PLEASE HELP !!!
Which of the following measurements is used to measure the enthalpy of combustion?
A. Measuring the change in temperature when two liquids are mixed.
B. None of these
C. Measuring the change in temperature of a beaker of water.
D. It cannot be measured, only calculated using the equation: q = mc∆T.
Explanation:
measuring the change of temperature when 2 liquids are mixed
Which of the following emits a beta particle?
alpha particle
nucleus
hydrogen atoms
photoelectrons
Which electron in an atom (Z=17) is the most shielded from
nuclear charge?
A. an electron in the 2s
B. an electron in the 3p
C. an electron in the 3d
D. an electron in the 1s
Answer:
option no. C is correct
an electron in the 3d
Which mathematical statement shows the formula for weight?
Answer
(:
Weight is basically a measure of theme force of gravity pulling down on an object. It depends on the object's mass and the acceleration due to gravity, which is 9.8 m/s2 on Earth. The formula for calculating weight is F = m × 9.8 m/s2, where F is the object's weight in Newtons (N) and m is the object's mass in kilograms.
Explanation:
PLEASEEEE HELPPPP!!!
What is a spontaneous change?
A. One that has an ordered arrangement of particles.
B. One that occurs on its own.
C. One that has a random arrangement of particles.
D. One that occurs when one specific event happens.
Answer:
B.
Explanation:
A spotaneous change is one which occurs on its own
A spontaneous change is one that occurs on its own.
What is a Spontaneous Process ?A spontaneous process is a process which has a natural tendency to occur in one direction , It has no relation with the speed , It can be fast or it can be slow but it doesn't require any external factors to happen.
such reactions might not face change in energy but it will see change in the way the matter or energy is distributed
The example of a spontaneous reaction is the decay of radioactive elements.
Example of Spontaneous Process is also water flowing downhill, it has the natural tendency to flow in that direction.
A spontaneous change is one that occurs on its own.
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PLEASE HELP : Arrange the following elements into a food chain: plants, snake, Sun, hawk, and mouse.
Answer:
Plants ➯ Mouse ➯ Snake ➯ Hawk ➯ Sun
Explanation:
In Order As A Food Chain
The elements are arranged into food chain like plants ⇒Mouse ⇒ Snake⇒ Hawk ⇒ Sun.
What is element?A substance that could not be further decomposed according to any chemical reaction is known as a chemical element.
What is food chain?
The flow of nutrients as well as energy through such an ecosystem is described by a food chain. Energy is first produced by plants at the most fundamental level, and then it is used by higher-level species like herbivores. Energy is then transmitted from one carnivore to the next when they eat the herbivores.
The elements are arranged into food chain like plants ⇒Mouse ⇒ Snake⇒ Hawk ⇒ Sun.
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URGENT !!!
Which of the following pairs lists a substance that can neutralize Ca(OH)2 and the salt that would be produced from the reaction? (3 points)
HCl and CaCl2
HClO and CaHClO
H2O and Ca(OH)3
H3PO4 and Ca(PO3)2
HCl and CaCl2
I took the test and it wright
The correct pair that lists a substance that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt that would be produced from the reaction is HCl and [tex]\rm CaCl_2[/tex].
A reaction is a process that involves the transformation of one or more substances into one or more different substances.
When HCl (hydrochloric acid) reacts with [tex]\rm Ca(OH)_2[/tex] (calcium hydroxide), they undergo a neutralization reaction. The HCl donates a hydrogen ion ([tex]\rm H^+[/tex]) to the [tex]\rm Ca(OH)_2[/tex], resulting in the formation of water ([tex]\rm H_2O[/tex]) and [tex]\rm CaCl_2[/tex] (calcium chloride).
The reaction can be represented as follows:
[tex]\rm 2HCl + Ca(OH)_2\rightarrow 2H_2O + CaCl_2[/tex]
Therefore, HCl is an acid that can neutralize [tex]\rm Ca(OH)_2[/tex] and the salt produced from this reaction is [tex]\rm CaCl_2[/tex].
