Final answer:
Dark matter and dark energy are termed 'dark' because they do not emit, absorb, or reflect light, which makes them invisible to traditional detection methods such as telescopes; they are detectable only through their gravitational effects.
Explanation:
Dark matter and dark energy are described as "dark" not because they emit blackbody radiation, absorb light, or are merely found in shadows, but because they are difficult to detect by conventional means. The correct answer is D. Because we cannot easily detect them. Dark matter does not emit, absorb, or reflect any light, making it invisible to traditional telescopes that detect electromagnetic radiation. Astronomers infer its existence through the gravitational effects it has on visible objects, such as the rotation curves of galaxies and the gravitational lensing of light from distant objects.
The term "dark" in dark matter and dark energy refers to the fact that these components do not interact with electromagnetic radiation in a way that allows us to detect them directly. Dark matter makes up approximately 80% of the matter in the Universe, and its presence is known primarily through its gravitational influence. Similarly, dark energy is hypothesized to be responsible for the observed acceleration of the expansion of the Universe. However, its nature remains a profound mystery in physics.
If a base is added to water, what will occur?
hydronium ion concentration is increased.
hydroxide ion concentration is decreased.
[H+] is decreased.
[OH-] is decreased.
Answer:
C
Explanation:
The first and most obvious statement is that [OH-] is increased, but that is not offered to you.
The second most obvious statement is that the [H+] ion is decreased. That is offered to you. It is C
Answer:
[H+] is decreased.
Explanation:
Arrhenius Theory:
An acid is a substance which produces one or more hydrogen ions, (H+) in aqueous solution.
Examples:
[tex]HCl(aq)>H^+(aq)+Cl^-(aq)\\\\HBr(aq)>H^+(aq)+Br^- (aq)\\\\H_2 SO_4(aq)>2H^+(aq)+SO_4^2- (aq)\\\\H_3 PO_4(aq) >3H^+ (aq)+PO_4^3-(aq)\\\\CH_3 COOH(aq)>CH_3 COO^- (aq)+H^+ (aq)[/tex]
A Base is a substance which produces one or more hydroxyl ion or hydroxide ion (OH-) in aqueous solution.
Examples
[tex]NaOH(s)>Na^+ (aq) + OH^- (aq)\\\\KOH(s)>K^+ (aq) +OH^- (aq)\\\\Ca(OH)_2 (s)>Ca^{2+} (aq)+2OH^-(aq)\\\\Al(OH)_3 (s)> Al^{3+}(aq)+ 3OH^- (aq)[/tex]
Please note:
(aq) stands for aqueous which means in the presence of water that is, water acts as a solvent
So, on adding a base to the water increase in [tex][OH^-][/tex] will take place and this will decrease the Hydrogen ion concentration
Pure water contains [tex][H^+]=[OH^-][/tex]
if the solution is acidic [tex][H^+ ]>[OH^- ][/tex]
if the solution is Basic [tex][H^+ ]<[OH^- ][/tex]
Which factor is most important to consider when evaluating a journal article about global warming?
A) Is the article long enough?
B) Does the article contain facts or only opinions?
C) Did the author of the article use complex, scientific words?
D) Does the author of the article have a doctorate degree?
Answer:
Does the article contain facts or only opinions? - B)
Answer:
The correct answer will be option-B.
Explanation:
Global warming is a hot topic of debate in the science world on how to resolve the environmental issues created by global warming. The scientific journals usually contain the articles related to the new research and scientific discoveries reviewed by the peer-review fellow scientists.
The journals ensure that the research articles to be published containing the experimental data which supports the hypothesis which should not be plagiarized. The article should be based on the reviewed facts and not personal small opinions. So to evaluate articles on global warming, one must ensure that the data should not be plagiarized.
Thus, Option-B is the correct answer.
How are weathering and erosion the same?
Answer:
Erosion involves movement to a new location, Weathering occurs in place, although they can occur together and both are caused by similar factors of wind, water, ice, temperature, and even biological action.
Which substance is a gas at 20˚C and one atmosphere of pressure? A. C B. O3 C. Ca D. I2
Answer:
O3
Explanation:
The answer to the question is O3 .
Hope this helped! Have an amazing day :)
The gas substance at 20˚C and one atmosphere of pressure is carbon dioxide.
