Answers
Answer:
chemistry
Explanation:
Related Questions
when molecules move they react by cooling down.
True or False?
Answers
Answer:
false
Explanation:
when molecules move they heat up
Use the equation below to solve the problem that follows.
2H2 (g) + O2 (g) → 2H2O (g)
When David reacts 13.8 grams of hydrogen gas with excess oxygen, 87.0 grams of water are formed. Calculate his percent yield of water.
Answers
Answer: 142.8%
Explanation:
13.8g H2 * (1 mol H2 / 2 g H2) * (2 mol H2O/ 2 mol H2) * (18 g H2O/1 mol H2O) = 124.2 g H2O
we just calculated our theoretical amount that should be formed and we are given the actual
percent yield: actual/theo * 100% = 124.2/87 * 100% = 142.8%
Use the drop-down menus to identify the order of these images for the formation of our solar system.
Answers
Answer:
Explanation:
What happens to the energy release of an exothermic reaction?
1.It increases the bond energy of the reactants.
2.It is released to the surroundings.
3.It raises the temperature of the reactants.
Answers
Answer:
2.It is released to the surroundings.
Explanation:
In an exothermic reaction, the energy released is to the environment. At the end of the reaction, the surrounding becomes hotter than the system where the reaction is taking place.
Heat is liberated to the surrounding in an exothermic change. At the end of this change, the surrounding becomes hotter. Examples are combustion, dissolution of substances, etc.Which of these are significant problems with bottled water?
Immense plastic use
Fossil fuel used to transport water
Water bottles can leach toxics into water
All of the above
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Answer:
All the above
Explanation:
All the above
Can be a solid,liquid,or gas A)Metal B)Nonmetal C)Both
Answers
Answer:
I think it's B. Nonmetal
(I'm so sorry if it's wrong)
Hope this Helps!
Answer:
I personally think it's both I'm sorry if this is wrong
Consider the reaction.
Upper H subscript 2 upper o (g) plus upper C l subscript 2 upper O (g) double-headed arrow 2 upper H upper C l upper O (g).
At equilibrium, the concentrations of the different species are as follows.
[H2O] = 0.077 M
[Cl2O] = 0.077 M
[HClO] = 0.023 M
What is the equilibrium constant for the reaction at this temperature?
0.089
0.26
3.9
11
Answers
Answer:
The value of Equilibrium constant for the given reaction is 0.089
Explanation:
The given data shows the following reaction
H2O (g) + Cl2O (g) ⇄ 2 HClO (g)
The above reaction is in equilibrium.
Equilibrium constant K = [tex]\frac{[C]^c*[D]^d}{[A]^a*[B]^b}[/tex]
for the reaction
aA+bB ⇆ cC +dD
so
K = [tex]\frac{[HClO]^2}{[H2O][Cl2O]}[/tex]
= [tex]\frac{[0.023]^2}{[0.077][0.077]}[/tex] = 23*23/77*77 = 0.089
Therefore the value of Equilibrium constant for the given reaction is 0.089
Answer:
The value of Equilibrium constant for the given reaction is 0.089
How many atoms of each element are in one molecule of 2-heptanone
Answers
Answer:
A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The 2-HEPTANONE molecule contains a total of 21 bond(s) There are 7 non-H bond(s), 1 multiple bond(s), 4 rotatable bond(s), 1 double bond(s) and 1 ketone(s) (aliphatic).
Answer:
Explanation:
CH3 provides 1 Carbon
C4 provides 4 carbons
COC provides 2 more
Total 7 Carbons
======================
COCH3 Provides 1 Oxygen
======================
CH3 provides 3 Hydrogens
C4H8 provides 8 hydrogens
COCH3 has 3 more hydrogens
Total 14 hydrogens
The answer should be B.
You should note that there are no brackets which means you only need to read the small numbers going down behind each element. You might have to read that sentence a could of times, but it is important to know.
An electron jumps down from the fourth energy level to the first energy level and releases a light wave of 10.8 nm in wavelength. Determine the energy level value for the fourth energy level for the atom
Answers
Answer:
-20.2 * 10^-18 J
Explanation:
From;
E = hc/λ
h= planks constant = 6.6 * 10^-34 Js
c= speed of light = 3 * 10^8 ms-1
λ = wavelength = 10.8 * 10^-9 m
Substituting values;
E = 6.6 * 10^-34 * 3 * 10^8/ 10.8 * 10^-9
ΔE = -1.8 * 10^-17 J
But for ground state E1=−13.6eV or -2.176 * 10^-18 J
From;
ΔE = E4 - E1
E4 = ΔE + E1
E4 = (-1.8 * 10^-17) + (-2. 176* 10^-18)
E4 = -20.2 * 10^-18 J
:answer question number 8
Answers
Answer:
Weight
Explanation:
Weight changes because the moon's gravity is different from the Earth's. Mass is always the same. Volume remains the same. Density also remains the same. Hope my answer is correct! If there is a lot of explanation, you can give a brainliest to my answer.
in any study of energy, energy conversion is not important. true false
Answers
Answer:
I think its false
Explanation:
Any energy is important
Hope this helps <3
Answer:
In any study of energy, energy conversion is not important. Heat energy that is lost cannot usually be used to produce work.
