Answer:
it has 79 protons
Explanation:
the atomic number is equal to the number of protons an element has.
On the periodic table, gold has the atomic number 79. This means that the gold has a total of 79 protons present inside its nucleus, as the number of protons signifies the atomic number.
What is the atomic number?The total number of protons present in an atom is known as the atomic number of that atom.
The atomic number has no correlation either with the number of neutrons or the number of electrons present inside an atom
The current periodic table divides elements into groups according to their increasing atomic numbers.
The atomic number of gold is 79 on the periodic table. This indicates that the gold's nucleus has 79 protons in total, where the number of protons represents the atomic number.
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At standard temperature and pressure the molar volumes of CO2 and NH3 gases are 22.31 and 22.40 L, respectively. The density of crystalline CO2 at 160 K is 1.56 g/cm^3. Calculate the molar volumes.
Answer:
Molar volume of CO₂ at 160 K = 0.02820 L per mole
molar volume of NH₃ at 160 K = 0.02024 L per mole
Note: The question is incomplete. The complete question is given below:
At standard temperature and pressure the molar volumes of CO2 and NH3 gases are 22.31 and 22.40L respectively. The densities of crystalline CO2 and NH3 at 160K are 1.56 and 0.84 g/cm^3, respectively. Calculate their molar volumes
Explanation:
molar mass of CO2 = 44.0 g/mol
molar mass of NH3 = 17.0 g/mol
Density = mass/volume
Therefore, Volume = mass/density
Volume of CO2 = mass of CO2/ density of CO2
Volume of CO2 = 44.0 g/mol / 1.56 g/cm³ = 28.20 cm³ per mole
Converting to liters 28.20 * 1 L/1000 cm³ = 0.02820 L per mole
Therefore, molar volume of CO2 at 160 K = 0.02820 L per mole
Volume of NH3 = mass of NH3/ density of NH3
Volume of NH3 = 17.0 g/mol / 0.84 g/cm³ = 20.24cm³ per mole
Converting to Liters; 20.24 cm³ * 1 L/1000 cm³ = 0.02024 L per mole
Therefore, molar volume of NH3 at 160 K = 0.02024 L per mole
help plz now asap this is timed
In a Lewis structure, what do you do with the total number of valence if your ion is
2- charged?
a) Divide the valence number by 2
b) Multiply the valence number by 2
c) Subtract 2 from the valence number
d) Add 2 to the valence number
Answer: add 2 valence electrons
Explanation:
You have to make up for the negative electrons so you add them
When the ion is -2 charged we add 2 electrons to the total number of valence electrons.
Explanation:
Lewis structure is a simplified representation of the bonding of atoms in a molecule.It also represents the number of valence electrons and their distribution in the molecule.This electronic configuration should be of order by which all the octets of atoms in a molecule are complete.In order to draw a lewis structure of a molecule or ion count the valence electrons of all atoms in the ion or molecule.Draw skeletal structure of molecule or ion.Now add valence electrons to the structure with the help of dotsFor ions, if the charge on the ion is negative then add the number of electrons equal to the magnitude of negative charge to the total valence electrons.For ions, if the charge on the ion is positive then subtract the number of electrons equal to the magnitude of positive charge from the total valence electrons.So from this, we can conclude that when the ion is -2 charged we add 2 electrons to the total number of valence electrons.
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which phase describes the mass of an ice cube
Answer:
Total amount of water in the ice cube
Explanation:
The mass of an ice cube is the total amount of water in the ice cube. Ice is the solid form of water. Hope this answers the question. Have a nice day. Feel free to ask more questions.
How many molecules of NH3 are in 45 mol of NH3 ?
Answer:
Explanation:
5
How many atoms does h20 have and how many elements does h20 have?
Answer:
h20 has 3 atoms
Explanation:
2 hydrogen atoms and 1 oxygen atom
a. What is a period on the periodic table?
