Answer: B) It presents the correct sequence of events in Earth’s history.
Explanation: edge 2021
If 0.500 moles of silver nitrate were consumed, how many moles of calcium nitrate would be produced?(make sure to balance the chemical equation first)
AgNO3 + CaCl2 → Ca(NO3)2 + AgCl
Answer:
Explanation:
AgNO3 + CaCl2 ⇒ Ca(NO3)2 +AgCl
2AgNO3 + CaCl2 ⇒ Ca(NO3)2 + 2AgCl
List at least three different properties that would help you determine whether the bars are made of the same metal.
Answer:
Refractive index
Heat capacity
Density
Explanation:
Properties that are used to identify materials are called intensive properties. These intensive properties are characteristic of the material and does not depend on the amount of material present.
Thus, if i want to identify whether the three bars are made of the same metal, i can look out for the following properties;
Refractive index
Heat capacity
Density
These properties are intensive properties thus they can be used to identify an unknown substance.
What property is not included in Dalton’s atomic model ?
What is the mass of 2.15 liters of N2 gas at STP?
1.82 grams
2.68 grams
2.92 grams
3.11 grams
Answer:
2.68
Explanation:
Considering the definition of STP conditions, the mass of 2.15 liters of N₂ gas at STP is 2.68 grams.
Definition of STP conditionThe STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
Molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance. In other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of N₂ gasYou can apply the following rule of three: if by definition of STP conditions 22.4 L are occupied by 1 mole of N₂, 2.15 L are occupied by how many moles of N₂?
[tex]amount of moles of N_{2} =\frac{2.15 Lx1 mole}{22.4 L}[/tex]
amount of moles of N₂= 0.096 moles
In this case, the molar mass of N₂ is 28 g/mole.
Now, you can apply the following rule of three: If 1 mole of N₂ contains 28 grams, 0.096 moles of N₂ contains how much mass?
[tex]mass of N_{2} =\frac{0.096 molesx28 grams}{1 mole}[/tex]
mass of N₂= 2.68 grams
Finally, the mass of 2.15 liters of N₂ gas at STP is 2.68 grams.
Learn more about STP conditions:
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help pls! this is for chemistry tmr is my last day in trying to get this in
Answer:
130.76g of Zn are needed
Explanation:
Zinc, Zn, reacts with silver nitrate, AgNO3, as follows:
Zn + 2AgNO3 → Zn(NO3)2 + 2Ag
Where 1 mole of Zn reacts with 2 moles of AgNO3
For a complete reaction of 4 moles of AgNO3 are needed:
4mol AgNO3 * (1mol Zn / 2mol AgNO3) = 2mol Zn
The mass of Zn is (Molar mass: 65.38g/mol):
2mol Zn * (65.38g / mol) =
130.76g of Zn are neededwhat is the ideal gas constant?
A.it is a constant that applies only at STP
B.it is a specific constant for a specific gas
C.it is constant that depends on the conditions
D.it is a universal constant for all glasses
Please help me school ends tomorrow
Which scenario describes a transfer of mechanical energy to heat and sound energy?
Question 7 options:
A)
a plant using energy from the sun to create food
B)
a very high pitched sound causing a glass to break
C)
talking into a microphone.
D)
clapping hands
Answer:
D) clapping handsExplanation:
hope it's helpful
Which of the following correctly describes the role of the mouth in the digestive system?
The mouth acts like a muscular bag by churning the food and producing enzymes that aid in chemical digestion.
The mouth produces all of the enzymes needed for digestion and these enzymes are swallowed, which moves them through the digestive tract.
The mouth begins the process of digestion by mechanically breaking food into smaller pieces.
The mouth performs the peristalsis that pushes food through the rest of the digestive system.
Answer:
The mouth begins the process of digestion by mechanically breaking food into smaller pieces.
Explanation:
Digestion is a crucial process that involves the break down of complex food molecules into simpler ones that are assimilable by the body. The process of digestion in humans, for example, is said to begin in the MOUTH where the food enters through.
The mouth via the use of teeth helps the initially break down the food particles using mechanical/physical method. This further helps the break down of the food into tiny particles before they are acted on enzymatically.
(reply w the answer or get reported) Please answer this
Explanation:
The distribution of electrons of an atom or molecule in an atomic orbital is called electronic configuration.
1. The electronic configuration of Fluorine: [He] 2s²2p⁵.
2. The electronic configuration of Neon: [He]2s²2p⁶
3. The electronic configuration of Sulfur: 1s²2s²2p⁶3s²3p⁴
4. The electronic configuration of Calcium:[Ar] 4s²
5. The electronic configuration of Iron: [Ar] 3d⁶4s²
Hence, this is the required solution.
Which statement best describes the role of plate tectonics in changes that occur on Earth?
A: Convection currents in the mantle cause mountain ranges to slowly collapse over time.
B: The subduction of oceanic crust cools the mantle and prevents volcanic eruptions.
