b. A reaction occurs between the vinegar and the
alkaline sting. What is this reaction called?
What is the subscript of Carbon? 6 CaCO3
Answer:
subscript is 3
Explanation:
the subscript is the number that is slightly lower than a # which in this case it's O
this indicates that there's 3 oxygen atoms
Answer:
the answer is 1 ♀️
Explanation:
what is the best definition of energy?
A. The capacity to measure heat.
B. The capacity to measure mass
C. The capacity to exert strength
D. The capacity to do work
Answer:
D. the capacity to do work
Explanation:
the basic definition of energy is the ability to do work
What is the mole fraction of NaOH in an aqueous solution that
contains 22.9% NaOH by mass?
Na=23
O=16
H= 1.01
Answer:
The mole fraction of NaOH in an aqueous solution that contain 22.9% NaOH by mass=0.882
Explanation:
We are given that
Aqueous solution that contains 22.9% NaOH by mass means
22.9 g NaOH in 100 g solution.
Mass of NaOH(WB)=22.9 g
Mass of water =100-22.9=77.1
Na=23
O=16
H=1.01
Molar mass of NaOH(MB)=23+16+1.01=40.01
Number of moles =[tex]\frac{Given\;mass}{Molar\;mass}[/tex]
Using the formula
Number of moles of NaOH[tex](n_B)=\frac{W_B}{M_B}=\frac{22.9}{40.01}[/tex]
[tex]n_B=0.572moles[/tex]
Molar mass of water=16+2(1.01)=18.02g
Number of moles of water[tex](n_A)=\frac{77.1}{18.02}[/tex]
[tex]n_A=4.279 moles[/tex]
Now, mole fraction of NaOH
=[tex]\frac{n_B}{n_B+n_A}[/tex]
[tex]=\frac{4.279}{0.572+4.279}[/tex]
=0.882
Hence, the mole fraction of NaOH in an aqueous solution that contain 22.9% NaOH by mass=0.882
What element is produced when Mercury - 204 undergoes alpha decay?
Answer:
bismuth
Explanation:
i think if not i am so sorry
what is electroplating? write complete process of electro plating with the example
Answer:
Electroplating is the process of applying a metal coating on another piece of metal (or another conductive surface) through an electro-deposition process. In electroplating, the deposited metal becomes part of the existing product with the plating/coating.
Explanation:
To understand the concept further, let’s take an example of a gold coating. In this instance, a layer of gold is to be electrodeposited on metallic jewellery to enhance its appearance.Usually, the gold plating is connected to the anode (+ve charged electrode) of the circuit and the jewellery is kept at the cathode (-ve charged electrode). Both are kept immersed in a highly developed electrolytic bat (solution). At this stage, a DC current is supplied to the anode that oxidizes the gold atoms and dissolves them into the solution.The dissolved ions of gold are reduced at the cathode and plated on the jewellery.However, there are major factors that influence the last plating. These include:The voltage level of current.The temperature and chemical composition of the bath.The current length of time.The distance between the cathode and the anode.( ◜‿◝ )♡
PLEASE MARK ME BRAINLIEST AND FOLLOW ME LOTS OF LOVE FROM MY HEART'AND SOUL DARLING TEJASVINI SINHA HERE ❤️Need help with some chem equations
1. While diving under 3.7 atm of pressure, a gas bubble of 25 mL was found when release at surface at 1 at how big did the bubble get
2. a blue 3 L balloon at 25c was moved to a temperature of 38c what is new volume
3. 1.72 L of gas at STP was transferred to a new container with temps 18c and volume of 3.1 L what is new pressure
Answer:
1. 92.5 ml
2. 3.13 L
3. 524.48 K
Explanation:
1. Using Boyle's law equation:
P1V1 = P2V2
Where;
P1 = initial pressure (atm)
V1 = initial volume (ml)
V2 = final volume (ml)
P2 = final pressure (atm)
Based on the information in question 1: P1 = 3.7atm, P2 = 1atm, V1 = 25 mL, V2 = ?
3.7 × 25 = 1 × V2
92.5 = V2
V2 = 92.5ml
2. Using Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
Based on the information provided: V1 = 3L, V2 = ?, T1 = 25°C = 25 +273 = 298K, T2 = 38°C = 38 + 273 = 311K
3/298 = V2/311
Cross multiply
298 × V2 = 3 × 311
298V2 = 933
V2 = 933 ÷ 298
V2 = 3.13L
3. Using Charles law equation as follows:
V1/T1 = V2/T2
Where;
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
Based on the information provided; V1 = 1.72 L, T1 = 18°C = 18 + 273 = 291K, T2 = ?, V2 = 3.1L
1.72/291 = 3.1/T2
Cross multiply
1.72 × T2 = 291 × 3.1
1.72T2 = 902.1
T2 = 902.1 ÷ 1.72
T2 = 524.48K
how many moles are in 7.12 x 10^21 atoms of iron?
