Answer:
Half-life = 2.7 days
Explanation:
The radioactive decay of an isotope follows the equation:
Ln[A] = -kt + ln[A]₀
Where [A] could be taken as the amount of A after t time, k is decay constant, [A]₀ initial amount of A.
Replacing to solve k:
Ln[3.125g] = -k*13.5days + ln[100g]
-3.465736 = -k*13.5days
k = 0.2567days⁻¹
Half-life is:
half-life = ln2 / k
Half-life = 2.7 days
Mallory combines two chemicals and notices that each chemical retains its original properties. What did Mallory form?
O a mixture
a compound
an element
an atom
Answer:
A mixture
Explanation:
The process that is used by organisms to convert complex organic molecules into carbon dioxide and water molecules, with an overall release of energy is
1 photosynthesis
2 Plants
3 cellular respiration
4 Calorie
Examine the food chain below: In this specific food chain, the _______ eats plants for food. A. caterpillar B. sunshine C. bobcat D. leaf
Help me with chemistry! I got this answer wrong , what would be the right one?
Answer: Number 3
Explanation: Electronegativity is a measure of how strongly atoms attract bonding electrons to themselves.
I think, I could be wrong though.
Can someone please help, 20 points
Draw 3-ethyl-2,4-dimethyl octanoic acid
3-ethyl-2.4-dimethyl-octanoic acid
Porque una solución acuosa 30g de sal en 80g de agua Que % de masa de sal contiene
Given :
An aqueous solution of 30g of salt in 80g of water.
To Find :
The % mass of the salt.
Solution :
Mass percentage of the salt is given by :
[tex]Mass \ \% = \dfrac{Mass \ of \ salt}{Mass \ of \ salt + Mass \ of \ water}\\\\Mass \ \% = \dfrac{30}{30 + 80 }\times 100 \%\\\\Mass \ \% = 27.27\ \%[/tex]
Hence, this is the required solution.
ZnSO4 +
+
LINO, → ---- Zn(NO3)2
+
Li,SO4
Balanced equation
Answer:
ZnSO4 + 2LiNO3 → Zn(NO3)2 + Li2SO4
Explanation:
There's many resources on web that can assist you with this concept:
https://en.intl.chemicalaid.com/tools/equationbalancer.php
https://www.webqc.org/balance.php
What is the molarity of a solution made from dissolving 3.0 moles of KCl in 500 mL of solution?
A. 750 M KCl solution
B. 3.0 M KCl solution
C. 0.06M KCl solution
D. 6M KCl solution
Answer:
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how much water should be added to 80 grams of common salt so as to obtain 20% salt solution
Balance the following equation:
-_MgCO3 → _MgO + __CO2
Answer:
Decomposition
Explanation:
Magnesite = Magnesium Oxide + Carbon Dioxide
What are five different types of air pollutant each
Which of the following sequence is correct for the oxidation of alcohol?
A. Ethanol-Ethanal-Ethanoic acid
B. Ethanol-Ethanoic acid- Ethanal
C. Ethanal-Ethanol-Ethanoic acid
D. Ethanal-Ethanoic acid-Ethanol
When temperature drops, (for example from 20 degrees celsius to 10 degrees celsius)
a.) energy increases
b.) particles move slower
c.) particles collide more often
d.) pressure increases
Answer:
In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.
In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.
That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.
Conclusion: 20 degree change represents a larger change in Celsius scale.
Explanation:
In the Celsius scale each degree is one part of 100 degrees. This is because in this scale the difference between boiling and freezing temperatures of water is 100 ° - 0 ° = 100 °, so one degree Celsius is one part of 100.
In the Farhenheit scale, each degree is one part of 180 degrees. This is because in this scale the difference between the boiling and freezing temperatures are 212 ° - 32 ° = 180°, so one degree Fahrenheti is one part of 180.
That means that 1 °C is a larger amount than 1 °C, so 20°C is a larger amount than 20°F.
Conclusion: 20 degree change represents a larger change in Celsius scale.
The reaction of an acid and a base will always produce what kind of salt?
A.
a combination of the cation from the acid and the anion from the base
B.
a combination of the cation from a strong base and the anion from a weak acid
C.
neutral salts from the cation of a strong base and the anion from a weak acid
D.
basic salts from the cation of a strong base and a strong acid
E.
depends on the strength of the acid and the base
Explanation:
E maybe i am not sure or C
Which tool was most likely used in a procedure if the lab report shows that 300 mL of water was used?
A volumetric flask
A thermometer
A pipette
A graduated cylinder
The answer is A - Volumetric Flask!
Can someone answer question 3 ASAP please
Answer:
Molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. Molecules must collide with the proper orientation. A collision that meets these two criteria, and that results in a chemical reaction, is known as a successful collision or an effective collision.
A gas occupies a volume of 2.50 L at a pressure of 350.0 kPa. If the temperature remains
constant, what volume would the gas occupy at 1750 kPa ?
1. 12.5 L
2. 5.00 L
3. 1.40e+2L
4. 0.500 L
Answer:
V₂ = 0.5 L
Explanation:
Given that,
Initial volume, V₁ = 2.5 L
Pressure, P₁ = 350 kPa
New pressure, P₂ = 1750 kPa
We need to find the new volume if the temperature remains constant. The mathematical relation between P and V is :
[tex]P\propto \dfrac{1}{V}\\\\or\\\\\dfrac{P_1}{P_2}=\dfrac{V_2}{V_1}[/tex]
Where
V₂ is new volume
So,
[tex]V_2=\dfrac{P_1V_1}{P_2}\\\\V_2=\dfrac{350\times 2.5}{1750}\\\\V_2=0.5\ L[/tex]
So, the new volume is equal to 0.5 L.
A piece of wood burns to form ash. ____C_____ Water evaporates into steam. ____P_____ A piece of cork is cut in half. ____P_____ A bicycle chain rusts. _____C______ Food is digested in the stomach. _____C______ Water is absorbed by a paper towel. _____P______ Hydrochloric Acid reacts with zinc. _____C______ A piece of an apple rots on the ground. ____C_____ A tire is inflated with air. ____P____ A Plant turns sunlight, CO2, and water into sugar and oxygen. ____C_____ Sugar dissolves in water. ____C_____ Eggs turn into an omelet. _____C______ Milk sours. _____C______ A popsicle melts. _____P_______ Turning brownie mix into brownies. _____C______
Answer:
A piece of wood burns to form ash - Chemical change
Water evaporates into steam - Physical change
A piece of cork is cut in half. __ Physical change
A bicycle chain rusts. _____Chemical change
Food is digested in the stomach. _____Chemical change
Water is absorbed by a paper towel. _____Physical change
Hydrochloric Acid reacts with zinc. _____Chemical change
A piece of an apple rots on the ground. ____Chemical change
A tire is inflated with air - Physical change
A Plant turns sunlight, CO2, and water into sugar and oxygen. _Chemical change
Sugar dissolves in water - Physical change
Eggs turn into an omelet. _____Chemical change
Milk sours. Chemical change
A popsicle melts. _____Physical change
Turning brownie mix into brownies. Chemical change
Explanation:
Matter undergoes two types of changes: physical changes and chemical changes.
A physical change is one that affects only the physical properties of a substance such as colour, size, shape, etc., and in which no new substances are formed. Physical changes are easily reversible.
Chemical changes are changes which affect the chemical characteristics and properties of a substance such as reactivity, acidity, basicity, etc., resulting in the formation of new substances.
The following changes below are categorized as either physical or chemical changes based on which of the properties of the substance is affected and whether new substances result or not.
A piece of wood burns to form ash - Chemical change
Water evaporates into steam - Physical change
A piece of cork is cut in half. __ Physical change
A bicycle chain rusts. _____Chemical change
Food is digested in the stomach. _____Chemical change
Water is absorbed by a paper towel. _____Physical change
Hydrochloric Acid reacts with zinc. _____Chemical change
A piece of an apple rots on the ground. ____Chemical change
A tire is inflated with air - Physical change
A Plant turns sunlight, CO2, and water into sugar and oxygen. _Chemical change
Sugar dissolves in water - Physical change
Eggs turn into an omelet. _ Chemical change
Milk sours - Chemical change
A popsicle melts. _____Physical change
Turning brownie mix into brownies - Chemical change
29.) What charge would you expect from a Group 1 atom when it becomes an ion?
a.) 2-
b.) 2+
c.) 1-
d.) 1+
Answer:
d
Explanation:
It is 1+ because when the periodic table is drawn well into there groups become cations
Which equation correctly represents the dissociation of a strong acid in water?
