it has to be b
Explanation:
bc the 4th power to 5 is 2
HELP PLSSS
Why is the water cycle important for ecosystems?
A. The water cycle helps plants keep and store water. The cycle makes sure that water stays at earth's surface and is available to ecosystems.
B. The water cycle photosynthesis to make clouds. These clouds make surface water that animals drink to survive in there ecosystem.
C. The water cycle permanently removes water from the underground and from large bodies of water and transports it to terrestrial ecosystems
D. The water cycle helps recycle and transport water around the planet. The cycle replenishes the water supply of ecosystems.
Answer:
The water cycle is often taught as a simple circular cycle of evaporation, condensation, and precipitation. Although this can be a useful ...
Explanation:
Answer: Your answer will be D)
Explanation: Hope this helped
If 10 grams of Na react with 15 grams of sodium to form sodium chloride, at the end of the chemical reaction, 2 grams of Na are left.
What is the limiting reactant? Explain your answer.
Answer:
the limiting reactant is the reactant that gets used up first, so the limiting reactant is Cl2
Circuit
1 The flow of electricity requires a
A open
B serial
C closed
D square
Answer:
the flow of electricity requires a closed circuit
Normal gastric juice has a pH of about 2. Assuming that normal gastric juice is primarily aqueous HCl, what is the concentration of HCl in the stomach?
With the normal gastric juice (a combination of H20, HCl, electrolytes, and other organic materials) at a pH of about 2, the concentration of HCl in the stomach is mathematically given as
HCl=10^{-2}m
What is the concentration of HCl in the stomach?Question parameter
Normal gastric juice has a pH of about 2.
Generally, the equation for the pH value is mathematically given as
Given pH=2
2=-log[H+]
H+=10^{-2}m
In conclusion, Hcl is a strong electrolyte
Hence
H+=[HCl]
HCl=10^{-2}
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How many molecules are there in 2.3 grams of NH4SO2?
Answer:
23 a NH₂SO₂ Imol NH 4S02 16.0281023 molec, NH4NO₂ = 11,7*1022 molec.
Explanation:
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Which statement is true according to the kinetic theory? A. Only gases show random motion of particles. B. Only gases and liquids show random motion of particles. C. Solids have a fixed shape, so they do not show random motion of particles. D. All states of matter show random motion of particles. Reset
Answer:
All states of matter show random motion of particles
Explanation:
In gases the particles are bonded very weakly so randomness is mostIn liquid it decreasesIn solid it's leastwhat is kinetic energy of a 155 kg object moving at speed of 20 m/s
Answer:
KE = 1/2*m*v^2
KE = 1/2*150kg*(20 m/s)^2
KE = 75kg * 400m²/s²
KE = 30,000 kg*m²/s²
KE = 30,000 N*m
KE = 30,000 J
Explanation:
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Sulfuric acid dissolves aluminum metal according to the reaction; 2Al(s) + 3H2SO4(aq) —-----> Al2(SO4)3(aq) + 3H2(g)
Suppose you want to dissolve an aluminum block with a mass of 15.2 g What minimum mass of H2SO4 (in g) do you need? What mass of H2 gas
(in g) does the complete reaction of the aluminum block produce?
Answer:
There!!
Explanation:
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what materials you would set out in a four-surface amalgam procedure?
Answer:
in the image below
Explanation:
Create a comic strip that follows the journey of energy from the sun as it travels through the humpback whale
The path of energy flow from the sun to the humpback whale is as follows:
Sun---> Plankton ---> Small fishes ---> Humpback whale. What is energy?Energy is the ability to do work.
The primary source of energy on the earth is the sun.
The energy from the sun is used by producers to produce food on which other organisms depend on.
The energy from the sun gets to the humpback whale through producers such as plankton.
The path of energy flow from the sun to the humpback whale is as follows:
Sun---> Plankton ---> Small fishes ---> Humpback whale.Learn more about energy flow at: https://brainly.com/question/21786633
can someone please help me with this question
Answer:
the difference between model A and model B is that model A has more molecules and they look smaller and are the same type while model B has less atoms and they are different types of atoms.
Explanation:
Suppose you add 25 grams of sucrose (table sugar) to a glass of water having a
volume of 110 mL. What is the weight by volume concentration of the sugar-
water? Please do not include any units in your answer.
The weight by volume of the prepared solution would be 22.73
Weight by volumeThe weight by volume of a solution is defined as the mass of the solute (in grams) per 100 mL of the solvent.
