Answer:
Endothermic and exothermic reactions are chemical reactions that absorb and release heat, respectively. A good example of an endothermic reaction is photosynthesis. Combustion is an example of an exothermic reaction. The categorization of a reaction as endo- or exothermic depends on the net heat transfer.
Explanation:
Answer:
An endothermic reaction
Explanation:
The heat is being absorbed so it's and endothermic reaction
fully explain, why each characteristic would or would not favor the formation of an amorphous solid
Answer:
Crystalline solids have regular ordered arrays of components held together by uniform intermolecular forces, whereas the components of amorphous solids are not arranged in regular arrays. The learning objective of this module is to know the characteristic properties of crystalline and amorphous solids. When cleaved or broken, they produce fragments with irregular, often curved surfaces; and they have poorly defined patterns when exposed to x-rays because their components are not arranged in a regular array. An amorphous, translucent solid is called a glass.
Please, help me
The following reagents are required for laboratory practice.
Answer:
A
Explanation:
Answer:
A is the answer for this question
Why are half-reactions used in redox reactions?
A) They make it possible to neglect the electrons that are being transferred.
B) they make it easier to keep track of spectator ions
C) They make it easier to see the oxidation and reduction parts of the reactions separately.
d) They make balancing the number of atoms in the reaction unnecassary
Answer:
c. they make it easier to see the oxidation and reduction parts of the reactions separately
Explanation:
just took the quiz :)
PLASE ANSWER NOW! How many days and hours does a lunar cycle last? A lunar cycle last ___ days and ___ hours.
Answer:
How Long Is The Lunar Cycle: Each lunar cycle lasts 27 days, 7 hours and 43 minutes. This means that the moon takes almost 28 days to complete a full orbit around the earth. Over this course, the moon goes through several phases, which alters its appearance and even the pattern of movement in the sky.
Explanation:
hope this helps plz mark brainliest
Answer:
27 days and 7 hours
Explanation:
im guessing on this one but im pretty sure its correct it also says that our moon completes the cycle in 29.5 days.
Identify the state(s) of matter that each property describes.
takes the shape of its container:
gas
liquid
solid
fills all available space:
gas
liquid
solid
maintains its shape:
gas
liquid
solid
can be poured:
gas
liquid
solid
is compressible:
gas
liquid
solid
has a fixed volume:
gas
liquid
solid
Answer:
1) takes the shape of its container ( liquid and gas).
2) fills all available space (gas)
3) maintains its shape ( solid)
4) can be poured ( liquid)
5) is compressible ( gas)
6) has a fixed volume ( liquid and solid)
Explanation:
Matter is simply defined as anything that has weight and occupies space. It exists in three states, namely: solid, liquid and gaseous states.
The properties of different states of matter includes:
SOLID STATE
--> It has a definite shape: The shape of a solid is fixed; it does not depend on the shape of other materials.
--> It has a definite volume: it occupies its own shape due to the force of cohesion among its molecules.
--> It is tightly packed: The molecular movements of particles are negligible.
LIQUID STATE
--> liquid has a defined volume.
--> it has no definite shape: There is no specific shape of a liquid. It occupies any available space. It's shape depends on the shape of the container into which it is poured.
GASEOUS STATE
--> it has no fixed shape: Due to the distance in the molecules of gas, the gaseous state has no shape. It occupies the shape of its container.
--> It has no fixed volume: it occupies the shape of any container that is closed.
--> It is highly compressible: The particles of gas are far off from one another and there is room for collision.
WILL GIVE BRAINLIEST
Choose the answer that best describes strong currents of warm, moist air rapidly rising to altitudes of 40,000 feet causing heavy rain, lightening, hail, winds, and flash flooding.
A. tornado
B. cyclone
C. thunderstorm
D. temperature inversion
What problems can temperature inversions create?
A. can create dust storms making air hard to breath
B. can cause cyclones to form
C. can cause hail, rain and high winds
D. can trap polluted air causing health problems
What are rotating air currents circulating around a vertical axis inside a supercell?
A. downdrafts
B. tornado
C. mesocyclone
D. windshear
What is a cyclone called that generates winds of 200 kmph and rotates in a counter-clockwise movement in the Pacific Ocean?
A. a typhoon in the northern hemisphere
B. a cyclone
C. a hurricane
D. a typhoon in the southern hemisphere
Answer:
1. C. thunderstorm
2. D. can trap polluted air causing health problems
3. C. mesocyclone
4. B. a cyclone
Explanation:
A temperature inversion happens as a result of warm air developing over a layer of cooler air.
A thunderstorm is a violent weather with strong winds, lightning, thunder, heavy rain fall and dense clouds. This occurs when warm air rise in an updraft to cooler atmosphere.
Answer:
1. Thunderstorm
2.can trap polluted air causing health problems
3.mesocyclone
4.typhoon in the northern hemisphere
Explanation:
Writing Chemical Equations
Write and balance the equation showing the reaction between zinc metal and aqueous sulfuric acid to form aqueous zinc sulfate, sulfur dioxide gas, and water.
