Au₂S₃
Explanation:
Given compounds:
Gold(I) oxide = Au₂O
Gold(I)sulfide = Au₂S
Gold(III) oxide = Au₂O₃
Gold(III)sulfide = Au₂S₃
Problem: compound with the least mass of Gold.
To solve this problem, we simply find the mass percentage of gold in the given compounds.
Molar mass of Au₂O = 2(197) + 16 = 410g/mole
Molar mass of Au₂S = 2(197) + 32 = 426g/mole
Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole
Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole
The molar mass of gold in all the compound is 394g/mole
Mass percentage of gold in Au₂O = [tex]\frac{394}{410}[/tex] x 100 = 96.1%
Mass percentage of gold in Au₂S = [tex]\frac{394}{426}[/tex] x 100 = 92.5%
Mass percentage of gold in Au₂O₃ = [tex]\frac{394}{442}[/tex] x 100 = 89.1%
Mass percentage of gold in Au₂S₃ = [tex]\frac{394}{490}[/tex] x 100 = 80.4%
Au₂S₃ is the least mass of gold in it
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Answer:
Explanation:
Given compounds:
Gold(I) oxide = Au₂O
Gold(I)sulfide = Au₂S
Gold(III) oxide = Au₂O₃
Gold(III)sulfide = Au₂S₃
Problem: compound with the least mass of Gold.
To solve this problem, we simply find the mass percentage of gold in the given compounds.
Molar mass of Au₂O = 2(197) + 16 = 410g/mole
Molar mass of Au₂S = 2(197) + 32 = 426g/mole
Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole
Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole
The molar mass of gold in all the compound is 394g/mole
Mass percentage of gold in Au₂O = x 100 = 96.1%
Mass percentage of gold in Au₂S = x 100 = 92.5%
Mass percentage of gold in Au₂O₃ = x 100 = 89.1%
Mass percentage of gold in Au₂S₃ = x 100 = 80.4%
Au₂S₃ is the least mass of gold in it
As light travels from air to water to gas
Witch is the best example of natural selection ?
A . Some insects in a population survive temperature changes and pass their traits on to their offspring
B . A deer population is rapidly killed off by a forest fire.
C. A few mice from population randomly die from a disease, while surviving mice are not able to reproduce and slowly die off.
D. An injured bald eagle is captured and placed in a wildlife where it survives for 10 years
How many atoms are there in NaCI
Patrick is giving a presentation on thermal energy to his class. How can he use the terms endothermic and exothermic to explain the
change in thermal energy from one substance to another? Give an example of each term. EXPLAIN
Answer:
In the study of thermochemical processes, things are viewed from the point of view of the system. A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings and so the temperature of the surroundings decreases. The quantity of heat for a process is represented by the letter q . The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings is gaining heat from the system, the temperature of the surroundings increases. The sign of q for an exothermic process is negative because the system is losing heat.
Explanation:
Patrick can use the terms exothermic and endothermic to explain changes in thermal energy. Exothermic processes release heat into the environment, like burning wood, while endothermic processes absorb heat, like melting ice.
Explanation:Patrick can explain the change in thermal energy from one substance to another using endothermic and exothermic processes. An exothermic process is one in which heat is released into the surrounding environment. An example of this is the burning of wood in a fireplace where heat is given off as the wood burns, increasing the thermal energy in the room. On the other hand, an endothermic process is one in which heat is absorbed from the surroundings. An example is the melting of ice, which takes heat from the surrounding environment, reducing its thermal energy, to change from a solid to a liquid state. By using these terms, Patrick can effectively explain changes in thermal energy.
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Giving Brainliest
What type of rock is pumice? Describe how a pumice rock is likely to change over a long period of time.
Answer:
Pumice is pyroclastic igneous rock that was almost completely liquid at the moment of effusion and was so rapidly cooled that there was no time for it to crystallize. When it solidified, the vapors dissolved in it were suddenly released, the whole mass swelling up into a froth that immediately consolidated.
With time the pumice rocks undergoes with several changes including weathering, erosion, and transportation. The extent of heat and pressure, making the sediments of the pumice rocks into metamorphic rocks distinct in the chemical and physical composition of the parent material
Natural selection is the primary mechanism of _______.
