Answer:
%Cu = 66.4%
%S = 33.6%
Explanation:
Step 1: Given data
Mass of CuS: 9.56 gMass of Cu: 6.35 gStep 2: Calculate the mass of S
The mass of CuS is equal to the sum of the masses of Cu and S.
mCuS = mCu + mS
mS = mCuS - mCu
mS = 9.56 g - 6.35 g = 3.21 g
Step 3: Calculate the percent by mass of each element
We will use the following expression.
%Element = mElement / mCompound × 100%
%Cu = mCu / mCuS × 100% = 6.35 g / 9.56 g × 100% = 66.4%
%S = mS / mCuS × 100% = 3.21 g / 9.56 g × 100% = 33.6%
A gas is at 39.2c and 4.50L. What is the temperature (oC) when the gas is expanded to 10L?
Answer:
420.7 degrees C
Explanation:
Use the formula V1/T1 = V2/T2 (Charles' Law) to find T2. Make sure to convert your temperatures to Kelvin by adding 273 to the Celsius temperature.
V1 = 4.50 L
V2 = 10 L
T1 = 39.2 C = 312.2 K
Solve V1/T1 = V2/T2 for T2 and you get T2 = V2T1/V1
T2 = (10 L)(312.2 K) / (4.50 L) = 693.8 K
You can subtract 273 to get the temperature back to Celsius.
T2 = 693.8 - 273 = 420.7 degrees C
How many K3PO4 are in the equation below after it is correctly balanced?
K3PO4 +
HCI -->
KCI +
H3PO4
Answer:
1 K3PO4 +3 HCI -->3 KCI +1 H3PO4
Explanation:
K3PO4- 1
4. Describe a simple experiment that can be performed in the laboratory to demonstrate
the formation of iron (III) chloride from iron fillings.
Answer:
laboratory use the organic substances dissolve in water methanol or ethanol then Sinha to rise iron chloride solution is added a transient permanent coloration usually purple green or blue indicate the presence of a funnel or an hall
Balanced equation for Fe reacting with [tex]Cl_2[/tex]
[tex]2Fe + 3Cl_2[/tex] → [tex]2FeCl_3[/tex]
What are iron fillings?Iron filings are small shavings of ferromagnetic material.
When hydrochloric acid (HCl) reacts with iron filings (Fe) a dissolving metal reaction occurs with the Fe being converted to iron chloride ([tex]FeCl_2[/tex]) and hydrogen ([tex]H_2[/tex]).
The balanced equation is:
[tex]Fe + 2HCl[/tex] → [tex]FeCl_2 + H_2[/tex]
Note that reaction only produces [tex]FeCl_2[/tex] and not [tex]FeCl_3[/tex]. To make [tex]FeCl_3[/tex] you have to get more forcing and react Fe with chlorine gas ([tex]Cl_2[/tex]) at elevated temperature.
Since we are balancing equations here, below is the balanced equation for Fe reacting with [tex]Cl_2[/tex] (offered at no extra charge):
[tex]2Fe + 3Cl_2[/tex] → [tex]2FeCl_3[/tex]
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The volume of water in a graduated cylinder is 88 mL. After a small object is placed in the cylinder, the volume increases to 100 mL. What is the volume of the object? First give your answer in milliliters, then in cubic centimeters.
Answer:
12mL or 12 cubic centimeters.
Explanation:
The displacement of water is equal to the volume of the object.
100 mL - 88 mL = 12 mL
One milliliter is equal to one cubic centimeter.
A student performed a similar experiment we have done, with Ag and O to produce silver oxide.
Mass of crucible and lid: 29.307 g
Mass of crucible, lid, and silver: 30.958 g
Mass of crucible, lid, and silver oxide: 31.080 g
Use the above data to calculate the moles of the metal used in this experiment. your answer must include correct significant figures and unit.
