Answer:
90 minutes
Explanation:
The half life of a first order reaction is;
t1/2 = ln(2) / k
To solve for t;
The integral rate expression for a first order reaction is;
ln[A] = ln[Ao] - kt
t = 60 minutes
Final Concentration = [A] = 100 - 37 = 63
Initial Concentration = [Ao] = 100
ln(63) = ln(100) - k (60)
k (60) = ln (100) - ln(63)
k = 0.4620 / 60 = 0.0077
Inserting the value of k in the half life equatin;
t1/2 = ln(2) / 0.0077 = 90 minutes
How does thermal energy affect chemical changes
Answer:
It makes chemicals hot or cold which makes chemicals react differently
Explanation:
mark me brainliest
Question 1
Which words in the passage help the reader understand the meaning of the word avid in the first paragraph?
A. What he found out
B. Many hours gardening
C.the curious and observant
D.he noticed
How does science affect our lives on the example of the pandemic?
Science affected our lives at the beginning of this pandemic.
Explanation:
Although scientists did study the virus to see how deadly it is the pandemic kept spreading. The spreading of the virus was not the scientist's fault it was the citizens' fault. They now found a vaccine that took hard work and a short amount of time.
PLEASEEEE HELPPP ME WITH THISS
A person riding in the passenger seat of a car is "pushed" into the car door as the car makes a sharp left turn.
Newton's 2nd Law
Newton's 1st Law
Newtons 3rd Law
Answer:
second law
Explanation:
Spring ends on what day?
summer solstice
winter solstice
vernal equinox
autumnal equinox
Answer:
June 20
Explanation:
Which of the following is an example of potential energy?*
A firework exploding.
O A race car gaining speed towards the finish line.
O A phone sitting on the desk.
O Boiling water.
boiling waterAnswer:
Explanation:
its called thermal energy
the mass of the sun
what is the mass of the sun
Answer:
1.989 × 10^30 kg
Explanation:
Hope this helps! :3
☁️ Answer ☁️
A solar mass is the mass of the sun. Or, more precisely, it's 1.989 x 10^30 kilograms — about 333,000 Earths. Astronomers use a solar mass as a basic unit of mass.
Dear fool, you will always be a fool.
Happy April Fools Day.
Hope it helps.
Have a nice day noona/hyung
Please help me answer this question but in your own words!!!!
Answer:
when sodium reacts with chlorine atoms, sodium will give an electron which is negative charged to chlorine.it makes sodium(+) and chlorine (-)..then sodium will attract chlorine to form sodium chloride(NaCl)
Help me asap pls man
Answer:
C
Explanation:
A p orbital has the approximate shape of a pair of lobes on opposite sides of the nucleus.
Explanation:
A p orbital would have a du-bbell shape.
Options A and B show a spherical shape, which are for s orbitals.
Option D shows a double du-bbell / clover leaf shape, which is for d orbitals.
The answer is Option C.
P.S. The word is censored apparently, so be forgiving! Thanks~
Calculate the concentration of 10g of magnesium chloride in 1dm3 of solution.
Answer:
0.105 mol/dm³
Explanation:
From the question given above, the following data were obtained:
Mass of MgCl₂ = 10 g
Volume of solution = 1 dm³
Concentration of MgCl₂ =?
Next, we shall determine the number of mole present in 10 g of MgCl₂. This can be obtained as follow:
Mass of MgCl₂ = 10 g
Molar mass of MgCl₂ = 24 + (2 ×35.5)
= 24 + 71
= 95 g/mol
Mole of MgCl₂ =?
Mole = mass /Molar mass
Mole of MgCl₂ = 10 / 95
Mole of MgCl₂ = 0.105 mole
Finally, we shall determine the concentration of MgCl₂. This can be obtained as follow:
Mole of MgCl₂ = 0.105 mole
Volume of solution = 1 dm³
Concentration of MgCl₂ =?
