Answer is: C. The FDA tests give reliability to the results of improved health obtained by each company.
The FDA (The Food and Drug Administration) is a federal agency of the United States Department of Health and Human Services.
The FDA controls food safety, tobacco products, dietary supplements, prescription, pharmaceutical drugs, vaccines, biopharmaceuticals, blood transfusions, medical devices, electromagnetic radiation emitting devices, cosmetics and animal food.
In the compound cah2 calcium has an oxidation number of 2+ and hydrogen has an oxidation number of
The oxidation number of H is -1.
Sum of the oxidation numbers in each element = charge of the complex
CaH₂ has 1 Ca atom and 2H atoms. The charge of the complex is zero. Let’s say Oxidation number of H is "a".
Then,
(+2) + 2 x a = 0
+2 + 2a = 0
2a = -2
a = -1
Hence, the oxidation number of Hydrogen atom in CaH₂ is -1
In the compound CaH2, calcium has an oxidation number of +2, and hydrogen has an oxidation number of -1, balancing the charges. The oxidation states of elements in a compound like CaH2 influence their properties and reactivity.
Explanation:In the compound CaH2, calcium has an oxidation number of +2 and hydrogen has an oxidation number of -1.
Hydrogen usually has an oxidation number of +1 except when bonded to metals in hydrides where it is -1. This is the case in compounds like CaH2.
Each hydrogen atom in CaH2 carries a charge of -1, balancing with the +2 charge of calcium to maintain overall charge neutrality.
What is the celsius temperature of 100.0 g of chlorine gas in a 55.0-l container at 800 mm hg?
To calculate temperature of a gas, use the ideal gas law PV=nRT. Substitute the given values, including the number of moles calculated from the mass and molar mass of chlorine, and solve for the temperature. The result will be in Kelvin, so convert to Celsius.
Explanation:The celsius temperature of 100.0 g of chlorine gas in a 55.0-l container at 800 mm hg can be calculated by using the ideal gas law: PV = nRT. Here, P = Pressure = 800 mm hg (we must convert this to atmospheres by using the conversion factor 1 atm = 760 mm hg), V = volume = 55.0 liters, n = number of moles (which we can calculate by using chlorine's molar mass), R = ideal gas constant = 0.08206 L.atm/(mol.K), T = temperature (which is what we're solving for). After substitifying and calculating values, the final temperature would be expressed in Kelvin, which could be easily converted to Celsius by subtracting 273.15.
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When determining whether a chemical reaction has taken place, you observe and look for several indicators. Which would be considered an indication that a chemical reaction or chemical change has taken place?
A) Solid melts.
B) Heat is given off.
C) Substance dissolves
D) Substance changes shape.
the answer is b i just got it right on usatestprep
How many grams of lead (ii) chloride will dissolve in a 0.750 l of 0.650 m pb(no3)2 solution? the ksp of lead (ii) chloride is 1.7 x 10-5 ?
A chemical is classified as being volatile if it is __________.
A "fizz saver" pumps air under pressure into a soda bottle to keep gas from escaping. will this keep co2 in the soda bottle? explain your answer.
Answer:
yeah...what he/she said...lol
Explanation: I was going to say that anyways.....btw am i the only one who has a problem with chemistry right now??? I need a tutor right about now....like baddddd!!!!
A(n) ________ is the simplest form of lipid; it is a carbon chain, flanked by hydrogens, with an acid group at one end and a methyl group at the other end.
Final answer:
A fatty acid is the simplest form of lipid, consisting primarily of a carbon-hydrogen chain with an acid group on one end and a methyl group on the other.
Explanation:
A fatty acid is the simplest form of lipid. It consists mainly of chains of carbon and hydrogen atoms. At one end of this chain, there is an acid group (carboxylic acid), and at the other end, there is a methyl group. Fatty acids can exist alone or as monomers of larger lipid molecules such as triglycerides.