Explanation:Out of the options given, the substance that is a gas at 20˚C and one atmosphere of pressure is A. C. C stands for carbon, which exists in its gaseous form as carbon dioxide (CO2) at this temperature and pressure. Carbon dioxide is a compound composed of one carbon atom bonded to two oxygen atoms.
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Two scientists did the same experiment but arrived at different results. The results would most likely be ?
Answer:
They did not have accurate data and information.
Answer:
Provide new testable ideas.Explanation:
Supposing that both scientific had objectivity and no bias in their research, the results most likely provide new testable ideas. This type of situation occurs when new theories are being proved for first time. Most of people thing that scientific laws were proved in one experiment, but the reality is that experiments need plenty reproductions, even after hundreds of years of research.
How would the number of moles (n) of O2 change if the atmospheric pressure doubled but all variables stayed the same?
Answer:
The no. of moles will be doubled as the pressure is doubled.
Explanation:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If V and T are constant, and have different values of P and n:(P₁n₂) = (P₂n₁).
P₂ = 2P₁,
∴ n₂ = (P₂n₁)/(P₁) = (2P₁n₁)/(P₁) = 2n₁.
So, the no. of moles will be doubled as the pressure is doubled.
The number of moles (n) of O2 would remain unchanged if the atmospheric pressure doubled but all other variables, such as temperature, volume, and the amount of gas, stayed the same.
According to the Ideal Gas Law, the relationship between pressure (P), volume (V), number of moles (n), and temperature (T) is given by:
[tex]\[ PV = nRT \][/tex]
where R is the ideal gas constant.
If the atmospheric pressure doubles, we can denote the new pressure as [tex]\( 2P \)[/tex]. Assuming that the volume (V), temperature (T), and the amount of gas (n) remain constant, the Ideal Gas Law for the new conditions would be:
[tex]\[ (2P)V = nRT \][/tex]
Since the volume (V), temperature (T), and the gas constant (R) are unchanged, the equation simplifies to:
[tex]\[ 2PV = nRT \][/tex]
Comparing this to the original Ideal Gas Law [tex]\( PV = nRT \),[/tex] we can see that the number of moles (n) does not change. The pressure and volume are directly proportional to each other according to Boyle's Law, which is a special case of the Ideal Gas Law when temperature and number of moles are constant. Therefore, if the volume were to decrease by half to maintain the relationship [tex]\( PV = nRT \)[/tex], the number of moles would remain the same. However, if the volume is not changed and only the pressure is doubled, the equation does not hold true unless the number of moles is also doubled. But in the context of the atmosphere, the volume would naturally decrease as the pressure increases (assuming a closed system), and thus the number of moles of O2 would not change.
Which statement best describes the role of plants in the water and carbon cycles?
Plants release oxygen when they decompose take in oxygen for photosynthesis.
Plants take in carbon dioxide during photosynthesis and absorb water through their leaves and roots.
Plants take in oxygen during photosynthesis and absorb carbon dioxide through their leaves and roots.
Plants use oxygen to perform photosynthesis and release carbon dioxide as a by-product.
Answer: Option B
Explanation:
The plants uses sunlight to convert carbon dioxide and water into more complex carbohydrate known as glucose.
Plants utilize carbon dioxide during photosynthesis. Plants absorb water through roots and leaves.
Plants release oxygen as a by-product which is used by animals and other organism.
The carbohydrates inside the plants is broken down into simpler form and the energy released is used by plants for its cellular processes. This is known as cellular respiration.
Answer:
Plants take in carbon dioxide during photosynthesis and absorb water through their leaves and roots.
which is the odd one brass,copper, aluminum,iton , sapphire
Sapphire.
It is a stone not a metal.
Mushrooms play look like plants but you’re actually fungi what is the similarities and differences between fungi and plants
Answer:
Explanation:
Similarities
Both fungi and plants are multicellular organisms with different cells performing various life functions. They are both eukaryotic organisms with membrane bound organelles and having a distint nucleus. Fungi and plants are generally fixed and they do not move from one place to another like animals.Differences
Plants produce their own food and are called autotrophs while most fungi are heterotrophs that feeds on chemical matter from producers. Plants are producers in the ecosystem while fungi are decomposers. Plants reproduce using seeds while fungi use sporesIn plants, food produced are stored as starch whereas in fungi, food is stored as glycogen. Examples of plants are orange, mango, banana while mushrooms are fungi. Most plants are generally green in color while fungi are of different colors and are commonly white.What is the percent composition of NaHCO3?
