Answer:
Temperature= -327.2 celsius
Explanation:
You can set up an equation:
-104 = x
71.8 225.9
What does a negative A Hf for a molecule mean?
Energy was released when the molecule went through a phase change.
Source:
Trust me bro
Answer:
Energy was released when the molecule was formed from its elements
Explanation:
a p e x
help me with my bell work
Answer:
1) It gets slower the farther out they are.
2) The farther out you are from the sun the less gravitational pull you have, which makes it go slower as it orbits.
3) Gravity ;) :)
Explanation:
Hope this helps! Plz mark as brainliest! :)
1.) The four inner planets have slower orbits and the four outer planets have faster orbits.
2.) The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves.
3.) Gravity
Which physical property causes cork to float on top of water?
Escribe la configuración electrónica de los elementos que poseen, ¿de qué elementos se trata?: 15 electrones 27 electrones 56 electrones 49 electrones
Answer:
15 electrones: 1S²2S²2P⁶3S²3P³. Fósforo
27 electrones: 1S²2S²2P⁶3S²3P⁶4S²3d⁷ - Cobalto.
56 electrones: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s² - Bario
49 electrones: 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p¹ - Indio
Explanation:
Para llenar los orbitales electrónicos de los distintos átomos debemos hacer uso de la regla de llenado electrónico de Aufbau. Por ejemplo, para el átomo con 15 electrones, la configuración electrónica es:
1S²2S²2P⁶3S²3P³. 2+2+6+2+3 = 15 electrones
Si elemento es neutro, tiene 15 protones. Es decir, es el fósforo, P.
27 electrones:
1S²2S²2P⁶3S²3P⁶4S²3d⁷ - Cobalto.
56 electrones:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p⁶6s² - Bario
49 electrones:
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p¹ - Indio
A surfact that DOES NOT allow water to pass through.
Answer:
impermeable
Explanation:
Answer:
aquifer?
Explanation:
The reactants of two chemical equations are listed.
Equation 1: PbNO3 + Mg
Equation 2: PbNO3 + KI
Based on the type of reaction, which reaction can be used to extract lead metal from lead nitrate solution?
Equation 2, because K being more reactive, exchanges position with Pb in PbNO3
Equation 2, because K being more reactive, exchanges position with N in PbNO3
Equation 1, because Mg being more reactive, replaces N from PbNO3
Equation 1, because Mg being more reactive, replaces Pb from PbNO3
Answer:
Equation 2, because K being more reactive, exchanges position with Pb in PbNO3.
Explanation:
Equation 2, because K being more reactive, exchanges position with Pb in PbNO₃. PbNO₃ + KI reaction can be used to extract lead metal from lead nitrate solution. Therefore, option A is correct.
What is lead metal ?The chemical element lead has the atomic number 82 and the letter Pb for its symbol. It is a dense, hefty metal that is heavier than the majority of everyday materials. Lead is pliable and soft, and it also has a low melting point. Lead has a tinge of blue when it is first cut, and it is bright and gray. When exposed to air, it tarnishes to a drab gray tone.
Lead is still often used in a variety of products, including some solders, lead crystal glass, pigments, ammunition, cable sheathing, lifting and diving weights, and weight belts. Corrosive liquids are frequently stored in it.
The chemical element lead has the atomic number 82 and the symbol Pb. Lead is a solid at normal temperature and is categorized as a post-transition metal.
Therefore, option A is correct.
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THIS IS URGENT PLEASE HELPPPPPP (NO LINKS PLEASE)
The formula for barium chloride is BaCl2. The chemical formula for barium chloride shows the number of ___________ of each element in the ___________ representative unit of the substance.
Answer: The chemical formula for barium chloride shows the number of ATOMS of each element in the SMALLEST representative unit of the substance.
Explanation:
The chemical formula of compound are ways in which a chemical substance is being expressed using chemical symbols to show types of atoms and subscripts to indicate the number of atoms of each element. It shows the number of atoms in a single ( smallest) representative unit of the substance. Using the compound BaCl2;
"Ba" represents the abbreviation for the element "Barium" while "Cl2" represents the abbreviation for the element "chloride" with the subscript of two indicating the number of atoms of chlorine.
There are steps to be considered while writing a chemical compound of a substance, they include:
--> write the symbol of all the elements that forms the compound ( Ba and Cl).
--> write the valency of each element. (Ba has 2 valence electrons while Cl has 1 valence electron).
--> exchange the valency of the both elements such that Ba bears valency of 1 and Cl bears valency of 2 electrons.
--> finally, write the valency of second atom as subscript of first and Write valency of first atom as subscript of second. You will achieve BaCl2 as your chemical formula.
The chemical formula for barium chloride shows the number of atoms in the smallest representative unit of the substance.
Barium chloride is an ionic compound. The formula unit of an ionic compound is commonly represented by its empirical formula. The empirical formula of barium chloride is BaCl2.
This formula of BaCl2 shows the number of atoms in the smallest representative unit of the substance.
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If the student added larger drops to the pan, the
what?of the waves would increase.
Answer:
this makes no sense you arent gonna get help
Explanation:
Answer:
Amplitude
Explanation:
Im taking this test rn lol
if you have obtainted more than required amount of a solid chemical from a reagent bottle you should
A. dispose of excese as directed
b. save the excuses for the laboratory period
c. throw the excess into the nearest trash question
d. return the excess to the reagent bottle
Answer:
A dispose of excese as directed
A 2.50 L balloon is filled with water at 2.27 atm. If the balloon is squeezed into a 0.80 L beaker and does NOT burst, what is the pressure of water in the balloon?
Answer:
[tex]P_2=7.09atm[/tex]
Explanation:
Hello!
In this case, given the change in volume and pressure of the gas, it is possible for us to recall the Boyle's law as way to understand the inversely proportional relationship between pressure and volume:
[tex]P_1V_1=P_2V_2[/tex]
Thus, when solving for the final pressure, P2, given the initial pressure and volume and the final volume, we obtain:
[tex]P_2=\frac{P_1V_1}{V_2}\\\\P_2=\frac{2.27atm*2.50L}{0.80L}\\\\P_2=7.09atm[/tex]
Best regards!
Answer:
7.1 atm
Using Boyle’s law, P1 V1=P2 V2.
Which of the clouds shown would indicate a possible future rain storm?
A) A
B) B
C) C
D) D
Which watershed drains into Chesapeake Bay?
Label A
Label B
Label C
Label D
Answer:
the correct answer is label D
Explanation:
label D is the only watershed that touches the chesapeak bay
Find A in degrees. Round to the
nearest tenth.
С
a = 7
b
b = 4
a
C = 8
B
A
С
A = [?]
Answer:
61 degrees
Explanation:
How many moles of NH3 can be made from 0.93 moles N2?
0.62 mol NH3
1.86 mol NH3
0.93 mol NH3
0.47 mol NH3
Help please help!!!!
Answer:
B
Explanation:
Which of the following is the weakest type of intermolecular
force?
o Hydrogen bonding
o Induced dipole
London dispersion
o Dipole-dipole
Answer:
London Dispersion
Ethylenediaminetetraacetic acid EDTA is 41.09% C, 5.53% H, 9.58%N, and 43.8% O. What is the empirical formula of EDTA?
Answer:
41.09% B N. The formula in EDTA
Explanation:
Which of the following examples best illustrates an effect of pollution on an ecosystem?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Cutting down a forest for lumber removes available habitat for local animals, forcing them to move or compete for remaining resources.
(Choice B)
B
The number of wolves in an area declines due to urbanization and hunting, allowing elk and deer populations to grow rapidly.
(Choice C)
C
Nitrogen and phosphorus runoff from agricultural fields creates harmful algal blooms and dead zones in the ocean.
How are the concentrations of hydrogen ions and hydroxide ions related in an aqueous solution?
Arrhenius acid increases the concentration of hydrogen ion in an aqueous solution and Arrhenius base increases the concentration of hydroxide ion in an aqueous solution.
What is Arrhenius Acid and Base ?Arrhenius acid dissociates in aqueous solution to form hydrogen ion. In aqueous solution Arrhenius acid increases the concentration of hydrogen ions.
Arrhenius base dissociates in aqueous solution to form hydroxide ion. In aqueous solution Arrhenius base increases the concentration of hydroxide ions.
Hydrogen Ion [tex](H^+)[/tex] and Hydroxide Ion [tex](OH^{-})[/tex].In aqueous solution of hydroxide ions bases dissociates. Greater the concentration of base means greater the concentration of hydroxide ion. If hydroxide ion concentration is more then pH will be less.
Thus, we can say that Arrhenius acid increases the concentration of hydrogen ion in an aqueous solution and Arrhenius base increases the concentration of hydroxide ion in an aqueous solution.
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Why does energy spread out evenly if there's only a 21% chance that energy spreads out evenly?
Answer:
It has to do with increasing the entropy of the universe.
Explanation:
The modern definition of entropy is that it is the extent to which a system is able to disperse its energy. Energy (such as heat!) likes to spread itself out, so that as many states as possible are occupied with the least amount of energy.
Which molecule is a stereoisomer of trans-2-pentene?
Answer:
cis-2-pentene
Explanation : The stereoisomers are the compound which differs only in the spatial arrangement of the atoms across the stereogenic centers.
There are mainly two forms of stereoisomers cis and trans. Cis-isomers are those where the two bulky or functional groups are arranged on the same side across the stereogenic center; whereas, in trans-isomers the two bulky groups or functional groups are arranged in the opposite sides of stereogenic center.
What volume will 2.0 moles of nitrogen occupy at 0.947 atm and 20.0 °C?
Answer:
V = 50.77 L
Explanation:
Given that,
No. of moles, n = 2
Pressure, P = 0.947 atm
Temperature, T = 20°C = 293 K
We need to find the volume occupies by Nitrogen gas. Using gas law,
[tex]PV=nRT\\\\V=\dfrac{nRT}{P}[/tex]
Where
R is gas constant
Put all the values,
[tex]V=\dfrac{2\times 0.08205\times 293}{0.947}\\\\V=50.77\ L[/tex]
So, the volume occupied by the gas is equal to 50.77 L.
Which of the following diagrams represents the winter in the southern hemisphere?
Answer:
Left position
If this don't help i am sorry but i tried
Explanation:
The figure is representing the motion of revolution of the Earth around the Sun.
This motion lasts approximately 365 days (one year). Since the axis of rotation of the Earth is tilted (by about 23 degrees from the vertical), the amount of light received by different parts of the Earth at the different part of the year is different.
In fact, we observe 4 "extreme" cases:
- Situation at the bottom: here the situation is symmetrical in the two hemispheres, which receive an equal amount of light. So, we have 12 hours of daylight and 12 hours of dark at every point on Earth - this is called equinox, and it occurs in September
- Situation on the right: here we see that the Southern Hemisphere receive much more light than the Northern Hemisphere - so the Southern Hemisphere has more hours of sunlight per day. This is called winter solstice, and it occurs in December - in this case, it is summer in the Southern Hemisphere and winter in the Northern Hemisphere
- Situation at the top: here the situation is symmetrical in the two hemispheres, which receive an equal amount of light. So, we have 12 hours of daylight and 12 hours of dark at every point on Earth - this is called equinox, and it occurs in March
- Situation on the left: here we see that the Northern Hemisphere receive much more light than the Southern Hemisphere - so the Northern Hemisphere has more hours of sunlight per day. This is called summer solstice, and it occurs in June - in this case, it is summer in the Northern Hemisphere and winter in the Southern Hemisphere
Suppose that 5.2 L of methane at a pressure
of 782 Torr is transferred to a vessel of volume
2.2 L. What is the final pressure of methane
if the change occurs at constant temperature?
Answer in units of Torr.
Answer:
Final pressure = 1848.36 Torr
Explanation:
Given that,
Initial volume, V₁ = 5.2 L
Initial pressure, P₁ = 782 Torr
Initial volume, V₂ = 2.2 L
We need to find the final pressure. We know that the relationship between pressure and volume is given by :
[tex]P\propto \dfrac{1}{V}\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}\\\\P_2=\dfrac{P_1V_1}{V_2}\\\\P_2=\dfrac{782\times 5.2}{2.2}\\\\P_2=1848.36\ torr[/tex]
So, the final pressure is equal to 1848.36 Torr.
1. A cupcake show makes and delivers specialized cupcakes. It will cost someone $30 for
10 cupcakes and $67.50 for 25 cupcakes. This total includes the cost per cupcake and
delivery fee. How much does each cupcake cost? (enter your answer with just the number,
no $ sign)
Answer:
2.5
Explanation:
The given costs for the purchase and delivery of the cupcakes are;
The cost of 10 cupcakes and the delivery fee = $30
The cost of 25 cupcakes and the delivery fee = $67.50
Let 'c' represent the fixed cost of delivery of the cup cakes, and let 'x' represent the cost of each cup cake, we have;
30 = 10·x + c...(1)
67.50 = 25·x + c...(2)
Subtracting equation (1) from equation (2) gives;
67.50 - 30 = 37.50 = 25·x - 10·x + c - c = 15·x
∴ x = 37.50/15 = 2.5
The cost of each cupcake, x = 2.5
(∴ The delivery fee = 30 - 10 × 2.5 = 5)
The cost of each cupcake is 2.5.
what are the properties of gas, liquid and solid.
Explanation:
The particles in solids are tightly packed, whereas the particles in liquid move around each other. The particles in gas move around quickly in all directions. Solids can only vibrate, but liquids and gas have some space for movement,
I’m kinda stuck with this part of the paper
Answer:
oK so pay pattention to the fractions
Explanation:
What is an example of a community protecting Earth's resources? (2 points)
a
Cattle ranchers have cut down trees to create space for their cattle.
b
A town has started getting their vegetables transported from far away.
c
A mine has burned down a forest to create room for buildings.
d
A town has started a new recycling and composting program.
D. A town has started a new recycling and composting program
Answer:
D A town has started a new recycling and composting program
Explanation:
If today is October 22nd and we view a new moon, on what date will we observe the next first quarter?
a. October 5th
b. October 8th
c. October 15th
d. October 29th witch oneeee i need it done like rn
Answer:
The answer is C
Explanation:
Which wave has the highest frequency?
1
3
4
2
Answer:
Number 4
Explanation:
There are more in the line