Answers
The correct answer is D. Bears dig big holes in the ground to protect their young
Explanation:
The Earth spheres include the biosphere (life in the Earth), the hydrosphere (water bodies), the geosphere (rocks and other elements that compose land and soil), and the atmosphere (gases that compose the air). In this context, there is an interaction between two spheres: the biosphere and the geosphere, when a bear digs holes in the ground because a living organism that is part of the biosphere is modifying the structure and shape of superficial soil, which is part of the geosphere.
Answer: D
Explanation:
Related Questions
Need help with chemistry questions
Answers
Answer:
1. oxidation
2. reduction
3. oxidation
4. oxidation
Explanation:
Oxidation and Reduction in terms of hydrogen
Oxidation and Reduction with respect to Hydrogen Transfer. Oxidation is the loss of hydrogen. Reduction is the gain of hydrogen.Oxidation and Reduction in terms of Oxygen
Oxidation and Reduction with respect to Oxygen Transfer. Oxidation is the gain of Oxygen. Reduction is the loss of Oxygen.what is radiologist
Answers
Radiologists are medical doctors that treat injuries using medical imaging (radiology)
Answer:
a person who uses X-rays or other high-energy radiation, especially a doctor specializing in radiology.
Explanation:
Consider the reaction below.
Upper Z n (s) plus upper C u superscript 2 plus (a q) right arrow upper Z n superscript 2 plus (a q) plus upper C u (s).
Which half reaction correctly describes the oxidation that is taking place?
Z n (s) right arrow upper Z n superscript 2 plus (a q) plus e superscript minus.
Upper Z n (s) right arrow upper Z n superscript 2 plus (a q) plus 2 e superscript minus.
Upper C u superscript 2 plus (a q) plus 2 e superscript minus right arrow upper C u (s).
Upper C u superscript 2 plus (a q) plus e superscript minus right arrow upper C u (s).
Answers
Answer:
Explanation:
Zn(s) + Cu⁺( aq) ⇒ Zn⁺²( aq ) + Cu(s)
In oxidation reaction of an element or ion , the oxidation number is increased . Oxidation no is total charge on the atom or ion
In the following half reaction Zn(s) is oxidised to Zn⁺²
Zn( s ) ⇒ Zn⁺²(aq) + 2e⁻
In this reaction charge on Zn(s) is zero
After reaction charge on formed Zn⁺² is +2 . Hence there is increase in oxidation number from 0 to + 2 . Hence Zn(s) is oxidised to Zn⁺² ion .
PLEASE ANSWER QUICKLY!!!!
2KI (aq) + Cl₂(g) → 2KCl(aq) + 1₂(g)
What volume of 12 gas forms when
21 L Cl2 react at STP?
[?] L 12
Answers
The volume of 12 gas forms when 21 L Cl2 react at STP is 21 L.
To determine the volume of 12 gas (I assume you mean I2 gas) formed when 21 L of Cl2 reacts at STP (standard temperature and pressure), we need to use the ideal gas law equation.
The ideal gas law equation is given by:
PV = nRT
Where:
P = pressure
V = volume
n = number of moles
R = ideal gas constant
T = temperature
At STP, the pressure is 1 atm, and the temperature is 273.15 K.
From the balanced equation, we can see that the molar ratio between Cl2 and I2 is 1:1. So, if 21 L of Cl2 reacts, it will produce an equal volume of I2 gas.
Given that the volume of Cl2 is 21 L, we can assume the volume of I2 gas formed will also be 21 L.
Therefore, the volume of I2 gas formed is 21 L.
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Which two statements describe the seismic wave known as an S wave?
Answers
S wave is a mechanical wave rather than a electromagnetic wave and are transverse in nature.
What are electromagnetic waves?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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1. As an electron in an atom moves from a higher energy state to a lower energy state, the atom
(A) becomes a negative ion
(C) releases energy
(B) becomes a positive ion
(D) absorbs energy
Answers
Answer:
(C) releases energy
Explanation:
From Bohr's model of the atom, we can understand the energy transitions involved when an electron moves from one energy level to another.
