The isotopes K-37 and K-42 have the same
Oliver arrives at the beach to meet his friend Farah. As he walks across the sand, the sand feels hot and burns his bare feet. What type of heat transfer is Oliver experiencing?
Answer:
conduction
Explanation:
The type of heat transfer is Oliver experiencing is Conduction.
What are different types of heat transfer?Heat transfer takes place in three modes,
1. Conduction
2. Convection
3. Radiation
1. Conduction :
Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide. In solids and liquids, where particles are more closely spaced, conduction happens more easily than in gases, where particles are more widely spaced.
2. Convection :
Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids, fluid motion is responsible for the bulk of the heat transfer.
3. Radiation :
The energy that emanates from a source and moves through space at the speed of light is referred to as radiation.
When Oliver arrives at the beach to meet his friend Farah, the sand feels hot and burns his bare feet as the heat is trapped in the sand and the heat is transferred to Oliver's feet by Conduction.
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In a chemistry laboratory, a student filled a 10.0 L container with two (2) different gases. The
gases are nitrogen gas taken from 24.0 L container at 2.00 atm and 12.0 L container of
oxygen at 2.00 atm. If the temperature of the gases is 273 K, calculate the partial pressure
of both gases in the resulting mixture and the total pressure.
Answer:
[tex]P_N=1.33atm\\\\P_O=0.67atm[/tex]
[tex]P_T=2.00 atm[/tex]
Explanation:
Hello.
In this case, the first step is to compute the moles of nitrogen and oxygen given their initial P, T and V conditions via the ideal gas equation:
[tex]n_{N}=\frac{P_{N}V_{N}}{RT} =\frac{2.00atm*24.0L}{0.082\frac{atm*L}{mol*K}*273K}\\ \\n_{N}=2.144molN\\\\n_{O}=\frac{P_{O}V_{O}}{RT} =\frac{2.00atm*12.0L}{0.082\frac{atm*L}{mol*K}*273K}\\ \\n_{O}=1.072molO[/tex]
After that, since the total volume now, once the mixture is formed is the addition between the initial volumes (12.0 L + 24.0 L) is 36.0 L, the partial pressure of each gas turns out:
[tex]P_N=\frac{2.144mol*0.082\frac{atm*L}{mol*K}*273K}{36.0L}\\\\P_N=1.33atm\\\\P_O=\frac{1.072mol*0.082\frac{atm*L}{mol*K}*273K}{36.0L}\\\\P_O=0.67atm[/tex]
Thus, the final total pressure is:
[tex]P_T= P_N+P_O=1.33atm+0.67atm\\\\P_T=2.00 atm[/tex]
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PLEASEEEEEEEEEEEEEEEEEEEE im slow i'll give you brainliest if you answer idkk what to do
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Compound:A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.
Element:Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
Mixture:is a material made up of two or more different substances which are physically combined.
Chemical Formula:A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. I
Pure substance:A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.
hope this help!
Answer:
Here are the definitions of all of them.
Explanation:
Molecule:
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Compound:
A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.
Element:
Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.
Mixture:
is a material made up of two or more different substances which are physically combined.
Chemical Formula:
A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. I
Pure substance:
A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.
A student trying to determine if a liquid was a mixture or a pure substance made several following observations. Which observation would best support the conclusion that the liquid was a mixture?
Answer:
Distillation
Explanation:
By using the method of distillation we'll identify if there is other properties of liquid by looking the temperatures,the ordor or the boiling point.
do it if u trust urself
Which statement provides the complete explanation of how renewable and nonrenewable resources differ?
They differ in the amount they are found in nature.
They differ in the rate they are replaced.
They differ in the available amount and rate they are used and replaced.
They differ in the rate they are used.
Answer:
They differ in the available amount and rate they are used and replaced.
Explanation:
If one material is replaceable, then it's renewable. If it's not replaceable, then it's non-renewable.
The statement 'they differ in the available amount and rate they are used/replaced' provides an explanation of how renewable and nonrenewable resources differ.
