The change in enthalpy associated with the change in the water’s temperature is 1254 J.
What is specific heat?The amount of heat required to increase the temperature of one gram of a substance by one Celsius degree is known as specific heat.
Enthalpy change will be calculated as:
ΔH = -cmΔT, where
m = mass of water = 50g
c = specific heat of water = 4.18J/g°C
ΔT = change in temperature = 28 - 22 = 6 °C
On putting values in the above equation, we get
ΔH = -(4.18)(50)(6) = -1254 J
Hence change in enthalpy of the reaction is -1254 J.
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How many particles are in 0.645g of CaCl2
Answer:
~ 3.5 x 10^21
Explanation:
Mole weight of Ca Cl2 ( from periodic table ) = ~~ 111 gm
.645 gm / 111 gm / mole X 6.022 x 10^23 =
What is carbon's number of neutron,proton,atomic number,mass number
No. of Neutrons: 6
No. of Protons: 6
Atomic number: 6
Mass No: 12.011 u
The u means atomic mass unit.
Answer:
Everything is 6 except for mass number
Explanation:
neutron is 6
proton number is 6
atomic number is 6
mass number is 12.011 atomic mass units
__N2O5+__H2O->__HNO3
What's the reaction?
Answer:
N₂O₅ + H₂O --> 2HNO₃
This reaction is a combination reaction
Explanation:
I find that making a table is an easy way to balance a table. The table would be something like this:
Reactants (left) Products (right)
N = 2 N = 1
O = 6 O = 3
H = 2 H = 1
The number next the symbol represents how many of atoms of that particular element are present.
The aim is to make the number of atoms of each element on the left side to be equal to the number of atoms of each element on the right side. As we can see, there are 1 more nitrogen than on the right, 3 more oxygen than on the right and 1 more hydrogen than on the left.
So to make the numbers of atoms of each element on right equal to the number of atoms of each element on the left, we have to add a number. This number CANNOT be a subscript number because that would change the reaction.
We can add a 2 in front of the product (this is because there are less atoms in the right side of the equation).
N₂O₅ + H₂O --> 2HNO₃
This means there are now two HNO₃ molecules so every atom in this molecule is basically multiplied by 2. So 1 nitrogen atom becomes two (1 × 2 = 2), 3 oxygen atoms become 6 (3 × 2 = 6) and 1 hydrogen atom becomes 2 (1 × 2 = 2). If we were to make a table again with the following equation - N₂O₅ + H₂O --> 2HNO₃, the table would be as so:
Reactants (left) Products (right)
N = 2 N = 2
O = 6 O = 6
H = 2 H = 2
Now the equation is balanced as we can see the number each type of atom is the same on the right and left side.
Use the name to write the formula for the following ionic compound: scandium (III) hydroxide
Use the name to write the formula for the following ionic compound: titanium (IV) cyanide
Answer:
.
Explanation:
.
Br2 + NaCl → NaBr + Cl2
Answer:
NaBr is a reducing agent, Cl 2 is an oxidizing agent. ; Greenish-yellow gas with a pungent, irritating odor. [Note: Shipped as a liquefied compressed gas.]
Explanation:hope its help
1. Which creates a potential difference in an electric circuit
a voltage source
electric charges
a current source
a difference in height
Plese help me I need the answer right now
Answer:
voltage source
Explanation:
establishes an electric potential difference across the two ends of the external circuit and thus causes the charge to flow. The voltage source is the numerical value of this electric potential difference.
Which is a possible heat capacity for a bomb calorimeter?
A) 11.20 kJ/°C
B) 14.21 kJ/(kg°C)
C) 15.32 kJ/mol
D) 15.75 kJ/g
Formula for dinitrogen monoxide
Answer:
the formula is N₂O
Explanation:
How many particles are in 2.5 mol of water, H2O?
Answer: 1.5×1024 molecules
how the surface of the early Earth and its atmosphere have changed to
form the surface of the Earth and its atmosphere today,
Answer:
As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes.
Explanation:
A path along which electric charges flow is called
a?
Answer:
its an electric circuit
Explanation:
is a pathway in which current flows through.
Look at the following atom:
How many protons does this Beryllium have?
How many neutrons does this Beryllium have?
How many electrons does this Beryllium have?
