Answer:
Atoms have protons and neutrons in the center, making the nucleus, while the electrons orbit the nucleus. The modern atomic theory states that atoms of one element has its own characteristics atomic number.
Civic participation is best described as the act of
avoiding harming other community members.
meeting one's legal responsibilities.
voting in every type of election.
going above and beyond one's legal duties.
Which is one of Edwin Hubble’s findings that supports the big bang theory?
Answer:
meeting ones legal responsibility
How much energy (in J) is lost when a sample of iron with a mass of 28.3 g cools from 66.0 degrees celsius to 24.0 degrees celsius.
Answer:
Q = -535 J.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to calculate the lost energy according to the following and generic heat equation:
[tex]Q=mC(T_F-T_i)[/tex]
Thus, since the specific heat of iron is 0.450 in the SI units, we can plug in the mass and temperatures to obtain:
[tex]Q=28.3g*0.450\frac{J}{g\°C} (24.0\°C-66.0\°C)\\\\Q=-535J[/tex]
Regards
2. How many calories are needed to raise 50 g of iron from 55°C to 200°C? (c = 0.110 cal/g °C)
Answer:
Q = 797.5 cal
Explanation:
Given that,
Mass of iron, m = 50 g
The temperature rises from 55°C to 200°C.
We need to find the heat needed to raise the temperature. The heat raised is given by :
[tex]Q=mc\Delta T[/tex]
Put all the values,
[tex]Q=50\times 0.11\times (200-55)\\\\Q=797.5\ cal[/tex]
So, 797.5 calories of heat is needed.
Solid lead acetate is slowly added to 75.0 mL of a 0.0492 M sodium sulfate solution. What is the concentration of lead ion required to just initiate precipitation?
Answer:
The concentration of lead ion required to just initiate precipitation is -[tex]2.37\times10^-^5 M[/tex]
Explanation:
Lets calculate -:
Solubility equilibrium -: [tex]PbI_2(s)[/tex] ⇄ [tex]Pb^2^+ (aq) + 2I^- (aq)[/tex]
Solubility product of [tex]PbI_2[/tex] ,[tex]Q=[Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex][I^-]^2_i_n_i_t_i_a_l[/tex] [tex]=9.8\times10^-^9[/tex]
Concentration of [tex]I^-[/tex][tex]=[KI]=0.0492M[/tex]
When the ionic product exceeds the solubility product , precipitation of salt takes place .
[tex]Q_s_p\geq K_s_p[/tex]
[tex][Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex][I^-]^2_i_n_i_t_i_a_l[/tex] [tex]\geq 9.8\times10^-^9[/tex]
[tex][Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex][0.0492]^2[/tex] [tex]\geq 9.8\times10^-^9[/tex]
[tex][Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex]\geq \frac{9.8\times10^-^9}{[0.0492]^2}[/tex]
[tex][Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex]\geq[/tex] [tex]\frac{9.8\times10^-^9}{2.42\times10^-^3}[/tex]
[tex][Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex]\geq[/tex] [tex]2.37\times10^-^5 M[/tex]
Thus , [tex]PbI_2[/tex] will start precipitating when [tex][Pb^2^+]_i_n_i_t_i_a_l[/tex] [tex]\geq 2.37\times10^-^5 M[/tex].
What is the mass of a sample of NH3 containing 7.20 x 1024 molecules of NH3? (5 points) Group of answer choices 203 grams 161 grams 214 grams 187 grams
Answer:
203 grams
Explanation:
The no. of moles of (6.3 x 10²⁴ molecules--Avagadros number) of NH₃ = (1.0 mol)(7.2 x 10²⁴ molecules)/(6.022 x 10²³ molecules) = 11.96 mol.
The no. of grams of NH₃ present = no. of moles x molar mass = (11.96 mol)(17.0 g/mol) = 203.3 g ≅ 203.0 g.
The answer is the mass of a sample of NH3 containing 7.20 x 1024 molecules of NH3 is 203 grams.
What is a molecule ?A molecule is a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.
6.02214076 × 10²³ molecules constitutes 1 mole of NH₃
7.20 x 10²⁴ molecules constitutes of
[tex]\rm\dfrac{7.20 \times 10^{24}}{6.02\times 10^{23}}\\[/tex]
=11.19 moles
1 mole of NH₃ = 17 gm
11.19 mole will be = 17 * 11.19
= 203 grams
Therefore the mass of a sample of NH3 containing 7.20 x 1024 molecules of NH3 is 203 grams.
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The celestial bodies in space move about in predictable paths called blank . As a result, a planet is able to blank around the Sun. Other objects in the solar system also orbit the Sun. These objects include blank and comets.
