Answer:
Question Answer
The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 10.52 years? 2
12.5% of a radioactive sample are left. How many half-lives have passed? 3
After 3 half-lives, how much of a 400 gram sample of radioactive uranium remains? 50g
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
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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(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
Would a negative charge plus a positive charge be a proton and electron and why?
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.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
IF CONSTRUCTIVE INTERFERENCE PRODUCES A WAVE WITH
GREATER AMPLITUDE, THIS MEANS THE WAVE IS BIGGER OR
SMALLER?
Answer:
This means that the wave is bigger because amplitude is the hight of the crest of the wave!
Explanation:
SO IT MEANS THE WAVE IS BIGGER AND TALLER :D
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’m very confused...
Answer:
D. in Carbon dioxide released by factory's in to the atmosphere
Explanation:
hope this helps.
Answer:
I think in B drinking water supplies
or D.
Explanation:
it had to be D instead
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! :)
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.
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.
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:
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.
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.
9. Frontal Lobe is responsible for? M
(5 Points)
artistic expression
sensory information
visual information
O coordination and motor movement
Answer:
Artistic expression
Explanation:
Think of it as the control panel of our personality and our ability to communicate
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.
What property of matter does not change even though the appearance may change?
Answer:
The law of the conservation of mass states that matter is neither created nor destroyed, only converted to other forms. Therefore, the mass never changes, even if its appearance does.
Explanation:
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
How do you find the significant figure of 505kg-450.25kg
Answer:
4 significant figures
Explanation:
505 has 3 significant figures
450.25 has 5 significant figures
First do simple subtraction
505 - 450.25 =54.75
And then evaluate any number that has significance or is important if the decimal were to be moved.
4 significant figures
55. Which is a characteristic of all ions? (1 point)
They are made of one type of atom.
They have one overall charge.
They are made of two or more types of atoms.
They have two or more overall charges.
Answer:
I do believe it's they have one overall charge. Not sure though.
Explanation:
Electromagnetic waves have different ______ and ______ but the same _______.
Answer:
electromagnetic waves have different wavelengths and frequencies but the same velocity
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
I NEED HELP IM ON TIMER
A base is added to water. What happens when the position of equilibrium lies to the left?
The base is completely dissociating into products.
The base is partially dissociating into products.
The base is not dissociating into any ions.
The base is present in very small amounts.
Answer:
Option 2 or B
Explanation:
The base is partially dissociating into products.
HAVE A GREAT DAT STAY SAFE!
The correct answer is: The base is not dissociating into any ions.
When the position of equilibrium lies to the left, it means that the equilibrium favors the formation of the reactants rather than the products. In the context of a base being added to water, it implies that the base does not dissociate significantly into ions or dissociates only to a small extent.
When a base is added to water, it can undergo a process called ionization or dissociation, where it breaks apart into ions. In the case of a strong base, such as sodium hydroxide (NaOH), it completely dissociates into its constituent ions (Na+ and OH-) in water. This means that all the base molecules break apart, and a high concentration of ions is present in the solution.
However, if the base is weak or the equilibrium lies to the left, the base molecules do not dissociate significantly into ions. This can be due to factors such as the nature of the base or the conditions of the reaction. In such cases, only a small fraction of the base molecules dissociate into ions, and the concentration of ions in the solution is relatively low.
Therefore, when the position of equilibrium lies to the left, it indicates that the base is not dissociating into any ions or is dissociating only to a small extent. The base remains mostly in its molecular form and is present in the solution in relatively small amounts.
Learn more about equilibrium from the link given below.
https://brainly.com/question/30694482
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Which number is the subscript in the following formula?
2Li3N4-
- 2
- 3
- 4
Answer:
4
Explanation
It states there is two before the Li, and I ruled out three because four is the only number that goes after the particles that stands alone, the three means that there are three particles of N4
Brainless if correct
Answer:
D
Explanation:
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
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.
What is the density of nitrogen gas if 0.186 g occupies a volume of 110 mL?
Answer:
[tex]d=1.69\times 10^{-3}\ g/mL[/tex]
Explanation:
Given that,
Mass, m = 0.186 g
Volume occupies, V = 110 mL
We need to find the density of Nitrogen gas. The mass per unit volume is called density of an object. It is given by the formula as follows :
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{0.186\ g}{110\ mL}\\\\=1.69\times 10^{-3}\ g/mL[/tex]
So, the required density is [tex]1.69\times 10^{-3}\ g/mL[/tex].
