An example of radiation is a car that gets hot when parked in the sun, as it involves the transfer of heat via infrared waves emitted by the sun. Heat transfer by radiation does not require a medium and is significantly influenced by the emitting object's surface area and temperature. Hence, option A is correct.
Examples of radiation involve the transfer of heat energy without the need for a medium, such as air, to facilitate the transfer. It occurs through electromagnetic waves, and an example of this is when your car parked in the sun is hot when you return. The sun emits infrared waves that transfer heat to the car's surfaces, warming them even without direct contact. Other forms of heat transfer, like convection and conduction, necessitate the movement of air or physical contact, respectively.
Electromagnetic radiation can come in various forms, including microwaves, infrared radiation, and visible light. The Earth is warmed by the sun through radiation, and even the human body emits thermal radiation. Understanding heat transfer by radiation is essential in many applications, from household heating to climate science. The power of radiation is significantly influenced by the emitting object's surface area and is dramatically affected by its absolute temperature (as per the relationship P × T⁴).
Given the following equation: 2 Ca + O2 --> 2 CaO How many moles CaO produced from 4 moles O2?
8 moles of CaO produced from 4 moles O2.
Explanation:
Balanced chemical equation for the reaction:
2 Ca + O2 --> 2 CaO
Data given:
moles of O2 = 4
Moles of CaO =?
From the reaction it is seen that 1 mole of O2 is used in the reaction to produce 2 moles of CaO
hence, 4 moles of O2 will give x moles of CaO
[tex]\frac{2}{1}[/tex] = [tex]\frac{x}{4}[/tex]
x =8
So, 8 moles of CaO will be produced when 4 moles of O2 will be used in the reaction. Since oxygen is the limiting reagent in the reaction.
Classify the following bonds as ionic, polar
covalent, or nonpolar covalent, and explain:
(a) the CaO bond in CaO, (b) the CC bond in C13CCC13,
(c) the CCl bond in C13CCC13,
(d) the SeCl bond
in SeCl2.
Final answer:
The CaO bond in CaO is ionic, the CC bond in C13CCC13 is nonpolar covalent, the CCl bond in C13CCC13 is polar covalent, and the SeCl bond in SeCl2 is polar covalent.
Explanation:
The classification of bonds as ionic, polar covalent, or nonpolar covalent is based on the electronegativity difference between the bonded atoms. The greater the electronegativity difference, the more ionic the bond is.
(a) The CaO bond in CaO is an ionic bond. Calcium (Ca) is a metal and has a low electronegativity, while oxygen (O) is a nonmetal with a high electronegativity. The difference in electronegativity is large, resulting in an ionic bond.
(b) The CC bond in C13CCC13 is a nonpolar covalent bond. Both carbon (C) atoms have the same electronegativity, resulting in a nonpolar bond.
(c) The CCl bond in C13CCC13 is a polar covalent bond. Chlorine (Cl) has a higher electronegativity than carbon (C), resulting in a polar bond.
(d) The SeCl bond in SeCl2 is a polar covalent bond. Selenium (Se) and chlorine (Cl) have different electronegativities, resulting in a polar bond.
The solubility constant of MnS is 2.3 ×10−13 at 25°C. What is the concentration of sulfide
ions in a saturated solution of MnS at equilibrium?
[A] + [B] ⇌ [C] + [D]
MnS ⇌ Mg + S
Ksp = [C][D]
Ksp = (Mn)(S)
2.3*10^-13 = (x)(x)
2.3*10^-13 = x^2
x = 4.8*10^-7
Concentration of sulfide is x.
Today, my son asked "Can I have a book, Mark?" and I burst into tears. 11 years old and he still doesn't know my name is Brian.