Answer:
Gravity
Explanation:
All matter exerts a force, which is called , that pulls all other matter towards its center. The strength of the force depends on the mass of the object: the Sun has more gravity than Earth, which in turn has more gravity than an apple. Also, the force weakens with distance. Objects far from the Sun won’t be influenced by its gravity.
A hot metal plate at 150°C has been placed in air at room temperature. Which event would most likely take place over the next few minutes?
-Molecules in both the metal and the surrounding air will start moving at lower speeds. -Molecules in both the metal and the surrounding air will start moving at higher speeds. -The air molecules that are surrounding the metal will slow down, and the molecules in the metal will speed up.
-The air molecules that are surrounding the metal will speed up, and the molecules in the metal will slow down.
Answer:
until the next harvest, and seed must be held for the next season's ... successful grain storage is the moisture content of the crop. ... or both. If ambient temperatures are low, then air alone may cool the ... allow some of the drying to take place naturally while the crop ... employed to cool grain that has been placed in storage.
a sample of mg(hco3)2 contains 1.8 moles of oxygen atom find the number of carbon atoms in the given sample
please solve fast very much urgent
Answer:
0.60 moles of atoms of carbon
Explanation:
Step 1: Given data
Chemical formula of the compound: Mg(HCO₃)₂Moles of oxygen atoms: 1.8 molesStep 2: Calculate the number of carbon atoms in the given sample
According to the chemical formula of the compound, the molar ratio of C to O is 2:6, that is, there are 2 moles of atoms of C every 6 moles of atoms of O. The number of moles of atoms of C is:
1.8 mol O × 2 mol C / 6 mol O = 0.60 mol C
What is matter?
O A. Anything that has energy and motion
B. Anything that takes up space and has mass
C. Anything that can be seen
D. Anything that can be measured
Answer:
B.Anything that takes up space and has mass
Zack has noticed a lot of changes in his body. He has gained muscle mass and started to grow facial hair. His voice is also getting deeper.
In which stage of development is he?
childhood
adolescence
early adulthood
late adulthood
Answer:
b
Explanation:
Someone please help anyone who steals points will be reported
Answer:
ecosystem i think
What element in group 1 is not considered an alkali metal?
A. Hydrogen (H)
B. Lithium (Li)
C. Potassium (K)
D. Cesium (Cs)
Answer:
A
Explanation:
Hydrogen isn't an alkali metal
Answer:
hydrogen
Explanation:
hydrogen is a gas not a metal
In each pair of compounds, pick the one with the higher vapor pressure at a given temperature. Explain your reasoning.
a. CH4 or CH3CI
b. CH3CH2CH2OH or CH3OH
c. CH3OH or H2CO
Answer:
The answer is:
[tex]PART \ A: CH_4\\\\PART \ B: CH_30H\\\\PART \ C: H_2CO[/tex]
Explanation:
Parts A:
The vapor pressure is higher in [tex]CH_4[/tex] because it is non-polar, while [tex]CH_3Cl[/tex] is polar. [tex]CH_4[/tex] has a lower molar weight as well.
Part B:
Although hydrogen bonding is found in both commodities, the vapor pressure is higher because of the smaller molar mass of [tex]CH_30H[/tex].
Part C:
[tex]H_2CO[/tex] does not show hydrogen due to the increased vapor pressure
[tex]CH_3OH[/tex] bonding.
A gas mixture contains each of the following gases at the indicated partial pressures: N2, 231 torr ; O2, 101 torr; and He, 155 torr .
What is the total pressure of the mixture?
What mass of each gas is present in a 1.00 -L sample of this mixture at 25.0 degrees Celsius?
Enter your answers numerically separated by commas.
Answer:
P = 487 Torr
mN₂ = 0.347 g
mO₂ = 0.174 g
mHe = 0.0333 g
Explanation:
Step 1: Calculate the total pressure of the mixture
The total pressure of the mixture (P) is equal to the sum of the partial pressures of the gases.
P = pN₂ + pO₂ + pHe
P = 231 Torr + 101 Torr + 155 Torr = 487 Torr
Step 2: Calculate the moles of each gas
We have 3 gases in a 1.00 L container at 25.0 °C (298.2 K). We can calculate the number of moles using the ideal gas equation: P × V = n × R × T.
nN₂ = pN₂ × V / R × T
nN₂ = 231 Torr × 1.00 L / (62.4 Torr.L/mol.K) × 298.2 K = 0.0124 mol
nO₂ = pO₂ × V / R × T
nO₂ = 101 Torr × 1.00 L / (62.4 Torr.L/mol.K) × 298.2 K = 0.00543 mol
nHe = pHe × V / R × T
nHe = 155 Torr × 1.00 L / (62.4 Torr.L/mol.K) × 298.2 K = 0.00833 mol
Step 3: Calculate the mass of each gas
The molar mass of N₂ is 28.01 g/mol.
mN₂ = 0.0124 mol × 28.01 g/mol = 0.347 g
The molar mass of O₂ is 32.00 g/mol.
mO₂ = 0.00543 mol × 32.00 g/mol = 0.174 g
The molar mass of He is 4.00 g/mol.
mHe = 0.00833 mol × 4.00 g/mol = 0.0333 g
Calculate the mass of sucrose needed to prepare a 2000 grams of 2.5% sucrose solution.
