Answer:
The decreasing in concentration occurs after 69.0s
Explanation:
A first order reaction follows the equation:
Ln [A] = -kt + ln[A]₀
Where [A] is the concentration of the reactant after time t
k is rate constant of the reaction
And [A]₀ is the initial concentration of the reactant
Replacing:
Ln 2.45x10⁻²M = -1.80x10⁻²s⁻¹*t + ln8.48x10⁻²
-3.709 = -1.80x10⁻²s⁻¹*t -2.467
-1.2416 = -1.80x10⁻²s⁻¹*t
69.0s = t
The decreasing in concentration occurs after 69.0s
Which of the following are solutions?
Choose more than one if needed
1. Gas dissolved in a liquid
2. Liquid dissolved in a liquid
3. Solid mixed with solid
4. Solid dissolved in a liquid
Answer:
3
Explanation:
1. Cierta muestra fue diluida así: 1 mL MP se agrega 4mL de agua, luego se extrae 0,5 mL y se lleva a 5 mL y de esta última se obtiene 0,2 y se añade 1,3 de diluyente. Calcule la dilución total.
Answer:
1/375
Explanation:
Primero se debe calcular el factor de dilución para cada dilución seriada. Para ello, se divide el volumen de muestra entre el volumen final de la solución diluida.
1) 1 mL en 1 mL + 4 mL = 5 mL
D1 = 1 mL/5 mL = 1/5
2) 0,5 mL en 5 mL
D2 = 0,5 mL/5 mL = 1/10
3) 0,2 mL en 0,2 mL + 1,3 mL = 1,5 mL
D3 = 0,2 mL/1,5 mL = 2/15
La dilución total se calcula como el producto de las diluciones seriadas realizadas:
DT = D1 x D2 x D3 = 1/5 x 1/10 x 2/15 = 1/375
Fluorine gas a 300 K occupies a volume of 500 mL. To what temperature should it be lowered to bring the volume to 300 mL?
The temperature should be lowered to 300K to bring the volume to 300mL.
What is temperature?Temperature is the degree of hotness or coldness of a place or a body. The SI unit of temperature is Kelvin.
What is volume?Volume is the amount of space occupied by matter. The SI unit of volume is cubic metre.
Using Charles law,
V1/V2 = T1/T2
Where, V1 and T1 are the initial volume and temperature
Similarly, V₂ and T₂ are the final volume and temperature.
Given:
V1 = 500mL
T1 = 300K
V2 = 300mL
T2 = ?
V1T2/V1 = V2T1/V1
T2 = V2T1/V1
= 300mL x 300K/500mL
T2 = 180K
Hence, the temperature should be lowered to 300K to bring the volume to 300mL.
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Plants have various levels of organization. At which level of organization are the smallest structures in a plant?
Cellular
Organ
Organism
Tissue
Name the gas that the limewater in the flask is testing for.
Answer:
Explanation:
Carbon dioxide is the answer I think.
Hope it helps...
Which reaction would cause an increase in entropy?
Answer:
The other guy is completely wrong.
The answer is B.SO2CI2 (g) > SO2 (g)+CI2(g)
Explanation:
A P E X
Which of the following is NOT a benefit of
using renewable energy sources?
Answer:
D, They produce fossil fuels
Explanation:
you can't just pull them out of nowhere
As the girl leaves her room, she flips the switch to turn off the light. Turning off the light make
A :a closed circuit
B :a series circuit
C :a parallel circuit
D :an open circuit
Answer:
A.
Explanation:
Which is the conjugate acid of HSO4
Answer:
sulfuric acid
Explanation:
The conjugate acid of HSO4 -1 is H2 SO4. Adding one hydrogen ion to the hydrogen sulfate ion generates the conjugate acid. Its name is sulfuric acid.
