please help timed !! due rn !! What happens to particle motion as two substances come to thermal equilibrium?
Answers
Answer:
When two substances that are of different temperatures are brought together and there is heat transfer such that the substances come to thermal equilibrium, the effect on the particle motion are as follows
1) The particle motion of the hotter body reduces, because its temperature reduces
2) The particle motion of the colder body increases, because its temperature increases
3) For gases, the volume and or pressure reduces for the hotter body, and if the temperature of the gas falls below the boiling point temperature, the gas will change into liquid
For the colder gas, only the volume and or pressure increases and the temperature rises
4) For liquids, if the temperature of the hotter liquid falls below the melting point, the hotter liquid will become a frozen solid
For the the colder liquid, if the temperature is raised above the boiling point, the liquid changes into gas and the temperature does not rise above the boiling point temperature, until all the cold liquid has evaporated
5) For solids, the vibration of the particles of the hotter substance reduces and the solid becomes more brittle
For the colder body, the rise in temperature causes an increase in vibration of the particles, and if the temperature rises above the melting point, the colder solid will begin to melt
Explanation:
Related Questions
How does a nucleus maintain its stability even though it is composed of many particles that are positively charged? The neutrons shield these protons from each other. The Coulomb force is not applicable inside the nucleus. The strong nuclear forces are overcoming the repulsion. The surrounding electrons neutralize the protons.
Answers
A nucleus maintains its stability despite being composed of positively charged particles due to the strong nuclear force that overcomes the repulsion between the protons.
The neutrons in the nucleus play a crucial role in maintaining stability. Neutrons have no charge and do not contribute to the electrostatic repulsion. Their presence helps to increase the attractive nuclear force, balancing the repulsive force between protons. This shielding effect allows the nucleus to remain stable.
Another important factor is that the Coulomb force, which describes the electrostatic repulsion between charged particles, is not applicable at the nuclear level. The range of the Coulomb force is limited, and its influence diminishes at very short distances inside the nucleus. Instead, the strong nuclear force takes over and becomes the dominant force, binding the protons and neutrons together.
Additionally, the surrounding electrons in an atom contribute to the nucleus's stability. Electrons are negatively charged and are located in the electron cloud surrounding the nucleus. Their negative charge helps neutralize the positive charge of the protons, reducing the overall electrostatic repulsion within the atom. This electron-proton attraction further contributes to the stability of the nucleus.
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I kinda need help pla
Answers
Which statement is true about the potential energy diagram for an exothermic reaction? (5 points)
Answers
Answer:
Products have less potential energy than reactants.
Explanation:
Let's remember the concept of an exothermic reaction: a chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings are gaining heat from the system, the temperature of the surroundings increases.
Now, let's see how looks a potential energy diagram for an exothermic reaction:
This represents that the products have less potential energy than reactants.
Calculate either [H30), (OH), or pH for each of the following solutions at 25°C. a. Solution B: [H30*] = 9.87x10-M; [OH ) = (molar) b. Solution C: [HCl) = 0.123 M; PH= c. Solution D: pH = 2.1; [OH-] = (molar)
Answers
a. Solution B: [H₃O⁺] = 9.87x10⁻⁹ M; [OH⁻] = (molar)
b. Solution C: [HCl] = 0.123 M; pH =
c. Solution D: pH = 2.1; [OH⁻] = (molar)
a. In Solution B, the concentration of hydronium ions ([H₃O⁺]) is given as 9.87x10⁻⁹ M. This indicates the acidity of the solution. The concentration of hydroxide ions ([OH⁻]) is not provided.
b. In Solution C, the concentration of hydrochloric acid ([HCl]) is given as 0.123 M. To determine the pH, we need to calculate the negative logarithm of the hydronium ion concentration. pH = -log[H₃O⁺].
c. In Solution D, the pH is given as 2.1. This indicates the acidity of the solution. The concentration of hydroxide ions ([OH⁻]) is not provided.
To calculate the concentration of hydroxide ions ([OH⁻]) or determine the pH for each solution, more information is needed. Without the complete data, it is not possible to provide precise calculations or specific answers.