23.20% Na, 4.26% H, 18.41% C, and 54.13% O
24.21% Na, 4.35% H, 12.26% C, and 59.18% O
27.36% Na, 1.20% H, 14.30% C, and 57.14% O
30.44% Na, 2.12% H, 10.25% C, and 60.19% O
Answer:
Option-C (27.36% Na, 1.20% H, 14.30% C, and 57.14% O)
Explanation:
Percent Composition is defined as the %age by mass of each element present in a compound. Therefore, it is a relative amount of each element present in a compound.
Calculating Percent Composition of NaHCO₃:
1: Calculating Molar Masses of all elements present in NaHCO₃:
a) Na = 22.99 g/mol
b) H = 1.01 g/mol
c) C = 12.01 g/mol
d) O₃ = 16.0 × 3 = 48 g/mol
2: Calculating Molecular Mass of NaHCO₃:
Na = 22.99 g/mol
H = 1.01 g/mol
C = 12.01 g/mol
O₃ = 48 g/mol
----------------------------------
Total 84.01 g/mol
3: Divide each element's molar mass by molar mass of NaHCO₃ and multiply it by 100:
For Na:
= 22.99 g.mol⁻¹ ÷ 84.01 g.mol⁻¹ × 100
= 27.36 %
For H:
= 1.01 g.mol⁻¹ ÷ 84.01 g.mol⁻¹ × 100
= 1.20 %
For C:
= 12.01 g.mol⁻¹ ÷ 84.01 g.mol⁻¹ × 100
= 14.29 % ≈ 14.30 %
For O:
= 48.0 g.mol⁻¹ ÷ 84.01 g.mol⁻¹ × 100
= 57.13 % ≈ 57.14 %
Answer:
Great Explanation and Answer Above, Just confirming its the correct answer.
Hope This Helps!
C: 27.36% Na, 1.20% H, 14.30% C, and 57.14% O
Explanation:
An acid without
oxygen EXCEPT HCI
HF hydrofluoric acid
HBr hydrobromic acid
HI hydroiodic acid
H₂S hydrogen sulfide
2. How many nanometers are in 5.6 x 10-4 meters?
Answer:
[tex]\boxed{5.6 \times 10^{5}\text{ nm}}[/tex]
Explanation:
1 nm = 10⁻⁹ m
[tex]5.6 \times 10^{-4}\text{ m} \times \dfrac{\text{1 nm}}{10^{-9}\text{ m}} = \mathbf{5.6 \times 10^{5}}\textbf{ nm}\\\\\text{There are } \boxed{\mathbf{5.6 \times 10^{5}}\textbf{ nm}} \text{ in 5.6 $\times 10^{-4}$ m}[/tex]
5.4 × [tex]10^{5}[/tex] nanometers are in 5.6 x [tex]10^{-4}[/tex] meters
Calculation,
Since, 1 nanometer = [tex]10^{-9}[/tex] meter.
1 meter = [tex]10^{9}[/tex] nanometer
5.6 x [tex]10^{-4}[/tex] meters = 5.6 x [tex]10^{-4}[/tex] × [tex]10^{9}[/tex] nanometer = 5.4 × [tex]10^{5}[/tex] nanometer
What is unit of length or distance?The distance or length can be measured by many units like,
Picometer, Nanometer, micrometer, milimeter, centimeter, meter and kilometer.The largest unit is kilometer.The standard unit of length is meter.learn about nanometer,
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In 1995, 78 women were enrolled in chemistry at a certain high school while 162 men were enrolled. What was the percentage of women taking chemistry? The percentage of men?
Answer:
32.5% female
67.5% male
Explanation:
To find a percentage, you need your total.
To find your total, add the amount of men and the amount of women.
[tex]162+78=240[/tex]
240 total people were enrolled in chemistry at that high school.
Next, to solve for your percentage of female participants, divide the amount of women by your total.
[tex]\frac{78}{240} =32.5[/tex]
32.5% were women. Do the same with your male participants for your male percentage.
[tex]\frac{162}{240} =67.5[/tex]
67.5% were men.
The percentage of women taking chemistry is 32.5%, while the percentage of men taking chemistry is 67.5%.
What is Chemistry?Chemistry may be defined as a branch of science that significantly deals with the composition, properties, and structure of chemical elements and compounds. It also involves a brief study of how they can alter and the energy that is liberated or absorbed when they change.
According to the question, the number of women enrolled in chemistry = 78.
The number of men enrolled in chemistry = 162.
∴ The total number of individual = 78 + 162 = 240.
Now, the percentage of women taking chemistry is calculated by the following formula:
[tex]\frac{number of women enrolled in chemistry}{ the total number of individual}[/tex]
= 78/240 = 32.5%.
Similarly, the percentage of men taking chemistry is calculated by the following formula:
[tex]\frac{number of men enrolled in chemistry}{the total number of individuals}[/tex]
= 162/240 = 67.5%.
Therefore, it is clear that 32.5% of women were enrolled in chemistry, while 67.5% of men were enrolled themselves in chemistry.
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when an iron nail is placed in an aqueous solution of copper(ii)sulphate,a reaction take place.construct an ionic equation for reaction?
The net ionic equation for this reaction is [tex]Fe(s) \ + \ Cu^{2+}(aq) \ \rightarrow \ Fe^{2+}(aq) \ + \ Cu(s)[/tex]. In ionic equations the soluble compounds are written in their dissociated ion forms. The ionic equation can be determined by knowing the general solubility rules. In this problem there are sulfate compounds involved. It is important to know that sulfates are generally soluble except for sulfates of Ba, Pb, Ag, and Sr. Therefore, the ones dealt with in this problem, CuSO4 and FeSO4, are both soluble in water.
Further Explanation:
The complete equation for this reaction is:
[tex]Fe(s) \ + \ CuSO_{4}(aq) \rightarrow \ FeSO_{4}(aq) \ + \ Cu(s)[/tex]
CuSO4 and FeSO4 are soluble in water which will lead to the ionic equation:
[tex]Fe(s) \ + \ Cu^{2+}(aq) \ + \ SO_{4}^ {2-}(aq) \ \rightarrow \ Fe^{2+}(aq) \ + \ SO_{4}^{2-}(aq) \ + \ Cu(s)[/tex]
Since the sulfate ion appears on both sides, it is a spectator ion. Spectator ions are unchanged in the chemical reaction and are removed from the net ionic equation:
[tex]\boxed {Fe(s) \ + \ Cu^{2+}(aq) \ \rightarrow \ Fe^{2+}(aq) \ + \ Cu(s)}[/tex]
Based on the net ionic equation it can be seen that this is a reduction-oxidation reaction. Iron was oxidized and copper was reduced.
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Which equation using element symbols correctly describes the reaction: "One molecule of methane plus two molecules of diatomic oxygen react to form two molecules of water and one molecule of carbon dioxide?"
A. CH4+2O2+2H2O→CO2
B. 2H2O+CO2→CH4+2O2
C. CH4+2O2→2H2O+CO2
D. CO2+2O2→2H2O+CO2
Answer:
C. CH₄+2O₂ →2H₂O+CO₂
Explanation:
This is a popular combustion reaction.
C. CH₄+2O₂ →2H₂O+CO₂
In combustion, hydrocarbons burn in the presence of oxygen gas and they produce water and carbon dioxide only. The process is accompanied with the release of energy.
We simply say for the above reaction that:
One molecule of methane(CH₄) reacts with two molecules of oxygen gas(O₂) to produce two molecules of water(H₂O) and one molecule of carbon dioxide only
Answer:
the answer is C
Explanation:
because I just took the a quiz with this same question and it was right.
Write the complete, balanced equation for the reaction between iron (III) oxide and carbon monoxide.
Answer:
Fe(iii)2O3 + 3CO ===> 2Fe + 3CO2
Explanation:
Fe(iii)2O3 + CO ===> Fe + CO2
The best thing to do is start with the Oxygens. They are the most complicated.
Fe(iii)2O3 + 3 CO ===> Fe + 3 CO2
Unfortunately this equation is a bit of by guess and by gosh. You need to balance the oxygens so that the total is an even number. That's because the right hand side is always going to be even. [The 2 on CO2 will make anything in front of it even).
So there are 6 oxygens on the left and 6 on the right. The carbons by accident are balanced with this maneuver. So all that is left is the irons.
Fe(iii)2O3 + 3CO ===> 2Fe + 3CO2
This equation is a bit nasty, but in higher chemistry courses, you will learn how to make it a whole lot simpler. For now you are just going to have to put up with the nastiness of the question and guess.
Examine the chemical formula.
CS2
Which answer choice lists this compound's chemical name?
carbon disulfate
carbon bisulfate
carbon disulfide
carbon bisulfide
Answer:
Carbon disulfide
Explanation:
Carbon disulfide is the chemical name of the compound, CS2.
Carbon disulfide is a clear or colorless liquid that is often used in organic chemistry.
50 ml decimolar H2SO4 when mixed with 50 ml decimolar NaOH then normality of resultant solution is ?
Answer:
0.05 NExplanation:
You can calculate the normality of an acid by multiplying the molarity by the number of acid hydrogens. So, the normality for H₂SO₄ is its molarity multiplied by 2.
For bases, the normality is the product of the molarity and the number of OH⁻ ions. So, for NaOH the normality is its same molarity.
Also remember the definitions and formulae:
Molarity = number of moles of solute / volume in liters of the solutionNormality = number of equivalents of solute / volume in liters of solutionNormality = molarity × number of hydrogens or OH⁻.The chemical equation for the reaction of H₂SO₄ with NaOH is:
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2 H₂OAs you see, the mole ratio is 1 mol H₂SO₄ : 2 mol NaOH meaning that every mol of H₂SO₄ neutralizes 2 moles of NaOH.
Since both reactants have the same molarity (decimolar = 0.1M) and the same volume, there are the same number of moles of each, but they have different normalities, which means different number of equivalents.
At the same molarity, the number of equivalents of H₂SO₄ is double than the number of equivalents of NaOH.
Then, after reaction half the number of equivalents of H₂SO₄ will remain in solution. The calculations are:
Before reacting:Number of moles of each compound before reacting:
H₂SO₄: 0.050 liter × 0.1 M = 0.005 mol
NaOH: 0.050 liter × 0.1 M = 0.005 mol
After reacting:Since ther reaction is 1 mol acid : 2 moles base, the base is the limiting reactant (it will be fully consumed).
Only 0.005 / 2 mol of acid will react and 0.005 / 2 mol will remain in solution. That is 0.0025 mol.
The volume of the solution will be 50 ml + 50 ml = 100 ml = 0.10 liter
So, after reaction you have:
Molarity of acid = 0.0025 mol / 0.10 liter = 0.025 M.
Normality of acid = 0.025 × 2 = 0.05 N ← answerWhich physical method can be used for obtaining a sample of salt from a small beaker of salt water?
boiling
freezing
chromatography
sorting
Answer:
Boiling.
Explanation:
Solution is a uniform composition and can be separated by physical methods.Boiling is the process of fast evaporation of water, that a liquid is boiled to its boiling point.Boiling point is the temperature at which the condensation pressure of the liquid is equal to the force used on the liquid by the nearby environment.Boil the water till complete water evaporation, water evaporates and salt remain in the beaker.So, the right choice is: Boiling.
Answer:
A. Boiling
Explanation:
Just tested
Why do electrons affect the structure of a molecule?
Electrons affect the structure of a molecule by playing a role in chemical bonding. They are involved in the formation of chemical bonds between atoms, which determines the shape and stability of the molecule.
Explanation:The structure of a molecule is affected by electrons because electrons play a significant role in chemical bonding. Electrons are negatively charged particles that orbit the nucleus of an atom. When atoms come together to form a molecule, the electrons are involved in the formation of chemical bonds between the atoms.
For example, in covalent bonding, atoms share electrons, which can result in the formation of single, double, or triple bonds. The arrangement and distribution of electrons determine the shape and stability of the molecule.
Are elements with similar chemical properties found in the same period or group on the periodic table?
A.
period
B.
group
The elements with similar chemical properties are found in the same group of the periodic table. Thus, the correct option is B.
What are chemical properties?Chemical properties may be defined as those properties of matter or substances that can be observed in a chemical reaction. Some of them are flammability, toxicity, the heat of combustion, pH value, rate of radioactive decay, chemical stability, etc.
The groups are arranged vertically in a periodic table that shares identical chemical properties of the elements. There are 18 groups present in the modern periodic table.
Each group of the periodic table illustrates its own unique properties in terms of valance shell, electron, identity, and reactivity. For example, group 17 is known as halogen.
Therefore, the elements with similar chemical properties are found in the same group of the periodic table. Thus, the correct option is B.
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Try try try please for me please
Answer:
a.) It is a chemical reaction because a new substance was formed and a colour change occurred in the reaction.
b.) Iron- Metallic element
sulpher- Non-Metalic element
Iron Sulphide- Compound
HOPE IT HELPS....
Consider the following equation.
Fe2O3(s) + 3H2(g) → 2Fe(s) + 3H2O(g)
H = 98.8 kJ, and S = 141.5 J/K. Is this reaction spontaneous or nonspontaneous at high and low temperatures?
A. spontaneous at high temperatures, non-spontaneous at low temperatures
B. Non-spontaneous at high and low temperatures
C. Spontaneous at low temperatures, non-spontaneous at high temperatures
D. Spontaneous at high and low temperatures
Answer:
This reaction is A. Spontaneous at high temperatures, and non-spontaneous at low temperatures.
Explanation:
Both the enthalpy change [tex]\Delta H[/tex] and the entropy change [tex]\Delta S[/tex] due to this reaction are positive. A chemical reaction will be spontaneous only if the change in its Gibbs Free Energy [tex]\Delta G = \Delta H - T \cdot \Delta S[/tex] is negative. [tex]T[/tex] is the absolute temperature in degrees Kelvins.
Assume that both [tex]\Delta H[/tex] and [tex]\Delta S[/tex] doesn't change much as [tex]T[/tex] increases. The value of [tex]\Delta G[/tex] will initially be close to [tex]\Delta H[/tex] when [tex]T[/tex] is small. The sign of [tex]\Delta G[/tex] will depends on that of [tex]\Delta H[/tex]. However, [tex]\Delta H[/tex] is positive, so at low temperatures [tex]\Delta G[/tex] will be positive and the reaction will be non-spontaneous.
However, as [tex]T[/tex] increases, the role of entropy change becomes more significant. The sign of [tex]\Delta G[/tex] will eventually be the opposite of [tex]\Delta S[/tex]. The value of [tex]\Delta G[/tex] will eventually drop below zero after the value of [tex]T[/tex] rises above [tex]\Delta H / \Delta S[/tex]. The reaction will eventually become spontaneous.
Answer:
A.) spontaneous at high temperatures, non-spontaneous at low temperatures
Explanation:
Edge2021
How many molecules of Ca are found in a sample with 0.2 mols?
Answer:
[tex]\boxed{1.2 \times 10^{23}\text{ atoms}}[/tex]
Explanation:
6.023 × 10²³ atoms of Ca are in 1 mol of Ca
[tex]\text{No. of atoms} = \text{0.2 mol} \times \dfrac{6.023 \times 10^{23}\text{atoms }}{\text{1 mol }} = \mathbf{1.2 \times 10^{23}} \textbf{ atoms}}\\\\\text{There are }\boxed{\mathbf{1.2 \times 10^{23}} \textbf{ atoms}} \text{ atoms in 0.20 mol of Ca}[/tex]
Heat flows from water in one container to another. What difference between the two samples of water causes heat to flow?
Answer:
Difference in temperature
Explanation:
Temperature is the degree of hotness or coldness of a body. The difference in temperature between two bodies enables heat transfer from the hotter body to the colder one. If two bodies are at the same temperature, heat transfer will not occur between them. This why in the vicinity of hot water, a cold water becomes warmer.
Which of the following elements is not contained in a carbohydrate?
