Explanation:
Tectonic plate motion only occurs when the core of the planet is molten. If the planet does not have a magnetic field, then that means the core is frozen. If the core is frozen, then there is no plate motion
what is relative atomic
Answer:
The relative atomic mass of an element is defined as the weight in grams of the number of atoms of the element contained in 12.00 g of carbon-12.
When aluminum oxidizes in air, it forms aluminum oxide (Al2O3):
4Al(s)+3O2(g)→2Al2O3(s)
A 102 g sheet of aluminum oxide formed completely in excess oxygen.
How many grams of aluminum were oxidized?
27 g
51 g
54 g
102 g
Answer:
54g
Explanation:
al= 27gmol-1
al 2mol=54g
Answer: 54 g
Explanation:
B 2. Meena is at the seaside and drops a message in a bottle into the sea. Explain why the bottle floats and will not sink.
What is the only way to confirm that a chemical change has taken place?
O A. You can observe a color change.
B. You can see that the mass of material has changed.
C. You can record a temperature change.
D. You can tell that a new substance has formed.
Which type of molecule is acetone?
A. Amine
B. Ketone
C. Alcohol
D. Aldehyde
Answer: B. Ketone
Explanation: Another name for acetone is propanone, and it is the main ketone as it has the functional group in the middle, a CH3 on each side. Ketones have the C=O functional group.
Which of the following statements is true?
A. Energy can be created, but not destroyed.
B. Some machines are 100 percent efficient.
C. Atomic energy can't be converted into electricity.
D. When work is done, some energy is always "lost" as heat.
Answer:
D
Explanation:
Heat sometimes gets "lost" when work is done
Which factor
was most important in Pizarro's
conquest of the Incas?
O The Incan Empire had been weakened by a long civil
•
The Spanish were able to capture most of the Incas' artillery.
O Pizarro brought his vast personal wealth with him from Spain.
•
Pizarro's army engaged in guerilla warfare.
Answer:
A. The Incan Empire had been weakened by a long civil war.
Answer:
The correct answer is A. The Incan Empire had been weakened by a long civil war
Explanation:
I took the Test
________ is a type of root system.
Stemroot system
Taproot system
Leaf root system
Seedling root system
3. A woman has 7.9 * 10-3 mol of hemoglobin (molar mass = 64,456 g/mol) in her blood. How many grams of hemoglobin does she have in her blood?
The woman that has 7.9 * 10-3 mol of hemoglobin in her blood has 509.20 grams of hemoglobin in her blood.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass. That is;
mass = no. of moles × molar mass
According to this question, a woman has 7.9 × 10-³ mol of hemoglobin in her blood. The mass of hemoglobin in her blood is as follows:
mass = 7.9 × 10-³ × 64,456 g/mol
mass = 509.2grams.
Therefore, the woman that has 7.9 * 10-3 mol of hemoglobin in her blood has 509.20 grams of hemoglobin in her blood.
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Formation of Ionic bond
1. formation of Potassium Sulphide.
Answer:
It can be produced by heating K2SO4 with carbon (coke): K2SO4 + 4 C → K2S + 4 CO. In the laboratory, pure K2S may be prepared by the reaction of potassium and sulfur in anhydrous ammonia.
Label the equivalence point on the graph of pH versus volume of the titration of a strong acid
and strong base shown below.
a. What volume of base was needed to neutralize the acid?
b. What is the pH at the equivalence point?
c. how does the number of moles of hydro i um ions and hydroxide ions compare at the equivalence point?
Based on the titration curve, the titration is of a strong acid strong base and pH at equivalence point is 7.
What is equivalence point?The equivalence point in an acid-base titration is the point at which equal amount of acid and base have reacted.
The equivalence point in a strong acid-strong base titration is at pH 7.
In a weak acid-strong base titration, the pH is greater than 7 at the equivalence point.
In a weak base-strong acid titration, the pH is less than 7 at the equivalence point.
From the titration curve;
volume of base was needed to neutralize the acid is 50 mL pH at the equivalence point is 7the number of moles of hydronium ions and hydroxide ions at the equivalence point are equal.Therefore, the titration curve is of a strong acid strong base.
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Transverse and longitudinal waves can combine. Describe what kind of wave is formed and how such a wave can modeled in a lab?
Answer:
rotational
Explanation:
when something is move
Axel decided to start working out three times a week to stay healthy. Which type of disease prevention is being described?
Answer:
A
Explanation:
behavior modification
Evaluate
0.411+9.9+0.8
and round the answer appropriately.
Express your answer numerically using the appropriate number of decimal places.
( its not 11.111)
Answer:
11.1
Explanation:
the only reason i can think of why it wouldn't be 11.111 is improper rounding and sig figs. so if you round with sig figs it would be 11.1
The sum of the given values 0.411, 9.9, and 0.8 is 11.111 which on approximation gives 11.11.
