Answer:
True
Explanation:
The law of conservation of energy is a physical law that states energy cannot be created or destroyed but may be changed from one form to another. Another way of stating this law of chemistry is to say the total energy of an isolated system remains constant or is conserved within a given frame of reference.
Brainliest?
The value of delta at 25c for the formation of pocl3.
°ΔG rxn = -1108.7
Further explanationMaybe the question is like this
the value of ΔG° at 25 °C for the formation of POCl₃
Reaction
P₂(g)+O₂(g)+3Cl₂(g)⇒2POCl₃(g)
Formula
[tex]\tt ^o\Delta G_{rxn}=^o\Delta G_f~product-^o\Delta G_f~reactants[/tex]
You can find table to find ΔG° at 25 °C(298 K)
°ΔG POCl₃ = -502.5 kJ/mol
°ΔG O₂ and °ΔG Cl₂ = 0
°ΔG P₂ = 103.7 kJ/mol
[tex]\tt ^o\Delta G_{rxn}=2.^o\Delta G~POCl_3-^o\Delta GP_2\\\\^\Delta G_{rxn}=2.(-502.5)-103.7=-1108.7~kJ/mol[/tex]
what is Bohr's atomic model?
Answer:
The Bohr model and all of its successors describe the properties of atomic electrons in terms of a set of allowed (possible) values. Atoms absorb or emit radiation only when the electrons abruptly jump between allowed, or stationary, states. Direct experimental evidence for the existence of such discrete states was obtained (1914) by the German-born physicists James Franck and Gustav Hertz.
Explanation:
Why do oceanographers take measurements of the conductivity of the
seawater?
A. Conductivity tells water temperature.
B. Conductivity can be used to calculate the salinity of the water.
C. Conductivity helps oceanographers avoid dangerous electricain
situations.
D. Conductivity tells how much marine life is in the water.
Answer:
B. Conductivity can be used to calculate the salinity of the water.
I am 100% sure this is the correct answer :)
Which type(s) of elements bonded to form the solute that would be considered ionic
and which type bonded to form the solute that would be considered covalent? (i.e.
metal with nonmetal, metal with metal, nonmetal with nonmetal)
Answer:
Ionic Bonds are formed from metal to nonmetals. Covalent Bonds usually form from nonmetals.
Explanation:
9. Which of the following is correctly matched?
A. Gold: Element: Silver: Compound
B. Oxygen: Element: Water: Compound
C. Sugar: Element: Salt: Compound
D. Water: Element: Hydrogen: Compound
Answer:
B
Explanation:
Oxygen (O2) is made up of two oxygen atoms but, just of one kind of atom oxygen (O), So it's an element. Water (H2O) is made up of two hydrogen atoms (H) and one oxygen atom (O), so it's a compound
What charge does nitrogen form when it satisfies the octet rule?
A: 3
B: -3
C: 5
D: -5
If a jet traces 395,000 meters in 9000 seconds. What was the speed of the jet?
Answer:
43.89 m/sExplanation:
The speed of the jet can be found by using the formula
[tex]v = \frac{d}{t} \\ [/tex]
d is the distance
t is the time taken
From the question we have
[tex]v = \frac{395000}{9000} = \frac{395}{9} \\ = 43.8888...[/tex]
We have the final answer as
43.89 m/sHope this helps you
ERGENT!!!!!!!!!!!: A runner eats a snack with 375 Calories of nutritional energy. After her snack, she burns 3,160 kJ while running. [1 Calorie = 4.184 kJ] Which of the following statements is TRUE? (Select ALL that apply) *
A. There were 3,140 kJ of energy in the snack.
B. There were 1,570 kJ of energy in the snack.
C. During her run, she used 755 Calories of energy.
D. During her run, she used 189 Calories of energy.
E. The runner used fewer Calories while running than she consumed during her snack.
F. The runner used more Calories while running than she consumed during her snack.
Answer:
B. There were 1,570 kJ of energy in the snack.
C. During her run, she used 755 Calories of energy.
F. The runner used more Calories while running than she consumed during her snack.
Explanation:
According to this question, a runner eats a snack with 375 Calories of nutritional energy. After her snack, she burns 3,160 kJ while running.
Since 1 Calorie = 4.184 kJ, it means that the runner consumed 375 × 4.184 = 1570 kJ of energy. In other words, THERE WERE 1,570 kJ OF ENERGY IN THE SNACK.
Also, the runner burns 3,160 kJ while running meaning that she equivalently burnt 3160/4.184 = 755.258 calories. Approximately, 755 calories of energy were burnt by the runner while running.
In a nutshell, the runner consumed 375 calories of energy in her snack but used up 755 calories while running. This means that the runner used more Calories while running than she consumed during her snack.
Water has a higher boiling point than expected because what?