Explanation:
Hope this helps!
If so, please mark BRAINLIST!!
thx
which statement is true of the particles that make up a substance?
a. Particles in a liquid and particles in a solid have the same amount of energy
b. Particles in a solid have more energy than particles in a gas
c. Particles in a gas have more energy than particles in a liquid
d. Particles in a liquid have more energy than particles in a gas.
Answers
Answer: particle in gas have more energy than the particles in a liquid
Explanation: this is because the amount of energy is directly proportional to how random the system is. gaseous molecules are in a more constant random motion than the liquid molecules
Describe how the molecular models you assembled are similar to real molecules.
They model how real molecules are.
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Answer:
Atoms models are bigger but they don not match the true or positive way of atoms. to make them visible scientists make their models that resembled with the real ones.
Explanation:
Molecules are microscopic entities and only can be seen under a microscope.
How can a mixture be separated?
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Answer:
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
electronegativities of elements from Period 3 and Group 17. Fill in the missing values in the table so you can compare the electronegativities of the elements. After the table is filled in, compare the values in each column. A = B = C =
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Answer:
A = 3.16
B = 1.31
C = 0.93
Explanation:
Identify the major force between molecules of pentane and hexane
Answers
Answer:
induced-dipole induced dipole forces.
Explanation:
Explain what it means to have a positive percent error value and a negative percent value.
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Answer:
The error of an experiment is the difference between the experimental and accepted values. If the experimental value is less than the accepted value, the error is negative. If the experimental value is larger than the accepted value, the error is positive.
Explanation:
I hope that helped if it did mark me brainlest! i really need it :(
What is Constituent Element?
Answers
Answer:
hope it helps...
Explanation:
a constituent element, material, etc.; component. a person who authorizes another to act in his or her behalf, as a voter in a district represented by an elected official. Grammar. an element considered as part of a construction. Compare immediate constituent, ultimate constituent.
If this helped please comment...
With a partner, look at the stone bricks used to build this building and think about how they changed over time. What caused them to change? Do you think these changes occurred quickly or slowly? Explain.
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Answer:
Chemical WeatheringSlowlyExplanation:
Building bricks deteriorate overtime due to chemical weathering from moisture constantly in contact with it overtime, as well temperature changes. Their topmost layers leach after continuous attack, and are eroded. thereby causing them to break away most times.
This cycle takes place overtime and is not a quick action.
I hope this is easy to understand.
Select all that apply. Using your periodic table of the elements which chemical symbols indicate an element?
Question 5 options:
O
I
i
Ca
Answers
Answer:
O, I, Ca
Explanation:
In geotropism, give examples of a positive and a negative response in a seedling?
Answers
Answer:
I don't know that question answer because I am in 7 class so mind it
Answer:
Positive Geotropism means growth of the plants towards the Gravitational force. e.g.It means When a plant's root grows towards Gravitational force . It is positive geotropism. Negative Geotropism means growth of the plant against the Gravitational force. e.g. When a plant's steam grows towards sunlight.
Explanation:
Which of these is an example of a physical change?
O a banana ripening in the air
hydrogen burning in the air
zinc reacting with an acid
O liquid water turning into vapor
Answers
water into vapor is the answer
Answer:
liquid water turning into vapor
Explanation:
because physical changes alter only the size
An atom of an element has 2 electrons in the 1st energy level and 5 on the 2nd energy level what element is it ?
Answers
the element is nitrogen
5+2=7
how would one convert 36 yd to centimeters?
Answers
Answer:
3291.84 cm
Explanation:
you would multiply the amount of yards you have by 91.44, since that's how many centimeters there are in 1 yd.
Answer: it’s D
Explanation:
why organic compounds have a slow rate of reaction
Answers
Answer:
first help me plz plz
Explanation:
coz i hate chemistry
5. Name the compound which contain Strontium, Fluorine, and Oxygen.
Options:
Strontium fluorate
Strontium fluoride
Strontium chlorate
Strontium fluorine
Which event most likely occurs at point V?
cooling
erosion
heating
melting
Answers
Answer: cooling
Explanation:
Answer:
cooling
Explanation:
WILL GIVE BRAINLIEST Pam and Caroline determined the mass and volume of a piece of metal to be 34.16 g and 11.3 mL respectively. Determine the density of the metal. (Please show work and use significant figures.
Answers
Answer:
0.303kg/m
Explanation:
Density=m/v where m is mass
and v is volume
we then convert m in grams to kg
= 34.16/1000
=0.0342kg
converting ml to m
=11.3/100
=0.113m
then density=0.0342/0.113
=0.303kg/m
How do I find the formula for Phosphorus Tetroxide
Answers
You are going to want to flip the elements subscripts with one another.
P6O4
P will just stay as phosphorus, but since oxygen has 4 atoms, itbwill become tetroxide
How to do this question plz answer me
Answers
Answer: Ionic
Explanation: It is a type of chemical bond that generates two oppositely charged ions.
Which gas is made from more than one element?