Answer:
In chemical bonding: Arrangement of the elements. The horizontal rows of the periodic table are called periods. Each period corresponds to the successive occupation of the orbitals in a valence shell of the atom, with the long periods corresponding to the occupation of the orbitals of a d subshell.
Explanation:
Calculate the mass, in grams, of Ag2CrO4 that will precipitate when 50.0mL of 0.20M AgNO3 solution is mixed with 40.0mL of 0.10M K2CrO4 solution. Assume that Ag2CrO4 is completely insoluble (its Ksp is ~ 0).
Answer:
1.327 g Ag₂CrO₄
Explanation:
The reaction that takes place is:
2AgNO₃(aq) + K₂CrO₄(aq) → Ag₂CrO₄(s) + 2KNO₃(aq)First we need to identify the limiting reactant:
We have:
0.20 M * 50.0 mL = 10 mmol of AgNO₃0.10 M * 40.0 mL = 4 mmol of K₂CrO₄If 4 mmol of K₂CrO₄ were to react completely, it would require (4*2) 8 mmol of AgNO₃. There's more than 8 mmol of AgNO₃ so AgNO₃ is the excess reactant. That makes K₂CrO₄ the limiting reactant.
Now we calculate the mass of Ag₂CrO₄ formed, using the limiting reactant:
4 mmol K₂CrO₄ * [tex]\frac{1mmolAg_2CrO_4}{1mmolK_2CrO_4} *\frac{331.73mg}{1mmolAg_2CrO_4}[/tex] = 1326.92 mg Ag₂CrO₄1326.92 mg / 1000 = 1.327 g Ag₂CrO₄Sugar solution and steel are both mixtures. Which statement correctly compares them?
A) Both sugar solution and steel are separable mixtures.
B) Both sugar solution and steel are inseparable mixtures.
C) Sugar solution is a separable mixture but steel is an inseparable mixture.
D) Sugar solution is an inseparable mixture but steel is a separable mixture.
Answer:
C) Sugar solution is a separable mixture but steel is an inseparable mixture.
Explanation:
Sugar can be put in water then have the water dried out and there will be sugar. Metal how ever can not be a separable mixture without making it into a liquid.
There is a golden role of solubility, polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, the correct option is option C.
What is solution?Solutions are a homogeneous mixture of two or more substances. A solution is a homogeneous mixture of solvent and solute molecules.
Solvent is a substance that is in large amount in solution. solute is the substance which is in small amount in a solution. Sugar solution is a separable mixture but steel is an inseparable mixture. Sugar can be separated by heating the solution . Water will evaporate and sugar will be left. Steel can not be separated by any means.
Therefore, the correct option is option C that is Sugar solution is a separable mixture but steel is an inseparable mixture.
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Physical Properties
Directions: Read each statement below. If the statement is true, write T. If the statement is false, write F. Then rewrite the statement, with corrections, on the lines provided.
Mass is the weight of an object. ___________________________________________________________________
______________________________________________________________________________________________________
Solubility and melting point are two examples of physical properties. _________________________
______________________________________________________________________________________________________
Atoms that make up a compound are bonded together; they cannot be separated by physical means. _____________________________________________________________________________
________________________________________________________________________________________________
The density of an object can be calculated by dividing the object’s length by its width.
_____________________________________________________________________________________________________________________________
___________________________________________________________________________________________________________________________
A physical property is a characteristic of matter that you cannot observe or measure without changing the identity of the matter.
________________________________________________________________________________________________________________________________________________________________________________________________________________
Every element and compound has a unique set of properties.
___________________________________________________
Statement 1: False
Mass is defined as the quantity of matter.Statement 2: True
Statement 3: True
Statement 4: False
Density = mass/volumeStatement 5: False
An example of a physical property is color, which can be determined by observation.Statement 6: True
What is the main difference between a proton and a neutron?
Select one:
a. Size is the main difference
b. Charge is the main difference
c. Location in the atom in the main difference
d. Radioactivity is the main difference
Answer:
b. Charge is the main difference
Explanation:
This is a theory question which you just need to understand and remember the concepts.