What are renewable resources?Renewable resources can be defined can natural resources that can be renowned in nature in a given period of time.
These renewable resources include biomass and different types of energies (geothermal, wind, solar, etc). Conversely, non-renewable resources are specific resources from nature that cannot be replaced (e.g., coal).In conclusion, the statement 'they differ in the available amount and rate they are used/replaced' provides an explanation of how renewable and nonrenewable resources differ.
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What is the independent variable?
Answer:
An independent variable is defines as the variable that is changed or controlled in a scientific experiment. It represents the cause or reason for an outcome. Independent variables are the variables that the experimenter changes to test their dependent variable.
Explanation:
:)
Heres some defs- a variable (often denoted by x ) whose variation does not depend on that of another. The independent variable is the variable the experimenter changes or controls and is assumed to have a direct effect on the dependent variable. ... The dependent variable is the variable being tested and measured in an experiment, and is 'dependent' on the independent variable.
what is the formula for sodium hydrogen phosphate
Answer: Na2HPO4
Explanation: this is the formula
Answer:
Na3PO4
Explanation:.
12. What is the frequency of a photon with an energy of 3.03 x 10-19 J?
(Planck's constant: h=6.63x 10-34 J·s) (E =hu)
a. 1.98x10^-18 Hz
b. 4.58x10^14 Hz
c. 2.16x10^14 Hz
d. 4.39x10^-19 Hz
Answer:
[tex]u=4.57x10^5GHz[/tex]
Explanation:
Hello.
In this case, given the formula:
[tex]E=h*u[/tex]
Whereas E is the energy, h the Planck's constant and u the frequency of the photon. Thus, solving for it, we obtain:
[tex]u=\frac{E}{h}=\frac{3.03x10^{-19}J}{6.63x10^{-34}J*s}\\ \\u=4.57x10^{14}s^{-1}[/tex]
Or also:
[tex]u=4.57x10^{14}Hz*\frac{1GHz}{1x10^9Hz}\\ \\u=4.57x10^5GHz[/tex]
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The abiotic factor is primary source of energy for all organisms.
Answer:
True, abiotic factors are the primary resources.
Answer: The abiotic factor sunlight is the primary source of energy for living organisms.
Explanation: edmentum/plato
Ammonium cyanate (NH4CNO) reacts to form urea (NH2CONH2). at 65 degrees celsius, the rate constant, K is 3.60 L mol^-1 s^-1. what is the rate law for this reaction
Answer:
v = 3.60Lmol⁻¹s⁻¹ [NH₄CNO]²
Explanation:
The reaction at 65°C of ammonium cyanate to produce urea is:
NH₄CNO → NH₂CONH₂
The general rate law is:
v = K [NH₄CNO]ˣ
Where v is rate of the reaction, K is rate constant and x represents the order of reaction
Based on the units of the rate constant (Lmol⁻¹s⁻¹ = M⁻¹s⁻¹) the reaction must be order 2 and the rate law:
v = K [NH₄CNO]²
v = 3.60Lmol⁻¹s⁻¹ [NH₄CNO]²
0
Chem
Equations
Balance and Classify each of the following equations into:
Combination reaction, Decomposition Reaction, Single
Replacement reaction, Combustion reaction Double
Replacement reaction
A)
KBr(aq) + Cl2(g) → _ KCl(aq) + Br2(1)
B)
CaBr2(aq)
+ H2SO4(aq) - CaSO4(s) +_HBr(g)
N2(g) + H2(g) + NH3(g)
Grading: Each Equation Balanced --2 points, Classification --
1 point each
Ontime submission ---1 point
DUE: Oct 9, 2020 at 11:00 AM
Answer :
(A) The balanced chemical reaction will be:
[tex]2KBr(aq)+Cl_2(g)\rightarrow 2KCl(aq)+Br_2(l)[/tex]
This reaction is a single replacement reaction.
(B) The balanced chemical reaction will be:
This reaction is a double displacement reaction.
(C) The balanced chemical reaction will be:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
This reaction is a combination reaction.
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of an element present on reactant side must be equal to the product side.
Part (A):
The balanced chemical reaction will be:
[tex]2KBr(aq)+Cl_2(g)\rightarrow 2KCl(aq)+Br_2(l)[/tex]
This reaction is a single replacement reaction in which the most reactive element displaces the least reactive element from its solution.
Part (B):
The balanced chemical reaction will be:
[tex]CaBr_2(aq) +H_2SO_4(aq)\rightarrow CaSO_4(s)+2HBr(g)[/tex]
This reaction is a double displacement reaction in which a positive cation and a negative anion of two reactants exchange their places to form two new products.
Part (C):
The balanced chemical reaction will be:
[tex]N_2(g)+3H_2(g)\rightarrow 2NH_3(g)[/tex]
This reaction is a combination reaction in which the two atoms combine to form a larger molecule.
the sun warming the surface of a rock is
conduction
convection
radiation
Test (Speed, Velocity and Acceleration)
A dog can run as fast as 15 miles per hour for a short distance. If a dog ran at this speed 0.10 of an hour, how far would it run?
Answer:
1.5 miles
Explanation:
Given that,
Speed of dog, v = 15 mph
Time taken by the dog, t = 0.1 h
We need to find the distance travelled by the dog. We know that, distance is the product of speed and time. So,
d=vt
[tex]d=15\times 0.1\\\\d=1.5\ \text{miles}[/tex]
Hence, the dog will cover a distance of 1.5 miles.
Complete and balance each of the following equations for acid-base reactions.
H3PO4(aq) + Sr(OH)2(aq) →
Explanation:
Sr(OH)2 + H3PO4 = Sr3(PO4)2 + H2O - Chemical Equation Balancer.
Answer:
3Sr(OH)2 + 2H3PO4 → Sr3(PO4)2 + 6H2O
Explanation:
please check the image for accurate answer
Suppose during volleyball practice, you drank 900 grams of water. If your body released 800 calories of energy into the water, what would be the temperature change of the water?
Answer:
75 degrees
Explanation:
Recall that you have about 5 L of blood in your body. Your kidneys filter your entire blood volume every 5 minutes which means you kidneys filter 2000 L of blood a day. How many times did your entire blood volume go through your kidneys?
If the heat of fusion for water is 334 j/g, how many Jules are needed to melt 45.0 g of ice at 0.0°c?
Given parameters:
Heat of fusion of water = 334j/g
Mass of ice = 45g
Temperature of ice = 0.0°c
Unknown:
Amount of heat needed to melt = ?
Solution:
This is simply a phase change and a latent heat is required in this process.
To solve this problem; use the mathematical expression below;
H = mL
where m is the mass
L is the heat of fusion of water;
H = 45 x 334 = 15030J
If I initially have a gas at a pressure of 10.0 atm, a volume of 24.0 liters, and a temperature
of 200. K, and then I raise the pressure to 14.0 atm and increase the temperature to 300. K,
what is the new volume of the gas?
Answer:
The new volume of gas is 25.7 L.
Explanation:
Given data:
Initial volume = 24.0 L
Initial pressure = 10.0 atm
Initial temperature = 200 K
Final temperature = 300 K
Final volume = ?
Final pressure = 14.0 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
P₁ = Initial pressure
V₁ = Initial volume
T₁ = Initial temperature
P₂ = Final pressure
V₂ = Final volume
T₂ = Final temperature
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 10.0 atm × 24.0 L × 300K / 200 K × 14.0 atm
V₂ = 72000 atm .L. K / 2800 K.atm
V₂ = 25.7 L
The new volume of gas is 25.7 L.
The greater the amount of mass an object has, the more force is needed to move it.
Answer: Newtons Second Law states that acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated), the greater the amount of force needed to accelerate the object (bullet in our case). Everyone inherently knows that heavier objects require more force to move the same distance as lighter objects.
Explanation:
How does a scientist make two solutions with the same molarity? A By dissolving the maximum amount of each substance in the B. By dissolving the same number of grams of each substance in the OC. By dissolving 1 mole of each substance in enough water to make same volume of water same volume of water sure dissolving is complete By dissolving the same number of nmoles of each substance in the same volume of water OD.
Answer: The answer is “ By dissolving the same number of nmoles of each substance in the same volume of water ”
Explanation:
By dissolving the same number of moles of each substance in the same volume of water. Hence, option D is correct.
Define the molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.
Adding water to a solution and the number of moles of the solvent stay the same while the volume increases.
If there is no flow of solute into or out of the volume during the addition of the solvent, the number of moles of solute remains the same.
Hence, option D is correct.
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A tree burns down and forms ashes
Physical or
Chemical
Answer:
It is a chemical change.
Explanation:
A tree burning down would be a chemical change because the composition of the tree is what changes, not just the physical characteristics.
Are strong acids more readily attracted to strong bases than to weak bases?
how many protons electrons and nuetrons does as have
A container of hydrogen at 172 kPa was decreased to 85.0 kPa producing a new volume of 3L. What was the original volume?
Answer:
The answer is 1.48 LExplanation:
In order to find the original volume we use the same for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the original volume
[tex]V_1 = \frac{P_2V_2}{P_1} \\[/tex]
From the question
P1 = 172 kPa = 172000 Pa
P2 = 85 kPa = 85000 Pa
V2 = 3 L
We have
[tex]V_1 = \frac{85000 \times 3}{172000} = \frac{255000}{172000} = \frac{255}{172} \\ = 1.482558139...[/tex]
We have the final answer as
1.48 LHope this helps you
Group the elements into pairs that would most likely exhibit similar chemical properties. It does not matter which pair of elements is pair 1, pair 2, or pair 3, so long as the correct elements are paired. elements are N, As, Br, Mg, Sr, F
The elements in a group containing similar physical properties are
Pair 1 -- K and Li
Pair 2 -- S and Te
Pair 3 -- Br and F
Those elements which belong to the same group in the periodic table have similar number of valence electrons in the last shell and such elements exhibit similar properties.Potassium(K) and Lithium(Li) belong to a similar group i.e group 1.Sulfur (S) and Tellurium (Te) belong to a similar group i.e. group 16.Bromine(Br) and Flourine (F) belong to a similar group i.e. group 17Elements in a group exhibit similar periodic properties be it physical or chemical.It is in accordance with the periodic rules.To learn more periodic properties visit:
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Materials with air pockets that decrease their density and prevent energy transfer are called:
A. Insulators
B. Thermometers
C. Conductors
D. Compressors
ILL IBE BRAINLY Asian Tsunami 2004:
2. In decomposition, how are other parts of the ecosystem affected?
3. Under which type of change would more organisms be able to survive? Why?
4. What are some positive effects of a rapid change to an ecosystem?
5. What are some positive effects of a slow change to an ecosystem?
The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is ________. The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide is ________. H+ (aq) + Na+ (aq) + OH- (aq) → H2O (l) + Na+ (aq) HNO3 (aq) + OH- (aq) → NO3- (aq) + H2O (l) H+ (aq) + HNO3 (aq) + 2OH- (aq) → 2H2O (l) + NO3- (aq) H+ (aq) + OH- (aq) → H2O (l) HNO3 (aq) + NaOH (aq) → NaNO3 (aq) + H2O (l)
Answer:
H+ (aq) + OH- (aq) → H2O (l)
Explanation:
The net ionic equation is the main reaction going on in the system. The reaction between nitric acid and sodium hydroxide is a neutralization reaction.
In a neutralization reaction, the main reaction is the combination of hydrogen ions and hydroxide ions to form water. This reaction has been shown in the answer box.
2. What is the pH of the following solutions?
2.1. 50 mmol.dm solution of Ba(OH)2