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Bohr Model of Hydrogen
Answers
can u answer this only 5 numbers
Answers
The electronic configuration of Krypton is- 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6.
Compare a mixture and a compound. How are they alike?
Contrast a mixture and a compound. How are they different?
Answers
Answer:
gnzl8303
gnzl8303vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
Explanation:
Answer:
how they are alike: Both compound and mixture are combined in a definite ratio or in any proportion. Both compound and mixture consist of two or more substances/elements. Both compounds and mixtures have physical and chemical properties.
how they are different: The chemical composition of compounds is always fixed. A mixture can have a variable composition of the substances forming it. Mixtures can either be homogeneous or heterogeneous in nature. The constituents of a compound can only be separated by either chemical or electrochemical methods (like extraction).
Explanation:
Which of the following is true about the variables in an experiment?
A.
All variables should be kept the same.
B.
All variables should change.
C.
One variable should be kept the same and at least two variables should change.
D.
One variable should change and the others should be kept the same
(middle school)
Answers
Answer:
D. One variable should change and the others should be kept the same
Explanation:
Variable in an experiment are defined as the things that changes. There are three variables in an experiment: dependent, independent, and controlled.
Independent variable is defined as the variable which is changed by researcher during an experiment and it influence the dependent variable to be changed. Controlled variables are required to be constant in an experiment and observe them carefully.
In an experiment, it is important to change only one variable that is independent variable because changing other variables can make the result confusing and if only one variable will be changed, it would be easy to observe changes in other variables.
Hence, the correct answer is "D. One variable should change and the others should be kept the same".
What is the equation for the acid dissociation constant, Ky, of HE?
HF(aq) + H0(!) H0+(aq) + F(aq)
+
P
Answers
The acid dissociation constant (Ka) is a measure of the strength of an acid in solution. It is the equilibrium constant for the dissociation of a weak acid into its conjugate base and a proton. For the given reaction:
HF(aq) + H2O(l) ⇌ H3O+(aq) + F-(aq)
The equation for the acid dissociation constant (Ka) is:
Ka = ([H3O+][F-]) / [HF]
Ka represents the acid dissociation constant, and for the reaction involving HF and H2O, the equation is Ka = ([H3O+][F-]) / [HF].
The acid dissociation constant (Ka) helps determine the strength of a weak acid in solution. For the dissociation of HF in water, the Ka equation is given by Ka = ([H3O+][F-]) / [HF].
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7. When a log is thrown on a fire it seems to lose weight; what happens to its physical mass?
a. It disappears
b. It is released into the air
C.
It becomes energy
d. The log does not change weight or size
Answers
Answer:I think it would be D.
Explanation:The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
As the first five elements in Group 14 are considered in order from top to bottom, there are changes in both the
A
electronegativity values and number of first shell electrons
B
electronegativity values and atomic radii
C
number of valence shell electrons and number of first shell electrons
D
number of valence shell electrons and atomic radii
Answers
Answer:
A
Explanation:
beacause in both the electronegativity values and number of first she'll electrons
In group 14 from top to bottom there are changes in both the electronegativity values and atomic radii changes.
What are groups?Groups in the periodic table are the columns in which elements are present which all are having same number of valence electrons.
On moving top to bottom in the 14th group of the periodic table:
Atomic size of the elements increases and electronegativity decreases.Number of electrons in the first shell of all elements will be same and in the outer most shell is also same.Hence electronegativity values and atomic radii changes.
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ethylene glycol, c2h6o2, is infinitely miscible (soluble) in water. it is a nonelectrolyte that is used as antifreeze. what is the lowest possible melting point for engine coolant that is 29.7% ethylene glycol? the kf for water is 1.86 oc/m. enter your answer in units of degrees celsius.
Answers
The lowest possible melting point for engine coolant that is 29.7% ethylene glycol is -12.85° Celsius.