Answer:
1) 1 N2 + 3 H2 2 NH3
2) 2 KClO3 2 KCl + 3 O2
Explanation:
That would help!! Stay safe
will give brainliest to correct answer
Answer:
2.5 grams
Explanation:
you can see it on the graph
g (True/false)Sodium borohydride, NaBH4, is a reducing reagent which converts carbonyl to carboxylic acids
Answer:
False
Explanation:
Sodium borohydride, NaBH4 is a reducing agent. The conversion of a carbonyl to carboxylic acids is an oxidation reaction.
Sodium borohydride, NaBH4 does not perform an oxidation reaction, it is only used for reduction reactions. Hence the statement in the question is false.
Place the following compounds in order from lowest to greatest vapor pressure. CH3CH2CH2CH3 CH3CH2OH CH3CH2CH3 NaF A B C D (Enter the letter corresponding to each compound.)
Answer:
C
Explanation:
There are 3 factors that affect the vapor pressure of a liquid, they are;
surface area
intermolecular forces and
temperature.
If we consider the options, we will notice that NaF is held together by strong ionic bonds in its crystal lattice. Also, CH3CH2OH is held together both by dispersion forces and strong hydrogen bonds.
However, CH3CH2CH2CH3 and CH3CH2CH3 are only held together by weak dispersion forces. Which of them is expected to have the weakest magnitude of intermolecular forces? We must know that larger and heavier molecules exhibit stronger dispersion forces than smaller and lighter ones.
This implies that the magnitude of intermolecular forces in CH3CH2CH2CH3 is much greater than that in CH3CH2CH3. Hence at the same temperature, CH3CH2CH3 has the greatest vapour pressure among the four substances listed in the question.
What is the molar mass of 81.50 g of gas
exerting a pressure of 1.75 atm on the
walls of a 4.92 L container at 307 K?
The molar mass of gas = 238.29 g/mol
Further explanationGiven
mass = 81.5 g
P=1.75 atm
V=4.92 L
T=307 K
Required
molar mass
Solution
The gas equation can be written
[tex]\large{\boxed{\bold{PV=nRT}}[/tex]
[tex]\tt n=\dfrac{mass}{molar~mass}[/tex]
So the equation becomes :
[tex]\tt Molar~mass=\dfrac{mRT}{PV}[/tex]
Input the value :
[tex]\tt M=\dfrac{81.5\times 0.082\times 307}{1.75\times 4.92}\\\\M=238.29~g/mol[/tex]
Answer:
239
Explanation:
The heat of vaporization of an unknown liquid is 1,340 Joules per gram. What is the minimum number of Joules needed to change 20.0 grams of the liquid to vapor at the boiling point?
Answer:
The temperature of a boiling liquid remains constant until all of the liquid has been converted to a gas.For example, the amount of heat necessary to change one gram of water to steam at its boiling point at one atmosphere of pressure, the heat of vaporization of water, is approximately 540 calories.
Explanation:
IUPAC NAME?
NH2
CH3
H2C
(0)
OCH CH3
I
H30
CH3
Answer:
Ask your chemistry teacher
Is iced coffee a solution?
nitrogen and phosphorus would form what kind of bond
Answer:
The size of a phosphorus atom also interferes with its ability to form double bonds to other elements, such as oxygen, nitrogen, and sulfur. As a result, phosphorus tends to form compounds that contain two P-O single bonds where nitrogen would form an N=O. double bond.
Explanation:
A student is performing a titration on a solution of HNO3 with an unknown concentration. They used a solution of KOH that they determined the concentration to be 8.2 x 10-2 M beforehand. They use an aliquot of 15.0 mL of HNO3 to titrate.
a. If the equivalence point is reached after the addition of 18.5 mL of titrant, what was the original pH of the analyte? [1.00]
b. What would the pH of the analyte be at the equivalence point? [You should be able to figure this out yourself!]
c. If the student over-titrates the analyte and adds 19.2 mL of titrant, what would the pH of the analyte be? [11.22]
d. If the student under-titrates and only adds 10.0 mL of titrant, what is the pH of the analyte? [1.56]
e. Draw a titration curve for this question.
The ____ are new substances that are created following a chemical reaction. *
A:chemical reactions
B:products
C:reactants
D:coefficients
Answer:
b
Explanation:
When 6.02 x 1023 is multiplied by 9.1 x 10-31, the product is
a. 5.5 x 10^-9
b. 5.5 x 104-8
c. 5.5 x10^-31
d. 5.5 x 10^-7
Answer:
D
Explanation:
^^
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the correct option is option D that is 5.5 x 10⁻⁷.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms/electrons/formula units which is also called Avogadro number
mole =given number of atoms ÷ 6.022×10²³(Avogadro number)
6.022×10²³× 9.1 x 10⁻³¹= 5.5 x 10⁻⁷
9.1 x 10⁻³¹ is mass of an electron. Firstly multiply the base then add the power.
Therefore, the correct option is option D.
