Answer:
False
Explanation:
Because laws and theories are developed for different purposes, laws never become theories, and theories do not become laws.
An atom contains one proton, one electron, and one neutron. Which two particles are most similar in mass?
O the neutron and the electron
O the proton and the electron
O the proton and the neutron
O the neutron and the atom
Answer:
the pro on and the electron
In a titration, 25.0 mL of a 0.40 M NaOH solution is used to neutralize 10.0 mL of HCl. Calculate the molarity of the acid.
The molarity of the HCl acid will be 0.001 M.
What is Neutralization ?A neutralization reaction is when an acid and a base react to form water and a salt and involves the combination of H⁺ ions and OH⁻ ions to generate water.
This is the neutralization of a strong acid (HCl) and a strong base (NaOH), which is ruled by this equation :
HCl (aq) + NaOH (aq) → NaCl (aq) + H₂O (l)
Mole Ratio : 1 mol HCl : 1 mol NaOH
Formula used ;
Molarity = number of moles / Volume (in liters)
Solve for n ;
n = M × V
Substitute values and compute ;
n = 0.40 M × 0.025 liter = 0.01 moles NaOH.
As the molar ratio is NaOH : HCl
Therefore, there will be same number mole for the HCl
Now, Molarity of HCl Solution ;
Molarity = n / volume
Molarity = 0.01 / 10
= 0.001 M HCl
Hence, The molarity of the HCl acid will be 0.001 M.
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If a gas occupies 1532.7 mL at standard temperature, what volume does it occupy at 49.4 ºC if the pressure remains constant?
a. 1810
b. 1300
c. 276
d. 3.80e5
Answer:
a. 1810mL
Explanation:
When conditions for a gas change under constant pressure (and the number of molecules doesn't change), it follows Charles' Law:
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex] where the temperatures must be measured in Kelvin
To convert from Celsius to Kelvin, add 273, or use the equation: [tex]T_C+273=T_K[/tex]
For this problem, one must also recall that standard temperature is 0°C (or 273K).
So, [tex]T_1 = 273[K][/tex], and [tex]T_2 = (49.4+273)[K]=322.4[K][/tex].
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K])}=\dfrac{V_2}{(322.4[K])}[/tex]
[tex]\dfrac{(1532.7[mL])}{(273[K\!\!\!\!\!{-}])}(322.4[K\!\!\!\!\!{-}] )=\dfrac{V_2}{(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})}(322.4[K]\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!\!{----})[/tex]
[tex]1810.04571428[mL]=V_2[/tex]
Adjusting for significant figures, this gives [tex]V_2=1810[mL][/tex]
A volumetric pipette has one marked line that indicates a specific volume. Considering polar substances dip downward in a glass volumetric pippette creating a concave meniscus, what is the correct way to read a volumetric pipette to have the most accurate measurement?.
The best way to make an accurate measurement of the height of a polar liquid is to take the reading from the lowest point of the meniscus.
What is the meniscus of a liquid?The meniscus of a liquid is a curved that occurs at the top of a liquid placed in a container as a result of the attractive forces between the molecules of a the liquid.
Polar substances such as water have a concave meniscus as they dip downwards.
Therefore, the best way to make an accurate measurement of the height of a polar liquid is to take the reading from the lowest point of the meniscus.
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2. The table below shows the atomic numbers of elements of the periodic table represented by letters I to Q The letters are not the actual chemical symbols for the elements. Element J Atomic number www I 且 } T H 3 Lithiur K 7 Witrogen 8 Select two elements which belong ta Olygin The same period of the periodic table Jk The same group of the period table. Select the element which: twitt form a divalent andon Reacts murst vigorously with water. 9 N Home 10 (Ink (1mk bºr (Ink 12 May Nashy 13 Aluminian C 14 St Veer
Explanation:
cudhdbsieehe eirbruwnee8ebeuw eodjsuww8
A substance has a melting point of 80 °C. Which of the following is true for the substance? (5 points)
a) It will also change from a liquid to a gas at 80 °C while the liquid loses energy.
b) It will also change from a liquid to a gas at 80 °C while the liquid gains energy.
c) It will also change from a liquid to a solid at 80 °C while the liquid gains energy.
d) It will also change from a liquid to a solid at 80 °C while the liquid loses energy.
Answer:
D
Explanation:
The liquid loses energy while being cooled. It therefore changes to a solid when the liquid is cooled from a temperature above 80°C to 80°C
A substance has a melting point of 80 °C. It will also change from a liquid to a solid at 80 °C while the liquid loses energy and the correct option is option D.
At the substance's melting point of 80 °C, it undergoes a phase transition from a liquid to a solid. During this transition, the substance loses energy to the surroundings as it releases heat to form a solid structure. The process is called solidification or freezing.
As the substance cools down from a higher temperature to 80 °C, its molecules lose kinetic energy, and they arrange themselves into a more ordered and stable lattice, resulting in the formation of a solid. This release of energy is why the liquid loses energy during the transition. Once the substance reaches 80 °C, it remains at this temperature until the entire amount has solidified.
Thus, the ideal selection is option D.
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Phase change involves changing states of matter (solid-liquid-gas). How do these three states of matter differ from each other? (on a molecular level)
solid : the molecules are tightly packed
liquid : the molecules have some space in them
gas : molecules can freely move around
Waste water from nuclear power plants is generally:
Answer:
Nuclear energy produces radioactive waste
A major environmental concern related to nuclear power is the creation of radioactive wastes such as uranium mill tailings, spent (used) reactor fuel, and other radioactive wastes. These materials can remain radioactive and dangerous to human health for thousands of years.
The limiting reactant, O2, can form up to 2.7 mol Al2O3. What mass of Al2O3 forms?
Al2O3 : 101.96 g/mol
[?] g Al₂O3
Answer:
280 g Al₂O₃
Explanation:
To find the mass, you need to multiply the given value by the molar mass. This will cause the conversion because the molar mass exists as a ratio; technically, the ratio states that there are 101.96 grams per every 1 mole Al₂O₃. It is important to arrange the ratio in a way that allows for the cancellation of units. In this case, the desired unit (grams) should be in the numerator. The final answer should have 2 sig figs to reflect the given value (2.7 mol).
Molar Mass (Al₂O₃): 101.96 g/mol
2.7 moles Al₂O₃ 101.96 g
------------------------ x ------------------- = 275 g Al₂O₃ = 280 g Al₂O₃
1 mole
How many moles of oxygen gas (02) are needed to completely react with 54.0 g of aluminum?
4A1+30₂2Al₂O3
54.0 g Al
1 mol Al
26.98 g Al
3 mol O₂
4 mol Al
[?] mol O₂
1.5 moles of [tex]O_{2}[/tex] gas
Reaction of Al with [tex]O_{2}[/tex] to form [tex]Al_{2} O_{3}[/tex] is given below...
2 Al + 1.5 [tex]O_{2}[/tex] → [tex]Al_{2} O_{3}[/tex]
Here, 2 moles of Aluminum reacts with 1.5 moles of [tex]O_{2}[/tex]
atomic weight of aluminum = 27 g / mole
so, 1 mole of aluminum contains 27 g
then how many moles are there if it has 54 g in it.
moles of aluminum in 54 g = 54/27 = 2 moles
As per the equation mentioned above,
2 moles of aluminum reacts with 1.5 moles of [tex]O_{2}[/tex].
∴1.5 moles of oxygen gas (02) are needed to completely react with 54.0 g of aluminum.
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which type of scientist would most likely study how the size of the lemming population affects the size of the snowy owl population?
