How many grams of sodium chloride must be added to make 400 mL of a 0.600 M sodium chloride?​

Some types of plastics can change their properties, such as shape, color, or electrical conductivity, due to changes in temperature, pressure, or chemical environment. No, the change in plastic does not necessarily depend on its ability to absorb, reflect, or transmit light.

For example, shape-memory polymers can change their shape in response to temperature changes, without requiring any interaction with light. Similarly, electrochromic polymers can change their color or transparency in response to an electric field, without the need for light absorption. Therefore, the ability of a plastic to change depends on its intrinsic properties and its response to external stimuli, rather than its optical properties.

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The first location of chemical and mechanical digestion is the stomach. This statement is false.

Digestion is the breaking down of large insoluble food molecules into smaller water-soluble food molecules so that they can be absorbed into the aqueous plasma. In certain organisms, these small substances are absorbed from the small intestine into the bloodstream. Digestion is important for breaking down food into nutrients that the body uses for energy, growth, and cell repair that it needs to survive.

The digestive system has many forms. A basic distinction is made between internal and external digestion. External digestion evolved early in evolutionary history, and most fungi still rely on it. During this process, enzymes are secreted into the organism's environment, where organic substances are decomposed and some of the products diffuse back into the organism. Animals have a tube (alimentary canal) where internal digestion takes place. This is more efficient as more decomposition products can be trapped and the internal chemical environment can be more effectively controlled.

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Answer:

All of the above

Explanation:

Table MM.1: Bond Angles

Compound C-C-C Angle (straight chain or cyclic)

Propane 109.5 degrees

Butane 109.5 degrees

Pentane 109.5 degrees

Cyclopropane 60 degrees

Cyclobutane 90 degrees

Cyclopentane 108 degrees

The bond angles in organic compounds are primarily determined by the hybridization of the central atom and the number of electron pairs around it. In straight chain alkanes such as propane, butane, and pentane, the carbon atoms are sp³ hybridized and have tetrahedral geometry with bond angles of approximately 109.5°.

In cyclic compounds such as cyclopropane, cyclobutane, and cyclopentane, the bond angles are different from those in straight chain alkanes due to ring strain caused by the bond angles deviating from the ideal tetrahedral angle.

In cyclopropane, the bond angles are approximately 60°, while in cyclobutane they are approximately 90°, and in cyclopentane they are approximately 108°.

Overall, the bond angles in organic compounds are important in determining the overall shape and properties of the molecule.

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Answer:

D

Explanation:

If the atom is neutral, the sum of the core and valence electrons is the same as the number of protons, which is the atomic number of the element. So if the sum of the core and valence electrons in a neutral atom equals 25 , that is the number of protons in the atomic nucleus, and the atomic number of the element.

The number of valence electrons plus core electrons is the atomic number.

The variety of protons, neutrons, and electrons in an atom may be determined from a set of easy guidelines. The wide variety of protons within the nucleus of the atom is equal to the atomic quantity (Z). The quantity of electrons in an impartial atom is identical to the number of protons.

The variety of protons in a nucleus is called the atomic variety and usually equals the number of electrons in orbit approximately that nucleus (in a nonionized atom). For this reason, all atoms which have an equally wide variety of protons and the atomic range are atoms of the equal element.

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Answer

A reaction generally can be made to go more quickly by:

B. Adding a catalyst

C. Lowering the activation energy

D. Shaking the reactants

Explanation

The presence of a catalyst increases the rate of a reaction by lowering its activation energy. Chemical reactions occur when molecules collide with each other and undergo a chemical transformation.

Stirring and shaking provide some kinetic energy to the system. It increases slightly its temperature and the reaction rate. increasing the kinetic energy of reactant particles also means more of the reactant particles will have the minimum amount of energy required to form products (ie, activation energy) which leads to more successful collisions and therefore increases the reaction rate.

Answer:

One way to predict the type of bond that forms between two elements is to compare the electronegativities of the elements. In general, large differences in electronegativity result in ionic bonds, while smaller differences result in covalent bonds. the bonding is covalent bcz its between the most electronegative atom nitrogen and carbon .

Since the electronegativity difference between nitrogen and chlorine is not very much so chemical bonding is the only bond between them Thus the name of  N2C14 is Dinitrogen Tetrachloride and there is covalent bonding in this compound

There are two types of bonding in chemistry, one is ionic bonding while other is covalent bonding. Ionic bonding is due to the complete transfer of electron from one  element to other. While the covalent bond is due to the equal sharing of electron by each element

Metals and non metals combine to form ionic bond while the element with the same electronegativity form covalent bonding.

To name this we have to see the number of element and accordingly use di, tri and the write the name of first element and then second element's name with ide

Thus the name of  N2C14 is Dinitrogen Tetrachloride and there is covalent bonding in this compound

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150g•1moles/189.36g= 0.792moles

Answer:

The time you will get to Atlantic City is 3 pm

Explanation:

Given;

speed limit, v = 50 km/h

distance to be traveled, d = 150km

The time of the motion is given as;

time = distance / speed

t = (150 km) / (50 km/h)

t = 3 hours

Thus, if you leave your home at noon, the time you will get to Atlantic City is given as;

time to get home = 12 pm + 3hours = 3 pm

Therefore, the time you will get to Atlantic City is 3 pm

Answer:

\(1 \: mole = 6.02 \times {10}^{23} \: atoms \\ 6.5 \: moles = (6.5 \times {6.02 \times 10}^{23} ) \: atoms \\ = 3.913 \times {10}^{24} \: atoms\)

For the first calculation, 93.4 g/mL times 20 mL = g, the answer is 1868 g. The original measurements contained four and three significant digits, respectively, so the answer should have three significant digits (1868 g). For the second calculation, 489.7 nm times 53.061 s = m/s, the answer is 2609.74731 m/s. The original measurements contained four and five significant digits, respectively, so the answer should have five significant digits (2609.74731 m/s). For the third calculation, 216.3 multiplied 66.4 s = m/s, the answer is 14393.2 m/s.

The original measurements contained three and two significant digits, respectively, so the answer should have three significant digits (14393.2 m/s). To multiply or divide the following measurements, it is important to consider the number of significant digits of each measurement. To multiply or divide with accuracy, you should use the fewest number of significant digits in your final answer.

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Answer:  d) -705.55 kJ

Explanation:

Heat of reaction is the change of enthalpy during a chemical reaction with all substances in their standard states.

\(2CO_2(g)+2H_2O(l)\rightarrow C_2H_4(g)+3O_2(g)\) \(\Delta H=+1411.1kJ\)

Reversing the reaction, changes the sign of \(\Delta H\)

\(C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)\)

\(\Delta H=-1411.1kJ\)

On multiplying the reaction by \(\frac{1}{2}\) , enthalpy gets half:

\(0.5C_2H_4(g)+1.5O_2(g)\rightarrow CO_2(g)+H_2O(l)\)\(\Delta H=\frac{1}{2}\times -1411.1kJ=-705.55kJ/mol\)

Thus the enthalpy change for the given reaction is -705.55kJ

Answer:

I'm sorry, but I cannot see the observations or the data table you mentioned in your question. However, I can still provide you with some general guidance on how to approach the calculations and answer the questions based on the given information.

4. To calculate the concentration of the NaOH solution, you need to know the mass of NaOH used and the volume of the solution. The formula to calculate concentration is:

Concentration (in mol/L) = (Mass of NaOH (in grams) / molar mass of NaOH) / Volume of solution (in L)

Make sure to convert the mass of NaOH to moles by dividing it by the molar mass of NaOH. The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).

5. The balanced equation for the neutralization reaction between NaOH and HCl is:

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

(aq) represents an aqueous solution, and (l) represents a liquid.

6a. To calculate the average concentration of HCl in the sample from site B, you need to know the volumes and concentrations of the NaOH and HCl solutions used in the titration. Use the formula:

Concentration of HCl (in mol/L) = (Volume of NaOH solution (in L) * Concentration of NaOH (in mol/L)) / Volume of HCl solution (in L)

Multiply the volume of NaOH solution used by its concentration to find the amount of NaOH used. Then, divide this amount by the volume of HCl solution used to find the concentration of HCl.

6b. To determine the pH of the water at site B, you need to know the concentration of HCl from the previous calculation. The pH can be calculated using the formula:

pH = -log10[H+]

Since HCl is a strong acid, it dissociates completely into H+ ions. Therefore, the concentration of H+ ions is equal to the concentration of HCl. Take the negative logarithm (base 10) of the H+ concentration to find the pH.

To check if the water is safe, compare the calculated pH value to the range provided (pH 4.5-7.5). If the pH falls within this range, the water is considered safe for plant and animal reproduction in an aquatic environment.

6c. Use a similar calculation as in 6a to determine the average concentration of HCl in the sample from site C.

6d. Use the concentration of HCl from 6c to calculate the pH using the formula in 6b. Follow the same procedure to check if the water is safe based on the pH range.

7. To find the most current pH value for the Grand River, you can search for the latest data from reliable sources such as environmental agencies, research institutions, or government websites. Compare this pH value to the pH values obtained in the experiment to assess the difference between them.

Remember, without the specific data and observations, the calculations and comparisons provided here are only general guidelines. It's important to use the actual data from your experiment to obtain accurate results and conclusions.

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if you are referring to a specific set of observations or a scientific experiment, please provide more details or context, and I will do my best to assist you. Observations can be either the same or different depending on the specific conditions and factors involved in the experiment.

Observations may be the same when the experimental setup, variables, and conditions are identical, leading to consistent results. On the other hand, observations may differ when there are variations in experimental conditions, equipment, techniques, or external factors that influence the outcome. Additionally, human error or limitations in measurement accuracy can also contribute to differences in observations.

To determine why observations may be the same or different, it is essential to carefully analyze and consider all the factors and variables involved in the experiment or situation.

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Answer:

How many atoms of hydrogen and oxygen are in 2 molecules of water? ... 7) Using complete sentences, explain the difference between the chemical ... (s) solid, (l) liquid, (g) gas, (aq) aqueous solution (dissolved in water).

Explanation:

hope this helps✌️

Answer: They are called substances and mixtures

Explanation:

Answer:

pure substances and mixtures.

Explanation:

Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.

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Here's a general overview of how information travels through your body from a stimulus to a reaction:

1. Stimulus: A stimulus is any physical or chemical change in the environment that activates a sensory receptor in your body. Examples of stimuli include light, sound, touch, taste, and smell.

2. Sensory receptors: Sensory receptors are specialized cells that detect stimuli and convert them into electrical signals that can be transmitted to the nervous system. Each type of sensory receptor is specialized to respond to a specific type of stimulus.

3. Sensory neurons: Sensory neurons are nerve cells that transmit electrical signals from sensory receptors to the spinal cord or brain. The sensory neurons are part of the peripheral nervous system.

4. Spinal cord or brain: Depending on the type of stimulus and where it occurs in the body, the electrical signals from sensory neurons may travel directly to the spinal cord or to the brain. The spinal cord is the main pathway for signals that don't require conscious awareness, such as reflexes, while the brain processes signals that require conscious perception.

5. Processing: Once the electrical signals reach the spinal cord or brain, they are processed by a network of neurons that interprets the information and generates a response. This processing may involve multiple regions of the brain, depending on the complexity of the stimulus and the required response.

6. Motor neurons: Motor neurons are nerve cells that transmit electrical signals from the brain or spinal cord to muscles or glands. Motor neurons are part of the peripheral nervous system.

7. Response: The electrical signals from motor neurons cause muscles to contract or glands to secrete hormones or other substances, producing a physical response to the stimulus. This response may be immediate, as in the case of a reflex, or it may be delayed, as in the case of a conscious decision to move or speak.

Overall, the path of information from a stimulus to a reaction involves a complex interplay between sensory receptors, sensory neurons, the spinal cord and brain, motor neurons, and muscles or glands. Each step in this process is critical to the overall response to the stimulus, and any disruptions or damage to these systems can result in a range of sensory and motor deficits.

Zinc sulfate (ZnSO4) can serve as a good source of zinc for the body. It is a water-soluble salt that can provide zinc ions for absorption in the gastrointestinal tract.

Ingesting zinc ions has been shown to have some effect in reducing the length of a cold. Therefore, zinc sulfate can be an effective option for boosting zinc levels in the body and potentially supporting immune function during a cold.

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Comparing the data obtained online, the first group is more precise

The reason the above selection is correct is as follows;

Question: Parts of the question appear missing from a similar question online and included here;

First Group:

\(\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.77 \ cm&2.60 \ cm&2.80 \ cm&2.65 \ cm&2.75 \ cm&2.65 \ cm& 2.68 \ cm\end{array}\right]\)

Second Group

\(\begin{array}{|c|c|c|c|c|c|c|} Team \ a &Team \ b&Team \ c&Team \ d&Team \ e&Team \ f&Team \ g\\2.70 \ cm&2.78 \ cm&2.62 \ cm&2.65 \ cm&2.75 \ cm&2.80 \ cm& 2.60 \ cm\end{array}\right]\)

Calculations for the first group:

The average = (2.77 + 2.60 + 2.80 + 2.65 + 2.75 + 2.65 + 2.68)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range of the average = ±0.2/2 = ±0.1

The precision of the first measurement is 2.7 ± 0.1 cm

Calculations for the second group:

The average = (2.70 + 2.78 + 2.62 + 2.65 + 2.75 + 2.80 + 2.60)/7 = 2.7

The range = 2.80 - 2.60 = 0.20

The approximate ± range from the average = ±0.2/2 = ±0.1

The range of values from the average is approximately ±0.1 cm

The precision of the first measurement is 2.7 ± 0.1 cm

Method to determine precision:

