Answer:
D
Explanation:
ap
The statement that best describes the reaction [tex]\rm H_2(g) + Cl_2(g) \rightarrow 2HCl(9), AH = -184.6[/tex] is the reaction has no activation energy.
What is activation energy?Activation energy is the small amount of energy which is required to start a reaction.
This is the kinetic energy of the reactant molecules, which helps them to collide.
High activation energy means the reaction will be slow.
Low activation energy means a high rate of energy.
Thus, the correct option is B.
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The specific heat of water and steam (water vapor) are 4.18
J/gºC and 2.10 J/gºC respectively. Heating a 74.0 g sample of
water from 88.3 °C to water vapor at 112.5 °C requires 172.58 kJ
of heat. Calculate the heat of vaporization of water in kJ/g.
Assume the boiling point of water is 100 °C.
please help
Answer: 2.26
Explanation:
The heat of the vaporization of water is equal to 2.33 KJ/g.
What is the specific heat capacity?The specific heat capacity can be explained as the quantity of heat required to raise the temperature in one unit of substance by 1 degree Celcius.
The specific heat can be represented in terms of gained or lost heat:
Q = mCΔT
The heat of vaporization can be described as the amount of heat required to turn one gram of a liquid into a vapor, without an increase in the temperature of the liquid.
Given, the amount of heat gained by water, Q = 172.58 kJ
The change in the temperature = 112.5 - 88.3 = 24.2 °C
The specific heat capacity of the water = 4.184 J/g°C
The mass of the water, m = 74 g
The heat of vaporization of water H = q/m
H = 172.58/74
H = 2.33 KJ/g
Therefore, the heat of the vaporization of water is equal to 2.33 KJ/g.
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give 7 and example of how each wave in the EM spectrum in used in our daily lives
Help! Please I am in a hurry! Will give brainliest for right answer!
Answer: Wht is it
Explanation:
Let me know so I can help
A gas sample is made entirely of carbon dioxide and water, and there are 300 moles of CO2 and 500 moles of H2O. If the total pressure of the sample is 21 atm, what is the partial pressure of H2O ? Ptotal = Pa + Pb+ Pc....... Pa = Xa(Ptotal)
Answer:
Explanation:
Total moles = 300 + 500 = 800 moles
mole fraction of carbon dioxide = 300 / 800 = 3 / 8
water = 500 / 800 = 5 / 8
Total pressure = 21 atm
partial pressure of water = total pressure x mole fraction of water
= 21 x 5 / 8
= 13.125 atm
What happens in a double-replacement reaction?
A. An element replaces an element in another compound.
B. Two reactants combine to form one compound.
C. One compound separates into two or more products.
O D. The elements in two compounds switch places
Answer: D
Explanation: trust
Answer:
Explanation:
D
20 ML of a gas at 200 K is heated until the new volume is 55ML what is the final temperature of the gas
Answer:
T2 = 550K
Explanation:
From Charles law;
V1/T1 = V2/T2
Where;
V1 is initial volume
V2 is final volume
T1 is initial temperature
T2 is final temperature
We are given;
V1 = 20 mL
V2 = 55 mL
T1 = 200 K
Thus from V1/T1 = V2/T2, making T2 the subject;
T2 = (V2 × T1)/V1
T2 = (55 × 200)/20
T2 = 550K
Neutrons do not affect the overall charge of the atom.
True or false
Neutrons do not carry an electrical charge so adding or removing them from the nucleus does not change the electrical charge of the nucleus.
So your answer is true
Electron configuration for elements 1-21
Answer:
Hope this helps
Explanation:
ook at the graph above showing the composition of air. Which component is the solvent?
A.
nitrogen
B.
other gases
C.
None of them are solvents.
D.
oxygen
Answer:
Nitrogen
Explanation:
Study Island
Which is the right answer?
Answer:
i think its C
Explanation:
5. You encounter a material that is white, powdery, with a low melting point, and no luster.
Is this material likely to be made of a metal or a nonmetal? Justify your answer. (5 pts)
CH4+O2→2H2O+CO2
Which element or elements are unbalanced in this equation?
C, H, and O are all unbalanced.
Both Hand O are unbalanced.
Only the O is unbalanced.
Only the His unbalanced.
Answer:
O
Explanation:
CH4+2O2=CO2+2H2O is the correct ans
Answer:
CH4+2O2=CO2+2H2O is the correct answer
Explanation:
Zinc metal reacts with copper sulfate through the following
reaction:
Zn + CuSO4 → Cu + ZnSO4
The percent yield for a reaction in which 32.5 g of Zn is
reacted in excess CuSO4 solution is 85.0 %. What is the
actual yield of copper of this reaction?
g
Your answer should be rounded to three significant figures. Do not include
units in your answer.
Answer:
26.9
Explanation:
A 800 kg car zooms away from a red light with an acceleration of 7.6 m/s2. What is the
average net force in Newtons that the car experiences?
Answer:
6080 N
Explanation:
From the question given above, the following data were obtained:
Mass (m) of car = 800 Kg
Acceleration (a) of car = 7.6 m/s²
Force (F) =?
The force experienced by the car can be obtained as illustrated below:
Force (F) = mass (m) × acceleration (a)
F = m × a
F = 800 × 7.6
F = 6080 N
Thus, the experience a force of 6080 N
A car drivers 120miles in 3 hours.what is average speed of the car??
Answer:
40 mph
Explanation:
Speed = Distance/Time
Take the total distance driven by the car and divide it by the total amount of hours driven.
120/3 = 40
question.
Which of the following events must occur at point 6 in order to transform sedimentary rock into igneous rock?
A
Shifting tectonic plates push the sedimentary rock toward the poles, where it freezes and hardens into igneous rock.
B
Extreme winds and storms weather the sedimentary rock into particles, which collect in rivers and are compacted into igneous rock.
C
Rising oceans erode mountains of sedimentary rock into particles, which sink and get compacted into layers that form igneous rock.
D
Tectonic plates push against each other, driving sedimentary rock under Earth's surface, where it melts into magma and turns into igneous rock as it cools
Answer:
I belive the answer is D
Transpiration meaning and examples
Explanation:
Transpiration is the movement of water through plants using the xylem and also their loss from plants surfaces.
Water is a lost from plants from the leaves and the stomata. This water is usually replaced by the absorption of water by the root.
Transpiration is an important part of the water cycle in the biosphere. Significant amount of water is lost from plant in the process of transpiration. Transpiration water condenses in the atmosphere to form rain clouds.An example of transpiration when water loses water from their leaves.
There are _____ Chemical families in the periodic table.
Explanation:
18
In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. There are 18 numbered groups in the periodic table; the f-block columns (between groups 3 and 4) are not numbered.
Calculate the wavelength of microwaves that have a frequency of 5.67 x 10¹¹ Hz. Please give your answer in scientific notation to the hundredths place. (Don't forget unit!) *
The energy on the earth
Answer:
The earth-atmosphere energy balance is the balance between incoming energy from the Sun and outgoing energy from the Earth. When it reaches the Earth, some is reflected back to space by clouds, some are absorbed by the atmosphere, and some is absorbed in the Earth's surface. ...
Explanation:
3.which of the following does not affect the solubility of solid solutes?
A.Volume of solvent
B.stirring
C.temperature
D.amount of solvent
PLEASE ANSWER CORRECTLY
ASAP
Answer:
Volume of solvent.... Pretty straight forward
Answer:
A. volume of solvent
Explanation:
if u stir then the rate of solubility will increase
when the solvent is hot it will increase the rate of solubility and vice versa
What would be the change in
temperature if 5.0 g of water
absorbed 209 J of heat?
Answer: he temperature of 100 grams of water changes from 16°C/7 How many kilojoules of heat are absorbed when 70.00 grams to 20°C.
Explanation: I hope that helped!
Which model shows 6 electrons in the outer shell of the atom?
Answer:
The models which shows 6 electrons in the outer shell are Oxygen, Sulfur, Selenium, Tellurium and the radioactive element Polonium
What solid materials were dissolved in water?
Explanation:
salt, sugar and coffee :)
How is energy sent from Earth to space?
conduction and convection
radiation and conduction
reflection and conduction
radiation and reflection
Answer:
radiation and reflection
Explanation:
Energy is send from space to earth by radiation and reflection. The most predominant way in which heat is transferred from earth to space is by radiation.
The source of energy for the earth is heat from the sun. This heat can be sent back to space when they are reflected back from the earth and radiated into space.Answer:
radiation and reflection
hope helps you
have a nice day
Which of the following is a solid fuel (multicorrect)
(a)Petrol
(b)Diesel
(c) Wax
(d)Coal
Answer:
the answer is coal
Explanation:
Want brainlyest? come and answer this "question"!
What are chemical formulas? Give an example of a chemical formula.
The number of compounds possible are limited by what three factors?
Which individual elements make up the following common compounds?
CaCO3
CaCl2
C3H6O
HCl
Ca(OH)2
Answer: A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound. here's an example Acetic acid formula CH3COOH. the compound factors it is The electron affinity or the ionising potential. here are elements of making compounds CaCo3 is a Calcium and a carbonate CaCl2 is a calcium and a chlorine
C3H60 is three Calcium’s and 60 hydrogens
HCL is one hydrogen and a chlorine
Ca(OH)2 is one calcium and two hydroxides (OH-).
Explanation: I hope that was helpful !
is the following true or false every element in the periodic table follows the aufbau principle
Answer:
True
Explanation:
It is true that every element in the periodic table follows the Aufbau's principle.
The principle states that "the sublevels with lower energies are filled up before those with higher energies".
Sublevels do not fill up in numerical order. This is true when writing the electronic configuration of all atoms on the periodic table.Answer:False
Explanation:
WILL GIVE BRAINLIEST A student heated some matter, which caused some of its properties to
change. A change in which two properties would indicate that the matter
underwent a chemical reaction?
A. State
B. Temperature
C. Melting point
D. Color
Answer:
Color and Melting Point
Answer:
Explanation:
Color melting point
Which of these best describes a flight that is approaching the speed of
sound?
A. More drag is created because the air molecules are not moving
out of the way of the airplane.
B. Subsonic speeds help the engines work more efficiently.
C. Less lift is created because there are fewer air molecules.
O D. There is not enough thrust to propel the airplane past the sound
waves.
Answer:
More drag is created because the air molecules are not moving out of the way of the airplane. This is 100% correct, just did the test
Explanation: a pe x
The faster an object vibrates, the higher is the frequency and higher will be the pitch of the sound. During a flight approaching the speed of sound More drag is created because the air molecules are not moving out of the way of the airplane. The correct option is A.
What is sound?The sound is defined as a vibration which propagates as an acoustic wave, through a transmission medium such as a gas, liquid or solid. The speed of a sound wave is affected by the medium through which it travels. Sound travels fastest in solids.
In aerodynamics, drag refers to the forces that oppose the relative motion of an object through the air. Drag always opposes the motion of the object and in an aircraft is overcome by thrust. Drag is a rearward force caused by the disruption of airflow by wing.
So here when a flight is approaching the speed of sound more drag is created.
Thus the correct option is A.
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