Answer:
Buffers are solutions that resist changes in pH, upon addition of small amounts of acid or base. The can do this because they contain an acidic component, HA, to neutralize OH- ions, and a basic component, A-, to neutralize H+ ions. Since Ka is a constant, the [H+] will depend directly on the ratio of [HA]/[A-].
hope it's help
#carryONlearningthis woman is riding a bicycle down a hill at a constant speed and in a straight line.
Which change will increase the speed of the bicycle?
A. Added forces of 30 N up the hill and 20 N down the hill
B. Added forces of 30 N up the hill and 30 N down the hill
C. An added force of 20 N down the hill
D. An added force of 20 N to the side of the hill
Answer:
what is your zoom email
teĺlllll
What is the formula for Silver (I) chloride?
Answer:
AgCl formula for silver(l) chloride
What would be an inference you could make about this cat?
Answer:
pickles are ligit good
Explanation:
i like pickles but not his
Which statement describes an interaction between the biosphere and the atmosphere that is related to
photosynthesis?
• During photosynthesis, plant roots take in water from soil.
O During photosynthesis, plants take in carbon dioxide from the air.
O Through photosynthesis, energy stored in plants is released into the air.
O Through photosynthesis, energy stored in plants is transferred to humans who eat them
Answer:
O During photosynthesis, plants take in carbon dioxide from the air.
Answer: The answer is: During photosynthesis, plants take in carbon dioxide from the air.
Explanation: I have my ways ;>
How many moles are there in 1.20 x 1025 particles of helium?
Answer:
You would get 19.969 moles.
Explanation:
You would get 19.969 moles.
What happens to the chemical energy in methane's bonds
when methane reacts with oxygen and forms H20 and CO,?
Answer: chemical energy is converted to heat and light energy
Explanation: exothermic reaction
4CH3+7O2–>6 H2O+4CO2+energy
Explain why Thorium-229 is radioactive
Answer:
Thorium-229 is a very insoluble metal that emits radioactive alpha particles. It is generated by the decay of uranium-233 and has a half-life of 7.340 years.
Explanation:
braliyest please
Can someone help me over here? I need an negative charge and also another thing is that in a question it asked me to use something that would represent an ion. I’m not sure on what to choose either Hydrogen or Helium but just please send help.
Answer:
You could use a hydrogen anion which has 2 electrons.
Explanation:
An ion is an atom or molecule with a net electric charge because it has more or less electrons compared to the original atom or molecule.
An anion is a negatively charged ion.
A cation is a positively charged ion.
Normally a hydrogen atom has one proton and one electron.
So a hydrogen anion (H-) means that it has one proton and two electrons, which means the positive charge will be +1 and the negative charge will be -2.
Ultimately, giving the entire molecule a net charge of -1 because -2+1 = -1.
(I hope this helps! I am not 100% sure what's the format of this question. Like is it interactive? online? Did you draw all those electrons on the diagram? or were they given? Are the numbers given as well? or did you type those in? So I just tried my best to give you something that might work.)
Which of the following is the best example of kinetic energy being transformed into potential energy?
A. water flowing into lake behind a dam
B. an avalanche sliding down a mountainside
C. wind pushing a sailboat through the water
D. a motorboat pulling a water skier across a lake
WHICH ONE IS IT?!
Answer:
The correct answer is A
Explanation:
That water stops moving once it gets to the dam and turns into potential energy
How much water has to be evacuated from 250ml of 1M Ca(OH)2 to make it 3M
Answer:
ERROR
Explanation:
Answer could not be show due to technical difficulties
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. The volume of 3M diluted solution of calcium hydroxide is 83.3ml.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
According to the neutralization law,
M₁V₁=M₂V₂
where,
M₁ = molarity of stock solution = 1 M
V₁ = volume of stock solution = 250ml
M₂ = molarity of dilute solution =3M
V₂ = volume of dilute solution = ?
substituting all the given values we get
M₁V₁=M₂V₂
1 M×250ml=3M×V₂
V₂=83.3ml
Therefore, volume of 3M diluted solution of calcium hydroxide is 83.3ml.