Protons and neutrons are relatively the same sizes.
The charges here are defined, protons are positively charged and neutrons have no charge (electrically neutral).
Both are located in the nucleus of an atom.
Proton radiation rarely occurs and neutron radiation is a form of ionizing radiation in cases typically of nuclear fission or nuclear fusion.
The most likely answer is that the charge is the main difference. This is also a basic concept so this would be the answer.
What happens when matter changes its form?
Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. For a solid to change to a liquid, matter must absorb energy from its surroundings
PES uses which type of electromagnetic radiation?
A. Ultraviolet and X-rays
B. Infrared
C. Ultraviolet and visible
D. Radio
Answer:
the answer should be A if im correct
Explanation:
Answer the 3 thanks!
what is the amount of heat energy released when 50.0 grams of water is cooled from 20.0 degrees Celcius
Answer:
q = mC∆T
q = (50 g)(4.184 J/g/deg)(10 deg)
q = 2092 J = 2.09x10^3 J
That's how it's done.
Explanation:
Hope this helps! sorry If i didn't simplify enough..
What are some different things that can cause weathering?
Answer:
not recycling can make a hole in the ozone layer
Explanation:
Frost Weathering. Frost weathering occurs in the presence of water, particularly in areas where the temperature is near...Thermal Stress. Thermal stress occurs when heat absorbed from the surrounding air causes a rock to expand.Recycling keeps the ozone layer safe but if we stop recycling then we could burn a hole in the ozone layer and it could get even more hotter outside we might start sweating more often
Hope this helps ♡
Silver is an element that can conduct electricity and heat and is shiny. Silver is most
likely
Answer:
a metal
Explanation:
metals are good conductors of electricity
Silver shows electrical and thermal conductivity and shows luster. These properties are feature of a metal and thus silver is most likely a metal.
What is silver?Silver is 69th element in the periodic table and is included in the transition metals. It is a d-block element with the symbol Ag came from the Latin name argentum.
Silver is a common component in electronic devices since it is the most conducting metal . Thermal conductivity and shining property are other features of silver. Due to its shining silver is used to make ornaments.
The highly conducting and shining materials are termed as metals therefore, silver is a metal.
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Which one of these could be in the unknown anion "X" in this acid: H3X
carbonate
fluorate
nitrogen
nitrite
Could you explain how to find this? The process?
Answer:
the answer is nitrogen
Predict the products of this reaction: H2 + Cl2 →
Answer:
2HCl is the product of this reaction 2 is added in order to balance the reaction
What is the main function of the part labeled Y in the model?
A To hold and protect the cell's DNA
B. To store enzymes that break down food
C. To store food and other materials inside a cell
D. To use energy from sunlight to make sugars
Answer
D
Explanation
the answer is D
Answer:
The answer is D.To use energy from sunlight to make sugars
Explanation:
Hope this helps <3
If 8.50 L of natural gas, which is essentially methane (CH4), undergoes complete combustion at 730 mm Hg and 20 degrees C, how many grams of each product are formed?
Grams of CO2=______
Grams of H2O=______
mass CO₂ : 14.96 g
mass H₂O : 12.24 g
Further explanationReaction
CH₄+2O₂⇒CO₂+2H₂O
mol CH₄V=8.5 L
P=730 mmHg=0,961 atm
T=20+273=293 K
[tex]\tt n=\dfrac{PV}{RT}=\dfrac{0.961\times 8.5}{0.082\times 293}=0.34[/tex]
mass CO₂(MW=44 g/mol)mol CO₂= mol CH₄ = 0.34
[tex]\tt 0.34\times 44=14.96~g[/tex]
mass H₂O (MW=18 g/mol)mol H₂O= 2 x mol CH₄ = 2 x 0.34 = 0.68
[tex]\tt 0.68\times 18=12.24~g[/tex]
Mosses and liverworts are examples of ___________.