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if you have 5.42 x 1024 aluminum atoms, approximately how many moles is that
Answer:
It is approximately 9 moles
Explanation:
Divide the aluminum atoms by Avogadro's number
(5.42*10^24)/(6.02*10^23)
= approx. 9 moles
Is soup pure or impure?
Answer:
I think it's impure . Hope this helps you
Answer:
I think is pure but not 100% pure.
list three common examples of solute
Answer:
sugar, salt, oxygen
Explanation:
hope these work
Answer:
Examples of solutes include sugar, salt, oxygen, etc. There are numerous examples of solutions. For example, milk (solvent) and sugar (solute) make sweet milk. Air is made up of gases (oxygen, nitrogen, carbon dioxide, etc.).
Explanation:
What element has 16 electrons, 16 protons, and 16 neutrons
Answer:
The element that has 16 electrons, 16 protons, and 16 neutrons is sulfur (S)
Explanation:
The atomic number tell you the number of protons.
The atomic configuration tell you the number of electrons.
The mass number minus the protons tell you the number of neutrons.
How would it have been if particles of matter had no space?
Answer:
Matter is made of small particles of atoms or molecules. ... The particles in the solid are touching with very little space between them. The particles in a liquid usually are still touching but there are some spaces between them. The gas particles have big distances between them.
Explain how to convert a mass of compound A to a mass of compound D in words using the following reaction:
2A + 4B = C + 3D
You don't have to just give me the answer but if you can help me understand id appreciate it greatly
Answer:
1. Convert the mass of A to moles dividing in molar mass
2. Convert the moles of A to moles of D (2mol A = 3mol D)
3. Convert the moles of D to mass multiplying by its molar mass
Explanation:
As you can see in the equation, 2moles of A produce 3 moles of D, the equation is:
2mol A = 3mol D
But in the problem you are having the mass of A and you need the mass of D. That means you require to convert the mass of A to moles. With the moles of A you can find the moles of D and, as last, you need to convert the moles of A to mass.
To convert mass to moles or vice versa you must use Molar Mass. That means, the answer is:
1. Convert the mass of A to moles dividing in molar mass2. Convert the moles of A to moles of D (2mol A = 3mol D)3. Convert the moles of D to mass multiplying by its molar massHow many total atoms are there in 60.3 g of carbon monoxide (CO)?
total atoms:
atoms
Explanation:
moles = mass/mr
=60.3/28
=2.15 moles
number of particles = moles × 6.02×10^23
= 2.15×6.02×10^23
= 1.29×10^24 atoms
CO=12+16=28
When the pH of a solution is changed from 4 to 3, the hydronium ion concentration of the
solution
A)
increases by a factor of 10
B)
decreases by a factor of 100
C)
increases by a factor of 100
D)
decreases by a factor of 10
Answer:increases by a factor of 10
Explanation: the concentration of the solution changed from 4 to 3
What is the empirical formula of a compound containing 5.03 g carbon, 0.42 g hydrogen, and 44.5 g of chlorine
Answer:
CHCl₃
Explanation:
We have the following data:
C = 5.03 g
H = 0.42 g
Cl= 44.5 g
First, we divide each mass by the molar mass (MM) of the chemical element to calculate the moles:
MM(C) = 12 g/mol
moles of C = mass/MM(C) = 5.03 g/(12 g/mol) = 0.42 mol C
MM(H) = 1 g/mol
moles of H = mass/MM(H) = 0.42 g/(1 g/mol) = 0.42 mol H
MM(Cl) = 35.4 g/mol
moles of Cl = mass/MM(Cl) = 44.5 g/(35.4 g/mol) = 1.26 mol Cl
Now, we divide the moles by the smallest number of moles (0.42):
0.42 mol C/0.42 = 1 C
0.42 mol H/0.42 = 1 H
1.26 mol Cl/0.42 = 3 Cl
Thus, the C:H:Cl ratio is 1:1:3.
Therefore, the empirical formula is CHCl₃
Answer:
CHCl₃
Explanation:
.A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into aconical flask.A burette is filled with dilute sulfuric acid. Write a balanced symbol equation for the reaction between these chemicals when we neutralise.
