Answer:
Mass of hydrogen needed = 10 g
29.22 gram of sodium are required
Explanation:
1 )Given data:
Mass of oxygen = 80.0 g
Mass of hydrogen needed = ?
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 80 g/ 32 g/mol
Number of moles = 2.5 mol
now we will compare the moles of oxygen and hydrogen.
O₂ : H₂
1 : 2
2.5 : 2× 2.5 = 5 mol
Mass of hydrogen:
Mass = number of moles × molar mass
Mass = 5 mol × 2 g/mol
Mass = 10 g
2 : Given data:
initial mass ration of chlorine and sodium react with each other = 1.54 g : 1.0 g
Mass of sodium required for 45 g of chlorine = ?
Solution:
Cl₂ : Na
1.54 : 1.0
45 : 1.0/1.54× 45 = 29.22 g
Thus, 29.22 gram of sodium are required.
A 62.9 g sample of ground water is found to have a lead concentration of 13.97 ppm. Calculate the mass of lead in the sample in milligrams.
Answer:
0.879 mg
Explanation:
To solve this problem we need to use the definition of ppm:
ppm = μg solute / g solutionWith the above information in mind we can calculate the micrograms of lead using the concentration (13.97 ppm) and mass of solution (62.9 g):
μg lead = 13.97 ppm * 62.9 gμg lead = 878.713 μgFinally we convert μg to mg:
878.713 μg * [tex]\frac{1mg}{1000ug}[/tex] = 0.879 mg of lead What volume (in liters) of a 1.772 M BaCl2 solution is needed to obtain 123 g of BaCl2?
Answer:
Volume required = 0.327 L
Explanation:
Given data:
Volume in L = ?
Molarity of solution = 1.772 M
Mass of BaCl₂ = 123 g
Solution:
First of all we will calculate the number of moles of BaCl₂,
Number of moles = mass/molar mass
Number of moles = 123 g/ 208.23 g/mol
Number of moles = 0.58 mol
Now, given problem will solve by using molarity formula.
Molarity = number of moles / volume in L
1.772 M = 0.58 mol / Volume in L
Volume in L = 0.58 mol / 1.772 M
Volume in L = 0.327 L
Which of these correctly describes the energy that makes the carousel turn
Answer:
F
Explanation:
A carousel can be made to rotate using different sources of energy. One may decide to use electric energy, manual effort, water energy or heat energy as in a candle carousel.
When the candle is lit, heat energy is supplied and warm air rises heating up the air near the carousel eventually causing it to start rotating.
Hence heat from the candle leads to a current of warm air that rises up, causing the carousel to start rotating.
For the chemical reaction:
ALOH3 (s)
= Al2O3 (s)
+ H20 (l)
Calculate the mass of water formed when 100 g of Al(OH)3 is heated. (AI = 27: 0 - 16; H = 1)
Answer:
35.1 g
Explanation:
Given data:
Mass of Al(OH)₃ = 100 g
Mass of water formed = ?
Solution:
Chemical equation:
2Al(OH)₃ → Al₂O₃ + 3H₂O
Number of moles of Al(OH)₃:
Number of moles = mass/molar mass
Number of moles = 100 g/ 78 g/mol
Number of moles = 1.3 mol
now we will compare the moles of Al(OH)₃ with water.
Al(OH)₃ : H₂O
2 : 3
1.3 : 3/2×1.3 = 1.95
Mass of water produced:
Mass = number of moles ×molar mass
Mass = 1.95 mol × 18 g/mol
Mass = 35.1 g
answer two quetions.......
Answer:5.=D
6.=B
Explanation:
What is the mass of 0.8 mole of water molecules.
Answer:14.4g
Explanation:
Suggest reasons for and against the inclusion of hydrogen in the main group of the periodic table
Answer:
See explanation
Explanation:
Hydrogen has only one valence electron. Sometimes, hydrogen is included as part of group 1 or 17 in the periodic table. Is this correct? Well, the answer to this question is not so straight forward!