How many grams of Ag will be produced from 5.00g of Cu and 1.00g of AgNO3
Answer:
0.635 grams
Explanation:
Equation for the reaction
[tex]Cu + 2 AgNO_3 -----> Ag^{2+} + CuNO_3[/tex]
mass of Cu = 5.00 g
molar mass = 63.5 g/mol
number of moles = [tex]\frac{mass}{molar mss}[/tex]
number of moles of Cu = [tex]\frac{5.00g}{63.5g/mol}[/tex]
number of moles of Cu = 0.0787 moles
To determine the moles of Ag formed; we have:
0.00588 moles of AgNO₃ × [tex]\frac{2 moles of Ag}{2 moles of AgNO_3}[/tex]
= 0.00588 moles of Ag are produced
Molar mass of Ag = 108 g/mol
Then mass of Ag that will be produced = number of moles of Ag × molar mass of Ag
= 0.00588 moles × 108 g/mol
= 0.635 grams of Ag are produced.
Answer:
0.635 g of Ag
Explanation:
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Is potassium a metal, non metal or metalliod
Answer: Metal
Explanation: Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart. Potassium is silvery when first cut but it oxidizes rapidly in air and tarnishes within minutes, so it is generally stored under oil or grease.
Potassium is a metal, specifically an alkali metal, identified as part of Group 1 on the periodic table. Metals are characterized as shiny, malleable, ductile, and excellent conductors of heat and electricity.
Explanation:Potassium, denoted by the symbol 'K' on the periodic table, falls into the category of metals. As part of Group 1, it is an alkali metal. Metals are characterized by their shininess, silvery color (in most cases), excellent conductivity of heat and electricity, malleability, and ductility. To classify an element as a metal, nonmetal or metalloid, it's important to examine its location on the periodic table. Generally, metals occupy the left three-fourths of the periodic table while nonmetals are clustered in the upper right-hand corner. Metalloids, or semimetals, have intermediate properties and lie adjacent to the line dividing metals and nonmetals on the right-hand portion of the periodic table.
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3 Ag2S + 2 Al + 3 H2O --> 6 Ag + Al2O3 + 3 H2S
How many grams of H2O are used if 75 grams of Al are used?
Answer: really hard
Explanation: I wish I knew how to help you
How do you find the formula for the ionic compound of sodium chromate?
Pls show all working out ty;)
Answer:
Explanation:
Sodium chromate has the chemical formula Na2CrO4, and a molar mass of 161.97 g/mol. It is a salt made of two sodium cations (Na+) and the chromate anion (CrO4-) in which the chromium atom is attached to four oxygen atoms.
What is the wavelength of a wave with a
velocity of 50 m/s and a frequency of 5 Hz?
Answer:
Wavelength is 10m
Explanation:
To solve this problem, we use the formula for wavelength
Wavelength = wave velocity / frequency
Wavelength = 50m/s / 5Hz
= 10m
Answer:
10 m
Explanation:
Calculate the volume of 817.5g of CH4 at STP.
Answer:
The volume is 1143,78 L
Explanation:
We use the formula PV=nRT. The conditions STP are 1 atm of pressure and 273K of temperature. We calculate the weight of 1 mol of CH4.
Weight 1 mol CH4= weight C+ (weight H)x4= 12 g + 1 g x4= 16 g/mol
16 g----1 mol CH4
817,5g--x=(817,5gx1 mol CH4)/16g= 51, 1 mol CH4
PV=nRT V=(nRT)/P
V= (51,1 mol x 0,082 l atm/K mol x 273 K)/1 atm
V= 1143,78 liters
As we move across the periodic table, from potassium, K, to krypton, Kr, we see the following changes. All BUT ONE is
correct
A) Elements change from solids to gases.
B) Elements change from metals to metalloids to nonmetals.
C) Valence electrons increase beginning with one and ending with eight.
D) The charge of ions changes: negative to the left and positive to the right
Answer: D is wrong
Explanation: The charges go from positive in the left to negative to the right.
Task Card #1
A science fair volcano bubbles and fizzes.
What is taking place?
