Answer:
B. Anions are formed when an atom loses electrons.
The statement about ions that is not correct would be B. Anions are formed when an atom loses electrons.
Why is this false ?Anions are formed when an atom gains electrons. This means that they have more electrons than protons, giving them a negative charge. Cations are formed when an atom loses electrons. This means that they have fewer electrons than protons, giving them a positive charge.
The other statements are correct. Neutral atoms always have the same number of protons as electrons. This means that they are electrically neutral. Cations are positive ions, and anions are negative ions.
In conclusion, option B is correct.
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A solution has a concentration of 0.001 M NaOH (MM = 40.00
g/mol). Suppose you have 1000 g of this solution which
occupies a volume of 1 L. What is the percent by mass
concentration of NaOH?
Percent by mass : 4.10⁺³%
Further explanationThe concentration of a solution can be expressed in units such as molarity, normality, mass percent, volume percent etc.
[tex]\tt \%mass=\dfrac{mass~solute}{mass~solution}\times 100\%[/tex]
mass solute= mass of NaOH
mass of NaOH :
[tex]\tt 0.001~mol/L\times 1~L\times 40~g/mol=0.04~g[/tex]
mass solution = 1000 g
% mass :
[tex]\tt \dfrac{0.04}{1000}\times 100=4.10^{-3}\%[/tex]
The percent by mass concentration of NaOH in the given solution is approximately 0.004%.
To calculate the percent by mass concentration of NaOH, we must find the mass of NaOH in solution.
First, we determine how many moles of NaOH are present in the solution:
Molarity (M) is calculated as moles of solute per liter of solution.
1 L = 0.001 M = mole of NaOH
We rearrange the equation to find that one mole of NaOH is equal to 0.001 moles.
Mass of NaOH = moles of NaOH * molar mass of NaOH
Mass of NaOH = 0.001 mol * 40.00 g/mol
Mass of NaOH = 0.04 g
The mass of the solution is 1000 g which is given in the question.
Percent by mass concentration of NaOH = (mass of NaOH / mass of solution) * 100%
Percent by mass concentration of NaOH = (0.04 g / 1000 g) * 100%
Percent by mass concentration of NaOH = 0.004%
Hence, the percent by mass concentration of NaOH in the given solution is approximately 0.004%.
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pls help!!
The number that represents a neutral pH is ________.
Answer:
7
Explanation:
PLEASE HURRT I NEED HELP ASAP !!!!!!!!!!!!!!
Answer:
I think its b
Explanation:
well because thermal energy its connected to kidnetic energy
What is one property of most complex solid compounds?
A. low boiling point
B. high melting point
C. high temperature
D. low temperature
Determine the molarity of 1.2 mol KCl in 1.1 L of a solution?
Answer:
1.1 M
General Formulas and Concepts:
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define variables
1.2 mol KCL
1.1 L of solution
M = unknown
Step 2: Solve for Molarity
Substitute: M = 1.2 mol/1.1 LEvaluate: M = 1.09091Step 3: Check
We are given 2 sig figs. Follow sig fig rules.
1.09091 M ≈ 1.1 M
Brad pushed a shopping cart directly toward his car at a constant velocity for 6.0 seconds.
During that time, Brad's daughter jogged past him at 2.4 meters per second, and the cart
moved 6.6 meters. What was the cart's velocity?
Answer:
Watch Naruto that's the answer
Explanation:
4. a solution that is 0.025M in HCOOH and 0.025M in NaCOOH
Problem 7
I want to make a solution that will have [HCOO 1 3[HCOOH). I start with 100ml of a 0.1M HCOOH solution. How many ml of a 1M KOH solution
should I add?
KOH added : 7.5 ml
Further explanationBuffer solution of weak acid HCOOH and strong base KOH
Reaction
initial = 100 ml 0.1 M HCOOH = 10 ml mol HCOOH, and x mlmol of KOH
KOH + HCOOH ⇒ COOHK + H₂O
x 10
x x x x
- 10-x x x
[HCOO - ] = 3[HCOOH]
[tex]\tt \dfrac{x}{x+100~ml}=3\dfrac{10-x}{x+100}\\\\x=3(10-x)\\\\x=30-3x\\\\4x=30\rightarrow x=7.5~ml[/tex]
Q2. A 0.696 mol sample of Cu is added to 146 mL of 5.5 M HNO3. Assuming the following
reaction is only one that occurs;
Cus) + HNO3(aq) → Cu(NO3)2(aq) + H2O() + NO()
Will the Cu react completely? What is the limiting reagent and what is the remaining compound
in mass?
Explanation:
Given parameters:
Number of moles of Cu = 0.696mol
Volume of HNO₃ = 146mL
Concentration of HNO₃ = 5.5M
Unknown:
Will Cu react completely = ?