Depression in freezing or melting point can be given by using the formula:
\(T_{f} = i\) × \(K_{f}\) × \(m^{}\), where:
'i' is the vant hoff factor, '\(K_{f}\)' is the freezing point constant for water, and 'm' is the molality. as we know that, molality, m, can be given by the formula:
Molaltity = \(\frac{Mass-of -ethylene -glycol}{Molar-mass-of-ethylene-glycol * Mass-of-water-in-kg}\)
Mass of ethylene glycol = 30 % of 100 g solution:
\(\frac{29.7}{100}\) × \(100^{}\) = 29.7g, rounding it off to 30 g
Mass of water = 100 - 30 = 70 g= 0.070 kg (1000g = 1kg)
Given, \(K_{f}\), freezing point constant for water = 1.86° C/m
Thus, putting all these values in the above equation, we get:
\(T_{f}\) = 1 × 1.86 × 30/ 62g/mol × 0.070
= 12.85° C (freezing point of 29.7% of ethylene glycol)
Now, calculating the lowest possible melting point:
Δ\(T_{f}\) = \(T_{} - T_{f}\) = 0 - 12.85 = -12.85° C
[ freezing point for water is 0° C]
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If 10.0 grams of sodium phosphate are reacted, what mass of barium nitrate is
required?
Answers
Answer: The mass of barium nitrate required is 23.91 g
Explanation:
The number of moles is defined as the ratio of the mass of a substance to its molar mass.
The equation used is:
\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)
Given mass of sodium phosphate = 10.0 g
Molar mass of sodium phosphate = 163.94 g/mol
Plugging values in equation 1:
\(\text{Moles of sodium phosphate}=\frac{10.0g}{163.94g/mol}=0.061 mol\)
The chemical equation for the reaction of sodium phosphate and barium nitrate follows:
\(3Ba(NO_3)_2+2Na_3PO_4\rightarrow Ba_3(PO_4)_2+6NaNO_3\)
By the stoichiometry of the reaction:
If 2 moles of sodium phosphate reacts with 3 moles of barium nitrate
So, 0.061 moles of sodium phosphate will react with = \(\frac{3}{2}\times 0.061=0.0915mol\) of barium nitrate
Molar mass of barium nitrate = 261.337 g/mol
Plugging values in equation 1:
\(\text{Mass of barium nitrate}=(0.0915mol\times 261.337g/mol)=23.91g\)
Hence, the mass of barium nitrate required is 23.91 g
What are the number of atoms in gallium
Answers
Answer: 31! hope this helps!
Explanation:
The students repeat their experiment on a 90.0 g metal cube, initially at 115.0 °C, and observe that the metal releases 2421.6 J of heat when it is cooled to a final temperature of 28.9 °C.
What is the specific heat of the metal?
*
0.31 J/g°C
0.93 J/g°C
2316.66 J/g°C
3.20 J/g°C
Answers
According to fundamental thermodynamics, a material has more thermal energy the hotter it is. The heat required to raise the heat content of one mole of material by precisely one degree Celsius is known as the heat capacity or Cp. Here the specific heat of the metal is -0.312 J / g°C. The correct option is A.
The amount of energy needed to raise a material's heat content by precisely 1°C per gram is known as specific heat or Csp. Therefore, a substance's heat capacity is the amount of heat needed to raise its overall temperature by one degree.
The heat capacity is known as the specific heat capacity or the specific heat if the substance's mass is unity.
The equation is:
q = m × cΔT
c = q / mΔT
2421.6 / 90.0 (28.9 - 115.0) = -0.312 J / g°C
Thus the correct option is A.
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what is the chemical formula for molybdenum(vi) sulfide
Answers
Answer: Mo2S6
Explanation: Only transition metals have Roman numerals. Metals first then nonmetals
3. Calcium phosphate (Ca3(PO4)2) has the solubility product Ksp 2.07x10-33. For the study of a calcium dependent enzyme, a biochemist is considering to prepare a 0.1 M phosphate buffer pH 7.5, which is also 10 mM with respect to CaCl2. Is it possible to prepare such a buffer ? Reason your answer by a calculation
Answers
The low concentration of phosphate that would form due to the precipitation of calcium phosphate makes it impossible to prepare a 0.1 M phosphate buffer pH 7.5 which is also 10 mM with respect to \(CaCl_2\).
To determine whether it is possible to prepare a 0.1 M phosphate buffer pH 7.5, which is also 10 mM with respect to \(CaCl_2\), we need to calculate the concentration of \(Ca_3(PO_4)_2\) that will form in the solution.
Firstly, let's consider the dissociation of \(Ca_3(PO_4)_2\) in water:
\($\mathrm{Ca_3(PO_4)_2(s) \rightleftharpoons 3 Ca^{2+}(aq) + 2 PO_4^{3-}(aq)}$\)
The solubility product expression for \(Ca_3(PO_4)_2\) is:
\($K_{sp} = [\mathrm{Ca^{2+}}]^3 [\mathrm{PO_4^{3-}}]^2$\)
where Ksp \(= 2.07 \times 10^{-33\)
We can assume that the concentration of \(Ca_2^+\) is 10 mM, so:
\($K_{sp} = (10\ \mathrm{mM})^3 [\mathrm{PO_4^{3-}}]^2$\)
Solving for [\($\mathrm{PO_4^{3-}}$\)], we get:
\($[\mathrm{PO_4^{3-}}] = \sqrt{\frac{K_{sp}}{(10\ \mathrm{mM})^6}} = 2.6\times 10^{-14}\ \mathrm{M}$\)
This concentration of phosphate is much lower than the desired concentration of 0.1 M for the buffer. Therefore, it is not possible to prepare a 0.1 M phosphate buffer pH 7.5 that is also 10 mM with respect to \(CaCl_2\), as the addition of \(CaCl_2\) will cause precipitation of calcium phosphate due to its low solubility product constant. The biochemist may need to consider alternative buffer systems or find a way to avoid the formation of calcium phosphate in experimental conditions.
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Other than carbon being relatively small, what is another reason that carbon can form so many compounds? the ability to form four covalent bonds the ability to change shape the ability to form a diatomic molecule the ability to split its electrons
Answers
Answer:
Ability to form four covalent bonds.
Explanation:
Carbon is the first member of group 14. It is essentially a nonmetal. It is a small atom which regularly exhibits tetra valency. This means that carbon is able to form four covalent bonds to four chemical species which may be the same or different each time. This leaves room for many different possible combination patterns of carbon with other chemical species.
Hence carbon forms a very large number of compounds due to its small size and its ability for form four covalent bonds to other chemical species in any bonding situation.
Answer: the ability to form four covalent bonds
Explanation:
Drought is a weather condition. true or false
Answers
Answer:
true
Explanation:
drought is a period of unusually persistent dry weather that persists long enough to cause serious problems such as crop damage and/or water supply shortages. The severity of the drought depends upon the degree of moisture deficiency, the duration, and the size of the affected area.
Define valence electrons.
Answers
Answer:
Electrons on the outermost shell of an atom. They are responsible for the chemical properties of an atom.
1. The author says that bog bodies were discovered as long ago as the 1600s, but the only ones existing today are those found after the late 1800s. What hap- pened to the earlier bog bodies?
Answers
Answer:
The earlier bog bodies that were discovered in the 1600s might have not been preserved properly due to a lack of knowledge on how to preserve them or a lack of awareness of their significance. It is also possible that they might have decayed and decomposed over time and not survived till the present day. However, the bog bodies found after the late 1800s were preserved and studied extensively due to the increasing awareness and understanding of their historical and archaeological significance.
Explanation:
Hope this helped!! Have a great day/night!!
What are 2 extensive physical properties of water?
Answers
Explanation:
surface tension and heat of vaporization
if an atom has an atomic number of 7 and a mass of 15, how many electrons does it contain
Answers
The atomic number for any element is the number of protons in its atomic nuclei. In a neutral atom, the number of electrons are the same as the number of protons. The atomic mass (mass number) is the sum of the protons and neutrons in the nucleus. Mass number can vary due to the fact that the number of neutrons can vary.
Energy that carries sound
Answers
.........
what is an example of taking action or doing service in the cement industry
Answers
Answer:
mining of clay limestone and then heated to a certain temperature of 1450⁰ in a cement kiln
Calculate q, the heat released in each reaction.
Use the equation q = cmAT.
(Use c = 4.18 J/g °C and the total mass, m.)
Record to 2 significant figures.