Answer:
50 g Sucrose
Explanation:
Step 1: Given data
Mass of solution: 2000 gConcentration of the solution: 2.5%Step 2: Calculate the mass of sucrose needed to prepare the solution
The concentration of the solution is 2.5%, that is, there are 2.5 g of sucrose (solute) every 100 g of solution. The mass of sucrose needed to prepare 2000 g of solution is:
2000 g Solution × 2.5 g Sucrose/100 g Solution = 50 g Sucrose
How much energy is contained in the six-cookie serving size recommended on the label?
Monounsaturated Fat 1g
The elements in the periodic table are not always represented by
the first one or two letters in their names. What are some examples of
this (list three)?
Unnillium (101)
Unnilbium (102)
Unniltrium (103)
Unnilquadium (104)
Unnilpentium (105)
Unnilhexium (106)
Unnilseptium (107)
Unniloctium (108)
Unnilennium (109)
Ununnillium (110)
A blacksmith is in the process of making iron horse shoes. Each shoe, mass of 255.15g, is heated to a bright red (816c), hammered into shape, and then dropped into water to cool. If the bucket contains 4L of water (4000g) initially at room temperature (23c) what will the final temperature of the iron be? Specific heat of cast iron: 0.461 J/gC. Specific heat of water: 4.18 J/gC
Answer:
Explain
The Akautski is now assembled
The final temperature of the system can be calculated using calorimetric equation. The heat gained by water is equal to the heat lost by iron. Hence, the final temperature is 28 °C.
What is calorimetry ?Calorimetry is an analytical tool used to determine the heat energy absorbed or released by a system. The calorimetric equation connecting the heat energy q with mass m, specific heat capacity c and temperature difference ΔT is given as:
q = m c ΔT
Here, the heat lost by iron = heat gained by water
m of iron = 255.15 g
initial temperature = 816 °C
c = 0.461 J/°C g.
Mass of water = 4000 g
c = 4.18 J/°C g
initial temperature = 23 °C
Let T be the final temperature of the system.
then,
0.461 J/°C g × 255.15 g × (816 - T) = 4.18J/°C g × 4000 g × (T - 23)
117.62 J(816 - T) = 16720 (T - 23)
T = 28°C.
Therefore, the final temperature of the system will be 28°C.
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A or B or C or D, fassst plzzz
Answer:
a.option is the correct answer
The equilibrium constant, Kp, for the following reaction is 0.636 at 600K.
COCl2(g) <=> CO(g) + Cl2(g)
If an equilibrium mixture of the three gases in a 16.9 L container at 600K contains COCl2 at a pressure of 0.836 atm and CO at a pressure of 0.551 atm, the equilibrium partial pressure of Cl2 is ............ atm.
Answer: The equilibrium partial pressure of [tex]Cl_{2}[/tex] is 0.964 atm.
Explanation:
Given: [tex]K_{p} = 0.636[/tex]
[tex]P_{COCl_{2}} = 0.836 atm[/tex]
[tex]P_{CO} = 0.551 atm[/tex]
The given reaction equation is as follows.
[tex]COCl_{2}(g) \rightleftharpoons CO(g) + Cl_{2}(g)[/tex]
Formula used to calculate the partial pressure of [tex]Cl_{2}[/tex] is as follows.
[tex]K_{p} = \frac{P_{CO} \times P_{Cl_{2}}}{P_{COCl_{2}}}[/tex]
Substitute the values into above formula as follows.
[tex]K_{p} = \frac{P_{CO} \times P_{Cl_{2}}}{P_{COCl_{2}}}\\0.636 = \frac{0.551 atm \times P_{Cl_{2}}}{0.836 atm}\\P_{Cl_{2}} = 0.964 atm[/tex]
Thus, we can conclude that the equilibrium partial pressure of [tex]Cl_{2}[/tex] is 0.964 atm.
Which of the following is the BEST description of a budget? *
10
Answer:
A budget is an estimation of revenue and expenses over a specified future period of time and is usually compiled and re-evaluated on a periodic basis. Budgets can be made for a person, a group of people, a business, a government, or just about anything else that makes and spends money.