Carbon
Hydrogen
Nitrogen
Oxygen
Option A. Nitrogen is not in a carbohydrate
carbo-(carbon)
Hydrate-water
Which of the following elements is not contained in a carbohydrate?Nitrogen is not contained carbohydrate, Nitrogen is in the soil under our feet, in the water we drink, and in the air we breathe. In fact, nitrogen is the most abundant element in Earth's atmosphere: approximately 78% of the atmosphere is nitrogen! Nitrogen is important to all living things, including us.
In addition to what we might think of as the classical elements: earth, water, fire, air, and gas (space), in many ancient eastern concepts of self there are an additional two: consciousness (or thought itself) and the element of spirit. Each of us is comprised of all seven elements
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Which of the following lists igneous rock in order from least to most ferromagnesian silicates?
Intermediate, ultramafic, mafic, felsic
Ultramafic, mafic, intermediate, felsic
Felsic, intermediate, mafic, ultramafic
Felsic, mafic, ultramafic, intermediate
Answer:
Felsic, intermediate, mafic, ultramafic
Explanation:
Ferromagnesian igneous rocks are those that contains ferromagnesian silicate minerals with magnesium and iron in their structure. Some of these minerals are olivine, pyroxene, amphibole, calcic palgioclase e.tc. Ultramafic rocks have these silicate minerals in them. They impart a dark coloration on their outlook.
Felsic minerals on the other extreme are rich in non-ferromagesian minerals such as quartz, feldspars which lacks magnesium and iron in their structures. The intermediate and the mafic igneous rocks are a mix between the two extremes. So in terms of ferromagnesian silicates component:
felsic < intermediate < mafic < ultramafic
The correct order of igneous rocks from least to most ferromagnesian silicates is: Felsic, Intermediate, Mafic, Ultramafic. The sequence represents a gradation from rocks with the lowest content of ferromagnesian minerals to the ones with the highest content.
Explanation:The correct order of igneous rocks from least to most ferromagnesian silicates is: Felsic, Intermediate, Mafic, Ultramafic. This order represents a sequence from rocks with the lowest amount of ferromagnesian silicates to the highest amount. Felsic rocks are typically light in color and contain less than 20% ferromagnesian minerals, which are rich in iron and magnesium. Intermediate rocks contain 20-45% ferromagnesian minerals. Mafic rocks are darker and contain 45-85% of these minerals. Lastly, ultramafic rocks have more than 85% ferromagnesian minerals, being the rock type with the highest content.
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How many mols are present in the a sample of silver nitrate which has
5.3x10^24 molecules.
Answer: 5.3 x 10^24 formula units of silver nitrate is equivalent to 8.8 moles of silver nitrate. Silver nitrate is an ionic compound, therefore, its representative particle is called a "formula unit" instead of molecule. For every mole of a substance, we know that there are 6.022 x 10^23 representative units of that substance. The amount of particles in one mole of substance is called Avogadro's number.
Further Explanation:
We can convert from number of representative particles to moles using the formula:
[tex]\boxed {no. \ of \ moles \ = \ ( given \ no. \ of \ particles) \ (\frac{1 \ mole}{\ 6.022 \ x 10^{23} particles})}[/tex]
For this problem, we can calculate the number of moles by plugging in the given values to the equation above,
[tex]no. \ of \ moles \ = (5.3 \ x \ 10^{24} \ formula \ units \ AgNO_{3}) \ (\frac{1 \ mole \ AgNO_{3}}{6.022 \ x 10^{23} \ formula \ units AgNO_{3}}) \\\\\boxed {no. \ of moles \ AgNO_{3} \ = \ 8.8 \ moles}[/tex]
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Final answer:
To find the number of moles of silver nitrate in a sample with 5.3x10^24 molecules, divide the number of molecules by Avogadro's number. This results in approximately 8.8 moles of silver nitrate.
Explanation:
To determine how many moles are present in a sample of silver nitrate with 5.3x1024 molecules, you can use Avogadro's number, which is 6.022 x 1023 molecules per mol. By dividing the number of molecules in the sample by Avogadro's number, you will get the number of moles in the sample.
To perform the calculation:
Number of moles = (5.3x1024 molecules) / (6.022x1023 molecules/mol)Number of moles ≈ 8.8 moles of silver nitrateTherefore, the sample contains approximately 8.8 moles of silver nitrate.
How many molecules of sodium oxide will be created if 275 grams of sodium reacts with excess oxygen?
