Answer:
0.8084g/cm³
Explanation:
Density of a substance is calculated as follows:
Density = mass/volume
According to this question, the volume of a ball was measured at 500.0 cm³ and its mass was measured to be 404.2g. The density is this:
Density (P) = 404.2/500
Density = 0.8084
Density of the ball = 0.8084g/cm³
Answer:
0.8084
Explanation:
404.2 / 500.0
Molar mass is the total combined mass of a of a substance.
Answer:
molar mass
Explanation:
Which of these statements are true? Select all that apply. The Delta.Hf for Br2(I) is 0 kJ/mol. The Delta.Hf for He(I) is 0 kJ/mol. The Delta.Hf for Hg(I) is 0 kJ/mol. The Delta.Hf for Cl2(g) is 0 kJ/mol. The Delta.Hf for N2(I) is 0 kJ/mol. CORRECT ANSWER IS A, C, AND D.
Answer: The correct options are A, C and D.
Explanation:
Enthalpy of formation is defined as the change in the enthalpy when 1 mole of a chemical substance is formed from its pure element at standard conditions. It is represented by the symbol [tex]\Delta H_{f}[/tex]
Enthalpy of formation for elemental atoms is always equal to 0.
We know:
Bromine (Br) exists in a liquid state.
Helium (He) exists in a gaseous state.
Mercury (Hg) exists in a liquid state.
Chlorine (Cl) exists in a gaseous state.
Nitrogen (N) exists in a gaseous state.
For the given options:
The [tex]\Delta H_{f}[/tex] for [tex]Br_2(l), Hg(l)\text{ and }Cl_2(g)[/tex] will be equal to 0 because they are formed by the natural states of their elemental atoms.
Hence, the correct options are A, C and D.
A substance in its standard state has an enthalpy of formation of 0 kJ/mol.
The enthalpy of formation of a substance in its standard state is 0 kJ/mol.
The standard state of a substance refers to its state at 1 atm and at a temperature of 298 K. Bearing this in mind, we can now identify the true and false statements.
So,
ΔHf for Br2(I) is 0 kJ/mol - True
ΔHf for He(I) is 0 kJ/mol - False
ΔHf for Hg(I) is 0 kJ/mol - True
ΔHf for Cl2(g) is 0 kJ/mol - True
ΔHf for N2(I) is 0 kJ/mol - False
Learn more: https://brainly.com/question/9743981
1) list at least four uses of metals from your day to day life.
Answer:
alloy,copper,gold, silver,cobalt
Explanation:
30 points please no links!) A sea star has one of its arms break off. That arm grows into its own separate organism through __________. a. sexual reproduction c. spindle fibers b. regeneration d. chromosomes Please select the best answer from the choices provided A B C D
Answer:
B) Regeneration
the action or process of regenerating or being regenerated, in particular the formation of new animal or plant tissue.
PLEASE MARK THIS AS BRAINLIEST!
A sea star has one of its arms break off. That arm grows into its own separate organism through [tex]\sf\purple{regeneration}[/tex].
b. regeneration ✅
[tex]\large\mathfrak{{\pmb{\underline{\orange{Mystique35 }}{\orange{♡}}}}}[/tex]
Two comets are 300 m apart. One
comet has a mass of 80,000 kg. The
force between them is
1.48 x 10-6 N. What is the mass of the
other comet?
A) 25,000 kg
B) 250 kg
C) 3700 kg
D) 500 kg
Answer:
a
Explanation:
The strength of the gravitational attraction depends on the mass of the objects involved and the distance between them. The gravitational force between two objects will be lowest in which of the following situations?
A. Both objects have small masses and are close together.
B. One object has a large mass, and the objects are close together.
C. Both objects have large masses and are close together.
D. Both objects have small masses and are far apart.
Answer:
d sguro
Explanation:
I'm not sure kung ayan ba
If a shell can hold a maximum of 32 electrons, what is the value of n?
Answer:
The value of N would be 4.
Explanation:
The equation would be 2n^x = 32 and therefore, 4.
Answer in 6 min plz ..............