In volcanic areas, groundwater heated by magma is a source of
a.
lava flows.
b.
silica.
c.
geothermal energy.
d.
pyroclastic flows.
Answer:I believe it is c.
Explanation:
Answer:
C., or "geothermal energy."
According to Wegener, if the continents moved in the past, what did Earth look like during Pangaea?
a very small landmass where only two continents were connected
a giant landmass where only two continents were connected
a very small landmass where all the continents were connected
a giant landmass where all the continents were connected
Answer:
Continental drift describes one of the earliest ways geologists thought continents moved over time. Today, the theory of continental drift has been replaced by the science of plate tectonics.
Explanation:
Answer:
a giant landmass where all the continents were connected
Explanation:
Pangea was C-shaped, with the bulk of its mass stretching between Earth's northern and southern polar regions. The curve of the eastern edge of the supercontinent contained an embayment called the Tethys Sea, or Tethys Ocean. The Paleo-Tethys Ocean took shape during Pangea's initial assembly phase.
Give an example to illustrate the difference between "paying more in taxes ” and paying a higher tax rate .
The line notation, Pt
| H2(g) | H (aq) || Cu2 (aq) | Cu(s),
indicates that
copper metal is a product of the cell reaction.
hydrogen gas (H2) is a product of the cell reaction.
Cu is the anode.
Pt is the cathode.
Answer:
copper metal is a product of the cell reaction.
Explanation:
In writing the line notation of a cell reaction, we ought to recall that the anode is placed at the left hand side of the notation while the cathode is placed at the right hand side of the notation.
If we look at the line notation shown in the question, we will realize that the Cu2+ (aq) | Cu(s) half cell is the cathode and that copper metal is the product of the reaction as shown by the notation.
What does a velocity measurement include that a speed measurement does not?
time
direction
distance
acceleration
if you wanted to create 500g of calcium carbonate how much calcium chloride and sodium carbonate would you need?I need help please anyone. It's using stiochonometry and limiting reagent both or either one I don't know. But please help me
Mass of Calcium Carbonate = 500 grams
The required reaction would be:
CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl
Number of moles of CaCO₃:
Number of moles = given mass / molar mass
Number of moles = 500 / 100 [molar mass of CaCO₃ = 100g/mol]
Number of moles = 5 moles
Using the power of stoichiometry!!!
CaCl₂ + Na₂CO₃ → CaCO₃ + 2NaCl
from the balanced reaction listed above, we can see that one mole of CaCl₂ and one mole of Na₂CO₃ produces one mole of CaCO₃
Moles of CaCl₂ = Moles of Na₂CO₃ = Moles of CaCO₃
we just solved for the number of moles of CaCO₃, which gives us
Moles of CaCl₂ = Moles of Na₂CO₃ = 5 moles
Hence, 5 moles of CaCl₂ and Na₂CO₃ each is required
Question 6
4 pts
6) Chromium crystallizes in a body-centered cubic unit cell. If the length of an edge of the unit cell
is 289 pm, what is the density (in g/cm3) of chromium?
Show your work on a paper and upload it here.
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Answer:
7.15g/cm³
Explanation:
To solve this question we must know that a body-centered cubic unit cell contains 2 atoms.
The volume of the unit cell is:
289pm = (289x10⁻¹²m)³ =
2.414x10⁻²⁹m³ * (1cm³ / 1x10⁻⁶m³) = 2.414x10⁻²³cm³
And the mass is -Molar mass Chromium = 51.9961g/mol:
2atoms * (1mol / 6.022x10²³atoms) * (51.9961g / mol) =
1.727x10⁻²²g
The density is:
1.727x10⁻²²g / 2.414x10⁻²³cm³ =
7.15g/cm³If a medicine ball in a gym has a mass of 4.0 Kg, what is its weight?
Answer:
Weight = 0.4Explanation:
Given Information :
Mass = 4.0kg
Acceleration due to gravity = 10 m/s
Weight= ?
[tex]Weight = \frac{mass}{acceleration\: due \:to \:gravity} \\\\W= \frac{4.0}{10} \\\\W= \frac{2}{5} \\\\W=0.4[/tex]
A pure substance is:___.
a. composed of two or more different types of atoms or molecules combined in variable proportions.
b. composed of two or more regions with different compositions.
c. composed of only one type of atom or molecule.
d. composed of two or more different types of atoms or molecules that has constant composition.
e. none of the above.
Answer:
c. composed of only one type of atom or molecule.
Explanation:
Pure substances are the substances that could be made up of only one type of particles and also it contains fixed structure. They would be further categorized as the elements & compounds. It is an elements that only consist of only one type of atom or molecule
Therefore as per the given situation, the option c is the answer
Answer: correct answer is C
Explanation: