Explanation:
Critics of evolution commonly appeal to past scientific hoaxes such as the Piltdown Man forgery. It is argued that because scientists have been mistaken and deceived in the past about evidence for various aspects of evolution, the current evidence for evolution is likely to also be based on fraud and error.
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The base Ba(OH)2 neutralizes the acid H2SO4 according to the equation below. What salt is produced?
H2SO4 + Ba(OH)2 -->
A. BaSO4
B. BaH2
C. BaH2S
D. BaO4
Answer:
According to the equation below salt is produced by BaH2s
Answer:
I think b is the correct answer
it is for science class please help answer the questions and fast . I will
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22. A mixture of gases contains 1.0 atm of neon, 2.0 atm
of Argon, and 6.0 atm of xenon. What is the total pressure
in the container?
The total pressure of the mixture of the nobles gases in the container is determined as 9 atm.
What is total pressure of the gases?
The total pressure of the gasses is equal to the total pressure of the container.
Pt = P1 + P2 + P3
Pt = 1 atm (neon) + 2 atm (Argon) + 6 atm( xenon)
Pt = 9 atm
Thus, the total pressure of the mixture of the nobles gases in the container is determined as 9 atm.
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What is the wavelength of a wave that has a frequency of 6.1 x 10^9 Hz? Remember that c = 2.998 x 10^8 m/s.
A.) 52m
B.) 5.2m
C.) 0.49m
D.) 0.049m
Answer:
speed = wavelength × frequency
wavelength = Speed/frequency
wavelength = 2.998 x 10^8 m/s ÷ 6.1 x 10^9 Hz
wavelength = 0.049m
Based on your research, which source of energy do you think best meets the needs of society? Defend your answer in 50 to 100 words.
Currently, fossil fuels meet the 80% of needs of the society. But it is a non-renewable source, and it will extinct soon. The leading renewable source is wind power.
What is the non-renewable and renewable source?Non-renewable energy are the energies that will require a thousand of years to make and ones extinct, will not be prepared.
Renewable energy sources can be prepared again and again, examples are wind, solar, hydropower.
Thus, the fossil fuel and wind power is the leading source of energy that meets the needs of society.
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A gas occupies a volume of 140. mL at STP. What is the volume of the gas at 25°C and 3.00 atm
At STP
pressure is 1atmSo
Apply Boyles law
P1V1=P2V2140(3)=1V2420=V2V2=420mLwhat type of element is always radioactive?
Arrhenius theorized that an acid is a chemical compound that
Answer:
increases the H + ion concentration in aqueous solution
Explanation:
An Arrhenius base is a compound that increases the OH − ion concentration in aqueous solution. Arrhenius theory, theory, introduced in 1887 by the Swedish scientist Svante Arrhenius, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−). Arrhenius Definition of acids. An acid is a substance that dissociates in water to produce H+ (hydrogen ions) Arrhenius Definition of strong acids. A strong acid is a substance that fully dissociates in water to give hydrogen ions. Arrhenius Definition of weak acids.
why is it necessary to use clean sponge and cleaning rags in dishwashing?
Answer:
cloths/sponges can harbor harmful pathogens and spread germs if not cleaned frequently. A damp, smelly dish cloth/sponge is telling you germs are multiplying!
Explanation:
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Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. which word equation best represents this chemical reaction? isopropanol right arrow. carbon dioxide water heat isopropanol right arrow. carbon dioxide water oxygen isopropanol oxygen right arrow. carbon dioxide water heat isopropanol oxygen heat right arrow. carbon dioxide water
Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. the word equation that best represents this chemical reaction is isopropanol oxygen ---> carbon dioxide + water + heat. Option C. This is further explained below.
What are chemical reactions?Generally, A chemical reaction is simply defined as a process that converts compounds known as reactants into distinct substances, known as products.
In conclusion, In the presence of oxygen, isopropanol burns to produce carbon dioxide, water, and heat. This chemical reaction is best represented by the word equation isopropanol oxygen= Carbon dioxide + water + heat
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Answer:
C: isopropanol + oxygen -> carbon dioxide + water + heat
Use the word bank below to complete the statement. Not all of the words will be used.
Word Bank:
sum. Enthalpy. Heat. Total.
Temperature. Moles. -ΔH. +ΔH.
Hess’s Law describes how the ____ energy of a reaction consists of the ___ of the energy changes of the individual step reactions.
Answer:
Hess’s Law describes how the __Heat__ energy of a reaction consists of the _Enthalpy__ of the energy changes of the individual step reactions
Explanation:
Hess law is a legendary law which is given by
[tex]\\ \rm\Rrightarrow ∆H_{net}=\sum \delta H_r[/tex]
in a given homologous series of hydrocarbons, the boiling point generally increases as the size of the molecules increases. the best explanation for this statement is that in larger organic molecules
The boiling point of hydrocarbons generally increases as the size of the molecules increases because more bonds are needs to be broken in larger organic molecules.
