The process in which water changes from a liquid to a vapor is known as __________.
Studies involving humans or animals are conducted under strict policies and procedures. This solution addresses which limitation?
A) Lack of proper equipment
B) Size of the system
C) Limited amount of time
D) Ethical Concerns
Answer:
D, concerns
Explanation:
edge 23
Suggest why the ph of the gut secretions varies at different regions in gut answer key anatomy
Answer:
The correct answer is because they work at different pH levels.
Explanation:
The pH varies because the different enzymes secreted in the stomach work at different pH levels. Gastric secretion is the most important stage of digestion since when the food comes into contact with a low pH and the enzymes present, they dissociate it and denature the proteins present.
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Ionic bonds are strong; therefore, ionic compounds
What type of reaction is responsible for linking amino acids together to form polypeptides?
What happens when the amoeba proteus is placed in distilled water?
The organic compound ketone contains which functional group?
A.) hydroxyl
B.) ester
C.) ether
D.) carbonyl
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what kind of room has no doors or windows?
The presence of the carbon-carbon double bond in eugenol can be tested using the bromine water test. write a balance equation for the reaction involved in this test?
an element can be identified as either a ________, __________, or a __________
Suppose you have a rock that, when it solidifies, contains 1 microgram of a radioactive isotope. how much of this isotope remains after five half-lives?
Newton believed _______ _______ were encoded alchemic recipes.
When a candle is burning is it a physical or chemical change?
When electrons move closer to a more electronegative atom, what happens? the more electronegative atom is _____?
What is the density of a mineral with a mass of 41.2g and a volume of 8.2 cm?
How many moles of carbon are in 3.5 moles of calcium carbonate? ______?
Answer : The number of moles of calcium carbonate are 3.5 moles.
Explanation : Given,
Moles of carbon = 3.5 mole
The chemical formula of calcium carbonate is, [tex]CaCO_3[/tex]
By the mole concept:
In [tex]CaCO_3[/tex], there are 1 mole of calcium (Ca) atom, 1 mole of carbon (C) atom and 3 moles of oxygen (O) atoms.
As, 1 mole of carbon present in 1 moles of [tex]CaCO_3[/tex]
So, 3.5 mole of carbon present in 3.5 moles of [tex]CaCO_3[/tex]
Hence, the number of moles of calcium carbonate are 3.5 moles.
The number of moles of Carbon contained in 3.5 moles of Calcium Carbonate is; 3.5 moles of Carbon.
According to the question;
We are required to determine How many moles of carbon are in 3.5 moles of calcium carbonate.
The chemical formula of Calcium Carbonate is; CaCO3.
In essence, Calcium Carbonate contains;
1 atom of Calcium1 atom of Carbon3 atoms of Oxygen.Consequently, since 1 mole of Calcium Carbonate contains 1 mole of Carbon.
By proportion, 3.5 moles of Calcium Carbonate must contain 3.5 moles of Carbon.
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6. Most traditional sources of energy come from the __________.
a. biosphere b. hydrosphere c. lithosphere d. atmosphere
A triacylglycerol is composed of 3 glycerol molecules joined to a fatty acid.
a. True
b. False
Which is an example of a chemical change?
a.the separation of a mixture into its components
b.the separation of a compound into its elements
c.the separation of gases from liquids
d.the separation of air into oxygen, nitrogen, and other components?
A chemical change involves the conversion of substances into different substances, as in the separation of a compound into its elements which requires breaking chemical bonds, unlike a physical change.
Explanation:An example of a chemical change is the separation of a compound into its elements. This process involves breaking chemical bonds and forming new substances with different properties than those of the original compound. For instance, table salt (a compound of sodium and chlorine) cannot be separated into sodium and chlorine by physical means like filtering or distillation; it requires a chemical process. In contrast, physical changes, such as the separation of a mixture or the condensation of steam, do not produce new substances and are reversible.
Burning of gasoline and the souring of milk are also examples of chemical changes, where original substances are transformed into new ones, such as carbon dioxide and water from gasoline, and denatured proteins and produced acid from milk.
A classic chemical change can be observed when natural gas is burned in a furnace, converting methane and oxygen into water and carbon dioxide, signifying not just a visual change but a molecular transformation as well.
What is the chemical formula for the compound formed between sodium and oxygen?
The chemical formula for the compound formed between sodium and oxygen is Na₂O, which is known as sodium oxide. Sodium reacts with oxygen to form this ionic compound.
Explanation:The compound that is formed when sodium and oxygen combine is known as sodium oxide. Its chemical formula is Na₂O. Sodium (Na) and oxygen (O₂) react together to form this compound. Sodium is a soft, silvery-white metal which reacts vigorously with oxygen to form Na₂O. Oxygen, a gas under standard conditions, reacts with sodium to form an ionic compound with properties entirely different from the constituent elements. Sodium oxide is a white, crystalline solid that is often used in ceramics and glasses.
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Why doesn't potassium fluoride conduct electricity as a solid?
Potassium fluoride doesn't conduct electricity as a solid because its ions are locked in a fixed crystal lattice structure, and aren't free to move. However, when dissolved or melted, the ions can move freely, making it a conductor. Another factor is the large band gap in its molecular orbitals which prevents easy movement of electrons.
Explanation:Potassium fluoride, like all ionic compounds, does not conduct electricity in its solid state because the ions in ionic solids are tightly held together by strong electrostatic attractions and thus, aren't free to move. The capacity to conduct electricity requires charged particles to move freely. In substances like potassium fluoride, these charges are locked in a fixed position within a crystal lattice structure.
However, this changes when potassium fluoride is either dissolved in water or melted, essentially when it is no longer in a solid state. In these cases, the ions of potassium and fluoride are free to move around and can carry an electric current. This freedom of movement of ions is referred as the substance being in a molten or dissolved state.
The concepts of valence and conduction bands in molecular orbitals of solids also play a role. In conductors, only a very small amount of energy is required to move electrons from the valence band to the conduction band whereas in insulators like potassium fluoride in its solid state, the band gap is large, making it a poor conductor of electricity.
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Which is the best description of the chemical reaction shown here in aqueous solution? ch3ch2cooh (aq) ↔ ch3ch2coo- (aq) + h+ (aq)?
Final answer:
The chemical reaction is an equilibrium reaction representing the partial dissociation of a weak acid, acetic acid, into acetate ions and hydrogen ions in aqueous solution.
Explanation:
The chemical reaction CH3CH2COOH (aq) ↔ CH3CH2COO- (aq) + H+ (aq) in aqueous solution is best described as the dissociation of a weak acid in water. This reaction is written as an equilibrium because it does not go to completion, and both the forward (dissociation) and reverse (re-association) reactions are occurring simultaneously. This reaction shows acetic acid partially ionizing in water to form acetate ions (CH3CH2COO-) and hydrogen ions (H+). The double arrows indicate that the reaction can proceed in both the formation and the re-formation of acetic acid. This behavior is common among weak acids, which do not completely dissociate in water.
In a titration, what is the name of the substance that is being determined?
Titration is done using a titrant and analyte. In a titration the name of the substance that is being determined is called the analyte.
What is titration?Titration is an analytical method of finding concentration of a solution using a known concentration of a standard reagent. The standard reagent is called titrant and the solution with unknown concentration is called analyte.
There are different types of titrations such as acid-base titration, complexometric titration, potentiometric titrations etc. All these need an indicator and used to determine the end point by a color change.
In acid-base titration, acid is taken in the burette and base in the pipette and using an indicator the end point is noted.
In complexometric titration, metal solutions are analyzed with an indicator capable of forming complex with the metal. In this way in all types of titrations the normality or molarity of the solution.
Hence, the substance being determined using titration is called analyte.
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How many moles al2o3 are needed to neutralize 1 mole of hcl?
Assuming stomach acid is 0.1 m hcl, how many grams of stomach acid would have been neutralized by your tablet (use the average value)?
HCl = 0.1 M.
find grams of Acid to neutralize the tablet.
n = 0.00739 mol of CO3-2.
D = 1.02 g/ml.
Find the moles of CO3-2.
CO3-2 + 2HCl <---> H2CO3 + 2Cl-.
therefore,
we need 2 mol of CO3-2 to neutralize 1 mol of HCl.
since we have 0.00739 mol of CO3-2, that will neutralize 2X mol of HCl.
2*0.00739 = 0.01478 mol of HCl will be neutralized.
Now, find the mass of Acid :
M = mol/V,
V = mol/M.
Substitute data of acid :
V = 0.01478 mol / 0.1 M = 0.1478 Liters of stomach acid
or 147.8 ml of stomach acid
now find mass:
D = mass/V.
mass = D*V = 1.02*147.8 = 150.76 grams of Stomach Acid will be neutralized
Calcium chlorate has the formula Ca(ClO3)2. Which best describes the structure of calcium chlorate? One molecule of calcium chlorate contains nine atoms. Calcium chlorate is an element that contains three atoms. It takes nine different elements to make one molecule of calcium chlorate. Calcium chlorate contains two Ca groups.
The formula Ca(ClO3)2 breaks down to 1 calcium atom, 2 chlorine atoms, and 6 oxygen atoms. One molecule of calcium chlorate contains 9 atoms. Thus the correct option is A.
How calcium chlorate is formed?Calcium chlorate is formed by passing chlorine gas through a hot suspension of calcium hydroxide in water, producing calcium hypochlorite, which disproportionate when heated with excess chlorine to give calcium chlorate and calcium chloride.
6 Ca(OH)2 + 6 Cl2 → Ca(ClO3)2 + 5 CaCl2 + 6 H2O
This is also the first step of the Liebig process for the manufacture of potassium chlorate. Liebig's method is used for the estimation of carbon and hydrogen.
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Which of the following types of pollution cannot be attributed to car and truck emissions?
A. Acid Rain
B. Sedimentation
C. Ozone
D. Photochemical Smog
(Also, I feel like I should know this, but we just started learning this.. so I don't know the answer to this.)
Please help!
Which term is defined as new substances formed from chemical reactions?
In what order do the levels get filled with electrons?
The first level must be filled with two electrons before electrons can be added to the second level.
(Plato users)
Which of the following compounds will produce H2O as one of the products when it decomposes?
a.) Hg(ClO3)2
b.) Cu(OH) 2
c.) CaO
d.) MgCO3
Cu(OH)2 will decompose to give water as one of the products
The decomposition reaction will be
Cu(OH)2(s) ----> CuO(s) + H2O(l)
Hence it is giving water as product