Answer: A representative particle can be an atom, and an ion. a molecule, or a formula unit.
Explanation:
A representative particle is the smallest unit in which a substance naturally exists. For the majority of elements, the representative particle is the atom. Iron, carbon, and helium consist of iron atoms, carbon atoms, and helium atom, respectively.
Radon is a naturally occurring radioactive gas that is odorless and tasteless.
Atoms-the smallest particle of an element
Ions-atoms with positive or negative charges.
Molecules- two or more covalently bonded atoms.
Formula units- the simplest ratio of ions that make up an ionic compound.
for the following reaction how many grams of h20 will be produced if you react 3.7 grams of B2H6? B2h6 +3O2-2hbo2+ 2 H20
Answer:
4.8 g H₂O
Explanation:
To find the mass of water, you need to (1) convert grams B₂H₆ to moles B₂H₆ (via molar mass from periodic table), then (2) convert moles B₂H₆ to moles H₂O (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles H₂O to grams H₂O (via molar mass from periodic table).
It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs because the given value (3.7 grams) has 2 sig figs.
Molar Mass (B₂H₆): 2(10.811 g/mol) + 6(1.008 g/mol)
Molar Mass (B₂H₆): 27.67 g/mol
1 B₂H₆ + 3 O₂ ---> 2 HBO₂ + 2 H₂O
^ ^
Molar Mass (H₂O): 15.998 g/mol + 2(1.008 g/mol)
Molar Mass (H₂O): 18.014 g/mol
3.7 g B₂H₆ 1 mole 2 moles H₂O 18.014 g
---------------- x --------------- x ----------------------- x ----------------- = 4.8 g H₂O
27.67 g 1 mole B₂H₆ 1 mole
Use the drop-down menus to determine the changes of
state that are missing from the triangle.
Answer:
can you post a photo? to help y with the question
Explanation:
The heat of vaporization of water is 540 cal/g. How much heat is needed to change 4.28g of water to steam?
Answer:
2311.2 cal
Explanation:
540 cal / g * 4.28 g = 2311.2 cal
2311.2 cal heat is needed to change 4.28g of water to steam.
What is heat?Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object.
The heat of vaporization is defined as the amount of heat needed to turn 1g of a liquid into a vapour, without a rise in the temperature of the liquid.
The heat of vaporization is equal to the thermal energy required for vaporization divided by the mass of the substance that is vaporizing. Its formula is Hv = q/m.
Putting the values in the formula:
540 cal / g x 4.28 g = 2311.2 cal
Hence, 2311.2 cal heat is needed to change 4.28g of water to steam.
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QUESTION 1
What happens when water droplets are on a glass surface?
O They scatter around, maintaining their spherical shapes.
They spread and stick to the surface.
They join to form on gigantic sphere.
O They evaporate.
Answer:
It appears all of them are correct
Smaller drops will scatter around while maintaining their shape
Larger drop will spread stick to the surface.
and drops close together will join to form on gigantic sphere(but not perfect sphere)
and if they are in the sun, they'll eventually evaporate
Explanation:
If data from a clinical trial contains personal information about a study participant, which process should be used to separate identifying information from health information?
A. De-identification
B. Informed consent
C. ALCOA
D. Good documentation practices
If data from a clinical trial contains personal information about a study participant, De-identification process should be used to separate identifying information from health information. Thus, Option (A) is correct
What is De-identification process ?De-identification is a process of detecting identifiers (e.g., personal names and social security numbers) that directly or indirectly point to a person (or entity) and deleting those identifiers from the data.
De-identification and anonymization are strategies that are used to remove patient identifiers in electronic health record (EHR) data.
Hence, De-identification process should be used to separate identifying information from health information. Thus, Option (A) is correct.
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Select the correct answer from each drop-down menu. At chemical equilibrium, the amount of because .
A chemical equilibrium when the amounts of reactants or products no longer change.
Explanation:
Chemical equilibrium is a dynamic process, meaning the rate of formation of products by the forward reaction is equal to the rate at which the products re-form reactants by the reverse reaction.
