Answer:
Mass number or relative atomic mass number.
3
Atomic
Atomic
Atomic
ons, an...
Protons
Neutrons Electrons
symbol
number
mass
TABLE...
lack to ...
B
6
11
24
31
37
39
89
Answer:
CCCCCCCCCCCCCCCCCCCC THATS THE ANSWER
Explanation:
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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2. What is the pH of the following solutions?
2.1. 50 mmol.dm solution of Ba(OH)2
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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The reaction between methanol and oxygen gas produces water vapor and carbon dioxide. 2CH3OH(l)+3O2(g)⟶4H2O(g)+2CO2(g) Three sealed flasks contain different amounts of methanol and oxygen. Based on the molecular view of the three flasks, which would produce the largest quantity of total product? The flask contains 3 molecules of C H 3 O H and 3 molecules of O 2. The flask contains 1 molecule of C H 3 O H and 6 molecules of O 2. The flask contains 4 molecules of C H 3 O H and 2 molecule of O 2. For the flask which produces the largest quantity of total product, how many molecules of H2O will be formed? molecules of H2O :
Answer:
The flask that produces the largest quantity of product is the second flask
The molecules of H 2 O formed is [tex]X = 8 \ molecules [/tex]
Explanation:
From the question we are told that
The reaction is
2CH3OH(l) + 3O2(g)⟶4H2O(g)+2CO2(g)
The first flask contains 3 molecules of C H 3 O H and 3 molecules of O 2
The second flask contains 1 molecule of C H 3 O H and 6 molecules of O 2
The third flask contains 4 molecules of C H 3 O H and 2 molecule of O 2.
Looking at the three flasks we can see that base on molecular view the flask which produces the largest quantity of total product is second flask
From the balanced equation we see that 2 moles of C H 3 O H are required to react with 3 moles of oxygen hence O 2 is the limiting reactant
Generally 1 mole of any substance is [tex]1 * N_A[/tex] of that substance
Here [tex]N_A[/tex] is the Avogadro number with the value [tex]N_A = 6.02214076 * 10^{23} \ molecules[/tex]
So
Looking at the balanced equation we see that 3 moles of O 2 (3 * [tex]N_A[/tex] molecules of O 2 ) produces 4 moles of H2O(4 *
Then 6 molecules of O 2 will produce X molecules of H 2 O
So
[tex]X = \frac{6 * (4 * N_A }{3 * N_A}[/tex]
=> [tex]X = 8 \ molecules [/tex]
А group of students are investigating what happens when you put different
temperatures of water together. In this investigation, they have set up a vial
of colorless room-temperature water and are adding purple hot water at the
bottom of the vial, using a pipette
What do you predict happens in the first 5 seconds.
Answer:
B. The hot water mixes all through the vial
Explanation:
The hot water is able to mix all through the vial because when water is heated, it's molecule are loosed. They are able to speed up and spread, occupying a larger volume. Hot water is less dense than room-temperature water and the hot water can float on room-temperature water.
The bitter-tasting compound quinine is a component of tonic water and is used as a protection against malaria. It contains only C, H, N and O. When a sample of mass 0.487 g was burned, 1.321 g of carbon dioxide, 0.325 g of water, and 0.0421 g of nitrogen were produced. The molar mass of quinine is 324 g/mol. Determine the empirical and molecular formulas of quinine. (Type your answer using the format CO2 for CO2 and use the order CHNO)
empirical
........
molecular
..........