À Solid formation
B. Gas formation
C. Color change
Answer:
B. Gas formation
Explanation:
When you combine baking soda and vinegar - which I'm assuming happened to create this reaction - it forms carbon dioxide, a gas.
The bubbling and fizzing in a science fair volcano is a result of gas formation due to the chemical reaction between baking soda and vinegar which produces carbon dioxide gas.
Explanation:When a science fair volcano bubbles and fizzes, a chemical reaction takes place, specifically a gas formation. In a typical science fair volcano, baking soda (a base) and vinegar (an acid) are combined. This results in the formation of carbon dioxide gas which is what causes the 'bubbling' and 'fizzing' effect. It's a common demonstration of how some chemical reactions result in the production of gas. The gas then escapes the liquid in the form of bubbles causing the eruption we see.
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Una sustancia que ocupa el volumen de 70mL y una masa de 165g
Answer:
The density of the substance is 2.357 g/mL
Explanation:
Given that the substance has a mass of 165 g and occupies a volume of 70 mL, I'm assuming that the question missing is: What is its density?
Density (ρ) is computed as follows:
ρ = mass/volume
ρ = 165 g/ 70 mL
ρ = 2.357 g/mL
please help me out...
a. how many atoms are in 1.008 grams of hydrogen?
b. how many atoms are in 12.011 grams of carbon?
c. how many atoms are in 22. 989 grams of sodium?
d. how many atoms are in 63.55 grams of copper?
e. what is the mass of 1 mole of Br atoms?
f. what is the mass of 1 mole of Ag atoms?
g. what is the mass of 1 mole of Ca atoms?
This response uses the concept of a mole and the principles of molar mass to calculate the number of atoms in various substances as well as the corresponding molar masses for different elements.
Explanation:To solve these problems, we need to understand the concept of a mole. A mole is a quantity in chemistry that helps us count entities at the atomic and molecular scale. One mole equals Avogadro's number (6.02214076 x 10^23 entities).
Also, one mole of any element in grams is equal to its molar mass (usually found under the symbol in the periodic table).
The molar mass of Hydrogen (H) is 1.008 g/mol. So 1.008 g of Hydrogen contains 1 mole or 6.022 x 10^23 atoms.The molar mass of Carbon (C) is 12.011 g/mol, which implies that a 12.011 g sample of Carbon contains the same number of atoms, 6.022 x 10^23 atoms.In 22.989 g of Sodium (Na), there are also 6.022 x 10^23 atoms since Sodium's molar mass is 22.989 g/mol.Similarly, in 63.55 g of Copper (Cu), being Copper's molar mass, there are also 6.022 x 10^23 atoms.The molar mass of Bromine (Br) is roughly 79.904 g/mol.The molar mass of Silver (Ag) is roughly 107.87 g/mol.The molar mass of Calcium (Ca) is roughly 40.078 g/mol.Learn more about Mole Calculations here:https://brainly.com/question/33652783
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Which is not a Lewis acid-base reaction?
I believe it would be the last one. It just amplified the acid, which is (2. Al)(2.Cl3)-> Al2Cl6
Hope it helps!
A neutralization reaction, such as between hydrochloric acid and sodium hydroxide, is not considered a Lewis acid-base reaction as it does not involve the transfer of electron pairs.
Explanation:A Lewis acid-base reaction refers to a reaction involving the transfer of an electron pair. The Lewis acid accepts the electron pair, while the Lewis base donates it. An example that does not fit the definition of a Lewis acid-base reaction would be the neutralization reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH), which produces water (H2O) and salt (NaCl). This reaction does not involve the transfer of electron pairs, and hence, is not a Lewis acid-base reaction.
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Empirical formula of C6H12O6
Answer:
The empirical formula of glucose is CH2O
Explanation:
The formula for glucose is C6H12O6
To calculate the empirical formula of glucose, we need to know the number of mole of each element present in the compound.