To Find :
How many moles are in [tex]7.12 \times 10^{21}[/tex] atoms of iron.
Given :
We know, 1 mole of any element or compound contains exactly [tex]N_A[/tex] ( Avogadro's Number ) atoms/compound .
Now, [tex]N_A = 6.022 \times 10^{23}[/tex]
So, number of moles in given number of atoms are :
[tex]n = \dfrac{6.022 \times 10^{23}}{7.12 \times 10^{21}}\\\\n = 1.18 \times 10^{-2} \ mol[/tex]
Hence, this is the required solution.
which term best described energy stored in batteries and food
Answer:
energy stored is potential.
Explanation:
What is made up of thousands of islands and coral reef in the Pacific Ocean
A:Australia
B:pacific Realm
C:Antarctic
Answer:
sidjnfjdueirb sidisjsiwijejdkdodif
6 Select the correct answer. A substance is followed by the symbol (l) in a chemical equation. What does the symbol represent?
A. The substance has the least molecules in the equation.
B. The substance is in the liquid state.
C. The substance is produced last in the reaction.
D. The substance is dissolved in a liquid solution.
E. The substance is lost at the end of the reaction.
Answer:
B. The substance is in the liquid state.
Explanation:
The symbol (l) in a chemical equation represents that the substance is in liquid state which is one of the physical states of a chemical substance.
Use the equation below:
2Na + Cl2 ==> 2NaCl
+ O
How many grams of NaCl are produced when 1.25 moles of Cl2 reacts with Na?
Explanation:
2/1×1.25
=2.5 mole of NaCl are produced
weight of NaCl produced = moles × molar mass of NaCl
weight of NaCl produced = 2.5×58.5
weight of NaCl produced =146.5 grams
What volume of hydrogen will produced at 1.45 atm and a tempeture of 20C by the reaction of 37.6g of magnesium 1Mg+2H2O--> Mg(OH)2+H2
Answer:
V = 25.7 L.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to solve for the volume of hydrogen, by firstly calculating the moles of this gas produced by 37.6 g of magnesium, according to the 1:1 mole ratio between them:
[tex]n_{H_2}=37.6gMg*\frac{1molMg}{24.305gMg}*\frac{1molH_2}{1molMg}=1.55molH_2[/tex]
Now, we use the ideal gas equation:
[tex]PV=nRT[/tex]
To solve for the volume, and obtain:
[tex]V=\frac{nRT}{P}\\\\V=\frac{1.55mol*0.08206\frac{atm*L}{mol*K}*293.15K}{1.45atm}\\\\V=25.7L[/tex]
Regards!
What is the concentration of hydrogen ions in a solution with a pH of 2.36?
Question 24 options:
a)
7.34x10-2 M
b)
4.37x10-3 M
c)
1x102.36 M
d)
6.95x10-3 M
Answer:
b) 4.37x10-3 M. is the correct answer
See the attached page, I've shown the calculation over there
A balance and a graduated cylinder are used to determine the density of a liquid sample. The sample has a mass of 14.0 g and a volume of 2.0 mL. What is the density of the liquid sample
Answer:
Density = 7 g/mL
Explanation:
Given that,
Mass of a sample, m = 14 g
Volume of the sample, V = 2 mL
We need to find the density of the liquid sample. We know that the density of an object is given by :
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{14\ g}{2\ mL}\\\\d=7\ g/mL[/tex]
So, the density of the liquid sample is 7 g/mL.
Water can keep engines operating at low temperatures. Which property of water most likely gives it this ability?
A. it boils at around 100°C
B. it has a high heat capacity
C. it is a good lubricant
D. it can change from water to ice
Answer:
B: it has a high heat capacity
Explanation:
When any material has a high specific heat capacity/ heat capacity, it doesn't heat or cool very fast. So water can absorb more heat from the engine and can keep the engine cool or at low temperature for a longer period of time.
determine the number of significant figures in 478 cm
Answer:
There are 3 significant figures on this one.
Nuclear power plants use fission reactions to produce electric power. Nuclear fusion is not yet a practical energy source because it -
Nuclear fusion is not yet a practical energy source due to no available environment on the earth.
Why nuclear fusion is not possible on the earth?Nuclear fusion is not yet a practical energy source because it requires very hot environment which is not possible on the earth. Nuclear fusion reactions occur only on the sun because the temperature is very high and environment is suitable for the reaction,
So we can conclude that Nuclear fusion is not yet a practical energy source due to no available environment on the earth.
Learn more about fusion here: https://brainly.com/question/17870368
#SPJ2
Can someone please help
Answer:the third one
Explanation:
What environmental factors affect animal characteristics?
factor that could affect
Answers:
There's many factors, such as the temperature, rainfall, food available, and the surrounding terrain, that all can effect an animal's characteristics.
Which force is most responsible for binding together an atom’s protons and neutrons?
electrostatic
gravitational
nuclear
magnetic
Answer:
Hello There!!
Explanation:
I believe the answer is nuclear.
hope this helps,have a great day!!
~Pinky~
Answer:
C) Nuclear
Explanation:
Trust the process
Edge 2021
2Al + 6HCl --> 2AlCl3 + 3H2 Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP? ( 8.8 g )
Answer:
8.8g of Al are necessaries
Explanation:
Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.
To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:
Moles H2:
PV = nRT; PV/RT = n
Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP
Replacing:
1atm*11L/0.082atmL/molK*273.15K = n
n = 0.491 moles of H2 must be produced
Moles Al:
0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required
Mass Al -Molar mass: 26.98g/mol-:
0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries
you can test carbon dioxide gas with
Answer: Carbon dioxide reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through limewater, the limewater turns milky or cloudy white.
Explanation:
****Isra****
1 Mg (s) + 2 HCl (aq) --> 1 MgCl2 + 1 H2 If 2.50 mol of hydrochloric acid is reacted, how many moles of magnesium chloride is produced?
Answer:
1.25 moles of magnesium chloride are produced
Explanation:
Based on the reaction:
Mg(s) + 2HCl (aq) → MgCl₂(s) + H₂(g)
1 mole of magnesium, Mg, reacts with 2 moles of hydrochloric acid, HCl, to produce 1 mole of magnesium chloride, MgCl₂ and 1 mole of hydrogen gas.
To solve this question we have to tak, from the chemical equation:
2 mol HCl = 1mol MgCl₂
That means, the moles of MgCl₂ produced from 2.50mol HCl are:
2.50 mol HCl * (1mol MgCl₂ / 2mol HCl) =
1.25 moles of magnesium chloride are producedHow does Chernobyl Episode 4 portray the traumatic effects of the situation on people, as opposed to the effects of the radiation?
Answer:
Showing changing colour of the skin who exposed to the radiation.
Explanation:
Chernobyl Episode 4 portray the traumatic effects of the situation on people by showing changing colour of skin of the staff present at nuclear reactor at the time of explosion. The people who exposed to the radiations of the nuclear reactor will die later in the hospital which shows that radiation of nuclear reactor is hazardous and damaging for the skin as well as for the body of humans.
2Al(s) + 3Cu^3 + (aq) -> 2Al^3 + 3Cu(s) which reactant is reduced and which is oxidicided.
Pls help I have a test in 1h
Answer:
Al is oxidized
Cu is reduced
Answer:
here
Cu is reduced
and
Al is oxidised
hope this will help you
have a nice day
If you were provided a list of chemical formulas (ex: NaCl, CO 2 CaCl 2 , SO 3 ) just the formula, how might you identify which are and which are covalent?
Answer:
See Explanation
Explanation:
The question is asking us about how to determine which compounds are ionic and which compounds are covalent.
First, we must understand that ionic compounds are formed between metals and nonmetals having a large difference in electronegativity.
Secondly, covalent compounds are mostly formed between atoms of nonmetal elements.
If we keep these things in mind, we can see that compounds such as NaCl and CaCl2 are ionic while CO2 and SO3 are covalent.
What is the pH of a solution with an H3O+ concentration of 5.67 x 10-4 M?
a. 1.00
b. 3.25
C. -1.00
d. -3.25
Answer:
3.25Explanation:
The pH of a solution can be found by using the formula
[tex]pH = - log [ { H_3O}^{+}][/tex]
From the question we have
[tex]ph = - log(5.67 \times {10}^{ - 4} ) \\ = 3.2464[/tex]
We have the final answer as
3.25Hope this helps you
1. Define an element. Give at least five examples.
an element is a substance that cannot be split into simpler substances by a chemical means . for example - hydrogen, oxygen, nitrogen, carbon, iron, aluminium, copper, silver and gold some example of elements.
Why are polar gases, such as H2O and NH3, more likely to deviate from the ideal gas behaviors described by the kinetic molecular theory? (3 points)
Question 4 options:
1)
The density of these gases is high, increasing the number of collisions and reducing their elasticity.
2)
The fluidity of these gases is high, resulting in a higher average kinetic energy.
3)
The particles have a significant volume, reducing the space between the moving particles.
4)
The particles have high intermolecular forces, reducing the elasticity of their collisions.
Answer:
HCl, H2O, and NH3 are the most polar of these, so they won't behave ideally because the particles have greater attractive forces between them. How does the kinetic-molecular theory explain the pressure exerted by gases? ... Particles are always in motion and when they are contained, they are elastic collisions.
The particles have high intermolecular forces, reducing the elasticity of their collisions.
What are polar gases?Polar molecules are formed when a high electronegative atom combined with a less electronegative atom.
Ammonia, sulfur dioxide, hydrogen sulfide, are polar gases.
The non-polar gases are inert gas or noble gas.
The polar compounds are asymmetrically array.
Thus, the correct option is 4, The particles have high intermolecular forces, reducing the elasticity of their collisions.
Learn more about polar gases, here:
https://brainly.com/question/25867706