The weighted average of the mass numbers of all the isotopes that occur in nature for particular element is the average atomic number true or false
What is the volume, in mL, of 0.50 moles of ammonia (NH3) at STP?
A. 1120 L
B. 22.32 mL
C. 8500 mL
D. 11,200 mL
Final answer:
The volume of 0.50 moles of ammonia at STP is calculated by multiplying the number of moles by the standard molar volume (22.41 L) resulting in 11,205 mL, making option D (11,200 mL) the closest correct answer.
Explanation:
To find the volume of 0.50 moles of ammonia (NH₃) at STP, we use the concept of the standard molar volume of a gas. The standard molar volume is the volume occupied by one mole of any gas at Standard Temperature and Pressure (STP), which is defined as 0°C (273 K) and 1 atm pressure. For any ideal gas, which includes ammonia under these conditions, this volume is 22.41 liters (L).
Therefore, to calculate the volume occupied by 0.50 moles of NH₃ at STP, we multiply the number of moles by the standard molar volume:
Volume = 0.50 moles × 22.41 L/moleVolume = 11.205 LSince the question asks for the volume in milliliters (mL), we convert liters to milliliters by remembering that 1 L = 1000 mL:
Volume = 11.205 L × 1000 mL/LVolume = 11,205 mLTherefore, the correct answer is D. 11,200 mL, which is the closest to our calculated volume of 11,205 mL.
What coefficients are needed to balance the following equation?
H2O + Fe Fe2O3 + H2
The coefficients needed to balance the equation H2O + Fe → Fe2O3 + H2 are 4H2O + 3Fe → Fe2O3 + 4H2. These coefficients ensure the number of atoms of each element is the same on both sides of the equation.
Explanation:To balance the equation H2O + Fe → Fe2O3 + H2, we need to ensure that the number of each type of atom on the left side of the equation matches the number on the right side. The balanced equation would be: 4H2O + 3Fe → Fe2O3 + 4H2. Here, we are using stoichiometry which is a part of chemical reactions. In balancing chemical equations, coefficients are used in front of the chemical formulas to indicate the number of molecules or atoms involved in the reaction.
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What PROPERTIES of elements visibly show periodic trends when their values are graphed?
Final answer:
Properties of elements that visibly show periodic trends when their values are graphed include atomic size, ionization energy, and electron affinity.
Explanation:
The properties of elements that visibly show periodic trends when their values are graphed include atomic size, ionization energy, and electron affinity.
Atomic size, or atomic radius, generally increases as you move down a group (vertical column) in the periodic table. This is because additional energy levels or electron shells are added as you move down, resulting in larger atomic size.
On the other hand, ionization energy, which is the energy required to remove an electron from an atom, generally increases as you move across a period (horizontal row) from left to right in the periodic table. This is because the atomic size decreases and the attraction between the positively charged nucleus and the negatively charged electron increases, making it more difficult to remove an electron.
Lastly, electron affinity, which is the energy change when an atom gains an electron, also shows periodic trends. Electron affinity generally becomes more negative (increases) as you move across a period from left to right, except for a few exceptions. This is because atoms on the right side of the periodic table have a higher effective nuclear charge, which makes it easier for them to attract and gain electrons.
Which statement describes a process involved in the evolution of Earth’s early atmosphere?
- Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis.
- Heavier gases escaped through Earth’s atmosphere, leaving only lighter gases such as oxygen behind.
- Volcanic eruptions produced enough oxygen to create Earth’s atmosphere.
- The amount of oxygen in the atmosphere declined due to respiration, or breathing.
The early atmosphere was reducing but became oxidizing when Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis.
What was the nature of the early atmosphere of the earth?The early atmosphere of the earth was a reducing in nature unlike the present atmosphere.
Changes that occurred in the organisms on earth helped to convert the early atmosphere to an oxidizing one.
Cyanobacteria transformed carbon dioxide in the atmosphere into oxygen during photosynthesis thereby releasing oxygen into the atmosphere and making it oxidizing in nature.
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What is the IMA of the inclined plane shown?
6
3
6.75 (not the answer)
Answer:
[tex]IMA = 3[/tex]
Explanation:
The ideal mechanical advantage of the inclined plane is:
[tex]IMA = \frac{L}{h}[/tex]
[tex]IMA = \frac{4.5\,m}{1.5\,m}[/tex]
[tex]IMA = 3[/tex]
What is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide?
Calcium nitrate is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide.
What is salt?Sodium chloride (NaCl), a mineral component important to health of humans and animals as well as business. To differentiate it from a family of chemical compounds known as salts, the crystalline type halite, meaning rock salt, is often referred to as common salt.