An electron in an energy level has a definite amount of energy associated with it at that level. When electrons change state, they must absorb or emit the exact amount of energy which will bring them from initial to final states. When the electron is excited, it moves from the ground state to an excited state, it must must absorb energy. On returning from an excited state, energy is emitted.(C) releases energy
From Bohr's model of the atom:
We can understand the energy transitions involved when an electron moves from one energy level to another.
An electron in an energy level has a definite amount of energy associated with it at that level. When electrons change state, they must absorb or emit the exact amount of energy which will bring them from initial to final states. When the electron is excited, it moves from the ground state to an excited state, it must must absorb energy. On returning from an excited state, energy is released or emitted.Therefore, option C is correct.
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Is the spectrum
electromagnetic
of an element limited only to the visible region of the
spectrum?
Answers
The electromagnetic spectrum of an element is not limited only to the visible region of the spectrum.
What is an electromagnetic spectrum?An electromagnetic spectrum is a range of frequencies and wavelengths into which an electromagnetic wave is distributed into.
In Science, the electromagnetic spectrum consist of the following types of energy from highest to lowest frequency and shortest to longest wavelength:
Gamma raysX-raysUltraviolet radiationVisible lightInfrared radiationMicrowavesRadio wavesIn this context, we can infer and logically deduce that the electromagnetic spectrum of an element is not limited only to the visible region of the spectrum.
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The domain Archaea are unicellular prokaryotes and can be autotrophs or heterotrophs
true or false?
Answers
Answer:
I think its true I dont really know
Explanation:
true
Prioritise the type of hammer you would use to drive or shape material that could easily be damaged by hammers such as the following:
Answers
Some common types of hammers and their uses are
Claw hammer - used for driving nails and removing themSledgehammer - used for heavy-duty jobs like breaking concrete or driving stakesFraming hammer - used for framing houses and other construction workWhich hammers are used for delicate shpaes?When working with delicate shapes, the following types of hammers can be used
Rubber Mallet - It has a rubber head that is used to avoid damage to the surface of the material while striking.
Soft-Face Hammer - This hammer has replaceable soft tips made of materials like nylon, brass, or plastic that prevent damage to the surface.
To mention a few.
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What type of waves come out of the radio tower? Electromagnetic or Sound?
Answers
Answer:
Electromagnetic
Explanation:
Hope this helps
Classify each of the following values by the number of significant figures present in each. 8.314 J/mol-K 6.022x10 23 mol-1 12 mL 1.2 years 7.0 m2 50, cm 0,005 L 40.7 g 670.90 in 0.6258 mg 2.205 lb 3270 ft 90 m 5 significant 4 figuressignificant 3 figuressignificant 2 figuressignificant 1 figures
Answers
Answer:
5 significant figures: 670.90 in.
4 significant figures: 8.314 J/mol-K, 6.022x10 23 mol-1, 0.6258 mg, 2.205 lb and 3270 ft.
3 significant figures: 40.7 g.
2 significant figures: 12 mL, 1.2 years, 7.0 m2, 50, cm and 90 m.
1 significant figure: 0,005 L.
Explanation:
Hello,
In this case, we proceed as follows:
* 8.314 J/mol-K has 4 significant figures since 8, 3, 1 and 4 are significant (nonzero).
* 6.022x10 23 mol-1 has 4 significant figures since 6, 0, 2 and 2 are significant including the zero as it is at the right of the first nonzero digit (6).
* 12 mL has 2 significant figures since 1 and 2 are significant (nonzero).
* 1.2 years has 2 significant figures since 1 and 2 are significant (nonzero).
* 7.0 m2 has 2 significant figures since 1 and 2 are significant (nonzero).
* 50, cm has 2 significant figures since 1 and 2 are significant (nonzero).
* 0,005 L has 1 significant figure since 5 is the only nonzero digit.
* 40.7 g has 3 significant figures since 4, 0 and 7 are significant including the zero as it is at the right of the first nonzero digit (4).
* 670.90 in has 5 significant figures since 6, 7, 0, 9 and 0 are significant including the zeros as they are at the right of the first nonzero digit (6).
* 0.6258 mg has 4 significant figures since the first zero is at the left of the first nonzero digit, therefore, it is not included.
* 2.205 lb has 4 significant figures since 2, 2, 0 and 5 are significant including the zero as it is at the right of the first nonzero digit (2).
* 3270 ft has 4 significant figures since 3, 2, 7 and 0 are significant including the zero as it is at the right of the first nonzero digit (3).
* 90 m has 2 significant figures since 1 and 2 are significant (nonzero).
Regards.
compared to a phosphorus atom, a P-3 ion has
Answers
Answer:
3 electrons more
explanation
minus sign in chemistry means more
homeworkstudycom
6. How many moles are in 8.30 x 1023 molecules of CO₂?
a.
b.
C.
d.
1.37
2.8
55.5
100
Answers
What's the balanced chemical equation for sodium azide + water?
Answers
Consider this reaction, which occurs in the atmosphere and contributes to photochemical smog:
2Fe(s) + 3Cl2(g) →2FeCl3(s)
If there is 15.52 g Fe and excess Cl2 present, the reaction yields 34.5 g FeCl3. Calculate the
percent yield for the reaction.
%
Answers
2Fe(s) + 3Cl₂(g) →2FeCl₃(s)
mol Fe = 15.52 : 56 g/mol = 0.277
mol FeCl₃ = mol Fe = 0.277 (same coefficient)
mass FeCl₃ = 0.277 x 162.2 g/mol = 44.93 g
% yield = 34.5 : 44.93 = 76.79 %
Question 11. For the balanced equation shown below, howmany grams of CO will be produced, if 1380grams of Cl, are produced?4C2HCI+902=>8C0+10H2O+2Cl22. For the balanced equation shown below, how many moles of so, will be produced by1.09moles of SO,?2502+O2=>25033. For the unbalanced equation shown below, howmany moles of LizN reacted, if 3.65 grams of Liare produced?LizN=>Li+N24. Nitrogen gas and hydrogen gas are combined toform ammonia. What mass of ammonia can beproduced from a 10.00 gram sample of nitrogenis combined with an excess of oxygen.(N,+H2 →NH3)
Answers
Answer: the mass of CO produced is 2.181 x 10^3 g
Explanation:
The question requires us to calculate the amount of CO, in grams, that would be obtained in the reaction given, considering that 1380 g of Cl2 were produced.
The following chemical equation was provided by the question:
\(4C_2HCI+9O_2\rightarrow8CO+10H_2O+2Cl_2\)Note that the chemical equation is not properly balanced (there are 4 H atoms on the left side and 20 H atoms on the right side).The balanced chemical equation is as it follows:
\(4C_2HCI+5O_2\operatorname{\rightarrow}8CO+2H_2O+2Cl_2\)From the balanced chemical equation shown above, we can see that when 2 moles of Cl2 are produced, 8 moles of CO are produced. Thus, to solve this problem, we must calculate how many moles of Cl2 were obtained (considering the mass given, 1380 g), and then relate this amount with the stoichiometry of the reaction.
We can calculate the number of moles of a substance considering the following equation:
\(number\text{ of moles \lparen mol\rparen = }\frac{mass\text{ \lparen g\rparen}}{molar\text{ mass \lparen g/mol\rparen}}\rightarrow n=\frac{m}{M}\)The molar mass of Cl2 is 70.91 g/mol and the mass of this substance that was produced is 1380 g:
\(n=\frac{m}{M}=\frac{1380g}{70.91g/mol}=19.46mol\)Therefore, 19.46 moles of Cl2 were obtained.