Answer:
Empirical formula = [tex]\mathbf{C_{10}H_{12}N_{2}}[/tex]
Molecular formula = [tex]\mathbf{C_{20}H_{24}N_{4}}[/tex]
Explanation:
From the given information:
we need to estimate the mass of carbon C in 1.321 g of [tex]CO_2[/tex]
before that, the number of moles of C is:
[tex]C = 1.321 \ g \times \dfrac{1 \ mol \ CO_2}{44/010 \ g \ of \ CO_2}[/tex]
c = 0.03002 mol
we know that:
number of moles = mass/ molar mass
mass = number of moles × molar mass
mass = 0.03002 × 12.011g of C
mass of C = 0.3606 g
Similarly; for hydrogen
the number of moles of H = [tex]0.325 g \ of \ H_2O \times \dfrac{ 1\ mol \ H_2O}{18.02g \ of \ H_2O}\times \dfrac{2 \ mole \ of H }{1 \ mol \ H_2O }[/tex]
the number of moles of H = [tex]0.325 g \ of \ H_2O \times \dfrac{2 \ mole \ of H}{18.02g \ of \ H_2O}[/tex]
the number of moles of H = 0.0361 mol of H
mass of H = [tex]0.0361 \ mol \ of \ H \times \dfrac{1.008 g \ of \ H}{ 1 \ mol \ of \ H}[/tex]
mass of H = 0.0364 g
The mass of N will therefore be the difference the sample burnt with the mass of carbon and hydrogen.
i.e
mass of N = 0.487 g - 0.3606 of C - 0.0364 g of H
mass of N = 0.0900 g
however, the number of moles of nitrogen = mass/ molar mass
the number of moles = 0.0900 g /14.007 g
the number of moles of nitrogen = 0.00643 mol
Thus, the formula is: [tex]\mathsf{C_{0.03002}H_{0.0361}N_{0.00643}}[/tex]
If we divide by the smallest number (0.00643); we have:
[tex]\mathsf{C_{\dfrac{0.03002}{0.006432}}H_{\dfrac{0.0361}{0.00643}}N_{\dfrac{0.00643}{0.00643}}}[/tex]
= [tex]\mathsf{C_{4.7}H_{5.7}N}[/tex]
Thus, multiplying the subscript by 2.1, we have:
[tex]\mathsf{C_{4.7 \times 2.1}H_{5.7 \times 2.1}N_{1\times 2.1}}[/tex]
Thus, the empirical formula = [tex]\mathbf{C_{10}H_{12}N_{2}}[/tex]
The mass of the empirical formula is:
= (10 × 12.010 u) + (12 × 1.008 u) + ( 2 × 14.007 u)
= 160.21 u
Thus, because the molecular mass 324 g/mol is double the value of the empirical formula, the molecular mass is definitely double the empirical formula;
i.e
Molecular formula = [tex]\mathbf{C_{10\times 2}H_{12\times 2}N_{2\times 2}}[/tex]
Molecular formula = [tex]\mathbf{C_{20}H_{24}N_{4}}[/tex]
Identify each term as a description of an electron geometry or a molecular geometry. Trigonal pyramidal for N F 3 Choose... Tetrahedral for N F 3 Choose... Arrangement of bonding and non-bonding electron domains Choose... Arrangement of only the atoms in a molecule Choose...
Answer:
electron geometry
Tetrahedral for N F 3
Arrangement of bonding and non-bonding electron domains
molecular geometry
Trigonal pyramidal for N F 3
Arrangement of only the atoms in a molecule
Explanation:
According to valence shell electron pair repulsion theory, the shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.
The electron pair geometry refers to the arrangement of bonding and non-bonding electron domains. For NF3, the electron geometry is tetrahedral.
The molecular geometry refers to the arrangement of only the atoms in a molecule. For NF3, the molecular geometry is trigonal pyramidal.
NF₃ has different geometry as per the arrangements of electrons. Tetrahedral and Trigonal bipryamidal are the two geometries.
According to valence shell electron pair repulsion theory:The shape of a molecule is determined by the number of electron pairs on the valence shell of the central atom in the molecule.
Electron geometry
Tetrahedral for NF₃
Arrangement of bonding and non-bonding electron domains
Molecular geometry
Trigonal pyramidal for NF₃
Arrangement of only the atoms in a molecule
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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.
marshmallow is costly, what type of food is marshmallow?
a.suspension b.solution c.colloid
Answer:
b solution
Explanation:
Harry and Ron are arguing over which broom has better acceleration, the Nimbus 2000 or the Firebolt. The boys are going to race the two brooms from the ground to the top of the goals. Then they will switch brooms and replicate their trials.