In this case, mass of solute = 25 grams
Volume of solvent = 110 mL
25 g is added to 110 mL
equivalent amount is 100 mL = 25 x 100/110
= 22.73 w/v
W/V concentration of the solution = 22.73
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The atomic number of an atom is equal to the number of protons electrons neutrons a.protons b.electrons c.neutrons
Answer:
A
Explanation:
Atomics number = number of protons
can you help me to solve these questions?
Answer:
No.2)answer
Explanation:
As elevation increases, atmospheric pressure decreases, causing water to boil at lower temperatures, which lengthens cooking times.A pressure cooker provides constant, precise atmospheric conditions inside the cooker, reducing cooking times even at high altitudes.
No.3 Answer
When something changes its state of matter (formally, a phase change), regardless of whatever it is, it remains at it's melting point/boiling point/freezing point UNTIL all of it has changed its state of matter.
When something changes its state of matter (formally, a phase change), regardless of whatever it is, it remains at it's melting point/boiling point/freezing point UNTIL all of it has changed its state of matter.So, to clear up, ice and water can both exist at 0°C at 1 atmosphere. The difference is that water has more energy than ice does, therefore solid water can break up the bonds and become a liquid.
When something changes its state of matter (formally, a phase change), regardless of whatever it is, it remains at it's melting point/boiling point/freezing point UNTIL all of it has changed its state of matter.So, to clear up, ice and water can both exist at 0°C at 1 atmosphere. The difference is that water has more energy than ice does, therefore solid water can break up the bonds and become a liquid.I heavily suggest you take a look at calorimetry, it explains it greatly and is related to your question.
Which of the following statements does NOT describe the alkali metals?
a.Most are shiny gray solids that are very soft.
b. They easily gain an electron to form ions with a charge of -1.
C. They are not found uncombined in nature.
d. They react with water to form alkaline solutions.
Answer:
B
Explanation:
They do not easily gain an electron to form ions with -1 charge.
Which product (if any) will form a precipitate in the following reaction?
3KOH(aq) + Fe(NO3)3(aq) --> Fe(OH)3 + 3KNO3
a)No Precipitate formed
b)KOH
c)KNO3
d)Fe(OH)3
Answer:
Your answer should be D. Fe(OH)3.
If you answer this please include the steps because I used to know how to do these problems really well I just forgot how.
Hydrogen sulfide gas, which smells like rotten eggs, burns in air to produce sulfur
dioxide and water. How many moles of oxygen gas would be needed to completely
burn 8 moles of hydrogen sulfide?
Answer:
12 moles of oxygen gas
Explanation:
2H₂S + 3O₂ => 2SO₂ + 2H₂O [balanced equation]For every 2 moles of hydrogen sulfide gas, 3 moles of oxygen is requiredTherefore, 8 moles of hydrogen sulfide requires 12 moles of oxygen gas12 moles of oxygen gas would be needed to completely burn 8 moles of hydrogen sulfide.
What is mole ratio of a reaction?The mole ratio of a reaction is a ratio showing the how moles of reactants combine to form products or the ratio of moles if products formed to the moles of reactants used up.
The balanced equation of the reaction is given below:
[tex]2H_{2}S + 3O_{2}\rightarrow 2H_{2}O + SO_{2}[/tex]
3 moles of oxygen reacts completely with 2 moles of hydrogen sulphide.
8 moles of hydrogen sulphide will require 3 × 8/2 moles of oxygen = 12 moles of oxygen.
Therefore, 12 moles of moles of oxygen gas would be needed to completely burn 8 moles of hydrogen sulfide.
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Tim's mom woke up with a stomach ache, so she dropped an antacid tablet in a cup of water and boiled another cup of water in the microwave to make tea. Both processes causes bubbles to form in water, but one is a physical change, while the other is a chemical change. Determine which change is physical, which is chemical, and why the two changes are different at the molecular level. PLEASE HELP I WILL GIVE 30 POINTS
Dropping an antacid tablet in a cup of water is a chemical change while boiling a cup of water for tea is just a physical change.
Physical versus chemical changePhysical changes have to do with the physical properties of substances. Such changes can be reversed.
Chemical changes, on the other hand, have to do with the chemical properties of substances and are usually irreversible when they occur.
Dropping an antacid in water with the formation of bubbles indicates that gas is evolved in the reaction. This means that a chemical reaction has occurred.
The bubble formed from boiling water is a result of increased entropy. Evaporated water can be retrieved by condensation.
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In an investigation, explain the best way to use variables in an experiment
Answer:
An experiment is an investigation in which a hypothesis is scientifically tested. In an experiment, an independent variable (the cause) is manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. An advantage is that experiments should be objective.