A. A biologist
B. A sociologist
C. A chemist
D. A physicist
HELP PLS
The type of scientist would most likely study how the size of the lemming population affects the size of the snowy owl population is a biologist.Thus, the correct option is (D)
What Biologist does ?
Biologists study humans, plants, animals, and the environments in which they live.
They may conduct their studies--human medical research, plant research, animal research, environmental system research--at the cellular level or the ecosystem level or anywhere in between.
Hence, The type of scientist would most likely study how the size of the lemming population affects the size of the snowy owl population is a biologist.Thus, the correct option is (D)
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Initial Activity- What mass of solute will dissolve in 100g of water at the following temperatures?
• KNO3 at 70°C =
• NaCl at 100°C=
• NH4Cl at 90°C=
The mass of solute will dissolve in 100g of water at the following temperatures will be 153 gms, 40 gms, 70gms simultaneously.
How dissolution of solute is affected by temperature ?On increasing temperature the amount of solute for dissolution decreases.
It is independent of the nature of solute.
Hence,
KNO₃ at 70degree = 153 gmsNaCl at 100 degree = 40 gmsNH₄Cl at 90 degree = 70gmsLearn more about dissolution here ;
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Which word equation best describes the following formula equation:
4Al+3O2→2Al2O3?
A. Four molecules of aluminum and three molecules of diatomic oxygen react to form two molecules of aluminum oxide.
B. Four molecules of aluminum react with six molecules of oxide to form twelve molecules of aluminum oxide.
C. Two molecules of aluminum oxide reacts to form three molecules of oxygen and four molecules of aluminum.
D. Aluminum reacts with oxide to form aluminum oxide.
Option A is the correct answer that describes the equation best as compared to other statement.
Which statement best describes the equation?Four molecules of aluminum and three molecules of diatomic oxygen react to form two molecules of aluminum oxide is the statement best describes the equation because this statement have same number of molecules that reacted in the equation. We considered an equation correct that have wrong numbers in front of atoms.
4Al+3O2------------>2Al2O3
So we can conclude that option A is the correct answer that describes the equation best as compared to other statement.
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When methane, CH4, is combusted, it produces carbon dioxide, CO₂, according to the unbalanced equation: CH4 +0₂ - CO₂ + H₂O.
Write the balanced equation for this reaction, and explain how it is possible for 10 grams of methane fuel to burn and emit 27 grams of carbon dioxide. Discuss whether or not this reaction obeys the law
of conservation of mass. (5 points)
The balanced equation will be [tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex]
Stoichiometric problemsThe balanced equation of the reaction would be as follows:
[tex]CH_4 + 2O_2 --- > CO_2 + 2H_2O[/tex]
The mole ratio of methane to carbon dioxide is 1:1.
10 grams of methane will give 10/16 = 0.625 moles
0.625 moles of carbon dioxide would give 0.625 x 44.01 = 27.506 grams.
Thus, 10 grams of methane will produce approximately 27 grams of carbon dioxide stoichiometrically.
The reaction obeys the law of conservation of mass because the atoms of all the elements before and after the reaction are balanced.
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Can you find the difference between the following changes? why? a)rolling of chapati from dough b) baking of chapati
Answer:
They have different temperatures.
Explanation:
Answer:
a. when we are rolling the dough it only changes the shape, its a physical change.
b. we cant change the shape once its cooked, its a chemical change
Explanation:
hope it helps
Warning signs are sometimes placed on aerosol cans to prevent people from throwing them into a fire. What is true about the gas in the aerosol can after it is placed in a fire? Check all that apply.
Answer:
If the gas in the aerosol is placed in a fire then the volume will remain constant.
Explanation:
Avogadro's Law provides the formula needed to determine the relationship between the gas amount and volume present in a container.
Plez na me brainliestt
What functional group is found in a carboxylic acid?