Considering the stoichiometry of the reaction, given by the balanced chemical equation, we can write:
2 mol Cl2 -------------------------- 8 mol CO
19.46 mol Cl2 -------------------- x
Solving for x, we'll have:
\(x=\frac{(19.46mol\text{ C}l_2)\times(8mol\text{ CO\rparen}}{(2mol\text{ C}l_2)}=77.84mol\text{ CO}\)Therefore, 77.84 moles of CO were obtained in this reaction.
We can convert this amount of moles of CO to its correspondent mass, in grams, using the following equation:
\(n=\frac{m}{M}\rightarrow m=n\times M\)The molar mass of CO is 28.01 g/mol, thus its mass will be:
\(m=n\times M=77.84mol\times28.01g/mol=2.181\times10^3g\)Therefore, the mass of CO produced is 2.181 x 10^3 g.
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?
Answers
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.
As a result, the ice undergoes a phase change, from a solid to a liquid. This process is called melting. During melting, the temperature of the ice remains constant at 0°C because all the heat energy is used up in overcoming the intermolecular forces of attraction.The energy required to melt ice is known as the heat of fusion. The heat of fusion is the amount of heat energy required to change 1 kilogram of a solid into a liquid at its melting point. For water, the heat of fusion is 334 kJ/kg. This means that 334 kJ of heat energy is required to melt 1 kg of ice at 0°C. Therefore, during the melting of ice, the temperature of the ice does not change, but the internal energy of the ice does change, and this is manifested in the change of phase from a solid to a liquid.In summary, when heat is added to ice at 0°C, the temperature of the ice does not change, and all the heat energy is used up in overcoming the intermolecular forces of attraction between the water molecules in ice. This results in the melting of ice without any change in temperature.For such more question on molecules
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The city council of a small town wanted to add fluoride to their water so that all the residents would have healthier teeth. The mayor had read that ionic compounds must be used to get the fluoride into water. He looked up fluorine-containing compounds and came up with the following list.
NaF NF3 SiF4 CaF2 NH4F
Using academic vocabulary in paragraph form, discuss the following:
Explain which compound(s) could produce fluoride ions in the water. In your response, be sure to include:
° which of the listed compounds are ionic and which are covalent.
° how ionic and covalent compounds are different.
° why only ionic compounds would produce fluoride in water.
Answers
Answer:NaF is ionic. NF3 is covalent. SiF4 is ionic. CaF2 is Ionic and NH4F is also ionic. Ionic compounds transfer electrons whereas covalent compounds share electrons hence the word "co". Also, ionic compounds are formed with metal and nonmetal. Where a covalent is with 2 nonmetals. Only ionic compounds would produce fluoride in water because ionic compounds can dissolve in water and covalent compounds cant.
The compounds that can be used for the release of fluorine in water are NaF, \(\rm SiF_4\), \(\rm CaF_2\), and \(\rm NH_4F\).
The ionic compounds are formed by the transfer of electrons between the atoms of the compounds. The ionic bonds are weaker and are easy to dissociate in the aqueous solution.
The covalent compounds are formed by the sharing of electrons between the atoms. Since there is sharing, there has been a strong bond, that has been hard to dissociate.
The Mayor has to release Fluoride in the water, thus ionic compounds are preferred that have the easy release of fluorine.
From the given compounds:
NaF = Ionic compound\(\rm NF_3\) = Covalent compound\(\rm SiF_4\) = Ionic compound\(\rm CaF_2\) = Ionic compound\(\rm NH_4F\) = Ionic compoundThus the compounds that can be used for the release of fluorine in water are NaF, \(\rm SiF_4\), \(\rm CaF_2\), and \(\rm NH_4F\).
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What is true of spontaneous reactions?
O They are indicated by a negative change in Gibbs free energy.
O They have a positive value of AS.
O They are instantaneous.
O They always release heat.
Help 20pts
Answers
Explanation: Spontaneous reactions are those that occur without any external input of energy. A negative change in Gibbs free energy (ΔG) indicates that a reaction is spontaneous. The other options do not always hold true for spontaneous reactions. The value of entropy change (ΔS) can be positive or negative, spontaneous reactions are not necessarily instantaneous, and they do not always release heat.
