Which is best represented by the equation?
2Mg + O2 eq190715_s1 2MgO
A.
Law of Conservation of Energy
B.
Law of Conservation of Mass
C.
Law of Superposition
Answer:
B - Law of Conservation of Mass
Explanation:
was the right answer for me
Complete the word equation for the neutralisation reaction: sodium hydroxide + __________ → sodium chloride + water
Answer:
Hydrochloric Acid
Explanation:
NaOH + HCl = NaCl +H2O
In a Neutralization reaction a base (NaOH) and an acid (HCl) react together to form neutral products. H2O is always a product and a salt is also produced such as KCl or in this case NaCl.
The Na switches with the H to form NaCl.
and the 2 H and the O create H2O.
The neutralization reaction for this is Sodium Hydroxide + Hydrochloric acid → Sodium Chloride + Water.
What is Neutralization Reaction?Neutralization is a type of chemical reaction in which an acid and a base react with each other. In this reaction, neutralization results in the formation of any type of salt and water.
The proton ([tex]H^+[/tex]) from the acid combines with the hydroxide ([tex]OH^-[/tex]) from the base to make water [tex](H_2O)[/tex]. This type of reaction is known as neutralization reaction because it neutralizes the acid and base. If a strong acid and strong base react completely, then the resulting solution will have a pH of 7 (neutral).
For above given example,
Sodium Hydroxide is reacted with Hydrochloric acid to form Sodium Chloride and Water.
Thus, the neutralization reaction for this is Sodium Hydroxide + Hydrochloric acid → Sodium Chloride + Water.
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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:
Which group of elements is not usually reactive with any other elements?.
Answer: Nobel Gasses
Explanation:
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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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!!
Please rate and mark brainliest!!
I will give an brainlist and a lot of points of who ever does this correctly.
Answer:
active energy
*Energy associated with something moving or changing in some way
potential energy
potential energy *stored energy that depends upon the relative position of various parts of a system
similarities between active and potential energy
*they can both be converted into each other's form of energy
1. 5.8g of lithium bromide is dissolved in water to make a 270 L solution. Express the concentration in ppm.
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.
What is the percentage of oxygen in air?
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]
Can someone please help me? :(
Answer:
I would say D.
to get a higher pressure under water you need to go lower
:)
CH3OH is chemical name of ?
CH3OH is chemical name of 'methanol'
☆...hope this helps...☆
_♡_mashi_♡_
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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a 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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What is true of a sample of gas particles as the temperature decreases? (3 points)
The particles move faster, and their average kinetic energy decreases.
The particles move faster, and their average kinetic energy increases.
The particles move slower, and their average kinetic energy decreases.
The particles move slower, and their average kinetic energy increases.
B. The particles move faster, and their average kinetic energy increases.
Hope this helps :))
The sample of gas particles as the temperature decreases particles move slower, and their average kinetic energy decreases. option C is correct.
What are gas particles?
Every matter in this universe consist of small particles and gas also have small particles which are spherical in shape and collide with each other to move in zig zag form.
As temperature decreases the particles will move slow because of low energy as temperature is the source of energy for them and the collision between them also decreases due to which kinetic energy will also decreases.
On increasing the temperature the gas molecules move fast and kinetic energy will also be more.
Therefore, sample of gas particles as the temperature decreases particles move slower, and their average kinetic energy decreases. option C is correct.
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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 statement best describes the relationship between kinetic energy, mechanical energy, and potential energy?
A.
Kinetic energy is part of mechanical energy, but potential energy is not.
B.
Kinetic energy is part of potential energy, but mechanical energy is not.
C.
Kinetic energy and potential energy are the two kinds of mechanical energy.
D.
Kinetic energy and mechanical energy are the two kinds of potential energy.
Answer:
C
Explanation:
because kinetic and potential are both parts of mechanical energy
you should know we learned it in class
There is enough food for about 150 wolves in Yellowstone National Park. This is the __________ of wolves in the park
Carrying Capacity
Explanation:Carrying capacity is defined as the number of organisms that can survive in an environment based on the supplies in the area.
Carrying Capacity Limits
There are multiple variables that can affect carrying capacity. Some of the most common ones are food, water, and space. There is a limited amount of all of these things, which means that the environment can only support a specific amount of organisms. In this case, there is enough food for 150 wolves; thus the carrying capacity is 150.
Changes in Carrying Capacity
Carrying capacity can change throughout time. If the amount of food, water, or space increases, then the carrying capacity will as well. The opposite is also true. So, if suddenly there was enough food for 200 wolves, the carrying capacity would become 200.