Reaction 1: blank J
Reaction 2: blank J
Answers
The heat released in each reaction is:
Reaction 1: 3700J
Reaction 2: 3200J
What is heat?
Heat is a transfer of kinetic energy from one medium or object to another or from an energy source to a medium or object. A similar energy transfer can be done in three ways: radiation, conduction, and convection.The standard unit of heat in the International System of Units( SI) is the calorie( cal), which is the quantum of energy transferred needed to raise the temperature of one gram of pure liquid water by one degree Celsius, assuming that the temperature of the water is advanced. advanced than the freezing point and lower than the boiling pointTo know more about heat, click the link given below:
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Benedict College E360 xG The number of second o x The cis isomer of the 1.3-diethyl cyclobutane is: CHyCH2 CH CH CH CHy CH CHs OA ?? oc Which is more stable,cis-1-ethyl-3-methylcyclohexane or trons-1-ethyl-3-methylcyclohexane? O cis trans The number of second degree (2") hydrogens in the structure below is ViewSonic
Answers
A cyclic diallylamine called 1-ethyl-3-methylcyclohexane is a feedstock used to create methicillin-resistant Staphylococcus aureus (MRSA).
Describe trons-1-ethyl-3-methylcyclohexane or methylcyclohexane.An organic substance with the chemical formula CH3C6H11 is methylcyclohexane. It is a white liquid with a little odor that is categorized as a saturated hydrocarbon.As a solvent, methylcyclohexane is employed. Toluene is the principal product of its conversion in naphtha reformers. [4] Some correction fluids (like White-Out) also use methylcyclohexane as a solvent.Because one methyl group is attached to one carbon of the cyclohexane ring, methylcyclohexane is a monosubstituted cyclohexane.This monosubstituted methylcyclohexane has the lowest energy form when the methyl group is located equatorially as opposed to axially.The idea of A value embodies this equilibrium. Because there are axial hydrogen atoms on the same side of the ring while the methyl group is in the axial position, there is steric crowding (steric strain) experienced by the methyl group (known as the 1,3-diaxial interactions).To know more about methylcyclohexane visit:
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A 21.5 L sample of gas at 107 kPa has a temperature of 27.2 °C. What is the pressure of the gas
if it is transferred to a 32.6L container at 44.1 °C?
Answers
Answer:
The right answer is "74.516 kPa".
Explanation:
The given values are:
V₁ = 21.5 L
V₂ = 32.6L
P₁ = 107 kPa
T₁ =27.2°C+273
T₂ = 44.1 °C+273
As we know,
⇒ \(\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}\)
then,
⇒ \(P_2=\frac{P_1V_1T_2}{T_1V_2}\)
On substituting the given values, we get
⇒ \(=\frac{107\times 21.5\times (44.1+273)}{(27.2+273)\times 32.6}\)
⇒ \(=\frac{107\times 21.5\times 317}{300.2\times 32.6}\)
⇒ \(=\frac{729258.5}{9786.52}\)
⇒ \(=74.516 \ kPa\)
Which of the following is the correct model of C3H18?
Answers
Answer:
B.
General Formulas and Concepts:
Chemistry - Organic
HydrocarbonsBond-Line Notation: Each "arrow" point represents a carbon and the lines represent a bond between the carbons. Hydrogens are assumed added when drawing the molecular formulasExplanation:
We are given C₈H₁₈. We need a Bond-Line notation where there are 8 "arrow" points (which represent Carbon). We can disregard the Hydrogens as they are assumed to take the rest of the bonds.
Only option B has a value of 8 carbons, represented by the "arrow" points. Therefore, it is the correct answer.
When hydrogen peroxide is decomposed it produced water and oxygen. If you
start with 40g of reactant then how much water, by mass, will be produced?
*
Answers
Answer:
40
Correct option is A)
3dm
3
×
24 dm
3
1 mole
=0.125 moles of O
2
2H
2
O
2
⟶2H
2
O+O
2
2 moles of H
2
O
2
produces 1 mole of O
2
.
0.125 moles of O
2
requires 2×0.125 H
2
O
2
=0.25 moles of H
2
O
2
Concentration of H
2
O
2
=
0.1
0.25
=2.5 M
Hence, option A is correct.
Explanation: