Answer:
temperature, concentration, pressure
determine the number of significant figures in 478 cm
Answer:
There are 3 significant figures on this one.
WILL GIVE BRAINLIEST
During an endothermic reaction, H for the reactants was −600 kJ/mol. Which of the following statements is correct about the H for the products the comparison of the energy in bonds? (5 points)
It is less than −600 kJ/mol, and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
It is less than −600 kJ/mol, and the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
It is greater than −600 kJ/mol, and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
It is greater than −600 kJ/mol, and the amount of energy required to break bonds is less than the amount of energy released in forming bonds.
Answer:
It is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
Explanation:
In an endothermic reaction, the reaction requires a determined amount of energy to occurs.
The reaction of the problem has H = -600kJ/mol. The reaction is endothermic and the energy that the reaction needs is absorbed by the reactants. That means, the energy of products:
Is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
Answer:
It is greater than -600kJ/mol and the amount of energy required to break bonds is greater than the amount of energy released in forming bonds.
Explanation:
An oxide of nitrogen contain its own volume of nitrogen
its vapour dentity is 22. Find the molecular formula
Of nitrogen Oxide
Answer:
NO2 is the molecular formula of nitrogen Oxide
Explanation:
Correct question
An oxide of nitrogen contain its own volume of nitrogen
its vapour dentity is 23. Find the molecular formula
Of nitrogen Oxide
Solution
As we know
Molecular Weight is equal to two times the vapour density
Hence, the molecular weight of Oxide of nitrogen is 2 * 22 = 44
Molecular weight of Oxide of nitrogen is the sum of atomic weight of nitrogen and oxygen
Molecular weight of Oxide of nitrogen = 14 + 16 *Y
14 + 16 *Y = 46
Y = 2
Hence, the formula is NO2
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.
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 element is produced when Mercury - 204 undergoes alpha decay?
Answer:
bismuth
Explanation:
i think if not i am so sorry
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
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 ❤️Which element is classified as a
metalloid?
a.
Boron
b. Potassium
C.
Sulfur
d. Xenon
Answer: Boron
Explanation:
Pick the input(s) into the system. (select all that apply)
A battery powered robot with glowing eyes walking across the floor and making noise.
Radiant/Light Kinetic Energy
Nuclear Potential Energy
Chemical Potential Energy
None of these are inputs
Motion Kinetic Energy
Electrical Kinetic Energy
Answer:
So none of the option is correct.
Explanation:
The energy is the capacity of to work.
It is a scalar quantity.
According to the law of conservation of energy, the energy can neither be created and nor be destroyed, it can transform from one form to another.
For example, in case of a light bulb, the electric energy is converted into the light and heat energy.
When a battery operated robot with glowing eyes moving on the floor, the chemical energy of the battery is converted into the light energy and the kinetic energy so the law of conservation of energy holds good.
How 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 + 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
Aleena visited a Natural Gas Compressing unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions.
(a) Low temperature, low pressure
(b) High temperature, lowpressure
(c) Low temperature, highpressure
Answer:
(c) Low temperature, high pressure
Explanation:
Liquefaction of a gas means the conversion of the gas to liquid. To convert a gas to liquid, we have to look a bit at the statements of the kinetic theory of gases.
Gases show ideal behavior within the range of high temperature and low pressure. Under these conditions, minimum intermolecular interactions occur between gas molecules.
However, as the temperature is deceased and pressure in increased, intermolecular interactions become significant and the gas begins to liquefy.
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.
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 are the possible values of ml for l=2
Answer:
-2, -1, 0, 1, 2
Explanation:
There are four types of quantum numbers;
1) Principal quantum number (n)
2) Azimuthal quantum number (l)
3) magnetic quantum number (ml)
4) Spin quantum number (s)
The azimuthal quantum number (l) describes the orbital angular momentum and shape of an orbital while the magnetic quantum number shows the projections of the orbital angular momentum along a specified axis. This implies that the magnetic quantum number shows the orientation of various orbitals along the Cartesian axes. The values of the magnetic quantum number ranges from -l to + l
For l= 2, the possible values of the magnetic quantum number are; -2, -1, 0, 1, 2
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 trophic level is a number that tells you the position an organism occupies in a food chain or food pyramid.
True
False
Answer:
true
Explanation:
which term best described energy stored in batteries and food
Answer:
energy stored is potential.
Explanation:
What is SnO2 compound name
Which statement is correct regarding metamorphic rock formation?
A) The temperature inside Earth is cooler which allows metamorphic rocks to form more quickly.
B) Small pieces of rocks are buried, squeezed, and cemented together.
C) Weathering and erosion cause rocks to break down to form metamorphic rocks.
D) The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks.
Answer:
d answer is correct
Explanation:
the deeperinto Earth’s crust the higher the pressure that forms mateamorphic rocks
The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks is the best statement regarding metamorphic rock formation. Thus, option D is correct.
What are the metamorphic rocks?Metamorphism, a process that changes one type of rock into another, is the source of metamorphic rocks. The original rock is frequently subjected to pressures of at least 100 megapascals and temperatures between 150 and 200 °C, which profoundly alter its physical or chemical composition.
They are commonly used in both architecture and art. Statues and decorative objects like vases are made of marble (Figure). Due to its extreme hardness, quartzite is frequently crushed and used to construct train rails.
Therefore, option D is correct, that the best statement about the creation of metamorphic rocks is that the pressure increases the deeper into the Earth's crust.
Learn more about the metamorphic rocks, refer to:
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Can someone please help
Answer:the third one
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
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.
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
Given the balanced equation and the equilibrium concentrations shown:
N2 + 3H2=>2NH3
Equilibrium Concentrations:
N2: 9.76 M
H2: 6.52 M
NH3: 8.62 M
What is the value of K?
Answer:
K= 0.0275
Explanation:
The K of a reaction is defined as the ratio between the concentration of products over concentration of reactants powered to its coefficient. In the reaction of the problem, K is:
K = [NH3]² / [N2] [H2]³
Replacing the concentrations in K:
K = [8.62M]² / [9.76M] [6.52M]³
K= 0.0275Answer:
The value of K is 0.027.
Explanation:
Chemical equilibrium is a state of a reversible chemical system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. That is, the chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.
The Law of Mass Action says that the product of the equilibrium concentrations of the products raised to their respective stoichiometric coefficients, divided by the product of the concentrations of the reactants in the equilibrium raised to their respective stoichiometric coefficients, is a constant for each temperature, called the equilibrium constant Kc. So, being:
aA + bB ⇄ cC + dD
Then: [tex]Kc=\frac{[C]^{c} *[D]^{d} }{[A]^{a} *[B]^{b} }[/tex]
In this case, the reaction is:
N₂ + 3 H₂ ⇒ 2 NH₃
So, the equilibrium constant is:
[tex]Kc=\frac{[NH_{3} ]^{2} }{[N_{2} ]*[H_{2} ]^{3} }[/tex]
Being:
[N₂] = 9.76 [H₂] = 6.52 [NH₃]= 8.62Replacing:
[tex]Kc=\frac{8.62^{2} }{9.76*6.52^{3} }[/tex]
Solving
Kc= 0.027
The value of K is 0.027.
is there a way u could see if the element is acid,base or salt in the periodic table?
Answer:
OK i see
Explanation:
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.
Find the mass of carbon present in 0.92 g of Ethanol, [tex]C_2 H_5 OH[/tex]
0.92 × 1/46 × 2/1 × 12/1 =
0.02 × 2 × 12 =
0.04 × 12 =
0.48 gr carbon
The mass of carbon in one mole of ethanol (46.03 g) is 12.0 g. Thus, mass of carbon in 0.92 g of ethanol is 0.48 g.
What is ethanol?Ethanol is an alcohol with the formula C2H5OH. This organic compound having a molecular weight of 46.03 g/mol.
Atomic mass of carbon = 12.01 g/mol
oxygen = 16 g/mol
hydrogen = 1.01 g/mol
Thus total mass of one mole of ethanol = (12.01×2) +(16) +(6×1.01) = 46.03 g/mol
46.03 g of ethanol contains 2402 g of carbon. Thus mass of carbon in 0.92 g of ethanol is calculated as follows;
(24.02 × 0.92) / 46.03 = 0.48 g
Hence, the mass of carbon in 0.92 g of ethanol is 0.48 g.
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