Answer:
2.5 kilo calories
Explanation:
1 Calories = 0.001 Kilocalories
10 Calories = 0.01
Kilocalories 2500
Calories = 2.5 Kilocalories
Answer:
2.5 kilocalories.
Explanation:
2500 divided by 100 to get to kilo is 2.5
The primary cause for an increase in atmospheric co2 is combustion of fossil fuels. Another significant contributor to co2 increase is ____________.
Answer:
it is deforestation
Explanation:
Question 3 (1 point)
Electrochemical processes involve redox reactions because electrons are transferred.
O True
O False
Question 4 (1 point)
The activity series of metals helps determine the result of chemical reactions.
O True
O False
An electrochemical process involves any process that has to do with the transfer of elecrons.
What is an elecrochemical process?An electrochemical process involves any process that has to do with the transfer of elecrons. These process include redo reactionand electron transport chains.
It is a true statement that the actiivity series helps to detect the products in a reaction because a metal that is lower in the series is always displaced by a metal that is higher in the series.
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Two atoms interact with each other and change as shown by the equation Complete the equation by filling in the missing parts.
Answer: the missing parts are ³₂He
Explanation:
The equation shown represents a nuclear reaction, meaning that, instead of the two hydrogen atoms form a molecule by a chemcial bond between the electrons of the atoms, the nuclei of the two interacting atoms change, leading to a new kind of atoms and particles.
That is mainly indicated by the appearace of the particle ¹₀ n, which is the symbol for a neutron. The superscript 1 to the left of the symbol (letter n) means that the mass number of the neutron is 1, and the subscript 0 to the left of the symbol means that the atomic number of neutron is 0.
To determine the symbol, superscript and subscript needed to complete the missing parts of the equation, you need to do a mass number and atomic number balance.
Mass number balance:
The mass number is the superscript to the left of the symbol of the atom.
Each hydrgogen atom, in the reactant side, contributes a mass number 2, and the neutron on the product side contributes a mass number 1, so the balance is:
2 + 2 = x + 1,
from which you determine that the unknown mass number is x = 4 - 1 = 3.
Atomic number balance
The atomic number is the subscript to the left of the element.
Each hdyrogen atom contributes an atomic number 1, and the neutron contributes 0 atomic number. So, the atomic number balance is:
1 + 1 = x + 0 ⇒ x = 2.
Hence, the unknown atomic number is 2.
Conclusions:
The atomic number of the unknown element is 2, meaning that it has 2 protons.
In a periodic table you find that the element with atomic number 2 is helium, whose symbol is He.
The mass number of this atom of helium is 3, which implies that it has 3 - 2 = 1 neutron.
Using the corresponding notation, the complete equation is:
²₁ H + ²₁ H → ³₂He + ¹₀ p
hope this helps
In a chemical reaction, when particle size is reduced, the rate of reaction increases because of increased surface area of the
reactants.
Why would increased surface area increase reaction rate?
-0)
A)
It increases the number of collisions among particles.
B)
It decreases the activation energy.
It increases the concentration.
D)
It decreases the temperature.
Answer:
option A
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An increased surface area would increase the reaction rate because it increases the number of collisions among particles.
What is rate of a reaction?Rate of a reaction is the speed or length of time it takes for a reaction to take place.
The rate of a chemical reaction can be affected by the following:
Increase in surface area of reactantsIncrease in temperatureAccording to this question, when particle size is reduced, the rate of reaction increases because of increased surface area of the reactants.
This is because the increase in surface area increases the number of collisions among particle.
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10 grams CH10 + excess O2 → ? grams CO2 + H2O
Answer:
20 gm CO2
Explanation:
CH10 mole weight = ~ 22 gm
each 22 gm CH10 produces 44 gm CO2
44 / 22 = x / 10 = 20 gm
When different elements react, their atoms join with other atoms.
What type of substance is formed?
Answer:
compound is formed .............
When different elements react, their atoms join with other atoms. A substance that is formed is called a compound.
What are elements?An element is a variety of atoms that consists of a pure substance as well as a proper amount of proton atoms embedded in their nucleus.
In the field of chemistry, a mixture is a concoction of two or more unrelated chemical constituents. A mixture is a physical combination of two or more components in which their distinct identities are maintained. Solutions, suspensions, and colloids can all be considered to be mixtures.
Compounds are groups of two or more distinct elements that are chemically bonded together. Chemical bonds hold the compound together. A compound cannot be physically separated from another compound, and it cannot be determined whether a compound is present in a combination.
Thus, a compound will be formed by the joining of atoms.
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Gaseous xenon difluoride reacts with liquid water to make xenon gas, gaseous
hydrogen fluoride, and oxygen gas. If 4.50 g of water reacts with 67.72 g of xenon
difluoride in a sealed 2L container at 25 °C calculate the individual partial pressure all
of the gasses present after the reaction has reached completion (assume the reaction
goes to completion).
Please help me!
The inidividual partial pressure of all gases present afer reaction i.e. Xe₂, HF & O₂ is 1.52atm, 6.1 atm and 1.52 atm respectively.
How do we calculate partial pressure?Partial pressure of each gas involved in the chemical reaction will be calculated by using the ideal gas equation with each moles seprately, as:
PV = nRT, where
P = partial pressure = ?
V = volume = 2L
n = moles of gases
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 25°C = 298.15 K
Given balanced chemical reaction is:
2XeF₂(g) + 2H₂O(l) → Xe₂(g) + 4HF(g) + O₂(g)
Moles from mass will be calculated as:
n = W/M, where
W = given mass
M = molar mass
Moles of XeF₂ = 67.72g / 169.3g/mol = 0.4 mol
Moles of H₂O = 4.50g / 18g/mol = 0.25 mol
From the calculation it is clear that water is the limiting reagent so the formation of products will depends on water. From the stoichiometry of the reaction it is clear that:
0.25 moles of H₂O = produces 0.25/2 = 0.125 moles of Xe₂
0.25 moles of H₂O = produces 0.25(4/2) = 0.5 moles of HF
0.25 moles of H₂O = produces 0.25/2 = 0.125 moles of O₂
So partial pressure of oxygen and xenon gas will be same as they have same number of moles and it will be calculated as:
P = (0.125)(0.082)(298.15) / (2) = 1.52 atm
Partial pressure of HF gas will be calculated as:
P = (0.5)(0.082)(298.15) / (2) = 6.1 atm
Hence partial pressure of Xe₂, HF & O₂ is 1.52atm, 6.1 atm and 1.52 atm respectively.
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If the pressure of the gas is doubled while the volume is held constant, what happens to its temperature?.
Answer:
The temperature will increase or doubled.
Explanation:
In Amonton's Law, it states the pressure of a given amount of gas is directly proportional to its temperature on Kelvin scale when the volume is held constant.
Which base has the smallest base dissociation constant?
A. calcium hydroxide
B. ammonia
C. potassium hydroxide
D. sodium hydroxide
Answer:
D. ammonia, because the other three are the only three strong bases in the world (we do not need to memorize base dissociation constant for the test, we just need to know the three strong bases)
Explanation:
q u i z l e t
How long are peeled potatoes good for in the fridge?.
Answer:
24 hours
Explanation:
You can safely leave peeled potatoes in the refrigerator for 24 hours. It's a great way to get a head start on your holiday meal preparation. As the Idaho Potato Commission notes, you can keep both whole, peeled potatoes or cut potatoes in the refrigerator.
Somebody please help me with this problem!!
Explanation:
I guess since it has greater number on ions it won't react as heavily as the others, I'm going based off of atoms.
A student is planning an investigation to explore different properties of matter.
Which investigation will help the student explore a physical property of matter?
Answer:
Looking for certain physical properties.
Explanation:
These properties include color, size, mass, luster, etc.
Weighing the item is a common way to find one physical property, mass.
When discussing solutions, the amount of solute dissolved in the solvent is important to know
as it will affect the Colligative Properties of that solution. A solution prepared by dissolving
the maximum amount of solute in a given amount of solvent is BEST described as:
A) a supersaturated solution.
B) a saturated solution.
C) an unsaturated solution
D) a dilute solution.
Answer: B
Explanation:
What are the 5 countries that produce the most of coal of power?
Answer:
I know Russia is or was one of them China, India, US, Australia and Indonesia I know they provide coal
Explanation:
Russia is One of the largest oil provider similar to coal
CH3OH is chemical name of ?
CH3OH is chemical name of 'methanol'
☆...hope this helps...☆
_♡_mashi_♡_
if the theoretical yield is 27.71 g and the actual yield is 20.02 g what is the yield?
What is the most significant intermolecular force between water molecules?.
Answer:
cohesive force
Explanation:
Where and when are acute-phase proteins produced?
Primarily in mucus in response to defensin production
Primarily in the lungs in response to decreased respiratory rates
Primarily in the liver in response to inflammation
Primarily in the plasma in response to an increase in acidity
Answer:
The answer should be C. Primarily in the liver in response to inflammation :)
Have an amazing day!!
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The Asian long-homed beetle can infect a variety of tress such as maple trees and elm trees. These beetles eat the inside of an
infected tree and destroy the pathways that water and nutrients travel through to get from the roots to the rest of the tree. This results
in the tree becoming sick and eventually dying.
A cargo ship canying Asian long-homed beetles introduces the species into a region where the beetles were not previously present
This region has a diverse population of maple and elm trees. How will humans in the area likely be impacted?
OA. The housing industry will be negatively impacted due to an increase in lumber costs.
OB. The maple syrup industry will be negatively impacted due to a decrease in the maple population
OC. The lumber industry will be negatively impacted due to a decrease in available resources.
OD. all of
Answer: The answer to your question is OD
Hope this helps.
Answer:
The answer is D, all of these.
Explanation:
The person above was right ^^
A hypothesis is best written as ?
Answer:
A good experimental hypothesis can be written as an if, then statement to establish cause and effect on the variables. If you make a change to the independent variable, then the dependent variable will respond
An aqueous solution has a hydroxide ion concentration of 1.20 × 10–2 M at 25°C. Calculate the pOH of the solution.