C: The movement of plates builds pressure that is released during an earthquake.
D: Seafloor spreading causes ocean basins to get smaller and shallower over time.
Answer:
the answer is A i learned this in class and i had the exact same question
Name the parts of a chemical reaction, and describe both
Explain:
(a) Ethanol should be rectified after distillation.
Answer:
Ethanol (boiling point 78°C) and methanol (boiling point 65°C) are two miscible liquids. There is only a small difference in their boiling points. These two liquids are separated from their mixture by fractional ths distillation.
When vapours of the mixture pass through the fractionating column, repeated liquefaction and vapourisation take place. Subsequently, the vapours of low boiling methanol enter the condenser from the fractionating column, condense to liquid and get collected in the round bottomed flask first. Similarly, ethanol with higher boiling point can be collected later in another round bottomed flask.
Pls help
Three gases are added to a single tan of the same size. The first gas is currently at 303.9kPa, the second at 1900tor and the third at 132.3PSI. To one
decimal place, what are the percentages for each gas of the total pressure in the tank?
Answer:
See Explanation
Explanation:
We must first convert the gas pressures to a common unit. I choose to convert all pressures to kiloPascal.
Since;
1 kilopascal = 7.501 torrs
X. =1900tor
X= 1900 × 1/7.501
X= 253.3 Kpa
Since 1 PSI =6.895 kilopascals
132.3PSI = 132.3 × 6.895/1
= 912.2 Kpa
Total pressure = 303.9kPa + 912.2 Kpa + 253.3 Kpa = 1468.8 kPa
For first gas;
303.9/1468.8 × 100 = 20.7%
For second gas;
912.2/1468.8 × 100 = 62.1%
For the third gas;
253.3/ 1468.8 × 100 = 17.2%
help please ? i’m being timed andnjdjd
Answer:
the last 2
Explanation:
pls mark me brainliest
(only reply if you know the answer or get reported) Please solve this ty
Answer:
7) 50 8)4
Explanation:
I answered the question what do you want to gave me
What is the correct order of coefficients to balance this equation?
20 points
_Al + _CuSO, → __AI (SO) + _Cu
2321
1231
O 1232
O 2313
Answer:
2Al + 3CuSO4 → Al2(SO4)3 + 3Cu
Explanation:
I THINK
WHAT IS OZONE.....................
How does it acts as safeguard?
Explanation:
The ozone layer is a natural layer of gas in the upper atmosphere that protects humans and other living things from harmful ultraviolet (UV) radiation from the sun. ... The ozone layer filters out most of the sun's harmful UV radiation and is therefore crucial to life on Earth.
What is a gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm?
To Find :
Gas’s temperature in Celsius when it has a volume of 25 L, 203 mol, 143.5 atm .
Solution :
We know, by ideal gas equation :
[tex]PV =nRT\\\\T = \dfrac{PV}{nR}[/tex]
Here, R is universal gas constant and [tex]R = 0.082 \ L \ atm \ mol^{-1} \ K^{1}[/tex]
Putting all given values and R in above equation, we get :
[tex]T = \dfrac{PV}{nR}\\\\T = \dfrac{143.5\times 25}{203 \times 0.082}\ K\\\\T = 215.52\ K[/tex]
Hence, this is the required solution.
True or False. The loads in a parallel circuit do not necessarily all have the same amount of current in them.
Answer:
TRUE
Explanation:
Which of these solutions has the highest vapor pressure at 25°C?
A. 0.10 Molar C6H1206
B. 0.10 Molar NaF
C. 0.10 Molar MgCl2
D. 0.10 Molar K3P04
Solution :
We know, In an electrolyte solution, the number of dissolved particles is larger because the solute breaks apart into ions. The greater the number of ions, the larger the impact on colligative properties will be.
So, the compound which will dissociate into more number of electrolyte has more vapour pressure.
Out of all given compound K₃PO₄ have highest number of particles after dissociation.
Hence, D) is the required solution.
Th following diagram is an example of a(n) [Hurry!!]
A. Covalent Bond
B. Ionic Bond
C. Metallic Bond
The following diagram is an example of a(n) [Hurry!!]
A. Covalent Bond ✓ answer
B. Ionic Bond
C. Metallic Bond
Answer:
This is the diagram of covalent bond
Lion on a clifs edge pounces onto a deer below and consumes it what are the three energy transformations
Answer:
Energy from the question above: is converted first from gravitational potential energy, to mechanical energy, then finally to chemical energy.
Gravitational potential energy— mechanical energy— chemical energy
Explanation:
The Lion on the clifs edge, is above the earth's surface, has its energy stored in the form of gravitational potential energy. Gravitational energy = mgh (m = mass, g = gravitational field, h = height). The lion pouncing on the deer now has mechanical energy which comprises the addition of the lion's potential energy and its kinetic energy. After consuming the deer, the energy is in chemical energy which is important to build molecules of glucose.