Limiting reagent = ?
Remaining mass of the compound = ?
Solution:
The equation of the reaction is given as;
Cu + 4HNO₃ → Cu(NO₃)₂ + 2H₂O + 2NO₂
Let us find the number of moles of HNO₃ ;
Number of moles = concentration x volume
Number of moles = 5.5 x 146 x 10⁻³L = 0.803mol
From the balanced reaction equation;
1 mole of Cu reacted with 4 mole of HNO₃
0.696 mole of Cu will require 4 x 0.696 = 2.784mole of HNO₃
So, the limiting reactant is HNO₃ because it is in short supply.
Cu will completely react
Mass of the remaining compound we need;
mass = number of moles x molar mass
Number of moles = 2.784 - 0.803 = 1.981mole
So, mass = 1.981 x (1 + 14 + 3(16)) = 124.81g of HNO₃ is required to make the reaction complete.
The limiting reagent is HNO3 and the remaining compound in mass is 25.1 grams of Cu.
The reaction taking place in the given case is,
Based on the given information,
• The moles of Cu given is 0.696 moles.
• The volume of HNO3 given is 146 ml and the molarity of HNO3 is 5.5 M.
Now the moles of HNO3 can be determined as,
[tex]Moles = \frac{M1V1}{1000} \\Moles = \frac{5.5M*146 ml}{1000} \\Moles = 0.803 moles[/tex]
• In order to find the limiting reagent, there is a need to divide moles by their stoichiometric coefficient, that is,
Cu = 0.696/3 = 0.232 moles and HNO3 = 0.803/8 = 0.100 moles
• As the moles of HNO3 is present in less amount, therefore, HNO3 will be the limiting reagent.
Now the remaining copper left in the reaction will be,
[tex]= 0.696-\frac{3}{8} *0.803\\= 0.696-0.300\\= 0.396 moles[/tex]
Now the mass of remaining copper will be = Moles * Molecular mass of Cu
[tex]Mass = 0.396 moles * 63.5 g/mol\\Mass = 25.1 g[/tex]
Thus, the mass of remaining compound is 25.1 grams and the limiting reagent is HNO3.
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How many mL (to the nearest mL) of 0.140-M KF solution should be added to 400. mL of 0.212-M HF to prepare a pH
Answer:
205mL of 0.140M KF solution
Explanation:
pH = 2.70 solution.
It is possible to obtain the pH of the buffer of HF-KF using the H-H equation:
pH = pKa + log [KF] / [HF]
Where pH is desire pH = 2.70
pKa is pKa of HF = 3.17
[KF] could be taken as moles of KF
And [HF] moles of HF: 400.0mL = 0.4L * (0.212mol/L) = 0.0848 moles of HF
Replacing:
2.70 = 3.17 + log [KF] / [0.0848 moles HF]
-0.47 = log [KF] / [0.0848 moles HF]
0.3388 = [KF] / [0.0848 moles HF]
[KF] = 0.02873 moles of KF must be added.
In mL using concentration of KF (0.140M):
0.02873 moles KF * (1L / 0.140 mol) = 0.205L =
205mL of 0.140M KF solutionCalculate the solubility of silver chloride in a solution that is 0.160 M in NH3. Express your answer using two significant figures. S
Balanced chemical equation :
[tex]2NH_3(aq)+AgCl(s) ->Ag(NH_3)_2^+(aq) + Cl^-(aq)[/tex], [tex]K_{sp}=2.9\times 10^{-3}[/tex]
So, solubility product will be equal to [tex]K_{sp}[/tex] :
[tex]K_{sp}=\dfrac{[Ag(NH_3)_2^+][Cl^-]}{[NH_3]^2}\\\\2.9\times 10^{-3}=\dfrac{S.S}{(1.6-2S)^2}[/tex]
Solving above we get :
S = 0.041
Therefore, solubility of silver chloride is 0.041 .
Hence, this is the required solution.
How many grams of CO2 are produced from 10 grams of C2H6
Answer:
Explanation:
no of moles of C2H6=10/30=0.33
complete combustion of 2 moles of ethane produce 4 moles of CO2 therefore 0.33 moles of C2H6 produced 0.66 moles of CO2
now moles =given mass/molar mass
mass= moles*molar mass
mass of CO2=0.67*44=29.48 g
18. A pure substance in the form of a mystery powder in the lab could not be
separated by any physical changes. However, when this pure substance is put over
a flame, a chemical change takes place forming a gas of carbon dioxide along with
a different looking powder. Based on this evidence, which type of matter is most
likely the pure substance?
Answer:a compound
Explanation:
Which method of heat transfer causes magma to circulate in the mantle?
Answer:
i hope this helps
Magma in the Earth's mantle moves in convection currents. The hot core heats the material above it, causing it to rise toward the crust, where it cools. The heat comes from the intense pressure on the rock, combined with the energy released from natural radioactive decay of elements.
Explanation:
A train travels 245 km in 6.25 hours. What is the speed of the train?
Group of answer choices
53.2 km/hr
1531.25 km/hr
39.2 m/h
39.2 km/hr
Answer:
D
Explanation:
My favorite pancake recipe
2 cups all purpose | plain flour, (290 g | 10 oz)
1/4 cup granulated sugar or sweetener, (60g | 2 oz)
4 teaspoons baking powder
1/4 teaspoon baking soda
1/2 teaspoon salt
1 3/4 cups milk, (440ml)
1/4 cup butter, (60g | 2 oz)
2 teaspoons pure vanilla extract
1 large egg
Combine everything in a bowl (separate wet and dry) and cook at medium low heat until it is brown and there are bubbles on top. Then serve with syrup. Good luck!!!
When forming ions, nitrogen will gain or lose how many electrons, forming a cations or anions with a what charge?
Answer:
Nonmetals form negative ions (anions). A nitrogen atom must gain three electrons to have the same number of electrons as an atom of the following noble gas, neon. Thus, a nitrogen atom will form an anion with three more electrons than protons and a charge of 3−.
Explanation:
have advanced
what is the funny number
666
Explanation:
nhgytfghgtfgv
6. Even when matter goes through a physical or chemical change the matter cannot be ____ or ___.
Calculate the new pressure of a gas if the gas at 50 ˚C and 81.0 kPa is heated to 100 ˚C at a constant volume.
Answer:
93.5 kPa
Explanation:
Step 1: Given data
Initial pressure (P₁): 81.0 kPaInitial temperature (T₁): 50 °CFinal pressure (P₂): ?Final volume (T₂): 100 °CStep 2: Convert the temperatures to the Kelvin scale
When working with gases, we need to consider the absolute temperature. We will convert from Celsius to Kelvin using the following expression.
K = °C + 273.15
T₁: K = 50°C + 273.15 = 323 K
T₂: K = 100°C + 275.15 = 373 K
Step 3: Calculate the final pressure of the gas
At a constant volume, we can calculate the final pressure of the gas using Gay-Lussac's law.
P₁/T₁ = P₂/T₂
P₂ = P₁ × T₂/T₁
P₂ = 81.0 kPa × 373 K/323 K
P₂ = 93.5 kPa
Salt water is classifies as a
Answer:
Salt water is classified as a mixture.
Explanation:
Given that 10.00mL of 0.1894M CH3COOH was titrated with 0.2006M NaOH in this experiment, calculate the volume, in mL, of NaOH required
Answer:
[tex]V_{base}=9.442mL[/tex]
Explanation:
Hello!
In this case, when acetic acid is titrated with sodium hydroxide, the following chemical reaction is carried out:
[tex]CH_3COOH+NaOH\rightarrow CH_3COONa+H_2O[/tex]
Whereas there is a 1:1 mole ratio between the acid and the base, which means that at the equivalence point we evidence:
[tex]n_{acid}=n_{base}[/tex]
Which in terms of volumes and concentrations is written as:
[tex]M_{acid}V_{acid}=M_{base}V_{base}[/tex]
Thus, solving for the required volume of base, we obtain:
[tex]V_{base}=\frac{M_{acid}V_{acid}}{M_{base}}=\frac{0.1894M*10.00mL}{0.2006M}\\\\ V_{base}=9.442mL[/tex]
Best regards!
Write the correct name for each compound. a. N2O5 b. Si2F4 c. S3F d. OF2 e. H4P6 f. C2O4 g. HF3
Could you please help I am struggling with this
Answer:
a. Boron trifluoride
b. Propane
c. Dinitrogen pentoxide
d. Carbon Dioxide
e. Silicon Octafluroride?
Explanation:
Glad to help :)
A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sleds potential energy
Answer:
[tex]\boxed {\boxed {\sf882 \ Joules}}[/tex]
Explanation:
Potential energy can be found by multiplying the mass by the height by the gravitational acceleration.
[tex]PE=mgh[/tex]
The mass is 45 kilograms. The height is 2 meters. The gravitational acceleration on Earth is 9.8 meters per seconds squared.
[tex]m=45 \ kg \\h= 2 \ m \\g=9.8 \ m/s^2[/tex]
Substitute the values into the formula.
[tex]PE=45 \ kg * 2 \ m * 9.8 m/s^2[/tex]
Multiply.
[tex]PE=441 kg*m/s^2*2 \ m[/tex]
[tex]PE= 882 \ kg *m/s^2 *m[/tex]
1 kg*m/s^² is equal to 1 Newton (N). Substitute N in for kg*m/s²
[tex]PE=882 \ N*m[/tex]
1 Newton meter (N*m) is equal to 1 Joule (J). Our current answer is equivalent to 882 Joules.
[tex]PE= 882 \ J[/tex]
The sled's potential energy is 882 Joules.