Since the moles have been given in the formula of glucose C6H12O6
There are 6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen
Since we've known the number of moles already,so we pick the mole with the smallest number and divide through with it
C - 6/6 = 1
H - 12/6 = 2
O - 6/6 = 1
Therefore, the empirical formula of glucose C6H12O6 is CH2O
HELP PLEASE
In two or more complete sentences describe all of the van der Waals forces that exist between molecules of sulfur
dioxide, SO-2
Answer:
Dipole-Dipole attraction
Explanation:
Dipole-dipole attraction is a type of vander waals forces found in the molecules of sulfur dioxide.
Vander waals forces are weak attractions joining non-polar and polar molecules together. They are of two types:
London dispersion forces which are weak attractions found between non-polar molecules.
Dipole-Dipole attraction are the forces of attraction which exists between polar molecules. Such molecules have permanent dipoles. This implies that the positive pole of one molecule attracts the negative pole of another. This is what happens between the oxygen and sulfur molecules.
A swimmer can swim at a speed of 2.8 m/s for 6
minutes. What distance will she cover in that
time?
Answer: 1008 metres
Explanation:
speed of swimmer = 2.8 m/s
Time taken = 6minutes
(since speed is in metres per second, convert time in minutes to seconds
If 1 minute = 60 seconds
6 minute = 6 x 60 = 360 seconds
distance = ?
Since, speed is the distance covered divided by time taken in seconds, thus
Speed = distance / time
Distance = speed x time taken
distance = 2.8m/s x 360
= 1008 metres
Thus, the swimmer cover a distance of 1008 metres
A(n) _________________ solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is ________________. *
Answer:
An unsaturated solution can dissolve more solute at the given temperature. If you add more solute until the solution will dissolve no more at that temperature, it is saturated solution.
Explanation:
In unsaturated solution, there is capacity of solution to dissolve more solute inside the solution. In saturated solution, there is no capacity of a solution to dissolve any further solute at a given temperature. This capacity is increased by heating the solution so more solute will be dissolved. This is called supersaturated solution.
1. Compare How do
residual soil and transported
soil differ?
Residual soil and transported soil differ by as follows:
Residual soil stays over its parent rock and transported soil forms from particles from another place.
Explanation:
Soil forms from weathering of rock. When a rocks get weathered it creates small paiticles. That forms different kind of soil. Soil varies in texture, structure, colour, composition and in pH level. Each and every soil type produced from parent rock. Depending upon the character of parent rock soil type is determined like basalt the igneous rock forms black soil.
Residual soil stays over parent rock it does not get off by the activities of natural agents like air, water, wind and glacier. Transported soil comes from hilly area to flat topped ground by transportation through some transporting agents of nature. It is immature soil.
What do chemists express the rates of chemical reaction?
Answer:
They represented rate of chemical reactions are the rate of change in concentration of products or reactants in a reaction
Answer:
Rate of a chemical reaction = change in concentration of a reactant or product per unit time.
It can be expressed in two terms:
1) The rate of decrease in concentration of any of the reactants.
2) The rate of increase in the concentration of any of the products.
Explanation:
Rate of reaction is the speed at which reactants are converted into products or the rate at which products are produced from reactants.
can someone please help me with this asap
what is the value of d
The value of "d" is 80°
Explanation:
Cyclic quadrilaterals are the special group of quadrilaterals with all its base lying on the circumference of the circle. In other words, a quadrilateral inscribed in a circle is called a cyclic quadrilateral.
Cyclic quadrilateral are characterised by some special features such as
Sum of opposite angles of a cyclic quadrilateral is always a supplementary angle. If one of the sides of a cyclic quadrilateral is produced, then the exterior angle so formed is always double of the corresponding interior angle.Using the property 1
We find that since the quadrilateral is cyclic, opposite pairs must be supplementary
100° +∠D must be equal to 180°
D=180° -100° =80°
What is the mass , in grams, of 0.802 mol of salicylic acid?