Answer:
A volumetric pipette is used to measure 25.0cm3 of 2.0mol/dm3 aqueous sodium hydroxide into aconical flask.
A burette is filled with dilute sulfuric acid.
Write a balanced symbol equation for the reaction between these chemicals when we neutralise.
Explanation:
The reactants of the given reaction are:
sodium hydroxide and dilute sulfuric acid.
The balanced chemical equation of the reaction is:
[tex]H_{2}SO_{4} (aq) + 2NaOH(aq) -> Na_{2} SO_{4} (aq)+ 2H_{2} O(l)[/tex]
Acid and base raect with each other and form salt and water.
This reaction is called a neutralization reaction.
What is the standard reduction potential, e, for the half-reaction Zn2+(aq) +2e → Zn(s)?
A. -0.76 V
B. -1.68 V
C. -2.37 v
D. -2.71 V
The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V; option A
What is standard reduction potential?
The standard reduction potential of a chemical species is the a measure of the potential of a given chemical species to be reduced rather than being oxidized.
This measurement is done under standard conditions of concentration, pressure and temperature.
The standard reduction potential for the half-reaction Zn²⁺(aq) + ⁻2e → Zn(s) is -0.76 V.
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How many moles of aluminum oxide are produced when 6 moles of oxygen gas react?
4Al + 3O2 → 2Al2O3
Answer:
4 moles of aluminum and 6 moles of oxygen are produced
Rank them from the smallest to the largest
electrons
protons
atom
compounds
mixtures
Write a nuclear equation for the beta decay of Promethium-165
Answer:
see your answer in pic
Explanation:
There can be emissions of radiations like gamma radiation. There can be emission of particles too like alpha particle. Therefore, the nuclear equation for the beta decay of Promethium-165 is
¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁ + ₆₂Sm¹⁶⁵
What is nuclear decay?Nuclear decay is process in which the radioactive element releases particles or radiations. Alpha particles is ⁴₂He. Alpha particle is nothing but helium particle. The kinetics that is related to nuclear decay is of first order.
The nuclear equation for the beta decay of Promethium-165 is
¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁ + ₆₂Sm¹⁶⁵
Beta decay of Promethium-165 is the emission of electron particle from the given isotope. the product is Samarium ₆₂Sm¹⁶⁵.
Therefore, the nuclear equation for the beta decay of Promethium-165 is
¹⁶⁵Pm[tex]\rightarrow[/tex]⁰e₋₁ + ₆₂Sm¹⁶⁵
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What is the pH of a solution with [H+] concentration of 1.86 x 10-5?
a.5.37 x 10-10
b.9.3
c.4.7
d.1.86 x 10-5
Answer:
4.7Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ {H}^{+} ][/tex]
From the question we have
[tex]ph = - log(1.8 \times {10}^{ - 5} ) \\ = 4.7447[/tex]
We have the final answer as
4.7Hope this helps you
how many moles are in 3.25188x10^24 molecules of CO2
Answer: C is right
Explanation: One mole is 6.022 x 10^23 molecules.
Dividing 3.25188 x 10^24 / 6.022 x 10^23 = 5.4 moles
ANSWER THE QUESTION TO GET BRAINLIST
When sunlight travels from the vacuum of space into Earth's atmosphere it slowed down slightly. Explain why and name the light principle involved.
It is thought that global dimming is probably due to the increased presence of aerosol particles in Earth's atmosphere, caused by pollution, dust, or volcanic eruptions. Aerosols and other particulates absorb solar energy and reflect sunlight back into space. ... Water droplets in clouds coalesce around the particles.
Global Dimming
source:
wikipedia via gooogle snippet
I para realizar un receta casera de bizcocho se necesitan 100 gramos de azúcar, calcula los moles a los que equivale y el número de moléculas de sacarosa.
The complete question is as follows: I want to make a homemade cake recipe you need 100 grams of sugar, calculate the moles to which it is equivalent and the number of molecules of sucrose.
Answer: In 100 grams of sugar there are 0.292 moles and the number of molecules of sucrose are [tex]1.76 \times 10^{23}[/tex].