There are two types of fatty acids: saturated fatty acids, where the carbon chain is fully attached to hydrogen atoms since the carbons are connected by single bonds; and unsaturated fatty acids, where the carbon atoms are not bonded to as many hydrogen atoms as they possibly could be due to the presence of double or triple bonds between some adjacent carbon atoms.
A chef is going to use a mixture of two brands of italian dressing. the first brand contains 7% vinegar, and the second brand contains 11% vinegar. the chef wants to make 240 milliliters of a dressing that is 8% vinegar. how much of each brand should she use?
Answer is: 180 mL of 7% vinegar and 60 mL of 11% vinegar.
ω₁ = 7% ÷ 100% = 0.07.
ω₂ =
11% ÷ 100% = 0.11.
ω₃ =
8% ÷ 100% = 0.08.
V₁ = ?.
V₂ =
?.
V₃ =
V₁ + V₂.
V₃ = 240 mL.
V₁ = 240 mL - V₂.
ω₁ ·
V₁ + ω₂ ·V₂ =
ω₃ · V₃.
0.07 · (240 mL - V₂) + 0.11 · V₂ = 0.08 · 240 mL.
16.8 mL - 0.07V₂ + 0.11V₂ = 19.2 mL.
0.04V₂ = 2.4 mL.
V₂ = 2.4 mL ÷ 0.04.
V₂ = 60 mL.
V₁ = 240 mL - 60 mL.
V₁ = 180 mL.
the enthaply of a reaction can be measured using a ____
When iocnic solids dissolve in water, the break down into the ____ ions (cations) and ___ ions (anions) that they contain?
Which type of solute is present in aqueous solution predominantly as hydrated ions rather than as molecules?
Strong electrolytes better separates into particles (ions) in water because of their ionic bond.
For example sodium chloride is ionic compound and strong electrolyte and dissociates in water on hydrated sodium cations and chlorine anions:
NaCl(aq) → Na⁺(aq) + Cl⁻(aq).
Final answer:
The type of solute that predominantly exists as hydrated ions in an aqueous solution includes salts with small, highly charged ions like Mg²⁺, Al³⁺, SO₄²⁻, and PO₄³⁻. These ions are stabilized in solution through hydration by water molecules due to the polar nature of water, making it a powerful solvent for ionic compounds.
Explanation:
The type of solute that is present in an aqueous solution predominantly as hydrated ions rather than as molecules is typically composed of salts containing small, highly charged ions such as Mg²⁺, Al³⁺, SO₄²⁻, and PO₄³⁻. These ions have a greater tendency to form ion pairs due to strong electrostatic interactions, but in aqueous solutions, they are often found as hydrated ions surrounded by a shell of water molecules. Hydration helps to stabilize these solutions by preventing the positive and negative ions from reassociating and precipitating. This process is critical for understanding the behaviors of electrolytic solutions, where salt dissolves in water and dissociates into its component ions, leading to the formation of solvated ions which can conduct electricity.
The stabilization of ions in solution through hydration is fundamental to many chemical processes, including reactions in aqueous solutions and the biochemical activities inside cells. The water molecules' ability to surround and stabilize ions is largely due to the polar nature of water, arising from the differences in electronegativity between hydrogen and oxygen. This property makes water an excellent solvent for ionic compounds.
Object A has a density of 10 g/cm3 and a mass of 9 g. Object B has a density of 10 g/cm3 and a mass of 4 g. Which object has a greater volume and by how much?
there is a total of seventeen constitutional isomers for the molecular formula c5h13n. draw the skeletal formula of all three constitutional isomers that are tertiary amines.
The skeletal formulae for the three tertiary amines according to the molecular formula C5H13N are N(CH3)3, N(CH3)(C2H5), and N(CH3)(C3H7). These demonstrate the concept of constitutional isomerism in organic chemistry.