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1. Show the short-hand electron configuration for Hafnium (Hf - atomic number 72), starting from [Kr].
2. What are the valence electrons for hafnium.
3. Explain why the 5d and 4f electrons for hafnium are not generally involved in chemical reactions.
Answer:
1. [tex]Hf:[Kr]4f^{14}5d^26s^2[/tex]
2. The valence electrons are 4.
3. Due to poor shielding of inner electrons.
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
The element Hafnium (Hf) has atomic number of 72 and the nearest noble gas is Krypton has 36 electrons.
The electrons are filled according to Afbau's rule in order of increasing energies.
[tex]Hf:72:[Kr]4f^{14}5d^26s^2[/tex]
As Hafnium is a d block element amd it has 2 electrons in 5d and 2 electrons in 6s.
The eletrons in 5d and 4f are poorly shielded by the inner electrons and thus experience strong nuclear charge and thus do not participate in bonding.
HELPPP PLEASEEE....
How does a glass of juice become cold when you add ice to it?
aThe ice makes the glass colder so the juice becomes colder.
bThe ice cools the glass of juice because the slow moving particles in the ice cause the particles of the juice to slow down.
cIce is colder than the juice. The cold travel from cold to warm until both items are the same temperature.
dThe juice is warmer than the ice. Heat travels in one direction until both items are the same temperature.
Answer:
C.
Explanation:
The other ones just don't make sense as answers to the question
Answer:
B
Explanation:
ice molecules move slowly and cluster tightly together, they produce a low amount of heat
what is the smallest division on 4 balance
Answer:0.1g
Explanation:
Answer: The smallest scale division is a tenth of a centimeter or 1 mm.
Explanation: I got this from a website but I hope it helps!
True or False.All matter is made up of tiny particles called atoms.
1. Why
are atoms considered the building blocks of life?
Answer:
Explanation:
Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. ... A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons.
Why are regions that receive more solar energy more likely to develop hurricanes
Explanation:
Plants are more likely to thrive in those regions. Those regions have more water evaporation. Regions that receive more solar energy are typically drier.
Which TWO trends do the data show TWO answers Giving Brainliest Explain your answer:)
Answer:
C and D
Explanation:
C: You can tell from the pattern there is obviously a cycle it is following
D: When the line spikes you can see there are multiple warm temp spikes
Answer:
C and D is the answer. Plz mark as brainliest.
Explanation:
Methane CH4 gas and oxygen O2 gas react to form carbon dioxide CO2 gas and water H2O vapor. Suppose you have 11.0 mol of CH4 and 7.0 mol of O2 in a reactor. Suppose as much as possible of the CH4 reacts. How much will be left? Round your answer to the nearest 0.1 mol
Answer:
The number of moles of CH₄ that will remain is 7.5 moles
Explanation:
Complete combustion reaction of oxygen and methane is given as;
CH₄ + 2O₂ → CO₂ + 2H₂O
comparing the number of moles of methane and oxygen in the reaction above, the amount of methane used in the reaction is calculated as follows;
2 moles of O₂ -----------> 1 mole of CH₄
7 moles of O₂ ------------> x moles of CH₄
x = 7 / 2
x = 3.5 moles of CH₄
Total moles of CH₄ in the reactor = 11.0 moles
The number of moles that will remain = 11.0 moles - 3.5 moles
The number of moles that will remain = 7.5 moles
Therefore, the number of moles of CH₄ that will remain is 7.5 moles
15 POINTS PLS ANSWER CORRECTLY AND FAST
Drag the tiles to the boxes to form correct pairs.
Read the excerpts from Mark Twain's Adventures of Huckleberry Finn.
Match each of these examples of external conflict with the type of conflich
It reflects.
1. character versus character
2. character versus nature
3. character versus society
a. Huck travels down the dangerous and
long Mississippi River.
b. Huck helps Jim, a runaway slave,
even though he knows his community
would not approve.
c. Huck stops con men named the duke and
Dauphin from cheating the townspeople.
The order it would go in is character versus nature character versus society and finally character versus character
hope this helps
The first example is that of conflict between character versus nature followed by character versus character and character versus society.
What is a conflict?
Conflict is defined as an activity which occurs between two persons who are though conscious but not rational.It is usually defined in terms of wants of a person , needs or obligations.
There are four types of conflict , 1) self conflict which is the conflict with self 2) conflict with others based on differences on opinions 3)conflict with environment in order to adjust withe the environmental problems and 4) conflict with supernatural in opposition to the belief in super natural powers.
Conflict can also be emotional,intellectual as well as theoretical,intellectual conflict is also a sub class of cultural conflict.
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Help plz:))) I’ll mark u brainliest ASAP 10 points
What element is found in group 4 and period 5?
Answer:
answering so the person who wanted brainliest can get it :D
<3
the key term which means moon blocks sunlight to the earth is
Answer:
Solar eclipses
Explanation:
7. Intermolecular forces hold the oxygen and hydrogen atoms together in a water molecule.
a. TRUE
b. FALSE
