Explanation:
kinetic energy = ½mv²
1800 = ½ × m × 11.2²
1800 = ½ × m × 125.44
3600 = 125.44m
m = 3600/125.44
m = 28.7 Kg
(NEED HELP ASAP)
Three treatments of different starting materials are listed.
Substance Characteristics
1
The substance was heated and then placed in an ice bath.
2
The substance was in a salt solution of 2M and later placed in a
solution of 4M to cause a reaction.
3
The substance was hammered and broken into pieces.
Which statement explains the treatments?
O Substance 1 was activated by a decrease in temperature, Substance 2 was activated by the change in
concentration, and Substance 3 decreased the surface area.
Substance 1 was activated by a decrease in temperature, Substance 2 was activated by the change in pressure,
and Substance 3 increased the surface area.
O Substance 1 was activated by the heat and inactivated by ice, Substance 2 was activated by the change in pressure,
and Substance 3 decreased the surface area.
O Substance 1 was activated by the heat and inactivated by ice, Substance 2 was activated by the change in
concentration, and Substance 3 increased the surface area.
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The statement explains the treatments is,
Substance 1 was activated by a decrease in temperature, Substance 2 was activated by the change in concentration, and Substance 3 decreased the surface area.
So, the substance was heated and then placed in an ice bath is correct one.
So, first option is correct one.
What are Characteristics of substance?The characteristics of substance are,
The substances changes their states at different temperature.Example: Water present in solid state at low temperature, water also present in liquid ans gaseous state at moderate or high temperature.
The concentration of substance is different.If surface area of the substance is higher than it reacts faster.learn about concentration,
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Why is boiling water a physical change
Answer:
it is cleaning the water and heating it
Answer:
When boiling the water, the water will begin to evaporate and thats the physical change.
Which part of an atom would be found orbiting the nucleus?
Answer:
electrons
Electrons are negatively charged particles that orbit the nucleus. The number of electrons depends on the element and it is an ion or not
Which of the following would make it easier for a plant to do photosynthesis?
O Colorful flowers
O Very large leaves.
Very tall stem.
O Short roots
How many moles of C are present in 0.728 moles of Benadryl
Mole measure the number of elementary entities of a given substance that are present in a given sample. 12.376 moles of carbon atoms are present in 0.728 moles of Benadryl.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. To see the total number of atoms of an element we need to multiply the stoichiometry to the number that is written on the foot of that element.
Benadryl is diphenhydramine with molecular formula C₁₇H₂₁NO.
Each molecule of Benadryl contains 17 carbon atoms
1 mole of Benadryl contains 17 moles of carbon atoms
0.728 moles of Benadryl contains = 0.728×17 moles of carbon atoms
0.728 moles of Benadryl contains=12.376 moles of carbon atoms
Therefore, 12.376 moles of carbon atoms are present in 0.728 moles of Benadryl.
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Angus, Hereford, and Holstein are common types of ___
breeds.
NEED HELP NOW
Answer:Cattle
Explanation:Cattle
What is a coefficient?
Answer:
in math it's " a numerical or constant quantity placed before and multiplying the variable in an algebraic expression (e.g. 4 in 4x y)."
In physics " a multiplier or factor that measures some property."
Explanation:
hope this is helpful!
Answer:
A coefficient is the number before a variable
Explanation:
A numerical or constant quantity placed before and multiplying the variable in an algebraic expression
Choose the options below that are true. (select all that apply) Select all that apply:
a. The rate law for a given reaction can be determined from a knowledge of the rate-determining step in that reaction's mechanism.
b. The rate laws of all chemical reactions can be determined directly from their net chemical equations.
c. The rate laws of bimolecular elementary reactions are second order overall.
d. The rate law for a given reaction can be determined from its reaction mechanism,
Answer:
a, c are true statements
Explanation:
First statement concludes that only the slower stage or the rate deciding phase of the reaction allows for the rate law to be calculated. This is true
The second declaration is not valid in all regards, because we can not evaluate the correct rate law by just observing the net equation. It needs to be determined experimentally.
In the third statement, most of the bimolecular reactions are second order in general, since two reactants exist. Hence, it is true
The fourth declaration is wrong. To measure the rate of each elemental phase accompanying the response, we must observe the rates
Fill in the blank
In a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride), ________
different colors are needed to
represent the different types of atoms. This represents a _______
equation because there are ____________
atoms of each element on the
reactants and products side of the equation. The scientific principle represented here is______.
Zinc + Hydrochloric Acid - Zinc Chloride and Hydrogen Gas
Zn + 2HCI - ZnCl2 + H2
Word bank -
13
the same number of
The Law of Conservation of Mass
unbalanced
zero
a different number of
The Law of Conservation of Water
balanced
Answer:
3; balanced; the same number of; The Law of Conservation of Mass
Explanation:
In a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride), 3 different colors are needed to represent the different types of atoms. This represents a balanced equation because there are the same number of atoms of each element on the reactants and products side of the equation. The scientific principle represented here is The Law of Conservation of Mass .