Write a balanced nuclear equation for the β emission of the following isotopes
92
Sr
38
The balanced nuclear equation for the β emission of the following isotopes is seen below:
92 92 0
Sr ⇒ Y + e
38 39 -1
What is Beta emission?
This is also known as beta decay in which a beta ray is emitted from an atomic nucleus.
The element formed during the beta emission of strontium is referred to as Yttrium.
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Charge q is 1 unit of distance away from the source charge S. Charge p is two times further away. The force exerted between S and q is _____ the force exerted between S and p.
The force exerted between S and q is ___4 times____ the force exerted between S and p.
What is Coulomb's law ?Coulomb's law states that , the electrostatic force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and is inversely proportional to the square of the distance between them
It is given by
[tex]\rm F = k_e \dfrac{q_1 q_2}{r^2}[/tex]
r is the distance between two bodies
It is given that
Charge q is 1 unit of distance away from the source charge S
Charge p is two times further away from the source charge S
force exerted between S and q
distance between the charges is 1 unit
[tex]\rm F_{qs} = k_e \dfrac{q_q q_s}{1^2}\\\\\rm F_{ps} = k_e \dfrac{q_p q_s}{2^2}\\[/tex]
The force exerted between S and q is _______ the force exerted between S and p.
[tex]\rm F_{qs} = k_e \dfrac{q_q q_s}{1^2} = F_{ps} = k_e \dfrac{q_p q_s}{2^2}\\\\[/tex]
Assuming the charges to be q units
Then
[tex]\rm F_{qs} = k_e \dfrac{q_q q_s}{1^2} = F_{ps} = k_e \dfrac{q_p q_s}{2^2}\\\\\\\\\dfrac {F_{qs}}{F_{ps}} = \dfrac{2^2}{1^2} = 4 \\\\\\{F_{qs}} = 4{F_{ps}}[/tex]
Therefore ,
The force exerted between S and q is ___4 times____ the force exerted between S and p.
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Which molecule is polar, based on structure?
A. sulfur dioxide
OB. carbon disulphide
OC. ethylene
O D. carbon tetrachloride
Reset
Answer:
Sulfur dioxide (SO2)
⇒ Why is this the best option?
To determine the polarity of the molecule, there are two requirements. The first one has a variety of terminal atoms, whereas the second has a lone pair on the center atoms. The molecule is polar if one of the requirements is met; else, it is nonpolar. The oxygen atom is a terminal atom because it surrounds the sulfur atom, which is the center element in the SO2 molecule's Lewis structure. In this molecule, there are two terminal oxygen atoms. If we look at the first criterion, we can see that it is not met because it calls for the presence of two separate terminal atoms.
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When 50.5 g iron(III) oxide reacts with carbon monoxide, 32.2 g iron is produced. What is the percent yield of the reaction?
Fe2O3(s)+3CO(g)→2Fe(s)+3CO2(g)
Taking into account definition of percent yield, the percent yield for the reaction is 91.17%.
Reaction stoichiometryIn first place, the balanced reaction is:
Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe₂O₃: 1 mole CO: 3 moles Fe: 2 moles CO₂: 3 molesThe molar mass of the compounds is:
Fe₂O₃: 159.7 g/moleCO: 28 g/moleFe: 55.85 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe₂O₃: 1 mole ×159.7 g/mole= 159.7 grams CO: 3 moles ×28 g/mole= 84 gramsFe: 2 moles ×55.85 g/mole= 111.7 gramsCO₂: 3 moles ×44 g/mole= 132 gramsMass of Fe formedThe following rule of three can be applied: if by reaction stoichiometry 159.7 grams of Fe₂O₃ form 111.7 grams of Fe, 50.5 grams of Fe₂O₃ form how much mass of Fe?
[tex]mass of Fe=\frac{50.5 grams of Fe_{2} O_{3} x111.7 grams of Fe}{159.7 grams of Fe_{2} O_{3}}[/tex]
mass of Fe= 35.32 grams
Then, 35.32 grams of Fe can be produced from 50.5 g iron(III) oxide.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.
The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
[tex]percent yield=\frac{actual yield}{theorical yield}x100[/tex]
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.