What are hydrocarbons?Hydrocarbons are organic compounds which here composed of hydrogen and carbon alone.
Hydrocarbons are grouped into families or homologous series based on a reactive group known as the gincyiial group
The homologous series include
alkanesalkenes alkynesThe boiling point generally increases as the size of the molecules increases because more bonds are needs to be broken in larger organic molecules.
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,.,.,.,.,,.,.,..,,.,.,.,..,,..
Others would be the formation of precipitate, the release of energy, or change in odor.
The option that would lead to the formation of precipitation, release of energy or change in color is : Chemical change
Characteristics of Chemical changeChemical changes leads to the formation of precipitate in the form of bubbles, release of energy or change in color for example :
Rusting of Iron : As Iron rusts the color of the Iron will changeBoiling of liquid : As water or any other form of liquid boils the precipitate forms in the form of bubbles and energy in the form of heat is given offHence we can conclude that The option that would lead to the formation of precipitation, release of energy or change in color is : Chemical change
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When trees are cut down in a forest it increases the amount of runoff going into nearby streams and rivers true or false
When cooking in a convection oven, for best results you place your food in the center of the oven. This is because convection is energy transfer
A. by currents of moving liquid or gas
B. from a reaction system to its surroundings
C. by direct matter contact
D. by electromagnetic waves
This is because convection is energy transfer by currents of moving liquid or gas.
What is heat transfer by convection?
Heat transfer by convection is the transfer of heat from one place to another due to the movement of fluid.
When cooking in a convection oven, for best results you place your food in the center of the oven, this is because convection is energy transfer by currents of moving liquid or gas.
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This is because convection is a type of energy transfer by currents of moving liquid or gas (Option A).
What is convection?Convection is a physical natural phenomenon associated with energy transfer through a fluid.
In convection, a suitable fluid that produces what transfer can be for example air and/or water.
In conclusion, this is because convection is energy transfer by currents of moving liquid or gas (Option A).
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How is an unknown oxidation state of an element within a compound
determined?
O A. It will be the same in the products as in the reactants.
B. It will be the same as the charge on the compound.
C. It is always the same as the most likely oxidation state.
ОС
OD. It is determined from known oxidation states of other elem
Answer:
it is determined from known oxidation states of other elements
what is the molarity of liters of an aqueous solution that contains 0.50 mole of potassium iodide, KI
Answer:
The molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.HOW TO CALCULATE MOLARITY:The molarity of a solution can be calculated by dividing the number of moles by its volume. That is;Molarity = no. of moles ÷ volumeAccording to this question, 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide. The molarity is calculated as follows:Molarity = 0.50mol ÷ 2LMolarity = 0.25MTherefore, the molarity of 2.0 liters of an aqueous solution that contains 0.50 mol of potassium iodide is 0.25M.Learn more about molarity at: brainly.com/question/2817451
Explanation:
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Select the structure that corresponds
to the molecule name:
4-heptanone
A.
B.
O
CH3CH₂CH₂CCH₂CH3
C. both
The structure that corresponds to the molecule name - 4-heptanol would be option A.
Structure of 4-heptanolThe name, 4-heptanol, indicates that there are 7 carbon atoms in the structure.
In addition, there is also an indication that there is a functional group on the 4th carbon - the alcohol functional group.
Option B has only 6 carbon atoms instead of 7. Option A, on the other hand, fulfills all the criteria.
Thus, A is the correct structure of 4-heptanol.
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Zinc metal is added to hydrochloric acid to generate hydrogen gas and is collected over a liquid whose vapor pressure is the same as that of pure water at 20.0°C (18 torr). The volume of the mixture is 1.7 L, and its total pressure is 0.788 atm. Determine the number of moles of hydrogen gas present in the sample.
Answer:
About 0.054 moles.
Explanation:
Apply the ideal gas law. Recall that:
[tex]\displaystyle PV = n RT[/tex]
Solve for n, the number of moles:
[tex]\displaystyle n = \frac{PV}{RT}[/tex]
Determine the pressure of the hydrogen gas. Recall that by Dalton's Law of Partial Pressures, the total pressure is equal to the sum of the partial pressures of each individual gas:
[tex]\displaystyle P_T = P_\ell + P_\text{H$_2$}[/tex]
Convert the vapor pressure of the liquid to atm (1.00 atm = 760. torr):
[tex]\displaystyle 18\text{ torr} \cdot \frac{1.00\text{ atm}}{760.\text{ torr}} = 0.024\text{ atm}[/tex]
Therefore, the partial pressure of the hydrogen gas is:
[tex]\displaystyle \begin{aligned} P_T & = P_\ell + P_\text{H$_2$} \\ \\ (0.788\text{ atm}) & = (0.024\text{ atm}) + P_\text{H$_2$} \\ \\ P_\text{H$_2$} & = 0.764\text{ atm}\end{aligned}[/tex]
Therefore, the number of moles of hydrogen gas present is (the temperature in kelvins is 273.15 + 20.0 = 293.2 K):
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{(0.764\text{ atm})(1.7\text{ L})}{\left(0.08206 \text{ }\dfrac{\text{L-atm}}{\text{mol-K}}\right)(293.2\text{ K})}\\ \\ & = 0.054\text{ mol H$_2$} \end{aligned}[/tex]
define the term organic farming
Answer:
is agriculture that makes healthy food,healthy soil,healthy plants and healthy environments a priority,along with crop productivity
Please Help I need an explanation on how to do this
Balanced equation(That should be NaClO_3)
[tex]\\ \rm\Rrightarrow Cl_2+2NaOH\longrightarrow NaCl+NaClO_3+H_2O[/tex]
Remember that it's a ionic equation not general equation
So
We have to balance it accordingly
Answer:
Balanced equation(That should be NaClO_3)
\begin{gathered}\\ \rm\Rrightarrow Cl_2+2NaOH\longrightarrow NaCl+NaClO_3+H_2O\end{gathered}⇛Cl2+2NaOH⟶NaCl+NaClO3+H2O
Remember that it's a ionic equation not general equation
So
We have to balance it accordingly
When a chemical cold pack is activated, it becomes cool to the touch. What is happening in terms of energy?.
Answer:
An exothermic reaction is happening, it is absorbing the cold.
this fossil is evidence that insects lived on earth long ago
which of these modern insects is most likely to be the closest relative of the insect in the fossil ?
Answer:
c.
Explanation:
The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old, but the insect identity of the fossil has been contested. Global climate conditions changed several times during the history of Earth, and along with it the diversity of insects.
Answer:C
Explantion:This is The oldest insect fossil has been proposed to be Rhyniognatha hirsti, estimated to be 400 million years old
What are some applications of fission reactions? as a zero-waste energy source for generating large amounts of heat for creating stable elements from unstable ones for creating new, heavier elements as the energy source in nuclear weapons
Some applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.
What are nuclear fission reactions?Nuclear fission reactions are reactions in which the nucleus of heavier atoms are split into two or more atoms of smaller nucleus with the release of energy and radiation.
Some of the applications of fission reactions are as a zero-waste energy source for generating large amounts of heat and as the energy source in nuclear weapons.
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What is a physical change?
Answer:
A physical change is when something changes on the inside, but it does not change what it is made of.
H+ ion concentration of 2.5 x 10-5
Answer:
What is the hydrogen ion concentration of a solution labeled "Solution A", whose pH is 5.60?
Tutorial
In this problem we are given pH and asked to solve for the hydrogen ion concentration. Using the equation, pH = − log [H+] , we can solve for [H+] as,
− pH = log [H+] ,
[H+] = 10−pH,
by exponentiating both sides with base 10 to "undo" the common logarithm. The hydrogen ion concentration of "Solution A" is,
[H+] = 10−5.6 ≈ 0.0000025 = 2.51 × 10−6 M.
We can always check our solution by computing −log (2.5 × 10−6) ≈ 5.6.
20 Infer Check the box to show which would tell you for sure if you had a sample of real gold.
Color of your sample. Yes No
What happens when you strike your sample with a hammer.
The location where your sample was found.
Answer:
C but read the limitation
Explanation:
Gold sample
Color wouldn't tell you much. In fact it may fool you. Fool's Gold is the same color as gold.
Gold is very malleable. That's what hitting gold with a hammer will do. It tends to shape the gold without destroying it into lots of pieces. A lot of yellow things have that property.
If only it was that simply. Yes if you are sure there is gold in that location. You have to pick this answer, because the other 2 don't work. So this is possible, but not the best way. The best way is to subject the sample to chemical treatment. If you are left with a yellow sample, then you could make the case for it being gold.
What is the equilibrium constant equation for the chemical process below?
2A + B2 —> A₂B2
Let's see
[tex]\\ \rm\dashrightarrow k=\dfrac{Concentration\:of\: products}{Concentration\:of\: reactants}[/tex]
[tex]\\ \rm\dashrightarrow k=\dfrac{\left[A_2B_2\right]}{\left[A\right]^2\left[B\right]}[/tex]
let's say these four solutions have the same concentration, which one has the highest freezing point?
a) calcium chloride
b) glucose
c) sodium chloride
d) ammonium chloride
Answer:
c) Sodium chloride