What do you call a substance that can only be separated into two or more simpler substances using chemical changes?
Answers
Answer:
Compounds are substances composed of two or more elements chemically combined that can be separated into simpler substances only by chemical means. Water, for example, is a compound because pure water is composed of only H2O molecules.
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Related Questions
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Select the correct answer.
Which bond theory can easily predict magnetic and ionization properties?
A valence bond theory
В. molecular orbital theory
C. modern valence bond theory
D both molecular orbital and valence bond theories
Answers
Answer:
b molecular orbital therory
Question is in photo! Will give BRAINLIEST to whoever answers correctly first!
Answers
Answer:
A new element
Explanation:
As you add mopre and more protons and electrons and neutrons it keeps on crating new.
Assuming the electronegativity of the atoms in methyl bromide are: C = 2.5, H = 2.1, and Br = 2.8, which bond is the most polar? a. C-H b. C-Br c. they are equal
Answers
The electronegativity of the atoms in methyl bromide are: C = 2.5, H = 2.1, and Br = 2.8, the more polar bond is C-H. Option A is correct.
The polarity of a bond is determined by the difference in electronegativity between the two atoms involved. The greater the difference in electronegativity, the more polar the bond.
In methyl bromide (CH₃Br), there are three C-H bonds and one C-Br bond. The electronegativity values of C, H, and Br are 2.5, 2.1, and 2.8, respectively.
The electronegativity difference between C and H is 0.4 (2.5 - 2.1), while the electronegativity difference between C and Br is 0.3 (2.8 - 2.5).
Therefore, the C-H bond is more polar than the C-Br bond in methyl bromide.
Hence, A. C-H is the correct option.
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What is the p value for the following scenario: Out of 300 male inpatients, there are 195 that have a MCC and out of 450 female inpatients 205 have a MCC. Question 4 options: .A. 49
B.53
C.59
D.50
Answers
The p-value would depend on the calculated chi-square statistic and the degrees of freedom associated with the test.
To determine the p-value for the given scenario, we need to perform a statistical test, such as a chi-square test, to assess the association between gender and having a major co-existing condition (MCC).
The observed data can be summarized in a contingency table as follows:
Male 195 105
Female 205 245
To calculate the p-value, we would perform a chi-square test on this contingency table, comparing the observed frequencies to the expected frequencies under the assumption of independence between gender and MCC.
After conducting the chi-square test, the resulting p-value will indicate the probability of observing the given data or data more extreme if there is truly no association between gender and MCC.
However, without the expected frequencies or the results of the chi-square test, it is not possible to determine the exact p-value. Therefore, none of the provided options (A. 49, B. 53, C. 59, D. 50) can be considered as the correct answer. The p-value would depend on the calculated chi-square statistic and the degrees of freedom associated with the test.
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If a number in scientific notation has a POSITIVE exponent, the number in standard form will have
Answers
Positive exponent means bigger number
Negative exponent is smaller - means that its in the denominator.
example:
\(2^{2} = 4\)
\(2^{-2} =\frac{1}{2^2} = \frac{1}{4}\)
Which of the following statements is true?
A.Most meteors fall into Earth's oceans, where they cause no damage.
B.Jupiter is the only planet which rotates almost on its side.
C.Earth's blue color is the result of methane in the atmosphere.
D.Scientists believe that Mars once had water on its surface.
Answers
Answer:
d.
Explanation:
Answer:
D!
Explanation:
A is not true! When big meteors fall into the ocean, they cause mega-tsunamis I think, which does a lot of damage.
B, no, Uranus does too.
C, I think this is untrue, red wavelength and reflects the blue the blue!
D, is so true! A lot of reliable sources on this one!
Sorry if I did any wrong, I haven't learn chemistry in school yet.
An ion has 26 protons, 28 neutrons, and 24 electrons. Which element is this ion? a. Xe b. Ni c. Fe d. Mg e. Cr
Answers
The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).
An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.
This means that the number of protons in an atom is unique to a specific element.
Iron (Fe) has 26 protons in the nucleus of its atom.
Therefore, an ion with 26 protons is an ion of the element iron (Fe).
Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.
Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons is Fe (option c)
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in 400 bce, the greek philosopher democritus first proposed the idea that all matter was composed of atoms. since that time, scientists have learned that, far from resembling tiny marbles, atoms actually have very complex structures. since it has been changed so many times, why is it referred to as the atomic theory rather than the atomic hypothesis?
Answers
The term "atomic theory" is used instead of "atomic hypothesis" because it signifies the evolution and acceptance of the concept over time.
While Democritus initially proposed the idea of atoms in 400 BCE, it was merely a hypothesis without substantial experimental evidence. Over centuries, scientific investigations and advancements led to a deeper understanding of atomic structure and behavior.
The term "atomic theory" acknowledges that the concept of atoms has undergone refinement and modification based on experimental evidence and theoretical developments.
It recognizes that the understanding of atoms has evolved from a speculative hypothesis to a well-established scientific theory supported by extensive experimental observations, mathematical models, and empirical data.
The term "theory" conveys the comprehensive and validated nature of our understanding of atoms, encompassing their complex structures and behavior.
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perhaps it is unsurprising that cyclohexane and ethanol are reasonable uv solvents, whereas toluene is not. explain why that is.
Answers
Cyclohexane and ethanol are reasonable UV solvents because they have low absorption in the UV region, while toluene is not a good UV solvent because it has high absorption in the UV region.
UV spectroscopy is a technique that measures the absorption of light in the UV region. Solvents used in UV spectroscopy should have low absorption in the UV region so that they do not interfere with the measurement of the sample. Cyclohexane and ethanol have low absorption in the UV region, which makes them good UV solvents. Toluene, on the other hand, has high absorption in the UV region, which means that it will absorb the UV light and interfere with the measurement of the sample. Therefore, toluene is not a good UV solvent.
A chromophore is a part of a molecule that absorbs UV or visible light, causing the molecule to change its energy state. Solvents that are transparent to UV light, like cyclohexane and ethanol, do not contain chromophores and thus do not interfere with UV spectroscopy. Toluene, on the other hand, has a benzene ring, which is a chromophore that can absorb UV light. This absorption can interfere with UV spectroscopy, making it a less suitable UV solvent compared to cyclohexane and ethanol.
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A cell with normal tonicity is placed in a 200 mM NaCl solution. This solution is ________ and the cell will ________.
A. hypotonic : swell
B. isotonic : not change size
C. hypotonic : shrink
D. hypertonic : shrink
E. hypertonic : swell
Answers
According to diffusion, a cell cell with normal tonicity is placed in a 200 mM NaCl solution. This solution is hypotonic and will shrink.
What is diffusion?Diffusion is defined as the process of movement of molecules which takes place under concentration gradient. It helps in movement of substances in and out from the cell.The molecules move from lower concentration region to a higher concentration region till the concentration becomes equal.
There are 2 main types of diffusion:
1) simple diffusion-process in which substances move through a semi-permeable membrane without the aid of transport proteins.
2) facilitated diffusion- It is a passive movement of molecules across cell membrane from higher concentration region to lower concentration.
There are 2 types of facilitated diffusion one is osmosis and dialysis.
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what is a mixture of elements and compounds
Answers
The substance in the image above would be classified as a mixture of elements (option E).
What is a compound and mixture?A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.
On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.
According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.
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The vapour pressure of water at 20°C is 18 mm. When 20 g of a non-ionic substance is dissolved in 100 g of water the vapour pressure is lowered by 6 mm. What is the molar mass of the non-ionic substance?
Answers
The molar mass of a nonionic substance can be calculated using Raoult's law. According to the law, the vapor pressure of a solution is equal to the mole fraction of the solute multiplied by the vapor pressure of the pure solvent.
In this case, the mole fraction of the solute is 0.2 and the vapor pressure of the pure solvent (water) is 18 mm. Therefore, the vapor pressure of the solution is 0.2 x 18 = 3.6 mm. Since the vapor pressure of the solution is 6 mm lower than the vapor pressure of the pure solvent, the difference between the two is 6 - 3.6 = 2.4 mm.