OA. Ester
B. Amino
C. Carbonyl
D. Hydroxyl
Answer:
the answer is c
Explanation:
A carboxylic acid is an organic compound that contains the carboxyl functional group.
what is carbon cycle
When Earth receives energy from the Sun, ____. a. some energy is reflected back into space b. some is absorbed by the atmosphere c. some is absorbed by land and water on Earth's surface d. all of the above Please select the best answer from the choices provided A B C D
Answer:
D - all of the above
Explanation:
Help me please!! Is for my finals!!
Answer:
C.) They have fewer electrons than protons
Explanation:
Charges on ions are determined by the ratio of electrons to protons. Neutral elements have the same number of protons and electrons. Remember: protons have a positive charge and electrons have a negative charge. However, based on the amount of electrons these elements have, some are more or less willing to give up their electrons to participate in ionic bonding. Potassium usually gives up 1 electron because this satisfies the octet rule. By removing this electron, the element has more protons than electrons, giving it an overall +1 charge.
What are two ways in which the safe house of lean might influence a product owner?
The safe house of lean might influence a product owner to provide better customer service.
What is the main purpose of safe house of lean?The safe house of lean is designed to provide ultimate value to the customer one the shortest possible time.
Employing the safe house of lean might influence the product owner in the following two ways:
enable the product ownerr work together with Agile Teams to develop stories with clear acceptance criteria.assist Agile Teams gain a clear understanding of their customers and how best to serve them.Therefore, the safe house of lean might influence a product owner to provide better customer service.
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15. What will be the volume of a given mass of oxygen at 250C if it occupies 100cm3 at 150C.? (Pressure remain constant)
Answer:
V₂ = 167 cm₃
Explanation:
Because you are only dealing with volume and temperature, you can use Charles' Law to find the missing value. This formula looks like this:
V₁ / T₁ = V₂ / T₂
In this formula, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You have been given values for all of the variables except for final volume. Therefore, by plugging these values into the formula, you can simplify to find your answer.
V₁ = 100 cm³ T₁ = 150 °C
V₂ = ? T₂ = 250 °C
V₁ / T₁ = V₂ / T₂ <---- Charles' Law formula
(100 cm³) / (150 °C) = V₂ / (250 °C) <---- Insert values
(0.667) = V₂ / (250 °C) <---- Simplify left side
(0.667) x (250 °C) = V₂ <---- Rearrange
167 = V₂ <---- Simplify left side
How many moles of LiCl will I have if I start off with .425 moles of CaC12?
Balanced
Moles of CaCl_2=0.425mol
1 mol CaCl_2 producees 1 mol LiCl
Moles of LiCl
0.425(1)0.425molesThe equation is
[tex]\\ \tt{:}\dashrightarrow LiOH+CalCl_2\longrightarrow LiCl+Ca(OH)_2[/tex]
This is balanced1mol of LiCl needs 1 mol CaCl_2
Then
0.425mol of CaCl_2 will produce 0.425mol LiCl
There are two common oxides of copper; one is 80% copper and the other is 89% copper by weight. Calculate the formula and name each compound.
80% copper (Cu)
Cu: 80 : 63.546 = 1.259
O: 20 : 16 = 1.25
Cu:O = 1 : 1
the formula: CuO
89% copper (Cu)
Cu: 89 : 63.546 = 1.4
O: 11 : 16 = 0.6875
Cu:O = 2:1
the formula: Cu₂O
Does an electron cause an electromagnetic wave to vibrate
Yes, an electron cause an electromagnetic wave to vibrate.
What is an electromagnetic wave?One of the waves is propagated by simultaneous periodic variations of electric and magnetic field intensity and that includes radio waves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
Electromagnetic waves are produced when something vibrates—an electric charge that moves back and forth.
When an electric charge vibrates, the electric field around it changes. Because the electric charge is in motion, it also has a magnetic field around it.
This magnetic field also changes as the charge vibrates.
Therefore, an electron causes an electromagnetic wave to vibrate.
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Assertion (A): Naphthalene balls disappear with time without leaving any solid.