Let's see
25°C is normal room temperature denotionpOH
[tex]\\ \rm\Rrightarrow -log[OH^-][/tex]
[tex]\\ \rm\Rrightarrow -log[1.2\times 10^{-2}][/tex]
log(ab)=loga+logb[tex]\\ \rm\Rrightarrow -log1.2-log10^{-2}[/tex]
[tex]\\ \rm\Rrightarrow -0.0791812460476+2[/tex]
[tex]\\ \rm\Rrightarrow 2.0791812460476[/tex]
Approximately 2a doctor orders an MRI scan at 8.5x10^7 and a CT scan at 1.69x10^19 Hz. At what wavelength do the MRI and CT scans operate
CT scans operate on the wavelength of 0.01–0.1 nm whereas the signals of MRI ranges from 1MHz to 300MHz,
What wavelengths do MRI and CT scans use?The CT scan device used the X-rays that have a wavelength of 0.01–0.1 nm. These wavelengths are longer than gamma rays but shorter than ultraviolet rays.
So we can conclude that CT scans operate on the wavelength of 0.01–0.1 nm whereas the signals of MRI ranges from 1MHz to 300MHz.
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A solid substance turns directly into a gas. Which term describes this change?
deposition
evaporation
melting
sublimation
Answer:
sublimation
Explanation:
Deposition is like dew forming
evaporation is going from liquid to gas
melting is going form solid to liquid ( like ice does when it warms)
sublimation is going from solid directly to gas ( like moth balls)
A balloon is filled with 100.0 Lair at 1.300 atm pressure. what pressure is needed to change the volume to 25.00 L
Answer:
4 atmospheric pressure is needed to get a volume of 25 litres
A sample of methane occupies 3. 0 L at 200. C and 1. 4 ATM. What is the volume of the gas at STP?
Answer:
2.42 liters
Explanation:
P1V1/T1 = P2V2/T2 T 'S are in K
STP is 273.15 K and 1 atm
1.4(3) / 473.15 = (1) ( V) /273.15
V = 2.42 liters
The combustion of propane (C3H8) produces CO₂ and H₂O:
C₂H8 (g) +5O₂ (g) → CO₂ (g) + 4H₂O(g)
The reaction of 5.5 mol of O₂ will produce ____ mol of H2O
Answer:
4.4 moles of water
Explanation:
Propane is C3H8. Is the chemical equation, you wrote C2H8 which is wrong. Type everything properly and give a check before finally posting the question.
The chemical equation that is given, is not properly balanced. The BALANCED equation would be
C3H8 + 5O2 → 3CO2 + 4H2O
From this balanced chemical equation, we see that 5 moles of oxygen produce 4 moles of water.
5 moles of Oxygen → 4 moles of water
1mole of oxygen → [tex]\frac{4}{5}[/tex] moles of water
5.5 moles of oxygen → ([tex]\frac{4}{5}[/tex] × 5.5) moles of water = 4.4 moles of water
∴ The reaction of 5.5 mol of O2 will produce 4.4 mol of H2O. [Answer:]
Answer:
5.5
Explanation:
First, you will need to balance the equation ( the equation in your question is not balanced....typo?)
C2 H8 + 4 O2 ===> 2 CO2 + 4 H2O
Now, from the balanced equation:
O2 : H2O = 4/4 = 1/1
SO 5.5 MOLES OF O2 PRODUCES 5.5 MOLES H20
Given 2.3 moles of TiO2, how many grams of Na2O can i produce
a gas has a volume of 2.00 at 323k and 3.00 ATM What would be the new volume if the temperature is changed to 273 K in the pressure is changed to 1ATM
Answer:
[tex]V_2 = 5.07L[/tex]
Explanation:
[tex]\frac{P_1 V_1}{T_1} = \frac{P_2 V_2}{T_2}\\V_2 = \frac{P_1 V_1 T_2}{T_1 P_2} = \frac{3.00atm \cdot 2.00L \cdot 273K}{323K \cdot 1.00atm} = 5.07L[/tex]
Apply combine gas law
[tex]\\ \rm\Rrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\\ \rm\Rrightarrow \dfrac{3(2)}{323}=\dfrav{V_2}{273}[/tex]
[tex]\\ \rm\Rrightarrow 6(273)=323V_2[/tex]
[tex]\\ \rm\Rrightarrow 1638=323V_2[/tex]
[tex]\\ \rm\Rrightarrow V_2=5.07L[/tex]
Ba(C204) + K(IO3) = Ba(IO3)2 + K2(C2O4)
Explanation:Reaction Type
Double Displacement (Metathesis)
Net Ionic Equation
Ba(C2O4) + 2K(IO3) = Ba(IO3)2 + K2(C2O4) might be an ionic equation. Calculate the net ionic equation for Ba(C2O4)(s) + 2K(IO3)(aq) = Ba(IO3)2(aq) + K2(C2O4)(aq).
If the mass of the electron were magically doubled, would the ionization energy of hydrogen increase, decrease, or stay the same?.
Answer:
The ionization energy would increase
Explanation:
because the increased mass would mean the electron would orbit closer to the nucleus and would require more energy