Answer:
0.0153 mol
Explanation:
Mass of crucible and lid: 29.307 g
Mass of crucible, lid, and silver: 30.958 g
Number of moles = Mass /Molar mass
Mass of Silver = Mass of crucible, lid, and silver - Mass of crucible and lid
Mass of siilver = 30.958 g - 29.307 g
Mass of silver = 1.651 g
Molar mass of silver = 107.868 g/mol
Number of moles = 1.651 g / 107.868 g/mol
Number of moles = 0.0153 mol
7. Which substance produces sulfur dioxide when roasted in air?
A bauxite
B cryolite
C hematite
D zinc blende
B. cryolite substance produces sulfur dioxide when roasted in air.
Cryolite (Na3AlF6, sodium hexafluoroaluminate) is an uncommon mineral identified with the once-large deposit at Ivittuut on the west coast of Greenland, mined commercially until 1987.
Sulfur dioxide (SO2) is a gaseous air pollutant composed of sulfur and oxygen. SO2 forms when sulfur-containing fuel such as coal, oil, or diesel is burned. Sulfur dioxide also converts in the atmosphere to sulfates, a major part of fine particle pollution in the eastern U.S.
What is sulfur dioxide and why is it bad?Sulfur dioxide (SO2), a colorless, bad-smelling, toxic gas, is part of a larger group of chemicals referred to as sulfur oxides (SOx). These gases, especially SO2, are emitted by the burning of fossil fuels — coal, oil, and diesel — or other materials that contain sulfur.
What is sulfur dioxide used for?Although its chief uses are in the preparation of sulfuric acid, sulfur trioxide, and sulfites, sulfur dioxide also is used as a disinfectant, a refrigerant, a reducing agent, a bleach, and a food preservative, especially in dried fruits.
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Which sentences describe decomposers in a food chain?
They are the final link in the energy flow in a food chain or a food web. They are fungi and animals that feed on dead organic matter. Plants
produce food or energy from raw materials. Plants are also known as autotrophs because they can produce organic compounds from inorganic
chemicals. Bacteria, fungi, worms, and snails recycle the garbage of dead matter and give back nutrients into the ecosystem.
Answer:
hey are the final link in the energy flow in a food chain or a food web. They are fungi and animals that feed on dead organic mattet.
Explanaticuz im naruto uzamaki
5. Kinetic energy can:
A. become potential energy during a collision
B. decrease during a collision
C. increase during a collision
D. be transferred between objects during a collision
4 NH3 +5 02 +4NO + 6H2O
When 70.25 grams of NH3 react, how many moles of H20 are produced?
Answer:
6.19 mol H₂O
Explanation:
4 NH₃ + 5O₂ → 4NO + 6H₂OFirst, we convert 70.25 grams of NH₃ into moles, using its molar mass:
70.25 g ÷ 17 g/mol = 4.13 mol NH₃Then we convert 4.13 moles of NH₃ into moles of H₂O, using the stoichiometric coefficients of the balanced reaction:
4.13 mol NH₃ * [tex]\frac{6molH_2O}{4molNH_3}[/tex] = 6.19 mol H₂OFill in the blanks to complete each statement about the heating of Earth's surface
Earth takes in thermal energy from the Sun in a process called blank.
Sunlight strikes Earth's surface at different angles. This angle is called the angle of blank
Answer: Absorption and insolation
Explanation:
Answer:
what the person above said
STEP 5: LEAD
Tare the balance. Put calorimeter (no lid) on the balance.
Measure the mass to the nearest 0.01 g.
12.34 g
Use a graduated cylinder to add approximately 40 mL of
water to the calorimeter. Measure the mass of the
calorimeter (no lid) and water to the nearest 0.01 g.
51.99 g
Subtract to find the mass of the water. 39.65 g
Answer:
the answers are in the pic
Explanation:
Answer:
12.36, 52.49, 40.13
Explanation:
Step 5 for the copper one
most bones are connected at Joints by
Answer:
Los huesos se mantienen unidos a otros huesos a través de unas largas tiras fibrosas llamadas ligamentos. El cartílago, una sustancia flexible y elástica que contienen las articulaciones, sujeta los huesos y los protege en los puntos donde varios huesos friccionan entre sí.
A balloon has a volume of 105 Lif the temperature is 20 °C. If the temperature is -55°C,
what will be the volume of the volume?
Answer:
78.12 L
Explanation:
Given that,
Initial volume, V₁ = 105 L
Initial temperature, T₁ = 20°C = 20+273 = 293 K
New temperature, T₂ = -55 °C = 218 K
We need to find the new volume of the balloon. The relation between the volume and the temperature is given by :
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Where
V₂ is the new volume
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{105\times 218}{293}\\\\V_2=78.12\ L[/tex]
So, the new volume is 78.12 L.