According to Raoult's law, the mole fraction of the solute is equal to the mole fraction of the solvent multiplied by the difference between the vapor tension of the pure solvent and the vapor tension of the solution. Therefore, the molar mass of a nonionic substance can be calculated as follows: molar mass = 0.2 x 2.4 x 18 / 100 = 0.864 g/mol.
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How many moles is 1.8 x 1023 atoms of Be?
Answers
Answer:
3.0059572661984113e-24
Explanation:
in a titration, 12.060 ml of a 1.087 m weak acid solution are placed in a 125 ml erlenmeyer flask. a 1.114 m solution of naoh (aq) is placed in the buret and filled to the 0.00 ml mark. naoh solution is added to the flask and the buret reading is now 20.561. what is the ph of the solution?
Answers
NaOH solution is added to the flask and the buret reading is now 20.561. The pH of the solution is 9.39.
To find the pH of the solution, we need to calculate the concentration of the weak acid after it has reacted with the strong base.
First, let's calculate the number of moles of NaOH that were added to the flask:
1.114 M x (20.561 mL - 0.00 mL) = 22.931354 mmol NaOH
Since the weak acid and strong base react in a 1:1 mole ratio, we know that 22.931354 mmol of weak acid were also present in the flask
The volume of the solution in the flask is 12.060 mL, or 0.01206 L. Therefore, the concentration of the weak acid in the flask before the titration was:
1.087 M x (12.060 mL / 1000 mL) = 0.01313202 M
Now we can use the concentration of the weak acid and the amount of moles of weak acid to calculate the concentration of the weak acid after the titration:
0.01313202 M - (22.931354 mmol / 0.125 L) = 0.01126778 M
The pH of the solution can be calculated using the pKa of the weak acid:
pH = pKa + log([A-]/[HA])
We'll need to know the pKa of the weak acid to solve the problem. Let's assume the weak acid is acetic acid (CH3COOH), which has a pKa of 4.76.
Substituting the values we have:
pH = 4.76 + log([CH3COO-]/[CH3COOH])
We need to find the ratio of [CH3COO-] (conjugate base) to [CH3COOH] (weak acid).
Since we started with 0.01313202 M of CH3COOH, and the weak acid and strong base react in a 1:1 mole ratio, we know that 22.931354 mmol of CH3COOH reacted, leaving 0.009828666 mol of CH3COOH in the solution.
Since CH3COOH is a weak acid that undergoes partial dissociation in water, we can assume that [CH3COO-] = [OH-] and [CH3COOH] = [H+].
Therefore, [OH-] = [CH3COO-] = x
[H+] = [CH3COOH] = Ka/[OH-] = 1.8 x 10^-5 /
Substituting these values into the equation above:
pH = 4.76 + log(x / 0.009828666)
To solve for x, we'll need to use the quadratic formula because the dissociation of CH3COOH is not complete, making it a weak acid/base problem.
x^2 + 1.14 x 10^-5 x - 2.23 x 10^-11 = 0
Solving this equation yields
x = 5.79 x 10^-7 M
Therefore, the pH of the solution is:
pH = 4.76 + log(5.79 x 10^-7 / 0.009828666) = 9.39
Therefore, the pH of the solution is 9.39.
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72.
How many atoms are present in one mole of
water?
A)54
B)3
C)3(6.02 × 1023)
D)6.02 x 1023
Answers
Answer:
3 atoms
Explanation:
A water molecule consists of three atoms an oxygen atom and two hydrogen atoms which are bond together like little magnets
30 grams of solid HCl is dissolved into 250 mL of solution. What volume of 1.5M NaOH is
required to neutralize the HCI solution? Please show work
Answers
The volume of 1.5M NaOH required to neutralize the HCl solution is 0.549 liters.
Stoichiometric problem
From the balanced equation:
HCl + NaOH -> NaCl + H2O
We know that we have 30 grams of solid HCl, which we can convert to moles using its molar mass:
30 g HCl / 36.46 g/mol = 0.823 mol HCl
We also know that the HCl is dissolved in 250 mL of solution, which we can convert to liters:
250 mL / 1000 mL/L = 0.25 L
Now we can calculate the molarity of the HCl solution:
Molarity = moles of solute / liters of solutionMolarity = 0.823 mol / 0.25 LMolarity = 3.292 MWe want to neutralize the HCl solution with 1.5 M NaOH. To do this, we need to add enough NaOH to react completely with the HCl:
0.823 mol HCl x (1 mol NaOH / 1 mol HCl) = 0.823 mol NaOH
Now we can calculate the volume of 1.5 M NaOH required to react with the HCl:
Volume of NaOH = moles of NaOH / Molarity of NaOHVolume of NaOH = 0.823 mol / 1.5 MVolume of NaOH = 0.549 LTherefore, we need to add 0.549 liters of 1.5 M NaOH to the HCl solution to neutralize it.
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What statement is NOT true about standard electrode potentials? The electrode in any half-cell with a greater tendency to undergo reduction is positively charged relative to the standard hydrogen electrode and therefore has a positive Eº. O Eºcell is the difference in voltage between the anode and the cathode. Eºcell is positive for spontaneous reactions. The electrode potential of the standard hydrogen electrode is exactly zero Electrons will flow from more negative electrode to more positive electrode.
Answers
The incorrect statement regarding standard electrode potentials is that "The electrode in any half-cell with a greater tendency to undergo reduction is positively charged relative to the standard hydrogen electrode and therefore has a positive Eº".
This statement is incorrect because electrons flow from the more negative electrode to the more positive electrode.
This is due to the fact that the electrode with a higher tendency to undergo reduction will attract electrons more strongly and therefore have a more negative potential.
The potential difference between two electrodes can be measured and is known as the Eºcell, which is the difference between the potentials of the anode and cathode.
A positive Eºcell indicates that the reaction is spontaneous and that the electrons will flow from the anode to the cathode.
The standard hydrogen electrode is used as a reference electrode and has a potential of exactly zero.
Any half-cell with a greater tendency to undergo reduction will have a more positive potential compared to the standard hydrogen electrode.
Therefore, the electrode in any half-cell with a greater tendency to undergo reduction is negatively charged relative to the standard hydrogen electrode and therefore has a negative Eº.
The sign of the standard electrode potential (Eº) indicates the direction of electron flow, with positive values indicating a tendency to undergo reduction (gain of electrons) and negative values indicating a tendency to undergo oxidation (loss of electrons).
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The experimental value is .156 cal and the actual value is .185 cal what is the percent error
Answers
The percentage error of an experiment whose experimental and actual value are 0.156 cal and 0.185 cal respectively is 15.68%.
How to calculate percent error?Percent error is the difference between estimated value and the actual value in comparison to the actual value and is expressed as a percentage.
This means that the percentage error in an experiment can be calculated using the following formula;
Percent error = {actual value - experimental value} / actual value × 100
According to this question, the experimental value of an experiment is 0.156 cal and the actual value is 0.185 cal. The percent error can be calculated as follows:
% error = {0.185 - 0.156}/0.185 × 100
% error = 0.029/0.185 × 100
% error = 15.68%
Therefore, the percentage error of an experiment whose experimental and actual value are 0.156 cal and 0.185 cal respectively is 15.68%.
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Of the following compounds, which is the most ionic?
(a) sicl4
(b) brcl
(c) pcl3
(d) cl2o
(e) cacl2
Answers
cacl2 is the most ionic.
Ionic bonding is the perfect transfer of valence electrons between atoms. This is a type of chemical bond that creates two oppositely charged ions of her. In ionic bonding, metals lose electrons and become positively charged cations, while nonmetals gain their electrons and become negatively charged anions.
An ionic bond also called an electrical bond, is a type of bond created by electrostatic attraction between oppositely charged ions in a compound. Such bonds are formed when the valence (outermost) electron of one atom permanently moves to another atom.
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Which of the following happens to the particles when the temperature of liquid water drops?
kinetic energy decreases
kinetic energy increases and then decreases
kinetic energy increases
kinetic energy stays constant
Answers
Answer:
The Kinetic energy decreases
Explanation:
because the speed of the molecules slows down.