Table salt, which is widely used as a condiment, is fine-grained as well as of high purity. Small amounts of potassium aluminosilicate, tricalcium phosphate, and magnesium silicate are added to guarantee that such a hygroscopic compound remains free-flowing while exposed to the atmosphere. Calcium nitrate is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide.
Therefore, calcium nitrate is the chemical formula of the salt produced by the neutralization of nitic acid calcium hydroxide.
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How many liters of carbon dioxide will be formed from the decomposition of 14.1g of calcium carbonate (at stp)?
Firstly, according to Ideal Gas Law the volume of 1 mole of a gas at Standard Temperature and Pressure (STP) is 22.4 [tex] dm^{3} [/tex], ie the value of the molar volume (Vm) is 22.4 [tex] dm^{3} [/tex]/mol.
[tex]CaCO_{3} = CaO + CO_{2} [/tex]
From the reaction, it can be seen that [tex]CaCO_{3} [/tex] and [tex]CO_{2} [/tex] have the following amount of substance relationship:
[tex]n(CaCO_{3}) = n(CO_{2}) = 1:1[/tex]
From the relationship we can determinate moles of [tex]CO_{2} [/tex] :
[tex]n(CaCO_{3}) = n(CO_{2}) = n/M= 14.1/100=0.141 moles[/tex]
Finally, we can calculate the volume of formed CO2:
V([tex]CO_{2} [/tex] )=nxVm=0.141x22.4=3.16 [tex] dm^{3} [/tex]
The compound diborane (b2h6) was at one time considered for use as a rocket fuel. its combustion reaction is b2h6(g) + 3 o2(â) â 2 hbo2(g) + 2 h2o(â) the fact that hbo2, a reactive compound, was produced rather than the relatively inert b2o3 was a factor in the discontinuation of the investigation of the diborane as a fuel. what mass of liquid oxygen (lox) would be needed to burn 106.3 g of b2h6?
To burn 106.3 g of diborane (B₂H₆), 368.64 g of liquid oxygen (LOX) would be required. This is calculated based on the stoichiometry of the balanced chemical combustion reaction.
Explanation:To calculate the mass of liquid oxygen (LOX) needed to burn 106.3 g of diborane (B₂H₆), we must first use the balanced chemical equation for the combustion of diborane:
B₂H₆ (g) + 3 O₂ (g) → 2 HBO₂ (g) + 2 H₂O (l)
From the equation, we can see that 1 mole of B₂H₆ reacts with 3 moles of O₂. First, determine the molar mass of B₂H₆ which is (2 × 10.81) + (6 × 1.008) = 27.7 g/mol. Now, divide the given mass of B₂H₆ by its molar mass to get the number of moles of B₂H₆:
106.3 g B₂H₆ × (1 mol B₂H₆/27.7 g) = 3.84 moles of B₂H₆
Now calculate the moles of O₂ required using the stoichiometry of the reaction (3 moles of O₂ per mole of B₂H₆):
3.84 moles of B₂H₆ × 3 moles O₂/1 mole B₂H₆ = 11.52 moles O₂
Finally, calculate the mass of O₂ using the molar mass of O₂ which is (2 × 16.00) = 32.00 g/mol:
11.52 moles of O₂ × 32.00 g/mol = 368.64 g of O₂
So, 368.64 g of LOX would be needed to burn 106.3 g of diborane (B₂H₆).
If 36.0 g of mgso4⋅7h2o is thoroughly heated, what mass of anhydrous magnesium sulfate will remain?
Answer: The mass of anhydrous magnesium sulfate that will remain is 17.6 grams.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] .....(1)
Given mass of [tex]MgSO_4.7H_2O[/tex] = 36.0 g
Molar mass of [tex]MgSO_4.7H_2O[/tex] = 246.47 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of }MgSO_4.7H_2O=\frac{36.0g}{246.47g/mol}=0.146mol[/tex]
The chemical equation for the heating of [tex]MgSO_4.7H_2O[/tex] follows:
[tex]MgSO_4.7H_2O\rightarrow MgSO_4+7H_2O[/tex]
By Stoichiometry of the reaction:
1 mole of [tex]MgSO_4.7H_2O[/tex] produces 1 mole of anhydrous magnesium sulfate.
So, 0.146 moles of [tex]MgSO_4.7H_2O[/tex] will produce = [tex]\frac{1}{1}\times 0.146=0.146mol[/tex] of anhydrous magnesium sulfate
Now, calculating the mass of anhydrous magnesium sulfate by using equation 1, we get:
Molar mass of anhydrous magnesium sulfate = 120.37 g/mol
Moles of anhydrous magnesium sulfate = 0.146 moles
Putting values in equation 1, we get:
[tex]0.146mol=\frac{\text{Mass of anhydrous magnesium sulfate}}{120.37g/mol}\\\\\text{Mass of anhydrous magnesium sulfate}=(0.146mol\times 120.37g/mol)=17.6g[/tex]
Hence, the mass of anhydrous magnesium sulfate that will remain is 17.6 grams.
How many calories does unsaturated fat provide per gram?
What determines the color of the egg shell ?
How many molecules of glucose are produced by each cycle of the light reaction?
With the addition of solar energy, the overall chemical reaction for photosynthesis is 6 molecules of carbon dioxide (CO2) and 6 molecules of water (H2O). This results in the formation of 1 molecule of glucose (C6H12O6) and 6 molecules of oxygen (O2).
What is glucose ?Glucose is the most common type of sugar found in the blood and the primary source of energy for the body's cells. Glucose comes from the foods we eat, or it can be produced by the body from other substances.
So, Six "turns" of the Calvin cycle combine six carbon atoms from six CO2 molecules with 12 "hot hydrogens" from NADPH using chemical energy from ATP. C6H12O6 is the resulting molecule of glucose.
Light energy is used in photosynthesis to convert carbon dioxide and water into glucose and oxygen. 1 glucose molecule and 6 oxygen molecules are produced for every 6 carbon dioxide and 6 water molecules.
Thus, 1 molecules of glucose are produced by each cycle of the light reaction.
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A 2.00 g sample of a bromine oxide (brxoy) is converted to 2.94 g of agbr. all the bromine in the original oxide compound ends up in the agbr (molar mass for agbr = 187.8). determine the empirical formula of the bromine oxide.
The chemical breakdown of enormous quantities of organic material buried in the sedimentary rocks has produced ____ gas.
Answer: Methane
Explanation:
The sedimentary rocks includes enormous amounts of organic matter that is produced by the decomposition and degradation of the dead matter from plants and animals. These rocks may exhibit methane gas a valuable fossil fuel. It is a greenhouse gas. The burning of one molecule of this gas produces one molecule of carbon dioxide and two molecules of water.
Actions of the non-valence electrons, diluting the force of the attraction between nucleus and valence electrons is called
A six carbon carbohydrate would have how many hydrogen atoms?
How does recycling wood products help maintain the supply of forestland for a longer period of time?
A. Recycling increases the consumption of new wood.
B. Recycling increases the cost of new wood.
C. Recycling reduces the supply of new wood.
D. Recycling reduces the demand for new wood.
Recycling reduces the demand for new wood is correct
Answer:
D
Explanation:
Which of the following describes a saturated solution?
A. One containing 1 g of sugar in 100 mL of water.
B. One that contains as much solute as it can hold at a given temperature.
C. One that contains less solute than it can hold at 25oC.
D. One in which the ratio of solute to solvent is small.
E. One that is equivalent to a supersaturated solution.that is equivalent to a supersaturated solution.
Final answer:
The correct answer is B. One that contains as much solute as it can hold at a given temperature. This is because a saturated solution is exactly that; it has reached its solubility limit for solute at a specific temperature and cannot dissolve any more of that solute.
Explanation:
A saturated solution is one in which the maximum amount of solute that can be dissolved by the solvent at a given temperature has been reached. If no more solute can be dissolved at that temperature, the solution has reached its solubility limit. This is in contrast to an unsaturated solution, where less solute is dissolved than the solvent can hold at that temperature. Furthermore, a supersaturated solution contains more solute than the normal solubility limit due to special circumstances, such as being carefully cooled after being heated to dissolve the extra solute, but this is not a stable state.
Considering the options provided:
A. This is an example of a solution but does not specify if it is saturated or not.B. One that contains as much solute as it can hold at a given temperature. This is the correct definition of a saturated solution.C. This describes an unsaturated solution.D. This statement is about dilution, which does not indicate saturation.E. A supersaturated solution is different from a saturated solution as it contains more solute than what is normally possible at a given temperature.what substance is considered to be the "universal" solvent? why?
Water is called the "universal solvent" due to its ability to dissolve many substances, which is crucial for supporting life. This is because of the polar nature of water molecules that allows them to interact with various compounds, making water indispensable for chemical reactions in the body and ecosystems.
Explanation:Water (H₂O) is often referred to as the "universal solvent" because of its exceptional ability to dissolve many different substances, which is essential for life. This property is due to the polar nature of water molecules, which have a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms.
Solvent power is one of water's significant features; it can form true solutions with many substances, resulting in homogeneous mixtures. Water's polarity enables it to dissolve not only polar and ionic compounds, which are hydrophilic or "water-loving," but also to interact with nonpolar compounds, albeit less readily.
Water's ability to dissolve a myriad of substances makes it an ideal environment for cellular components to react and facilitate chemical reactions necessary for life. Moreover, water's role as a solvent is crucial in biological systems where it dissolves nutrients and other essential compounds, facilitating their transport and chemical reactions within the body.
In the Lewis dot structure for NH3, the central atom of the molecule has three atoms bonded to it and one lone pair of electrons. mc006-1.jpg The shape of an NH3 molecule is
Answer:
Trigonal pyramidal
Explanation:
Edge
an example of an empirical formula
Which of these is a property of liquids?
I. viscosity
II. surface tension
III. volatility
I and II
II and III
I and III
I, II, and III
Benzene is the simplest example of _____ compound.
i know the answer is aromatic but can someone explain why please
If you inherit half of your genes from your mother and half of your genes from your father, what percent of your genes did you inherit from each of your grandparents?
Final answer:
An individual inherits approximately 25% of their genes from each grandparent. Environmental factors and personal experiences further contribute to variations from parents. Nuclear DNA is inherited evenly from both parents, while mitochondrial DNA is solely from the mother.
Explanation:
Every individual inherits 50% of their genes from each parent. Consequently, the genes you get from your mother will include half of her genetic material, of which 50% is derived from her father (your maternal grandfather) and 50% is derived from her mother (your maternal grandmother).
The same pattern applies to your father's contribution to your genes - half from your paternal grandfather and half from your maternal grandmother. Therefore, you inherit about 25% of your genes from each grandparent.
Personal experiences and the environment play significant roles in making you different from your parents despite the genetic similarities. These factors contribute to the unique expression of your genes, resulting in individual variations in appearance, personality, and other traits.
Moreover, it's important to distinguish between nuclear DNA, which follows the 50% inheritance from each parent, and mitochondrial DNA (mtDNA), which is inherited exclusively from the mother.
Write the formula for the polyatomic ion of ba3(po4)2: express your answer as an ion. express single charges as [+], not [1+]
The polyatomic ion in Ba3(PO4)2 is PO4^3-. To construct the formula for an ionic compound with polyatomic ions, the formula for the polyatomic ion is enclosed in parentheses if it is needed in more than one quantity, and the subscript representing the quantity is placed outside the parentheses.
Explanation:The formula for the polyatomic ion in Ba3(PO4)2 is PO43-.
The whole compound Ba3(PO4)2 is composed of barium ions (Ba2+) and phosphate ions (PO43-).
Since barium has a charge of 2+ and phosphate has a charge of 3-, for the charges to balance in Ba3(PO4)2, we need three barium ions to balance the charge of two phosphate ions.
Each phosphate ion is a group of one phosphorus atom and four oxygen atoms carrying a net charge of 3-.
When writing the formula for a compound with more than one polyatomic ion, the formula of the polyatomic ion must be enclosed in parentheses with the appropriate numerical subscript outside the parentheses.
This subscript indicates the number of polyatomic ions in the compound.
Hence, the compound name calcium phosphate is represented by the formula Ca3(PO4)2, where three calcium ions balance the charge of two phosphate ions.
The reaction that takes place when iron metal combines with aqueous hydrochloric acid.
A scientist is measuring the rate of an enzyme-catalyzed reaction that produces a red-colored product. as the solution containing the product becomes more concentrated, how do you predict absorbance (a) and transmittance (t) to change?
Answer: Absorbance will increase; Transmittance will decrease
Explanation:
According to the Beer-Lambert law the attenuation of light depends on the material it is travelling through. The Beer-Lambert Equation is defined by A = ε l c.
A = Absorbance of light by the material
ε = molar extinction co-efficient of the material
l = path length of light
c= concentration of the material
In this case the material is the substance producing red color.
From the above equation absorbance (A) is directly proportional concentration, then absorbance will increase with increase in concentration of the product.
Transmittance (t) is the amount of light able to be transmitted through the material. Thus absorbance and transmittance are inversely proportional and defined by the Equation: Absorbance = 2 - log (%T)
%T = Fraction of light that is transmitted, an increase in absorbance will cause a decrease in transmittance.
In glycolysis, one molecule of glucose containing 6 carbons is converted to two molecules of ________ containing 3 carbons each. this reaction also yields two molecules of _______ and two molecules of _______.
Scientists' evidence for an expanding universe is called a (blueshift, yellowshift, redshift, greenshift) because the light waves emitted by stars and galaxies are shifting toward the (yellow, blue, green, red) end of the visible color spectrum.
Answer: Expansion of universe is called the red shift and the light emitted by stars and galaxies is red light.
Explanation: As the universe is expanding, the relative distance is increasing from the Earth, hence causing an increase in the wavelength.
Red shift occurs when there is increase in wavelength. Hence, the light will shift towards the red end of the visible light.
The stars and galaxies are also farther away from the Earth, hence they also have a larger wavelength and will shift the light to the red end of the visible spectra.