A)seedless non-vascular plants
B)seedless vascular plants
C)vascular plants
D)gymnosperms
Answer:
A
Explanation:
...
5Fe2 2Mn2 8H2O2MnO4- 5Fe 16H In the above reaction, the oxidation state of iron changes from to . How many electrons are transferred in the reaction?
Answer:
The oxidation number of iron changes from 2+ to 0.
10 electrons are transferred in the reaction.
Explanation:
Step 1: Write the balanced redox reaction
5 Fe²⁺ + 2 Mn²⁺ + 8 H₂O ⇒ 2 MnO₄⁻ + 5 Fe + 16 H⁺
Step 2: identify both half-reactions
Reduction: 5 Fe²⁺ + 10 e⁻ ⇒ 5 Fe
Oxidation: 2 Mn²⁺ + 8 H₂O ⇒ 2 MnO₄⁻ + 16 H⁺ + 10 e⁻
Step 3: Identify the oxidation state change of iron
Iron changes from Fe²⁺ to Fe, that is, the oxidation number changes from 2+ to 0.
Step 4: Determine how many electrons are transferred in the reaction?
According to both balanced half-reactions, 10 electrons are transferred in the reaction.
Approximately what mass of CuSO4*5H20 (250 g mol^-1) is required to prepare 250 mL of 0.10 M copper(ll)
sulfate solution?
A) 4.0 g
B
6.2 g
С
34 g
D
85 g
E
140 g
Mass of CuSO₄.5H₂0 = 6.25 g (B)
Further explanationMW CuSO₄.5H₂0 =250 g/ mol
mol of CuSO₄
[tex]\tt 0.25\times 0.1=0.025[/tex]
mass of CuSO₄ (MW=159.61 g/mol)
[tex]\tt 0.025\times 159.61=3.99~g[/tex]
[tex]\tt mass~CuSO_4=\dfrac{159.61}{250}\times mass~CuSO_4.5H_2O\\\\mass~CuSO_4.5H_2O=\dfrac{3.99\times 250}{159.61}=6.25~g[/tex]
Pls help with this
Answer:
ok so u take 90-20 for the is where the miniscus is at and u get 70 then count the number of spaces between 70 and 80 and then take that and subtract 70 and 20 to get 50 and i think thats ur answer.
I HOPE THIS IS HELPFUL!!!
If 11.9 kJ are used to heat a sample of water the temperature increases from 20.0°C to
650°C. Calculate the mass of the water
general formula
Answer:
[tex]m=4.51g[/tex]
Explanation:
Hello!
In this case, since the energy involved during a heating process is shown below:
[tex]Q=mCp\Delta T[/tex]
Whereas the specific heat of water is 4.184 J/(g°C), we can compute the heated mass of water by the addition of 11.9 kJ (11900 J) of heat as shown below:
[tex]m=\frac{Q}{Cp\Delta T}[/tex]
Thus, by plugging in, we obtain:
[tex]m=\frac{11900J}{4.184\frac{J}{g\°C}(650\°C-20.0\°C)}\\\\m=4.51g[/tex]
Best regards!
Please help me people it’s due today at 6:00pm please help me please please
Explanation:
gravity if it's incorrect sorry
Answer:
ya it's true
Explanation:
its gravity it is true it's right
I would like some help with this asap
Answer:
sorry i coudnt help
Explanation:
C is the midpoint of BD
Answer:
1. Definition of Midpoint
2.Angle BCA is congruent to angle DCA
⚠️Which type of energy warms earths surface⚠️ ASAP needed 10points
Solar energy is the type of energy that warms earth surface. Details about solar energy can be found below.
What is solar energy?Solar energy is the energy in the form of electromagnetic radiation emitted from the Sun.
Solar energy is especially that part of electromagnetic energy that is converted into usable thermal or electrical energy by man.
This energy from the sun warms the Earth surface and provides the heat needed for various activities.
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