Precision is given by the finding the average deviation and the standard deviation as follows;

\(\mathbf{Average \ deviation} = \dfrac{\sum \left | x - \mu \right |}{n}\)

\(\mathbf{Standard\ deviation} =\sqrt{\dfrac{\sum \left ( x - \mu \right )^2}{n}}\)

Where;

μ = The mean or average = 2.7

n = The number of items (count) of the data = 7

For the first group, we have;

\(\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.07 + 0.1 + 0.1 + 0.05 + 0.05 + 0.05 + 0.02 }{7} = \mathbf{0.062857}\)

The average deviation of the first group = 0.062857

∑(x - μ)² ≈ 0.0328

\(\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0328}{7}} \approx \mathbf{0.068452}\)

For the second group, we have;

\(\mathbf{\dfrac{\sum \left | x - \mu \right |}{n}} = \dfrac{0.0+ 0.08 + 0.08 + 0.05 + 0.05 + 0.1 + 0.1 }{7} = \mathbf{0.06571428571}\)

∑(x - μ)² ≈ 0.0378

\(\mathbf{The \ standard\ deviation} =\sqrt{\dfrac{0.0378}{7}} \approx \mathbf{0.073485}\)

By using the average deviation, and standard deviation values, the deviation of the second group is more than the first group and therefore the first group is more precise

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The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture and circulates blood throughout the body.

Answer:

Skeletal, cardiac muscles.

Explanation:

It helps move the body around. Your welcome :)

Answer:

10

Explanation:

Khan Academy

Answer:

Volume

Explanation:

Answer:

Density second option is correct i hope so

In the formation of ammonia, nitrogen shares three electrons in a covalent bond with three hydrogen atoms

We can see  that nitrogen has five electrons on its outermost shell. It is able to accept three electrons and share them with another atom in order to form a covalent bond.

In the formation of ammonia, nitrogen shares three electrons in a covalent bond with three hydrogen atoms to give the compound \(NH_{3}\). This explains why the bond that exists in the ammonia molecule is a covalent bond.

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The description included refers to safety measurements when using microbiological transfer loops in the laboratory.

These are simple tools used to pick up small samples of microorganisms, which is often used to transfer the microorganisms.

Transfer loops can easily contaminate; due to this, it is essential to flame loops. This should be done either by:

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Exposure route can be defined as a way by means of which a person can come in contact with the hazardous chemicals, this can be prevented by wearing personal protective equipments.

Personal protective equipment is a protective clothing which is worn to protect the wearer's body from hazard or injury.The hazards which can be addressed by the use of personal protective equipment are physical,chemical and bio hazards.

It imposes a barrier between the user and the working environment.The main purpose of personal protective equipment is to reduce exposure of employees to the hazards.

It has a limitation that it does not eliminate the hazard and may lead to harm to the employee if the equipment is damaged.

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The statement is false. The relationship between the amount of reactant consumed and time is not curvilinear, but rather follows a specific pattern based on the reaction kinetics.

In most chemical reactions, the amount of reactant consumed with respect to time follows a linear or exponential relationship. In a linear relationship, the rate of reaction is constant, and the amount of reactant consumed increases linearly with time. This often occurs in simple reactions with a constant rate. In contrast, an exponential relationship is observed in many reactions governed by complex kinetics. Initially, the reaction rate is high, and the amount of reactant consumed is rapid. As the reaction progresses, the rate slows down, and the amount of reactant consumed per unit of time decreases exponentially. This can occur in reactions with multiple steps, intermediate species, or factors affecting the reaction rate. Therefore, the relationship between the amount of reactant consumed and time is typically linear or exponential, depending on the reaction kinetics, and not curvilinear.

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The medication can treat people who have the disease described. According to the commercial, the drug has FDA approval to treat a condition whose symptoms are listed.

Additionally, the narrator notes that the medication only comes with a prescription and has 1% of the active substance. We can deduce from this information that the drug can effectively treat persons who have the condition generating these symptoms, but obtaining it requires a prescription. The commercial provides no support for the other possibilities.

Therefore, the correct option is D.

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Answers:

in the wild of over 100 years,...

A captive individual lived at least 255 years!

Explanation:

The giant Galapagos tortoises (Chelonoidis nigra) are famous because this species was observed by Darwin during his travel. This species is native from the Galapagos Islands and currently is in danger of extinction. Galapagos tortoises are recognized as one of the longest vertebrates. In this regard, it is worthy to note that a giant tortoise named Harriet lived 255 years, this specimen was in the Australian Zoo.