Natalie observes these characteristics in the model of an atom. (i) includes positive charge (ii) contains electrons (iii) explains the photoelectric effect (iv) suggests the probable location of electrons Which model is Natalie most likely examining? Bohr model Dalton’s model plum pudding model electron-cloud model

The three main ideas behind capitalism as defined by Adam Smith are "competition, self interest, and laissez-faire," since Smith was a heavy proponent of the "invisible hand of the market".

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Explanation:

↓↓↓↓↓↓↓

Density is the amount of mass in a given volume. It's a derived unit of measure. It is equal to mass divided by volume. It's measured in units such as grams per cubic centimeter and grams per milliliter. Density is the ratio of mass to volume. Density is a physical property of an object. It is degree of compactness of a substances. Relative density is used to separate solids, liquids, and gases. The gas in the container rises to the top because it has the least density. The liquids separate into individual layers based on their relative densities. The least dense liquid is on top. The most dense liquid is on bottom. The solids sink to the bottom of the container because they have the greatest density.

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Answer:

The density of a substance is the relationship between the mass of the substance and how much space it takes up (volume). The mass of atoms, their size, and how they are arranged determine the density of a substance. Density equals the mass of the substance divided by its volume; D = m/v.

Explanation:

Hello!

The chemical equation for the neutralization of HCl with KOH is the following:

HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

To calculate the concentration of the unknown solution, we can apply the following equation for the equivalence point:

So, the concentration of the HCl solution is 1,246 M

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Answer:

A

Explanation:

JJ Thomson concluded that atoms must balance positive and negative particles.

From his experiments, JJ Thomson concluded that atoms must balance positive and negative particles. He proposed a model known as the 'plum pudding' model, in which atoms were described as a positively charged mass with an equal amount of negative charge in the form of electrons embedded in it. This model suggested that atoms are made of thousands of electrons swimming around in a nebulous mass of positive charge.

96.56064 is the kilometers for 60 miles.

The distance between Happyville and Giggleland is approximately 96.56 kilometers when converted from miles.

To convert distance from miles to kilometers, we utilize the conversion factor of 1 mile = 1.60934 kilometers. Given that the distance between Happyville and Giggleland is 60 miles, you will multiply 60 by 1.60934.

So, Giggleland is approximately 96.56 kilometers from Happyville.

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Is their any specific options..?

Your question is subjective and depends on the context, individual preferences, and the methods available. The choice of method often depends on efficiency, ease of use, and the information at hand.

The question you asked, 'Which method is more convenient for you to use?' is subjective and depends on the individual's preferences, the situation, and the options available. As a tutor, it's difficult to provide a specific answer without knowing the context or the methods being referred to. But in general, the choice of method often depends on factors such as efficiency, ease of use, and the information you have at hand. It's essential to evaluate all of these factors before making a decision on the most convenient method to use.

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pretty sure its d since its one less layer of our atmosphere but I haven't learned this yet I'm just using common sense

Answer:

Increased exposure to radiation may cause skin ailments.

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Answer: Helps visualize feeding relationships in nature

Explanation:

A food web in nature is a interconnection of food chains. In the food chains the food is distributed among various organisms, when organism is consumed by the another.

A scientific model is a kind of simulation that can be used to mimic the natural processes occurring in nature. These can be useful in learning, understanding and demonstrating the natural process.

Among the options given,  Helps visualize feeding relationships in nature is the correct option. This will help in determining how food chains are related in a food web depending upon the feeding relationship between the organisms.  

Answer :

                      (D) [tex](NH_{4})_{2}S[/tex]      (C) [tex]Ba(NO_{3})_{2}[/tex]            (B) [tex]CuCl_{2}[/tex]

(A) [tex]K_{2}SO_{4}[/tex]                _                     [tex]BaSO_{4}[/tex]                          _

(B) [tex]CuCl_{2}[/tex]             [tex]Cu_{2}S_{2}[/tex]                     _                          

(C) [tex]Ba(NO_{3})_{2}[/tex]            BaS  

Explanation :

(1) Reaction for A + B

[tex]K_{2}SO_{4}[/tex] + [tex]CuCl_{2}\rightarrow[/tex] 2KCl + [tex]CuSO_{4}[/tex]

In this reaction, there is no precipitate formed as the products are souble.

(2) Reaction for A + C

[tex]K_{2}SO_{4}[/tex] + [tex]Ba(NO_{3})_{2}\rightarrow[/tex] [tex]BaSO_{4}[/tex] + [tex]KNO_{3}[/tex]

In this reaction, [tex]BaSO_{4}[/tex] is formed as precipitate as it do not dissolve.