Percent yield for the reaction in this caseIn this case, you know:
actual yield= 32.2 gramstheorical yield= 35.32 gramsReplacing in the definition of percent yields:
[tex]percent yield=\frac{32.2grams}{35.32grams}x100[/tex]
Solving:
percent yield= 91.17%
Finally, the percent yield for the reaction is 91.17%.
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How do I draw energy level diagrams?
Energy levels inside an atom are the specific energies that electrons can have when energy occupies specific orbitals. Electrons can be excited to higher energy levels by absorbing energy from the surroundings, an equivalent light is emitted when an electron returns from a high energy state to a lower one. Representation of this diagrammatic is known as the energy level diagram.
Identify bond types as either ionic, metallic or covalent
HCN
Fe
PbO
Si
Answer:
In ionic bond one element should be metal and next should be non metal. in covalent both element should be met Alice. if there valence electron is less than 4 than it is metal or more than 4 it is non metal.
What is the number of moles in 4.20 kg of carbon dioxide
Answer:
95.45 moles
Explanation:
CO2 has mole weight 12 + 2 *16 = 44 gm/mole
4200 gm / 44 gm/mole = 95.45 moles
Which Ions oxidize aluminum?
Li^+, Ca^2+, Ag+, Sn^2+
Aluminum can be oxidized by [tex]Li^{+}[/tex] and [tex]Ca^{2+}[/tex]
What is oxidizing?Some of the metal corrodes (or oxidizes) and forms the corresponding metal oxide on the surface as a result of a chemical reaction between the metal surface and the oxygen in the air. The corrosion products that occur in some metals, like steel, are highly apparent and loose.
According to reactivity series (The array of metals in the descending order of their reactivities is referred to as the metals' reactivity series. It is sometimes referred to as the metals in the activity series.)
Lithium and calcium ions are more reactive than aluminum ion and they are less electronegative.
Since silver and tin are more electronegative than aluminum so, they cannot oxidize aluminum.
∴ [tex]Li^{+}[/tex] and [tex]Ca^{+2}[/tex] ions can oxidize aluminum.
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What is gravitational potential energy?
OA. Energy stored in atoms
B. Energy of motion
C. Energy stored in height differences
D. Energy from light
Answer:
c.
Explanation:
gravitational potential energy describes the amount of energy something could have based off of the amount of gravity acting on the object. so energy stored in height difference would be the best answer because gravity is acting on those objec6s
Which is the most likely to be reduced?
OA. Cu²+
OB. Zn²+
OC. Fe³+
OD. Fe2+
Answer:
OC. Fe³+
Explanation:
Greater reduction potential (bigger positive E value) means that things wants to get electrons. For this, you have to look at the chart that I have attached. Since, Fe3+ has highest E value out of other options, it will likely be reduced.
The species which is most likely to get reduced is Fe³⁺.
What is Reduction?Reduction is the process of the addition of electrons and loss of oxygen atoms. It is part of redox reactions.
Redox reactions are the type of reactions in which oxidation and reduction simultaneously take place. Oxidation is the addition of oxygen atoms. Reduction is the removal of oxygen atoms.
Redox reaction can be represented as:
PbO (s) + H₂ (g) → Pb(s) + H₂O (l)
In the above reaction, PbO is getting reduced and H₂ is getting oxidized.
Fe³⁺ is most likely to get reduced because the more positive the value of reduction potential, the more will be its tendency to get reduced.
In the given four species, the value of the reduction potential of Fe³⁺ is the highest.
Values of the reduction potential of four species are:
Cu²⁺ = 0.34Zn²⁺ = - 0.76Fe³⁺ = 0.77Fe²⁺ = -0.45Learn more about, redox reactions:
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What is the SI unit used to measure weight?
Answer:
The si unit used to measure weight is kilogram /kg
What information does a net ionic equation give that the complete ionic equation does not show?
A complete ionic equation shows ions formed from each of the species. It also show the charge on each of the ions.It also shows all reactants as compounds or elements. The ions formed and their charges can only be inferred from this equation.