3- Write the chemical formula of Alanine and find to which food category it belongs.
Answer:
C3H7NO2
Explanation:
The chemical formula of Alanine is C3H7NO2 and it belongs to almost all food category because it is present in one food of each food category such as dairy products, meat, nuts, soy, and whole grains etc. Alanine is a nonessential amino acid means that it does not directly obtained from the diet but it can be produced by the body using raw materials present in the food.
102.5 MHz (typical frequency for FM radio broadcasting) in joules
Answer:
6.80×10¯²⁶ J
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 102.5 MHz
Energy (E) =?
Next, we shall convert 102.5 MHz to Hz. This can be obtained as follow:
1 MHz = 10⁶ Hz
Therefore,
102.5 MHz = 102.5 MHz × 10⁶ Hz / 1 MHz
102.5 MHz = 1.025×10⁸ Hz
Finally, we shall determine the energy. This can be obtained as follow:
Frequency (f) = 1.025×10⁸ Hz
Planck's constant (h) = 6.63×10¯³⁴ Js
Energy (E) =?
E = hf
E = 1.025×10⁸ × 6.63×10¯³⁴
E = 6.80×10¯²⁶ J
hen CO(g) reacts with O2(g) to form CO2(g) , 283 kJ of energy are evolved for each mole of CO(g) that reacts. Write a balanced thermochemical equation for the reaction with an energy term in kJ as part of the equation. Note that the answer box for the energy term is case sensitive. Use the SMALLEST INTEGER coefficients possible and put the energy term (including the units) in the last box on the appropriate side of the equation. If a box is not needed, leave it blank.
Answer:
2CO + O2 =====> 2CO2 ΔH = -566 KJ
Explanation:
A thermochemical equation is a chemical equation that includes the enthalpy change of the reaction (Lumen Learning).
In a thermochemical equation, we can easily see the heat of reaction written after the symbols of reactants and products. It tells us whether heat was evolved or gained in the chemical process. When heat is gained ΔH = positive. When heat is evolved, ΔH = negative.
The thermochemical equation for the reaction of CO and O2 is shown below;
2CO(g) + O2(g) =====> 2CO2 (g) ΔH = -566 KJ
As the earth heats up, the atmosphere is warmed by this longer-wave energy
Answer:
Hello
Once in the Earth's atmosphere, clouds and the surface absorb the solar energy. The ground heats up and re-emits energy as longwave radiation in the form of infrared rays.
Explanation:
thanks
As the earth heats up, the atmosphere is warmed by long-wave infrared radiation. Thermal energy is released by the earth.
What is the atmosphere?An atmosphere surrounding the earth and the place where all living and non-living things live together. The atmosphere keeps all objects safe and cover-up, and it also gives a covering from the outer rays and gases that can be harmful to biotic and abiotic factors.
The sun's rays come to the earth and increase the temperature of the earth, these rays reflect back to the atmosphere but are trapped, and this increase the warmth of the earth.
These rays are long wave infrared radiation and thermal energy is the energy that is heat energy and produces warmth
Thus, the atmosphere is warmed by long-wave infrared radiation.
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The total pressure in a container is 37.9 psi. There are two gases in the container. Gas A exerts a pressure of 18.4 psi. What is the pressure of gas B?
Answer:
19.5
Explanation: using dalton law pt=p1+p2+p3...
the total pressure is 37.9 so to get pressure of gas b subtract pressure of gas a from total pressure.37.9-18.4 gas b equals 19.5
How many moles of Cu are in 1.48 × 1025 Cu atoms?
24.6 mol Cu
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.48 × 10²⁵ atoms Cu
[Solve] moles Cu
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.48 \cdot 10^{25} \ atoms \ Cu(\frac{1 \ mol \ Cu}{6.022 \cdot 10^{23} \ atoms \ Cu})[/tex][DA] Divide [Cancel out units]: [tex]\displaystyle 24.5766 \ mol \ Cu[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
24.5766 mol Cu ≈ 24.6 mol Cu
What does efficient mean in your own words
Answer:
llo
Explanation:
efficent: well orgainzed, completed with mimumin amount of effort
capable is the correct answer accept it surely
Fill in the blanks.
