Answer:
Exothermic
Explanation:
Combustion reactions are almost always exothermic because it is an oxidation reaction that produces heat and in this case it would be considered to be exothermic but there are few cases in which it would be considered endothermic. Combustion of Nitrogen is endothermic because Δ is positive despite being a combustion reaction.
When reactants are not used to make new substances, are they destroyed?
In a chemical reaction, only the atoms present in the reactants can end up in the products. No new atoms are created, and no atoms are destroyed. In a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.
write a ground state electron configuration for each neutral atom
Pb
Sr
U
N
Ag
Ti
Ce
CI
Hg
please help me
Answer:
Pb[lead] [Xe]4f^145d^106s^26p^2
U[uranium] 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4e^14 5d^10 6p^6
7s^2 5f^4
This notation can be written in core notation or noble gas notation by replacing the
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4e^14 5d^10 6p^6
7s^2 5f^4
with the noble gas [Rn].
[Rn]7s25f4
N[nitrogen] The full electron configuration for nitrogen is 1s^2 2s^2 2p^3.
Ti[titanium] Ti2+:[Ar]3d^2
Ti:1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2
1s^2 2s^2 2p^6 3s^2 3p^5 = 17 electrons
(1) electron gain will result to a
negative charge (−), and
(2) electron loss will result to a positive charge (+),
1s^2 2s^2 2p^6 3s^2 3p^6 = 18 electrons
Hg[mercury] You should then find its atomic number is 80. It has a Xe core, so in shorthand notation, you can include [Xe]instead of
1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^6 4d^10 5s^2 5p^6,
for 54 electrons. For the 6th row of the periodic table, we introduce the 4f orbitals, and proceed to atoms having occupied 5d orbitals. We, as usual, have the ns orbitals, and n=? for the 6th period?
Mercury has a regular electron configuration. It becomes:
[Xe]4f145d106s2
Explanation:
socratic.org helped me! I'm really sorry if this is wrong!
what happens to the 1s orbitals on the hydrogen atoms as they approach to make a covalent bond?
i dont know im only doing for points
Answer: They begin to overlap
what type of bond is between H2?
Explanation:
covalent bond enjoy your anseer
What mass of silver can be plated onto an object in 33. 5 minutes at 8. 70 A of current? Ag (aq) e- → Ag(s).
Answer:
need points sorry
Explanation:
Count the following atoms
NEED ANSWER ASAP
Answer:
2x(hn)po
Explanation:
Use the community property to reorder the terms
Remove the unnecessary parentheses
2hnpo
2hnop
use the community property to reorder the terms
2hnop
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this is the text code sir
Answer:
okay?
Explanation:
Answer:
[tex]\huge\blue{\boxed{\tt{\colorbox{black}{babyheaven}}}}[/tex]
why are there no elementary substances that have the ionic bond?
This problem is asking for the reason behind the nonexistence of elementary substances with ionic bonds. First of all, it is necessary to bear to mind that the definition of the type of bond in a compound depends on the difference electronegativity that is present between two of the atoms composing it.
For instance, in binary salts, such as KCl, NaCl, KBr and so on, we are able to know these are all ionic because they are composed by a metal and a nonmetal, which have the smallest and largest electronegativities, so that the difference electronegativity is large enough to produce an ionic bond.
In contrast, elementary susbtances, such as liquid bromine (Br2) and gases such as H2, N2, Cl2, F2 and O2, since they are all nonmetals and the same type, the electronegativity difference will be 0 and therefore, they will not be ionic but covalent.
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https://brainly.com/question/15105831https://brainly.com/question/14509196Which process releases heat?
O A. Sanding wood
O B. Baking bread
O C. Burning gasoline
O D. Frying french fries
Answer:
C
Explanation:
burning gasoline i think pls can i have brainliest if right!
Answer:French fries
Explanation:
Which of the following shows a valid combustion reaction?
Answer:
May be third one because of the formation of H2(hydrogen)on the product side.
The equation that shows the valued combustion reaction is [tex]C_2H_4 + 3O_2 \rightarrow 2CO_2 + 2H_2O[/tex]
The following information should be considered:
For [tex]2Al + 2O_2 \rightarrow 2AlO + O_2[/tex] it should not Balanced Properly [tex]2Al + O_2 = 2AlO[/tex] For [tex]2CH_4 + O_2 \rightarrow 2CO + 4H_2[/tex] as CO should be [tex]CO_2[/tex] For [tex]Ca + O_2 \rightarrow CaOH[/tex] it should Not Balanced and No source for the H.Learn more: brainly.com/question/16911495
why can't plants photosynthesise in winter and drought
Answer:
Because there is no water and they restore their food.
Explanation:
Like their glucose and that's why they also the leaf changes color
The difference between Physical/Chemical properties and Physical/Chemical changes
Physical changes can be reversed and chemical changes can’t be reversed. A physical property is a characteristic which can be identified without changing the substance but to identify a chemical property, you do have to change the substance.
How does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed?
А. the value of q is negative
B. the value of q is positive
C. the value of q remains constant OD. the value of a decreases
E. the value of q equals zero
Answer:
the value of q is negative
Antoine Lavoisier was able to show that mass wasn't lost or destroyed during chemical reactions by weighing all of the matter in the system before and after reactions occurred. What questions would you ask Lavoisier about how he conducted his investigations?
Answer: we can ask simple qs like was it a fair experiment and what he was actually looking for. Other qs include his variables use and that how he has maintained the experiment. Finally we could ask him for his outcome and what it would ahve changed in the near future
Explanation:
which electron carrier is not mobile or diffusible in the mitochondrial electron transport chain?
