Equal
According to the law of conservation of mass, the mass of reactants and products are equal.
Explanation;Law of conservation of mass is a fundamental principle which states that matter cannot be created or destroyed in an isolated system. In chemical equations the law is observed such that the mass of the reactants is equal to the mass of the products. This is done by balancing chemical equations. A balanced equation is a chemical equation with the same number of atoms of each element on both sides of the equation. Balancing chemical equations ensures that the law of conservation of mass i observed.What physical properties would a pencil lead have
Suppose the innermost orbit an electron can occupy has an energy level of -19 eV. Based on the absorption spectrum shown below, what is the energy of energy level 4?
The energy of the 4th energy level, taking into account the shift in energy levels in the given problem, is -6.25 eV.
Explanation:The energy levels of an electron in an atom are quantized, meaning they can only have certain specific values. The question states that the innermost orbit of an electron has an energy level of -19 eV.
In a regular hydrogen atom, the ground state or the lowest energy state is -13.6 eV. If we consider the absorption spectrum, it provides information about the energy required for the electron to move from one energy state to another.
Given that the innermost energy state (n = 1) is -19 eV and not the regular -13.6 eV, it implies that energy levels of the hydrogen atom have been shifted by a constant value. The difference, i.e., -19 eV - (-13.6 eV) = -5.4 eV needs to be considered.
So, for the 4th energy level, E4, it should be E4 = (-13.6 eV / 4²) - 5.4 eV = -0.85 - 5.4 = -6.25 eV. Note, the energy decreases as we move from the 1st to 4th energy level, hence the negative sign.
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Which mass of kcl would you add to water to make a 2.00 l of a 1.20-m solution?
How many molecules of rubp are oxygenated for each molecule of co2 that is released by photorespiration?
What is a base used in toothpaste sorbitol carrageenan magnesium hydroxide sodium lauryl sulfate
Answer:The correct answer is magnesium hydroxide.
Explanation
Magnesium hydroxide is a base used in toothpaste. The role of base is to neutralize the acid secreted out in our mouth by bacteria present in our mouth which causes tooth decay and other related ailments.
[tex]Mg(OH)_2(aq)+2H^+(aq)\rightarrow 2H_2O(l)+Mg^{2+}(aq)[/tex]
Where as sorbitol is sugar alcohol found in the fruits and plants. Sodium lauryl sulfate is s basic salt which acts as a surfactant used for cleaning purposes.
Carrageenan is a substance extracted from red and purple seaweed used as thickening or emulsifying agents in the food products.
Answer:
Magnesium hydroxide
Explanation:
Toothpaste as such is a mild base. This helps to neutralize the acid produced in the mouth as a result of the action of certain bacteria that help in breaking down food.
Sorbitol is a sugar alcohol and acidic in nature
Carrageenan is a linear polysaccharide and also acidic
Sodium lauryl sulfate is a surfactant and mildly acidic
However, magnesium hydroxide (Mg(OH)2) is a base which is used in toothpastes.
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A student heats a 15.0 gram metallic sphere of unknown composition to a temperature of 98°C. The sphere is transferred to a calorimeter containing 100. mL of water at a temperature of 25.0°C. The student observes that the resulting temperture of both the water and the object is 27.1°C after the object is submerged.
1. Describe, in terms of the object and the water, the flow of heat energy that took place during the experiment.
2. Calculate the amount of heat energy gained by the water in the calorimeter.
Q = mc∆T???
3. Using the quantity of heat calculated in the previous question, determine the specific heat of the object.
1. Heat always flow from a region of higher temperature to a lower temperature, just like concentration gradient. So in this case, since the metallic sphere is hotter than water, so naturally heat energy flows from the metallic sphere to the water.