Answer:
882 J
Explanation:
A 6.0 M HCI solution is diluted to make 500 mL of a 2.5 M HCI solution. What volume of the 6.0 M HCI solution is required to make this solution?
Answer:
V₁ = 208.3 mL
Explanation:
Given data:
Initial molarity of HCl = 6.0 M
Final volume = 500 mL
Final molarity = 2.5 M
Volume of initial solution required = ?
Solution:
Formula:
M₁V₁ = M₂V₂
Now we will put the values in formula.
6.0 M × V₁ = 2.5 M ×500 mL
6.0 M × V₁ = 1250 M.mL
V₁ = 1250 M.mL / 6.0 M
V₁ = 208.3 mL
Syrup used for hummingbird feeders is commonly 25% sucrose (C12H22O11) by mass. if you wish to make 1.0 kg of this soltion, what calculate the quantitity of sucrose and the quantitiy of water that you should use.
Calculate the molality (m) of the 25% sucrose solution in the question above,
The density 25% a sucrose solution at room temperature is 1.10 g/mL. calculate the molarity (M) of the 25% sucrose solutino.
Answer:
m
Explanation:
PLS HURRY
What methods are you using to test this (or each) hypothesis?
Answer:
Fair test.
PLS GIVE BRAINLIEST
HURRY PLEASE HELP
Four students are discussing the benefits and problems associated with using nuclear energy as alternative energy source. Which student has the strongest argument about using nuclear energy?
A. Nuclear power plants pollute the environment and causes cancer in populations that use nuclear energy instead of traditional electricity.
B. Nuclear power plants provide more energy than traditional coal plants; however, nuclear power plants also produce more greenhouse gases.
C. Nuclear power plants run a high risk of nuclear meltdown killing all the organisms in a 20 mile radius.
D. Nuclear power plants provide more energy than traditional coal plants and these plants do not produce greenhouse gases.
Answer:
A
Explanation:
its A
facts o.o
Nuclear power plants pollute the environment and causes cancer in populations that use nuclear energy instead of traditional electricity. Hence option A is correct.
What is nuclear power plant?Nuclear power plant is defined as a particular kind of power plant that produces electricity by nuclear fission. Nuclear power plants use the heat generated by nuclear fission to transform water into steam in a controlled environment, which then powers generators to produce electricity. Low-enriched uranium fuel is used in nuclear power plants to generate electricity through a process known as fission, which involves breaking uranium atoms in a nuclear reactor.
A clean energy source with no emissions is nuclear. It produces energy by fission, which is the splitting of uranium atoms to release energy. Without the toxic consequences that come from burning fossil fuels, electricity is produced using the heat from fission to produce steam, which turns a turbine.
Thus, nuclear power plants pollute the environment and causes cancer in populations that use nuclear energy instead of traditional electricity. Hence option A is correct.
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Is steel wool and vinegar an exothermic reaction? Explain.
Answer:
Vinegar contains acetic acid which removes this coating. When the protective coating is removed, oxygen in the atmosphere can reach the iron in the steel wool and a chemical reaction called oxidation occurs. ... This reaction is also an exothermic reaction. It creates heat energy
Explanation:
hope this helps u
Vinegar incorporates acetic acid which gets rid of this coating. When the defensive coating is removed, oxygen in the environment can reach the iron in the metal wool and a chemical reaction called oxidation occurs. This reaction is additionally an exothermic reaction. It creates warmth energy.
Hope it helped! Have a nice day! <3
Bromine (Br) has ____ valence electrons. When it forms an ionic bond, it _____ one electron and has a charge of _____
Answer:
7 valence e-, obtain e-, negative
If you cross a purebred black fur (BB) parent with a purebred white fur
(bb) parent, all the offspring will be
Answer: Bb
Explanation:
The capital B (purbred black fur) is domaint the the lower case b(purebred white fur)
What is the concentration, mass/volume percent (m/v), of a solution prepared from 30.gNaCl and 1.5 L of water?
The concentration, mass/volume percent (m/v) : 1.98%
Further explanation[tex]\tt \%m/v=\dfrac{mass~solute}{volume~of~solution}\times 100\%[/tex]
mass solute = mass of NaCl = 30 g
volume of solution = volume of water + volume of NaCl
volume of water = 1.5 L = 1500 ml
volume of NaCl :(density = 2.16 g/ml)
[tex]\tt V=\dfrac{30}{2.16}=13.8~ml[/tex]
volume of solution :
[tex]\tt 1500+13.8=1513.8~ml[/tex]
the concentration (%m/v) :
[tex]\tt \dfrac{30}{1513.8}\times 100=1.98\%[/tex]