How many unique c13 nmr signals exist in the spectrum for the compound?.
Answer:
NMR (Nuclear magnetic resonance) is modern spectroscopy technique to study a variety of nuclei for e.g. 1H NMR, 2H NMR, 13C NMR, 15N NMR, 19F NMR etc
When any nuclei is place in any external magnetic field it starts spinning according to flamings right hand rule & the angular frequency of nuclei is called as Larmor Frequency (ω), and the charged nuclie generates oscillating electric field . There are two energy states Alpha state and Beta state depending on the alignment of spinning nuclie.
If radiowave of frequency (ω) is supplied to the operation the two electric field couples and energy gets absorbed by the nucleus this process is known Resonance.
Depending on the environment of all protons, not all protons absorbs the same amount of energy and the protons are shielded by electrons from the external magnetic field.
Tetramethylsilane (TMS) is used for 1H and 13C NMR, have the delta shift value of 0 PPM
[tex] \sf \: \delta \: shift = \frac{shift \: from \: TMS \: in \: Hz}{spectrometer \: frequency \: in\: MHz} [/tex]
The number of signals of any compound depends on the chemical shift, at every specific shift NMR shows a signal.
Let's understand step by step:
Consider the simplest organic molecule in Organic chemistry methane, methane have only one carbon atom hence it shows only One 13C NMR signal.
Let's move to ethane, ethane have two carbon atoms but the environment of both carbon atom are same that they are terminal carbon bounded to 3 H atoms each. since the chemical environment of both the Carbon atom is same it will again show only One 13C NMR signal.
Now coming to propane, propane have three carbon atoms, two on terminal (methyl groups) and one that is in middle touching both the carbon atoms, the Chemical environment of terminal two carbons are same so they both together will show one peak and the middle carbon(-CH2 group) have different environment so it will show the signal at different shift. Hence the total number of 13C NMR signal would be two!
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What is the volume of a 4M solution with that has 17.2 moles?
Answer: 4.3 L
Explanation:
molarity = (moles of solute)/(liters of solution)
4 = 17.2 / liters of solution
volume = 17.2/4 = 4.3 L
When the heat moves from one place to another by the tendency of density, therma
energy is transferred by the process of
O convection
O radiation
O conduction
O evaporation
Answer:
The answer is A. Convection
Explanation:
Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity (see buoyancy). When the cause of the convection is unspecified, convection due to the effects of thermal expansion and buoyancy can be assumed. Convection may also take place in soft solids or mixtures where particles can flow.
giving 30 points!! please help <3
Answer:
below :)
Explanation:
Bones, droppings, and other dead matter
Energy storage molecules, cellular respiration
Process, energy
Oxygen, energy storage molecules, energy, carbon dioxide
Cellular respiration, carbon
Carbon, nitrogen
Nitrogen
Decomposers, ecosystem
Potassium carbonate (K2CO3) has one potassium atom bonded to carbon, and that carbon is also bonded to three oxygens. Their electronegativities are shown in the list:
K 0.82
C 2.55
O 3.44
How would you describe the bonds (K-C and C-O) in this molecule?
A: K-C is polar covalent, and C-O is nonpolar covalent.
B: K-C is ionic, and C-O is nonpolar covalent.
C: K-C is ionic, and C-O is polar covalent.
D: K-C is polar covalent, and C-O is polar covalent.
Answer:
I'm not all the way sure but I think it is C
Explanation:
The reason is because an ionic bond essentially donates an electron to the other atom participating in the bond. Also, the C-O I think is polar since it is evenly distributed.
Based on the electronegativity difference between them, K-C is ionic, and C-O is polar covalent.
What is a bond?A bond is formed by the interaction of two atoms. A bond can be either ionic or covalent.
Now we have to look at the electronegatives on each bond. The electronegativity difference between the K-C bond is larger than that between the C-O bond hence, K-C is ionic, and C-O is polar covalent.
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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.
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
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
Where are the halogens located on the periodic table.
Answer:
The seventh group
Explanation:
The halogens consist of the elements: F, Cl, Br, I, At, and Ts
What is the general formula for a secondary amine? rnh2 h2nrnh2 rn2h r2nh
The general fomula of the amine group ought to be R2NH because, the two hydrogen atoms of ammonia have been substituted by alkyl groups.
What is a secondary amine?A secondary amine is one in which two alkyl groups are subtituted on the nitrohen atom of ammonia.
This implies that the general fomula of the amine group ought to be R2NH. This is because, the two hydrogen atoms of ammonia have been substituted by alkyl groups.
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Answer:
D
Explanation:
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