Answer:
Immunity
Explanation:
What was a result of the Zhou capital being destroyed by invaders?
A) Leaders of the feudal states declared independence.
B) Loyal relatives supported the king to protect the empire.
C) Feudal rulers began to use nomadic soldiers in their armies.
D) Philosophers gained power by encouraging citizens to rebel.
Answer:
A
Explanation:
Answer:
think it is D
Explanation:
hope this helps
How would you put this word equation into a balanced chemical equation: Aluminum nitrate reacts with potassium sulfate to produce aluminum sulfate and potassium nitrate.
Answer:
2Al(NO_{3} )_{3} + 3K_{2}SO_{4} ----> Al_{2}(SO_{4})_{3} + 6KNO_{3}
Explanation:
[tex]2Al(NO_{3} )_{3} + 3K_{2}SO_{4} ----> Al_{2}(SO_{4})_{3} + 6KNO_{3}[/tex]
How does heat differ from temperature?
O Temperature is the measure of heat.
O Temperature and heat are the same thing.
O Temperature measures thermal energy, and heat is the flow of thermal eneroy
O Temperature measures the loss of energy, and heat measures the gain of eneray.
Answer: Temperature measures thermal energy, and heat is the flow of thermal energy
Explanation:
Heat describes the transfer of thermal energy between molecules within a system. Heat measures how energy moves or flows. It is measured in Joules.
Temperature measures the hotmess or coldness of a body or how much thermal energy it contains . Temperature describes the average kinetic energy of molecules within a material or system. It is measured in Celsius (°C), Kelvin(K), or Fahrenheit (°F).
Thus the correct option is Temperature measures thermal energy, and heat is the flow of thermal energy
Answer:
its c
Explanation:
edg 2021
what is 1.602176*10-¹⁹/ 1.758820*10¹¹C kg-¹
with proper explanation.
or expanded form
Answer:
0.00000000910938;
9.109380 * 10^-9
Explanation:
Given the question :
Given :
1.602176*10-¹⁹/ 1.758820*10¹¹
The numbers are expressed in the form:
A * 10^b ; Where;
A = Coefficient ; 10 = base ; b = exponent
The Coefficients can be divided directly as :
1.602176 / 1.758820 = 0.9109380
Using the division law of indices, the exponents acn be worked out as follows since they have the same base :
10^-19 / 10^-11 = 10^(-19 - (-11)) = 10^(-19+11) = 10^-8
Thus, we have ;
0.9109380 × 10^-8
In standard form:
9.109380 * 10^-9
In Expanded form:
10^-8 = 0.00000001
0.9109380 * 0.00000001 = 0.00000000910938
0.000000009 +
0.0000000001 +
0.00000000000 +
0.000000000009 +
0.0000000000003 +
0.00000000000008
__________________
0.00000000910938
___________________
How many hydrogen atoms are present in .46 moles of NH3
Answer:
2.78 x 10²³
Explanation:
1 mole contains 6.02 x 10²³ hydrogen atoms => 0.46 mole contains 0.46(6.02 x 10²³) hydrogen atoms or 2.78 x 10²³ atoms.
Caution => When to use H vs H₂ => This problem is specific for 'hydrogen atoms' but some may simply say hydrogen. In such cases use H₂ or 'molecular hydrogen' is the focus. it's a matter of semantics, H vs H₂.
Scientists us ________waves to study the characteristics of Earth Layers_______ cannot travel through liquid, so the ________must be liquid.
Answer:
1)seismic 2) S-waves 3) outer core
Answer:the other comment is right
Explanation:
Suppose a student made a different sodium hydroxide solution using 0.401g of solid sodium hydroxide and 200mL of water. The student then standardized this solution using benzoic acid in a similar manner to that depicted in the simulation. From the following additional data recorded by the student: a) Mass of benzoic acid: 0.158g b) Volumer of the benzoic acid solution: 100.0mL c) Volume of sodium hydroxide need to neutralize the solution: 27.84mL Determine the molarity of the sodium hydroxide solution.
Answer:
0.05 M
Explanation:
Mass of benzoic acid= 0.158g
Volume of benzoic acid= 100 mL
Volume of sodium hydroxide = 27.84mL
Molar mass of benzoic acid= 122g/mol
Number of moles of benzoic acid= 0.158g/122g/mol= 1.3 × 10^-3 moles
C= no of moles/volume
C= 1.3 × 10^-3 moles × 1000/100
C= 0.013M
So;
Volume of acid VA = 100mL
Concentration of acid CA= 0.013M
Volume of Base VB = 27.84mL
Concentration of Base CB= ???