Answer: The chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
Explanation:
An ionic compound is formed when the complete transfer of electrons takes place from one element (usually metals) to another element (usually non-metals).
The element losing electron (metal) forms a positive ion known as a cation while the element gaining electron (non-metal) forms a negative ion known as an anion.
Element X has the atomic number 11 which is sodium. The electronic configuration of it is [tex]1s^22s^22p^63s^1[/tex]
This element will lose 1 electron to form [tex]X^+[/tex] ion of [tex]Na^+[/tex]
Chlorine has the atomic number 17. The electronic configuration of it is [tex]1s^22s^22p^63s^23p^5[/tex]
This element will gain 1 electron to form [tex]Cl^-[/tex] ion
When these two ions combine, they lead to the formation of an ionic compound having a chemical formula of [tex]XCl[/tex] or [tex]NaCl[/tex]
Hence, the chemical symbol of the compound formed is [tex]XCl[/tex] or [tex]NaCl[/tex]
What is a balanced nuclear equation for the alpha decay of Strontium-90?
Answer: The balanced nuclear equation for the alpha decay of Sr-90 is [tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\alpha[/tex]
Explanation:
A nuclear reaction is defined as the reaction in which the changes in the nucleus of an atom take place and usually form a different element. The types of decay processes are:
Alpha decayBeta-decayGamma decayAlpha decay is the process in which a heavy nucleus decays into a light nucleus with the release of an alpha particle. This alpha particle carries a charge of +2 units and has a mass of 4 units. It is also known as the helium nucleus. The general equation for this decay process is:
[tex]X_Z^A\rightarrow Y_{Z-2}^{A-4}+\alpha _2^4[/tex]
The nuclear equation for the alpha decay of strontium-90 isotope follows:
[tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\alpha[/tex]
Which represents a balanced nuclear equation?
Answer: second answer
Explanation:
The thing is that every new nuclear cycle a new element forms and reduces an electron. I may be wrong but this is the most logical and scientifically correct answer
Answer:
B
Explanation:
What is the difference between a concentrated solution of sulphuric acid and dilute solution of sulphuric acid
copper +sulfur + oxygen =
Which equation represents the correct net ionic equation for the reaction between Ca(OH)2 and H2SO4?
Upper H superscript plus, plus upper O upper H superscript minus right arrow upper H subscript 2 upper O.
2 upper H superscript plus, plus 2 upper O upper H superscript minus right arrow upper H subscript 2 upper O.
Upper C a superscript 2 plus, plus 2 upper O upper H superscript minus, plus upper S upper O subscript 4 superscript 2 minus right arrow upper C a superscript 2 plus, plus upper S upper O subscript 4 superscript 2 minus, plus 2 upper H subscript 2 upper O.
Upper C a (upper O upper H) subscript 2 plus upper H subscript 2 upper S upper O subscript 4 right arrow upper C a upper S upper O subscript 4 plus 2 upper H subscript 2 upper O.
Answer: The correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]
Explanation:
Net ionic equation is defined as the equations in which spectator ions are not included.
Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.
The balanced molecular equation is:
[tex]Ca(OH)_2(aq)+H_2SO_4(aq)\rightarrow CaSO_4(aq)+2H_2O(l)[/tex]
The complete ionic equation follows:
[tex]Ca^{2+}(aq)+2OH^-(aq)+2H^+(aq)+SO_4^{2-}(aq)\rightarrow 2Ca^{2+}(aq)+SO_4^{2-}(aq)+H_2O(l)[/tex]
As calcium and sulfate ions are present on both sides of the reaction. Thus, they are considered spectator ions.
