Answers
Answer:
Ionization
Melting
Vaporization
Explanation:
▶Ioniztion changes the charge of an electron, this usually happens between a chemical reaction. It takes a small amount of energy. Most of the time energy is absorbed instead of expelled!
▶ Melting changes the shape of the item and takes about 334 Joules/gram of energy.
▶ Vaporization changes the state of matter that the item is in and requires 2260 Joules/gram.
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Related Questions
What does the chemical formula CaCl2 show about the compound it represents? It is made up of one element. It is made up of two elements. It is made up of three elements. It is made up of four elements.
Answers
Answer:
2
Explanation:
not 100%sure hehe
The compound calcium chloride with the formula CaCl₂ has two elements namely, calcium and chlorine. Hence, option b is correct, the compound is made of 2 elements.
What is a compound ?A compound is a chemical substance which is made by the combination of atoms of two or more elements. The bonding type of this elements differ from compound to compound.
Calcium chloride is an ionic compound formed by the electron transfer from calcium to chlorine. The two electrons of the valence shell of Ca is donated to each chlorine atoms.
The number of elements in this compound is thus 2, which are calcium and chlorine. There are three atoms in one calcium chloride molecule. One of calcium and two atoms of chlorine. Hence, option b is correct.
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we can consider a liquid-liquid extraction to be efficient if >90% of the desired compound can be recovered. presuming (i) the desired compound is soluble in the organic solvent and (ii) we use equal volumes of the organic solvent and water, what is the minimum value of the partition coefficient (k) to get an efficient extraction with only one extraction step (i.e. only mixing the organic solvent and water once, without further extractions using fresh portions of organic solvent)?
Answers
The minimum value of the partition coefficient (k) to get an efficient extraction with only one extraction step is 1.8.
To answer your question, we need to understand the concept of partition coefficient (k). Partition coefficient (k) is the ratio of the concentration of a solute in the organic phase to its concentration in the aqueous phase at equilibrium. It is a measure of the solubility of a solute in a particular solvent system.
Now, to get an efficient extraction with only one extraction step, we need to ensure that more than 90% of the desired compound is recovered. Given that the desired compound is soluble in the organic solvent and we use equal volumes of the organic solvent and water, the minimum value of the partition coefficient (k) can be calculated using the following formula:
k = [concentration of the desired compound in the organic phase] / [concentration of the desired compound in the aqueous phase]
To achieve an efficient extraction with only one extraction step, we need to ensure that more than 90% of the desired compound is extracted into the organic phase. This means that the concentration of the desired compound in the organic phase should be at least 90% of the initial concentration of the compound. Assuming equal volumes of the organic solvent and water are used, this can be represented as:
[concentration of the desired compound in the organic phase] >= 0.9 x [initial concentration of the desired compound]
Similarly, the concentration of the desired compound in the aqueous phase can be represented as:
[concentration of the desired compound in the aqueous phase] = [initial concentration of the desired compound] / 2
Substituting these values in the formula for k, we get:
k >= (0.9 x [initial concentration of the desired compound]) / ([initial concentration of the desired compound] / 2
Simplifying the expression, we get:
k >= 1.8
In summary, for an efficient extraction with only one extraction step, we need to ensure that the desired compound is soluble in the organic solvent and the partition coefficient (k) is equal to or greater than 1.8.
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factorise the following expressions.
1) x3 + 8y3
2) 8x3-27y3
3) a3-8b3
4) 8a3+27b3
5) a3-64
Answers
Answer:
Explanation:
Both are cubes so
1.(x + 2y)
2.(2x - 3y)
3. (a - 2b)
4. (2a + 3b)
5. (a - 4)
What are all the elements in a column called? NO LOOKING IT UP and if u do put it in ur words
Answers
Answer:
There have been seven horizontal rows of elements are called phases in the periodic table of elements. Groups, or families, are called vertical columns of elements. Metals, – anti, and metals are the most common ways of classifying the periodic table.
Explanation:
What is the half-life (in seconds) of a zero-order reaction which has an initial reactant concentration of 0. 934 M with a k value of 5. 43 × 10–2 M/s?
Answers
The period in which half of the reactant (half-life) has typically already reacted is 8.61 seconds for a zero-order reaction.
The rate law for a zero-order reaction is rate = k[A]⁰ = k, where [A]⁰ is the reactant concentration and k is the rate constant.
Half-life is the amount of time it takes for a reaction's reactant to react or degrade in half. A zero-order reaction's half-life is determined by:
\(t_{1/2}\) = [A]₀/2k, where
[A]₀ = reactant's initial concentration, and k is the rate constant.
Inputting the values provided yields:
[A]₀/2k
= 0.934 M / (2 x 5.43 x 10⁻² M/s)
As a result, the reaction's half-life is 8.61 seconds.
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How many significant figures does 5.750 have?
Answers
Answer:
4
Explanation:
Which of the following is an example of chemical energy?
Select one:
a hot metal pan
a light bulb
a burger & fries
an empty bowl
Answers
a light bulb is the example of chemical energy
Answer:
a light bulb
Explanation:
Please try and help me understand what the answer would be and how to get the answer for specifically what is S for silicon tetrachloride, SiCI4?
Answers
Answer
Explanation
In the Lewis Dot structure, S = N - A is used to calculate the total number of shared and unshared electrons in a molecule.
S represents the TOTAL number of valence shared electrons in a molecule to achieve an octet, N represents the sum of the number of valence electrons of all the atoms of the molecule, and A is the number of valence electrons in an electron pot.
For SiCl₄, the valence electron on each atom coming together to form the molecule is:
Valence electron on Si = 4
Valence Electron on Cl = 7
Total valence electron on SiCl₄ = 4 + (4 x 7) = 32
The least electronegative Si atom is placed at the center, and four Cl atoms are connected with a single bond.
A single bond takes up 2 valence electrons, so for four bonds, 8 valence electrons have been occupied, and we are left with 32 - 8 = 24 valence electrons.
Thus, in the Lewis Dot structure S = N - A , the TOTAL number of valence electrons in a molecule to achieve an octet of SiCl₄ to achieve an octet is
Which statement best compares the energy and frequency of green waves to orange waves?
Green waves have a lower frequency and contain less energy than orange waves.
Green waves have a higher frequency and contain more energy than orange waves.
Orange waves have a higher frequency and contain less energy than green waves.
Orange waves have a lower frequency and contain more energy than green waves.
Answers
Orange waves have a lower frequency and contain less energy than green waves.
What is Wave?
A wave is a disturbance or oscillation that travels through space and time, accompanied by the transfer of energy without the transfer of matter. Waves can take many different forms, including sound waves, light waves, water waves, and seismic waves. They can be described in terms of their frequency, wavelength, amplitude, and velocity, among other properties. Waves play a fundamental role in many areas of science and technology, including communication, medicine, and engineering.
The energy of a wave is directly proportional to its frequency, which means that higher frequency waves contain more energy than lower frequency waves. The frequency of a wave refers to the number of complete cycles or oscillations that the wave undergoes per second, and is measured in units of Hertz (Hz).
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How many grams of h3po3 would be produced from the complete reaction of 93.2 g p2o3
Answers
Answer: 137.76 g
Explanation:
Arrange the members of each of the following sets of cations in order of increasing ionic radii. (a) K+, Ca2+, Ga3+, (b) Ca2+, Be2+, Ba2+, Mg2+, (c) Al3+, Sr2+, Rb+, K+, (d) K+, Ca2+, Rb+
Answers
The cations in order of increasing ionic radii are:
(a) Ga3+ < Ca2+ < K+
(b) Be2+ < Mg2+ < Ca2+ < Ba2+
(c) Al3+ < Sr2+ < K+ < Rb+
(d) Ca2+ < K+ < Rb+
It is because moving down the group in the periodic table, the ionic radii typically increase, and as the charge of a cation increases, the ionic radii typically decrease.
In the first series, the charge of a cation increases, and so the ionic radii decrease from potassium to calcium to gallium.
In the second series, the ionic radii typically increase moving down the group from Beryllium to Magnesium to Calcium and then Barium.
In the third and final series also the ionic radii increase as the charge of a cation increases or one moves down the group from potassium to rubidium.
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You order a glass of lemonade, 150 mL, in a restaurant only to discover that it is warm and too sweet. The sugar concentration of the lemonade is 2.27 M but you would like it to be reduced to a concentration of 1.88 M.How many grams of ice should you add to the lemonade, knowing that only a third of the ice will melt before you take your first sip? (Assume the density of water is 1.00 g/mL)
Answers
Since no sugar will be added or removed, the number or moles of it in the glas won't change.
Let's call this quantity:
\(n_s\)The molar concetrnation can be written as the followin equation:
\(C=\frac{n_s}{V}\)Where C is the concentration given the number of moles of sugar and the volume V.
We can rewrite this as:
\(n_s=C\cdot V\)Now, before the ice melts, the volume of the lemonate is 150 mL and the sugar concentration is 2.27 mol/L. Let's call this situation 1:
\(n_s=C_1\cdot V_1\)After the ice melt the one third it will, we will have a certain volume and the concentration we want 1.88 mol/L. Let's call this situation 2:
\(n_s=C_2\cdot V_2\)Now, we can put thouse tofether:
\(\begin{gathered} n_s=n_s \\ C_1\cdot V_1=C_2\cdot V_2 \end{gathered}\)And we can solve for the unknown volume of situation 2:
\(V_2=\frac{C_1\cdot V_1}{C_2}=\frac{2.27M\cdot150mL}{1.88M}=\frac{340.5}{1.88}mL=181.117\ldots mL\approx181mL\)Since the final volume is approximately 181 mL, the difference between it and the initial volume is the volume of water that came from the melted part of the ice:
\(181mL-150mL=31mL\)Since we assume that the density of the water is 1.00 g/mL, we can calculate the mass it represents:
\(\begin{gathered} \rho=\frac{m}{V}_{} \\ m=\rho\cdot V=1.00g/mL\cdot31mL=31g \end{gathered}\)And since this is only 1 third of the ice (the rest won;t melt), we know that the whole ice will have three times this mass:
\(m_{ice}=3\cdot31g=93g\)So, it should be added approximatelt 93 grams of ice.
for each of the following pairs of solutes and solvent, predict whether the solute would be soluble or insoluble.
Answers
However, you haven't mentioned the pairs of solutes and solvents. A solvent is a substance that dissolves another substance to form a solution. The solubility of a substance in a solvent is affected by factors like temperature, pressure, and the nature of the solute and solvent.
Kindly provide the pairs so that I can assist you further.What is solubility Solubility is the ability of a substance to dissolve in a solvent to form a homogeneous solution. However, you haven't mentioned the pairs of solutes and solvents.
A solvent is a substance that dissolves another substance to form a solution. The solubility of a substance in a solvent is affected by factors like temperature, pressure, and the nature of the solute and solvent.
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which element on the periodic table has the highest electronegativity
Answers
Answer:
fluorine
Explanation:
Electronegativity varies in a predictable way across the periodic table. Electronegativity increases from bottom to top in groups, and increases from left to right across periods. Thus, fluorine is the most electronegative element, while francium is one of the least electronegative
Help me with these two please & thank you !
Answers
The heat of the reaction is 90.83 kJ/mol.
The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.
It is given by the formula -
Q = mcΔT
where, Q = amount of heat
m = mass
c = specific heat
ΔT = Change in temperature
Heat of formation is the opposite of heat of reaction.
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You examined the effects of heat on equilibrium in part iv. Was the reaction you observed endo- or exo- thermic? does heat act as a reactant or product? what happened when you removed heat by placing the solution in the ice bath? what would you expect to happen if you were to add heat?.
Answers
1) The reaction is exothermic and heat is a product
2) The color would turn to pink.
What is an endothermic reaction?Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.
If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.
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how do valence electrons determine the reactivity of an element?
Answers
Answer:
the number of valence electrons also determines whether they tend to give up or gain electrons in chemical reactions.
Name the following bonds:
1. calcium
2. rubidium iodide
3. nickel (IV) selenide
Answers
Answer:
Ionic bondIonic bondIonic bondExplanation:
1) Calcium = ?
→ Ca will constitute to form ionic bond.
2) Rubidium iodide = ?
→ Rubidium iodide will form ionic bond.
3) Nickel (IV) selenide = ?
→ Nickel (IV) selenide forms ionic bond.
what device has made car emissions much cleaner?
automatic transmission
better wheels
tail pipes
catalytic converters
Answers
Answer:
automatic transmission
Explanation:
An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in motor vehicles that does not require any driver input to change gears under normal driving conditions.
A first interview may be given and the candidate rated from 1 to 5 on whatever factors are considered relevant to successful job performance. This is the __________ approach.
Answers
The given approach, where a first interview is conducted and the candidate is rated from 1 to 5 based on relevant factors for successful job performance, is an example of the ordinal scale approach.