Question 26 options:
CH3COOH ↔H++ CH3COO−
NaOH →Na++OH−
HCl →H+ +Cl−
NH3+ H2O↔ NH4++ OH−
The equation that correctly represents the dissociation of a strong acid in water is as follows: HCl → H+ + Cl−
What is acid dissociation?Acid dissociation is the process by which an acid breaks up into it's constituent ions in an aqueous solution.
Acids are known to contain hydrogen ions (H+), hence, dissociate into H+ and an anion.
A strong acid like HCl dissociates completely in an aqueous solution while a weak acid does not dissociate completely.
According to this question, hydrogen chloride (HCl) is said to dissociate into hydrogen ion (H+) and chloride (Cl-) according to the following expression:
HCl → H+ + Cl−
Learn more about acid dissociation at: https://brainly.com/question/4363472
#SPJ1
10 ejemplos de disoluciones identificando el soluto y el solvente y el tipo de disolucion que corresponde
Answer:
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Witch statement about greenhouse gases is false
Answer:
???
Explanation:
does neutrons have a positive charge
Answer:
neutrons have no charge
Answer:
No it doesnt
Explanation:
Inicialmente una muestra de neón tiene un volumen de 2,50 L a 15 °C. ¿Cuál es la
temperatura en °C, cuando el volumen de la muestra cambia a cada uno de los
siguientes volúmenes, ¿manteniéndose la presión constante?
a. 5,0 L b. 1250 ml c. 7,50L d. 3550 ml
naoooooooo seiiiiiiiii !!!!!!!!!!!!!!
3.What is evaporation?
(1 Point)
change from solid to liquid
change from solid to gas
change from liquid to solid
change from liquid to gas
change from gas to solid
change from gas to liquid
4.What happens to the motion of particles after evaporation?
(1 Point)
faster
slower
5.What happens to the kinetic energy of particles after evaporation?
(1 Point)
increased
decreased
6.What happens to the distance between particles after evaporation?Immersive Reader
(1 Point)
smaller
wider
28. Which of the following reactions at equilibrium would NOT be affected by volume
changes at constant temperature?
a. 2 CO(g) + O2(e) < > 2 CO2(g)
b. 2 NO2(g) → N2048)
c. 2 NO(g) + 3 F2(g) → 2 F3NO(e)
d. O3(e) + NO(g) + > NOzle) +
e. None of the above.
Ozig)
Answer:
Explanation:
is the
A student observed an example in which all of the offspring of an organism have the same
genetic material, which is identical to the parent organism. Based on this the student can
conclude that this organism
A.
is unicellular
B.
makes its own food.
C.
reproduces asexually.
D.
has a lot of genetic diversity.
How many moles of aluminum sulfide will be produced if 12 moles of Sg react?
Answer:
Molar mass = [9(12.0)+8(1.01)+4(16.0)] = 180.1 g/mol Moles = 112 g 1 mol x 180.1 g = 0.622 mol (3 sig figs)
Explanation:
If there are 10.00 moles of ascorbic acid(C6H8O6), what is the mass of ascorbic acid?
Given
no of moles = 10 mol
we know that mass of 1 mole ascorbic acid is 176.12,
mass id 10 mole of ascorbic acid = 10× 176.12
= 1761.2 g
Answer - 1761.2 grams
a. Use VSEPR to predict bond angles at the marked atom. The angle is : _______ degrees. The expected hybridization at the marked atom is _____ . b. Use VSEPR to predict bond angles at the marked atom. The angle is : _______ degrees. The expected hybridization at the marked atom is _____ .
Answer: Hello your question is incomplete attached below is the complete question with the missing diagrams
a) The angle = 120°
hybridization = sp2
b) The angle = 120°
hybridization = sp2
Explanation:
a) using VSPER to predict bond angles
Given that there is the presence of 1 double bond to C and 2 single bonds one to C and one to H around the marked atom which equals 3 sets of electrons surrounding the central atom.
hence according to VSPER theory the angle = 120° while the Hybridization = sp2
b) Using VSPER to predict bond angles at marked atom
Given that there is There is 1 double bond to C and 2 single bonds to the different C atoms respectively around the marked atom, which makes 3 sets of electorns surrounding the central atom
hence according to VSPER theory the angle = 120° while the Hybridization = sp2