Answer:
All are Endothermic reaction.
Explanation:
Answer:
CH4 + 2O2 --> CO2 + 2H2O + 891 kJ
Explanation:
Edge
urgent helppppppppme
What is the definition of thermal chemistry?
The study of change that involves cool objects
The study of change that involves temperature
The study of change that involves heat
Answer:
the second one
Explanation:
thermal has to do with temperature
How many grams are equal to 413kg ?
Answer:
413000 grams
Explanation:
from model
Why do plants found in the understory have large, wide leaves?
to absorb as much sunlight as possible
to absorb as much water as possible
to absorb as many soil nutrients as possible
to prevent consumers from eating them
Answer:
A. to absorb as much sunlight as possible.
Explanation:
Because they are in the understory, it's a constant competition for sunlight to perform photosynthesis, so they need wider leaves to capture what is filtered by canopy trees.
Answer:to absorb as much sunlight as possible
Explanation:
Rechargeable batteries use a _________________medium to convert electrical current to a form of chemical energy which can be stored for future use.
Rechargeable batteries use a reversible reaction medium to convert electrical current to a form of chemical energy which can be stored for future use.
What is a rechargeable battery?A rechargeable battery is a type of battery that can be charged many times by passing electric current through the cells in a reversible reaction.
How does recahargeable battery store energy?When electrical energy from an outside source is applied to a secondary cell (reachargeable battery), the negative to positive electron flow that occurs during discharge is reversed, and the cell's charge is restored. This process is called reversible reaction.
Thus, rechargeable batteries use a reversible reaction medium to convert electrical current to a form of chemical energy which can be stored for future use.
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Indicate whether the following are signs or symptoms:
Answer:
A fever is a sympton. A headache is a sign. increase pulse rate is a sign. low blood pressure is a sign. feeling of dizzinies is a symptom. stomache is a symptom.
Explanation:
I learned these in class before and they make the most sense.
What are the hazards of sodium chloride
Answer:
Eye: May cause eye irritation. Exposure to solid may cause pain and redness.
Skin: May cause skin irritation. May be harmful if absorbed through the skin.
Ingestion: May cause irritation of the digestive tract. May be harmful if swallowed. Ingestion of large amounts may cause nausea and vomiting, rigidity, or convulsions. Continued exposure can produce coma, dehydration, and internal organ
Inhalation: May cause respiratory tract irritation. May be harmful if inhaled. Chronic: No information found.
Consider the following equation.
H2O(l) + heat ⇌ H2O(g)
Which will occur if the temperature of the system is increased?
With the increase in temperature, the state of matter of water will changed.
What happen if the temperature of the system is increased?If the temperature of water is increased then the state of matter will change from liquid state to gaseous state because the temperature break down the bonds that is present between two water molecules.
So we can conclude that with the increase in temperature, the state of matter of water will changed.
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20 POINTS!!!!!!!! NEED ANSWER ASAP
A container of an ideal gas at 300 Kelvin (K) has a volume of 2.5 liters (L). What is the calculated volume, in L, of the gas if the temperature is changed to 100 K?
0.83
1.2
7.5
120
Answer: 0.83
Explanation:
Describe how to calculate the ocean concentration of CO32- using the data collected from 2015. You do not need to calculate it (only mention what data, constants and equations are needed).
The carbonic acid dissociation constant, ocean pH and the bicarbonate ion concentration are required to to calculate the ocean concentration of the carbonate ion.
What is concentration of a chemical species?The concentration of a chemical species is the amount in moles per given litre of solution.
To calculate the ocean concentration of the carbonate ion, the data needed are:
Total alkalinity The dissociation constant for the carbonic acid andpH bicarbonate ion concentrationThe equation for calculating the carbonate ion concentration is given below:
[tex][CO_3^{2-}] = \frac{K × [HCO_3^{-}]}{H^{+}}[/tex]
Therefore, to calculate the ocean concentration of the carbonate ion, the carbonic acid dissociation constant, ocean pH and the bicarbonate ion concentration are required.
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In the equation below
1. If a sample containing 12.5 moles of NH3 is reacted with excess CuO, how many moles of each product can be made?
N2=
Cu=
H20=
thanks!
Answer:
6.25 moles of N₂ is produced, and 18.8 moles of Cu and H₂O is produced.
Explanation:
We are given the chemical equation:
[tex]\displaystyle 2\text{NH$_3$}_\text{(g)} + 3\text{CuO}_\text{(s)} \longrightarrow \text{N$_2$}_\text{(g)} + 3\text{Cu}_\text{(s)}+3\text{H$_2$O}_\text{(g)}[/tex]
And we want to determine the amount of products produced when 12.5 moles of NH₃ is reacted with excess CuO.
