Answer:
paint on surface of object , oiling
Michael is studying the factors that affect corrosion of metals. He wants to test the effect that different concentrations of an acid will have on the corrosion of a metal. As he sets up and completes his experiment, which of the following experimental designs would be most likely to help him answer his question? A. Allow several metal samples to soak in different amounts of acid of a single concentration and then measure the amount of corrosion on each. B. Prepare solutions of different acid concentrations, measure 50 milliliters of each into different beakers, and place metal samples of different types but of the same mass into the beakers. C. After allowing several small metal sheets to be exposed to different acid concentrations, measure the surface area of each that is corroded. D. After allowing a small metal sheet to be exposed to one acid concentration, place it in different acid concentrations, then measure the surface area that is corroded.
Answer:
B. Prepare solutions of different acid concentrations, measure 50 milliliters of each into different beakers, and place metal samples of different types but of the same mass into the beakers.
Explanation:
Since Michael is studying the factors that affect corrosion of metals, and wants to test the effect that different concentrations of an acid will have on the corrosion of a metal, using different acid concentrations of the same volume on different metal samples of the same size would give a much better than all the other options because, a standard volume of acid is used and also a standard mass of metal is used. So, the effect can be measured quantitatively since we have the same quantity of sample.
So, option B is the answer
(PLEASE HELP 20 POINTS ON A TEST)
4.2 moles of an unknown gas at a pressure of 5.5 atm has a volume of 12.0 L.
What is the temperature?
Answer:
191.4K
Explanation:
Using the ideal gas law equation as follows:
PV = nRT
Where;
P = pressure (atm)
V = volume (L)
n = number of moles (mol)
R = gas law constant (0.0821 Latm/molK)
T = temperature (K)
According to the information provided in this question:
n = 4.2moles
P = 5.5atm
V = 12.0 L
T = ?
Using PV = nRT
5.5 × 12 = 4.2 × 0.0821 × T
66 = 0.345 T
T = 66/0.345
T = 191.4K
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."
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:
Question 10
The speed of a molecule in air is 340 m/s. How long does it take to travel a distance of 1100
meters?
about 2 seconds
about 1 second
about 4 seconds
about 3 seconds
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)
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.
a 0.5 mol sample of N2 is in a 6L container at 2 atm. what is the temperature of the gas in K
Answer:
300 K
General Formulas and Concepts:
Atomic Structure
Diatomic ElementsMolesGas Laws
Ideal Gas Law: PV = nRT
P is pressureV is volumen is molesR is gas constantT is temperatureExplanation:
Step 1: Define
Identify variables
[Given] n = 0.5 mol N₂
[Given] V = 6 L
[Given] P = 2 atm
[Given] R = 0.0821 L · atm · mol⁻¹ · K⁻¹
[Solve] T
Step 2: Solve for T
Substitute in variables [Ideal Gas Law]: (2 atm)(6 L) = (0.5 mol)(0.0821 L · atm · mol⁻¹ · K⁻¹)TMultiply [Cancel out units]: 12 atm · L = (0.04105 L · atm · K⁻¹)TIsolate T [Cancel out units]: 292.326 K = TRewrite: T = 292.326 KStep 3: Check
Follow sig fig rules and round. We are given 1 sig fig as our lowest.
292.326 K ≈ 300 K
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
A sample of gas at 10.0 ATM and 5.0 °C increases in tempature of 35 °C. If the volume is unchanged, what is the new pressure?
Answer:
11.08 atm
Explanation:
From the question given above, the following data were obtained:
Initial pressure (P₁) = 10 atm
Initial temperature (T₁) = 5 °C
Final temperature (T₂) = 35 °C
Final pressure (P₂) =?
Volume = constant
Next, we shall convert celsius temperature to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
Initial temperature (T₁) = 5 °C
Initial temperature (T₁) = 5 °C + 273
Initial temperature (T₁) = 278 K
Final temperature (T₂) = 35 °C
Final temperature (T₂) = 35 °C + 273
Final temperature (T₂) = 308 K
Finally, we shall determine the final pressure of the gas as follow:
Initial pressure (P₁) = 10 atm
Initial temperature (T₁) = 278 K
Final temperature (T₂) = 308 K
Final pressure (P₂) =?
P₁/T₁ = P₂/T₂
10/278 = P₂/308
Cross multiply
278 × P₂ = 10 × 308
278 × P₂ = 3080
Divide both side by 278
P₂ = 3080 / 278
P₂ = 11.08 atm
Therefore, the final pressure of the gas is 11.08 atm
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]
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
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
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
draw the structure of the following atoms
(1) 19/9 F
(2)28/14 SI
Answer:
might help
Explanation:
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:
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
Which particle has the least mass ? alpha particle B. beta particle neutronproton
Answer:
beta particle
Explanation:
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
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]
copper +sulfur + oxygen =
Molar mass is the total combined mass of a of a substance.
Answer:
molar mass
Explanation:
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:
I have a exam please answer fast
Answer:
C
[tex] \triangle \: H {}^{ \theta} _{s} = lattice \: energy + hydration \: energy \\ = + 2526 + ( - 2003 + (2 \times - 340)) \\ + 2526 - 2683 \\ = - 157 \: kjmol {}^{ - 1} [/tex]
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:
brainly.com/question/4481914
What is the difference between a concentrated solution of sulphuric acid and dilute solution of sulphuric acid
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:
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:
https://brainly.com/question/12990095
Help me and thanks YESSIR :) 10 points :)
Answer:
pen??????l think l m not sure
What is the enthalpy of reaction?
O A. The amount of mass involved in a reaction
O B. The heat released or absorbed in a reaction
C. The amount of heat a substance can hold
D. A measure of the temperature of a system
Answer:
Enthalpy is the amount of heat released or absorb. The total enthalpy can be found by subtracting the products' enthalpy by the reactants' enthalpy