Explanation:
4Al + 3O2 → 2Al2O3
complete the statement to properly convert from moles of aluminum to moles of aluminum oxide. Use numbers as answers.
The proper conversion factor has how many
moles of aluminum oxide in the numerator and
moles of aluminum in the denominator.
Answer: Aluminum reacts with oxygen to produce aluminum oxide
Explanation:
The conversion factor for the given chemical equation is 2:4.
To convert from moles of aluminum to moles of aluminum oxide, we can use the balanced chemical equation: [tex]4 Al+ 3 O_2\rightarrow 2 Al_2O_3[/tex]
The coefficients in the balanced equation can be used as conversion factors. In this case, we want to find the ratio of moles of aluminum oxide to moles of aluminum.
From the balanced equation, we can see that:
- For every 4 moles of aluminum, we get 2 moles of aluminum oxide.
So, the proper conversion factor has 2 moles of aluminum oxide in the numerator and 4 moles of aluminum in the denominator.
Therefore, the conversion factor is:2 moles of aluminum oxide : 4 moles of aluminum.
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I attached the problem below.
Answer:
Step 1: CCl4 + 2(HF) --> CCl2F2 + 2(HCl)
Step 2: CCl2F2: 121 g/mol CCl4: 154 g/mol
Step 3: 25.1 g
Step 4: 50.6%
Explanation:
Step 1: Write a balanced equation
The unbalanced form of the equation is just what the problem tells you in the beginning: Freon is synthesized from CCl4 with HF. HCl is also made as a byproduct. This means that our equation will be:
CCl4 + HF --> CCl2F2 + HCl
This equation is clearly unbalanced, as there are different numbers of atoms on either side.
Starting Atoms:
(The arrow shows what is on either side of the reaction arrow)
C: 1 --> 1
Cl: 4 --> 3
H: 1 --> 1
F: 1 --> 2
Let's first try adding a coefficient of 2 to HCl.
Coefficient One:
C: 1 --> 1
Cl: 4 --> 4
H: 1 --> 2
F: 1 --> 2
However, now the H (as well as the F) are out of balance on the left side of the arrow. Luckily, putting a coefficient of 2 in front of HF balances the equation completely.
Coefficient Two:
C: 1 --> 1
Cl: 4 --> 4
H: 2 --> 2
F: 2 --> 2
This means that the balanced equation is:
CCl4 + 2(HF) --> CCl2F2 + 2(HCl)
Step 2: Calculate the Molar Masses
To find the molar masses, we simply add up all of the individual atomic masses.
CCl2F2: (12.0)+2(35.5)+2(19.0) = 121 g/mol
CCl4: (12.0)+4(35.5) = 154 g/mol
Step 3: Calculate the Theoretical Yield in Grams
We can now put together the previous steps. You typically need to figure out which molecule is the limiting reactant, but as they have only given you one initial mass, we can assume that CCl4 will be the LR. Essentially, the next step is to do several conversions to turn this reactant gram value into a product value. We will go from g of reactant to moles of reactant (using its molar mass), then to moles of product (with the balanced equation), and finally, to grams of product (using the other molar mass):
[tex]\frac{31.9g}{1} *\frac{1molCCl4}{154g} *\frac{1molproduct}{1molCCl4} *\frac{121g}{1molproduct}=25.1g[/tex]
This results in 25.1 g of product as our theoretical yield. This amount is the absolute maximum amount of product that could possibly be made from the amount of starting materials that we put in.
Step 4: Calculate the Percent Yield
This is probably the easiest step. All we have to do is use the following equation, and we will have our answer:
[tex](\frac{created}{expected})*100=yield[/tex]
The created value is what is given in the problem itself: 12.7 g
The expected amount is our theoretical yield value that we just calculated: 25.1 g
Substituting this into the equation, our percent yield is just over half at about 50.6%. Keep in mind that a yield of 100% is just about impossible due to human error, things being left on glassware, etc.
Was electricity flowing in the circuit,how did you know?
Just connect an ammeter with circuit.
If ammeter shows reading then current flows.If no reading is shown current doesn't flow.Write the acidic equilibrium equation for HNO₂
Answer:
h+(aq)+no−2(aq)⇌hno2(aq)2. hno2(aq)⇌h+(aq)+no−2(aq)3. hno2(aq)⇌h−(aq)+no+2(aq)4. hno2(aq)+h+(aq)⇌h2no+2(aq)5. hno2(aq)+h−(aq)⇌h2no+2(aq)b.
Explanation:
The acidic equilibrium equation for nitrous acid is shown as HNO₂ ⇄ H⁺ + NO₂⁻ in which acid is in equilibrium with its dissociate ions.
What is equilibrium state?Equilibrium state in any chemical reaction is that state in which concentration of reactant and products will attain constant value.
Acidic equilibrium equation for Nitrous acid (HNO₂) is shown as:
HNO₂ ⇄ H⁺ + NO₂⁻
From the above equation it is clear that in equilibrium state concentration of nitrous acid is in equilibrium with the H⁺ ion and NO₂⁻ ion.
Hence, HNO₂ ⇄ H⁺ + NO₂⁻ is the acidic equilibrium equation.
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What is the molar mass of an unknown gas with a density of 1.90g/L at 1.00 atm and 25.0 C?
Answer:
46.46 g/mol
Explanation:
dRT = PM
(1.90 g/L)(0.082057 L * atm/mol⁻¹ * K⁻¹)(298 K) = (1.00 atm)M
46.46 g/mol = M
Given the following equation: 2K + Cl2 --------> 2 KCl
Write two possible mole ratios.
Answer:
KCl/K
2KCl/Cl2
(not sure if that's what you're looking for)
Priya brought a solid chocolate bar to school to eat as a snack in the afternoon. She left it in her pocket for a few hours. When she took out the chocolate bar to eat it, the bar was was no longer solid. Which description best describes the current state of the chocolate?
A
The chocolate is now made up of particles packed closely together, having both definite shape and definite volume.
B
The chocolate is now made up of particles packed relatively close together, having an indefinite shape but a definite volume.
C
The chocolate is now made up of particles that are far apart from each other, having both indefinite shape and indefinite volume.
D
The chocolate is now made up of positively charged particles and negatively charged electrons, having indefinite shape and indefinite volume.
Answer: The chocolate has melted, which means it has turn from a solid to a liquid. A liquid has a definite volume but an indefinite shape. Therefore, the correct answer is B.
Priya brought a solid chocolate bar to school to eat as a snack in the afternoon. She left it in her pocket for a few hours. When she took out the chocolate bar to eat it, the bar was was no longer solid. The description that best describes the current state of the chocolate is "The chocolate is now made up of particles packed relatively close together, having an indefinite shape but a definite volume".
What is Liquid state?There are basically 3 states of matter - Solids, Liquids and gases.
Solid is having definite shape and definite volume, Liquid is having indefinite shape and definite volume and gas is having indefinite shape and indefinite volume.
Liquid and gas states are fluids that can flow easily and their particles are far away from each other.
Water is a liquid, Hydrogen and Oxygen are gases, Ice is a solid.
Given is that Priya left chocolate in her pocket for a few hours. When she took out the chocolate bar to eat it, the bar was was no longer solid.
Therefore, When she took out the chocolate bar to eat it, the bar was was no longer solid. The description that best describes the current state of the chocolate is "The chocolate is now made up of particles packed relatively close together, having an indefinite shape but a definite volume".
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Some people have two eggs for breakfast. Which of these causes a chemical change to the eggs?
A. Cooking the eggs
B. Breaking the eggs
C. Stirring the raw eggs together
D. Putting salt and pepper on the eggs
Answer:
the answer is A. cooking the eggs
Answer:
A. Cooking the eggs
Explanation:
Cooking the eggs is a chemical change because it's a permanent change. There's no way to get the eggs back in its original form as an egg. Breaking the egg, stirring the egg, or even putting spices on the eggs are all examples of physical changes because they don't change the eggs' chemical composition. They only change its appearance.
How many grams are in 6.04 x 10 22 particles of AICI3
Answer:
333.415 grams
Explanation:
If you multiply and do a few calculations, this is the answer :)
333.415 grams
Your general equation is Al + 3Cl -> AlCl3
A mole of Aluminum weighs 26.98 grams.
26.98 x 2.5 = 67.45 (so that is the weight of the aluminum in your AlCl3 compound.
Now lets add the weight of the Cl.
the molar mass of chlorine is 35.45 grams/mole.
Please see the file and help me.
Giving Brainliest to the first correct answer!
Answer:
iam pretty sure it's 3, since the water boils from the bunsen burner
Answer:
Answer No. 3
Explanation:
Boiling liquids as they can become flammable.
The following statements are about elements in the Periodic Table.
1 Their atoms have a full outer shell of electrons.
2 They are unstable .
3 They are found in Group
4 They are present in small quantities in the air.
Which statements are correct for the noble gases? *
A) 1, 2 and 3
B) 1, 2 and 4
C) 1,3 and 4
D) 2, 3 and 4
Answer:
D) 2,3 and 4
Option A is not correct because not all elements in the periodic table have a full outer shell of electrons