Number of moles of acid NA =1
Number of moles of Base NB= 1
From;
CAVA/CBVB= NA/NB
CAVANB= CBVBNA
CB= CAVANB/VBNA
CB= 0.013 × 100 × 1/27.84 × 1
CB= 0.05 M
Over time the Mexican-Free Tailed bat has evolved to be able to echolocate in the dark to find prey. Bats are able to see, but do not have very good vision
and rely on echolocation
The bats have developed the skill of echolocation in response to a lack of which of the following abiotic factors?
O oxygen
O water
O plants
Olight
Pls Help I’ll give brainly
Answer:
Light
Explanation:
1 They were not albe to see at night because it was dark so the lack of light caused them to use echolocation.
Hope this helps
3. A reaction of the type X → Y + Z has a rate constant k = 3.6 x 10-5 M/s. Determine
molarity of x after a reaction time of 30.0 min if the initial concentration of x is
0.096M
(3 marks)
Answer:
0.16 M.
Explanation:
Hello!
In this case, since the reaction can be determined as zeroth-order because of the units of M/s, we can write the rate law as:
[tex][X]=[X]_0-kt[/tex]
In such a way, since we need the initial concentration of X, we proceed as follows:
[tex][X]_0=[X]+kt[/tex]
So we plug in to obtain:
[tex][X]_0=0.096M+3.6x10^{-5}\frac{M}{s}*30.min*\frac{60s}{1min}[/tex]
[tex][X]_0=0.16M[/tex]
Best regards!
Do you think science will end the world or save the world or do neither?
Answer:
This is all up to you
Explanation: This question is up to you because you may think both or just one.
What is the characteristic of atoms
Answer:
Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature.
Name the following compound: S₂O₇
Answer:
disulfur heptoxide
Explanation:
How many moles are present in a 5.8 g sample of copper?
A. 11
B. 0.091
C. 0.91
D. 5.5 x 10^22
please i need this for my finals
Explanation:
Molar mass of Cu = 63.5g/mol
Moles of Cu
= 5.8g / (63.5g/mol) = 0.091mol (B)
The number of moles present in a 5.8 g sample of copper is equal to 0.0913 mol. Therefore, option B is correct.
What is a mole?A mole can be defined as an international scientific unit that is used to determine for given count of particles. The particles are commonly identical entities but they are individually distinct.
A mole of the substance can be used to evaluate a large number of atoms, molecules, or particular particles. The amount of material can be measured as chemical entities of a substance in a sample.
The number of units in 1 mole of a material is equal to 6.023×10²³ which is called Avogadro’s constant.
Given, the mass of the copper = 5.8 g
The mass of one mole of copper = 63.5 g
We can calculate moles as, n = Mass/molar mass
Then, the number of moles of copper = 5.8/63.5 = 0.0913 mol
Therefore, the number of moles of copper is 0.0913 mol.
Learn more about the mole, here:
brainly.com/question/26416088
#SPJ2
What is the percentage of the actual yield of the reaction of 2.5 mol of Fe(NO3),
with 3.6 mol of Na2Co3, to form 6.3 mol of NaNO3 according to the reaction :
2Fe(NO3)3 + 3NaC03 - >
Fe2(CO3)3 + 6NaNO3 ?
Answer:
Percent yield = 87.5%
Explanation:
Given data:
Number of moles of Fe(NO₃)₃ = 2.5 mol
Number of moles of Na₂CO₃ = 3.6 mol
Actual yield of NaNO₃ = 6.3 mol
Percent yield of NaNO₃ = ?
Solution:
Chemical equation:
2Fe(NO₃)₃ + 3Na₂CO₃ → Fe₂(CO₃)₃ + 6NaNO₃
now we will compare the moles of both reactant with NaNO₃.
Fe(NO₃)₃ : NaNO₃
2 : 6
2.5 : 6/2×2.5 = 7.5
Na₂CO₃ : NaNO₃
3 : 6
3.6 : 6/3×3.6 = 7.2
Theoretical yield of NaNO₃ is 7.2 mol.
Percent yield:
Percent yield = actual yield / theoretical yield ×100
Percent yield = 6.3 mol / 7.2mol ×100
Percent yield = 87.5%
Suppose a highly positive ion was attracted to a membrane. At what location would that most likely occur? a) the head of a lipid b) the tail of a lipid c) the nonpolar portion of a protein d) the double bond located within a lipid
Answer:
A highly positive ion was attracted to a membrane and their locations is explained in details.
Explanation:
1.
The Head of a lipid is hydrophilic (polar). This cover can be bearing negative or positive charges. This is that charge that creates the head hydrophilic(communicate with water(a polar molecule, including negative and positive unfair charges).
The tail is hydrophobic (non-polar). This part doesn't include any charge that enhances hydrophobic. (Does not combine with water.
Now a positive ion can be brought only to electron-rich stations. We cannot say that this situation is forever the hydrophilic part.
A dual bond is an electron-rich situation. So the ion will be drawn to the dual bond place of a lipid.
2.
A conveyor that needs energy is active transport.
3.
The use of a membrane is to stop the particles and ions from passing crosswise it openly. So through the membrane, in an active carrier, we require input energy to transfer molecules beyond it.
What is the scientific name for the substance that is dissolving in a solution?
Answer:
The solute is the substance that is being dissolved,
Explanation:
A solution is a homogeneous mixture consisting of a solute dissolved into a solvent .
Answer:
solutes
Things which dissolve are called solutes and the liquid in which they dissolve is called a solvent to form a solution. Strongly polar substances easily attract water molecules. The water molecules surround the charged solute.
Explanation:
Took the same test and that was the one that was right hope this helps you
Of the choices below, which is the most abundant gas in Earth's atmosphere?
Practice
A
argon
B
nitrogen
C
carbon dioxide
D
oxygen
Answer:
B. Nitrogen
Explanation:
Hope this helps :)
The answer is nitrogen gas.
What happened to the celery if you put in food color water
Answer:
the celery would change colour!
Explanation:
18.2 mL of a 0.156 M solution of lead(II) nitrate are added to 26.2 mL of a 0.274 M solution of potassium iodide.
What is the mass of the Pbl2 precipitate formed in the reaction Pb(NO3)2 (aq) + 2 KI (aq) - Pbl2 (s) + 2 KNO3? The molar mass of Pbly is 461.0 g/mol.
Provide your answer in units of grams, with the correct number of significant digits. Enter your answer as a number only; do not include units.
The mass of the Pbl2 : 1308.87
Further explanationGiven
18.2 mL of a 0.156 M Pb(NO3)2
26.2 mL of a 0.274 M KI
Reaction
Pb(NO3)2 (aq) + 2 KI (aq) - Pbl2 (s) + 2 KNO3
Required
the mass of the Pbl2
Solution
mol Pb(NO3)2 = 18.2 x 0.156 = 2.8392 mlmol
mol KI = 26.2 x 0.274 =7.1788 mol
Limiting reactant Pb(NO3)2(smaller ratio of mol : reaction coeffiecient)
mol Pbl2 based on limiting reactant (Pb(NO3)2)
From equation, mol ratio of Pb(NO3)2 : Pbl2 = 1 : 1, so mol Pbl2=mol Pb(NO3)2=2.8392
Mass Pb(NO3)2 :
[tex]\tt mass=mol\times MW\\\\mass=2.8392\times 461\\\\mass=1308.87~grams[/tex]
Which segment of this graph shows a decreasing velocity?
Answer:
The segment of this graph that shows a decreasing velocity is the EF segment. AB and DE segments show that whatever was moving, in these segments was stopped. The segment BC shows an increase in velocity - the metres travelled were always more as the time went by.
Explanation:
The number 5726.302 written to two significant digits is:
Answer:
2 is the answer your welcom
A cube of an unknown metal measures 0.200 cm on one side. The mass of the cube is 52 mg. Which of the following is most likely the unknown metal?
Metal Density(g/cm^3)
rhodium 12.4
copper 8.96
niobium 8.57
vanadium 6.11
zirconium 6.51
a. copper
b. rhodium
c. niobium
d. vanadium
e. zirconium
Answer:
Option E. Zirconium
Explanation:
From the question given above, the following data were obtained:
Length of side (L) of cube = 0.2 cm
Mass (m) of cube = 52 mg
Name of the unknown metal =?
Next, we shall determine the volume of the cube. This can be obtained as follow:
Length of side (L) of cube = 0.2 cm
Volume (V) of the cube =?
V = L³
V = 0.2³
V = 0.008 cm³
Next, we shall convert 52 mg to g. This can be obtained as follow:
1000 mg = 1 g
Therefore,
52 mg = 52 mg × 1 g / 1000 mg
52 mg = 0.052 g
Thus, 52 mg is equivalent to 0.052 g.
Next, we shall determine the density of the unknown metal. This can be obtained as follow:
Mass = 0.052 g.
Volume = 0.008 cm³
Density =?
Density = mass / volume
Density = 0.052 / 0.008
Density of the unknown metal = 6.5 g/cm³
Comparing the density of the unknown metal i.e 6.5 g/cm³ with those given in table in the above, we can conclude that the unknown metal is zirconium
If you add 0.001 moles of sodium chloride to a liter of water, what will be the pH of the solution?
Answer:
The pH of the resulting solution will be 7.
Explanation:
Sodium chloride is a salt that is formed from the reaction of sodium hydroxide (a strong base) and hydrochloric acid ( a strong acid), as shown below.
[tex]NaOH \ + \ HCl ----> \ NaCl \ + \ H_2O[/tex]
Generally, when strong acids react with strong bases, neutral salts and water are formed. Sodium Chloride (NaCl) is an example of such neutral salts formed.
Since sodium chloride (NaCl) is neutral, its concentration will not alter the pH of the water and the pH of the resulting solution will be 7.
Explain what is meant by a half-life of 150 years. Then, write a function that models the amount, A, of a 100-mg sample remaining after T years for a substance with a half-life of 150 years. Use graphing software to graph the equation. Answer in complete sentences.
Answer:
Half-life of 150 years are those year that a radioactive element take to disintegrate to a half of it's original value.
I don't have graphical software
How many mL of 0.105 M aqueous NaOH solution are required to neutralize 40.0 mL of 0.210 M aqueous H2SO4 solution?
H 2SO 4 + 2 NaOH ---> Na 2SO 4 + 2 H 2O
Answer:
160 mL
Explanation:
Given data:
Molarity of NaOH = 0.105 M
Volume of H₂SO₄ = 40.0 mL (40.0/1000 = 0.04 L)
Molarity of H₂SO₄ = 0.210 M
Volume of NaOH required = ?
Solution:
Number of moles of of H₂SO₄:
Molarity = number of moles / volume in L
0.210 M = number of moles / 0.04 L
Number of moles = 0.210 mol/L × 0.04 L
Number of moles = 0.0084 mol
now we will compare the moles of H₂SO₄ with NaOH.
H₂SO₄ : NaOH
1 : 2
0.0084 : 2/1×0.0084 = 0.0168 mol
Volume of NaoH:
Molarity = number of moles / volume in L
0.105 M = 0.0168 mol / Volume in L
Volume in L = 0.0168 mol / 0.105 M
Volume in L = 0.16 L
Volume in mL:
0.16 L × 1000 mL/ 1L
160 mL
The volume of the NaOH solution required for the reaction is 160 mL
The balanced equation for the reaction is given below:
H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2Finally, we shall determine the volume of the base, NaOH required for the reaction.
Molarity of the base, NaOH (Mb) = 0.105 MVolume of the acid, H₂SO₄ (Va) = 40 mL Molarity of the acid, H₂SO₄ (Ma) = 0.210 M Volume of the base, NaOH (Vb) =?MaVa / MbVb = nA/nB
(0.21 × 40) / (0.105 × Vb) = 1 / 2
8.4 / (0.105 × Vb) = 1 / 2
Cross multiply
0.105 × Vb = 8.4 × 2
0.105 × Vb = 16.8
Divide both side by 0.105
Vb = 16.8 / 0.105
Vb = 160 mL
Thus, the volume of the base, NaOH required for the reaction is 160 mL
Learn more about stoichiometry: https://brainly.com/question/21182105
When poured into water, glycerol (also a liquid) falls to the bottom of the
beaker. Which of the following is a true statement? *
The water is less dense than the glycerol
An object that floats in water will always float in glycerol
O An object that floats in glycerol will always float in water
Answer:
im going to go with the water is less dense than the glycerol
Explanation:
What must a scientist do in order to develop a testable hypothesis?
A. Research accepted scientific theories to find one that is wrong.
B. Determine whether the conclusion is supported by popular opinion.
C. Find out whether the idea would be interesting to other scientists.
D. Ask a question that can be answered by making observations.
Answer:
The correct answer is D. Ask a question that can be answered by making observations.
Explanation:
Basically, in order to develop a testable hypothesis, scientists must adhere to the guidelines of the scientific method.
The scientific method is usually understood to be a so-called hypothetical-deductive method, the core of which is to make hypotheses based on observations or measurements, to make predictions based on them and to check the validity of predictions by repeated experiments. More generally, the scientific method is a general way of obtaining solid knowledge, using many means of proof, both empirical and theoretical, to achieve certainty. The scientific method is a widely recognized tool in the scientific community for seeking objectivity, reliability and transparency in research.
The graph models the amount remaining, in milligrams, of a radioactive substance as a function of time, in years. Explain the meaning of the point (3100) shown on the graph. Answer in complete sentences.
Answer:
Where is the grahppppp?!!!!
Help me please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Wave 2
Explanation:
Higher frequency means more energy per second, And wave 2 has higher frequesncy
please mark brainliest I’m almost at expert level
Answer:
I believe it is wave 2
Explanation:
As you can see in the graph, wave two happens to be more frequent. There are well, more waves than the first graph. Please forgive me if I am wrong. I tried my best to explain
What else is produced during the combustion of propane, C3H8?
H2O ,
C3H8,
O2,
or
C3H8O2?
Answer:
H20
Explanation:
Answer:
The answer is H20
Explanation: