Answer:
a
Explanation:
hopes this helps ______Г×××××××××××××××/Answer:
b
Explanation:
its not d bc no hypothesis was made
What is the atomic number of Argon
Answer:
18
Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas.
Explanation:
hope the answer was helpful......
Which of the following CANNOT be determined by looking at the spectra of a star? *
A:temperature
B:composition (the elements that make up the star)
C:movement toward or away from Earth
D:distance from Earth
Answer:
A:temperature
Explanation:
The temperature cannot be determined by looking at the spectra of the star due to lack of the equipment for its measurement. On the other-hand, the remaining statements like the distance from earth, movement towards or away from earth can be determined.
Write the expression for the equilibrium constant for this reaction. 2N205(g) <==> 4N02(g) + 02(g)
Answer:
K = [NO₂]⁴[O₂] / [N₂O₅]²
Explanation:
Based on the chemical equilibrium reaction:
2 N₂O₅(g) ⇄ 4NO₂(g) + O₂(g)
The equilibrium reaction is obtained as the ratio between the multiplication of the concentrations of the reactants over the products powered to its reaction coefficient. That is:
K = [NO₂]⁴[O₂] / [N₂O₅]²Find the formula for a hydrate (salt containing water) which is 55.2% NiSO4, and 44.8% H20.
The formula for a hydrate : NiSO₄. 7H₂O
Further explanationGiven
55.2% NiSO₄, and 44.8% H₂O
Required
The formula
Solution
MW NiSO₄ = 154,75 g/mol
MW H₂O = 18 g/mol
Mol ratio :
NiSO₄ : 55.2 : 154,75 g/mol = 0.357
H₂O : 44.8 : 18 g/mol = 2.49
Divide by 0.357 :
NiSO₄ = 0.357/0.357 = 1
H₂O = 2.49/0.357 = 7
How many grams of CO2 gas are produced if 48
grams of CH4 gas are consumed?
Answer:
CH4 +2 O2 — CO2 +2 H2O
Now we see that for 1 mol i.e. 16 grams of methane results in 1 mol of CO2 or 44 grams of CO2.
That means for 3 moles of methane , we will obtain 3 moles of CO2 OR for 48 (3*16) grams of CO2 , we will obtain (44*3) 132 grams of CO2 .That's it….
Explanation:
hey .dude hope the answer was helpful ....
how many grams of CO2 can be produced from the combustion of 10 moles of O2? please anwser soon
original question; If you have 10 moles of oxygen (O2), how many grams of CO2 are produced during this combustion? Solve and record your answer
using this equation
C3H8+502->3CO2+4H2O
Answer:The first thing you need to do is to write the correctly balanced equation for the combustion of C2H2.
2C2H2 + 5O2 ==> 4CO2 + 2H2O ... balanced equation
Next, we find which reactant, if any, is limiting. There are several ways to do this, but one easy way is to find moles of each reactant, and divide that value by the coefficient in the balanced equation and see which is less.
For C2H2, we have...
1.26 g x 1 mole/26.04 g = 0.0484 moles C2H2 (÷2 = 0.0242)
For O2, we have...
3.39 g O2 x 1 mol/32 g = 0.1059 moles O2 (÷5 = 0.0211) <- This is less than 0.0242 so it is limiting
Next, we use the moles of the limiting reactant (0.1059, not 0.0211) to find moles and then grams of CO2:
0.1059 moles O2 x 4 moles CO2/5 mole O2 x 44 g CO2/mole CO2 = 3.73 g CO2
Explanation:
What changes are happening to the particles as it changes state from a liquid to a gas?
(There may be more than one correct answer)
A.The particles will disappear
B. There is more kinetic energy
C. There is less kinetic energy
D. The particles are filling the entire space of the room
Which tool would be the best tool to measure the volume of water absorbed by a sponge?
Answer:
The tool is called Graduated cylinders
If the mass of the object below is 28g, what is the density of the object below. Units are in cm below. Please round your answer to the hundredths place. Зcm 2cm 5cm
Answer:
d = 0.93 g/cm³
Explanation:
Given data:
Mass of object = 28 g
Volume of object = 3cm×2cm×5cm
density of object = ?
Solution:
Volume of object = 3cm × 2cm ×5cm
Volume of object = 30 cm³
Density of object:
d = m/v
by putting values,
d = 28 g/ 30 cm³
d = 0.93 g/cm³
need help fast !!!!!!!
Answer:
Brittle
Explanation:
because thas for non metals
How much would the kinetic energy of an object decrease if you reduced its speed in half but not its mass?
Answer:
In half it would go twice as far but the effect of lost kinetic energy is lessened.( I could be wrong)
If the speed of an object is reduced to half then, the kinetic energy decreases to one-fourth of the initial value.