How are plate tectonics and the rock cycle connected? Select the best answer from the choices below.
a
The rock cycle keeps the plates from moving too far apart
b
Igneous rocks that form from magma are a major part of the rock cycle
c
The heat from the mantle that fuels plate tectonics also drives the rock cycle
d
Plate tectonics causes sedimentary rocks to turn into metamorphic rocks
What change in volume results if 75.0 mL of gas is cooled from 100.0 °C
to 0.00 °C
Answer:
Final volume v2 = 0 ml
Explanation:
Given:
Initial temperature = 100°C
Initial volume = 75 ml
Final temperature = 0°C
Find:
Final volume
Computation:
Using Charles law formula;
⇒ V1 / T1 = V2 / T2
Where
⇒ Initial temperature = T1
⇒ Initial volume = V1
⇒ Final temperature = T2
⇒ Final volume = V2
So,
⇒ 75 / 100 = V2 / 0
Final volume v2 = 0 ml
How many moles of F2 are required to produced 8.3 moles of HF
Convert 812.4 kPa into atm
Answer:
Explanation:
There are a series of unit used to measure PRESSURE. They include millimetre mercury (mmHg), atmospheric pressure (atm), kilopascal etc. These units of measurement are interconvertible i.e. can be changed from one unit to another.
Based on this question asking to convert
1 kilopascal = 0.00986923atm
Look at the diagram below, which shows an atom of an element. How many valence electrons does it have? Based on this, would the atom be reactive or unreactive?
1. The number of valence electrons the atom have is seven (7).
2. The atom is reactive
1. How do i determine the number of valence electron in the atom?
Valence electron is simply defined as the number of electron(s) present in the outermost shell of an atom.
Considering the diagram given from the question, the number of electrons in the outermost shell is seven (7).
Thus, we can conclude that the valence electron the atom have is seven (7)
How do i know if the atom is reactive or not?From the diagram given, we determine that the number of valence electrons present is 7. This means that the atom required 1 more electron to complete its octet configuration.
Thus, the atom will be very reactive in order to quickly attain a stable configuration.
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A slug travels the length of a log in 2 hours. If the slug's average speed is 1.5 cm / minute how long is the log
Answer:
The length of the log is 180 cm
Explanation:
From the question given above, the following data were obtained:
Time = 2 hours
Speed = 1.5 cm/min
Distance =?
Next, we shall convert 2 hours to minutes. This can be obtained as follow:
1 h = 60 mins
Therefore,
2 h = 2 × 60
2 h = 120 mins
Finally, we shall determine the Lenght of the log. This can be obtained as follow:
Time = 120 mins
Speed = 1.5 cm/min
Distance =?
Speed = distance / time
15 = distance / 120
Cross multiply
Distance = 1.5 × 120
Distance = 180 cm
Therefore, the length of the log is 180 cm
Answer:
180
Explanation:
What is a reducing agent?
Answer: Its an element or compound that loses (or "donates") an electron to an electron recipient (oxidizing agent) in a redox chemical reaction.
CREDIT: Wikipedia
Answer:A reducing agent typically is in one of its lower possible oxidation states and is known as the electron donor.
Example: Examples of reducing agents include the earth metals, formic acid, oxalic acid, and sulfite compounds.
The pH of a solution can be determined by using a
A. Filter paper
B. Potentiometer
C. Thermometer
D. pH paper
real answers plz not bots
Where are the places these minerals are found: Gold, Limestone and kaiolin.
Explanation:
Gold: The Kolar Gold Fields in Kolar used to be one of the major producers of gold in India, before it shut down. Presently the gold mines of Hutti and Raichur produce almost 84 per cent of the country’s gold. The other major centers of gold mining are Dharwad and Chitradurga. The gold mines produce about 3,000 kg’s of gold per annum. The district of Raichur is also famous for its silver deposits.
Limestone: It is another important mineral with an estimated 51,000 million tons. Karnataka has the largest limestone reserve in India. The districts of Gulbarga, Bagalkot, Belgaum, Shimoga and other Uttara Kannada districts are endowed with extensive high grade limestone. The present and consistent production of approximately 14 million tonnes provides for the cement plants in these districts.
China clay (kaolin) consisting dominantly of kaolinite is one of the most sophisticated industrial minerals with a host of applications, viz., in ceramics, refractories, paper coating, filler for rubber, insecticides, cement, paint, textiles, fertilizers and others including abrasives, asbestos products, fibreglass, chemicals, cosmetics, pharmaceuticals, electrical ware, foundry and glass.
The Department of Mining and Geology through their past investigation campaigns in parts of Kerala,identified two major china clay zones viz., the southern china clay zone between Thiruvananthapuram and Kundara (Thiruvananthapuram and Kollam districts) and the northern china clay zone between Kannapuram Madayi -Cheruthazham in Kannur district to Nileswarm - Manjeshwaram in Kasargod district. An estimated reserve of 172 million tonnes (probable reserve of 80 million tonnes and possible reserve of 92 million tonnes) of china clay of sedimentary and residual origin has been arrived at.
Kerala china clay is one of the finest quality clay and is world class. In fact, Kaolin marketed by English Indian Clays Ltd. (EICL), Thiruvananthapuram claims to have similar or even better properties compared to imported clays.
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Calculate the given mass in 0.5 mol. Of CH4
Answer:
8 grams
Explanation:
The molar mass of CH4 is about 16 grams per mol. So you get the answer by mutlitplying 0.5 by 16, (cancel out moles by placing 1 on the bottom of the fraction).
Answer:
8 (g)
Explanation:
[tex]m= n * M[/tex]
m= 0.5*(12+1*4)=0.5*16 =8 (g)
How do we designate recessive
genes?
A. They are male.
B. They are lower case letters.
C. They are female.
D. They are capital letters.
What is the tertiary consumer in this food chain?
A hawk
B lettuce
C snail
D thrush
Answer:
the hawk
Explanation:
in order it would be: producer, primary, secondary, tertiary
Answer:
the hawk is the tertiary consumer
The net force of a vehicle that is accelerating at a rate of 1.5 m/s2 is 1,800 newtons. What is the mass of the vehicle to the nearest kilogram?
Answer:
1.2kg or 1200kg
Explanation:
F = ma
net force = 1,800
m = ??
a = 1.5m/s^2
m = F/a = 1,800/1.5 or 1,800 x 10/1.5 x 10
= 18,000/15 = 1,200kg or 1.2kg
Thanks
In the following reaction, in which direction, left or right, will the equilibrium shift if the following changes are made?
2NO (g) + H2 (g) ⇌ N2O (g) + H2O (g) + 36 kJ (heat)
N2 O (g) is added
Equilibrium shifts (LEFT / RIGHT)
H2 (g) is added
Equilibrium shifts (LEFT / RIGHT)
Answer:
Shifts to the left.
Shifts to the right.
Explanation:
Based on Le Châtelier's principle, when a change occurs in a system in equilibrium, the system will try to counteract the change that was made.
In the equilibrium:
2NO (g) + H₂ (g) ⇌ N₂O (g) + H₂O (g) + 36 kJ (heat)
If N₂O is added, the equilibrium shifts to the left trying to decrease the concentration of N₂O added.
If H₂ is added, the equilibrium shifts to the right trying to decrease the concentration of H₂ added
Can you use carbon dioxide in the dark
Answer:
If you already have a solenoid, there is nothing wrong with running CO2 with the lights only. It will save CO2, and prevent excessive CO2 levels at night. Some think the CO2 should be up to max levels when the lights go on.
Explanation:
Write word equation of sodium reacts with chlorine to get sodium chloride
Answer:
Na+ + Cl-=NaCl
Explanation:
Sodium have +ions while Chlorine have - ions the ions will cancel and it will equal to NaCl
What happens with electrons when atoms form covalent bonds?
Answer:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.
Explanation:
A gas has a volume of 10.0 L at 20 degree Celsius. At what temperature does the gas have a volume of 20.0 L ?
Answer:
286 K
Explanation:
From the question,
Applying Charles law,
V/T = V'/T'.................... Equation 1
Where V = Initial Volume of gas, T = Initial Temperature of gas in Kelvin, V' = Final Volume of gas, T' = Final Temperature of gas in Kelvin
Make T' the subject of the equation
T' = V'T/V.................. Equation 2
Given: V = 10.0 L, V' = 20.0 L, T = 20°C = (20+273) = 293 K.
Substitute these values into equation 2
T' = (20×293)/10
T' = 586 K
Hence the temperature of the gas is 586 K
calculate the number of atoms in 112 g of iron.
Answer:
1 mole of iron (Fe) = 56 g (molar mass)
Since 56 g of iron = 1 mol.
Therefore, 112 g of iron= 1/ 56 ×112 mol = 2 mol.
Explanation:
Sn(IV) and Br
chemical formula
How can water affect the rock cycle?
Water can cause rocks to break into sediments through mechanical weathering.
Water can cause rocks to be buried deep underground.
Water can cause rocks to melt.
Water can causer rocks to break into sediments through chemical weathering.
Answer:
b
Explanation:
b because it's a physical change