Test (independent) Variable: _____________________________________________________________
Result (dependent) Variable: _____________________________________________________________
Control Variables: _____________________________________________________________________
Define Replicate: _____________________________________________________________________
Answer:
Independent variable: BROOM
Dependent variable: ACCELERATION
Control variable: same distance
Find the definition of replicate below
Explanation:
In an experiment, the independent variable is the variable that is changed or manipulated by the experimenter. In this case, the independent variable is the BROOM.
The dependent variable is the variable that is measured in an experiment. It is the variable that responds to the independent variable. The ACCELERATION is the dependent variable in this case.
The control variable is the variable that is kept constant or unchanged throughout the experiment. In this case, the control variable is the SAME DISTANCE traveled for each broom.
A replicate is a repeated experiment with the expectance of a similar or consistent result. In this case, if the brooms are switched, the acceleration of each broom should be the same in the replicate result.
How many electrons are in the highest occupied energy level, n, of an element in Group 15?
Answer:
5 Electrons.
Explanation:
Hello.
In this case, an element in group 15 such as nitrogen has 5 electrons on the outer shell because of its electron configuration. For N, whose atomic number is 7, the electron configuration is:
[tex]N^7: 1s^2,2s^2,2p^3[/tex]
Whereas energy level 2 has 5 electrons (2 from 2s and 3 from 2p). Next element is phosphorous and its electrons configuration is:
[tex]P^{15}:1s^2,2s^2,2p^6,3s^2,3p^3[/tex]
It also has 5 electron on the energy level 3 (2 from 3d and 3 from 3p).
Best regards!
Complete the passage. K (potassium) belongs to group IA of the periodic table, and has 1 valence electron. Br (bromine) belongs to VIIA, and has valence electrons. answer= 7
Answer:
See detailed explanation.
Explanation:
Hello.
In this case, since the electron configuration of potassium whose atomic number is 19 turns out:
[tex]K^{19}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^1[/tex]
We can see that the last level is 4 which has one electron, meaning that potassium has one valence electron. Moreover, since bromine's atomic number is 35, its electron configuration is:
[tex]Br^{35}: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^5[/tex]
We can see that the last level is also 4 and it has 2+5 = 7 valence electrons. In such a way, we infer that the valence electrons are computed by the electrons at the outer or last energy level of an element.
Regards.
Answer:
7
Explanation:
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:
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.
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.
the sun warming the surface of a rock is
conduction
convection
radiation
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
Identify the results of a substance losing enegry
Calculate the number of atoms in a 3.68×103 g sample of aluminum.
Answer:
84.23×10^23
Explanation:
no.of atoms =given wt / gram Mw×avagdro num
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 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.
how many protons electrons and nuetrons does zn have
what would happen to global temperatures of solar energy was unbalanced
Answer:
mostly skin diseases
Explanation:
because of greenhouse effects
Which statement best explains why gases are poor conductors of thermal energy?
Answer:
Thermal Insulators
That's because air, like other gases, is a poor conductor of thermal energy. The particles of gases are relatively far apart, so they don't bump into each other or into other things as often as the more closely spaced particles of liquids or solids
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]
Best regards.
Materials with air pockets that decrease their density and prevent energy transfer are called:
A. Insulators
B. Thermometers
C. Conductors
D. Compressors
which of the following substance is an element?
A. Air
B. Iron
C. Salt
D. Sugar
Answer:
B. Iron
Explanation:
It is element number 26 on the periodic table.
Answer:
Iron is an element because it is a pure substance, air is a mixture, salt and sugar are compounds.
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.
The world map below shows the locations of San Francisco and Dublin which of these statements best explains why Dublin is not cooler than San Francisco although it is over 1600 km further north?
Answer:
Dublin is warmed by ocean currents.
Explanation:
Got it right on test
Answer:
B. Dublin is warmed by ocean currents.
Explanation: