Answer:
Xe 4f14 5d3 6s2
Explanation:
12. The temperature of 50.0 g of water was raised to 50.0°C by the addition of
1.0kJ of heat energy. What was the initial temperature of water?
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree celsius of one gram of a substance. Therefore, the initial temperature of water is 27.0°C.
What is Enthalpy?
Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of solution× specific heat capacity of solution ×Change in temperature.
Enthalpy=1000 J
mass of water=0.05kg
Change in temperature=50-initial
specific heat capacity of solution=4.2
Substituting all the given values we get
1000 J= (0.05kg)(4.2)(50-initial)
initial temperature= 27.0°C
Therefore, the initial temperature of water is 27.0°C.
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When combined in the correct ratio, hydrogen and oxygen atoms can form water as show
below. In this example, water is an example of which of the following? *
Hydrogen
Oxygen
Water
A mixture
Molecules of a compound
Atoms of a compound
Molecules of an element
Answer:
ok
Explanation:
HOLMIUM
1.what is the coordinate?
2.what is the long-form electron configuration?
3.what is the short-hand electron configuration?
4.number of valence electrons?
Answer:
1. The graph where x axis and y axis are present is called coordinate.
4. 18
How many megagrams are in 90.532 g?
P Explain what happened to the temperature on the heating curve of water as the water gained heat energy over the entire period of time !!!!!!!! PLEASE PLEASE HELP MEEEEEE !!!!!!!!!! WILL MARK BRIANLIEST !!!!!!
PLEASE HELP ME
Balance the following equation: P4O10 + H2O --> H3PO4
Write the coefficients that you decide balance the equation like this 3, 4, 3. If you do not add a coefficient in front of an element or compound, use a 1 in your answer. For instance the for this balanced equation: 2H2 + O2 --> 2H2O you would write your answer: 2, 1, 2
Answer:
P4O10 + 6H2O → 4H3PO4
so 1,6,4
The balanced equation is :
P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄
What is a Balanced equation?A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.
The unbalanced equation is -
P₄O₁₀ + H₂O ⇒ H₃PO₄
There are 4 P on the reactant side, to balance P atom we need to add P on the product side also.
P₄O₁₀ + H₂O ⇒ 4 H₃PO₄
To balance the O atom on both sides, add coefficient 6 in front of water and this gives the balanced equation is written as -
P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄
Therefore,
The balanced equation is :
P₄O₁₀ + 6 H₂O ⇒ 4 H₃PO₄
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Describe the reactions role in earths natural processes?
Answer:
energy flow and nutrient cycles ( photosynthesis , food webs, decomposition webs) sediment transport and soil formation. the water cycle. reproduction/ regeneration mechanisms.
Part D
Explain how your model is different from the model in the picture.
Answer:
I am explain you in image
how many particles are in 2.4 moles of carbon dioxide
Answer:
Calculate it, times 6.022
how many atoms are in 10 Mg(OH)2?
Answer:
In a formula unit of mg (OH)2, there are one magnesium ion and two hydroxide ions, or one magnesium, two oxygen, and two hydrogen atoms
Answer:
20 atoms
Explanation:
Which of the following statements applies to a nuclear fission reaction?
a. The reaction has no commercial applications.
b. The reaction takes place only at very high temperatures.
c. The reaction produces only short-lived radioactive waste.
d. The reaction releases large amounts of energy when nuclei split apart
Answer:
d-the reaction released large amounts of energy when nuclei split apart
Explanation:
no explain
Of what are table sugar and table salt examples?
mixtures
atoms
pure substances
elements
Answer: A
Explanation:
Table salts and table sugars are pure substances. The correct option is c.
What are pure substances?
Pure substances are those substances that are made up of only one kind of atoms. They have definite mass and chemical composition. Some examples of pure substances are salt, sugar, baking soda, etc.
All chemical elements are pure substances. Table salt is an ionic compound that is made up of two elements, sodium, and chloride. It comes under pure substance as it do not contain any impurities.
Table sugar is a compound that is made up of three elements, carbon, hydrogen, and oxygen. It is a pure substance because it has fixed a chemical composition and no impurities are present in it. They are crystals.
Thus, the correct option is c. pure substances.
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Dr. Moore and his team have learned from GPS data that two continents with an ocean between them have been moving toward each other. Some students living on the coast of one of these continents don’t understand what is happening and they are worried that the continents will run into each other. How could Dr. Moore explain to them what is happening?
Answer:
Dr. Moore can explain that it is continental drift.
Explanation:
continental drift is the phenomenon due to which all the continents are moving towards each other, due to this continental drift stundents afraidthat some day these continents will collide leading to catastrophe.
