Answer:
2.8 x 10²³ molecules H₂O
1.4 x 10²³ molecules O₂
Explanation:
First, you will need the balanced chemical equation for the formation of water:
2H₂ + O₂ -> 2H₂O
This will help in determining the mole ratios between water and oxygen, which we will need later.
Let's first calculate the number of H₂O (water) molecules. This will require stoichiometry. We are also given the mass, so we must convert mass into moles, then moles into molecules. mass -> moles -> molecules
8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (6.02 x 10²³ molecules H₂O/1 mol H₂O) = 2.8404 x 10²³ molecules H₂O
Rounded to 2 significant digits: 2.8 x 10²³ molecules H₂O
Now, to find the molecules of water, we can begin with the same stoichiometric equation, but before we convert to molecules, we will have to convert moles of water to moles of oxygen. This is where we will use the mole ratio of water to oxygen we got from the balanced chemical equation earlier. 2H₂O:1O₂
8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (1 mol O₂/2 mol H₂O) x (6.02 x 10²³ molecules O₂/1 mol O₂) = 1.4202 x 10²³ molecules O₂
Rounded to 2 significant digits: 1.4 x 10²³ molecules O₂
A small molecule with an overall charge is called a(n)
Answer:
Monotomic atom
Explanation:
Which star reaches a greater apparent brightness?
Answer:
he distance to a star can be found by comparing its luminosity to its apparent brightness.
Explanation: A star that is far away will be very dim compared to its luminosity. So it proves that the ratio of its luminosity to apparent brightness will be greater than for a nearby star.
(PLZ HELP) Would increasing the number of batteries in a circuit that is connected to a small electric motor affect the speed of the motor, if all other variables are kept constant?
Answer:Yes
Explanation the motor would run faster because the increased electrical force increases the magnetic force in the motor
A sodium metal has electron configuration 2,8,1 , what is the electron configuration of sodium ion?
Answer:
Na⁺ = 1s² 2s² 2p⁶ 3s⁰
Explanation:
Sodium is alkali metal.
It is present in group 1.
Its atomic number is 11.
Its atomic mass is 23 amu.
Its electronic configuration is,
Na₁₁ = 1s² 2s² 2p⁶ 3s¹
Thus electrons in 3 energy levels are 2, 8, 1.
Sodium have one valance electron. The one valance electron of sodium is easily lost by sodium atom and get stable electronic configuration and form cation.
Na → Na⁺ + 1e⁻
Electronic configuration of sodium ion:
Na⁺ = 1s² 2s² 2p⁶ 3s⁰
Thus electrons in 3 energy levels are 2, 8.
What is the equation to determine the MA of a wedge?
MA= length - width
MA= Length+ width
MA= Length * width
MA= Length/ wisth
Answer:
length/width
Explanation:
Answer:
Length/Width
Explanation:
I did the module 10 exam so I know it is length/width
What conclusions can be drawn regarding the molecule C6H12O6?
1. The molecule is inorganic; it is a salt.
2. The molecule is organic; it is a salt.
3. The molecule is inorganic; it is a carbohydrate.
4. The molecule is organic; it is a carbohydrate.
Which answer best describes the relationship between sodium and aluminum?
1. Sodium and aluminum have similar chemical properties because they are in the same group.
2. Sodium and aluminum have similar chemical properties because they are in the same period.
3. Sodium and aluminum have the same number of electron shells because they are in the same group.
4. Sodium and aluminum have the same number of electron shells because they are in the same period.
Water in a beaker measures 250 milliliters. A rock is completely submerged in the water. The water level now reads 375 milliliters. What is the volume of the rock in cubic centimeters? Explain your answer.PLEASE HELP ASAP
Answer:
Volume of the rock = 125 cubic centimetres
Explanation:
Given:
Water in beaker = 250 millilitres
Water in beaker after rock = 375 millilitres
Find:
Volume of the rock
Computation:
Volume of the rock = Water in beaker after rock - Water in beaker
Volume of the rock = 375 - 250
Volume of the rock = 125 millilitres
1 millilitres = 1 cubic centimetres
So,
Volume of the rock = 125 cubic centimetres
Answer:
The answer is 125 cubic meters
Explanation:
Because you subtract 375-250 and get 125
Answer=125
Which layer of the soil profile would be affected the most by weathering and erosion?
A 1
B 2
C 3
D4
Please help
Answer:
A1
Explanation:
In the following reaction, if you wanted to produce more chlorine gas (Cl2), what should you do? (2 points)
4HCl + O2 ⇄ 2H2O + Cl2
a
Add more H2O
b
Remove HCl
c
Remove O2
d
Add more HCl
Answer:
d. Add more HCl
Explanation:
To produce more Cl₂ gas, it is best to add more HCl to the reaction. In this way more products will be formed.
According to the Le Chatelier's principle "if the conditions of equilibrium is changed, the system will adjust itself in order to annul the effect of the change".