2. We use the formula:
Q = m C ∆T
where Q is the heat energy gained, m is mass of water, C is heat capacity of water = 4.184 J/g°C and ΔT is change in temperature
Since density of water is 1 g/mL, so mass is also 100g, therefore:
Q = 100 g * 4.184 J/g°C * (27.1°C - 25°C)
Q = 878.64 J
3. Heat gained by the water is equal to the heat lost by the metal, therefore:
Q(water) = - Q(metal)
878.64 J = - 15 g * C * (27.1°C - 98°C)
C = 0.83 J/g°C
Answer:
1. Heat always flow from a region of higher temperature to a lower temperature, just like concentration gradient. So in this case, since the metallic sphere is hotter than water, so naturally heat energy flows from the metallic sphere to the water.
2. We use the formula:
Q = m C ∆T
where Q is the heat energy gained, m is mass of water, C is heat capacity of water = 4.184 J/g°C and ΔT is change in temperature
Since density of water is 1 g/mL, so mass is also 100g, therefore:
Q = 100 g * 4.184 J/g°C * (27.1°C - 25°C)
Q = 878.64 J
3. Heat gained by the water is equal to the heat lost by the metal, therefore:
Q(water) = - Q(metal)
878.64 J = - 15 g * C * (27.1°C - 98°C)
C = 0.83 J/g°C
Explanation:
Who was the first to state the concept of an atom?
Answer:
The answer would be D. Democritus.
Explanation:
He was the first to state the concept of an atom.
Where are the alkali metals, the alkaline earth metals, the halogens, and the noble gases located on the periodic table?
The alkali metal, the alkaline earth metals, the halogens, and the noble gases are located in the periodic table in group 1, group 2, group 17, and group 18 respectively.
What is the periodic table?The periodic table is a tabular display of chemical elements. The periodic table is a graphic formulation of the periodic law, which states that the physical and chemical properties of the chemical elements are the periodic functions of their atomic numbers.
The table is arranged in horizontal rows called periods, and the vertical columns are called groups. Elements in the same column group of the periodic table show identical chemical characteristics.
The nonmetallic character increases from left to right in a period, and from down to up across a group, and the metallic character increases in the opposite direction.
The alkali metal and the alkaline earth metals are the elements of the s-block while the halogens and the noble gases are placed in the p-block.
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A scientist has two solutions, which she has labeled solution a and solution
b. each contains salt. she knows that solution a is 65% salt and solution b is 80% salt. she wants to obtain 120 ounces of a mixture that is 70% salt. how many ounces of each solution should she use?
To create a 120-ounce mixture that is 70% salt using Solution A (65% salt) and Solution B (80% salt), the scientist needs to mix 40 ounces of Solution A with 80 ounces of Solution B.
To solve this problem involving solution mixture, we can use the concept of the weighted average to find how many ounces of Solution A and Solution B are needed to create a new solution of desired concentration.
Let the amount of Solution A to be used be x ounces and the amount of Solution B be 120-x ounces.
Set up the equation considering that Solution A is 65% salt and Solution B is 80% salt, and we want a final mixture that is 70% salt of 120 ounces total.
The equation to be solved is 0.65x + 0.80(120-x) = 0.70(120).
Simplify and solve the equation for x.
Substitute x back into 120-x to find the amount of Solution B needed.
In this case, solving the equation gives us x = 40 ounces of Solution A and 120-x = 80 ounces of Solution B needed to achieve the 70% salt mixture.
The circled areas are called coronal mass ejections solar flares solar wind sunspots . They are cooler than hotter than the same temperature as the surrounding area.
A family of elements that has two electrons in its outer energy level is the
How do the number of valence electrons an element has change from column to column?
Answer:
Increases by an unit.
Explanation:
The periodic table refers to the table in which the chemical elements are arrangement in the increasing order of their atomic number (Z). This table contains 18 vertical columns, known as groups and 7 horizontal rows, called columns.
As we move across the period, i.e. left to right from one column to another; the number of valence electrons in the valence shell of a chemical element progressively increases by an unit.
Which metallic element may be considered as the periodic table's "cruel joke", and why?
When metals form ions, they tend to do so by 1. losing electrons and forming positive ions 2. losing electrons and forming negative ions 3. gaining electrons and forming positive ions 4. gaining electrons and forming negative ions?
