Answer:
4 P(s, white) + 5 O₂(g) ⇒ P₄O₁₀(s)
Explanation:
The standard enthalpy of formation of P₄O₁₀(s) is the energy required to synthesize 1 mol of P₄O₁₀(s) from the simple substances in their most stable form. The corresponding balanced chemical equation is:
4 P(s, white) + 5 O₂(g) ⇒ P₄O₁₀(s)
P(s, white) is the most stable allotropic form of phosphorus. The standard enthalpy of formation of P₄O₁₀(s) is -2984 kJ/mol.
A student with a body temperature of 37°C holds a piece of
ice that has a temperature of -8°C.
Vhich statement best explains what happens?
A. Thermal energy transfers coldness from the student's hand to the
ice.
B. Thermal energy transfers heat from the student's hand to the ice.
C. Heat transfers thermal energy from the student's hand to the ice.
D. Heat transfers coldness from the ice to the student's hand.
Answer:
D i think. Not sure.
Explanation:
I mean i just did it myself, and i dont really do chemistry, but I would say D sorrry if i made you get it wrong!!
Answer:
C. Heat transfers thermal energy from the student's hand to the ice.
Explanation:
I got it right on my test apix
How many moles are present in 54.8 mL of mercury if the density of mercury is 13.6 g/mL?
Answer:
3.72 mol Hg
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisDensity = Mass over VolumeExplanation:
Step 1: Define
D = 13.6 g/mL
54.8 mL Hg
Step 2: Identify Conversions
Molar Mass of Hg - 200.59 g/mol
Step 3: Find
13.6 g/mL = x g / 54.8 mL
x = 745.28 g Hg
Step 4: Convert
[tex]745.28 \ g \ Hg(\frac{1 \ mol \ Hg}{200.59 \ g \ Hg} )[/tex] = 3.71544 mol Hg
Step 5: Check
We are given 3 sig figs. Follow sig fig rules and round.
3.71544 mol Hg ≈ 3.72 mol Hg
who can help me on this one ?
Answer:
eight strong bonds to the atoms that it touches and six weaker bonds to the atoms it almost touches. This makes it easier to understand why a metal might prefer the body-centered cubic structure to the hexagonal or cubic closest-packed structure.
Mrs. Elder travelled from Zillah, WA to Tacoma, WA in 3 hours. She traveled 201 miles on the trip. What was the speed she traveled at with no stops? (Speed=Distance/Time)
Answer:
201 ÷ 3 = 67mph
Explanation:
let me know if you want me to explain more
It refers to the cracked sections of the earth's crust.
Answer:
Plates
Explanation:
The Earth's crust is broken up into sections called plates. Tectonic plates are on the mantle which allow them to move.
Two students stand close to each other Why do they not get pulled closer to each other due to the gravitational pull they exert on each other
Answer:
there gravitational force is very less to pull the weight of a person.
Two students who stand close to each other don't get pulled closer as a
result of gravitational force because the magnitude of the force is small.
Gravitational force acts on all objects on Earth but the force exerted is very
small as a result of the masses of the students being very small as to when
compared with that of the earth.
The large difference in mass of the student and earth is the reason why the
effect of the force is very little and unable to move them closer.
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What is the number of moles in 0.025g (NH4)2Cr2O7
Answer:
9.91 X 10^-5 or 0.000099 mol
Explanation:
Based on the octet rule, phosphorus most likely forms a ________ ion.
A. P5+
B. P3+
C. P5-
D. P3-
E. P+
Based on the octet rule, phosphorus most likely forms a P³⁻ ion; option D.
What is the octet rule?The octet rule is a rule which describes the way in which atoms of elements behave in terms of electron arrangement or distribution in order to achieve stability.
The octet rule states that atoms of elements achieve stability when they have eight electrons in their valance shells.
It explains that atoms of elements will gain, lose or share a certain number of electrons in order to achieve the stable electronic configuration of the noble gases.
Phosphorus has five electrons in its valence shell and will accept three electrons in order to have an octet.
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20 POINTS!!!
3. Which substance will take more energy to heat from 20C to 100C?
a) 30 g of water
b) 300 g of water
and WHY?
Answer:
300g of water because its a larger amount
Explanation:
During the production of yogurt, specific ___________ are used to ferment the milk. In turn, the same ___________ are beneficial to our digestive system when we eat the yogurt.