(3) Reaction for A + D

[tex]K_{2}SO_{4}[/tex] + [tex](NH_{4})_{2}S\rightarrow[/tex] [tex]K_{2}S[/tex] + [tex](NH_{4})_{2}SO_{4}[/tex]

In this reaction, there is no precipitate formed as the products are souble.

(4) Reaction for B + D

[tex]2CuCl_{2}[/tex] + [tex]2(NH_{4})_{2}S\rightarrow[/tex] [tex]4NH_{4}Cl+Cu_{2}S_{2}[/tex]

In this reaction, [tex]Cu_{2}S_{2}[/tex] is formed as precipitate as it do not dissolve.

(5) Reaction for B + C

[tex]CuCl_{2}[/tex] + [tex]Ba(NO_{3})_{2}\rightarrow[/tex] [tex]BaCl_{2}[/tex] + [tex]Cu(NO_{3})_{2}[/tex]

In this reaction, there is no precipitate formed as the products are souble.

(6) Reaction for C + D

[tex]Ba(NO_{3})_{2}[/tex] + [tex](NH_{4})_{2}S\rightarrow[/tex] BaS + [tex]2NH_{4}NO_{3}[/tex]

In this reaction, BaS is formed as precipitate as it do not dissolve.

I think A is the correct answer but i am not positive

The first basic metal on the periodic table is lithium.

The first basic metal on the periodic table is lithium. It is part of Group 1, which is known as the alkali metals. Alkali metals are very reactive and form basic (alkaline) solutions when they react with water.

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The first basic metal on the periodic table is lithium, part of the alkali metals in group 1 of the periodic table. These metals are known for their reactivity, forming ions to create ionic compounds which are usually soluble in water.

The first basic metal on the periodic table is lithium. It's part of the alkali metals which constitute group 1 of the periodic table. The other alkali metals are sodium, potassium, rubidium, cesium, and francium. Despite hydrogen also being in group 1, it is not considered a metal but a nonmetal.

These alkali metals are known for their high reactivity. They readily form ions with a charge of 1+ to create ionic compounds, which usually dissolve in water. In addition, they react vigorously with water to produce hydrogen gas and a basic solution of the metal hydroxide, hence justifying the name alkali metal.

Many of these elements may not occur naturally in an uncombined state because they can readily react with water and oxygen in the air. Yet, when isolated from their naturally occurring minerals, they react very slowly with air due to the formation of a protective nonreactive film coating also known as passivation.

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In chlorine gas, two pairs of valence electrons the atoms share and a non- polar covalent bond is formed.

Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.

Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.

Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.

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The initial temperature of the water was 56.7 °C.

Step 1. Calculate the temperature change.

The formula for the heat (q) absorbed is

q = mCΔT

We can solve this equation to get

ΔT = q/(mC)

q = 5.49 × 10⁵ J; m = 3030 g; C = 4.184 J·°C⁻¹g⁻¹

∴ ΔT = 5.49 × 10⁵ J/(3030 g × 4.184 J·°C⁻¹g⁻¹) = 43.30 °C

Step 2. Calculate the initial temperature

ΔT = T_f – T_i = 100°C – T_i = 43.30 °C

T_i = 100 °C – 43.30 °C = 56.7 °C

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As the speed increases the Energy does not change. This is because of Law of conservation of mass. Energy can be created or destroyed.

Thus the energy levels will stay the same but the form in which the energy is presented may change.

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The electron's potential energy declines and its kinetic energy rises as its speed increases. The system's overall energy, however, doesn't change, since the increase in kinetic energy makes up for the decrease in potential energy.

Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is compressed or stretched, its potential energy increases. If a steel ball is raised above the ground as opposed to falling to the ground, it has more potential energy.

The square of the object's velocity determines the kinetic energy. In other words, when an object's velocity twice, its kinetic energy quadruples.

The mechanical energy of an object is the total of its potential and kinetic energies. A falling object loses potential energy while gaining kinetic energy. The difference between the increase in kinetic energy and the decrease in potential energy is exact. Work is a further crucial idea.

Thus, the increase in kinetic energy makes up for the decrease in potential energy.

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Answer:

1. The sediment is deposited by wind, flowing water, or other natural processes.

2. The sediment is gradually buried and compacted.

3. Dissolved minerals completely cement the sediment together.

Explanation:

Weathering is the breakdown of rock by agents such as wind and water. Erosion is the transporting of the broken rock material, or sediments, to a new location, where it is deposited.

As more sediment is deposited, it stacks up in layers. Eventually, the upper layers put pressure on the lower layers. This causes sediments to pack closer together in a process called compaction.

Through the process of cementation, minerals from groundwater form between sediment grains, connecting the grains together to form rock.

The rocks formed from deposition, compaction, and cementation of sediment are sedimentary rocks.

The sediment goes through a series of steps to become sedimentary rock, which includes deposition, burial and compaction, and cementation.