What is kinetic energy?Kinetic energy is the energy generated by virtue of motion of a body. Kinetic energy is directly proportional to the mass and square of the speed of the body.
The equation for kinetic energy is written as [tex]K = \frac{1}{2} mv^{2}[/tex] . Thus kinetic energy increases by four folds if we increase speed by double.
Now, if speed reduced to half that is, v changes to v/2 then, the term in equation becomes v²/4. Hence, kinetic energy decreases to one by fourth of its initial value.
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Describe in your own words the structure of solid sodium chloride, and explain why its formula is NaCl.
The structure of solid Sodium chloride can be described as a giant ionic structure and the formula is NaCl, to show that for every sodium atom their is a chloride atom.
Meaning of Sodium chlorideSodium chloride is mostly known as salt, though sea salt contains other chemical salts).
it has a giant ionic structures which does not only denote big structure, but the capacity to possess billions of atoms.
Sodium chloride is an ionic compound with a chemical formula of NaCl, which represents that the ration of sodium to chloride is one ratio one (1:1)
Soduim chloride has been used in so many ways by man which includes: salt for food, ice removal from roads, osmosis enhancer etc.
In conclusion, The structure of solid Sodium chloride can be described as a giant ionic structure and the formula is NaCl, to show that for every sodium atom their is a chloride atom.
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Imagine that you helped to discover a new element; A=302;Z=119. How many protons, electrons, and neutrons are in each atom it this element?
Explanation:
Given that,
Mass number, A = 302
Atomic number, Z = 119
We know that, atomic number = no of protons
Protons = 119
Mass no. = No. of neutrons + No. of protons
302 = No. of neutrons + 119
No. of neutrons = 302 - 119
= 183
No. of electrons = No. of protons
= 119
helpppp plzzzzzz it's due Monday :(
A) B) C) D) E) F) G)
H) I) J) K) L) M) N)
O) P) I need to identify whether they are compounds, elements, mixtures, a mixture of compounds, a mixture of elements, or a mixture of compounds & elements
Answer: but thx for the points
Explanation:
A compound is 75.46% Carbon, 4.43% hydrogen and 20.10% Oxygen by mass. it has a molecular weight of 318.31g/mol. what is the molecular formula of the compound?
Answer:
No.of moles of C is , n = mass/molar mass = 75.46 g / 12 (g/mol) = 6.3 moles No.of moles of H is , n' = mass/molar mass = 4.43 g / 1.0(g/mol) = 4.43 moles No.of moles of O is , n'' = mass/molar mass = 20.10 g / 16(g/mol) =1.25 moles Ratio to the no.of moles of C,H& O is 6.3 : 4.43 : 1.25 In the simple integer ratio is ( 6.3/1.25) : ( 4.43/1.25) : (1.25/1.25) 5.04 :3.5 : 1
Explanation:
We have that the Molecular Formula is
[tex]C_{20}H_14O_4[/tex]
From the Question we are told that
75.46% Carbon
4.43% hydrogen
20.10% Oxygen
molecular weight of [tex]318.31g/mol.[/tex]
Generally
Moles of Hydrogen
[tex]M_c=\frac{75.46}{12}\\\\M_C=6.28\\\\M_C=\frac{6.28}{1.256}\\\\M_C=5[/tex]
[tex]M_C=\frac{4.43}{1}\\\\M_C=4.43\\\\M_C=4.43/1.256\\\\M_C=3.5[/tex]
[tex]M_c=\frac{20.10}{16}\\\\M_C=1.256/1.256\\\\M_C=1[/tex]
Therefore
Empirical Formula
[tex]C_{10}H_7O_2[/tex]
Where
[tex]n=\frac{318.31g}{159}[/tex]
n=2
Molecular Formula
[tex]C_{20}H_14O_4[/tex]
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Does a physical separation break intermolecular or intramolecular bonds?
Answer:
Intermolecular bonds
Explanation:
Physical separation is known to break intermolecular bonds. Intermolecular bonds are the bonds between molecules of a substance.
These attractive forces between molecules determines the intermolecular interactions.
Chemical changes takes place between the intramolecular bonds. Intramolecular bonds are found between atoms of a substance. These bonds are the ones that forms new compounds when a product results in a chemical reaction.
Physical separation deals with intermolecular forces of attraction between compounds.
What type of charge does each part of an atom have (positive, negative, no charge)
Protons:
Neutrons:
Electrons:
What is the BEST way to determine if a chemical change has occurred?
1. try and ignite the substance
2. examine the properties before and after the change
3. try and melt the substance
4. see if you can reverse the process
Answer:
2. examine the properties before and after the change
During an experiment, a student moves a cell from pure water to salted water. What will most likely happen to the cell?