A.
reproduction
B.
biodiversity
C.
adaptation
D.
evolution
Answer:
the answer is evolution the other person made me get it wrong
Explanation:
Individuals within populations exhibit some diversity. As a result of possessing slightly different traits, some individuals are better able to survive and reproduce than others. As these individuals are naturally selected, changes in the characteristics of the populations may occur over time. The cumulative change in these characteristics is known as evolution.
So, natural selection is the primary mechanism for evolution.
MARK ME BRAINLIEST.
YOUR WELCOME
Answer:
C
Explanation:
Evolution
Are all individuals in a population of animals or a population of plants identical
Answer:i’m not sure sorry
Explanation:
The table below shows properties of the element gold (Au).
Property Gold's
Characteristics
Color yellow
Density 19.32 g/mL
Electronegativity 2.54
Ionization Potential 9.225
Boiling Point 2807°C
Melting Point 1064.58°C
A physical property of gold is _______.
A.
density of 19.32 g/mL
B.
melting point of 1064.58°C
C.
boiling point of 2807°C
D.
all of these
Answer:
a) but also wouldn't the physical property of gold be malleable?
Explanation:
An object with a mass of 6.0 kg accelerates 4.0 m/s^2 when an unknown force is applied to it. What is the amount of the force?
Answer: 24 N
Explanation: solution attached:
F = ma
= 6.0 kg ( 4.0 m/s²)
= 24 N
In the mathematical equation showing that pressure (P) multiplied by volume (V) remains equal to a constant (k) pressure and volume are ___________ proportional
Answer:
Inversely
Explanation:
pV = k
When p increases, V must decrease for k to remain constant.
When V increases, p must decrease for k to remain constant.
When the product of two variables is a constant, they are inversely proportional to each other.
CH4 + O2 - CO2 + 2H2O
what is a polar functional group?
I think this is the answer
Final answer:
A polar functional group is a cluster of atoms within a molecule that has polar preferences due to the uneven distribution of electrons, resulting in areas with partial positive and negative charges which enable it to participate in various chemical reactions and interactions with other polar substances, such as water.
Explanation:
A polar functional group is a specific grouping of atoms within a molecule that has a polarized distribution of charges, which means there is an uneven distribution of electron density. This polarity arises because of the presence of electronegative atoms like oxygen, nitrogen, or fluorine, which attract electrons more strongly than other types of atoms in the functional group. These groups have partial positive and negative charges at different points and are often involved in chemical reactions due to their ability to interact with other molecules and ions. A classic example of a polar functional group is the hydroxyl group (-OH), common in alcohols and known for being hydrophilic or water-loving, meaning it can form hydrogen bonds with water and dissolve easily in it. Other examples include carbonyl groups (C=O) in ketones and aldehydes, carboxyl groups (-COOH) in amino acids and fatty acids, and phosphate groups (-PO4) often found in DNA and ATP.
What is the percent by mass of hydrogen in, C9H6O3
Hey there!
Molar mass of ( C₉H₆O₃ ) = 162.14 g/mol
atomic mass H = 1.007 amu
Therefore :
H% = atomic mass H / molar mass ( C₉H₆O₃ ) x 100
H % = ( 1.007 / 162.14 ) x 100 =
H% = 0.00621 x 100 =
H% = 0.621
Complete the paragraph about the formation of sodium phosphide.
Electrons are transferred from atoms of
and the phosphorus atoms
to atoms of
C. This transfer makes the sodium atoms
As a result, the sodium and phosphorus atoms strongly
each other.
Answer:
Electrons are transferred from atoms of (sodium) to atoms of phosphorous
The sodium atom (looses electrons) and the phosphorus atoms
(gains electrons) .
This transfer makes the sodium atoms acquire (positive) charge and phosphorous acquire (negative) charge .
As a result, the sodium and phosphorus atoms strongly (attract) with
each other.
Explanation:
In the paragraph about the formation of sodium phosphide: Electrons are transferred from atoms of sodium to atoms of phosphorous. This transfer makes the sodium atoms acquire positive charge and phosphorous acquire negative charge. As a result, the sodium and phosphorus atoms strongly attract each other.