Concentration = mole / Volume
Concentration of MgCl₂ = 0.105 / 1
Concentration of MgCl₂ = 0.105 mol/dm³
Concentration is [tex]0.105\ mol/dm^{3}[/tex]
Given:-
Mass of MgCl₂ = 10 g
Volume of solution = [tex]1\ dm^{3}[/tex]
Concentration of MgCl₂ =?
[tex]Molar mass of MgCl_2 = 24 + (2\times35.5)\\= 24 + 71\\= 95 g/mol[/tex]
Mole of MgCl₂ =?
The number of moles is calculated by the equation as follows:-
[tex]Mole = mass /Molar massMole of MgCl_2= 10 / 95Mole of MgCl_2 = 0.105 mole[/tex]
Determine the concentration of [tex]MgCl_2[/tex] as follows:-
Mole of MgCl₂ = 0.105 mole
Volume of solution = 1 dm³
Concentration of MgCl₂ =?
[tex]Concentration = mole / Volume\\Concentration\ of\ MgCl_2 = 0.105 / 1\\Concentration \ of\ MgCl_2= 0.105 mol/dm^{3}[/tex]
Hence the concentration of 10g of magnesium chloride is [tex]0.105 mol/dm^{3}[/tex].
To know more about:-
brainly.com/question/16380318
Define energy and power then describe the relationship that exists between them.
Try for at least 3 complete sentences
Sentence starters:
Energy is.... Power is.... They are related because.....
Answer: With power and energy, power is units of energy divided by time. The same difference as distance and velocity. The units of power are watts, the units of energy are joules.
Explanation:
abcdefghijklmnopqrstuvwxyzExplanation:abcdefghijklmnopqrstuvwxyz
4) What is one advantage of using non-renewable resources?
Answer:
The main advantages of non-renewable energies is that they are abundant and affordable. For example, oil and diesel are still good choices for powering vehicles. Non-renewable energy is cost effective and easier to product and use.
Explanation:
there yah go
The total pressure in a flask containing only hydrogen and helium is 580 mmHg. If hydrogen accounts for 70% of the pressure and helium contributes 30% of the pressure, what is the partial pressure of the hydrogen gas?
A) 406 mmHg
B) 510 mmHg
C) 174 mmHg
D) 83 mmHg
Answer:
Answer choice c = 174
Explanation:
If you divide 30% into 580 you get 174. You can also check your work by doing 580 divided by 70%
30% divided by 580 = 174
How many elements and how many atoms are in MgCI2
Answer: two elements and three atoms
Explanation:
An element is the simplest substance and hence cannot be broken down using chemical reactions.
Magnesium chloride [tex](MgCl_2)[/tex] is an ionic compound formed by the transfer of electrons from element magnesium (Mg) to element chlorine (Cl) where Magmesium forms a cation [tex]Mg^{2+}[/tex] by losing two electrons and chlorine forms an anion [tex]Cl^{-}[/tex] by gaining electron.
There are 3 atoms in Magnesium chloride [tex](MgCl_2)[/tex] which include one atom of magnesium (Mg) and two atoms of chlorine (Cl).
What is the name of the family highlighted of
the periodic table above? How many valence
electrons does it have?
5.Calculate the number of moles of 18.0 dm3 of carbon monoxide (CO) at rtp.
Answer:
0.81mole
Explanation:
Given:
Volume of carbon monoxide = 18dm³
Unknown
Number of moles of carbon monoxide = ?
Solution:
To solve this problem;
1 mole of any gas at rtp occupies a volume of 22.4dm³
So;
x mole of carbon monoxide will occupy a volume of 18dm³ at rtp
22.4x = 18
x = [tex]\frac{18}{22.4}[/tex] = 0.81mole
Which best describes MgO?
1)This is an ionic compound; it is named
magnesium monoxide.
2)This is a covalent compound; it is named
magnesium monoxide.
3)This is an ionic compound; it is named
magnesium oxide.
4)This is a covalent compound; it is named
magnesium oxide.
What is the general form of a single replacement reaction
Answer: A. AB+C->CB+A
Explanation:
The chemical reaction includes the reactant and products. The single replacement reaction can be given as AB + C → CB + A. Thus option a is correct.
What is a single replacement reaction?A single replacement reaction is the exchange reaction that involves the substitution of a single element of the reactant with another element of the reactant species.
The reaction between zinc and copper chloride is a single replacement reaction as copper is replaced by zinc in the copper chloride compound to produce zinc chloride and copper.
Therefore, option A. AB + C → CB + A is the single replacement reaction.
Learn more about single replacement reaction here:
https://brainly.com/question/13903783
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_Li + __F2 → _LIF
How do I balance this?
Answer:
2Li + F₂ → 2LiF
Explanation:
The reaction expression is given as:
Li + F₂ → LiF
We are to balance the expression. In that case, the number of atoms on both sides of the expression must be the same.
Let use a mathematical approach to solve this problem;
Assign variables a,b and c as the coefficients that will balance the expression:
aLi + bF₂ → cLiF
Conserving Li: a = c
F: 2b = c
let a = 1, c = 1 and b = [tex]\frac{1}{2}[/tex]
Multiply through by 2;
a = 2, b = 1 and c = 2
2Li + F₂ → 2LiF
How would you solve this?
What is a disadvantage of using solar energy?
Help
Answer:
D, last one.
Explanation:
In order to use solar energy, we need solar panels. Which we need sun for it to heat up, and once there is the sun. The heat can hit the water, and cause the water to burn/boil
PLEASE ANSWER ITS DUE IN ABOUT AN HOUR!! What other body system does the diaphragm belong to?
Answer:
The respiratory system
Explanation:
Answer:
The diaphragm belongs to the respiratory system, digestive system, and muscular system.
I'm not too sure on the muscular system, but the other two 100%
Explanation:
Hopefully, this helps. :)
SEnD NuuuDdddeeeeSss I you acccalty do you will get crown
Urgent!!! Label these please!
Answer:
sorry but what is that what will do to thatPlease select the word from the list that best fits the definition
stage in a star's evolution formed as the core of a main sequence star uses up its helium and the outer layers escape into
Explanation:
Giant Gas Cloud. A star originates from a large cloud of gas. ...
Protostar. When the gas particles in the molecular cloud run into each other, heat energy is produced. ...
T-Tauri Phase. ...
Main Sequence. ...
Red Giant. ...
The Fusion of Heavier Elements. ...
Supernovae and Planetary Nebulae
H2O+O2=H202, how would I balance this equation?
Answer:
2H2O2→2H2O+O2
Explanation:
This reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.
Add 2 molecules of hydrogen peroxide and 2 molecules of water. Since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.
2H2O2→2H2O+O2
Which of the following options shows metallic bonding:
1.silver spoon
2.
bronze medal
3.
solid table salt
Answer:
bronze medal i guess
i hope its correct.
Explanation:
Answer:
silver spoon
Explanation:
i had this for castle learning and guessed this and it was right
4.Calculate the volume of 40g of Helium (He) at rtp.
Answer:
2.24dm³
Explanation:
Given parameters:
Mass of He = 40g
Unknown:
Volume of Helium = ?
Solution:
To solve this problem, we convert the given mass to number of moles.
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
molar mass of He = 4g/mol
Number of moles = [tex]\frac{4}{40}[/tex] = 0.1mole
So;
1 mole of gas at rtp occupies a volume of 22.4dm³
0.1 mole of He will occupy a volume of 0.1 x 22.4 = 2.24dm³
Oceans, and other bodies of water, are found on which layer of Earth?
Outer core
Mantle
Inner core
Crust
they are found on the crust
Answer:
crust
Explanation:
What information can be deduced from knowing which Group an element belongs?
A. Family name
B .Number of valence electrons
C. Chemical properties
D. All the above
Answer:
D. All of the above
Explanation:
Elements are being grouped in the "Periodic Table" in order to associate them with other elements that have similar properties. These elements also have the same number of "valence electrons" or electrons located in the outer shell. The groups are then classified into their "family names." For example, Group 1 is named "Alkali metals" because the elements within it are very reactive and have high conductive property. The valance electron of the elements in this group is "1."