What is ordinal scale approach?
In the ordinal scale approach, values or categories are assigned to observations or individuals based on their relative positions or rankings. In this case, the candidate's performance is assessed and rated on a scale of 1 to 5, indicating their relative standing in terms of the factors considered relevant to successful job performance.
The use of numerical ratings allows for differentiation and comparison between candidates, but the specific numerical values do not carry any inherent quantitative meaning. Instead, they represent the ordering or ranking of the candidates' performance levels.
By using an ordinal scale approach, interviewers can provide a systematic assessment and ranking of candidates based on the relevant factors, helping to facilitate decision-making in the hiring process.
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Which factor most often affects wind and weather patterns on Earth?
Answers
Answer:
i think its solar radiation
what are the correct coefficients if the law of conservation of mass is applied to the decomposition of solid ammonium nitrite to nitrogen gas and liquid water?
Answers
The correct equations for the breakdown of solid ammonium nitrite to nitrogen gas and liquid water under the law of conservation of mass would be 1 mol of solid ammonium nitrite to 1 mol of nitrogen gas and 1 mol of liquid water.
Since matter cannot be generated or destroyed, according to the rule of conservation of mass, the total mass of the reactants and products in a chemical process must remain constant. The balanced chemical equation for the breakdown of solid ammonium nitrite is:
NH4NO2(s) N2(g) + H2O (l)
The coefficients in this equation stand for the ratio of moles of each reactant and product. According to the factors 1, 1, and 1, 1 mol of nitrogen gas and 1 mol of liquid water are created for every 1 mol of solid ammonium nitrite that is broken down. As required by the rule of conservation of mass, this indicates that the combined mass of the reactants and products remains constant.
Ammonium nitrite ,\($\mathrm{NH} 4 \mathrm{NO}$\), will decompose to yield nitrogen gas and water Vapor by the following equation:
\(\mathrm{NH}_4 \mathrm{NO}_2(s) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(\mathrm{g})+\mathrm{N}_2(g)\)
What is a decomposition reaction?
A decomposition reaction can be defined as a chemical reaction in which one reactant breaks down into two or more products.
Ammonium nitrite, \($\mathrm{NH} 4 \mathrm{NO} 2$\), will decompose to yield nitrogen gas and water Vapor by the following equation:
\(\mathrm{NH}_4 \mathrm{NO}_2(s) \rightarrow 2 \mathrm{H}_2 \mathrm{O}(g)+\mathrm{N}_2(g)$$\)
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what is saturated solution?12
Answers
Answer:
A solution in which the maximum amount of solvent has been dissolved
Explanation:
For example, 36g of salt in 100g of water.
2) An electron cloud
a) represents a 50% probability of finding an electron
b) has uniform density
c) can be called an orbital
d) can only show where the electrch is not located
Answers
Explanation:
d because black bla black bla
How many moles of chloroethylene (C2H3Cl) contain 5.47 × 1026 molecules?
Answers
5.47 × 1026 molecules of chloroethylene (C2H3Cl) contain 9.10 × 103 moles.
The given number of molecules is 5.47 × 1026.
We have to calculate the moles of chloroethylene (C2H3Cl) containing these molecules.
A mole is a standard unit used to measure the number of particles like atoms, molecules, or ions.
It is defined as the number of particles in 12 grams of pure carbon-12.
This number is also called Avogadro's number and is equal to 6.022 × 1023.
The conversion of molecules to moles is given by:moles = molecules / Avogadro's numberMolecular mass of C2H3Cl = (2 × 12.01 g/mol) + (3 × 1.01 g/mol) + 35.45 g/mol= 64.53 g/mol.
Now, we can calculate the moles of chloroethylene (C2H3Cl) containing the given number of molecules as follows: moles = molecules / Avogadro's number= 5.47 × 1026 / 6.022 × 1023= 9.10 × 103 moles.
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What are the reactants of photosynthesis?
Answers
Answer:
The photosynthesis chemical equation states that the reactants (carbon dioxide, water and sunlight), yield two products, glucose and oxygen gas. The single chemical equation represents the overall process of photosynthesis.
Explanation:
Round off the following quantities to the number of significant figures indicated in parentheses: 69.733 g (2)
Answers
Answer:
70
Explanation:
There are 5 significant figures in the problem. Since it has a decimal point, we start on the left hand side and work our way to the right. You would end up at 69, but then you have to round up since the next number is a 7, which is greater than or equal to 5.
For a certain polyatomic ideal gas the value of its ideal gas constant is 0.123 kJ/(kg.K). Determine a) its molecular weight (W);
Answers
The molecular weight (W) of the polyatomic ideal gas is equal to the temperature (T) divided by the volume (V) calculated as 0.123 kJ/(K).
The molecular weight (W) of the polyatomic ideal gas can be determined using the ideal gas equation:
PV = mRT
where:
P = pressure of the gas (in this case, it is not given)
V = volume of the gas (in this case, it is not given)
m = mass of the gas (in kilograms)
R = ideal gas constant (0.123 kJ/(kg.K))
T = temperature of the gas (in Kelvin)
To calculate the molecular weight (W), we need to find the value of m. Since the pressure and volume are not provided, we can rearrange the ideal gas equation as follows:
m = PV / (RT)
Now, let's assume a hypothetical situation where we have 1 kg of the polyatomic ideal gas. In this case, the mass (m) would be equal to 1 kg.
Substituting the values into the equation:
m = (1 kg) * V / (0.123 kJ/(kg.K) * T)
Here, we can see that the units of kilograms (kg) cancel out, leaving us with:
1 = V / (0.123 kJ/(K))
To isolate V, we multiply both sides of the equation by 0.123 kJ/(K):
0.123 kJ/(K) = V
Now, we have the volume (V) in cubic meters. The molecular weight (W) can be calculated using Avogadro's law, which states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules.
To calculate the molecular weight (W), we need to determine the number of moles (n) of the gas. The number of moles can be found using the equation:
n = PV / (RT)
However, since the pressure and volume are not provided, we cannot calculate the number of moles directly. Instead, we can make use of the molar mass (M) of the gas, which is the mass of 1 mole of the gas.
The molar mass (M) is related to the molecular weight (W) as follows:
M = W / 1000
Since we assumed a mass of 1 kg earlier, the molar mass (M) can be calculated as:
M = (1 kg) / n
Substituting the value of n from the equation above:
M = (1 kg) / (PV / (RT))
M = RT / PV
Now, substituting the value of R (0.123 kJ/(kg.K)) and rearranging the equation:
M = (0.123 kJ/(kg.K)) * T / (0.123 kJ/(K) * V)
The units of kJ cancel out, leaving us with:
M = T / V
Using the value of V we calculated earlier (0.123 kJ/(K)), we can determine the molecular weight (W) of the polyatomic ideal gas.
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How many grams of water are in 1.8 mole of MgSO4+ 7H2O
Answers
which beaker(s) contain(s) a solution that is hypertonic to the bag? select all that apply. which beaker(s) contain(s) a solution that is hypertonic to the bag?select all that apply. a dialysis bag submerged in a beaker of solution. the beaker is labeled as having a 0.4 molar solution, and the bag is labeled as having a 0.2 molar solution. a dialysis bag submerged in a beaker of solution. the beaker is labeled as having a 0.2 molar solution, and the bag is labeled as having a 1.0 molar solution. a dialysis bag submerged in a beaker of solution. the beaker is labeled as having a 0.2 molar solution, and the bag is labeled as having a 0.2 molar solution. a dialysis bag submerged in a beaker of solution. the beaker is labeled as having a 0.6 molar solution, and the bag is labeled as having a 0.2 molar solution.
Answers
The beaker with a 0.6 molar solution is hypertonic to the bag with a 0.2 molar solution.
When a cell is placed in a solution with a higher solute concentration, the solution is hypertonic to the cell. This means that there is a net movement of water from the cell into the solution, causing the cell to shrink or even collapse. In the context of the given scenario, the dialysis bag is filled with a 0.2 molar solution, and it is placed in four different beakers with solutions of different molarities.
The beaker with a 0.4 molar solution is isotonic to the dialysis bag, which means that the solute concentration is the same inside and outside the bag. Thus, there is no net movement of water into or out of the bag.
The beaker with a 0.2 molar solution is also isotonic to the bag. Therefore, there will be no net movement of water.
The beaker with a 1.0 molar solution is hypertonic to the dialysis bag. Thus, there is a net movement of water from inside the bag to the surrounding solution, causing the bag to shrink.
The beaker with a 0.6 molar solution is hypertonic to the bag. Therefore, there is a net movement of water from inside the bag to the surrounding solution, causing the bag to shrink.
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