre)

Explanation:

Matter is usually defined as anything that has mass and can occupy space. Matter exists primarily in three forms; solid, liquid or as a gas. Some of the properties of matter and there corresponding metric units are listed below

Properties ⇒ Metric unit

Mass         ⇒ gram

Volume    ⇒ litre

length       ⇒ metre

Answer:

I think a is the best answer. but really I can not confirm that.sorry for that.

The experimental methods which cannot be used to measure the rate of a chemical reaction is: B. measurement of the equilibrium concentration of an acidic product via titration with a strong base.

A chemical reaction can be defined as a chemical process which involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, so as to produce a new chemical compound.

The rate of a reaction is also known as reaction rate and it refers to the speed at a which the reactants in a chemical reaction are transformed into products. Some of the factors that affect the rate of a reaction are:

In Chemistry, an experimental method which cannot be used to measure the rate of a chemical reaction is the measurement of the equilibrium concentration of an acidic product by titrating it with a strong base because the concentration of product always remain the same.

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Answer and Explanation:

The refractive index states that the incidence angle sine to refraction angle sign

Now, According to the given situation, the manner that the materials from the smallest refractive index to the largest refractive index is presented below:-

Air = 1

Water = 1.33

Glass = 1.52

Quartz = 1.46

Diamond = 2.42

From the above  we can find the sequence that is

[tex]Air<Water<Quartz<Glass<Diamond[/tex]

Answer:

It has no effect on the metal.

Explanation:

Hello,

In this case, we must remember that metabolic acidosis is related with the presence of an excess of acidic substances in the blood as a result of higher levels carbon dioxide in the lungs or lower levels of bicarbonate in the blood as well. Nevertheless, since titanium is a metal unlikely to be chemically modified by those weak acids such as carbonic acid in the blood, we can infer that it has no effect on the metal when used in an artificial hip replacement.

Regards.

Answer: Option A.

high formalization

Explanation:

High formalization is not a reason organic structures promote innovation because formalization refers to written rules, regulations, policies or descriptions of organic structures and it is not a reason to promote innovation of organic structures because there will be continual manner of structure behavior and there will be reduced motivation.

Answer:

Valence electrons.

Explanation:

Hello,

In this case, the electron dot structure is widely known for representing the valence electrons as dots placed around the chemical symbol and they are defined as the electrons configured at the outermost shell of the studied atom. Commonly, electrons are placed up to two on each side of the elemental symbol for a maximum of eight. For instance, sodium has one valence electron, sulfur has six valence electrons, helium has eight valence electrons and so on. Valence electrons are known to be dependent of the electron configuration.

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Answer:

amount of fertaliser--> the independant variable is the one being changed