Answer:
1. losing electrons and forming positive ions
Explanation:
Metals form ions by losing electrons. They do it because they have few electrons in their outermost shells. So rather than accept more electrons, it is much more feasible to lose the few electrons and achieve the octet configuration.
With this alone, we know that options 3 and 4 are incorrect.
When metals lose electrons, the type of ion formed is a positive ion because the total number of protons (positive) would be more than the total number of electrons (negative) present.
For example in Ca²⁺;
Calcium loses 2 electrons. The charge however shows +2. This is because there are 20 protons and 18 electrons in the ion now, so 20 -18 = +2
The correct option is option 1. losing electrons and forming positive ions.
how many moles are in 68.4 grams of neon?
Does c3h6clf conduct electricity when dissolved in water
Which of the following examples demonstrates acceleration? Question 17 options: A boy running at a constant speed across the street. A car traveling at 60 mph turns left around a curve. A horse standing in a pasture. A track star is maintaining the same speed as he crosses the finish line.
A 0.784 g sample of magnesium is added to a 250 ml flask and dissolved in 150 ml of water. magnesium hydroxide obtained from the reaction required 215.0 ml of 0.300 m hydrochloric acid to completely react. how many moles of hcl were used?
A lot of values are given but we must focus only on HCl.
There are 215 mL (0.215 L) of 0.300 M HCl that was completely used. We must remember the moles is simply the product of volume and molarity, that is:
number of moles = 0.215 L * 0.300 M
number of moles= 0.0645 moles HCl
The wavelength of some yellow light is 580.0 nm. What is the frequency of this yellow light?
The frequency of yellow light of wavelength 580 nm is [tex]\boxed{{0.05172\times10^{18}}\text{Hz}}[/tex]
Further Explanation:
Wavelength is the characteristic property of a wave. The term wavelength is defined as the distance between two successive crests or troughs in a wave. It is represented by [tex]\lambda[/tex] and its SI unit is meter (m).
The term frequency is defined as the number of times n event occurs in unit time. It is generally applied to waves including light, sound and radio waves. It is denoted by [tex]{\text{v }}[/tex] and its SI unit is Hertz (Hz).
The conversion factor to convert nm to m is,
[tex]1\;{\text{nm}}={10^{ - 9}}\;{\text{m}}[/tex]
The wavelength and frequency of light are related to each other by the following expression,
[tex]{\text{c}} = {v\lambda}[/tex] ......(1)
Here,
C is the speed of light.
[tex]v[/tex] is the frequency of light.
[tex]\lambda[/tex] is the wavelength of light.
Rearrange equation (1) to calculate the frequency of light.
[tex]v=\dfrac{c}{\lambda}[/tex] ......(2)
The wavelength of yellow light is 580 nm.
Firstly, wavelength of yellow light is to be converted from nm to m as follows:
[tex]\begin{aligned}{\text{Wavelength of yellow light }}\left({\text{m}}\right)&=\left( {{\text{580 nm}}}\right)\left({\frac{{{{10}^{ - 9}}\;{\text{m}}}}{{1\;{\text{nm}}}}}\right)\\&=58\times {10^{ - 10}}\;{\text{m}}\\\end{aligned}[/tex]
The speed of yellow light is [tex]3 \times {10^8}\;{\text{m/s}}[/tex].
The wavelength of yellow light is [tex]58\times {10^{ - 10}}\;{\text{m}}[/tex].
Substitute these values in equation (2)
[tex]\begin{aligned}{v }}&=\frac{{{\text{3}}\times{\text{1}}{{\text{0}}^8}\;{\text{m/s}}}}{{58 \times{{10}^{ - 10}}\;{\text{m}}}}\\&=0.05172\times{\text{1}}{{\text{0}}^{18}}\;{\text{Hz}}\\\end{aligned}[/tex]
So the frequency of yellow light is [tex]{\mathbf{0}}{\mathbf{.05172 \times 1}}{{\mathbf{0}}^{{\mathbf{18}}}}\;{\mathbf{Hz}}[/tex].