Let us remember that hydrogen forms a univalent positive ion H^+ just like the group 1 elements, but it also forms a univalent negative ion H^- just like group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements. This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
However, it is convenient to include hydrogen in the main groups 1 or 17 when discussing its chemical properties in order to make it easier to assimilate. If we place hydrogen in group 1, we can understand that it forms univalent positive ions. Similarly, if we place it in group 17, we understand that it forms univalent negative ions.
Most times hydrogen is just written separately at the top right corner of the periodic table and not as a member of any group because of the issues outlined above.
Hydrogen is placed in the main group of the periodic table since it has only one electron in it and it also behaves like alkali metal properties.
Hydrogen atom:Hydrogen forms a univalent positive ion [tex]H^+[/tex]group 1 elements, but it also forms a univalent negative ion [tex]H^-[/tex]group 17 elements. Also, hydrogen is a gas and forms a molecular diatomic compound just like group 17 elements.
This is not the case with other group 1 elements. We can see that hydrogen is chemically and physically dissimilar to other group 1 elements hence one can logically argue against its inclusion in group 1. Also, it is not a halogen, so we can also argue against its inclusion in group 17.
If we place hydrogen in group 1, we can understand that it forms univalent positive ions and if it is placed in halogen group it will form univalent negative ion.
Find more information about Hydrogen here:
brainly.com/question/25597694
write down any four uses of solution
.I will mark him\her as brilliant
Answer:
because it will help u
because it will make u to understand the question very well
The temperature of a plastic cup is 70 °F. It is filled with water that is
40 °F. Which of the following describes how thermal energy is
transferred?
Answer:
From the plastic cup to the water
Explanation:
The thermal energy is transferred from the plastic cup to the water inside the cup.
This is because thermal energy moves from a body at high temperature to one at lower temperature.
Thermal energy is the energy due to the motion of the particles of a medium. An increase in thermal energy leads to a rise in the average kinetic energy of the system. It moves over a gradient usually from a body with a high temperature to one at a lower temperature.As the temperature of a gas increases with the volume remaining constant, the pressure of the gas A) decreases B) increases C ) remains the same
Answer:
B) increases
higher temperature = higher pressure
There is about 30 g of Californium-252 left, how much time has elapsed?
You haven't provided two critical pieces of info needed to answer this question. First, what's the half-life of Californium-252, and second, what's the initial amount of Californium-252. Given these two values, you can then set up an exponential equation to find the time elapsed.
Rank the following in terms of increasing boiling point:_______. CH3CH2OCH2CH3 CH3CH2OCH3 CH3CH2CH2CH3 CH3CH2CH2CH2NH2 a. CH3CH2CH2CH2NH2 < CH3CH2CH2CH3 < CH3CH2OCH3 < CH3CH2OCH2CH3 b. CH3CH2CH2CH3 < CH3CH2OCH2CH3 < CH3CH2OCH3 < CH3CH2CH2CH2NH2 c. CH3CH2OCH3 < CH3CH2CH2CH3 < CH3CH2OCH2CH3 < CH3CH2CH2CH2NH2 d. CH3CH2CH2CH2NH2 < CH3CH2OCH2CH3 < CH3CH2OCH3 < CH3CH2CH2CH3 e. CH3CH2CH2CH3< CH3CH2OCH3< CH3CH2OCH2CH3< CH3CH2CH2CH2NH2
Answer:
CH3CH2CH2CH3 <CH3CH2OCH3<CH3CH2OCH2CH3< CH3CH2CH2CH2NH2
Explanation:
Some important factors affect the boiling point of aliphatic compounds. Prominent among them are;
1) relative molecular mass
2) nature of intermolecular
3) surface area of compound.
In this case, the nature of intermolecular forces and the molecular mass of the compounds are worthy of mention.
The degree of dipole interaction in CH3CH2CH2CH2NH2 is far greater than that in the ethers hence the amine has the highest boiling point followed by the ether of higher molecular mass then the ether of lower molecular mass and finally the alkane has the lowest boiling point because only dispersion forces are involved.