Please help!!! Your reading assignment lists possible errors that can occur when conducting an experiment. Which of the following would be a possible error?
a) Humans making exact measurements when conducting experiments.
b) Humidity and temperature in the room may influence equipment
c) Making sure all equipment is clean and calibrated (carefully adjusted)
Answers
Answer:
The answer is B.
Explanation:
Systematic error arises from a faulty measuring device, imperfect observation methods, or an uncontrolled environment.
Answer:
your answer is a
Explanation:
The irreversible isomerization A
B was carried out in a batch reactor and the following concentration time data were obtained:
Time vs Concentration data in a Batch reactor
t 0 3 5 8 10 12 15 7.5
mol/h 4 2.89 2.25 1.45 1.0 0.65 0.25 0.07
Determine the reaction order,
, and the specific reaction a rate constant, k, using any method of your choice.
Answers
The reaction order and specific reaction rate constant can be determined by performing the kinetics experiment on irreversible polymerization A. Kinetic experiments can be used to investigate the rate and mechanism of chemical reactions. Chemical kinetics is the study of chemical reactions' speed and pathway.
The term "kinetics" refers to the study of reaction rates, which are determined by measuring the concentration of reactants and products as a function of time.Kinetics experiments can be used to determine the reaction rate and order of reaction. A chemical reaction's rate is defined as the change in the concentration of a reactant or product per unit time. The order of a reaction refers to the number of molecules that must react to produce a product. The order of reaction can be determined by measuring the initial rate of the reaction as a function of concentration.Methods for determining the reaction rate order include the initial rate method, the half-life method, and the integrated rate method. The initial rate method determines the reaction order by measuring the initial rate of the reaction at different reactant concentrations. The half-life method determines the reaction order by measuring the time it takes for the reactant concentration to decrease by half.The integrated rate method determines the reaction order by measuring the concentration of the reactant or product at different times.The specific rate constant can be determined by using the Arrhenius equation, which relates the rate constant to the activation energy, temperature, and frequency factor. The frequency factor can be determined by measuring the rate constant at different temperatures.For such more question on polymerization
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How many moles of HCl are needed to react with 0.87 moles of Na?
A:0.87 mol HCl
B:0.82 mol HCl
C:1.0 mol HCl
D:0.96 mol Na
Answers
The moles of HCl are needed to react with 0.87 moles of Na are the A:0.87 mol HCl.
How do you calculate moles of HCl?M = mol / L Calculate the molarity of an HCl answer which includes 18.23 g of HCl in 355. zero mL of answer. Calculate the wide variety of moles of HCl. Divide the wide variety of moles of HCl with the aid of using the overall quantity in liters.
We'll start with the aid of using writing the balanced equation for the reaction. This is illustrated below:Na+HCl->NaCl +H From the balanced equation above, 1 mole of Na reacted with 1 mole of HCI.Finally, we will decide the wide variety of moles of HCI required to react with 0.87 moles of Na. This may be acquired as illustrated below:From the balanced equation above,1 mole of Na reacted with 1 mole of HCI.Read more about the moles ;
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Need help with problem
Answers
The number of moles of CO in the given conditions is 2.51 moles. To calculate the number of moles of CO in the given conditions, we need to use the Ideal Gas Law equation:
PV = nRT
Where:
P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
First, we need to convert the given temperature in Celsius to Kelvin by adding 273.15:
T = 93°C + 273.15 = 366.15 K
Now we can plug in the values we have:
P = 4.52 atm
V = 20.0 L
R = 0.0821 L.atm/mol.K (gas constant for CO)
T = 366.15 K
n = PV/RT = (4.52 atm x 20.0 L)/(0.0821 L.atm/mol.K x 366.15 K) = 2.51 moles
Therefore, the number of moles of CO in the given conditions is 2.51 moles.
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The total age of 5 children aged 3 years is 50 years. Find the age of the youngest and oldest child?
Answers
Answer: See explanation
Explanation:
Here's the correct question:
The total ages of 5 children born at the intervals of 3 years each is 50 years. Find the age of the youngest and the oldest child.
From the information given, we can then make the following assumption with regards to their ages.
First child = y
Second child = y + 3.
Third child = y + 6
Fourth child = y + 9
Fifth child = y + 12
Therefore, y + y+3 + y+6 + y+9 + y+12 = 50
5y + 30 = 50
5y = 50 - 30
5y = 20
y = 20/5
y = 4
Youngest child = 4 years
Oldest child = y + 12 = 4 + 12 = 16 years
4. Both vitamins and minerals are called protective foods. (True/False)
Answers
Answer:
true
Explanation:
hope this answer helps :)
Answer:
true
Explanation
vitamins and minerals are protective foods
If a rubber ball has a pressure of 750 torr and a volume of 1.00 L, what will the new volume in milliliters be if the pressure is increased to 780 mmHg?
Answers
This question is based on Boyle's law as temperature is constant. Boyle's law is derived from ideal gas equation only at constant temperature. Therefore, the new volume is 9.375L.
What is Boyle's law?Boyle's law is a law which states that at constant temperature, the pressure that is exerted by an ideal gas on the walls of the container is inversely proportional to the volume occupied that gas.
Ideal gas is a gas where there is no forces of attraction or forces of repulsion between the particles . The volume of container is equal to the volume occupied by the gas.
Mathematically, Boyle's law can be written as
P₁V₁ = P₂V₂
P₁=initial pressure=750 torr
P₂=final pressure=80 torr
V₁ = initial volume= 1.00 L
V₂=final volume=?
V₂ = P₁V₁/P₂
V₂ = (750 × 1.00)/80
V₂ = 9.375L
Therefore, the new volume is 9.375L.
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What do you call a small rocky or metallic object that has crashed on the surface of the Earth?
Meteor
Meteorite
Asteroid
Meteoroid
Answers
In the reaction of silver nitrate with copper metal, metallic silver comes out of solution, and the solution turns blue. This as a ________ reactio
Answers
Answer:
Single displacement reaction.
Explanation:
Hello!!
In this case, since the reaction between silver nitrate and copper metal is:
\(2AgNO_3(aq)+Cu(s)\rightarrow 2Ag(s)+Cu(NO_3)_2(aq)\)
As silver was forming silver nitrate, due to the presence of copper, which has the capacity to displace silver out of the salt, we notice the formation of solid silver and a resulting copper (II) nitrate which is blue in aqueous solution.
Therefore, this is a single displacement reaction, because the the lonely copper displaced the silver.
Best regards!
The temperature of a sample of gas in a steel container at 25.0 kPa starts at -50 C and decreases by a factor of three. What is the final pressure inside the tank?
Answers
Answer: The final pressure inside the tank is 8.41 kPa.
Explanation: We can use the combined gas law to solve this problem, which relates the pressure, volume, and temperature of a gas:
(P1V1)/T1 = (P2V2)/T2
where P1, V1, and T1 are the initial pressure, volume, and temperature, respectively, and P2, V2, and T2 are the final pressure, volume, and temperature, respectively.
We are given P1 = 25.0 kPa, T1 = -50 C = 223 K, and V1 is unknown. We also know that the temperature decreases by a factor of three, so T2 = T1/3 = 223/3 K.
To find V2, we need to assume that the steel container is rigid and its volume remains constant. Therefore, V1 = V2, and we can cancel out the volume from the equation:
P1/T1 = P2/T2
Substituting the values, we get:
P2 = P1 * T2 / T1 = 25.0 * (223/3) / 223 = 8.41 kPa
Therefore, the final pressure inside the tank is 8.41 kPa.
Answer:
So if pressure of a gas is increased by 25%, the volume of a gas is decreased by 25%.
Explanation:
in a pond food chain that includes tadpoles, algae, turtles, dragonflies, and frogs, which one is the primary consumer
Answers
Answer:
turtles
Explanation:
Turtles eat frogs and no animal in the pond can consume a turtle