Between the phosphorous (P) and sodium (Na) atoms, electron transfer occurs to generate sodium phosphide. When phosphorus receives electrons from sodium, sodium loses electrons, leaving sodium ions (Na⁺) with a positive charge and phosphide ions (P³⁻) with a negative charge as a result.
The oppositely charged ions are attracted to one another strongly electrostatically as a result of this charge difference. This kind of link, referred to as an ionic bond, results in the creation of sodium phosphide (Na₃P), a stable molecule in which several sodium ions are completely encircled by phosphide ions, solidly keeping them together in a crystal lattice structure.
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The probability of finding electrons in certain regions of an atom is described by?
orbits.
orbitals.
quanta.
photons.
Answer:
orbits
Explanation:
An orbital is a region of space where there is a high probability of finding an electron.
Which two elements in group 14 on the periodic table most likely to be malleable and good conductors of electricity
Answer:
Tin & Lead
Explanation:
They are metals and can conduct electricity because their outer electrons are not localized, i.e., they are not bound to specific atoms.
The energy level of electrons in the "conduction band" overlaps that of valence electrons. These electrons are more like a cloud dispersed throughout the piece of metal so that when an electric field is applied, they can move around.
The two element in 14th group of periodic table most likely to be malleable and good conductors of electricity are lead and tin. They are mostly existing in metallic state.
What are conductors ?Conductors are materials that can easily pass electricity through it at normal temperature. Metals are all good conductors. In addition metals have some peculiar features such as malleability, ductility, luster etc.
14th group elements are carbon family. In this group, carbon at normal temperature exists as gas. Silicon and germanium are semiconductors. Lead and tin are metallic in nature and they are malleable as well.
Lead and tin can be shaped and sized as desired and they are used in various electronic devices also because they are good conductors at metallic state. Therefore, tin and lead are the two elements.
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Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. CO + O2 → CO2
Answer:
2co + o2 > 2co2
Explanation:
so that is tye answer
Answer:
CO + O2 → CO2
To balance the equation, the atoms of elements on the left side must equal the atom of same element on the right side.
To balance the equation, put 2 in front of CO and 2 in front of CO2 as illustrated below:
2CO + O2 → 2CO2
The coefficients are 2, 1, 2
what mass in grams, of aluminum fins could 3088J of energy heat from 14.77 degrees C to 26.31 degrees C? Aluminum has a specific heat of 0.897/J (g degrees Celsius)?
Answer:
298.32 grams
Explanation:
Amount of energy required by known amount of a substance to raise its temperature by one degree is called specific heat capacity.
The equation used for this problem is as follow,
Q = m Cp ΔT ----- (1)
Where;
Q = Heat = 3088 J
m = mass = ??
Cp = Specific Heat Capacity = 0.897 J.g⁻¹.°C⁻¹
ΔT = Change in Temperature = 26.31 °C - 14.77 °C = 11.54 °C
Solving eq. 1 for m,
m = Q / Cp ΔT
Putting values,
m = 3088 J / (0.897 J.g⁻¹.°C⁻¹ × 11.54 °C)
m = 298.32 g
How to balance K2SO4+BaCl2= BaSO4+KCl
Answer:
The answer is K2SO4 + BaCl2 = BaSO4 + 2KCl
Explanation:
First, you can do it by looking how many chlorine is being used. As you can see that 2 chlorine is being used so you are sure that 2 chloine is in the right side.
Secondle, there are also 2 potassium in the left side so there must be also 2 potassium in the right side.
K2 + Cl2 = K2Cl2 (to make it beautiful)
= 2KCl (you can take out 2, just similar to factorisation)
(Hope this can help)
Final answer:
The balanced equation for the reaction between K2SO4 and BaCl2 to produce BaSO4 and KCl is K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2KCl(aq). BaSO4 is an insoluble precipitate, and the balance is achieved by having 2 moles of KCl in the products to match the potassium atoms.