Answer:
p= 4
e=4
n=5
Explanation:
When would a transformation of chemical energy to electrical energy occur?(1 point)
when the current becomes zero
when a reaction produces the same products
when there is chemical reaction between metals and nonmetals
\
when electrons stop moving between atoms
A transformation of chemical energy to electrical energy occurs when there is a chemical reaction between metals and nonmetals.
What is electrical energy?The movement of electrons from one atom to another is what results in electrical energy.
A battery is a device that converts chemical energy contained within its active materials directly into electric energy by means of an electrochemical oxidation-reduction (redox) reaction. This type of reaction involves the transfer of electrons from one material to another via an electric circuit.
Hence, option C is correct.
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PLEASE HURRY!!!!!!
1. Good health is dependent upon…
Proper food
Exercise
Rest
All of the above
2. Which of the following has the highest tetanus potential?
A cut by barbed wire at a dairy farm
The puncture of a kitchen knife
An infesting by ticks
The bite of a wild animal
3. (Select all that apply) The three general requirements for resisting disease are:
Exercising
Eating food high in calories
Getting plenty of rest
Eating food that will give you proper nutrition
Taking lots of vitamins
4. Which areas have the fastest population growth?
Agriculture
Suburban
Rural
Cities
5. Every nation has something to develop for the world’s benefit.
True
False
6. Hypothermia can be prevented by proper planning.
True
False
7. Not all land on Earth is currently habitable; ________________.
Therefore, there is not enough land left to inhabit.
Therefore, there is not enough land left to support the growing population
Therefore; there is not enough land left to farm
But, there still remains a vast amount of land to e inhabited all over the Earth
8. Tetanus is sometimes referred to as “lockjaw”.
True
False
9. (Select all that apply) The whooping cough and measles can be prevented by:
Washing hands
Mosquito netting
Sharing eating utensils
Checking for ticks
Vaccination
10. Rabies, typhus and malaria are…
Transmitted by animal bites
Disease which have been eradicated
All untreatable
Caused by viruses
11. Which of the following diseases is caused by a virus?
Malaria
Athlete's foot
Smallpox
Cholera
12. The two internal mechanisms that fight disease include white blood cells and _______.
Antibodies
Vaccines
THANK YOU FOR THE ANSWERS AND PLEASE HURRY! AMEN AND BLESS YOUR SOUL AND HEART!!!!
Answer:
1) d. all of the above
2) a. cut from a barbed wire at a dairy farm
3) check 3, 4, 5
4) b. suburban areas
5) true
6) is true
7) d. "but..."
8) true
9) check 1, 2, 5
10) a. animal bites
11) c. smallpox
12. antibodies
Which of the following describes how further studies supported the work done by Ernest Rutherford?
A. Max Planck formulated the Planck's constant.
B. Albert Einstein formulated the energy equation.
C. James Chadwick discovered neutral particles in the nucleus.
D. Joseph Proust stated that each compound has a fixed ratio of elements.
Answer:
c) James Chadwick discovered neutral particles in the nucleus
Explanation:
James Chadwick discovery of neutral particles in the nucleus best describes the further studies supported the work done by Ernest Rutherford. Hence, option (c) is the correct answer.
What is the molar mass of MgSO4?
Answer:
120.3676 g/mol
Science!
What compound releases chlorine or bromine in the stratosphere, threatening the ozone layer?
Answer:
Halocarbons.
Explanation:
Atmospheric measurements have clearly corroborated theoretical studies showing that chlorine and bromine released from halocarbons in the stratosphere react with and destroy ozone.
Which of these is a benefit of nuclear fusion?
A. It creates lower temperatures than nuclear fission reactions.
B. There is a lower risk of runaway chain reactions. C. Containment is easier for nuclear fusion.
D. It is less technically challenging than nuclear fission reactions.
Answer:
B. There is a lower risk of runaway chain reactions.
Answer:
b
explanation:
1. write the formula for the following ionic compound: Calcium Carbonate
Answer:
CaCO3
Explanation:
The molecule is formed by the calcium cation Ca+2 and the carbonate anion CO3−2.
what is the correct answer for box c?
yields
products
subscript
coefficient
reactants
Wetlands are able to remove nutrients and chemicals from water as the water flows through the area. A developer is planning to destroy most of the wetlands near a bay. In three to five sentences, explain how destroying the wetlands would impact the bay’s water quality and ecosystem.
hope this helps
Answer:
Wetlands are from being useless, disease-ridden places, wetlands provide values that no other ecosystem can. These include natural water quality improvement, flood protection, shoreline erosion control, opportunities for recreation and aesthetic appreciation and natural products for our use at no cost. Removal of the wetlands can result in fish disease, dominance of acid-tolerant species, contamination of groundwater, reduction in agricultural productivity and damage to infrastructure through corrosion. The loss of the wetlands introduces invasive species, either intentionally or unintentionally, these species can put pressure on native plants and eventually push them out of their native habitat.