Reason (R): Solid converted to liquid is called sublimation.
a) Both A and R are true and R is the correct
explanation of A.
b) Both A and R are true but R is not the
correct explanation of A.
c) A is true but R is false. d) A is false but R is true.
Explanation:
a) Both A and R are true and R is the correct
explanation of A.
Answer:
[tex]\fbox {c) A is true but R is false.}[/tex]
Explanation:
Assertion (A):
⇒ Naphthalene balls disappear with time without leaving any solid.
⇒ True √
Reason (R):
⇒ Solid converted to liquid is called sublimation.
⇒ False ×
⇒ Solid converted to liquid is called melting
Kajal is a compound or a mixture?
Which element is most likely to have a high thermal conductivity
Copper has the highest thermal conductivity as compared to other metals in the periodic table.
What is thermal conductivity?Thermal conductivity refers to the rate at which heat is transferred by conduction through a unit cross-section area of a material. When a temperature increases at one end it moves to the other end through conduction.
So we can conclude that Copper has the highest thermal conductivity as compared to other metals in the periodic table.
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In a process called photosynthesis, plants use carbon dioxide and water, along with energy from sunlight, to produce sugar and oxygen. photosynthesis is represented by the equation what must a plant need to produce 4 molecules of sugar? 6 molecules of co2 6 molecules of h2o 18 molecules of co2 24 molecules of h2o
24 molecules of H2O are needed by the plant to produce 4 molecules of sugar.
What is photosynthesis?The process by which plants convert carbon dioxide, water, and sunlight into oxygen and sugar-based energy is known as photosynthesis.
The photosynthesis equation is as follows:6CO2 + 6H2O + Sunlight → C6H12O6 + 6O2
The following three significant activities are involved in photosynthesis:
1. Chlorophyll absorbs light energy.
2. Water molecules are divided into hydrogen and oxygen and light energy is converted to chemical energy.
3. Carbon dioxide is converted to sugars.
Therefore, a plant needs four molecules of H2O and four molecules of CO2 to make one molecule of glucose or sugar, hence a plant needs 24 molecules of H2O and 24 molecules of CO2 to make four molecules of sugar.
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Answer:
D) 24 molecules of H2O
Explanation:
Just did the test on Edge 2023 and got it right. Have a nice day :)
The density of water is 1 g/cm3. brent used the following method to convert 1 g/cm3 to kg/m3.
(1 kg = 1,000 g and 1 m = 100 cm)
what is the error in brent's conversion method?
a - 1 kg should be written as 1 g.
b - (1 m)3 should be written as (1 cm)3.
c - 1,000 kg should be written as 1,000 g.
d - (100 cm)3 should be written as (100 m)3.
Answer:
a) The wrong denominator for the equivalent fraction of kilograms to grams
b) The use of the scale factor of length rather than the scale factor of volume for the equivalent fraction of cubic centimeters to cubic meters
c) The arrival at the correct 1000 kg/m³ rather than 0.1 g/m³ based on the expression on the left of the equation
The density of water = 1 g/cm³
The given equation is presented as follows;
1 g/cm³ × 1 kg/(1000 kg) × 100 cm³/(1 m³) = 1000 kg/m³
The error in the conversion method are;
a) The conversion, 1 kg/(1,000 kg) has an error, the correct conversion is (1 kg)/1,000 g)
b) The volume conversion error, 100 cm³/(1 m³), the correct volume conversion is (100 cm)³/(1 m³) = 1,000,000 cm³/(1 m³)
c) The right of the equal to sign error; using the left side expression only, the (wrong) answer is 0.1 g/m³
The correct equation is presented as follows;
1 g/cm³ × 1 kg/(1000 g) × 1,000,000 cm³/(1 m³) = 1000 kg/m³
Explanation: hope this help.
Answer:
c - 1,000 kg should be written as 1,000 g.
Explanation:
got it correct on the test.