What is a Net Ionic equation ?The net ionic equation shows the chemical species involve in chemical reaction while the complete ionic equation also involve the spectator ions.
What are Spectator ions ?These ions are same in both side of chemical reaction and thus cancels out each other.
Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.
The net ionic equation state that whether precipitation is occur or not.
If the chemical reaction have no net ionic equation it means all are in aqueous from not precipitation occur.
Consider the following example:Balanced Chemical equation:
HClO₂(aq) + NaOH(aq) → H₂O(l) + NaClO₂ (aq)
Ionic equation:
H⁺(aq) + ClO₂⁻(aq) + Na⁺(aq) + OH⁻(aq) → H₂O(l) + Na⁺(aq) + ClO₂⁻ (aq)
Net ionic equation:
H⁺(aq) + OH⁻(aq) → H₂O(l)
The ClO₂⁻(aq) and Na⁺ (aq) are spectator ions that's why these are not written in net ionic equation.
The water can not be splitted into ions because it is present in liquid form.
Hence, The net ionic equation shows the chemical species involve in chemical reaction while the complete ionic equation also involve the spectator ions.
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Which of the following methods correctly describes the preparation of 1.00 L of an aqueous solution of 0.500 M NaOH?
Answer:
Place 20.0 g NaOH(s) in a flask and dilute to 1.00 L with water.
Explanation:
Question 34 (1 point)
4.00 moles of Ar gas and 5.00 of Xe gas are added to a flask, giving a total pressure
of 15.00 atm. What is the partial pressure, in atm, due to just Xe gas in this system?
6.67 atm
5.00 atm
9.00 atm
8.33 atm
Answer:
8.33 atm
Explanation:
Xe is 5 out of (4+5) or 5 / 9 ths of the gas present
5/9 * 15 atm = 8.33 atm
what is the structure of alcohol?
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Balance the following chemical equation:
P4(s)+ O2(g) - P4 O10 (s)
Answer:
The balanced chemical equation is P₄ (s) + 5O₂ (g) → P₄O₁₀ (s)
Explanation:
In order to balance the chemical equation, you first need to see what's out of balance.
In this case our Oxygen is not balanced, so in order to make the two the same, we need to see what coefficient we need to add to the compounds to balance the problem.
So, adding a coefficient of 5 to the O₂ will result in an equal number of oxygen on both sides.
Which option below has the correct order of steps to complete a stoichiometric calculation to determine percent yield?
A. Write a balanced equation, determine the limiting reactant, calculate the theoretical yield, calculate the percent yield
B. Write a balanced equation, determine the excess reactant, calculate the theoretical yield, calculate the percent yield
C. Determine the excess reactant, write a balanced equation, calculate the theoretical yield, calculate the percent yield
D. Calculate the percent yield, determine the limiting reactant, write a balanced equation, calculate the theoretical yield
To determine the percentage yield, do the following:
Write the balance equationDetermine the limiting reactant Calculate the theoretical yieldCalculate the percentage yield (Option A)What is stoichiometry?Stoichiometry simply defined the relationships of the various quantities as they react in a chemical reaction
Scientist are mostly inquisitive and as such may want to determine the percentage yield of a reaction even before carrying it out.
How to determine the percentage yieldTo determine the percentage for a given reaction, we must set up the following:
Write the balance equationDetermine the limiting reactant Calculate the theoretical yieldCalculate the percentage yieldFrom the above, we can conclude that option A gives the right steps if we must successfully determine the percentage yield of a reaction.
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Answer:
A
Explanation:
Edge 2022
Select two that are true
Answer:
The two that are true are, "this represents a pure compound in two different states" and "it represents a mixture a solid and a gas".
Explanation:
This two are concluded only from the picture and the use of uniform colors throughout the picture (Showing the same element).
Is XeCl4 a molecular compound?
Answer:
Hint for Naming XeCl4
We have two non-metals so this is a molecular (sometimes called covalent) compound.
|
Dilution
A chemist makes 620. ml. of zinc nitrate • (Zn(NO3)₂) working solution by adding distilled water to 210. mL of a 4.93 M stock solution of zinc nitrate in water.
