Answer:
I believe it is C?
Sorry fi it doesn't help!
Given a 0.5 M stock solution of aqueous NaCl, how much of the stock solution would you need to make a 50 mL sample of 0.25 M aqueous NaCl solution? How much water would you need to add to the NaCl solution?
Answer:
25 ml of stock
Explanation:
Molarity x Volume of Concentrated Stock = Molarity x Volume of Diluted Stock
=> Mc x Vc = Md x Vd => (0.5M)(x) = (0.25M)(50 ml)
=> x = Vc = (0.25M x 50 ml) / (0.50M) = 25 ml of stock
Which measurement occurs last when collecting data to determine the
percentage by mass of a solution?
mass percent = (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100. The formula for a solution is:
mass percent = (grams of solute / grams of solute plus solvent) x 100. or.
mass percent = (grams of solute / grams of solution) x 100. The final answer is given as %.
Hope this helps!!
Which of the following is a job that bones do?
a.provide the body with shape and protection
b.store minerals
c.produce supply of daily blood cells
d.all of the above
Answer:
a.Provide the body which shape and protection.
Explanation:
Bones usually gives us shape as well as protects our innner organs.
so if it helps don't forget to like and Mark me
3. Given the following equation:
2 K+ Cl2 --->2 KCI
How many grams of KCl are produced from 2.50 g of K and excess Cl2?
show work.
Answer:
4.767 grams of KCl are produced from 2.50 g of K and excess Cl2
Explanation:
The balanced equation is
2 K+ Cl2 --->2 KCI
Here the limiting agent is K. Hence, the amount of KCl will be calculated as per the mass of 2.50 gram of K
Mass of one atom/mole of potassium is 39.098 grams
Number of moles is 2.5 grams = [tex]\frac{2.5}{39.098} = 0.064[/tex]
So, 2 moles of K produces 2 moles of KCL
0.064 moles of K will produces 0.064 moles of KCl
Mass of one molecule of KCl is 74.5513 g/mol
Mass of 0.064 moles of KCl is 4.767 grams
The mass of KCl produced is 4.77g
StoichiometryFrom the question, we are to determine the mass of KCl produced
From the given balanced chemical equation,
2K + Cl₂ → 2KCl
This means,
2 moles of potassium reacts with 1 mole of Chlorine to produce 2 moles of potassium chloride
First, we will determine the number of moles of potassium (K) present.
Using the formula,
[tex]Number\ of \ moles = \frac{Mass }{Atomic\ mass}[/tex]
Atomic mass of K = 39.098 g/mol
Then,
Number of moles of K present = [tex]\frac{2.50}{39.098}[/tex]
Number of moles of K present = 0.06394 mole
Now,
If 2 moles of K reacts to produce 2 moles of KCl
Then,
0.06394 moles of K reacts to produce 0.06394 moles of KCl
Thus, the number of moles of KCl produced is 0.06394.
Now, for the mass of KCl produced
From the formula,
Mass = Number of moles × Molar mass
Molar mass of KCl = 74.5513 g/mol
Then,
Mass of KCl produced = 0.06394 × 74.5513
Mass of KCl produced = 4.7668 g
Mass of KCl produced = 4.77 g
Hence, the mass of KCl produced is 4.77g
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If a dog has a mass of 21.5 kg, what is its mass in the following units? Use scientific notation in all of your answers.
What is the dog’s mass in grams?
What is the dog’s mass in milligrams?
What is the dog’s mass in micrograms?
Explanation:
use the conversation in the image
Franklin was performing an experiment by combining hydrochloric acid and sodium hydroxide. He measured the mass of his reactant materials to be 35g. The reaction resulted in the production of salt and water. He reported that his products weighed 32g. Which best describes the results of Franklin’s experiment? No error occurred, some of the products are always lost as heat. An error occurred, the mass of the reactants should equal the mass of the products. An error occurred, the products should weigh more than the reactants. No error occurred, water is not weighed when determining the weight of the products.
Answer:
B) an error occurred, the mass of the reactants should equal the mass of the products.
Explanation:
The answer choices are:
A) no error occurred, some of the products are always lost as heat.
B) an error occurred, the mass of the reactants should equal the mass of the products.
C) an error occurred, the products should weigh more than the reactants.
D) no error occurred, water is not weighed when determining the weight of the products.
SolutionThe basis to answer this question is the law of conservation of mass.
Any chemical reaction satisfies the law of conservation of mass: mass cannot be either created nor destroyed, so, always, the mass of the reactants equal the mass of the products.
Thus, since he measured the mass of his reactant materials to be 35g and he reported that his products weighed 32g, his data are in clear contradiction of the law of conservation of mass. So, there is an error in his results: the mass of the reactants should equal the mass of the products.
An error occurred, the mass of the reactants should equal the mass of the products according to law of conservation of mass for the given experiment. Therefore, the correct option is option B.
The mass of the reactants and products in a chemical reaction should be equal, in accordance with the law of conservation of mass. This implies that there is no net change in mass during the chemical process. The mass of the reactants and products in a chemical reaction should be equal, in accordance with the law of conservation of mass. This implies that there is no net change in mass during the chemical process.