Explanation:Tertiary amines are those amines in which the nitrogen atom is bonded to three organic groups. In the context of the given molecular formula - C5H13N - the three constitutional isomers that are tertiary amines can be represented as follows:
N(CH3)3: The nitrogen atom here is bonded to three methyl groups. N(CH3)(C2H5): Here, the nitrogen atom is bonded to two methyl groups and one ethyl group. N(CH3)(C3H7): In this case, the nitrogen atom is bonded to one methyl group and one propyl group.To draw these, remember that each carbon atom is at the end of each branch and the N indicates the central nitrogen atom. The formation of these distinct structures from the same molecular formula demonstrates the concept of constitutional isomerism in organic chemistry.
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Which compound is most likely to have a sweet smell? which compound is most likely to have a sweet smell? ch3−ch2−nh2 o∥ch3−c−o−ch3 ch3−ch2−o−ch3 ch3−ch2−ch2−oh?
Compounds are substances made up of similar molecules with atoms of various elements. The atoms of two or more elements form bonds and combine to yield a compound.
[tex]\rm CH_{3} - CH_{2} -O - CH_{3}[/tex] will have a sweet smell.
What are the functional groups?Functional groups are specific atoms or molecules bonded with the compound that gives a characteristic property to a compound. Some examples are alcohols, amines, ethers, carboxylic acids etc.Ether [tex]\rm (R-O-R^{'})[/tex] is one of the functional groups with a sweet and pleasant smell that is a volatile and flammable compound and is used in solvent and other industrial processes.The compound [tex]\rm CH_{3} - CH_{2} -O - CH_{3}[/tex] is ether as it has the general formula of ether where the oxygen is linked with two different groups on its two sides.Therefore, option C. [tex]\rm CH_{3} - CH_{2} -O - CH_{3}[/tex] is the sweet-smelling compound.
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Question 3 given that au-197 is the only natural isotope of gold, what is the mass of one au atom and the mass of avogadro's number of au atoms, respectively? 196.97 g and 196.97 amu 197 amu and 197 g 197 g and 197 amu 196.97 amu and 196.97 g none of the above
Explanation:
The mass number of an element is a weighted average of all the isotopes of that element.
If Au has only one isotope then the atomic weight of that isotope matches the mass number.
Au-197 ==> mass number 197
Mass of one atom=mass number 197 amu
Mass of one mol of atoms:
[tex]m=197 amu*1.66054*10^{-24}g/amu*6.022*10^{23}[/tex]
[tex]m=196.97 g[/tex]
30 ml of 0.3 M NaOH are required to titrate H3PO4 to the equivalence point.How many moles of H3PO4 are needed to reach the equivalence point. Show steps please :)
The number of moles of H₃PO₄ needed to reach the equivalence point is 0.009 moles.
To find the number of moles of H₃PO₄ required to reach the equivalence point, we need to understand the stoichiometry of the reaction between NaOH and H₃PO₄. The balanced chemical equation for the reaction is:
[tex]\[ H_3PO_4 + 3NaOH \rightarrow Na_3PO_4 + 3H_2O \][/tex]
From the equation, we see that one mole of H₃PO₄ reacts with three moles of NaOH. Now, we are given that 30 ml of 0.3 M NaOH is required to titrate H₃PO₄ to the equivalence point.
First, we calculate the number of moles of NaOH used in the titration:
[tex]\[ \text{Moles of NaOH} = \text{Volume of NaOH (L)} \times \text{Molarity of NaOH} \][/tex]
Since the volume is given in milliliters, we need to convert it to liters:
[tex]\[ 30 \text{ ml} = 30 \times 10^{-3} \text{ L} \][/tex]
Now, we can calculate the moles of NaOH:
[tex]\[ \text{Moles of NaOH} = 30 \times 10^{-3} \text{ L} \times 0.3 \text{ M} \] \[ \text{Moles of NaOH} = 0.009 \text{ moles} \][/tex]
Since the stoichiometry of the reaction is 1 mole of H₃PO₄ to 3 moles of NaOH, the moles of H₃PO₄ required for the reaction is one-third of the moles of NaOH:
[tex]\[ \text{Moles of H}_3\text{PO}_4 = \frac{1}{3} \times 0.009 \text{ moles} \]\[ \text{Moles of H}_3\text{PO}_4 = 0.003 \text{ moles} \][/tex]
To react with all of the NaOH provided, we need three times this amount of H₃PO₄:
[tex]\[ \text{Moles of H}_3\text{PO}_4 = 0.003 \text{ moles} \times 3 \]\[ \text{Moles of H}_3\text{PO}_4 = 0.009 \text{ moles} \][/tex]
Therefore, 0.009 moles of H₃PO₄ are needed to reach the equivalence point with 30 ml of 0.3 M NaOH.