Answer:
FAD is the correct answer
Explanation:
pls choose it as the brainiest answer
What is the type of potential energy that develops as the object changes shape
Answer:
The answer is Elastic Potential Energy
A chemist has dissolved a certain substance in water. The chemist knows that more of the substance could be dissolved into the water before it stops dissolving. Therefore, the current solution is
.
Answer is: the current solution is unsaturated.
Unsaturated solution means that more of a substance can be dissolve.
For example:
Solubility of potassium chlorate (KClO₃) at 100 grams of water at 80°C is 37.5 g, that means that all 37.5 g is completely dissolves, this is the saturated solution.
If we add 20 grams of potassium chlorate in 100 grams of water, there is less solute than the saturated solution, so this is unsaturated solution.
An element has 3 electrons, 3 protons and 4 neutrons. What will be its atomic number and mass number? (
Answer:
its atomic number will be 3 and it's mass number will be 7. it is lithium
Excited hydrogen atoms emit light in the ultraviolet at 2.47x1015Hz. What is the
energy of a single photon with this frequency?
The energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
Using Planck's equation, the energy of the photon E = hf where h = Planck's constant = 6.63 × 10⁻³⁴ Js and f = frequency of ultraviolet light = 2.47 × 10⁻¹⁵ Hz.
Substituting the values of the variables into the equation, we have
E = hf
E = 6.63 × 10⁻³⁴ Js × 2.47 × 10¹⁵ Hz.
E = 16.3761 × 10⁻¹⁹ J
E = 1.63761 × 10⁻¹⁸ J
E ≅ 1.638 × 10⁻¹⁸ J
So, the energy of a single photon of this frequency is 1.638 × 10⁻¹⁸ J
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Which over lappings are present in carbon(iv)oxide molecule
Answer:
the double carbon to oxygen bond
What type of rays result in shorter days? (science)
Answer:
verical rays
Explanation:
The rays result in shorter days are the vertical rays.
What are vertical rays ?Vertical rays are another name for direct rays. Rays that are straight overhead are referred to as vertical. Because the Earth is spherical, not all the Sun's rays hit it directly or vertically.
Vertical rays lose less heat because they cover a shorter distance. Slanted rays cover more ground and dissipate more heat. Sun's vertical rays fall between the Tropics of Cancer and Capricorn, along its migratory belt.
The length of a day is determined by the Earth's rotation around its axis, which has been accelerating during the past several decades. Our days have been becoming shorter due to this tendency.
Thus, vertical rays are responsible for shorter days.
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Choose the incorrect statement from the following:
(a) The disadvantage of natural gas is that it can not be used directly for burning in homes.
(b) Natural gas is stored under high pressure as compressed natural gas.
(c) Natural gas cannot be used for power generation.
(d) It is difficult to transport natural gas through pipes.
Answer:
d
Explanation:
Generally, it is transported through pipes so I think statement d is incorrect.
What change will occur if liquid gallium is removed from a hand
Answer:
Gallium's melting point is low enough that it can be melted in the human hand and then refrozen if the hand is removed. The liquid metal has a significant propensity to supercool below its melting/freezing points when exposed to high temperatures.
Explanation:
Hope it helps:)
the protein’s specific sequence is?
Answer:
The linear sequence of amino acids within a protein is considered the primary structure of the protein. Proteins are built from a set of only twenty amino acids, each of which has a unique side chain. The side chains of amino acids have different chemistries.
Hope this helps
How many molecules are in 0.79 moles of NH4?
Answer:
14
Explanation:
what are valence electrons? why are they so important in chemistry?
Answer:
Valence electrons are negatively charged particles located in the outermost shell of atoms that can be transferred or shared with other atoms. Valence electrons are important in chemistry because the number of valence electrons in a particular atom can be used to determine how the atom will react chemically with other atoms.
Put the substance in a 25 mL beaker.
Now, observe and record the following:
state of matter:
appearance and texture:
crystalline structure:
Answer:
liquid no not a solid
Explanation:
When you put the substance in a 25 mL beaker. then the state of matter is solid, appearance and texture are powdered and crystalline structure is not solid(powder).
What are crystalline structures and states of matter?The term "crystalline structure" refers to the arrangement of atoms, ions, or molecules in a crystalline solid. A crystalline solid is a type of material where the constituent particles are arranged in a regular, repeating pattern. This regular arrangement results in a characteristic geometric shape for the crystals. Examples of crystalline solids include salt, sugar, and diamond.
On the other hand, the term "state of matter" refers to the physical form in which matter exists. There are three primary states of matter: solid, liquid, and gas.
Solids have a definite shape and volume and their constituent particles are held tightly together by strong intermolecular forces.
Liquids have a definite volume but no definite shape, and their constituent particles are held together by weaker intermolecular forces.
Gases have no definite shape or volume, and their constituent particles are far apart and move freely.
Other states of matter, such as plasma and Bose-Einstein condensate, also exist but they are less common in everyday life.
Therefore, the state of matter: is solid, its appearance and texture: are powdered, and the crystalline structure: is not solid.
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What type of flower structures do you see in a ovary in a flower
Answer:
The ovary contains ovules
Explanation:
N2 + O2 → N205
how do i show my work im trying to balance the equation
Answer:
2N2 + 3O2 –2N2O3 this what I got balancing though
why does C10H22 not conduct electricity
Answer:
Decane doesn't have any free electrons because all the electrons of carbon is used for bonding.