Franklin determined the mass of the reactant components in this instance to be 35g, and the products of the reaction weighed 32g. An error occurred because the mass of the reactants should equal the mass of the products, but the mass of the products is less than the mass of the reactants.
Therefore, the correct option is option B.
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Please could you help me with this question
(No links or spam)
Will give brainliest if correct
Answer:
first one pure
second one mixture..
Which of these actions increases enthalpy in the air molecules of the Earth's
atmosphere?
A. The air being heated by the sun
B. Trees being planted in the rain forests
C. Carbon dioxide being taken in by plants during photosynthesis
D. People breathing in oxygen
HELP PLS
Answer:
The air being heated by the sun
Explanation:
Just took the quiz
Answer:
The answer is A (the air being heated by the sun)
Explanation:
A P E X
Obsidian _____.
is formed from sand and quartz
cools very quickly
has large mineral crystals
cools very slowly
Answer:
Cools Very Quickly
Explanation:
This is the right answer!
Which of the below is not a characteristic of a liquid?
Has a definite volume
Particles are spread far apart
Particles move at a medium speed
Takes the shape of its container
Which of the following molecules has a bent shape?
O A. CO2
O B. H20
O C. BeCl2
O D. NH3
How many moles of water are produced from the reaction of 0.224 mol oxygen according to this equation? 2H2 + O2 -> 2H2O
Answer:
0.448 mols
Explanation:
Use balanced equation:
2H2 + O2 -> 2H2O
For every one mole of oxygen, there are two moles of water
hence the molar ratio 1:2
So if there are 0.224 mols of oxygen
Water = 0.224×2
Which is 0.448 mols of H20
1. When there is light, photosynthesis can
A. occur, in the chloroplast.
B. not occur, and the stomata will not be open.
C. not occur, and the stomata will be open.
D. occur, in the
mitochondria.
Answer:
A
Explanation:
Answer:
A. occur, in the chloroplast.
Explanation:
Photosynthesis occur in chloroplasts, with the help of sunlight. Where mitochondria help in respiration
I need help
Balance the chemical equation
Answer:
Iwill add 2 for Na and 2 for NaCl so the answer is "C"
Which overall chemical equation is obtained by combining these intermediate equations?
How do humans influence genetic outcomes in artificial selection and what impacts does this have on society?
Answer:
In artificial selection, humans have the capacity to influence certain characteristics of organisms by selective breeding. One can choose desired parental traits determined by genes, which are then passed on to offspring.
a shape with five sides is called a?
Answer:
A five-sided shape is called a pentagon.
Explanation:
Answered by NONE other than the ONE & ONLY #QUEEN herself aka #DRIPPQUEENMO!!!
Hope this helped!!!
Answer:
a pentagon
Explanation:
I remember that a pentagon has 5 sides
what type of chart is used to help organize study and predict genetic inheritance?
Answer:
Its a punnet square
Explanation:
Metals are cunductor of heat and electricity prove this statement
Answer:Metals are an excellent conductor of electricity and heat because the atoms in the metals form a matrix through which outer electrons can move freely. Instead of orbiting their respective atoms, they form a sea of electrons that surround the positive nuclei of the interacting metal ions.
Explanation:
What is the name of the structure formed when fertilization occurs?
Answer:
zygote
Explanation:
I got this online
Answer:
ᘔYᘜOTᗴ:=> In human fertilization, a released ovum (a haploid secondary oocyte with replicate chromosome copies) and a haploid sperm cell (male gamete)—combine to form a single 2n diploid cell called the zygote.
ʰᵒᵖᵉ ⁱᵗ ʰᵉˡᵖˢ
[tex] \infty \infty [/tex]
if energy cannot be created then how did it exist in the first place???
Answer:
Different types of generators are used to create energy. Electrical energy is caused by moving electric charges called electrons. Electricity is a type of energy that comes from electrical energy. ... In power stations, turbines are turned using energy from sources such as heat, wind and moving water.
Explanation:
What is the molarity of a solution created by adding 0.75 moles of lithium fluoride to 65 L of solution?
Answer:
Molarity=Moles of solute/volume of solution in Litres
Simply imputing your values
you have
0.75/65
0.0115M.
What is the molarity (molar concentration, unit = M) of K+ found in 200 mL 0.2 M K2HPO4 solution?
Answer:
0.4 M
Explanation:
The process that takes place in an aqueous K₂HPO₄ solution is:
K₂HPO₄ → 2K⁺ + HPO₄⁻²First we calculate how many K₂HPO₄ moles are there in 200 mL of a 0.2 M solution:
200 mL * 0.2 M = 40 mmol K₂HPO₄Then we convert K₂HPO₄ moles into K⁺ moles, using the stoichiometric coefficients of the reaction above:
40 mmol K₂HPO₄ * [tex]\frac{2mmolK^+}{1mmolK_2HPO_4}[/tex] = 80 mmol K⁺Finally we divide the number of K⁺ moles by the volume, to calculate the molarity:
80 mmol K⁺ / 200 mL = 0.4 MWhat is the balanced molecular equation and balanced chemical equation for NaSO4 and KNO3?
Answer:
=KSO4+Na2(NO3)2
Explanation:
the answer is true using this chemical equation balancer
Muscles and bones work together when muscles move bones through contracting and
relaxing.
A.true
B.false
I think it's true.
Explanation:
Muscles move bones through contracting and relaxing
what is a chemical bond?
how ate chemical bond different from each other?.
Draw the major organic product formed in the reaction. (The reaction stoichiometry is 1 mol reactant: 1 mol Br2 .)
Answer:
Explanation:
The treatment of aldehyde or ketone in the presence of acetic acid with one mole of bromine results in ∝-halo aldehyde or ketone. However, the bromination of ketone undergoes acidic conditions. Hence, the reaction of the ketone with Bromine resulting in the Major Product is shown in the image attached below.
. How many grams of lithium are formed from the reaction if you begin with 89.5
grams of copper?
Cu
+
Li2S --> 2 Li +
CUS
Answer:
179g
Explanation:
Molar ratio for Copper : Lithium is
1:2
If there are 89.5g of copper
Grams for Lithium= 89.5 × 2 = 179g of Lithium
The amount of lithium are formed from the reaction if you begin with 89.5 grams of copper is 19.6 grams.
How do we convert mass into moles?Mass can be converted into moles by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 89.5g of copper = 89.5g / 63.5g/mol = 1.4 mol
Given chemical reaction is:
Cu + Li₂S → 2Li + CuS
From the stoichiometry of the reaction, it is clear that
1.4 mole of Cu = produces 1.4 mole of CuS
1.4 mole of CuS = produced by 1.4 mole of Li₂S
1.4 mole of Li₂S = produces 2×1.4=2.8 moles of Li
Mass of 2.8 moles of Li = (2.8mol)(7g/mol) = 19.6g
Hence resultant mass of lithium is 19.6g.
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Help asap pls! Circulating air caused when warm air rises and cool air sinks. Convection currents occur throughout the world.
1.barrage 2.collection area 3.convection current
3. Convection Current
But just a tip Next time try to emphasize the question a little more ! Hope this helps :)
Be sure to answer all parts.
Find the pH during the titration of 20.00 mL of 0.1000 M triethylamine, (CH3CH2)3N (Kb = 5.2 × 10−4), with 0.1000 M HCl solution after the following additions of titrant.
20.20 mL:
pH =
a.
Initial moles of (CH₃CH₂)₃N = (0.1000 mol/L) × (20.00/1000 L) = 0.002 mol
Moles of HCl added = (0.1000 mol/L) × (13.00/1000 L) = 0.0013 mol
Addition of 1 mole of HCl reacts with 1 mole of (CH₃CH₂)₃N to 1 mole of (CH₃CH₂)₃NH⁺.
After addition of 13.00 mL of HCl:
Moles of (CH₃CH₂)₃N left unreacted = (0.002 - 0.0013) mol = 0.0007 mol
Moles of (CH₃CH₂)₃NH⁺ produced = 0.0013 mol
Hence, [(CH₃CH₂)₃NH⁺]/[(CH₃CH₂)₃N] = 0.0013/0.0007 = 13/7
Consider the dissociation of (CH₃CH₂)₃N:
(CH₃CH₂)₃N(aq) + H₂O(l) ⇌ (CH₃CH₂)₃NH⁺(aq) + OH⁻(aq) …… Kb = 5.2 × 10⁻⁴
Henderson-Hasselbalch equation:
pOH = pKb + log([(CH₃CH₂)₃NH⁺]/[(CH₃CH₂)₃N])
pOH = -log(5.2 × 10⁻⁴) + log(13/7) = 3.55
pH = pKw - pOH = 14.00 - 3.55 = 10.45
====
b.
Initial moles of (CH₃CH₂)₃N = 0.002 mol
Moles of HCl added = (0.1000 mol/L) × (20.80/1000 L) = 0.00208 mol
HCl is in excess.
Moles of HCl left unreacted = (0.00208 - 0.002) mol = 0.00008 mol
Volume of the final solution = (20.00 + 20.80) mL = 40.8 mL = 0.0408 L
In the final solution:
[H₃O⁺] = [HCl] = (0.00008 mol) / (0.0408 L) = 0.00196
pH = -log[H₃O⁺] = -log(0.00196) = 2.71
====
c.
Initial moles of (CH₃CH₂)₃N = 0.002 mol
Moles of HCl added = (0.1000 mol/L) × (29.00/1000 L) = 0.0029 mol
HCl is in excess.
Moles of HCl left unreacted = (0.0029 - 0.002) mol = 0.0009 mol
Volume of the final solution = (20.00 + 29.00) mL = 49 mL = 0.049 L
In the final solution:
[H₃O⁺] = [HCl] = (0.0009 mol) / (0.049 L) = 0.0184
pH = -log[H₃O⁺] = -log(0.0184) = 1.74