Compute using stoichiometry. From the equation, we can see the following stoichiometric ratios:
The ratio between NH₃ and N₂ is 2:1. (i.e. One mole of N₂ is produced from every two moles of NH₃.)The ratio between NH₃ and Cu is 2:3. The ratio between NH₃ and H₂O is 2:3. (i.e. Three moles of H₂O or Cu is produced frome every two moles of NH₃.)Dimensional Analysis:
The amount of N₂ produced:[tex]\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{1\text{ mol N$_2$}}{2\text{ mol NH$_3$}} = 6.25\text{ mol N$_2$}[/tex]
The amount of Cu produced:[tex]\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{3\text{ mol Cu}}{2\text{ mol NH$_3$}} = 18.8\text{ mol Cu}[/tex]
And the amount of H₂O produced:[tex]\displaystyle 12.5\text{ mol NH$_3$} \cdot \frac{3\text{ mol H$_2$O}}{2\text{ mol NH$_3$}} = 18.8\text{ mol H$_2$O}[/tex]
In conclusion, 6.25 moles of N₂ is produced, and 18.8 moles of Cu and H₂O is produced.
A susbtance has an empirical formula of CrO2 and a molecular weight of 168 g/mol. determine the molecualr formula for this substance
Answer:
[tex]Cr_{2} O_{4}[/tex]
Explanation:
[tex]\frac{molecular weight}{molar mass}[/tex] = [tex]\frac{168}{83.99}[/tex] = 2.00
[tex]CrO_{2}[/tex] x 2 = [tex]Cr_{2} O_{4}[/tex]
What changes occur in the reaction indicated by the equation? check all that apply. the hydrogen nucleus loses protons. the oxygen nucleus gains protons. the bond in h2 is broken, and new bonds are formed between hydrogen and oxygen atoms. each electron associated with a hydrogen atom is shared with an oxygen atom.
The changes occur in reaction are the bond in H₂ is broken, and new bonds are formed between hydrogen and oxygen atoms.
What is hydrogen bond?Hydrogen bond is a type of chemical bond which is formed between the hydrogen atom and more electronegative atom due to high dipole interaction.
Given chemical reaction is:
2H₂ + O₂ → 2H₂O
In the above reaction hydrogen nucleus not loses proton inspite of that it was broken and new bond formation takes place in water.
Despite the fact that oxygen atoms attract electrons from hydrogen atoms, oxygen atoms do not gain electrons.
In the water molecule each electron of both hydrogens is shared with an oxygen atom.
As a result, in the preceding equation, the hydrogen molecule's bond is broken, a new bond is formed, and each hydrogen atom's electron is shared with an oxygen atom.
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Answer:
c and d on edge 2022
Explanation:
What quantum mechanics principle states that electrons are added to atomic orbitals with the same energy so that each orbital is singularly occupied with electrons having the same spin?.
Answer:
hund's rule
Explanation:
states that single electrons with the same spin must occupy each equal-energy orbital before additional electrons with opposite spins can occupy the same orbitals (electrons fill empty orbitals before they pair up).
driving a car over snow covered roads will decrease tire pressure.
Is this Boyle’s Law, Charles Law, Gay-Lussac, or Avogadro’s Law?
Answer:
Gay-Lussac Law
Explanation:
We can eliminate two of the options :
Charles LawAvogadro's LawBoth of these laws do not involve variation in pressure, but only conditions in which they remain constant.
Boyle's Law
States that Pressure inversely varies with volumeMeaning if pressure decreases, volume will increaseMost likely does not apply to this questionGay-Lussac Law
States that pressure directly varies with temperatureHere it mentions : "over snow covered roads"Most likely the answerWhat does the reaction of an acid and a base produce.
Answer:
I believe that'd create neutral, or pure.
Explanation:
Name the following aromatic hydrocarbon
CH3 CH2CH3
Br
A. 1-bromo-2-methyl-3-ethylbenzene
B. 1-bromo-2-ethyl-3-methylbenzene
C. 1-ethyl-2-methyl-3-bromobenzene
nternational Academu of Science
All Riahn
Answer:
B
Explanation:
You prioritize the bromo group and then name the alkyl substituents accordingly (and also in the correct alphabetical order)
B. 1-bromo-2-ethyl-3-methylbenzene is the aromatic hydrocarbon
CH3 CH2CH3Br.
Why are they referred to as fragrant hydrocarbons?Traditionally, benzene-like substances have been called aromatic hydrocarbons due to the fact that they had unique aromas. Today, aromatic compounds include any that incorporate a benzene ring or have the residences we accomplice with this group of compounds.
Aromatic compounds, additionally known as "mono- and polycyclic aromatic hydrocarbons", are natural compounds containing one or extra fragrant earrings. The discern member is benzene. Heteroarenes are carefully related, considering the fact that as a minimum one carbon atom of CH organization is changed through one of the heteroatoms oxygen, nitrogen, or sulfur.
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What is the function of carbohydrates in living organisms? (Please use complete sentences)
Answer:
Introduction. Alongside fat and protein, carbohydrates are one of the three macronutrients in our diet with their main function being to provide energy to the body. They occur in many different forms, like sugars and dietary fibre, and in many different foods, such as whole grains, fruit and vegetables.
Explanation:
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Q4. Explain why the process is called reduction.
Answer:
The process is called reduction because any loss of electrons by one substance must be accompanied by a gain in electrons by something else, oxidation and reduction always occur together.
The following balanced equation shows the formation of ammonia. n2 3h2 right arrow. 2nh3 how many moles of nitrogen are needed to completely convert 6.34 mol of hydrogen? 1.02 mol 2.11 mol 12.68 mol 19.02 mol
The required moles of nitrogen which are needed to completely convert 6.34 moles of hydrogen is 2.11 moles.
What is the stoichiometry?Stoichiometry of any reaction gives idea about the relative amount of reactants and products are present in any chemical reaction in terms of moles.
Given chemical reaction is:
N₂ + 3H₂ → 2NH₃
From the stoichiometry of the reaction:
3 moles of H₂ = reacts with 1 mole of N₂
6.34 moles of H₂ = reacts with 1/3×6.34=2.11 moles of N₂
Hence required moles of nitrogen are 2.11.
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In complete sentences, provide a short explanation (2-3 sentences) as to why the elements are organized as they are within the periodic table.
help please
Answer:
The periodic table is arranged by atomic weight and valence electrons. These variables allowed Mendeleev to place each element in a certain row (called a period) and column (called a group). The table comprises seven rows and 18 columns
Explanation:
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What is the volume, in liters, of 13.5 moles of a gas at STP? (STP = 273.15K, 1 atmosphere)
P
V
=
n
R
T
R = 0.0821
a
t
m
⋅
L
m
o
l
⋅
K
Answer:
302.75 Liters
Explanation:
Given:
P = 1 atm
V = ?
n = 13.5 moles
R = 0.0821 atm x L / mole x K
T = 273.15 K
PV = nRT
(1) (V) = (13.5) (0.0821) (273.15)
V = 302.75 Liters
what is carried by waves
Answer:energy ( sorry if i'm wrong lol)
Explanation:
All waves carry energy. The energy of some waves, such as the energy of earthquakes, can be directly observed. Similarly, the churning of the shore by the water waves and the pulverization of nerve cells due to loud sounds are manifestations of wave energy.
Which property would xenon most likely have? it is stable. it is a solid. it is flammable. it is silver in color.
Answer:
A. It is stable
Explanation:
Ed22
Stability is the property that would xenon most likely to have. Therefore, the correct option is option A.
What is xenon?Chemically speaking, xenon is a gas with the atomic number 54 and the symbol Xe. It is a thick, colourless, and odourless noble gas that is present in minute levels in Earth's atmosphere. It may go through a few chemical reactions, such as the creation of xenon hexafluoroplatinate, which is the initial noble gas combination to be created, despite typically being unreactive.
Flash lamps, arc lamps, and general anaesthetics all employ xenon. The early laser designs utilised xenon flash lamps for pumps and a xenon monomer molecule (Xe2) for the lasing medium in the initial excimer laser design. Stability is the property that would xenon most likely to have.
Therefore, the correct option is option A.
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how many electrons occupy a filled 6s sublevel
Answer:
2 electrons
Explanation:
every s sublevel can only be occupied by 2 electrons so a filled 6s sublevel would have 2 electrons
Based on the kinetic theory, which statement is true? (5 points) Matter consists of only large molecules. Matter is made up of only charged particles. The particles of matter have zero kinetic energy and potential energy. The particles of matter are arranged in different ways for the different states.
Answer:
The particles of matter are arranged in different ways for the different states.Explanation:
Matter can be made up of small/large molecules or even atomsMatter is also made up of non-charged particles (neutrons)Particles of matter possess kinetic and potential energyMatter is arranged in different ways for different states (solid, liquid, gas, plasma, etc.)
5. The Half-life of cobalt-60 is 5 years. What fraction of a sample remains after 20 years?
a.One half
b. One quarter
c.One eighth
d. One sixteenth
Can y’all answer this Plss!! 100 points
Refer to the attachment
V1=0.271L=271mLApply Boyles law
[tex]\boxed{\sf {P\propto \dfrac{1}{V}\atop \implies \dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}}}[/tex]
So
0.92/0.55=473.218/V1V1=472.218(0.55)/0.92V1=0.271LWhat volume of 1. 50m nacl contains 3. 40 moles of nacl?.
Let the volume be V
Molarity=Moles of solute/Volume of solution in LPut values
1.50M=3.4/VV=3.4/1.5V=2.267LPredict what happens to air movement when atmospheric pressure is 760 mm Hg, intrapulmonary pressure is 758 mm Hg, and intrapleural pressure is 754 mm Hg.
Because the atmosphere has a pressure difference of 2 mmHg from the lungs, air will migrate into the lungs to maintain equilibrium.
What happens to air movement when atmospheric pressure is 760 mm Hg, intrapulmonary pressure is 758 mm Hg, and intrapleural pressure is 754 mm Hg.?Generally, pressure is simply defined as the force exerted on an item.
In conclusion,if the above parameters where to occur, we would see air flows from a higher-pressure location to a lower-pressure area.
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