A Virginia class nuclear submarine has an internal volume of 7.9 million
liters at a pressure of 1.0 atm. If a crewman were to open one of the
hatches to the outside ocean while it was underwater (pressure = 25 atm),
what be would the new volume of the air inside the submarine?
Answers
Answer:
1500
Explanation:
I believe this is correct but am not sure, I shall update when I submit my quiz...
in order to construct a beer's law plot in this experiment, a stock solution of dye must be diluted to multiple different concentrations. calculate the concentration, in m, of dye when 6.6 ml of 0.441 m allura red dye is diluted with 21.96 ml of distilled water. assume simple dilution only.
Answers
The concentration of the diluted dye solution is 0.097 M.
To calculate the concentration of the diluted solution, we can use the formula C1V1 = C2V2, where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.
Using the formula, we have:\
C1V1 = C2V2
(0.441 M) (6.6 mL) = C2 (6.6 mL + 21.96 mL)
C2 = (0.441 M) (6.6 mL) / (6.6 mL + 21.96 mL)
C2 = 0.097 M
Therefore, the concentration of the diluted dye solution is 0.097 M.
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At sea level, a kilogram welghs approximately
2 pounds
10 pounds
5 pounds
1 pound
Answers
Answer:
1 kilogram weight at sea level would be the equivalent of 2 pounds.
Explanation:
which of the following atoms has a partially or completely filled (4f) subshell in its ground state configuration? a. pt b. xe c. ba d. tc e. cs
Answers
The atom with a partially or completely filled (4f) subshell in its ground state configuration is option a. Pt (platinum).
The (4f) subshell corresponds to the 4th energy level and the f orbital within that level. To determine which atom has a partially or completely filled (4f) subshell, we need to examine the electron configuration of each atom.
Option a. Pt (platinum) has the electron configuration [Xe] 4f^(14) 5d^(9) 6s^(1). The (4f) subshell is partially filled with 14 electrons.
Option b. Xe (xenon) has the electron configuration [Kr] 5s^(2) 4d^(10) 5p^(6). It does not have electrons in the (4f) subshell.
Option c. Ba (barium) has the electron configuration [Xe] 6s^(2). It does not have electrons in the (4f) subshell.
Option d. Tc (technetium) has the electron configuration [Kr] 5s^(2) 4d^(5). It does not have electrons in the (4f) subshell.
Option e. Cs (cesium) has the electron configuration [Xe] 6s^(1). It does not have electrons in the (4f) subshell.
Therefore, the atom with a partially or completely filled (4f) subshell in its ground state configuration is option a. Pt (platinum).
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What is the volume if 1.5 mol of gas has a pressure of 700 torr at 15°C?
Answers
Answer:
V = 38.48 L
Explanation:
Given that,
No. of moles = 1.5 mol
Pressure, P = 700 torr
Temperature, T = 15°C = 288 K
We need to find the volume of the gas. The ideal gas equation is given by :
\(PV=nRT\\\\V=\dfrac{nRT}{P}\\\\V=\dfrac{1.5\times 62.36\times 288}{700}\\\\V=38.48\ L\), R = L.Torr.K⁻¹.mol⁻¹
So, the required volume is equal to 38.48 L.
The bohr radius theoretically is the __________ distance an electron can approach the nucleus in the hydrogen atom.
Answers
The bohr radius theoretically is the equal distance an electron can approach the nucleus in the hydrogen atom.
Bohr radius named after by Niels Bohr because Niels Bohr proposed the bohr model of an atom. Bohr radius is the mean radius of the orbit of an electron around the nucleus of a hydrogen atom at its ground state and is approximately equal to 5.29177×10⁻11 . the Bohr radius approximately equal to the most probable distance between the nucleus and the electron in a hydrogen atom in its ground state. so theoretically distance an electron is equal approach the nucleus in the hydrogen atom.
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why is the average number of fish species not a whole number?
Answers
Answer:
Because in order to find the average, you need to divide by the number of sites tested. Sometimes that doesn't divide evenly.
Explanation:
A study was conducted of 90 adult male patients following a new treatment for congestive heart failure. One of the variables measured on the patients was the increase in exercise capacity (in minutes) over a 4-week treatment period. The previous treatment regime had produced an average increase of μ=2 minutes. The researchers wanted to evaluate whether the new treatment had increased the value of μ in comparison to the previous treatment. The data yielded y(bar)=2.17 and s=1.05.
(a) if the actual value of mu is 2.1 and alpha is reduced from 0.05 to 0.01, what would be the effect on the power curve?
(b) If the sample size is reduced from 90 to 50, what would be the effect on the power curve?
Answers
a. Decreasing alpha from 0.05 to 0.01 makes the significance level more stringent. You will be less likely to reject the null hypothesis, even when it's false. This increases the probability of a Type II error, thus potentially reducing the power of the test. The power curve will shift to the left.
b. If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.
What more should you know about decreasing the alpha and the power curve?The power curve is a graph that shows the probability of rejecting the null hypothesis as a function of the true value of the mean.
In the given scenarios of this study, Reducing the significance level and reducing the sample size will shift the power curve to the left, indicating a decrease in the statistical power of the test.
The power of a statistical test is the probability that it correctly rejects the null hypothesis when the alternative hypothesis is true.
a) Reducing alpha from 0.05 to 0.01 means that we are more stringent in our assessment of whether the new treatment is effective.
This will result in a decrease in the power of the test, meaning that it is less likely that we will be able to detect a difference between the new treatment and the previous treatment.
b) If the sample size is reduced from 90 to 50, the effect on the power curve is that it will also shift towards the left.
This is because a smaller sample size decreases the power of the test. A larger sample size provides more information and thus makes it more likely to correctly reject the null hypothesis when the alternative hypothesis is true.
Therefore, by reducing the sample size, you are decreasing the likelihood of detecting a true effect if one exists, thus reducing the power of the test.
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how many moles are present in each of the following at stp? (a) 54.5 dm3 ch4 (b) 250.0 cm3 co (c) 1.0 m3 o2
Answers
(a) 54.5 dm³ CH₄ contains approximately 2.28 moles.
(b) 250.0 cm³ CO contains approximately 0.0121 moles.
(c) 1.0 m³ O₂ contains approximately 43.56 moles.
To determine the number of moles present in each of the given substances at STP (Standard Temperature and Pressure), we need to use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.
At STP, the conditions are defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (atm). The gas constant (R) is equal to 0.0821 L·atm/(mol·K).
(a) 54.5 dm³ CH₄:
To convert dm³ to liters, we multiply by 1 (since 1 dm³ = 1 liter). Therefore, the volume is 54.5 liters.
Using the ideal gas law, we have:
PV = nRT
(1 atm) (54.5 L) = n (0.0821 L·atm/(mol·K)) (273.15 K)
n = (1 atm * 54.5 L) / (0.0821 L·atm/(mol·K) * 273.15 K)
n ≈ 2.28 moles
(b) 250.0 cm³ CO:
To convert cm³ to liters, we divide by 1000. Therefore, the volume is 0.250 liters.
Using the ideal gas law:
PV = nRT
(1 atm) (0.250 L) = n (0.0821 L·atm/(mol·K)) (273.15 K)
n = (1 atm * 0.250 L) / (0.0821 L·atm/(mol·K) * 273.15 K)
n ≈ 0.0121 moles
(c) 1.0 m³ O₂:
To convert m³ to liters, we multiply by 1000. Therefore, the volume is 1000 liters.
Using the ideal gas law:
PV = nRT
(1 atm) (1000 L) = n (0.0821 L·atm/(mol·K)) (273.15 K)
n = (1 atm * 1000 L) / (0.0821 L·atm/(mol·K) * 273.15 K)
n ≈ 43.56 moles
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84 pt =_____ qt
5.0 gal =_____ L
Answers
Answer:
84 pt =__50.4399___ qt
5.0 gal =___18.9271__ L
Explanation:
Have A Wonderful Day!!
Answer: 84 pints = 42 quarts
5.9 gallons = 1.89271
Explanation: