D. The surroundings absorb 15 kJ of potential energy.
Further explanationChemical bonds = potential energy
ΔH reaction from bond energy is a breaking and forming reaction of the 2 reacting molecules
Can be formulated:
ΔH rxn = ∑ the energy of the reagent bonds broken - ∑ the energy of the bonds formed by the product
The bond energy of the products is 67 kJ and reactants 52 kJ
[tex]\tt \Delta H_{rxn}=52-67=-15~kJ[/tex]
ΔH = negative ⇒The reaction is exothermic(releases heat to surrounding)
Answer:
C is right
Explanation:
Which among the given combinations below represent a set of isotopes?
1.40 protons and 40 neutrons
II. 41 protons and 39 neutrons
3.42 neutrons and 48 protons
4 40 protons and 42 neutrons
V. 41 protons and 40 neutrons
A. I, II, III
B. III, IV
C.1, IV and II, V
D. 1, V and II. V
E.1. V
Look for the ones with the same number of protons and different neutrons number
What do we call the study of matter and how matter changes?
Answer:
Explanation:
Chemistry is the study of matter and the changes that matter undergoes. Matter is anything that has mass and takes up space.
A student inflates a balloon with helium then places it in the freezer. The student should expect
the balloon's volume to increase
the balloon's volume to decrease
the balloon's moles to decrease
the balloon's moles to increase
An object with a mass of 15 kg has an acceleration of 3 m/s/s. What is the force
applied to the object? *
45 N
5N
18 N
Answer:
45N
Explanation:
force=mass×acceleration
2. The new element Odessium (Od) was discovered in 2020 by Mr. Green. It has three isotopes: Od-284
(34.60%), Od-285 (21.20%), and Od-288 (44.20%). What is its average atomic mass?|
Answer:
Odessium (Od) has an average atomic mass of 284.45
Explanation:
Average mass is calculated from the isotopes of an element weighted by their relative abundance.
To calculate the relative average mass, you need to find the % of each isotope and use these to calculate the relative average mass
(34.60 %)/100 x 284=96.73(21.20 %)/100 x 285=60.42(44.20 %)/ 100 x 288=127.296Add all 3 answers to get the relative average mass
96.73 + 60.42 + 127.296= 284.45Lily feels tired and weak in the evenings after work. Before starting her chores, she eats dinnner. Which characteristic of life does Lily Exhibit?
Answer:
cool
Explanation:
What was the average speed of the truck for this trip?
in what and what no energy is used?
Answer:
Energy is used when someone is climbing while energy is not used when someone is going down the slope
Describe the “Doppler Effect.” Explain how it is used in Astronomy in term of red shift and blue shift
Answer:
This apparent change in the pitch (or frequency) of sound is called Doppler shift. ... You see these stretched-out light waves as having a lower frequency. Since red is at the low-frequency end of the visible spectrum, we say that light from a receding star is shifted toward red, or red shifted.
Explanation:
Freezing point
Where would you place this property in the Venn diagram?
How much valence electrons does xenon have
8 valence electrons.
After filling up all the rings, Xenon has 8 electron in the very outer ring
Answer:
hope thiss will helps u
Explanation:
8 valence electrons
There are a total of 22 valence electrons in the Lewis structure for XeF2. The Lewis structure for XeF2 is a bit tougher since you have to take formal charges into account to find the best Lewis structure for the molecule. Remember that Xenon can have more than 8 valence electrons.
Which is the larger atom S or K
Answer:
I'm pretty sure k
Explanation:
I'm not for sure I'm trying to help
Answer:
Potassium
Explanation:
Atomic size decreases across a Period, from left to right as we face the Table, and INCREASES down a Group, a column of the Periodic Table.
2. How does friction effect speed?
Answer:
It acts as a force upon it like in newtons first law of motion an object in motion will stay in motion until a force acts upon it So friction bascicallly slows it down or stops it completly
Explanation:
As the atomic number of elements increases across a period on the periodic table, the atomic radius
Answer:
Decreases
Explanation:
In Natural selection, individuals whose unique characteristics are well-suited for an environment tend to survive and produce more offspring. true or false?
Answer: True
Explanation:
why is soaking necessary for seed germination
Answer:
Explanation:
well it needs water like us to stay alive
What can you infer is causing the cryosphere to change?
Answer:
Explanation:
The cryosphere—the portion of the Earth's surface where water is in solid form for at least one month of the year—has been shrinking in response to climate warming. ... The important outcome, however, is the change and the response the human social system (infrastructure, food, water, recreation) will have to that change.
The cryosphere the portion of the Earth's surface where water is in solid form for at least one month of the year has been shrinking in response to climate warming.
What is cryosphere ?The cryosphere includes all of the earth's frozen water, including glaciers and sea ice.
The lithosphere is the solid part of the earth made up of rocks, minerals, and other elements except the ocean. It is the part which present in the outer part of the earth which includes the brittle upper portion of the mantle and crust. The part of planet where living things can be found from the upper part of the atmosphere to the lower of the oceans and pools that are thermal and made up of the parts of earth where life present in all ecosystem is known as biosphere.
The atmosphere is the thin layer of gases that covers the outer part of the planet. It gives us the many different climates, or broad way of weather conditions around the world. The hydrosphere includes all of the water on earth from the oceans to glaciers and underground water and it can be liquid, vapour, or ice.
Therefore, the cryosphere the portion of the Earth's surface where water is in solid form for at least one month of the year has been shrinking in response to climate warming.
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I don't know what I'm supposed to do, can someone explain this to me please???
Answer:
You would just put the definition and what it means im pretty sure
Explanation:
I hope this helps!!
is beeswax a mineral, a rock or neither
Answer:
niether
Explanation:
Beeswax is neither a mineral nor a rock it is supposed to be a heterogenous mixture.
What are minerals?
Minerals are defined as a chemical compound which has a well -defined composition and possesses a specific crystal structure.It occurs naturally in the pure form.
If a compound occurs naturally in different crystal structure then each structure is considered as a different mineral.The chemical composition of a mineral varies depending on the presence of small impurities which are present in small quantities.
Some minerals can have variable proportions of two or more chemical elements which occupy equivalent position in the crystal structure.It may also have variable composition which is split into separate species.
Physical properties of minerals include color,streak, luster,specific gravity and cleavage.
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An antacid tablet contains 640.0 mg of magnesium oxide per tablet.
What volume of 0.1000 M stomach acid (HCI) could one tablet neutralize?
Answer:
317.6 mL
Explanation:
Step 1: Write the balanced neutralization equation
MgO + 2 HCl ⇒ MgCl₂ + H₂O
Step 2: Calculate the mass corresponding to 640.0 mg of MgO
The molar mass of MgO is 40.30 g/mol. The moles corresponding to 640.0 mg (0.6400 g) of MgO are:
0.6400 g × (1 mol/40.30 g) = 0.01588 mol
Step 3: Calculate the moles of HCl that react with 0.01588 moles of MgO
The molar ratio of MgO to HCl is 1:2. The moles of HCl are 2/1 × 0.01588 mol = 0.03176 mol
Step 4: Calculate the volume of 0.1000 M HCl that contains 0.03176 moles
0.03176 mol × (1 L/0.1000 mol) = 0.3176 L = 317.6 mL
Which organelle is marked with an X?
The smallest possible particle of an element is a(n)
RE
??
Answer:
An atom is the smallest particle of an element that still has the properties of that element. Atoms, in turn, are composed of subatomic particles, including negative electrons, positive protons, and neutral neutrons. The number of protons in an atom determines the element it represent
Explanation:
A substance is examined under a high-power electron microscope. The substance is found to contain only one type of atom.
What is the substance?
compound
O element
mixture
solution
Answer:
It is a solution
Explanation:
I know that because a solution is something you mix and you have to use a microscope if you really wanna see what's in there
KEEP GETTING THIS WRONG PLZ HELP
Answer:
1 224.24242 kg/ m to the 3rd power
What do most mineral on Earth's surface contain?
Answer:
Explanation:
shallow sea
A shallow sea is best choice, although both are evaporites and would most likely be formed as either the sea evaporated, or in a playa setting (dry lake bed in a desert)
Answer:
oxygen and silicon
Explanation:
https://courses.lumenlearning.com/earthscience/chapter/minerals-and-mineral-groups/
"Nearly all (98.5%) of Earth’s crust is made up of only eight elements – oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium – and these are the elements that make up most minerals."
Of available answers:
a) nitrogen and oxygen
b) sulfur and hydrogen
c) silicon and nitrogen
d) oxygen and silicon
Only oxygen and silicon are both included on the list
Will give Brainiest if you can answer fast
Answer:
280 m/s
Explanation:
what can i do to change the material like metal clothes line or washing line
I'm not sure bro but i will try for you
If 116 g of butane burns in the presence of 320. g of oxygen how much carbon dioxide will be produced? CO2 produced in grams
Answer:
270.77 g of CO2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2C4H10 + 13O2 —> 8CO2 + 10H2O
Next, we shall determine the masses of C4H10 and O2 that reacted and the mass of CO2 produced from the balanced equation. This can be obtained as follow:
Molar mass of C4H10 = (12×4) + (10×1)
= 48 + 10 = 58 g/mol
Mass of C4H10 from the balanced equation = 2 × 58 = 116 g
Molar mass of O2 = 2 × 16 = 32 g/mol
Mass of O2 from the balanced equation = 13 × 32 = 416 g
Molar mass of CO2 = 12 + (16×2)
= 12 + 32 = 44 g/mol
Mass of CO2 from the balanced equation = 8 × 44 = 352 g
Summary:
From the balanced equation above,
116 g of C4H10 reacted with 416 g of O2 to produce 352 g of CO2.
Next, we shall determine the limiting reactant. This can be obtained as follow:
From the balanced equation above,
116 g of C4H10 reacted with 416 g of O2.
From the above, we can see that a higher mass of O2 i.e 416 g than what was given i.e 320 g his needed to react completely with 116 g of O2. Therefore, O2 is the limiting reactant and C4H10 is the excess reactant.
Finally, we shall determine the mass of CO2 produced from the reaction.
In this case, we shall use the limiting reactant because it will give the maximum yield of CO2.
The limiting reactant is O2 and the mass of CO2 produced can be obtained as follow:
From the balanced equation above,
416 g of O2 reacted to produce 352 g of CO2.
Therefore, 320 g of O2 will react to produce = (320 × 352)/416 = 270.77 g of CO2.
Thus, 270.77 g of CO2 were obtained from the reaction.
What is the precise volume of the liquid
Which is the larger atom As or P
Answer:
I think that As is larger