Answer:
(1) 0.50M in NaCl
(2) 0.25M in H₂SO₄
Explanation:
Problem 1
Molarity = moles of solute / volume of solution expressed in liters
moles of NaCl (solute) = mass(g)/formula wt.(g/mole
= 116 grams/58g/mole = 2 moles
Volume of solution (given) = 4 Liters
Molarity = 2 moles NaCl / 4 Liters Sol'n = 0.50M in NaCl
Problem 2
again, Molarity = moles of solute / volume of solution expressed in liters
Molarity = 3 moles H₂SO₄ / 12 Liters sol'n = 0.25M in H₂SO₄
A molten metal that catches fire in chlorine gas and gives off white fumes?
Answer:
please give me brainlist and follow
Explanation:
sodium
The molten metal that catches fire in chlorine gas and gives off white fumes is sodium. The metal that forms two types of its oxide and rust in moisture is iron. The formulas of its oxides are : FeO;Fe2O3. The metal used in hot water systems is copper, because it is a good conductor of heat and electricity.
Answer:
I think it is Sodium not sure but try
If have a volume of 18 L of a gas at a temperature of 272 K and a pressure of 90 atm, what will be the pressure of the gas if raise the temperature to 274 Kand decrease the volume to 12 L?
Answer:
P₂ ≅ 100 atm (1 sig. fig. based on the given value of P₁ = 90 atm)
Explanation:
Given:
P₁ = 90 atm P₂ = ?
V₁ = 18 Liters(L) L₂ = 12 Liters(L)
=> decrease volume => increase pressure
=> volume ratio that will increase 90 atm is (18L/12L)
T₁ = 272 Kelvin(K) T₂ = 274 Kelvin(K)
=> increase temperature => increase pressure
=> temperature ratio that will increase 90 atm is (274K/272K)
n₁ = moles = constant n₂ = n₁ = constant
P₂ = 90 atm x (18L/12L) x (274K/272K) = 135.9926471 atm (calculator)
By rule of sig. figs., the final answer should be rounded to an accuracy equal to the 'measured' data value having the least number of sig. figs. This means P₂ ≅ 100 atm based on the given value of P₁ = 90 atm.
8. Write the formulas for and give the names of
the compounds formed by the following ions:
a. Cr2+ and F
b. Ni2+ and 02-
c. Fe3+ and 02-
Which of the following best describes the crest of a transverse wave?
а. length
b. high point
c. speed
d. low point
Answer:
B
Explanation:
How many molecules are in 0.500 mol of AlBr3
.500 mol ( 6.02x10^23 molecules/1 mol) = 3.01x10^23
What is 1 x 102 divided by 1 x 10-3?
O 1x 10-6
O 1x 10-1
0 1x 103
O 1 x 105
Answer:
Option (d) is correct.
Explanation:
Let [tex]x=10^2[/tex] and [tex]y=10^{-3}[/tex].
We need to find the value of [tex]\dfrac{x}{y}[/tex].
Put the values of x and y such that,
[tex]\dfrac{x}{y}=\dfrac{10^2}{10^{-3}}\\\\=10^2\times 10^3\ (As\ \dfrac{1}{x^{-a}}=x^a)\\\\=10^5\ (As\ x^a\times x^b=x^{ab})\\\\=1\times 10^5[/tex]
So, the required answer is equal to [tex]1\times 10^5[/tex]. Hence, the correct option is (d).
Sruthi accidentally poured salt into the lemonade she was making instead of sugar. Can Sruthi remove all the salt by pouring it through a filter? Explain why or why not. 2 marks need answers ASAP, I'll mark brainliest if correct.
Answer:
Yes you can!
Explanation: Here is one method i did in school you can put a cup of the salted lemonade into a big container seal it off and put plastic inside heat it up and the water will evaporate and leak from the sides while the salt will stay in the cup. Pls give me brainliest
Indicate whether the following processes are spontaneous or nonspontaneous. (a) Liquid water freezing at a temperature below its freezing point (b) Liquid water freezing at a temperature above its freezing point (c) The combustion of gasoline (d) A ball thrown into the air (e) A raindrop falling to the ground (f) Iron rusting in a moist atmosphere
Answer:
The correct answer is -
(a) spontaneous;
(b) nonspontaneous;
(c) spontaneous;
(d) nonspontaneous;
(e) spontaneous;
(f) spontaneous
Explanation:
(a) Liquid water freezing at a temperature below its freezing point.
in this reaction, there is no requirement of external energy or force to make it possible due to the fact that the temperature of the environment is less than the freezing point of water. So, the water will spontaneously freeze.
(b) Liquid water freezing at a temperature above its freezing point. the melting of ice takes place with the increase or absorbing the heat which is a nonspontaneous,
(c) The combustion of gasoline produces gas molecules, and release energy which means it is an exothermic reaction, the combustion of gasoline is a spontaneous reaction.