The graph below shows distance over time. Which of these situations
could be represented by this graph?
Pls answer quick
Answer:
the second option
Explanation:
look at the distance where the meet up at the house and the go to school
How many atoms are in 0.256 mol Fe?
For this one, you can use the formula:
# of atoms = # of moles * Avogadro's number
# of atoms = (0.256 mol) * (6.02 * 10^23)
# of atoms = 1.54 * 10^23 atoms
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Atoms are the smallest unit of molecules. In 0.256 mol of iron, there are 1.54 × 10²³ atoms.
What are atoms?Atoms are small entities of the compound or the molecule that can be measured by Avogadro's number. The number of atoms can be given as the product of the moles and the Avogadro's number.
If 1 mole of iron = 6.02 × 10²³
Then, 0.256 moles = 0.256 × 6.02 × 10²³
Therefore, 1.54 × 10²³ atoms of iron are present in 0.256 moles.
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I need to know why the particles at the surface in the image below have surface tension while the particles below the surface do not.
Which of the following is a redox reaction?
A. Single Replacement
B. Double Replacement
C. Acid/Base reaction
D. Precipitation reaction
Answer:
acid base reaction this is answer
Answer:
Double replacement .....
The molar mass of a sulfur molecule (S8) is
Explanation:
The molar mass of a sulfur molecule (S8)= 256g
Answer:
The Sulfur molecule has eight sulfur atoms thus the molar mass will be eight times the mass of one sulfur atom.
The atomic mass of S: 32.065
Molar mass= 8*32
= 256u
When the moon is in between the earth and the sun it is a
lunar eclipe is the answer
Answer:
solar eclipse
Explanation:
When the Moon passes between Sun and Earth, the lunar shadow is seen as a solar eclipse on Earth. When Earth passes directly between Sun and Moon, its shadow creates a lunar eclipse. Lunar eclipses can only happen when the Moon is opposite the Sun in the sky, a monthly occurrence we know as a full Moon.
What visible changes, in addition to precipitate formation, show that cations and anions have rearranged to form new products?
Answer:
Precipitation reactions
Explanation:
What is true about sunlight?
A.It is the source of all energy for plants and animals.
B.It is the source of most of the energy for plants and animals.
C.It is the source of very little energy for plants and animals.
D.It is the source of very little energy for plants and animals.
DONT USE UP THE POINTS I WILL REPORT YOU!
Tell me if your from connexus.
I believe your answer will be D. I say this because only some animals need sun, and only some plants need sun to grow.
is an oak tree a decomposer consumer or a producer?
Answer: producer
Explanation:
A buffer solution contains 0.345 M acetic acid and 0.377 M sodium acetate . If 0.0613 moles of potassium hydroxide are added to 250 mL of this buffer, what is the pH of the resulting solution ? (Assume that the volume does not change upon adding potassium hydroxide. )
Answer:
pH = 5.54
Explanation:
The pH of a buffer solution is given by the Henderson-Hasselbach (H-H) equation:
pH = pKa + log[tex]\frac{[CH_3COO^-]}{[CH_3COOH]}[/tex]For acetic acid, pKa = 4.75.
We calculate the original number of moles for acetic acid and acetate, using the given concentrations and volume:
CH₃COO⁻ ⇒ 0.377 M * 0.250 L = 0.0942 mol CH₃COO⁻ CH₃COOH ⇒ 0.345 M * 0.250 L = 0.0862 mol CH₃COOHThe number of CH₃COO⁻ moles will increase with the added moles of KOH while the number of CH₃COOH moles will decrease by the same amount.
Now we use the H-H equation to calculate the new pH, by using the new concentrations:
pH = 4.75 + log[tex]\frac{(0.0942+0.0613)mol/0.250L}{(0.0862-0.0613)mol/0.250L}[/tex] = 5.54Explain the difference in percent ionization in the two solutions. Match the words in the left column to the appropriate blanks in the sentences on the right.
a. left.
b. right.
c. larger.
d. smaller.
e. common ion effect.
f. formation of H3O+ by the salt.
g. addition of a weak base.
1. The percent ionization in the potassium formate solution is____than that in pure water because of the____.
2. The equilibrium for the dissociation of formic acid is shifted to the____by this addition, and a____amount of acid dissociates.
Answer:
1. The percent ionization in the potassium formate solution is smaller than that in pure water because of the common ion effect.
2. The equilibrium for the dissociation of formic acid is shifted to the left by this addition, and a smaller amount of acid dissociates.
Explanation:
The common ion effect refers to the effect on equilibrium that is observed when an ion that is already contained in the solution (common ion) is added to a solution. The addition of a common generally results in a shift in equilibrium positiont towards the removal of the common ion from solution. This is according to Le Châtelier's Principle which states that if an equilibrium becomes unbalanced, the reaction will shift to restore the balance.
The common ion effect decreases the ionization of a weak acid as the addition of more of an ion that is a product of this equilibrium will shift equilibrium towards removal of the ion.
Adding a common ion also decreases solubility, as the reaction shifts toward the left in order to annul the constraint of the excess ion in the product side of equilibrium.