The net ionic equation follows:
[tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]
Hence, the correct net ionic equation for the reaction is [tex]2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)[/tex]
Answer:
B. no reaction
Explanation:
Which substance cannot be broken down by chemical means? (1)aluminum(2)ammonia(3)aluminum oxide(4)ammonium chloride
Answer:
(2) Ammonia I hope you good luck
(1) aluminum
A substance that cannot be broken down into chemically simpler components is an element. A substance that can be broken down into chemically simpler components (because it has more than one element) is a compound.Let's look at all the options first:
Ammonium chloride appears to sublime upon heating but actually decomposes into ammonia and hydrogen chloride gas.Aluminum oxide is a compound. As it breaks down, it enables the pure aluminum underneath it to react as well.Aluminum, which is used in soda cans, is an element thus it cannot be broken down by chemical means.Ammonia is a compound it can be broken down down into simpler components.Learn more:
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What is the dewpoint if the dry bulb tempature is 18C and the relative humidity is 64% 1.14C 2.11C 3.9C 4.4c
Answer:
I think 11.1 degrees Celsuis
Explanation:
Let me know if i'm right coz im not too sure.
Question Number 6 of 10 - 8th Grade Science
A group of people were concerned about a new coal-burning power plant that might be built in their
neighborhood. What is probably their main concern?
The heat from burning coal can drive
generators that produce electricity
There is more coal in the earth than
there is oil and gas,
Burning coal produces sulfur dioxide
which contributes to acid rain.
Burning coal produces more heat
than burning wood
Answer:
Most likely burning coal produces silver dioxide with can cause acid rain
Explanation:
Only one answer comes with a negative consequence. All the others are either
1. Explaining the benefits of coal, such as it producing more heat
2. Stating that there is more coal than any other natural resource
3. Coal being more convenient
A list of changes is shown. Temperature decreases Intermolecular bonds become weaker Melting Intermolecular bonds become stronger Temperature remains constant Temperature increases Vibration of molecules slows down Molecules vibrate faster Which of the above changes would be accompanied by an increase of the kinetic energy of particles in a solid? (4 points)
Answer:
Intermolecular bonds become weaker
Melting
Temperature increases
Molecules vibrate faster
Explanation:
In the solid phase, intermolecular forces are found to be strongest. However, as the temperature is increased, the molecules of the solid begin to vibrate faster and intermolecular forces between them begin to weaken.
As intermolecular forces of a substance become weaker, the substance melts. The molecules in the liquid state possesses greater kinetic energy than the molecules in the solid state.
Hence the the answer above.
Answer:
B, C, F, and H
Explanation:
These are all things that happen in the increase of the kinetic energy of particles in a solid.
B. Intermolecular bonds become weaker
C. Melting
F. Temperature increases
H. Molecules vibrate faster
Also, just took the test and got it right.
draw the structure of the following atoms
(1) 19/9 F
(2)28/14 SI
Answer:
might help
Explanation:
How many moles are equal to 3.0x10^23 atoms of germanium? PLS ANSWER WITH WORK!
Help me and thanks YESSIR :) 10 points :)
Answer:
pen??????l think l m not sure
B The allusions recall specific locations and horrors of the Vietnam conflict.How many moles of H2O are produced when 12 moles of NH3 reacts with excess O2?
4 NH3 + 5 O2 → 4 NO + 6 H2O
Group of answer choices
18 moles H2O
12 moles H2O
6 moles H2O
9 moles H2O
Answer: 18 moles of [tex]H_2O[/tex] will be produced.
Explanation:
We are given:
Moles of ammonia = 12 moles
The given chemical equation follows:
[tex]4NH_3+5O_2\rightarrow 4NO+6H_2O[/tex]
By the stoichiometry of the reaction:
4 moles of ammonia produces 6 moles of water
So, 12 moles of ammonia will produce = [tex]\frac{6}{4}\times 12=18mol[/tex] of water
Hence, 18 moles of [tex]H_2O[/tex] will be produced.
an unknown gas diffuses 1.25 times faster than CO2 gas. What is the molar mass of the unknown gas?
Answer:
28.16 g/mol
Explanation:
From Graham's law;
Let the rate of diffusion of gas X be 1.25
Let the rate of diffusion of CO2 be 1
Molecular mass of gas X= M
Molecular mass of CO2 = 44g/mol
1.25/1=√44/M
(1.25/1)^2 = 44/M
1.5625 = 44/M
M= 44/1.5625
M= 28.16 g/mol
3. give reasons
(a) A gas fills completely the
vessel in which it is kept.
(b)A gas exerts pressure on the
walls of the container
(c) A wooden table should be
called a solid
(d) We can easily move our hand
in air but to do the same
through a solid block of wood we need a karate
expert
we need a karate expert.
Answer:
A.A gas exerts pressure on the walls of the container. Reason: They have high kinetic energy and negligible force of attraction to move constantly moving with high speed in all directions. ... These collisions of the gas particles with the container walls exert pressure on the walls of the container.
B A gas exerts pressure on the walls of the container due to imapact of its gas molecules with hight velocity .
C.A wooden table should be called a solid. Reason: It has a definite shape and volume. It is very rigid and cannot be compressed, i.e., it has a solid characteristic.
D.We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert. It is because the molecules of air has less force of attraction between them and a very small external force can separate them and pass through it.
Explanation:
Plz mark me as a brainlest
Explain the method of preparation of alkyl halides using phosphorus halide
Answer:
The phosphorus first reacts with the bromine or iodine to give the phosphorus(III) halide. These then react with the alcohol to give the corresponding halogenoalkane, which can be distilled off
hope this helps bby<3
If 43.2mL of 0.236 M NaOH reacts with 36.7 ml of H2so, what is the concentration of the H2SO
solution?
The concentration of the sulfuric acid in the solution is 0.55m
What is molarity?
Molarity is the measure of the concentration of any solute in per unit volume of the solution.
The reaction is
[tex]\rm NaOH+ 2H_2SO_4 \rightarrow Na_2SO_4 + 2H_2O[/tex]
[tex]\rm M = \dfrac{n}{V}[/tex]
Moles = molarity × volume
0.236 M × 43.2 = 10.19 mol
The number of moles of sodium hydroxide = 10.19 mol
The ratio is 1:2
Then the moles of sulfuric acid is 10.19 × 2 =
Now, the molarity (concentration) of sulfuric acid is
[tex]\rm M = \dfrac{20.39}{36.7} = 0.55 m[/tex]
Thus, the concentration of the sulfuric acid is 0.55m.
Learn more about molarity, here:
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State three pieces of evidence from the diagram which indicate that the plant is pollinated by wind. ( 3 marks)
Your image is saying "Can't load image on this device."
ELECTRICITY IS ALLOWED TO PASS THROUGH ACIDIFIED WATER USING THE FOLLOWING EXPERIMENTAL SETUP.
QUESTION: IDENTIFY THE PROCESS
Answer: Electrolysis is passing an electric current through a liquid containing ions so that decomposition reaction takes place.
Electrolysis is passing an electric current through a liquid containing ions so that decomposition reaction takes place.When an electric current is passed through acidified water, it decomposes to give hydrogen and oxygen gas. The hydrogen gas is obtained at the cathode and the oxygen gas is obtained at the anode.
Electrolysis is passing an electric current through a liquid containing ions so that decomposition reaction takes place.When an electric current is passed through acidified water, it decomposes to give hydrogen and oxygen gas. The hydrogen gas is obtained at the cathode and the oxygen gas is obtained at the anode.The reaction for decomposition of water into oxygen and hydrogen is as follows:
Electrolysis is passing an electric current through a liquid containing ions so that decomposition reaction takes place.When an electric current is passed through acidified water, it decomposes to give hydrogen and oxygen gas. The hydrogen gas is obtained at the cathode and the oxygen gas is obtained at the anode.The reaction for decomposition of water into oxygen and hydrogen is as follows:2H2O(l) -------> 2H2(g) + O2(g)
The radiostope radon 222 has a half life of 3.8 days. How much of a 73.9-g sample or radon 222 wouppd be left after 23 days ?? pls show an equation
Answer:
Is there a picture for it
Explanation:
because it would be a hard
Which emission causes the atomic number of a
nuclide to decrease by 2 and its mass number to
decrease by 4
Answer: an alpha particle/alpha emission
Explanation:
What is the electron structure of an oxygen atom?
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