Given the equation: 4Na + O2 -> 2Na2O
Given 275 grams of sodium, approximately 3.6 x 10^24 molecules of sodium oxide are created when this reacts with excess oxygen, as per the provided balanced chemical equation.
Explanation:To find out how many molecules of sodium oxide will be created, we need to first calculate the number of moles of sodium being reacted. Given that the molar mass of sodium is about 23g/mol, if we have 275 grams of sodium, that would translate to about 275/23 = 11.96 moles of sodium.
Using the molar ratio in the balanced chemical equation, 4 moles of sodium produce 2 moles of sodium oxide. So, 11.96 moles of sodium would produce 11.96/4 * 2 = 5.98 moles of sodium oxide.
Avogadro's number tells us that one mole of any substance contains 6.022 x 1023 molecules. Therefore, 5.98 moles of sodium oxide would contain 5.98 * 6.022 x 1023 = 3.6 x 1024 molecules of sodium oxide.
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When 275 grams of sodium reacts with excess oxygen, approximately 3.6 x 10^24 molecules of sodium oxide will be created.
Explanation:To determine the number of molecules of sodium oxide produced, we need to use the given equation balanced equation 4Na + O2 -> 2Na2O. The molar mass of sodium (Na) is 22.99 g/mol and the molar mass of sodium oxide (Na2O) is 61.98 g/mol. We can use these molar masses and the given mass of sodium to calculate the number of moles of sodium, and then use the stoichiometric coefficients in the balanced equation to find the number of moles of sodium oxide produced. Finally, we can convert the number of moles to molecules using Avogadro's number (6.022 x 10^23).
First, we calculate the number of moles of sodium using the formula:
Moles = Mass / Molar mass
Moles of sodium = 275 g / 22.99 g/mol = 11.97 mol (approximately)
According to the balanced equation, 4 moles of sodium react to form 2 moles of sodium oxide. So, using the molar ratio, we can determine the number of moles of sodium oxide produced:
Moles of sodium oxide = 2/4 * 11.97 mol = 5.98 mol (approximately)
Finally, we can convert the number of moles of sodium oxide to molecules using Avogadro's number:
Number of molecules of sodium oxide = Moles of sodium oxide * Avogadro's number
Number of molecules of sodium oxide = 5.98 mol * 6.022 x 10^23 molecules/mol = 3.6 x 10^24 molecules
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An oxygen atom has a mass of 2.66*10^-23 and a glass of water has a mass of 0.050 kg. What is the mass of 1 mole of oxygen atoms? Round your answer to 3 significant digits. How many moles of oxygen atoms have a mass equal to the mass of a glass of water? Round your answer to 2 significant digits.
Answer:
16.0 g; 3.1 mol
Explanation:
(a) Mass of O atoms
Mass = 6.022 × 10^23 atoms × (2.66 × 10^-23 g/1 atom) = 16.0 g
(b) Moles of O atoms
0.050 kg = 50 g
Moles = 50 g × (1 mol/16.0 g) = 3.1 mol
Answer : The mass of 1 mole of oxygen atoms is, 16.0 grams
The moles of oxygen atoms is, 3.1 moles
Explanation :
First we have to calculate the mass of 1 mole of oxygen atoms.
Given : Mass of 1 oxygen atom = [tex]2.66\times 10^{-23}g[/tex]
As, 1 atom of oxygen has mass = [tex]2.66\times 10^{-23}g[/tex]
So, [tex]6.022\times 10^{23}[/tex] atom of oxygen has mass = [tex](6.022\times 10^{23})\times (2.66\times 10^{-23})=16.0g[/tex]
Thus, the mass of 1 mole of oxygen atoms is, 16.0 g
Now we have to calculate the moles of oxygen atoms.
As per question, the mass of oxygen atoms = mass of a glass of water = 0.050 kg = 50 g
Formula used :
[tex]\text{Moles of oxygen atoms}=\frac{\text{Mass of oxygen atoms}}{\text{Molar mass of oxygen atoms}}[/tex]
Molar mass of oxygen atom = 16 g/mole
[tex]\text{Moles of oxygen atoms}=\frac{50g}{16g/mole}=3.1mole[/tex]
Therefore, the moles of oxygen atoms is, 3.1 moles