Question 10 options:
A)algae
B)bacteria
C)fungi
D)protozoan
I will give you brainlest
What is the enthalpy for reaction 1 reversed?reaction 1 reversed: N2O4→N2 + 2O2
Express your answer numerically in kilojoules per mole.
Answer:
8kJ/mol
Explanation:
since the forward reaction is -8kJ/mol, the backward reaction has the same enthalphy but reversed
The enthalpy of the reaction is 8kj/mol because it is a reversed reaction.
Since the forward reaction is -8kj/mol, thebackward enthalpy will be 8kj/mol.
What is Enthalpy?Enthalpy is refers to the total sum of the internal energy that is sum up to the product of the pressure and volume in a system of reaction.
Therefore, The enthalpy of the reaction is 8kj/mol because it is a reversed reaction. Since the forward reaction is -8kj/mol, the backward enthalpy will be 8kj/mol.
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On Stemscopes
take your time.
Rapid growth of algae in a pond is often the result of-
O loss of habitat due to commercial building.
O flooding that causes water level to rise.
O excess nutrients from fertilizer runoff.
O clogged river tributaries entering a lake.
Answer:
The answer is 3
Explanation:
The nutrients from fertilizer runoff is the most probable answer, because the other 3 dont contribute to algae growth
Answer:
excess nutrients from fertilizer runoff.
Explanation:
what is the ratio of atoms of potassium to atoms of oxygen
Which represents the smallest percentage of earths water a.frozen water b. Ground water c. Salt water d.surface fresh water
ANSWER: Surface Fresh Water
Humans only use 0.3% of the water on earth. The other 99.7 percent is in the oceans, soils, icecaps, and floating in the atmosphere.
How can being Energy Independent be a bad thing?
facing the wind. A) windward B) subaric C) monsoon D) biotic
Where does condensation occur?
A. atmosphere
B. lithosphere
C. biosphere
D. hydrosphere
~~Please explain~~ :)
Answer:
A. Atmosphere
Explanation:
hope this helps
How is coffee, Lemonade, Soda, Vinegar, Orange Juice an acid?
Answer:
Curd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word acere which means sour.
Lana is testing her hypothesis that marigolds grow faster in red light than in yellow light. If the plants in yellow light grow faster during her experiment what should Lana do next? A. Assume that she made a mistake during the experiment B. Report that her hypothesis was useless C. Conclude that the experiment did not work D. Repeat the experiment to confirm the result
If the plants in yellow light grow faster during her experiment, Lana should repeat the experiment to confirm the result. Option D.
Testing hypothesesIn science, hypotheses are tested using experiments. Two hypotheses are usually formed during the course of experimentation:
Null hypothesisAlternate hypothesisThe null hypothesis is set up to either be accepted is found to be true or rejected if found to be false. The alternate hypothesis is just there for guidance.
Hypotheses being found not to be true does not always mean that the reverse will be true.
Thus, if a complete opposite is obtained during testing, the next thing would be to repeat the experiment in order to be double sure there was not a mistake.
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Name two (2) reasons and describe why it is important for you fo find a job that matches your skills, interests and abilities when searching for a career.
Answer:
It is important for you find a job that matches your skills, interests and abilities when searching for a career because then you will be satisfied with what you do and your career because since it fits your wants, skills, interests and abilities you will do a great job while working and completing tasks. Overall you'll be happy because that's the perfect job for you.
Explanation:
Most of the elements to the left of the stair-step line in the periodic table exist as _________ in the periodic table.
A. Gases.
B Liquids.
C. Plasmas.
D. Solids.
Most of the elements to the left of the stair-step line in the periodic table exist as liquids in the periodic table and the correct option is option B.
What is periodic table?
The periodic table is a tabular arrangement of the chemical elements by increasing atomic number which displays the elements so that one may see trends in their properties.
Elements are arranged from left to right and top to bottom in the order of their increasing atomic numbers. Thus,
Elements in the same group will have the same valence electron configuration and hence, similar chemical properties.Whereas, elements in the same period will have an increasing order of valence electrons. Therefore, as the energy level of the atom increases, the number of energy sub-levels per energy level increases.Therefore, Most of the elements to the left of the stair-step line in the periodic table exist as liquids in the periodic table and the correct option is option B.
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A CaCl2 solution is given to increase blood levels of calcium. If a patient receives 6.1 mL of a 12 % (m/v) CaCl2 solution, how many grams of CaCl2 were given?