If an endothermic process absorbs 256j how many kilocalories are absorbed
Answer: 0.0612 kcalories
Explanation:
Endothermic processes are those processes in which heat is absorbed and exothermic processes are those processes in which heat is released.
Standard units for heat measurement are Joules and calories wherein
1 joule = 0.239 calorie.
As 1 Joule is equivalent to 0.239 calorie
256 Joules are equivalent to=[tex]\frac{0.239}{1}\times 256=61.2calories[/tex]
Now 1 cal = 0.001 kcalories
Therefore 61.2 calories=[tex]\frac{0.001}{1}\times 61.2=0.0612kcal[/tex]
Which technique is used to compare ink on a suspect document?
A) thin-layer chromatography
B) infrared spectrophotometry
C) blotting with alcohol method
D) ultraviolet spectrophotometry
The technique of thin-layer chromatography is used to compare ink on a suspect document. This is done by creating a chromatogram through exposing the ink to a solvent and observing the resulting pattern of spots.
Explanation:The technique used to compare ink on a suspect document is A) thin-layer chromatography. Thin-layer chromatography is a type of chromatography that is widely used to separate mixtures in forensic analysis. In this process, the ink sample from the suspect document is placed on a thin layer of absorbent material.
The sample is then exposed to a solvent, which moves up the stationary phase, carrying different components of the ink at different rates. This results in a series of spots, that form a chromatogram, can then be compared to known samples for identification.
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Draw the lewis structure for the molecule ch3ch2cch. how many sigma and pi bonds does it contain?
The molecule CH3CH2CCH has a Lewis structure of H3C-CH2-C≡CH. It contains 11 sigma bonds and 2 pi bonds, which represent the different forms of covalent bonds due to the overlap of atomic orbitals.
Explanation:The molecule CH3CH2CCH, also known as 1-Butyne, is composed of hydrogen (H) and carbon (C) atoms. Its Lewis structure can be represented as:
H3C-CH2-C≡CH.
Here, each line represents a bond between two atoms, which could be a sigma (σ) or a pi (π) bond. In the case of CH3CH2CCH, there are a total of 11 sigma bonds. You can see these as the bonds between H and C in the CH3 and CH2 groups, the single bond between the two C atoms in the center, and the bond between the last C and H atoms. As for the pi bonds, represented by two lines (double/triple bonds), there are 2, which can be seen in the triple bond of C≡C.
Sigma bonds represent the overlap of atomic orbitals to form a covalent bond, with the electron density concentrated along the internuclear axis. Conversely, pi bonds occur due to the side-by-side overlap of atomic orbitals where the electron density is concentrated on two parallel lines.
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Explain how solid naphthalene in mothballs is distributed evenly through clothes in a drawer
which energy source has been developed and improved by chemist
Answer:
Nuclear energy
Explanation:
There are many sources of energy available in nature which are harnessed by humans for their use. Some of these sources are present in abundant quantity (solar energy) while others take million of years to renew (coal and petroleum).
Nuclear energy is generated when two nuclei fuse into a larger nuclei (nuclear fusion) or a large nuclei dissociates into smaller ones (nuclear fission) .
A small quantity of nuclear fuel produces a large amount of energy. It is difficult to control the energy production process on which chemist hve worked. Also, the disposal of radioactive waste produced was also a challenge.
A certain radioactive material has a half-life of 36 minutes. Starting with 10.00 grams of this material, how many grams will be left after 2 hours?
A) 1.00 grams
B) 1.5 × 10-4 grams
C) 3.33 grams
D) 0.25 gram
Answer: The correct answer is C) 3.33 grams
Explanation: 1/8 of the initial 10 grams is a little more than 1 gram, while 1/16 of 10 grams is a little more than 1/2 gram. The only answer that falls in that range is 1.00 gram. Use the integrated rate equation: ln(g0/gt) = kt, also ln(2) = kt1/2. Therefore k = (0.693)/36 min = 0.0193 min-1. In addition to the specific chemical properties that distinguish different chemical classifications, chemicals can exist in several phases. For the most part, the chemical classifications are independent of these bulk phase classifications; however, some more exotic phases are incompatible with certain chemical properties. A phase is a set of states of a chemical system that have similar bulk structural properties, over a range of conditions, such as pressure or temperature. Physical properties, such as density and refractive index tend to fall within values characteristic of the phase. The phase of matter is defined by the phase transition, which is when energy put into or taken out of the system goes into rearranging the structure of the system, instead of changing the bulk conditions.
Sometimes the distinction between phases can be continuous instead of having a discrete boundary' in this case the matter is considered to be in a supercritical state. When three states meet based on the conditions, it is known as a triple point and since this is invariant, it is a convenient way to define a set of conditions.
The most familiar examples of phases are solids, liquids, and gases. Many substances exhibit multiple solid phases. For example, there are three phases of solid iron (alpha, gamma, and delta) that vary based on temperature and pressure. A principal difference between solid phases is the crystal structure, or arrangement, of the atoms. Another phase commonly encountered in the study of chemistry is the aqueous phase, which is the state of substances dissolved in aqueous solution (that is, in water).
A solid fuel designed for a rocket has an air pocket inside. What is the DANGER OF THIS?
A. The rocket might not generate enough lift
B. The rocket might slow down and fall from space
C. The rocket might explode from the added pressure when the combustion reaction hits the air pocket
D. the rocket might not be able to regulate its speed
Answer:
C. The rocket might explode from the added pressure when combustion reaction hits the air pocket.
Explanation:
Correct answer for *APEX quiz!
The rocket might explode from the added pressure when combustion reaction hits the air pocket. Hence, option C is correct.
What is combustion?Combustion is another word for burning. In a combustion reaction, a fuel is heated and it reacts with oxygen.
In a rocket engine , fuel and a source of oxygen, called an oxidizer, are mixed and exploded in a combustion chamber.
The combustion produces hot exhaust which is passed through a nozzle to accelerate the flow and produce thrust.
Hence, option C is correct.
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Which type of van der walls force is responsible for holding polar molecules together? london dispersion dipole-dipole hydrogen bonding gravitational force?
Answer:
dipole-dipole
Explanation:
Polar molecules are formed as result of covalent bonds between atoms.
Dipole-dipole attraction are intermolecular bonds. Both London dispersion forces and dipole-dipole attraction are van der waals forces.
In dipole-dipole attraction, polar molecules (unsymmetrical molecules) line up such that the positive pole of one molecule attracts the negative pole of another. Example of such is found in HCl.
Answer:
Dipole-dipole forces are the van der Waals forces that hold polar molecules together!!
The molar mass of I2 is 253.80 g/mol and the molar mass off NI3 is 394.71 g/mol. how many moles of I2 will form 3.58 g of NI3
The moles of I₂ that will form 3.58 g of NI₃ is 0.0135 moles
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Molar mass of I₂ = 253.8 g/mol
Molar mass of NI₃ = 394.71 g/mol
N₂ + 3I₂ = 2NI₃
Mass of NI₃ = 3.58g
Moles of NI₃ = mass / molar mass
= 3.58 / 394.71
= 0.009 moles
from the reaction, 2 moles of NI₃ need 3 moles of I₂
1 mole of NI₃ will need 3/2 moles of I₂
So, 0.009 moles of NI₃ will need = 1.5 × 0.009 = 0.0135 moles of I₂
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what is fry's reagent used for?
Fry's reagent is a chemical tool used to detect aldehydes through a color change to bright magenta, offering a simple and fairly reliable test for the presence of these functional groups in various chemical applications.
Fry's reagent is a chemical reagent commonly used in a method to detect aldehydes. It consists of a decolorized fuchsin dye that can be activated by sulfur dioxide. When Fry's reagent comes into contact with aldehydes, it will cause a color change to bright magenta, indicating the presence of these functional groups. This method is known for its simplicity and reliability, although it is important to note that it might not always produce clear-cut results as anticipated.
Detecting aldehydes is crucial in various applications, such as confirming the presence of specific biomolecules in biochemistry or determining the purity of chemical compounds in synthetic chemistry. The color change of Fry's reagent provides a visual cue that can be quickly interpreted by researchers.
When calcium carbonate is heated strongly, it forms calcium oxide and carbon dioxide. what mass of calcium carbonate is needed to make 50.0 g of calcium oxide?
To produce 50.0 g of calcium oxide, 89.29 g of calcium carbonate is required. The amount is calculated based on the fixed ratio of the decomposition reaction of calcium carbonate, which aligns with the law of conservation of mass.
To determine the mass of calcium carbonate ([tex]CaCO_3[/tex]) needed to produce 50.0 g of calcium oxide (CaO), it's essential to refer to the stoichiometry of the chemical reaction. The balanced chemical equation for the decomposition of calcium carbonate is:
[tex]CaCO_3(s) \rightarrow CaO(s) + CO_2(g)[/tex]From the given examples, we can deduce that when 10.0 g of calcium carbonate decompose, they produce 5.6 g of calcium oxide. This means there is a fixed ratio of mass of calcium carbonate to calcium oxide, which is:
Mass of CaCO3 : Mass of CaO = 10.0 g : 5.6 gTo produce 50.0 g of calcium oxide, we can set up a proportion based on the fixed ratio:
10.0 g CaCO3 / 5.6 g CaO = x g CaCO3 / 50.0 g CaOBy solving for x, which represents the mass of calcium carbonate needed, we can cross-multiply and divide to find the answer:
[tex]x = (10.0 g CaCO3 \times 50.0 g CaO) / 5.6 g CaO[/tex]x = 89.29 g of CaCO3
Therefore, to obtain 50.0 g of calcium oxide, you would need 89.29 g of calcium carbonate. This calculation is in agreement with the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction.
The plant structure that helps transport water and nutrients from the roots to the leaves and other parts of the plant is
A. stamen
B. xylem
C. pistil
D. phloem
The answer to your question is Xylem
Write the equation for the dissolution of sr(no3)2 in water. how many moles of strontium ions and nitrate ions are produced by dissolving 0.5 mol of strontium nitrate?
Answer: Moles of strontium and nitrate ions formed by dissolving 0.5 moles of strontium nitrate in water are 0.5 moles and 1 mole respectively.
Explanation:
We are given a chemical compound known as strontium nitrate having chemical formula [tex]Sr(NO_3)_2[/tex]. This is an ionic compound and when it is dissolved in water, it will dissociate into its respective ions.
We are given:
Moles of strontium nitrate = 0.5 moles
The chemical equation for the ionization of strontium nitrate follows:
[tex]Sr(NO_3)_2(aq.)\rightarrow Sr^{2+}(aq.)+2NO_3^-(aq.)[/tex]
By Stoichiometry of reaction:
1 mole of strontium nitrate produces 1 mole of strontium ions and 2 moles of nitrate ions.
So, 0.5 moles of strontium nitrate will produce = [tex](1\times 0.5)=0.5mol[/tex] of strontium ions and [tex](2\times 0.5)=1mol[/tex] of nitrate ions.
Hence, moles of strontium and nitrate ions formed by dissolving 0.5 moles of strontium nitrate in water are 0.5 moles and 1 mole respectively.
Renewable resources are those that can be synthesized by humans. True or False?
Answer:
False
Explanation:
But with proper argument both sides have a point. Yes, the earth naturally makes there energy sources, but with out human motivation and work ethic we wouldn't have the power to harness the energy and use it in our every day lives. But the answer is FALSE