Explanation:
Given: Mass = 100 g
Molar mass of sugar = 342.3 g/mol
As number of moles is the mass of substance divided by its molar mass.
Hence, moles of sucrose are calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{100 g}{342.3 g/mol}\\= 0.292 mol[/tex]
According to mole concept, 1 mole of every substance contains [tex]6.022 \times 10^{23}[/tex] molecules.
Hence, the number of molecules present in 0.292 mol are calculated as follows.
[tex]0.292 mol \times 6.022 \times 10^{23}\\= 1.76 \times 10^{23}[/tex]
Thus, we can conclude that in 100 grams of sugar there are 0.292 moles and the number of molecules of sucrose are [tex]1.76 \times 10^{23}[/tex].
2.7 x 10^25 molecules of MnO equals how many moles?
Answer:
27 and 24 zeroes following it
Explanation:
10^25 is 100...(continues for 25 zeroes)
Now we multiply it by 2.7, making it 24 zeroes afterwards.
Avogadro's numbers are used to calculate the number of moles from molecules. There are 44.8 moles in MnO.
What are molecules?Molecules are the unit of the compound that may have the same or different atoms in it. The number of molecules is used to calculate moles from Avogadro's number.
By Avogadros number 1 mole of substance = 6.02 x 10²³ molecules
So, 2.7 x 10²⁵ molecules will have moles:
(2.7 x 10²⁵ molecules × 1 mole) ÷ (6.02 x 10²³ molecules) = 0.448 × 10² moles
Therefore, there are 44.8 moles of MnO.
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Use the activity series below to predict whether the following reactions will take place.
Answer:
first one is yes, second one is no
Explanation:
edge
If a speaker is moved from 2 feet away to 4 feet away, the volume of the sound will: half double quarter stay the same
Answer:
the volume of the sound will quarter
Explanation:
As you move far away from the source, the loudness of sound decreases. This is because as the distance from the source increases, the area it covers also increases thereby spreading the energy over a great area leading to lesser loudness and intensity.
As a result of this, sound intensity follows an inverse square law:
I ∝ 1/d²; where I is the intensity and d is the distance from source.
Therefore If a speaker is moved from 2 feet away to 4 feet away (increment of 2 feet), the volume of the sound would quarter (1/2² = 1/4)
_______ reach the surface first during an earthquake.
Rayleigh waves
P waves
Love waves
S waves
PLEASE SOMEONE! The density of the acetic acid solution is 1.05 g/mL. Calculate the %(m/m) of the acetic acid solution (convert mol/L to %(m/m)).
CH3COOH(aq) + NaOH(aq) = CH3COOHNa(aq) + H2O(L)
Volume of CH3COOH = 0.1L
Titration Equation: CH3COOH(aq) + NaOH(aq) = CH3COOHNa(aq) + H2O(L)
Concentration of CH3COOH = 0.243 mol/L
Answer:
The Percentage concentration of acetic acid = 1.39 %
Explanation:
Density of acetic acid solution = 1.05 g/mL
Volume of acetic acid solution = 0.1 L = 100 mL
From the formula, Density = mass / volume; mass = density × volume
Mass of acetic acid solution = 1.05 g/mL × 100 mL = 105 g
Molar concentration of acetic acid solution = 0.243 mol/L
Molar mass of acetic acid, CH₃COOH = (12 × 2 + 1 ×4 + 16 ×2) = 60 g/mol
From the formula, mass concentration = molar concentration × molar mass
Mass concentration of acetic acid, CH₃COOH = 0.243 mol/L × 60 g/mol = 14.58 g/L
In one liter of acetic acid solution, there are 14.58 g of acetic acid. Therefore, in 0.1 L, there will be 14.58 × 0.1 = 1.458 g of acetic acid.
Percentage concentration of acetic acid = mass of acetic acid / mass of acetic acid solution × 100%
Percentage concentration of acetic acid = (1.458 / 105) × 100% = 1.39 %
The Percentage concentration of acetic acid = 1.39 %