But this is not gonna happen in a snap, this needs a lot of time, this will take hundreds of years and even more. So there is nothing to be afraid of till then humans will find some or the other way to manage this. Plus as I said this process is very slow so there are very less chances that this could lead us to any kind of chaos or anhilation.
(Btw, this isn't my work, it's just that someone already answered this same question, and they didn't answer yours so I thought I'd give it to you.)
How many mole of HCL is produced if 4g of hydrogen is completely reacted with chlorine
Answer:
4 moles of HCl are produced.
Explanation:
Given data:
Mass of hydrogen = 4 g
Number of moles of HCl = ?
Solution:
H₂ + Cl₂ → 2HCl
Number of moles of hydrogen:
Number of moles = mass/molar mass
Number of moles = 4 g/2 g/mol
Number of moles = 2 mol
now we will compare the moles of hydrogen and HCl.
H₂ : HCl
1 : 2
2 : 2/1×2 = 4 mol
Thus, 4 moles of HCl are produced.
Two scientists, Tara and Victor, work in the same scientific field of study. Victor asks Tara to review a research paper that he wrote to determine if it should be published. After replication, Tara suggests that Victor's paper should not be published and that he should perform his experiment again. What would be the most likely reason she suggests Victor perform his experiment before publication? Tara does not think that Victor's predictions are likely. Tara does not think that Victor's conclusions are important. Tara does not get the same results when she conducts the experiment. Tara does not find other research papers that published similar information
Answer:
Tara does not get the same results when she conducts the experiment
Explanation:
The most likely reason Tara suggested to Victor to perform the experiment again before publication would be because she did not get the same results when she conducted the experiment.
A good scientific research or experiment should have an element of reproducibility. In order words, the claim made in published scientific research should be reproducible by any other scientist that decides to replicate the research. Tara repeated Victor's experiment in order to check its reproducibility and when she could not reproduce the results, she had to tell Victor to conduct the experiment again before deciding to publish it.
12. Which one of the following is not true about the reaction of: CH3-
CH3+C12...CH3CH2CI+HCI?
a it is elimination reaction
b it is photochemical reaction
c it is chlorination reaction
d it is substitution reaction
Explanation:
CH₃CH₃ + Cl₂ → CH₃CH₂Cl + HCl
This reaction take place in the presence of light/UV rays. (i.e, photochemical reaction)It's a Chlorination reaction because here there's addition of chlorine.It's a substitution reaction because Cl substituted H from place and attach there.Option which is NOT correct is
Option A (It's not an elimination reaction)
Therefore,
Option A is correct✔
What does it mean for the energy levels in an atom to be quantized? Describe how this affects where electrons can be found.
Answer:
Energy of an electron is quantinized means the electrons can possess only specific individually separated values.
These energy levels are stable and are stationary along with different energy value. The electron remains in the state until energy is absorbed or released.
The electrons absorb energy when it moves from lower energy state to higher energy state. The electrons lose energy when it moves from higher energy state to lower energy state and thus emit radiations corresponding to the energy gap and is called as quanta.
how is sulphur dioxide gas prepared in the laboratory?wite its bleaching actions
Answer:
In the laboratory, sulphur dioxide is prepared by the reaction of metallic sulphite or a metallic bisulphite with dilute acid.
Explanation:
For example, a reaction between the dilute sulphuric acid and sodium sulphite will result in the formation of SO2. 2.
What is the chemical formula for sodium oxalate?
Answer:
The formula is Na2C2O4
Explanation:
I hope this helps
Gravity is an example of which type of force?
Answer:
attractive force
Explanation:
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For the following sets of quantum numbers, determine if it is an allowed set or not. If it is an allowed set, write the sublevel that it refers to. If it is not an allowed set, state why it is not correct.
n=3 , l = 3, ml =0, ms= -1/2
n=4 , l = 3, ml =2, ms= -1/2
n=4 , l = 1, ml =1, ms= +1/2
n=2, l = 1, ml=-1, ms= -1
n=5 , l = -4, ml =2, ms= +1/2
n=3 , l= 1, ml =2, ms= -1/2
Answer:
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Explanation:
What is the mass of 3.02 x 1025 formula units of barium nitrate?
Answer:
10000 g BaNO₃
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
3.02 × 10²⁵ formulas units BaNO₃
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ba - 137.33 g/mol
Molar Mass of N - 14.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of BaNO₃ - 137.33 + 14.01 + 3(16.00) = 199.34 g/mol
Step 3: Convert
[tex]3.02 \cdot 10^{25} \ formula \ units \ BaNO_3(\frac{1 \ mol \ BaNO_3}{6.022 \cdot 10^{23} \ formula \ units \ BaNO_3} )(\frac{199.34 \ g \ BaNO_3}{1 \ mol \ BaNO_3} )[/tex] = 9996.79 g BaNO₃
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
9996.79 g BaNO₃ ≈ 10000 g BaNO₃
Experimental data are collected as: x[100]={1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100}; y[100]={-92.3973,14.0677,98.9626,49.6151,111.88,-38.7967,52.1535,-101.325,65.6111,125.129,151.762, -123.132,-41.8744,-39.3356,-99.7856,-128.881,58.5477,-111.692,-75.3057,4.4723,-100.051,169.051, -15.6953,58.3125,147.346,10.9835,42.3421,166.697,-105.534,-90.2199,151.189,130.022,-8.1448,-51.3493, 164.427,119.154,-99.2704,155.986,133.212,118.035,13.1819,139.678,81.5178,-12.4377,-11.7671,146.627, -25.787,107.25,19.8867,15.6437,112.871,122.552,8.42037,-10.1364,146.682,178.531,203.565,-70.7871, 171.256,-50.6232,193.836,-34.7733,-68.9564,25.3423,75.6537,21.5484,46.5259,-64.22,-13.5792, 74.9213,-26.6872,30.5302,169.534,-36.7224,65.4419,113.978,68.1137,181.414,127.76,145.447,75.5486, 164.201,169.504,110.07,96.713,114.974,155.46,2.72803,-59.9407,13.426,29.9344,-11.052,176.639, 162.505,-18.3784,184.418,234.104,127.227,145.18,0.440172}; Obtain the regression line in the form of y = a x + b.
hi myself thx for the answers
HELP PLSSSSS!!
Find the molar mass of air in your room, assuming the molar mass of air is
28.97 g/mol
Volume of room is 52,681,428.8 Liters
Answer:
68133080.02 g
Explanation:
I believe that the question is to find the mass of air in the room and not the molar mass of air since the molar mass of air was already given in the question as 28.97 g/mol.
Now, if 1 mole of a gas occupies 22.4 L
x moles of air occupies 52,681,428.8 Liters
x = 1 * 52,681,428.8 /22.4
x = 2351849.5 moles of air
Now, number of moles = mass/ molar mass
but molar mass = 28.97 g/mol
2351849.5 = mass/28.97
mass = 2351849.5 * 28.97
mass = 68133080.02 g
Which picture above represents a mixture of elements?
Answer:
(a) because they are not being mixed
From the following given options, the picture showing the mixture of elements is Picture (a) i.e, Mixture of O₂ and N₂.
What is a Mixture ?
In chemistry, a mixture is a material made up of two or more different chemical substances which are not chemically bonded.
A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
Therefore, From the following given options, the picture showing the mixture of elements is Picture (a) i.e, Mixture of O₂ and N₂.
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One side of a cube is 5 cm long what is the cubes volume
Answer:
125cm^3
Explanation:
A cube has a side that is 5cm long, and a cube has all even sides. To determine the volume, you need to multiply the length, width, and height. Because all these numbers are 5, you do 5*5*5, or 5^3 power, which is 125
Which two types of information are found in an element's box in the periodic
table?
O A. Chemical composition
B. Atomic mass
C. Atomic structure
D. Element name
Answer:
The answer is B and D.
Explanation:
prove me wrong
Answer: b an d
Explanation:
Please help ASAP, I’ll do anything
These stop the electricity from flowing (examples: glass, rubber). (Lesson 5.03)
A:electric current
B:insulator
C:resistor
D:conductor
Answer:
B. insulator
hope it helps
The materials which prevents flow of electric current through it is called insulators. Thus, option B is correct. The materials which allow the current are conductors.
What are insulators?There are three types of substances based on their conducting nature. The materials which are highly conducting electrically at normal condition are called conductors. For example: metals.
Materials which does not conduct electricity at any condition are called insulators. Insulators prevent the flow of free electrons and thus are resistant to electric shock, example: wood
Some materials which does not conduct at normal temperature but, will conduct at higher temperature and also upon mixed with other materials are called semiconductors. example: silicon. Therefore, option B is correct.
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Write any three possible structures for octane,C8H18,and give their iupac names.
Answer:
(1) n-Octane
(2) 2-methyl-Heptane
(3) 3-methyl-Heptane
(4) 4-methyl-Heptane
(5) 2-ethyl-Hexane
(6) 3-ethyl- Hexane
Explanation:
We are given Octane which has the chemical formula as C8H18, and we need to find its three possible structures.
Isomerism is defined as the phenomenon in which a chemical compound will consist of the same chemical formula but it will have different orientation or bond arrangements. in simpler meaning isomers of a compound has same chemical formula but has different structures.
Some possible isomers of the compound Octane are given as in terms of their IUPAC names.
Chemical formula : C8H18
(1) n-Octane
(2) 2-methyl-Heptane
(3) 3-methyl-Heptane
(4) 4-methyl-Heptane
(5) 2-ethyl-Hexane
(6) 3-ethyl- Hexane