The percent ionization in the potassium formate solution is smaller than that in pure water because of the Common ion effect. The equilibrium for the dissociation of formic acid is shifted to the left by this addition, and a smaller amount of acid dissociates.
What is Equilibrium law?Equilibrium law states that if any external effect is applied on the equilibrium state of any chemical reaction, then the equilibrium will shift towards that side where the effect will decrease.
Common ion effect occurs when the already present ion in the solution is further added to the solution which increases the concentration of that ion in the solution and equilibrium will shift towards the side where common ion effect will decreases.
That's why the percentage of ionization in the potassium formate solution is less than the percentage of ionization in pure water. And due to common ion effect equilibrium will shift towards the left side where dissociation decreases and the concentration of ions is also decreases.
Hence correct options are smaller, common ion effect, left and smaller.
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How do I balance coefficient equations
Answer:
In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.
Answer: When you balance a chemical equation, you change coefficients. You never change subscripts. A coefficient is a whole number multiplier. To balance a chemical equation, you add these whole number multipliers (coefficients) to make sure that there are the same number of atoms on each side of the arrow.
Explanation:
before phase change: molecules move around each other 15. The medicine in the diagram above has molecules that are moving around each other. The doctor needs to slow down the molecules enough to cause a phase change. How will she do this, and how will this affect the medicine? I She transfers energy ... a into the medicine until it is a liquid. b) into the medicine until it is a gas. C out of the medicine until it is a solid. d out of the medicine until it is a liquid. LE 1 21 Illuminate Education, Inc.
Answer:
She transfers energy out of the medicine until it is solid. So the answer would be C.
Explanation:
According to the forces of attraction , molecules can be slowed down by moving out of the medicine until it is a solid , it will decrease the rate of absorption of medicine.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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How do you think our understanding of genes might affect doctors ability to treat or prevent disease in the future?
Answer:
dentifying genetic variants Genome sequencing has the potential to improve the diagnosis of conditions caused by changes in the DNA and indicate what treatments may be most effective. Importantly, it may also red-flag treatments likely to cause adverse reactions.
Explanation:
Answer:
Identifying genetic variants Genome sequencing has the potential to improve the diagnosis of conditions caused by changes in the DNA and indicate what treatments may be most effective. Importantly, it may also red-flag treatments likely to cause adverse reactions.
Explanation:
what is full from of PCO
Answer:
Chemistry- Phosphaethynolate
Communication- Public Call Office
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Of the animals in the bottom row, which one is most likely to be a keystone species?
nuthatch
deer
frog
butterfly
Answer:
Deer
Explanatio
The deer is most likely to be a keystone species.
What is a Keystone species?This is defined as the organism which has a strong impact and defines the ecosystem.
The deer is a keystone species as many organisms depend on it as a source of food in the ecosystem.
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0.24 moles of a gaseous product from a reaction is collected in a 25.0-L container at a pressure of 300.0 kPa. Determine the temperature (in °C) at which the gas was collected.
Answer:
3428.58 °C
Explanation:
We'll begin by converting 300 KPa to atm. This can be obtained as follow:
101.325 KPa = 1 atm
Therefore,
300 KPa = 300 KPa × 1 atm / 101.325 KPa
300 KPa = 2.96 atm
Next, we shall determine the temperature. This can be obtained as follow:
Number of mole (n) = 0.24 mole
Volume (V) = 25 L
Pressure (P) = 2.96 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Temperature (T) =?
PV = nRT
2.96 × 25 = 0.24 × 0.0821 × T
74 = 0.24 × 0.0821 × T
Divide both side by 0.25 × 0.0821
T = 74 / (0.24 × 0.0821)
T = 3755.58 K
Finally, we shall convert 3755.58 K to °C. This can be obtained as followb:
T(°C) = T(K) – 273
T(K) = 3755.58 K
T(°C) = 3755.58 – 273
T(°C) = 3428.58 °C
Thus, the temperature at which the gas was collected is 3428.58 °C
What is the molality of a solution of naphthalene dissolved in chloroform if the solution has a boiling point of 63.2 °C?
Answer:
3.6
Explanation:that is right
What is the volume of an object with the mass of 7.9 grams in the density of 2.28g/ml.
Answer:
3.7mL is the volume of the object
Explanation:
To convert the mass of any object to volume we must use density that is defined as the ratio between mass of the object and the space that is occupying. For an object that weighs 7.9g and the density is 2.28g/mL, the volume is:
7.9g * (1mL / 2.28mL) =
3.7mL is the volume of the objecth-h+cl+cl____2h-cl... calculate the energy needed to break the bond
2.
C₂H6
+
O2
H20
+
CO2
Answer:
[tex]C_{2}H_{6} +O_{2} -> H_{2}O+CO_2[/tex] is a combustion reaction
Explanation:
The reaction is a combustion since you have a hydrocarbon reacting with oxygen to form water and carbon dioxide.
The balanced equation is: [tex]2C_{2}H_{6} +7O_{2} ->4H_{2}O+6CO_2[/tex]
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