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Structure of the atom
Keywords: frequency, wavelength, yellow light, 580 nm, crests, troughs, speed of light, wavelength of light, frequency of light, conversion factor, Hz, m.
The frequency of this yellow light with wavelength, 580.0 nm is; 5.2 × 10¹⁴ Hz.
According to the question:
The wavelength of the yellow light is 580.0 nm.By convention, the speed of light (photons), c = 3×10⁸ m/s.We must also establish the relationship between the speed, wavelength and frequency as follows;
c = f × λ
Therefore, f = c/λ
where,
c = speed of lightf = frequencyλ = wavelength.However, 580nm = 580 × 10^-⁹ m = 5.8 × 10-⁷m
Since, 1nm = 10^-9mConsequently, the frequency, f of this yellow light is;
f = 3×10⁸/5.8 × 10^-⁷f = 5.2 × 10¹⁴ Hz.Read more:
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How many moles of n are in 0.225 g of n2o?
The moles of N atom in 0.225 g of N2O is 10.2 x 10⁻³ moles.
What are moles?Moles is defined as a standard scientific unit for measuring large quantities in measuring small entities such as atoms, molecules and other specified particles. It can also be defined as unit of amount of substance.
Atoms are defined as smallest unit into which matter can be divided without release of electrically charged particles.
The given mass of N2O = 0.225 g
The molar mass o N2O = 44.013 g/mole
So, the number of mole of nitrous oxide in 0.225 g of nitrous oxide
= 0.225 / 44.013 = 5.11 x 10⁻³ moles
The number of nitrogen present in 5.11 x 10⁻³ moles of nitrous oxide
= 5.11 x 10⁻³ x 2 = 10.2 x 10⁻³ moles
Thus, the moles of N atom in 0.225 g of N2O is 10.2 x 10⁻³ moles.
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There are 0.01022 moles or 10.2 x 10⁻³ moles of nitrogen in 0.225 g of N₂O.
To calculate the moles of nitrogen in 0.225 g of N₂O, we determined the molar mass of N₂O, found the moles of N₂O, and then calculated the moles of N based on its molecular composition.
There are 0.01022 moles of nitrogen in 0.225 g of N₂O.To find the number of moles of nitrogen (N) in 0.225 g of N₂O, we need to follow these steps:
Find the molar mass of N₂O.Calculate the moles of N₂O in 0.225 g.Determine the moles of N in N₂O.Step-by-Step Solution
The molar mass of N₂O (N₂O has two nitrogen atoms and one oxygen atom):Therefore, there are 0.01022 moles or 10.2 x 10⁻³ moles of nitrogen in 0.225 g of N₂O.
00 ml of 0.425 m h2so4 solution is required to completely neutralize 23.9 ml of koh solution. what is the molarity of the koh solution
00 mL? I believe that you have erroneously pasted the question here.
Anyway, let us continue computing for the molarity of KOH but i will just use a variable “A” for the volume of H2SO4 solution.
The complete balanced reaction is:
H2SO4 + 2KOH --> K2SO4 + 2H2O
We see that 2 moles of KOH is needed for every mole of H2SO4. So calculate the moles of H2SO4.
moles H2SO4 = 0.245 M * (A / 1000) = 2.45x10^-4 A
So the number of moles of KOH is:
moles KOH = 2.45x10^-4 A * 2
moles KOH = 4.90x10^-4 A
So the molarity of KOH is:
Molarity KOH = 4.90x10^-4 A / (0.0239 L)
Molarity KOH = 0.0205 * A
Simply multiply 0.0205 by the correct volume of H2SO4 in ml
If I have 6.02 x 10^23 atoms of silicon, how many grams of silicon do I have?
Final answer:
To determine the mass of silicon from the given number of atoms, we use Avogadro's number and the molar mass of silicon. One mole (6.02 × 1023 atoms) of silicon has a mass of about 28.0855 grams.
Explanation:
The question involves determining the mass of silicon given a number of atoms of silicon. We know that one mole of atoms is equivalent to Avogadro's number (6.022 × 1023 atoms). The mass of one mole of a substance is its molar mass, which for silicon is approximately 28.0855 grams. Therefore, if you have 6.02 × 1023 atoms of silicon, you have one mole of silicon, which weighs about 28.0855 grams.
Consider the chemical reaction in equilibrium.
H2 + I2 + heat ⬄ 2HI
What will happen to the chemical equilibrium if the temperature of the system is increased?
A)The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
B)The chemical equilibrium will not be affected by an increase in temperature.
C)The direction of the chemical equilibrium will shift to the left, favoring the reverse reaction.
D) The chemical equilibrium will be lost permanently with a change of temperature.
Answer: A) The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
Explanation: Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.
This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
For the given equation:
[tex]H_2+I_2+heat\rightleftharpoons 2HI[/tex]
This is a type of Endothermic reaction because heat is absorbed in the reaction.
On increasing the temperature, according to the Le-Chatelier's principle, the equilibrium will shift in the direction where decrease in temperature occurs. As this is an endothermic reaction, the temperature is decreasing in forward direction as heat is being absorbed.
Thus on increasing the temperature the reaction will shift in the right and rate of forward direction will increase.
Answer:
A) The direction of the chemical equilibrium will shift to the right, favoring the forward reaction.
Explanation:
If a sample is thought to be several million years old, which method would best help to determine its absolute age?
A. C-14/C-12
B. Ar-40/K-40
C. Pb-206/U-238
What element has its 7 valence electrons in energy level 4 in s and p orbitals?
The carbon atoms in large complex molecules are bonded to other atoms with
The p block of the periodic table includes the elements in _______.
a. groups 3a through 8a
c. inner transition metals
b. transition metals
d. groups 1a and 2a
How many lithium ions are present in 30.0 ml of 0.600 m li2co3 solution?
To calculate the number of lithium ions, we need to determine the number of moles of Li2CO3 and then multiply it by 2 (since there are 2 lithium ions for every 1 formula unit of Li2CO3). The number of lithium ions is 0.0360 mol.
Explanation:To determine the number of lithium ions present in the solution, we need to first calculate the number of moles of Li2CO3 using the given concentration and volume. From the formula Li2CO3, we can see that there are 2 lithium ions for every 1 formula unit of Li2CO3. Therefore, we can multiply the number of moles of Li2CO3 by 2 to calculate the number of lithium ions.
First, we need to calculate the number of moles of Li2CO3:
Moles of Li2CO3 = concentration (mol/L) × volume (L)
Moles of Li2CO3 = 0.600 mol/L × 0.0300 L = 0.0180 mol
Since there are 2 lithium ions for every 1 formula unit of Li2CO3:
Number of lithium ions = 2 × moles of Li2CO3 = 2 × 0.0180 mol = 0.0360 mol
Therefore, there are 0.0360 moles of lithium ions present in 30.0 mL of 0.600 M Li2CO3 solution.
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Aspirin tablets contain the active ingredient (aspirin) and various inactive ingredients. Suggest what types of inactive ingredient could be present, and what their purpose might be.
Inactive ingredients in aspirin tablets, such as fillers, binders, and buffering agents, help in maintaining the structure of the tablet, extending shelf life, and minimizing side effects, among other functions.
Inactive ingredients in aspirin tablets serve various functions, such as binders, which hold the tablet together, and fillers like starch, which add bulk to the tablet making it easier to handle. Other potential inert ingredients may include disintegrants to help the tablet break down after ingestion, preservatives to extend shelf life, and buffering agents such as MgO, especially in buffered aspirin forms, to minimize acidic side effects. In some cases, there may be coating agents to protect the stomach lining or to control the release rate of the aspirin, flavoring agents to improve taste, and colorants for tablet identification. The choice of these additives depends on the intended use, manufacturing process, and desired properties of the final product.
Most acids ionize in solution, and most bases _____ in solution.
ionize
disperse
dissociate
vaporize