Mass of CaCl₂ = 0.732 g
Further explanationThe concentration of a substance can be expressed in several quantities such as moles, percent (%) weight / volume,), molarity, molality, parts per million (ppm) or mole fraction. The concentration shows the amount of solute in a unit of the amount of solvent.
[tex]\tt \%(m/v)\rightarrow 12\%=\dfrac{mass~CaCl_2}{volume~of~solution}\times 100\%\\\\mass~CaCl_2=12\%\times 6.1\div 100\%\\\\mass~CaCl_2=0.732~g[/tex]
A piece of tin has a mass of 16.52 g and a volume of 2.26 cm3 what is the density of tin?
Answer:
The density of tin is 7.31 g/cm³.
Explanation:
Given that the formula of density is D = m/v where m represents mass and v is volume :
D = 16.52/2.26
D = 7.31 g/cm³ (3sf)
How many grams of sodium hydroxide is exactly required to react with 3.86 mol of sulfuric acid?
Answer:
20.4g NaOH
Explanation:
Because, trust the drip, trust the drip
QUESTION:
What was the Proclamation of 1763? *
ANSWER CHOICES:
A. A law passed by the British parliament that allowed colonial movements west of the Appalachian Mountains.
B. A law passed by the French parliament that prohibited colonial movements west of the Appalachian Mountains.
C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.
D. A law passed by the President that prohibited colonial movements west of the Appalachian Mountains.
Answer:
C. A law passed by the British parliament that prohibited colonial movements west of the Appalachian Mountains.
Explanation:
Answer:
✔ Cumberland Gap
was a natural mountain pass through the Appalachian Mountains.
This is the Correct Answer!
This might not be the same Question. This is history 5th Unit.
The first step in mitosis is:
chromosomes pull away from each other
the nucleus of the cell forms
a cell splits apart
a second set of chromosomes is produced
Answer:
It is D. a second set of chromosomes is produced
Explanation:
Hope this helped have an amazing day!
Write balanced net ionic equations and the corresponding equilibrium equations for the stepwise dissociation of the triprotic acid H3PO4.
Answer:
[tex]H_3PO_4(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+H_2PO_4^{-}(aq); \ Ka_1[/tex]
[tex]H_2PO_4^{-}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+HPO_4^{-2}(aq); \ Ka_2[/tex]
[tex]HPO_4^{-2}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+PO_4^{-3}(aq); \ Ka_3[/tex]
Explanation:
Hello!
In this case, since the phosphoric acid is a triprotic acid, we infer it has three stepwise ionization reactions in which one hydrogen ion is released at each step, considering they are undergone due to the presence of water, thus, we proceed as follows:
[tex]H_3PO_4(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+H_2PO_4^{-}(aq); \ Ka_1[/tex]
[tex]H_2PO_4^{-}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+HPO_4^{-2}(aq); \ Ka_2[/tex]
[tex]HPO_4^{-2}(aq)+H_2O(l)\rightleftharpoons H_3O^+(aq)+PO_4^{-3}(aq); \ Ka_3[/tex]
Moreover, notice each step has a different acid dissociation constant, which are quantified in the following order:
Ka1 > Ka2 > Ka3
Best regards!
Anyone know what room temperature lemon juice feels like it's for a project and I don't have it. Will give brainly!!!!
Answer:
Since both hot and cold temperature extremes can negatively affect the enzymes, vitamins, and nutrients in lemons when making lemon water, room temperature water between 68 degrees to 79 degrees Fahrenheit is the best option.
Explanation:
hope it helps you
Reflections
What have I learned in this activity
1. I have learned that
Answer:
I havent the foggiest.
Explanation:
Answer:
Explanation:
I havent the foggies
50 POINTS!!! DUMB ANSWERS WILL BE DELETED
explain earth rotation and how days and nights are shifted
Answer:
Hope this isnt dumb!
Explanation:
Earth rotates on a axle this causes us to experience a day and night moment but however Earth's axis is tilted 23.5 degrees the and angled to measure between Earth's equatorial plane in the plane in which orbits are sun.
Answer:
The Earth rotates on it's axis, and it takes 24 hours for the Earth to go all the way around. When the part of the Earth you're on is facing the sun, you have daytime. When the part of the Earth you're on is not facing the sun (facing the moon instead), you have nighttime.
I hope this helps!