Wetlands are from being useless, disease-ridden places, wetlands provide values that no other ecosystem can. These include natural water quality improvement, flood protection, shoreline erosion control, opportunities for recreation and aesthetic appreciation, and natural products for our use at no cost.
Removal of the wetlands can result in fish disease, the dominance of acid-tolerant species, contamination of groundwater, reduction in agricultural productivity, and damage to infrastructure through corrosion.
How are the wetlands being destroyed?
In the last three decades alone, nearly one-third of natural wetlands have been lost to urbanization, agriculture expansion, and pollution. The loss of wetlands in urban areas has been more rapid.
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How would one convert 15 seconds to hours?
Answer:
A
Explanation:
15 sec * 1 hr/3600 sec (note how 'sec' cancels out and you are left with 'hour' in your answer) = 15/3600 hour
Answer:
answer d
Explanation:
2Na + 2H20 - 2NaOH + H2
→
For the reaction shown here, predict the number of moles of both products, sodium hydroxide, and hydrogen gas, when ten moles of
sodium and ten moles of water fully react
A
B)
Ten moles of sodium hydroxide and ten moles of hydrogen gas will be
produced
Ten moles of sodium hydroxide and five moles of hydrogen gas will be
produced
Five moles of sodium hydroxide and ten moles of hydrogen gas will be
produced
moride and five moles of hydrogen gas will be
Answer: B) Ten moles of sodium hydroxide and five moles of hydrogen gas will be produced
Explanation: Got it right on USATestPrep
Look at the images below. Which model is the correct organization of an atomic model of an element?
A
B
C
???
Answer:
in this model is the correct organization of an atomic model of an element is C
2H2O2(aq) → 2H2(l) +O2(g) +196.4 kJ. What is the ∆H for a reaction in which 125 mL of 0.90 M H2O2 is completely decomposed?
Answer: When completely decomposed it will be -11 kJ
Bond polarity of Si and H
Answer:
Si 1.90
H 2.20
Explanation:good luck
draw a condensed structure of each of the following
1. 1,2,-propanediol
2. Ethyl methyl ether
3. Dichloromethane
The condensed structure of given compounds are shown in the below image.
What is functional group?Functional group is the specific group which is present in an organic compound gives information about the properties of that compound.
In 1,2-propanediol compound hydroxyl functional group is present on the 1st and 2nd position.In Ethyl methyl ether, ether functional group is present.In Dichloromethane, two atoms of chlorine groups are present.Hence, structure of the given compounds are shown in the below image.
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I will mark brainliest
Answer:
a b c are correct and rest of other are incorrect
How much energy is required to 100.0 g of ice at -2oc to water at 84.0oc
Answer:
A copper cup with a mass of 100.0 g contains 96.0 g of water. Both. the cup and the water are at 13.0OC. If 70.0 g of a substance at 84.0OC is added to the cup, the temperature increases to 20.0OC. If the specific heat capacities of copper and water are exactly 390 and 4180 respectively, find the specific heat capacity of the substance.
Explanation:
hope this helps
Convert 34.0 mm to inches. Please use dimensional analysis, I know the answer is 1.34in I just don’t know how to get there.
[tex]34.0mm\ x\ \frac{cm}{10mm}\ x\ \frac{in}{2.54cm}[/tex]
put your equation so that your units cancel. The 'mm' will cancel with each other which will get you 'cm' and then the 'cm' will cancel with each other which will get you 'in'.
34.0 millimeters converted to inches would be 1.3385 inches.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
Any additional quantity of that type can be stated as a multiple of the measurement unit.
Length is one of the most commonly used measurement parameters.
As given in the problem statement we have to convert Convert 34.0 mm to inches by using the dimensional analysis,
As we know that millimeters and inches, both are units of length,
1 millimeter = 0.0393701 inches
34.0 millimeter = 34.0× 0.0393701 inches
= 1.3385 inches
34.0 millimeters converted to inches would be 1.3385 inches.
Thus, 34.0 millimeters converted to inches would be 1.3385 inches.
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