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.
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
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.
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.
Which statement is correct about molarity and volume?
Answer:
Explanation:
If the choices are:
A. Molarity is defined as moles of solute per liter of solvent.
B. % by mass is defined as grams of solute per 100 g of solvent.
C. % by volume is defined as grams of solute per 100 L of solution.
D. Molarity is defined as moles of solute per liter of solution.
E. All of the above.
then the ans is E
Answer:
They are inversely related.
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
ALL THE THINGS YOU SAID ALL THE THINGS YOU SAID RUNING THROUGH MY HEAD RUNNING THROUGH MY HEAD HELPPPP
Answer:
Gamma rays and X-rays
Explanation:
All the things she said
All the things she said
Running through my head
Running through my head
Running through my head
All the things she said
All the things she said
Running through my head
Running through my head
All the things she said
This is not enough
This is not enough
why metal in the middle of metal activity series can't be obtained by heating ors in air
Answer:
See Explanation
Explanation:
The way by which a metal is obtained from its ore is determined by the chemical reactivity of the metal.
Metals that are highly reactive are chiefly obtained by electrolysis of the metal salt. These metals are found high up in the metal activity series.
Metals that are at the middle of the series are moderately reactive and are obtained by electrolysis or by reduction since they still form ionic salts.
Metals that are far lower in the series can only be obtained by heating them in air because they are mostly unreactive.
Hence, moderately reactive metals at the middle of the series are not obtained by roasting in air.
What element is produced when Mercury - 204 undergoes alpha decay?
Answer:
bismuth
Explanation:
i think if not i am so sorry
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.
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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
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
PLZ HELP ILL MARK BRAINLIEST
A glacial moulin increases the rate of ice sheet melting by...
O causing the ice sheet to melt from the middle
O increasing friction between the ice and bedrock
O reducing friction between the ice sheet and the bedrock
O melting the top center of an ice sheet
What is the electron structure of nitrogen?
o 1s 2s 2p 5
o 1s 22s22p3
O1s 328 32p
15 225 235 22p
Answer:
(1s)^2 (2s)^2 (2p)^3
Explanation:
Nitrogen has 7 electrons. Hence, the structure will be,
=>(1s)^2 (2s)^2 (2p)^3
Hope it helps:)
The electronic configuration is used to explain the orbitals of an atom and it helps to determine the physical and chemical properties of the elements. The electronic configuration of Nitrogen is 1s² 2s² 2p³. The correct option is B.
What is electronic configuration?The distribution of electrons in the atomic orbitals is given by the electronic configuration. It is a standard notation in which all the electrons holding atomic subshells are arranged in a sequence. Each element has a unique electronic configuration.
The electronic configuration of an element can be written in two ways, in standard notation, and in condensed form. In the case of elements with larger atomic numbers, the electronic configuration becomes lengthy in standard notation. So in such cases condensed form is generally used.
The electronic configuration of 'N' of atomic number 7 in standard form is 1s² 2s² 2p³ and in condensed form it is [He] 2s²2p³.
Thus the correct option is B.
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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!
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.
Acceleration is inversely proportional to the:
Force
Mass
Depends on the acceleration given
Giving brainlist on this one
I would be grateful!
Answer:
Explanation:
acceleration is inversely proportional to the mass of an object.
Newton's second law states that "the acceleration produced on a body is directly proportional to the resultant force anf inversely proportional to its mass".
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
20. In which medium do sound waves move the fastest?
A gases
B liquids
C water vapor
D solids
Answer:
D. Solids
Explanation:
Answer:
B
Explanation:
When water evaporate, it moves faster
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.
b. A reaction occurs between the vinegar and the
alkaline sting. What is this reaction called?
50 extra points and brainliest if right !!!
Why are there volcanoes on the Ring of Fire?
O A. Radioactive elements decay.
B. There is no plate movement.
C. There are no earthquakes. D. Two plates are colliding.
Answer:
D. Two Plates are colliding.
Answer:
D
Explanation:
The ring of fire has very large amount of plate collision so it cannot be B.
It can't be A either because the ring of fire has nothing to do with radioactive element decay.
The two main things with the ring of fire is the fact that there are a lot of volcanos and earthquakes, so it cannot be C.
Since the ring of fire has so many collisions of plates, and none of the other answers are correct, the answer is D.
Hope this helps!
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 producedWhat 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
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****
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
Can someone please help
Answer:the third one
Explanation:
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 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 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.
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.
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