The regioselectivity of a reaction is often based on the energetics of the reaction. The kinetic product of a reaction is the product with the ____________.
The kinetic product is favored when the temperature is ________.
The thermodynamic product of a reaction is the product with the ____________.
The kinetic product is favored when the temperature is ___________.
Answer:
vcfg
Explanation:
The kinetic product of a reaction is the product with the high energy and favored when the temperature is low. The thermodynamic product of a reaction is the product with the low energy and favored when the temperature is high.
What is regioselectivity?Regioselectivity is that part of any chemical reaction where if product is formed by more than one ways than only one way will be prefererd in this condition.
In any system if chemical reaction is occur at low temperature then the fast formed product is the stable product which is kinetically favored, and have the high energy.In any system if chemical reaction is occur at high temperature then the slow formed product is the stable product which is thermodynamically favored, and have the low energy.Hence correct options are high energy, low, low energy and high.
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During the intrusion of the Palisades Sill, contact metamorphism changed sandstone and shale into?
a) diorite
b) marble
c) limestone
d) hornfels
Answer:
i believe it's c but I'm not one hundred percent sure
Explanation:
An earthquake creates a type of wave that shakes the ground. If a large earthquake occurs in Greece, how can the waves be felt across the sea in Italy?
A.
Waves can be transformed into strong winds that travel across the sea.
B.
Waves do not travel through water, but they can crash the sea into land far away.
C.
Waves can cause a series of earthquakes around the world.
D.
Waves can travel through different media including solid land and water.
A chlorine concentration of 0.500 ppm is desired for water purification. What
mass of chlorine must be added to 2500 L of water to achieve this level?
Answer:
1.25 grams of chlorine.
Explanation:
Hello there!
In this case, since it is possible to define the parts per million of chlorine as the milligrams of chlorine per liters of water, in order to obtain the mass of chlorine in 2500 L, we proceed as follows:
[tex]ppm=\frac{mg}{L}\\\\mg=ppm*L[/tex]
In such a way, we plug in the given 0.500 ppm and 2500 L to obtain (in grams):
[tex]mg=0.500mg/L*2500L\\\\g=1250mg*\frac{1g}{1000mg}\\\\ g=1.25g[/tex]
Best regards!
Which the following classes of compound is an example of acarbonyl compound
Answer:
b) carboxylic acid
Explanation:
A solution is prepared by dissolving 27.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of CaCl2 is ________% by mass. A solution is prepared by dissolving 27.7 g of CaCl2 in 375 g of water. The density of the resulting solution is 1.05 g/mL. The concentration of CaCl2 is ________% by mass. 6.24 6.88 7.22 0.0722 0.0688
Answer:
6.88%
Explanation:
Step 1: Given data
Mass of CaCl₂ (solute): 27.7 gMass of water (solvent): 375 gStep 2: Calculate the mass of the solution
The mass of the solution is equal to the sum of the masses of the solute and the solvent.
mSolution = mSolute + mSolvent
mSolution = 27.7 g + 375 g = 402.7 g
Step 3: Calculate the percentage by mass of CaCl₂
We will use the following expression.
%m/m = mass CaCl₂/mass Solution × 100%
%m/m = 27.7 g/402.7 g × 100% = 6.88%
Why is ocean water near the equator warmer than ocean water at the poles?
O A. The sun's rays strike the water more directly near the equator.
O B. Deep sea vents pump steam into the conveyor belt near the
equator.
O C. The water is denser and saltier near the equator, so it holds more
heat.
D. Due to Earth's rotation, gyres near the equator flow clockwise.
SUBM
2. What process of chemical weathering can create rust?
Answer:
Oxidation
Explanation:
How many mL of 0.25 M NaOH would have 0.18 moles of NaOH?
Answer:
720 mL
Explanation:
To answer this problem we'll use the definition of molarity:
Molarity = moles / litersWith that in mind we can calculate the volume in liters:
0.25 M = 0.18 moles / litersliters = 0.72 LFinally we convert liters to mL:
0.72 L * 1000 = 720 mLThus 720 mL of 0.25 M NaOH would have 0.18 moles of NaOH.
Which of the following solutions is acidic?
A. pH 7
B. pH 5
C. pH 14
D. pH 10
need answer quick