The correct order of the steps in which a layer of sediment becomes sedimentary rock is as follows:

Steps:

Mw = w * R * T / p * V

T = 88 + 273 => 361 K

p = 975 mmHg in atm :

1 atm  = 760 mmHg

975 mmg / 760 mmHg =>  1.28 atm

Therefore:

= 0.827 * 0.0821 * 361 /  1.28 * 0.270

=  24.51 / 0.3456

molar mass =  70.92 g/mol

Answer:

Ozone layer AKA ozone shield

Explanation:

I did this test too! :)

The concentration of A will be 0.34 mol·L⁻¹ after 60 min.

In a first-order reaction, the formula for the amount remaining after n half-lives is

[tex]\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\[/tex]

If [tex]t_{\frac{1}{2}} = \text{20 min}\\[/tex]

[tex]n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}[/tex]

∴ [tex]\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}[/tex]

The dependent variable is the breaking distance. The independent variable is the tire treads. The constant variable is the type of vehicle.

In an experiment, the independent variable is the variable that is being manipulated and the dependent variable that changes value as the independent variable is manipulated.

In this case, the breaking distance changes as the tire tread changes. This means that changes in the tire tread determines the breaking distance. Thus, the tire tread is the independent variable and the breaking distance is the dependent variable.

The experiment must be performed using the same type of car or vehicle. This is the constant variable.

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The independent variable in a study examining the impact of different tire treads on braking distance is the tire tread condition, while the dependent variable is the braking distance itself. Constants include factors that are kept the same throughout the experiment.

In the context of a study aiming to determine whether different tire treads affect the braking distance of a car, the independent variable is the type or condition of the tire treads being tested, because this is what the experiment changes to see its effect. The dependent variable is the braking distance, since it depends on the condition of the tire treads. The constants in such an experiment might include the make and model of the car, the driver, speed at which the brakes are applied, and environmental conditions like weather, if you can control and keep them the same throughout the testing. By maintaining constants, the study can ensure that any changes in the braking distance are likely due to the changes in the tire tread, which is the independent variable.

Explanation: During winters, there is decrease in temperature which leads to the freezing of water molecules.

The state change occurs from liquid state to solid state.

In case of water, the inter-molecular forces between the molecules decreases which leads to the increase in volume.

Which in turn leads to the decrease in the density of solid (ice). This increase in density tends to the floating of ice on water.

[tex]Density=\frac{Mass}{Volume}[/tex]

Thus, on freezing, the water expands and hence, there will be more space for the arctic animals to hunt in winters.

Answer: For red color firework we will use combination of strontium carbonate with lithium carbonate and for purple color we will use combination of strontium salts with copper salts.

Explanation:

There are various metallic salts which on performing flame test imparts characteristic color to the flame and this color is due to presence metal ions.

Color seen during the fireworks are mainly due to the presence of the metal ions present in the material from which the firework is made.

for example : strontium carbonate on flame test imparts bright red color to the flame where as barium chloride imparts green color to the flame.

The combinations of compounds are:

For red color firework we will use the combination of strontium carbonate with lithium carbonate because  combination strontium and lithium ions both imparts red color to the flame.

For purple color we will use the combination of strontium salts with copper salts because combination of strontium and copper ions imparts purple color to the flame.

Answer: The correct option is B.

Explanation: All the given reactions are a type of single displacement reactions.

Single displacement reactions are defined as the reactions in which a more reactive metal displaces a less reactive metal in a chemical reaction.

General equation for these reactions is:

[tex]AB+C\rightarrow CB+A[/tex]

For the given reactions, we will use the reactivity series. The metal which lies above in the reactivity series will easily displace the metal which lies below in the reactivity series.

Option A: For this reaction, zinc lies below aluminium in the reactivity series. Hence, zinc will not be able to displace aluminium in the chemical reaction.

Option B: For this reaction, Sodium is more reactive than calcium as it lies above in the reactivity series. Hence, sodium will easily displace calcium in the given chemical reaction.

Reaction follows:

[tex]CaBr_2+2Na\rightarrow 2NaBr+Ca[/tex]

Option C: For this reaction, hydrogen lies below magnesium in the reactivity series. Hence, hydrogen will not be able to displace magnesium in the chemical reaction.

Option D: For this reaction, Calcium lies below barium in the reactivity series. Hence, calcium will not be able to displace barium in the chemical reaction.

Option E: For this reaction, barium lies below lithium in the reactivity series. Hence, barium will not be able to displace lithium in the chemical reaction.

Reactivity series is attached below.

Answer : The reaction form products that are more stable than the reactants will be:

(B) [tex]CaBr_2+2Na\rightarrow 2NaBr+Ca[/tex]

Explanation :

Single displacement reactions : It is defined as the reactions in which a more reactive metal displaces a less reactive metal in a chemical reaction.