Answer:
It will shrivel.
Explanation:
Because it is a hypertonic solution
Answer:
Explanation:
the solution will be hypertonic
the cell will shrink due to exosmosis and all water constituents of the cell will move out so cell will shrink
hope it helps
mark as brainlist please i need 1 more
What are good life notes about science
Answer:
science is pointless and you will never need it so just get thru the class and let it go.
Explanation:
have a good day in need to get rid of the adds so I'm answering as many questions ap
Can someone pls help, I’m sorry if it’s a lot
help please!!
*8th grade science
Five friends are eating ice cream. They wondered why their metal spoons were so cold. This is what they said:
Dane: I think the cold from the ice cream was transferred to the spoon.
Alex: I think a metal spoon is a good conductor of cold.
Mayra: I think heat from my hand moves through the spoon to the ice cream.
Elise: I think it is because there is more cold than heat.
Astrid: I think it is because things made of metal are cold.
Who do you think has the best idea? Explain your thinking using your knowledge of heat transfer as well as your
knowledge of insulators and conductors.
Answer:
alex
Explanation:
I dont know how to explain it but it is alex
I kinda need help with this
SKETCH OF J.JTHOMSON MODEL OF AN ATOM.
Answer:
Ball with thingies around it
is diamond an element, a compound, or a mixture?
Answer: A diamond is a heterogeneous mixture. But it could be considered a element because it is made out of carbon which is an element.
Explanation:
Which of the following is the primary medium for beach erosion?
ice
gravity
wind
water
Answer:
Water is the primary erosion
hope it helps :)
A 2.500g sample of compound containing only Carbon and Hydrogen is found containing 2.002g of Carbon. Determine the empirical formula of the compound.
The empirical formula : CH₃
Further explanationGiven
2.5 g sample
2.002 g Carbon
Required
The empirical formula
Solution
Mass of Hydrogen :
= 2.5 - 2.002
= 0.498
Mol ratio C : H :
C : 2.002/12 = 0.167
H : 0.498/1 = 0.498
Divide by 0.167 :
C : H = 1 : 3
The empirical formula of the given sample containing only Carbon and Hydrogen is CH₃.
What is empirical formula?Empirical formula of any compound tells about the relative proportion of the constituents of that compound.
Given mass of compound = 2.5 g
Given mass of carbon = 2.002G
Mass of hydrogen = 2.5 - 2.002 = 0.498
Molar ration will be find by dividing the given mass by molar mass as:
C:H
2.002/12 : 0.498/1
0.167 : 0.498
Now we divide the upper quantities with the least obtained value as:
C:H
0.167/0.167 : 0.498/0.167
1 : 3
Hence, the empirical formula is CH₃.
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In a chemical reaction, an atom of lithium (Li) loses an electron, and an atom of chlorine (Cl) gains an
electron. Which statement is true?
The lithium ion are the chlorine ion will be attracted to each other.
The lithium ion and the chlorine ion will repel each other.
These particles will have the same charge.
These ions will neither attract nor repel each other.
Answer:
a
Explanation:
Li will have + charge and Cl with - charge.. Positive and negative attract each other forming ionic bond
The correct option is (a) The lithium ion are the chlorine ion will be attracted to each other.
Lithium becomes a positive lithium cation after "losing" its valence electron. A negative chloride anion is created when chlorine "gains" that electron. Ionic bonds are created when opposing charges electrostatically attract one another.Another exception to the octet rule is lithium, an alkali metal with three electrons. Lithium typically gains two valence electrons and loses one electron to adopt the electron configuration of helium, the closest noble gas.Will lithium and chloride attract?Lithium chloride, also known as LiCl, is created when the lithium cation and chlorine anion, which have opposing charges, come into contact. When two elements with significantly different electronegativities (more than 2.1) connect with one another, ionic compounds typically result.
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What are the two toxic byproducts of incomplete combustion?
Select one:
a. oxygen, carbon monoxide
b. carbon, oxygen
c. water, carbon dioxide
d. carbon, carbon monoxide
a. How many grams of H2 gas are produced if 32
grams of CH4 gas are consumed?
Mass of H₂ produced = 12 g
Further explanationGiven
32 grams of CH₄
Required
mass of H₂
Solution
Reaction
CH₄ + H₂O (+ heat) → CO + 3H₂
mol CH₄(MW= 16 g/mol) :
= mass : MW
= 32 g : 16 g/mol
= 2
From the equation, mol ratio CH₄ : H₂ = 1 : 3, so mol H₂ :
= 3/1 x mol CH₄
= 3/1 x 2
= 6
Mass H₂(MW = 2 g/mol) :
= mol x MW
= 6 x 2
= 12 g