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Can someone please help me with this question?
es 3l por 0/0 (1234008×556098
someone please help!! I need an answer by 10:20
“I used to think _____________ about electricity, and now I think….”
Im in 7th grade btw
100 points!!!
Answer:
"I used to think a lot about electricity, and now I think..."
or a synonym of it.
Explanation:
A chemist prepares a solution of silver(I) perchlorate by measuring out of silver(I) perchlorate into a volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's silver(I) perchlorate solution. Be sure your answer has the correct number of significant digits.
The question is incomplete, the complete question is;
A chemist prepares a solution of silver (I) perchlorate (AgCIO4) by measuring out 134.g of silver (I) perchlorate into a 50.ml volumetric flask and filling the flask to the mark with water. calculate the concentration in mol/L of the silver (I) perchlorate solution. Round your answer to 2 significant digits.
Answer:
13 mol/L
Explanation:
We must first obtain the number of moles of silver I perchlorate involved
Molar mass of silver I perchlorate = 207.32 g/mol
Number of moles of silver I perchlorate = 134g/207.32 g/mol = 0.646 moles
Recall that;
n =CV
C= concentration
V= volume
n = number of moles
C = n/V
C = 0.646 moles * 1000/50
C = 13 mol/L
Which statement explains whether NaCl or BeO will have a stronger bond?
a
BeO will have a stronger bond because it has a larger ionic charge, and a smaller distance between ions.
b
NaCl will have a stronger bond because it has a smaller ionic charge, and a larger distance between ions.
c
NaCl will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions.
d
BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions.
Answer:
C
Explanation:
The statement that explains whether NaCl or BeO will have a stronger bond is D. BeO will have a stronger bond because it has a smaller ionic charge, and a smaller distance between ions
A chemical bond simply means the attraction between ions, atoms, or molecules which then leads to the formation of chemical compounds.
It should be noted that Beryllium oxide with the chemical formula BeO has a stronger bond than Sodium Chloride due to the fact that it has a smaller ionic charge, and a smaller distance between ions
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how does bases taste?
Answer:
bases taste bitter, feel slippery, and conduct electricity when dissolved in water
Explanation:
Answer:
like peas
Explanation:
look at the four chemical reactions
reaction 1:4Na + O ▾ 2 -->2Na ▾ 2O
Reaction 2: 2NaCl—> 2Na+Cl ▾2
reaction 3: CaCO ▾3 —> CaO +CO ▾2
reaction 4: 2KCIO3 ▾3 —> 2KCI + 3O ▾2
which statement identifies the reaction that is different from the rest and explains correctly why it is different?
A.) Reaction 2, because two ions are interchanged
B.) Reaction 2, because two products are formed
C.) Reaction 1, because a single product is formed
D.) Reaction 1, because a single ion is replaced in a compound
Reaction 1 is the one that is different because there is only one product (option C).
In a reaction, there are two main components:
The reactants: Substances at the beginning of the reaction.The products: Substances at the end of the reaction.Moreover, a reaction can include two or more reactants as well as two or more products depending on the substances involved. Let's analyze reaction 1:
Reaction 1: 4Na + O2 → 2Na2OReactants: 4Na and O2Product: 2Na2OThis means in this reaction there is only one product. This does not occur in reactions 2, 3, and 4 because in these there are two products.
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How do we determine climate?
a
I have no idea
b
Precipitation and weather
c
Temperature and weather
d
Precipitation and temperature
Answer:
D but I’m traitor figure out y my question is precipitation helps determine climate by. Weathe. My options are The interaction of the prevailing winds upon land or oceans. The development of local storms. The passage of weather fronts. All of the above
Explanation:
6.00 moles of sodium perchlorate contains the same number of atoms as __________. 6.00 moles of sodium perchlorate contains the same number of atoms as __________. 6.00 moles of sodium permanganate 6.00 moles of strontium oxide 6.00 moles of sodium cyanide 6.00 moles of lithium phosphate 6.00 moles of sodium nitrite
Answer:
6.00 moles of sodium permanganate
Explanation:
Let us attempt to count the number of atoms present in sodium perchlorate. The formula of the compound is NaClO4
Sodium atoms - 1
Chlorine atoms - 1
Oxygen atoms -4
Total number of atoms = 6
Among the options, only KMnO4 also has six atoms. One atom of potassium, one atom of manganese and four atoms of oxygen.
6.00 moles of sodium perchlorate contains the same number of atoms as: A. 6.00 moles of sodium permanganate.
How to calculate the number of atoms.First of all, we would determine the chemical formula and the number of atoms contained in each chemical compound as follows:
For sodium perchlorate:
Sodium perchlorate = [tex]NaClO_4[/tex]
[tex]NaClO_4[/tex] = [tex]1+1+2[/tex] = 6 atoms.
For sodium permanganate:
Sodium permanganate = [tex]KMnO_4[/tex]
[tex]KMnO_4[/tex] = [tex]1+1+2[/tex] = 6 atoms.
For strontium oxide:
Strontium oxide = [tex]SrO[/tex]
[tex]SrO[/tex] = [tex]1+1[/tex] = 2 atoms.
In conclusion, we can deduce that 6.00 moles of sodium perchlorate contains the same number of atoms as 6.00 moles of sodium permanganate.
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A 57 g g sample of iron reacts with 24 g g of oxygen to form how many grams of iron oxide?
A 57 grams sample of iron reacts with 24 grams of oxygen to form 81 grams of iron oxide.
What is iron oxide?
Iron oxide is a chemical compound that is made by the addition of iron and oxygen can also be known as ferrous oxide if react with two oxygen molecules then ferric oxide.
In the sample, the iron is 57 grams and the oxygen is 24 grams,
Fe + O -------------> FeO
Iron oxygen iron oxide
By adding the mass of iron and oxygen,
57 + 24 = 81 grams of iron oxide.
Therefore, the mass of iron oxide is 81 grams if 57 grams sample of iron reacts with 24 grams of oxygen.
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What mass will 7.29 moles of CO2 gas contain?
Answer:
[tex]320.8329\ \text{g}[/tex]
Explanation:
[tex]n[/tex] = Moles of [tex]CO_2[/tex] = [tex]7.29\ \text{moles}[/tex]
[tex]M[/tex] = Molar mass of [tex]CO_2[/tex] = [tex]44.01\ \text{g/mol}[/tex]
Mass is given by
[tex]m=nM[/tex]
[tex]\Rightarrow m=7.29\times 44.01[/tex]
[tex]\Rightarrow m=320.8329\ \text{g}[/tex]
The mass of the [tex]CO_2[/tex] gas will be [tex]320.8329\ \text{g}[/tex].
Please help asap, brainliest to correct answer!!!!
Which of the following statements best defines the actual yield of a reaction?
Select one:
a. The amount of product measured after a reaction
b. The ratio of measured yield over theoretical yield
c. The ratio of measured yield over stoichiometric yield
Answer: A) The amount of product measured after a reaction
A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct
What is yield of any reaction?Yield of any chemical reaction gives idea about the amount of product that is produced by the chemical reaction between reactants.
Actual yield gives idea about the how much yield of any product will be produced in the given chemical reaction by using the stoichiometry of the reaction.
Therefore, A statement which best defines the actual yield of a reaction is "The amount of product measured after a reaction" Hence, Option (A) is correct
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 how are subscripts determine the formula of ionic and covalent compounds ?
Answer:
To determine the correct subscripts in a chemical formula, you have to solve how many atoms you need to balance the charge.