Calculate the concentration of the chemist's working solution. Round your answer to 3 significant digits.
1.66 M is the concentration of the chemist's working solution.
What is molarity?Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.
In this case, we have a solution of Zn(NO₃)₂.
The chemist wants to prepare a dilute solution of this reactant.
The stock solution of the nitrate has a concentration of 4.93 M, and he wants to prepare 620 mL of a more dilute concentration of the same solution. He adds 210 mL of the stock and completes it with water until it reaches 620 mL.
We want to know the concentration of this diluted solution.
As we are working with the same solution, we can assume that the moles of the stock solution will be conserved in the diluted solution so:
[tex]n_1[/tex]= [tex]n_2[/tex] (1)
and we also know that:
n = M x [tex]V_2[/tex]
If we replace this expression in (1) we have:
[tex]M_1[/tex] x [tex]V_1[/tex]= [tex]M_2[/tex] x [tex]V_2[/tex]
Where 1, would be the stock solution and 2, the solution we want to prepare.
So, we already know the concentration and volume used of the stock solution and the desired volume of the diluted one, therefore, all we have to do is replace the given data in (2) and solve for the concentration which is [tex]M_2[/tex]:
4.93 x 210 = 620 x[tex]M_2[/tex]
[tex]M_2[/tex] = 1.66 M
This is the concentration of the solution prepared.
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A gas has a volume of 350 mL at 45 oK. If the volume changes to 400 mL, what is the new temperature?
Answer:
T₂ = 39.4 °K
Explanation:
Because you are only dealing with volume and temperature, you can use Charles' Law to find the missing value. The formula looks like this:
V₁ / T₁ = V₂ / T₂
In this formula, "V₁" and T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You have been given values for all of the variables except for "T₂". Therefore, by plugging these values into the formula, you can simplify to find the answer.
V₁ = 350 mL T₁ = 45 °K
V₂ = 400 mL T₂ = ?
V₁ / T₁ = V₂ / T₂ <----- Charles' Law formula
(350 mL)(45 °K) = (400 mL)T₂ <----- Insert values into variables
15750 = (400 mL)T₂ <----- Multiply left side
39.4 = T₂ <----- Divide both sides by 400
What is the pH of a 8.4x10⁻6 M H+solution?
What is pH?
pH=[?]
The pH can be obtained directly from the concentration using the formula below pH = - log [H⁺] Hence, pH of a 8.4x10⁻⁶ M H⁺ solution is 5.08.
What is pH ?
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
Taking the negative logarithm of the concentration of hydronium ions that are in the solution:
pH = - log [H⁺]
= - log [8.4x10⁻⁶ ]
= 5.08
Hence, pH of a 8.4x10⁻⁶ M H⁺ solution is 5.08.
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Although these days many people have “self-cleaning” ovens, if your oven gets really dirty you may have to resort to one of the spray-on oven cleaner preparations sold in supermarkets. What evidence is there that such oven cleaners work by a chemical reaction?
Oven cleaners typically contain a layer of sodium hydroxide, which converts the greases and oils on the oven walls into soap, which can then be cleaned away more easily.
What is an oven?A chamber used for baking, heating, or drying.
Self-cleaning ovens emit dangerous fumes into the air with an unpleasant burning smell. Self-cleaning ovens reach high temperatures and produce fumes from the cooking of food particles. These fumes circulate with the air and can affect the home substances.
Spray-on oven cleaner ovens contain a layer (sodium hydroxide), which converts the greases of the oven walls into soap, which can then be cleaned away more easily.
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A phase diagram for elemental carbon is shown below.
Starting at liquid carbon, which action(s) would produce carbon gas?
Answer:
C.) lowering the pressure
Explanation:
As you can see, the liquid and gas phases are stacked right on top of each other. Since temperature is on the x-axis, this means that these phases exist at the same temperature (disregarding any other variables). This means that changing the temperature would not change the liquid phase to the gas phase.
If we want to get the sample into the gas phase, we need to manipulate the sample based on the y-axis. To lower the sample into the gas phase, we need to lower the pressure, which is the variable on the y-axis. This will work because pressure decreases as you go down the y-axis.