The general equation is:

[tex]AB+C\rightarrow CB+A[/tex]

According to the reactivity series, the metal which lies above in the reactivity series will easily displace the metal which lies below in the reactivity series.

(A) [tex]2AlBr_3+3Zn\rightarrow 3ZnBr_2+2Al[/tex]

In this reaction, zinc is less reactive than aluminum as it lies below in the reactivity series. Hence, zinc will not be able to displace aluminium in the chemical reaction. This reaction will not takes place.

(B) [tex]CaBr_2+2Na\rightarrow 2NaBr+Ca[/tex]

In this reaction, sodium is more reactive than calcium as it lies above in the reactivity series. Hence, sodium will easily displace calcium in the given chemical reaction.

(C) [tex]MgBr_2+H_2\rightarrow 2HBr+Mg[/tex]

In this reaction, hydrogen is less reactive than magnesium as it lies below in the reactivity series. Hence, hydrogen will not be able to displace magnesium in the chemical reaction. This reaction will not takes place.

(D) [tex]BaBr_2+Ca\rightarrow CaBr_2+Ba[/tex]

In this reaction, calcium is less reactive than barium as it lies below in the reactivity series. Hence, calcium will not be able to displace barium in the chemical reaction. This reaction will not takes place.

(E) [tex]2LiBr+Ba\rightarrow BaBr_2+2Li[/tex]

In this reaction, barium is less reactive than lithium as it lies below in the reactivity series. Hence, barium will not be able to displace lithium in the chemical reaction. This reaction will not takes place.

0.15mg = 0.00015g

Na =22g/mol

Cl= 35g/mol

35g/mol + 22g/mol = 57g/mol

0.00015g * 1 mol/ 57 g =2.63 * 10⁻⁶

0.00015g * 1 mol/ 57 g * NA/1mol = 2.63 * 10⁻⁶ NA

2.63 * 10⁻⁶ * 6.02 * 10²³ = 15.8326 * 10¹⁷

Answer:

2.56×10^-6 moles

Explanation:

Number of formula units is the same as the number if moles of NaCl present.

Number of moles= mass/ molar mass

Molar mass of NaCl= (23+35.5)= 58.5gmol-1

Given mass of NaCl= 0.15×10^-3g

Number of moles= 0.15×10^-3/58.5

Number of moles = 2.56×10^-6 moles

The total mass of the reactants equals the total mass of the products, because matter is not created or destroyed in the reaction.

The chemical formula for the compound magnesium perchlorate is Mg(ClO₄)₂

Magnesium perchlorate or Mg(ClO₄)₂ is an ionic compound.

Perchlorate here is an anion which is represented by ClO₄⁻. Perchlorate is a polyatiomic anion, where one Cl atom is bonded to four O atoms.

The magnesium cation is represented by Mg²⁺

So one Mg²⁺ cation combines with two ClO₄⁻ anion to form one molecule of Mg(ClO₄)₂

Answer: Mg(ClO₄)₂

Explanation: Correct on PLATO.

In order to follow the steps of inquiry Denver should add some salt to water taken in vessel and heat it. Once the water comes to a boil, Denver should insert a thermometer into the boiling water and measure the temperature of it. Pure water boils at 100°C. Denver will have to note if the salt water boils at a higher or lower temperature than 100°C.

Answer:

Impurities decrease the boiling point of a liquid, hence the boiling point of the salt solution will be less than that of pure water.

Explanation:

If Denver wants to know if adding salt to water will reduce the boiling point of water, Denver needs to set up the apparatus for the inquiry as follows;

A boiling tube

A Bunsen burner with wire gauze

A thermometer

A test tube holder

The thermometer is placed inside the boiling tube while the salt solution his allowed to boil. The boiling point is observed using the thermometer. Impurities decrease the boiling point of a liquid, hence the boiling point of the salt solution will be less than that of pure water.

Answer:The correct answer is option C.

Explanation:

Chemical property of the substance is a property which is observed in a chemical reaction during which identity or composition of the substance changes.

Iron when exposed to air ,react with atmospheric oxygen to from ferric oxide which is a reddish brown in color.Also termed as Rust.

[tex]Fe(s)+O_2(g)\righhtarrow Fe_2O_3(s)(\text{Reddish brown})[/tex]

Hence, the correct answer is option C.

Answer:

The correct answer is option C.

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

For Example: reactivity , toxicity etc.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

The chemical property observed by the the student is that iron rusts when exposed to air. The oxygen present in the air reacts with iron to form reddish brown compound named rust.

[tex]4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)[/tex]

Here, iron's reactivity is observed which is a chemical property of the iron.

Where mass ,  density and being a electricity conductor are physical properties.