We more HCl is added, to the reactant side, to annul this equilibrium disturbing substance, the system is shifted to the right hand side. In this way more product is formed.The study of chemicals and bonds is called chemistry.
The correct answer is D.
According to the Charlier principle, the reaction will shift to the formation of the product when the amount of reactant is more.
According to the question, we have to produce more Cl in the given reaction.
[tex]4HCL+ O_2---> 2H_2O + CL_2[/tex].
To increase the amount of chlorine in the equation, we have to increase the HCl in the equation because the Chlorine gas is evolved from the HCl.
Hence, the correct answer is D.
For more information, refer to the link:-
https://brainly.com/question/25305623
HELP PLEASE lol, I just need a couple answers but I can't find this one anywhere, pic of question down below. :)
Answer:
It's b
Explanation:
please help, 15 points
1rst is D, second is A
Explanation:
You are given the reaction Cu + HNO3 → Cu(NO3)2 + NO + H2O. Half-reactions: First: 3 upper C u right arrow 3 upper C u superscript 2 plus, plus 6 e superscript minus. Second: 2 upper N superscript 5 plus, plus 6 e superscript minus right arrow 2 upper N superscript 2 plus. Complete the final balanced equation based on the half-reactions. Cu + HNO3 Right arrow. Cu(NO3)2 + NO + H2O
Answer:
Explanation:
You are given the reaction Cu + HNO3 → Cu(NO3)2 + NO + H2O.
Half-reactions:
First: 3 upper C u right arrow 3 upper C u superscript 2 plus, plus 6 e superscript minus. Second: 2 upper N superscript 5 plus, plus 6 e superscript minus right arrow 2 upper N superscript 2 plus.
Complete the final balanced equation based on the half-reactions.
⇒ 3Cu +
⇒ 8HNO3
⇒ 3Cu(NO3)2 +
⇒ 2NO +
⇒ 4H2O
The final balanced equation based on the half-reactions is 3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O
What is Redox Reaction ?Redox is a type of chemical reaction in which the oxidation states of substrate change.
Oxidation is the loss of electrons or an increase in the oxidation state of a chemical or atoms within it.
Reduction is the gain of electrons or a decrease in the oxidation state of a chemical or atoms within it
Given Equation ;
Cu + HNO₃ → Cu(NO₃)₂ + NO + H₂O
The first step is to write the oxidation numbers for each atoms in the given equation
Cu0 + H⁺¹N⁺⁵O⁻²₃ → Cu⁺²(N⁺⁵O⁻²₃)₂ + N⁺²O⁻² + H⁺¹₂O
Identify the oxidizing and reducing agent
OXIDATION ---Cu0 → Cu⁺²(N⁺⁵O⁻²₃)₂ + 2e- REDUCTION---H⁺¹N⁺⁵O⁻²₃ + 3e- → N⁺²O⁻²Balance equation in half reaction
Cu0 + 2 HNO₃ → Cu⁺²(N⁺⁵O⁻²₃)₂ + 2e-
H⁺¹N⁺⁵O⁻²₃ + 3e- → N⁺²O⁻²
Now balance the charge
Cu0 + 2HNO₃ → Cu⁺²(N⁺⁵O⁻²₃)₂ + 2e- + 2H+
H⁺¹N⁺⁵O⁻²₃ + 3e- + 3H+ → N⁺²O⁻²
Balance the oxygen atom
Cu0 + 2HNO3 → Cu+2(N+5O-23)2 + 2e- + 2H+
H+1N+5O-23 + 3e- + 3H+ → N+2O-2 + 2H2O
Make electron gain equivalent to electron lost.
3Cu0 + 6HNO3 → 3Cu+2(N+5O-23)2 + 6e- + 6H+
2H+1N+5O-23 + 6e- + 6H+ → 2N+2O-2 + 4H2O
Complete reaction
3Cu0 + 8H+1N+5O-23 + 6e- + 6H+ → 3Cu+2(N+5O-23)2 + 2N+2O-2 + 6e- + 4H2O + 6H+
Simplify the equation
3Cu0 + 8H+1N+5O-23 → 3Cu+2(N+5O-23)2 + 2N+2O-2 + 4H2O
Final equation
3Cu + 8HNO₃ → 3Cu(NO₃)₂ + 2NO + 4H₂O
Learn more about Redox Reaction here ;
https://brainly.com/question/13293425
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How many moles of gases are in a can with a volume of 555 mL and a pressure of 600.0 kPa at
20.0°C? Volume needs to be converted to Liters because R is in liters, not mL
Answer:
Explanation:
The most common example is the molar volume of a gas at STP (Standard Temperature and Pressure), which is equal to 22.4 L for 1 mole of any ideal gas at a temperature equal to 273.15 K and a pressure equal to 1.00 atm.