Scientists have observed that hurricanes are strongest over water, and that hurricanes lose momentum and become weak when they reach land. Which statement best explains this observation?
The ocean tides provide energy to hurricanes.
The ocean winds provide energy for hurricanes.
The warm water provides moisture for hurricanes.
The Coriolis Effect provides moisture for hurricanes.
Answer:
Explanation:
The warm water provides moisture for hurricanes so that hurricanes are strongest over water, and become weak when they reach land.
What is hurricane?Hurricanes are forceful winds in the air which are able to destroy even a land completely. One of the most destructive forces on earth is the hurricane. Although the process of a origin of hurricane is complex.
They need water that is at least 80 degrees first. Air that is wet is the second component. Finally, for a hurricane to form, there must be convergent winds.
A group of thunderstorms moving across the ocean's surface signal the start of the real process. Similar to how a straw absorbs liquid, when the surface water is heated, the storm absorbs heat energy from the water. The air becomes moistened as a result.
The storm can develop into a hurricane if the wind conditions are right. The fuel is this thermal energy. Hence, option c is correct.
To find more on hurricanes, refer here:
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Hi please help me with this chemistry question? thank you
Answer:
Aluminium fluoride is an ionic compound and the formation of the compound involves ionic bonding between positively-charged aluminium ions and negatively-charged fluoride ions.
Explanation:
Aluminium fluoride is an ionic compound and the formation of the compound involves ionic bonding between positively-charged aluminium ions and negatively-charged fluoride ions.
Ionic bonds are formed between two oppositely charged ions which are held together by strong electrostatic forces of attraction.
In the formation of aluminium fluoride, aluminium being a metal gives up its electrons to form the aluminium ion. Aluminium has three valence electrons which it gives up to the aluminium ion, Al³+. Fluorine, being a non-metal forms ions by accepting electrons to form the fluoride ion, F-. Fluorine has a valency of 1, hence, each fluorine atom can only accept one electron to form fluoride ions. Therefore, three fluorine atoms are required to accept the three electrons from an aluminium atoms.
With the formation of the aluminium and fluoride ions, the ions are then held together in the compound by the strong electrostatic forces of attrcation between the charges on the ions. Thus, the compound aluminium fluoride is formed.
How much heat does it take to turn water from -30 degreesC to 120 degreesC?
If you actually know the answer please tell me! ASAP!!!
Answer:
110 degrees C
Explanation:
110 degrees
is your answer
someone help me with this please
Is 22.99 mol of Na equal or not equal to Avogadro's number?
Answer:
It is not equal to Avogadro constant
Explanation:
This is because Avogadro constant refer to the number of molecules or atoms of particles per mile substance and thus is equal to 6.022×10^23 per mile or unit of that substance.
dont know how to do this one someone pls help?
Answer:
the answer is C There is simply more collisions
What is the percent yield for the reaction below when 544.5 g SO2 and 160.0 g O2 produce 382.0 g SO3? 2SO2(g) + O2(g) 2SO3(g) A. 56.1% B. 54.2% C. 23.9% D. 47.7%
Answer:
Option A.
Explanation:
Balanced equation is:
2SO₂ (g) + O₂(g) → 2SO₃(g)
First of all, we need to determine the limiting reagent. We convert mass to moles:
544.5 g . 1 mol / 64.06g = 8.5 moles of sulfur dioxide
160 g . 1mol / 32g = 5 moles of oxygen
Ratio is 1:2. 1 mol of oxygen needs 2 moles of sulfur dioxide
5 moles of oxygen may react to (5 . 2) /1 = 10 moles of SO₂
We only have 8.5 moles of SO₂ but we need 10 moles. In conclussion limiting reagent is SO₂.
Ratio is 2:2. 2 moles of SO₂ can prdouce 2 moles of SO₃
Then 8.5 moles of SO₂ must produce 3 moles of SO₃
We convert mass to moles, to determine the theoretical yield (100 % yield reaction) → 8.5 mol . 80.06 g /mol = 680.51 g
Formula for percent yield is: (Produced yield / Theoretical yield) . 100
(382 g / 680.51g) . 100 = 56.1 %
Which of the following accurately describes a Brønsted-Lowry acid?
A)
A Brønsted-Lowry acid receives a protein and has a matching conjugate acid.
B)
A Brønsted-Lowry acid donates a proton and has a matching conjugate base.
C)
A Brønsted-Lowry acid receives a proton and has a matching conjugate base.
D)
A Brønsted-Lowry acid donates a protein and has a matching conjugate acid.
Answer:
B. A Brønsted-Lowry acid donates a proton and has a matching conjugate base.
Explanation:
Here's HA is bronsted acid and its conjugate base pair is A-.
Answer:
Explanation:
The actual answer is B. The equation has an acid on one side and a base on the other. The acid donates a proton. Donates means gives up the equivalent of a proton.