The correct ranking of the given organic compounds from highest to lowest boiling points is given by;
Option D; CH3CH2CH2CH2NH2 < CH3CH2OCH2CH3 < CH3CH2OCH3 < CH3CH2CH2CH3
We are given the organic compounds;
CH3CH2OCH2CH3
CH3CH2OCH3
CH3CH2CH2CH3
CH3CH2CH2CH2NH2
The family names of the given organic compounds are;
CH3CH2OCH2CH3 is an ether
CH3CH2OCH3 is an ether
CH3CH2CH2CH3 is an alkane
CH3CH2CH2CH2NH2 is an amine
The boiling points are given in the order from highest to lowest as;
Alkanes < Ethers < Amines
This is because Amines have higher possibility of hydrogen bonding than the others.
Lastly, a longer chain ether will have a higher boiling point than the shorter chain one because it can have more Vander walls force interactions.
Thus, the correct order of arrangement of the given organic compounds from highest to lowest boiling point is;
CH3CH2CH2CH2NH2 > CH3CH2OCH2CH3 > CH3CH2OCH3 > CH3CH2CH2CH3
Read more about ranking of organic compounds according to boiling points at; https://brainly.com/question/13708633
what is the empirical formula of a compound that is found to consist of 56% chorine and no other element except iron
Answer:
FeCl₂
Explanation:
Empirical formula is the simplest formula of a compound.
Mass percentage of Chlorine = 56%
Mass percentage Iron = 100 - 56 = 44%
Elements
Fe Cl
Percentage mass 44 56
moles 44/55.85 56/35.5
0.79 1.56
Divide by the smallest
number 0.79/0.79 1.56/0.79
1 2
The empirical formula of the compound is FeCl₂
In Space, an astronaut releases a wrench from his hand. The wrench has a mass of 4 grams and is traveling with a velocity of -15m/s. The Astronaut’s mass is 70kg. What is his Velocity?
Answer:
860 cm/s
Explanation:
Let P = momentum of wrench-man system before throwing the wrench and P' = momentum of wrench-man system before throwing the wrench.
From the law of conservation of momentum,
P = P'
P = 0 (since both Astronaut and wrench were initially stationary) and P' = m₁v₁ + m₂v₂ where m₁ = mass of wrench = 4g = 0.004 kg v₁ = velocity of wrench after releasing the wrench = -15 m/s m₂ = mass of Astronaut = 70 kg and v₂ = velocity of Astronaut after releasing the wrench.
So, P = P'
0 = m₁v₁ + m₂v₂
-m₁v₁ = m₂v₂
dividing both sides by m₂, we have
v₂ = -m₁v₁/m₂
substituting in the values of the variables, we have
v₂ = -0.004 kg × (-15 m/s)/70 kg
= 0.06 kgm/s ÷ 70 kg
= 8.6 × 10⁻⁴ m/s
= 860 × 10⁻² m/s
= 860 cm/s
Octet Rule states that atoms of main-group elements tend to combine in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas. Depending on this fact answer the following question :
1)What is an incomplete octet?
2)What is an odd-electron molecule?
3)Why are there extra electrons in the expanded octet?
Answer:
1. an incomplete octet is an valence shell that is not fully stable since it doesn't have 8 electrons
2.an odd electron molecule is a molecule that has an odd number of electrons but is still stable
3. there are extra electrons in an expanded octet because the molecules' central atoms make extra bonds that don't comply with the octet rule.
Explanation:
teeth to Bachile can be see more than once
Come as the chemical mantragen has the valence electrons each hydrogen has one walence electron, and chionner
Campie eles are for this went compound
.
NH H-
CI
ou
which action would not help a person stay safe during a tornado Giving brainliest
Answer:
B.... i think so, not sure lol
Answer:
B. Driving to get supplies
Explanation:
Don't drive in the middle of a tornado EHLBFDHS
please help me i will give brain list
a)CH3-CH2-CH2-CH=CH2
b)CH3-CH2-CH2-CH2-CH2-CH2-CH3
c)CH≡C-CH2-CH2-CH2-CH3
d)CH3-CH2-CH2-CH2-CH2-CH2-CH=CH2
e)CH3-CH2-CH2-CH2-CH2-CH2-CH2-CH2-CH3
give me brain list
Daniella found an iron metal cube. The volume of the cube is 20 cm3 as shown below.
non
20.0 cm
If the density of iron is 7.9 g/cm3, what is the mass in grams of this iron cube?
A) 0.395 g
B) 2.53 g
C) 27.99
D) 158 g
Answer:b) 2.53
Explanation:
I want a Huge conversation about planets (kid friendly)
Answer:
Plants are made of gas and mass
Answer:
hello again :-)))))))
What is the molarity of 2.0 moles of glucose
in 4.0 L of glucose solution?
Answer:
0.5 M
General Formulas and Concepts:
Chemistry - Aqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define
2.0 mol glucose
4.0 L glucose solution
Step 2: Find Molarity
Substitute: M = 2.0 mol / 4.0 LDivide: M = 1/2Evaluate: M = 0.5Write a chemical equation showing how each behaves as an acid when dissoblbed in water.
a. H2s
b. NH4
Answer:
a. H₂S(aq) + H₂O(l) ⇄ HS⁻(aq) + H₃O⁺(aq)
b. NH₄⁺(aq) + H₂O(l) ⇄ NH₃(aq) + H₃O⁺(aq)
Explanation:
According to Bronsted-Lowry acid-base theory,
An acid is a substance that donates a H⁺.A base is a substance that accepts a H⁺.a. When dissolved in water, H₂S behaves as an acid according to the following equation.
H₂S(aq) + H₂O(l) ⇄ HS⁻(aq) + H₃O⁺(aq)
b. When dissolved in water, NH₄⁺ behaves as an acid according to the following equation.
NH₄⁺(aq) + H₂O(l) ⇄ NH₃(aq) + H₃O⁺(aq)
Describe the motion of particles in a liquid as it freezes.
Answer:
The particles in a liquid as it freezes slow down.
Explanation:
This is because heat is energy and when there is less heat, there is less energy causing the particles to slow down.
1. A dry food product is contained in a 1 cm x 4 cm x 3 cm box using a polymer film to protect the oxygen sensitivity of the product. The concentration gradient across the film is defined by the oxygen concentration in air (0.01164 kg/m3) and 0.244 kg/m3 within the package. The oxygen diffusivity for the polymer film is 3 x 10-16 m2/s. Estimate a- the allowable flux of oxygen into the package (in kg O2/s), and b- the film thickness needed, to ensure a product shelf life of 10 months. The shelf life of the product is established as the time when oxidation reactions within the product have used 0.5 mol of oxygen.
Answer:
total is 20.8
Explanation:
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balance by oxidation number method<br />KMnO4 + Na2O₂ + H2 so4 ko2so4 +<br />Mosou4 + Na2so<br />4 + O2 + H₂O
Answer:
8H2SO4 + 2KMnO4 + 5Na2O2 => 8H2O + 2MnSO4 + 5Na2SO4 + 5O2 + K2SO4
have:
Explanation:
Identify the element in group 15, period 3 by drawing a Lewis Dot Structure
Answer:
Phosphorus
Explanation:
Lewis Dot Structure is a structural representation of a molecule that shows valence electrons of a molecule.
The element in group 15, period 3 is Phosphorus (P). Phosphorus has an atomic number 15 and valence electrons are 5. So, the lewis structure will show 5 dots around P atom.
Giving Brainliest if u help me with this
Answer:
A
Explanation:
Answer:
B. The western coast of the united states
Explanation:
I'm not sure if its correct but its pretty simple to understand, if you look at the arrows red represents heat, and blue represents cold, the red arrows (warm climate) is at the left more towards the U.S, therefore looking at the guide of North West South and East, it is at the western coast of the u.s
Hope this help! <3
Perform the following
mathematical operation, and
report the answer to the correct
number of significant figures.
1.987/3.46 = [?]
Answer:
.574
Explanation:
smallest number of digits in the expression was 3, so the final answer should have 3 sig figs
Which answer best describes the meaning of submerged?
The hurricane produced so much rain and flooding that cars were submerged.
drowned
damp
wet
underwater
Answer:
Drowned
Explanation:
We can use drown here, that sounds appropriate.
? C+? O2 +? CO2,
what is the maximum amount of CO2 which
could be formed from 13.19 g of C and 15.92 g
of O2?
Answer in units of g.
Look at the mole ratio in the balanced equation
2CO + O2 ==> 2CO2
3.44 mol O2 x 2 mol CO/mol O2 = 6.88 moles CO