Answer:
110.76 are the grams I think?
Explanation:
I’ve been up all night doin chemistry, can someone please give me the answers
The students in the picture below are using a globe and a lamp to model the Sun and the Earth. If the model Earth acts the same as the real Earth, what will happen as the students spin the model?
A. Different parts of the model Earth will have different seasons.
B. All of the model Earth will have daytime at the same time.
C. A new year will start each time the model Earth makes a complete turn.
D. Some parts of the model Earth will have daytime and some will have night.
Answer:
The only one that makes sense IF the model behaves as the Earth is D.
Explanation:
Answer
D. Some parts of the model Earth will have daytime and some will have night.
Explanation:
i got it right~
Plzz Someone
SrBr2 + (NH4)2CO3 → SrCO3 + 2 NH4Br
If 2.1993 moles of (NH4)2CO3 are reacted, how many grams of SrCO3 will be produced?
Answer:
324.6g
Explanation:
From this given problem, it is desirable to solve from the known specie to the unknown.
The balanced chemical combination is given as:
SrBr₂ + (NH₄)₂CO₃ → SrCO₃ + 2NH₄Br
Given;
2.1993 mole of (NH₄)₂CO₃ ;
Unknown:
Mass of SrCO₃ produced;
From the balanced equation, we see that;
1 mole of (NH₄)₂CO₃ reacted to produce 1 mole of SrCO₃
2.1993 mole of (NH₄)₂CO₃ will produce 2.1993 mole of SrCO₃
Mass of SrCO₃ produced = number of moles x molar mass of SrCO₃
Molar mass of SrCO₃ = 87.6 + 12 + 3(16) = 147.6g/mol
Mass of SrCO₃ = 2.1993 x 147.6 = 324.6g
2.1993 moles of (NH4)₂CO₃ reacted will produce approximately 324.74 grams of SrCO₃.
The question asks how many grams of SrCO3 will be produced if 2.1993 moles of (NH4)₂CO₃ are reacted according to the chemical equation:
SrBr₂ + (NH4)₂CO₃ → SrCO₃ + 2 NH₄Br
Firstly, it's essential to note that the balanced chemical equation indicates a 1:1 mole ratio between (NH4)₂CO₃ and SrCO₃. Given this ratio, the moles of (NH4)₂CO₃ reacted will equal the moles of SrCO₃ produced. Hence, 2.1993 moles of (NH4)₂CO₃ will produce 2.1993 moles of SrCO3.
The molar mass of SrCO₃ (strontium carbonate) is approximately 147.63 g/mol. To convert moles of SrCO₃ to grams, multiply the moles by the molar mass:
2.1993 moles of SrCO₃ × 147.63 g/mol = 324.74 grams of SrCO₃
Therefore, 2.1993 moles of (NH4)₂CO₃ reacted will produce approximately 324.74 grams of SrCO₃.
If the attractive forces in a substance is much less than the
molecular motion, then the substance will be in
state.
a
Solid
b Liquid
c Gaseous
d Both Solid and Liquid
Answer:
If the attractive forces in a substance is much less than the
molecular motion, then the substance will be in a "Gaseous" state.
Explanation:
When decreasing the attractive forces in a substance and making it "much" less than the molecular motion in the substance, the substance should be in a gaseous state.
When the average kinetic energy of a substance or object is small enough that the attractive forces is stable enough to hold all of the particles close together, the molecules in liquids and solids do not move apart.
If the average kinetic energy of a substance or object is great enough (greater than the attractive forces) to overpower the attractive forces between them, the molecules are able to move apart. This would mean that the substance is in a gaseous state.
Overall, if the attractive forces are less than the molecular motion then the molecular motion will over power the attractive forces, breaking the molecules apart and letting them move freely as molecules in a gaseous substance would.
If the forces of attraction are less than the molecular motion , then substance will be in gaseous state.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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2C4H10(g) + 13O2(g) → 8CO2(g) + 10 H2O(g) How many moles of O2 are required to react completely with 5.00 moles C4H10?
Answer:
32.5 moles of oxygen are required.
Explanation:
Given data:
Number of moles of C₄H₁₀ = 5.00 mol
Number of moles of oxygen required = ?
Chemical equation:
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
Now we will compare the moles of oxygen with C₄H₁₀ through balanced chemical equation.
C₄H₁₀ : O₂
2 : 13
5.00 : 13/2×5 = 32.5
So when 5 moles of C₄H₁₀ are present 32.5 moles of oxygen are required to react completely.
Answer:
32.5
Explanation:
What information can you infer from the Lewis structure diagram shown below? (2 points)
Group of answer choices
Boron has three valence electrons.
Oxygen has three valence electrons.
Boron has one valence electron.
Oxygen has one valence electron.
Answer:
FLVS
Boron has three valence electrons.
Explanation:
I put the one and it was incorrect.
Answer:
Boron has 3 valence electrons
Explanation:
A 3.0-L gas mixture contains 30.% oxygen and 70.% nitrogen. Use the ideal gas law to determine the number of moles of oxygen at 2.0 atm and 400-K.
Answer:
The number of moles of oxygen gas comes out to be 0.0548 mole
Explanation:
Given volume of gas = V = 3.0 L
The mixture contains 30 % oxygen gas by mole.
Pressure of mixture of gas = P = 2.0 atm
Temperature = T = 400 K
Assuming n be the total number of moles of the mixture of gas.
The ideal gas equation is shown below
[tex]\textrm{PV} = \textrm{nRT} \\2.0 \textrm{ atm}\times 3.0\textrm{ L} = n \times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1} \times 400 \textrm{ K} \\n = 0.18270 \textrm{ mole}[/tex]
The mixture contains 30% oxygen gas by mole
[tex]\textrm{ Number of moles of oxygen gas} = \displaystyle \frac{30\times 0.18270 \textrm{ mole}}{100} = 0.0548 \textrm{ mole}[/tex]
Number of moles of oxygen gas is 0.0548 mole
Final answer:
At 2.0 atm and 400 K, there are 0.9 moles of oxygen in the 3.0-L gas mixture that contains 30.% oxygen and 70.% nitrogen, as determined using the ideal gas law.
Explanation:
To calculate the number of moles of oxygen, we first need to find the total number of moles in the mixture using the ideal gas law:
n = PV / RT
where n is the number of moles, P is the pressure in atmospheres, V is the volume in liters, R is the ideal gas constant (8.31 J/mol·K), and T is the temperature in kelvins.
Substituting our values into this equation, we get:
n = (2.0 atm)(3.0 L) / (8.31 J/mol·K)(400 K) = 0.069 moles total
we need to find the fraction of moles that is oxygen:
x = (mass of oxygen) / (total mass) = (30.%)(0.069 moles total) = 0.021 moles oxygen
we can use this fraction to find the number of moles of oxygen:
n(O₂) = x(n total) = (0.021 moles oxygen) / (total moles) = (0.9 moles oxygen) / (total moles) = 0.9 moles oxygen
Which type of nuclear radiation is being emitted here?
Answer:
b.Beta
Explanation:
mass number remains constant while atomic number has been increased by 1 unit . beta is electron like element where its mass number is 0 and atomic number is -1.
The nuclear radiation being is emitted in the given radioactive decay is beta radiation.
Beta radio decay :
It is the type of radioactive decay in which negative beta particles and are emitted resulting in isobaric nucleus with 1 extra proton.
Characteristics
It occurs in the nucleus that has too many neutrons than protons.A neutron change into proton and emits beta particles and electrons.The atomic number of the resulting nucleus increased by one but the atomic mass remains the same.In the picture atomic number is increased by one but atomic mass remains the same.
Therefore, the nuclear radiation being is emitted in the given radioactive decay is beta radiation.
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