Answer:
Water has strong hydrogen bonds between molecules. These bonds require a lot of energy before they will break. This leads to water having a higher boiling point than if there were only weaker dipole-dipole forces. Water also has a high specific heat.
Explanation:
Hope this helped it is what I could find!
Answer: Water has a higher boiling point than expected because hydrogen and oxygen form single covalent bonds. Molecules of water is bound together by strong attractions which needs high energy to break resulting to a higher boiling point of water than most substances.
Explanation: Water has strong hydrogen bonds between molecules. These bonds require a lot of energy before they will break. This leads to water having a higher boiling point than if there were only weaker dipole-dipole forces. Water also has a high specific heat.
The missing components in the table to the right
are indicated with orange letters. Use the periodic
table in the tools bar to fill in the corresponding
values.
Element
Electron
affinity
(kJ/mol)
Electro-
negativity
A
Bromine
324.6
2.96
B
B
Chlorine
А
00
С
Magnesium
0
С
D
Sodium
52.8
The missing components in the table to the right are indicated with orange letters. Use the periodic table in the tools bar and this link Web Elements to fill in the corresponding values. A B C D E F G. 2. See answers. Log in to add ... F = 737.7kJ/mol. G = 495.8kJ/mol. Explanation: We are asked some of the ...
2 answers
The missing components in the table to the right are indicated with orange letters. By using the periodic table and the tools bar corresponding values are (A) 349 (B) 3.16 (C) 1.31 and (D) 0.93.
What is Electron Affinity?The electron affinity of an atom or molecule is defined as electricity launched when electrons are introduced to the outermost shell. Electron affinity increases from left to right across a length.
What's Electronegativity?Electronegativity is described because the tendency of an atom attracts the bonded pair of electrons of covalent bond to itself. To a degree, the electronegativity Pauling scale is used.
Learn more about the Electronegativity here: brainly.com/question/2415812
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How many TOTAL atoms are in the following molecule? NaHCO3
Answer:
NaHCO3 = No. of atoms are 1 sodium + 1 Hydrogen + 1 carbon + 3 oxygens = 6 atoms per molecule.
what is a significant figure of 0.502 ?
3
Which statement best describes the difference between a mixture and a compound?
A Compounds are pure elements.
B Compounds contain elements chemically bonded together.
Compounds can be easily separated into distinct parts.
D
Compounds have multiple boiling points.
<
Answer:
B
Explanation:
Compounds are substances that are formed by the chemical combination of two or more elements in fixed proportions, while mixtures are substances that are formed by physically mixing two or more substances.
PLEASE HELP!! I GIVE BRAINLIEST
1)Which process represents chemical change?
A. A lake freezes over into ice.
B. A metal bar is rolled into a flat sheet.
C. Vinegar bubbles when baking soda is added. D. Sand, water, and salt combine to form a mixture.
2)Which process is an example of a physical change?
A. Carrots are cut into small pieces and mixed into a salad.
B. A peanut butter sandwich is eaten and broken down by enzymes in the stomach.
C Sodium metal and chlorine gas are combined to form sodium chloride, or table salt.
D. Sodium metal and water are combined to form a basic compound and a flammable gas.
3) Which of the following is a chemical change?
A. Water boiling
B. Paper being cut
C. Ice melting
D. rusting
4) Which of these is a clue that a chemical change has occurred?
A. A beaker suddenly becomes very warm when you mix two room-temperature it.
B. A liquid forms bubbles when it reaches a high temperature.
C. Water changes color when you add food coloring to it.
D. Sugar crystals disappear when dissolved in water.
5) To cause a chemical change in wood, you can ...
A. Break it.
B. Burn it.
C. Cut it.
D. Saw it.
6) Which of the following is not a good indication that a chemical change has occurred?
A. The formation of gases
B. A change in color
C. A scratched surface
D. The release heat or light
Answer:
1)C 2)B 3)D
Explanation:
1. The process represents chemical change is vinegar bubbles when baking soda is added.
2. The process is an example of a physical change is carrots are cut into small pieces and mixed into a salad.
What is physical and chemical change ?The appearance or form of matter changes during a physical change, but the type of matter in the substance does not.
A chemical change, on the other hand, changes the type of matter and creates at least one new substance with new properties.
3. Rusting is a chemical change.
4. A beaker suddenly becomes very warm when you mix two room-temperature it is a clue that a chemical change has occurred.
5. To cause a chemical change in wood, you can burn it.
6. A scratched surface is not a good indication that a chemical change has occurred.
Thus, The process represents chemical change is vinegar bubbles when baking soda is added.
To learn more about the physical and chemical change, follow the link;
https://brainly.com/question/11321843
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How many moles of Gold (III) sulfide must decompose to produce 4.32 moles of gold
metal given the reaction Au2S3 --> 2Au + 35
Answer:
2.16 moles of Au₂S₃ are decomposed.
Explanation:
Given data:
Number of moles of gold (III) sulfide decomposed = ?
Number of moles of gold metal formed = 4.32 mol
Solution:
Chemical equation:
Au₂S₃ → 2Au + 3S
Now we will compare the moles of Au₂S₃ with gold metal.
Au : Au₂S₃
2 : 1
4.32 : 1/2×4.32 = 2.16
2.16 moles of Au₂S₃ are decomposed.
A student mixes 250 millimeters of a strong base with 100 millimeters of a strong acid. What will the result be?
- a weak base
— weak acid
- a stronger base
- a stronger acid
Answer:
A stronger base.
Explanation:
In neutralization reactions, when an acid is mixed with a base, both species react to different degrees that depends on the concentrations and volumes of the acid and the base. In this case the student mixes a strong base (250 mL) with a strong acid (100 mL), what will happen is that the substance that is going to predominate (strong base) will be the one that is in greater quantity than the other, so the solution will remain a strong base.
you dont have to write the essay but can someone just explain it to me please
and ill give brainliest ofc :)
Answer:
Basically, it is asking you to give an example of something that could replace nitrogen in the chemical, but would still produce the same result.
Hi. I need a comprehensive note on :
Types of Chemical Reaction .
Answer:
The five basic types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Analyzing the reactants and products of a given reaction will allow you to place it into one of these categories.
Explanation:
You found three bottles of unlabeled chemicals. Describe how you could easily relabel these three bottles
Pb+feSO4 - pbSO4 + fe
Lead + Iron(II) Sulfate = Lead Sulfate + Iron
Lead - Pb
Plumbum Element 82 Bulk Lead 鉛 Lead (native) Lead-210 Pb-210 210Pb
Iron(II) Sulfate - FeSO4
Iron Sulfate (1:1) Iron(II) Sulfate (1:1) Ferrous Sulfate (anhydrous) Ferrous Sulfate Ferrous Sulfate (anh.) Iron(2+) Sulfate (anh.) FeSO4 Fe(II)SO4
Lead Sulfate - PbSO4
Anglesite
iron - Fe
Element 26 Fer 26Fe Eisen Ferrum Hierro Ferrum Metallicum 鐵
How many grams are in 7.23 x 10^24 Al atoms?
Answer:
323.76 g
Explanation:
The number of grams of the given atoms of Aluminum is 323.73 grams.
The given parameters:
Atom of the Aluminum, = 7.23 x 10²⁴The number of grams of the given atoms of Aluminum is calculated as follows;
6.02 x 10²³ atoms of Aluminum = 27 grams7.23 x 10²⁴ atoms of Aluminum = ?[tex]= \frac{7.23 \times 10^{24} \times 27 \ g}{6.02 \times 10^{23}} \\\\= 323.73 \ g[/tex]
Thus, the number of grams of the given atoms of Aluminum is 323.73 grams.
Learn more about atoms of element here: https://brainly.com/question/6258301
How does heat energy from the sun reach Earth?
A. Conduction
B. Radiation
C. convection
d. other
what happens when you add a proton to a hydrogen atom
Answer:
The Hydrogen Atom
The atom consists of a proton and an electron held together by the electromagnetic force between the positively charged proton and the negatively charged electron. If we add a proton to the hydrogen nucleus we would get helium (a different element). Here are two common isotopes of helium.
What type of particles move to create electricity
Again for the subject there was no sentence
Answer:
Electrons
Explanation:
If the weight of displaced liquid and the weight of an object are the same, the object will:
Answer:
Float
Explanation:
If the weight of liquid displaced and the weight of an object are the same, the object will float in the liquid.
From Archimedes principle, when an object is immersed in fluid, a force called upthrust supports it and it equal to the weight of the liquid displaced.
When in a liquid, the weight of the liquid displaced is the same as that of the of the object, it will float and not sink.
How can the shape of a molecule determine its polarity.
Answer:
Letter D
Explanation:
What is the difference between oxygen-16 and oxygen-18
Answer:
Oxygen 16 has 8 protons and 8 neutrons while Oxygen 18 has 8 protons and 10 neutrons . These are isotopes of oxygen i.e same no. of protons but different no. of neutron .
Hope You Understood .
i’ll give brainliest just please help me out with the answers haha thanks <3
Answer:
i dont see tha pic
Explanation:
a summary about a gas 5 sentences
Answer:
Gases have two properties that set them apart from solids and liquids. First, gases spontaneously expand to fill the container they occupy, no matter its size. In other words, a gas has no fixed volume or shape. Secondly, gases are easily compressible.
Explanation:
Hope this helps
If a bug is traveling 5 meters across the floor in 5 seconds. How fast did it
travel?
Answer:
5 seconds
Explanation:
Speed x Time. So t=ds. t=51=5.