To round the answer appropriately, we need to consider the desired number of decimal places. In this case, we are asked to express the answer numerically using the appropriate number of decimal places.
The sum of 0.411, 9.9, and 0.8 is:
0.411 + 9.9 + 0.8 = 11.11
Rounded to the appropriate number of decimal places, the answer is 11.11.
The answer is calculated using the appropriate number of decimal places.
Therefore, The sum of 0.411, 9.9, and 0.8 is 11.11.
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Calculate the solubility of Hg2Cl2 given that its ksp is 1.1*10^-18?
If 16.4 grams of copper (II) bromide react with 22.7 grams of sodium chloride, how many grams of sodium bromide are formed?
The amount of sodium bromide that would be formed from the reaction will be 7.5524 grams
Stoichiometric calculationLooking at the equation of the reaction:
[tex]CuBr_2 + 2NaCl --- > CuCl_2 + 2NaBr[/tex]
The mole ratio of CuBr2 and NaCl is 1:2.
Mole of 16.4 grams of CuBr2 = 16.4/223.37
= 0.0734 moles
Mole of 22.7 grams of NaCl = 22.7/58.44
= 0.3884 moles
Equivalent mole of NaCl = 0.1468 moles
Thus, NaCl is in excess while CuBr2 is limiting.
Mole ratio of CuBr2 and NaBr = 1:1
Mass of 0.0734 mole NaBr = 0.0734 x 102.894
= 7.5524 grams
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What mass of iron (III) chloride contains 2.35 x [tex]10^{23}[/tex] chloride ions?
Answer:
I hope it's help you that I knowHCl(aq) + ZnS (s) →
Express your answer as a chemical equation. Identify all of the phases in your answer.
How many moles of H20 are contained in 4.21 x 1024 molecules of H2O?
O A 2.53 x 1048 moles
OB. 2.34 x 1023 moles
C. 6.99 moles
OD. 0.143 moles
Answer:
C. 6.99 moles
Explanation:
To convert molecules to moles we simply divide the given number of molecules by Avogadro's number, 6.022 x 10²³
Given number of molecules : 4.21 x 10^24
Number of moles : 4.21 x 10^24 / 6.022 x 10²³ = 6.99 moles ( rounded )
The answer is C
the respect given to all kind of labour
give one word answer
please help me fast
Answer:
dignity
Explanation:
it is called the dignity of labour
how many molecules are in 90g of agno3
Answer:
0.5298072502356179
Explanation:
Write the balanced equation for the dissolution of NH4NO3 in water. If 3.5 mol NH4NO3 are dissolved, how many moles of each type of ion are produced? How many total moles of ions are produced?
Answer:
According to the balanced equation TWO moles ammonium nitrate produces FOUR moles of water. It’s a simple proportion. You get twice as many moles of water as you have ammonium nitrate.
Explanation:
How do Earth's plates move?
Don't give a copied answer
Answer:
Plates on Earth's surface shift as a result of strong heat in the Earth's core, which causes molten rock in the mantle layer to move. It flows in a pattern known as a convection cell, which formed as heated material rises, cools, and then sinks. As the cooled material lowers, it heats up and rises again.
Explanation:
Explain the oxidation of saturated fatty acids
Answer:
Fatty acids, obtained from the breakdown of triglycerides and other lipids, are oxidized through a series of reactions known as β-oxidation. In each round of β-oxidation, 1 molecule of acetyl-CoA, 1 molecule of NADH, and 1 molecule of FADH2 are produced.
The substance which is dissolved in a solution is called a:
solute
solvent
precipitant
colloid
Answer:
solute
A solute is a component in a solution that will be dissolved in the solvent.
Hope this helps. Have a wonderful day.
Answer:
solute
Explanation:
Cuánto equivale.1022 átomos de carbono en moles
Answer:
I don't understand your language sirWhat is a mass number (A)?
Answer:
The mass number in a nucleus is the combined number of protons and neutrons, so it's protons and neutrons, and A symbolizes it. So A is the number of masses, which is equal to the number of protons, that is the number of atoms that we symbolized by Z, plus the number of neutrons.
The mass number, also called atomic mass number or nucleon number, is the total number of protons and neutrons in an atomic nucleus. It is approximately equal to the atomic mass of the atom expressed in atomic mass units.
How many moles are in 239 g of iron? Express your answer to three significant figures.
HELP ASAP WHICH ONE IS THE ANSWE A OR B OR C OR D ???? ! !!!
Answer:
1. C
2.B
Explanation:
3. Suppose that a gas originally at standard temperature and pressure undergoes a change in which its pressure is quadrupled
What will be the temperature?
Let's see
Let
Pressure be PTemperature be TAccording to Amonton's or Gay Lussacs law
[tex]\\ \rm\Rrightarrow P\propto T[/tex]
So if pressure is quadrupled then temperature will be also quadrupled.