Explanation:
To balance the chemical equation K2SO4(aq) + BaCl2(aq) → BaSO4(s) + KCl(aq), we need to ensure that the number of atoms of each element on the reactant side is equal to the number on the product side. Initially, we have 2 potassium (K) atoms on the reactant side and only 1 potassium atom on the product side. We also have 1 barium (Ba) atom, 1 sulfate (SO4) group, 2 chloride (Cl) atoms on the reactant side, and the same on the product side. To balance the equation, we simply need to adjust the coefficient in front of KCl to 2, as shown in the balanced equation:
K2SO4(aq) + BaCl2(aq) → BaSO4(s) + 2KCl(aq)
By doing this, we ensure that the number of potassium atoms is now 2 on both sides, and the chlorides are also balanced with 2 atoms on each side. The product BaSO4 is insoluble and will form a precipitate, while the other products remain in solution.
A photon detector captures a photon with an energy of 5.45 ✕ 10^−19 J. What is the wavelength, in nanometers, of the photon?
Answer:
364 nm
Explanation:
The formula for the energy (E) of a photon in terms of its wavelength λ is
E = hc/λ
We can rearrange this formula to give
λ = hc/E
If E = 5.45 × 10⁻¹⁹ J, then
[tex]\begin{array}{rcl}\lambda& = & \dfrac{6.626 \times 10^{-34} \text{ J$\cdot$s} \times 2.998 \times 10^{8}\text{ m$\cdot$ s}^{-1}} {5.45 \times 10^{19} \text{ J}}\\\\& = & 3.64 \times 10^{-7} \text{ m}\\& = & \textbf{364 nm}\\\end{array}\\[/tex]
How do energy transformations occur in a hydroelectric plant?
A.The kinetic energy of water is converted by a generator into electric energy.
B.The potential energy of water is converted by a transformer into electric energy.
C.The potential energy of water is converted to mechanical energy by a turbine.
D.The kinetic energy of water is converted by a dam into potential energy.
Next
Answer:
A.The kinetic energy of water is converted by a generator into electric energy.
Explanation:
Hydroelectric plant will need a source of flowing water. Water flow to lower ground because of gravity. The gravity will convert potential energy of water that located in higher ground into kinetic energy. These flowing water will be used to move the turbin that will in turn produce electrical energy.
So, the hydroelectric plant is converting the kinetic energy of water into electric energy.
Answer: A: The kinetic energy of water is converted be a generator into electric energy.
Explanation: I took the quiz!
The Calvin cycle converts ATP and NADPH to
a0
Answer:
The Calvin cycle converts ATP and NADPH to "convert CO2 to sugar".
Explanation:
When carbon dioxide reaches inside the leaf through pores called stomata in plants and spreads to the chloroplast stroma, it act as the location of Calvin cycle reactions where sugar is naturally produced.The light-independent processes are also called such reactions as they are not primarily guided by light.
The Calvin cycle processes can be separated into three main channels: carbon fixation, reduction, and starting molecule's regeneration as explained below:
Carbon Fixation: Six-carbon compound are generated in this step that bifurcate into two molecules (three-carbon compound) 3-phosphoglyceric acid (3-PGA), catalyzed by the enzyme rubisco or RuBP carboxylase/oxygenase.Reduction: In this phase of the cycle 3-PGA molecules are converted into glyceraldehyde-3-phosphate (G3P) i.e three-carbon sugar by using ATP and NADPH.Regeneration: Many G3P molecules are used to generate glucose, while others have to be recycled to recreate the acceptor RuBP.Many fuels, such as gasoline and diesel fuel, are hydrocarbons. Hydrocarbons are molecules that contain only hydrogen and carbon. Choose all of the criteria below that would make a hydrocarbon a good fuel in terms of enthalpy.
A Hydrocarbons burn to absorb a large amount of energy.
B Burning hydrocarbons produces a lot of energy.
C Breaking carbon-hydrogen and carbon-carbon bonds gives off energy.
D The enthalpy of combustion is a large negative value.
Answer:
Its B, C, and D.
Look at photo for proof.
A hydrocarbon would be a good fuel in terms of enthalpy if it produces a lot of energy when burned and has a large negative enthalpy of combustion. The correct option is (B).
Explanation:In terms of enthalpy, a good fuel would be one that releases a large amount of energy when burned. This means that burning hydrocarbons should produce a lot of energy (option B).
Breaking carbon-hydrogen and carbon-carbon bonds in hydrocarbons actually requires energy, so it doesn't contribute to the enthalpy of combustion (option C).
The enthalpy of combustion is defined as the heat released when one mole of a substance is burned completely in oxygen. Since the combustion of hydrocarbons releases a large amount of heat energy, the enthalpy of combustion is a large negative value (option D).
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what is the name of Fe(OH)3
Answer:Iron(|||) Hydroxide
Explanation:Fe is iron and OH is hydroxide
Final answer:
Iron(III) hydroxide is the name of the compound Fe[tex](OH)_{3}[/tex], a reddish-brown precipitate formed by iron in the +3 oxidation state combining with hydroxide ions.
Explanation:
The compound with the chemical formula Fe[tex](OH)_{3}[/tex] is known as iron(III) hydroxide. It can also be referred to as ferric hydroxide. This compound is formed when iron ions in the +3 oxidation state (Fe³⁺) combine with hydroxide ions (OH⁻) in a 1:3 ratio, resulting in the reddish-brown precipitate that is represented by the formula Fe[tex](OH)_{3}[/tex]. The chemical reactions provided, such as Fe(OH)₃ (s) + 3Na⁺ (aq) + 3NO₃⁻(aq), highlight the chemical processes involving iron(III) hydroxide in various contexts. In the case of FeCl₃(aq) + NaOH(aq), when a solution containing iron and a hydroxide is mixed, a precipitate of iron(III) hydroxide forms along with the resulting sodium chloride.
How many molecules of O2 will be formed from 34.35 grams of KClO3?
Answer:
8
Explanation:
The crust below the oceans is _____. thicker than the crust below the continents made of basalt and salt sediment made of sedimentary rock made of granite thinner than the crust below the continents
The crust below the ocean and ocean floor is thinner than the crust below the Earth's continents.
Answer:
it is filled with basalt
Explanation:
Watch It!
#3
After watching the examples
in the video of radiation, list 2
other examples that you
come up with on your own.
Answer:
ybvh8idXG)FYVn8jieowsdxcjv 8mis9kobh
Explanation:
the change in state from a solid to a liquid is called
Answer:
melting
Explanation:
Is a stick of dynamite potential energetic or kinetic
Answer:Potential Energy
Explanation:
It is because a stick dynamite is a stored energy which have to be acted upon(lighting it) for it to explode
Answer:
Potential Energy
Explanation:
Potential energy is stored energy, whereas kinetic energy is energy resulting from an object's motion. Considering the stick of dynamite has not been set off, and there is not motion, it has stored energy. Thus, it is potential energy.
Suppose the boy skipped his lunch for a day how will the hormones from his pancreasls help his body to cope wwhen his blood sugar level drops below normal
Answer:
The hormone glucagon secreted by the pancreatic cells cause the release of glucose from the body's storage.
Explanation:
The pancreas is an organ found inside the abdomen. This organ produces hormones such as:
InsulinGlucagonSomatostatinVasoactive intestinal peptideInsulin and glucagon are considered primary hormones secreted by the pancreas.
Upon skipping a meal, leading to a drop in blood sugar levels, glucagon is secreted by the pancreas. This hormone then acts on the liver to stimulate the conversion of stored up glycogen present in the liver into glucose. This produced glucose is then released into the blood stream, availing the boy glucose for energy.
The hormone of glucagon that is released by pancreas helps the body cope when the blood sugar level drops below normal.
Role of GlucagonThe hormones from his pancreas release glucagon that helps the body to cope when his blood sugar level drops below normal because the body needs energy so it takes the sugar from the storage present inside the body. If blood sugar level falls too low, the pancreas releases glucagon which tells the liver to make more glucose.
Glucagon is a hormone that is responsible for the making of glucose from the stored energy in the body so we can conclude that the hormone of glucagon that is released by pancreas helps the body cope when the blood sugar level drops below normal.
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