For example if I had the compound Calcium Fluoride I would look at the periodic table and see that Calcium's ionic formula is
Ca2+
. How do I know this? Well all elements want to have 8 valance electrons so they can be stable(happy). Seeing that Calcium has 2 valance electrons it is going to give away 2 electrons because that is easier than gaining 6 to be happy. Since Calcium has given away 2 electrons it has two more protons than electrons. We know that Protons have a Positive charge, Electrons have Negative charge, and the number of electrons is equal to the atomic number of an element in its pure non-ionic state. (Meaning it doesn't have a positive or negative charge; it is balanced.)
So if calcium gave away two electrons, it will have two more protons than an electron giving it a (2+) charge. The same process can be applied to Fluoride. Since fluoride is one to the left of the noble gases(group 18 or 8A) on the periodic table we know that it has 7 valance electrons because it is in group 7A or 17.
Knowing that we have 7 electrons the fluoride atom will gain an extra electron. Since the fluoride atom gained an extra electron it will have one more negative charge than a positive making it a ^(−)ion.
So you know that Calcium has a 2+ charge and that fluoride has a 1- charge, you then need these ions to balance out. So you need two fluorine atoms with a 1- ions to balance out the 2+ ion of calcium. Your final answer would be
CaF2
because you need two fluorine atoms to balance out the 2+ charge of the calcium.
Final Tip: Determine the charges then inverse the charges, remove the positive and negative superscipts, and write the charge numbers as a sub script. Ie. Calcium Fluoride
Ca2+ and F−
inversing and removing the charge signs would give you
How do most animals produce offspring
Answer:
Some animals produce offspring through asexual reproduction while other animals produce offspring through sexual reproduction. Both methods have advantages and disadvantages. Asexual reproduction produces offspring that are genetically identical to the parent because the offspring are all clones of the original parent.
Explanation:
why are oxidation numbers assigned to the elements before writing a chemical formula
Answer:
Oxidation numbers assign ownership of the electrons to one atom or another in a compound. ... Scientists use these numbers to help name compounds, write formulas and balance chemical equations. They are also useful when studying reactions and they can help you identify when something is oxidized or reduced.
how is gas different from a liquid and a solid
a. a gas is mad of tiny particles
b. a gas has volume
c. a gas expands to fill the container
d. a gas has density
Answer:
a. a gas is mad of tiny particles
Explanation:
I believe
List 3 metals that could replace lead in the compound Pb(NO3)2 in a single replacement reaction.
Answer:
AKWIJKNZQSOKQPALQALQPALALQLLKILILI
why is eating fruits and vegetables always included in the lists of prevention for malnutrition and micronutrients deficiencies
The type of neuron that carries impulses from the brain are...
How many protons, electrons and neutrons does carbon have?
Answer:
6 all hope it helps thanks
30. The density of an unknown gas at 27°C and 2 atm pressure is equal with density of N2 gas at
52°C and at 5 atm
pressure. Calculate the molar mass of that unknown gas.
pls help guys
Answer:
Molar mass of the unknown gas is 64.6 g/mol
Explanation:
Let's think this excersise with the Ideal Gases Law.
We start from the N₂. At STP conditions we know that 1 mol of anything occupies 22.4L.
We apply: P . V = n . R . T
5 atm . V = 1 mol . 0.082 . 325K
V = (1 mol . 0.082 . 325K) / 5 atm = 5.33 L
It is reasonable to say that, if we have more pressure, we may have less volume.
As this is the volume for 1 mol of N₂, our mass is 28 g. Then, the density of the nitrogen and the unknown gas is 28 g/5.33L = 5.25 g/L
Our unknown gas has, this density at 27°C and 2 atm.
If we star from this, again: 1 mol of any gas occupy 22.4L at STP, we can calculate the volume for 1 mol at those conditions:
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
1 atm . 22,4L / 273K = 2 atm . V₂ / 300K
Remember that the value for T° is Absolute (T°C + 273)
[ (1 atm . 22.4L / 273K) . 300K] / 2 atm = V₂ → 12.3L
This is the volume for 1 mol of the unknown gas at 2 atm and 27°C
We use density to determine the mass: 12.3 L . 5.25 g/L = 64.6 g
That's the molar mass: 64.6 g/mol