Would a negative charge plus a positive charge be a proton and electron and why?
Which example is a body fossil?
shrimp burrow
dinosaur bone
dinosaur footprint
an ornithopod track
Answer: B. dinosaur bone
Explanation: Took the test hope this helps! :)
Brainless if correct
Answer:
D
Explanation:
What is the density of an object with a mass of 130 g and a volume of 5 cm^3? please explain or im gonna fail 7th grade science
Answer:
26 g/cm³
Explanation:
Given data:
Mass of object = 130 g
Volume of object = 5 cm³
Density of object = ?
Solution:
Formula:
d = m/v
d = density
m = mass
v = volume
d = 130 g/ 5cm³
d = 26 g/cm³
Which of the following best describes an atom?
Well there are no choices provided.
But an atom just consists of a central nucleus which has to be surrounded by 1+ electrons. The nucleus is positively charged (this contains a positively charged proton and a neutrally charged neutron).
Atoms are the building blocks of life.
An unknown occupies a volume of 5 ml and Has a mass of 40 grams what is its density
Answer:
8 g mL
Explanation:
TRUST ME
PLEASEE HELP MEE!!! ITS DUEE SOOON!!!
Scientists study Earth's interior using
Question 7 options:
Observation of the interior
Mining equipment
Seismic waves
Tectonic plates
Answer:
Seismic waves
Explanation:
Scientists study earth's interior using seismic waves. These waves are produced during an earthquake.
The waves have very unique properties that makes them useful for studying the subsurface. Two types of seismic waves are predominantly used. P -waves are the primary waves that passes through any mediumS -waves are the secondary waves that passes only through solids Using these properties, scientists can study the earth's interior.Which atom loses 2 electrons while forming an ion?
Answer:
it would be a cation ... i believe
Explanation:
To become a cation, a positively charged ion, an atom would have to lose at least two electrons
Electromagnetic waves have different ______ and ______ but the same _______.
Answer:
electromagnetic waves have different wavelengths and frequencies but the same velocity
Which of the following states of matter has a definite volume
Answer:
Solid and Liquids
Explanation:
Solid has both definite shape and volume
It's stays on what is there natural appearance.. while
Liquid has definite volume but has indefinite shape
Answer:
[tex]\boxed {\boxed {\sf Solids \ and \ liquids}}[/tex]
Explanation:
Let's review the 3 main states of matter:
Solid:
Particles vibrate, but are stationary. The solid doesn't change under normal conditions. Definite shape and volumeLiquid:
Particles flow and glide. The liquid fills the container. Indefinite shape, definite volumeGas:
Particles fly around rapidly. The gas fills it's container and is very compressible. Indefinite shape and volumeSo, we see that the 2 states of matter with definite volume are solids and liquids.
Need help ASAP... The diagram shows a box in the periodic table.. what is the atomic number of the element??
The average atomic mass of potassium is 39.098 amu. This element has 3 naturally occurring isotopes K-39, K-40, and K-41. Which is likely to be most abundant?
Answer:
k-39
Explanation:
also pls mark brainliest <3 :)))
Answer- k-39
Explanation:
it is the closest to the actual amu
8. Were there any problems with the experiment or the methods? Did you have any surprising results
The pressure in a cylinder of nitrogen continuously decreases as a gas is released from it. On the other hand, a cylinder of propane maintain the constant pressure as propane is released. Explain this difference in behavior
Answer:
Explanation:
Nitrogen gas in nitrogen cylinder is in gaseous form only . So when gas is released , pressure decreases because moles of gas in the cylinder decreases .
Propane gas in cylinder is in liquified form . The gas is partially in gaseous and liquid form . So when gas is released outside , pressure decreases inside but due to low pressure , some liquid form is converted into gaseous form which restores the pressure of gas inside cylinder . Hence , the pressure of gas remains unchanged inside cylinder.
I need help with this!
Answer:
wavelength decreases, the frequency increases
Explanation:
In the electromagnetic spectrum, as the wavelength decreases, the frequency increases.
The wavelength of the wave is the distance between successive troughs and crests along the wave train.
Frequency of the wave of the number of waves that passes through a point per unit of time.
On an electromagnetic wave, as the wavelength decreases the frequency increases. Also, as the wavelength increases the frequency decreases.amino acid is to protien as?
1) fat is to lipid
2) dna is to rna
3)sugar is to fat
4) simple sugar is to starch
A candle weighs 25 grams before burning. After burning for 10 minutes, the candle now weighs 17 grams. Using the Law of Conservation, explain how this is possible.
Explanation:
These are some unaccounted mass that was involved.
According to the law of conservation "matter is neither created nor destroyed but can be combined with one another".
The rule applies to all substances with no exception When burning a candle, a phase change process is going on. Some candle part of the candle occur in molten form whereas the other part is a solid. In this experiment, the molten wax was not taken into consideration. This accounted for the mass deficit.