(d) A ball is thrown into the air is not a natural process and it requires force or energy to be complete and works against gravity, Therefore, it is a nonspontaneous reaction.
(e) A raindrop falling to the ground is a naturally occurring reaction without any external force and in the direction of gravity, thus it is a spontaneous reaction.
(f) Iron rusting in a moist atmosphere is a spontaneous reaction as it does not require energy to occur and it naturally takes place. It is a redox reaction.
What is biocapacity?
PLZZ HELP TY
Answer:
Explanation:
The biocapacity or biological capacity of an ecosystem is an estimate of its production of certain biological materials such as natural resources, and its absorption and filtering of other materials such as carbon dioxide from the atmosphere.
Is photosynthesis endothermic or exothermic, why?
A. Endothermoc, energy is needed to oxidize water so it can eventually be stored in sugars. Free energy is temperature dependent.
B. Exothermic, energy is needed to oxide water so it can eventually be stored in sugars. Free energy is not temperature dependent.
C. Endothermic, energy is needed to oxidize water so it can eventually be stored in sugars. Free energy is not temperature dependent.
D. Exothermic, energy is needed to reduce water so it can eventually be stored in sugars.
E. Exothermic, energy is needed to oxidize water so it can eventually be stored in sugars.
F. Exothermic, energy is needed to oxidize water so it can eventually be stored in sugars. Free energy is temperature dependent.
G. Endothermic, energy is needed to reduce water so it can eventually be stored in sugars.
Answer: I think A is right
Explanation: Photosynthesis needs light so it is endothermic,
Oxygen in water is oxidised and Oxygen is released in process.
Free energy is temperature dependent. But also Carbo dioxide
involves reaction. You needs to find out Calvin-Benson cycle
If I have 100 mL of oil in a container and 100 mL of water in another
conta in er Which container wouldhave more mass?
Answer:
The answer is 200mL each amount have the same mass
Explanation:
100mL +100ML= 200mL mass in each container
Answer:
200ml
Explanation:
Plz answer very fast anyone knows
Answer:
probably the sun
.
Explanation:
because the sun's heat result to evaporation
3. What is the current in a wire
that has a resistance of 2.5 Q
and is connected to a 12 V
battery?
93 Points!!! Which of the following join together to form molecules?
Atoms
Organisms
Organs
Tissues
Answer:
Atoms
Explanation:
Atoms are the smallest thing meaning they form molecules which are made of atoms.
Also, your question is not 93 points but whatever lol.
Answer:
Atoms
Explanation:
I took the test
The petrol additive tetraethyl-lead (IV), Pb(C2H3)4, is now
banned in many countries. When it is completely burned in air,
lead (II) oxide, CO, and H2O are formed. How many moles of
oxygen are required to burn one mole of Pb(C2H5)?
Answer:
9.5 mol
Explanation:
Let's consider the unbalanced equation for the combustion of tetraethyl-lead (IV).
Pb(C₂H₅)₄ + O₂ ⇒ PbO + CO + H₂O
Pb atoms are balanced. We will balance C atoms by multiplying CO by 8.
Pb(C₂H₅)₄ + O₂ ⇒ PbO + 8 CO + H₂O
Then, we will balance H atoms by multiplying H₂O by 10.
Pb(C₂H₅)₄ + O₂ ⇒ PbO + 8 CO + 10 H₂O
Finally, we get the balanced equation by multiplying O₂ by 9.5.
Pb(C₂H₅)₄ + 9.5 O₂ ⇒ PbO + 8 CO + 10 H₂O
All in all, we need 9.5 moles of O₂ to burn 1 mole of Pb(C₂H₅)₄.
How much heat will be absorbed when 38.2 g of bromine reacts with 12.4g of hydrogen according to the following equation?
H2 + Br2 + 72.80 = 2HBr
Answer:
17.4 kJ
Explanation:
When you draw a bow'across a violin string, which kind of wave is created in
the air surrounding the string?
A. surface
B. electromagnetic
C. longitudinal
D. Transverse
Answer:
C
Explanation:
Answer: C. Longitudinal
Explanation: A P 3 X
Which of the following has to remain constant to allow you to use the combined gas law for calculations?
O A pressure
ОВ.
volume
Oc.
temperature
OD.
amount of gas
Answer:
Amount of gas
Explanation:
The combined gas law has to do with pressure, volume, and temperature. All of them can be a variable that you have to solve for. However, amount of gas is not a variable you can solve for, which means it must remain constant.
True or false: to get 8 valence electrons, oxygen can borrow or share some electrons
Answer:
True
Explanation:
In ionic compounds, oxygen borrows electrons. In covalent compounds, oxygen shares electrons.
Calculate the molar mass of ZnCr04
Answer:
181.403 g/mol is the answer as it is Zinc chromate
Explanation:
Answer:
181.403 g/mol
Explanation:
Molar mass of ZnCrO4 = 181.3737 g/mol. This compound is also known as Zinc Chromate. Convert grams ZnCrO4 to moles or moles ZnCrO4 to grams. 65.38 + 51.9961 + 15.9994*4
i If a chemical system is at equilibrium, any change in the system will always result in an increase of which of the following?
1.The reaction that opposes the change
2. The concentration of the product
3. The concentration of the reactants
4. The temperature of the system
Answer:
1.The reaction that opposes the change
Explanation:
Consider the reaction;
A + B ⇄ C + D
If a constraint such as a change in temperature, pressure or volume is imposed on this chemical system in dynamic equilibrium, the equilibrium position will shift so as to annul the constraint.
This shift in the equilibrium position will favour either the forward or reverse reaction depending on the type of constraint imposed on the system.
Hence, If a chemical system is at equilibrium, any change in the system will always result in an increase of the reaction that opposes the change.
Enter an equation showing how this buffer neutralizes added aqueous acid (HI). Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]
Explanation:
Hello there!
In this case, since the buffer is not given, we assume it is based off ammonia, it means the ammonia-ammonium buffer, whereas the ammonia is the weak base and the ammonium ion stands for the conjugate acid. In such a way, when adding HI to the solution, the base of the buffer, NH3, reacts with the former to promote the following chemical reaction:
[tex]H^++NH_3\rightleftharpoons NH_4^+[/tex]
Because the HI is totally ionized in solution so the iodide ion becomes an spectator one.
Best regards!
Answer:
the above answer is wrong
Explanation:
its really not but the mastering chemistry says it is
Identify the most and the least acidic compound in each of the following sets. Leave the remaining answer in each set blank. a) 2,4-dinitrobenzoic acid: _______ p-nitrobenzoic acid: _______ p-bromobenzoic acid: _______ b) oxalic acid: _______ acetic acid: _______ formic acid: _______ c) p-cyanobenzoic acid: _______ benzoic acid: _______ p-aminobenzoic acid:
Answer:
a) 2,4-dinitrobenzoic acid: the most acidic compound, p-nitrobenzoic acid: _______, p-bromobenzoic acid: the least acidic compound
b) oxalic acid: the most acidic compound, acetic acid: the least acidic compound, formic acid: _______.
c) p-cyanobenzoic acid: the least acidic compound, benzoic acid: the most acidic compound, p-aminobenzoic acid: _______.
Explanation:
a) 2,4-dinitrobenzoic acid is the most acidic compound of this set because it has two strong electronegative substituents (nitrogen dioxide) which increases the acidity of benzoic acid, while p-bromobenzoic acid is the least acidic compound because bromine is a weaker electron withdrawing group than nitrogen dioxide.
b) The presence of 2 -COOH group makes Oxalic acid the most acidic compound of this set, while decrease in acidity of carboxylic acid due to the presence of methyl group on carbon of -COOH group makes acetic acid the least acidic compound of this set.
(c) Benzoic acid has a higher acid dissociation constant value (4.45 Ka) therefor it is the most acidic compound of this set, while p-cyanobenzoic acid is the least acidic compound of this set as it has the least acid dissociation constant value (16 Ka).
Convert 550 torr into SI units.
Question 10 options:
1 atm
73,326 Pa
101,325 Pa
700 mm Hg
Answer:
73,326 Pa
Explanation:
73,326 Pa
Ametal added to gold to harden it ?
Answer:
copper
Explanation:
Copper is used as a base metal to mix with gold and to make it stronger, harder and less brittle in nature. It acts as the best alloy to make ornaments. Since the Silver layer gets easily oxidized in nature and gets easily corroded, copper remains the best choice as a metal to mix with Gold.
What is the mass of a 0.5 mol sample of C2H6?
Answer: 30.08 g/mol
Explanation:
C2= 12.01 H6=1.01
12.01(2) + 1.01(6) =
24.02 + 6.06 =
30.08 g/mol
Please help me! It’s past due but he giving me 15 mins!
What is mechanical advantage?
A. It is used to create friction.
B. It is a basic machine that makes work easier.
C. It is the number of times a machine
multiplies the effort force.
D. It is how much buoyancy an object has.
Answer:
i think its letter d
#1 pls help me complete
Answer:
n = 0.045 mol.
Explanation:
Hello there!
In this case, according to the given problem, we can firstly set up the ideal gas equation as shown below:
[tex]PV=nRT[/tex]
Thus, as we are asked to calculate the moles, we proceed as follows:
[tex]n=\frac{PV}{RT}[/tex]
Therefore, we plug in the given data to obtain:
[tex]n=\frac{760mmHg*\frac{1atm}{760mmHg}*1.0L}{0.08206\frac{atm*L}{mol*K}*273K} \\\\n=0.045mol[/tex]
Best regards!
free 85 points Which career combines DNA technology and medicine?
pharmaceuticals
paternity testing
environmental studies
biopesticide development
Answer:
pharmaceuticals
Explanation:
Answer:
Its the first one pharmaceuticals
Explanation: