Answer:
The full form of PET is Polyethylene Terephthalate.
What mass of Na2SO4is needed to make 2.5 L of 2.0 Msolution? (Na = 23 g; S = 32 g; O = 16 g)
a.356 g
b.284 g
c.710 g
d.178 g
Answer:
mass (g) needed = 710.2 grams Na₂SO₄(s)
Explanation:
Needed is 2.5 Liters of 2.0M Na₂SO₄; formula wt Na₂SO₄ = 142.04g/mol.
mass (grams) of Na₂SO₄(s) = Molarity needed x Volume needed in Liters x Formula Wt of solute
mass (grams) of Na₂SO₄(s) = (2.5L)(2.0M)(142.04g/mol) = 710.2 grams Na₂SO₄(s)
Mixing: Transfer 710.4 grams Na₂SO₄ into mixing vessel and add water-solvent up to but not to exceed 2.5 Liters total volume. Mix until dissolved.
Gives 2.5 Liters of 2.0M Na₂SO₄(aq) solution.
How does an indicator show the difference between an acid and an alkali?
Answer: There are various indicators like litmus paper, phenolphthalein, universal indicator etc. that changes its colour to show the difference between acid and alkali.
A student wants to make a 0.600 M aqueous solution of barium sulfate, BaSO4, and has a bottle containing 12.00 g of barium sulfate. What should be the final volume of the solution?
Find the numerical answer for this question and make sure to include the following:
What is the formula for molarity?
What is the molar mass for barium sulfate?
When you give your numerical answer, what are the correct significant figures and how do you know that is the correct amount?
Need this ASAP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer: The volume of the solution is 85.7 mL
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex] .....(1)
We are given:
Molarity of solution = 0.600 M
Given mass of [tex]BaSO_4[/tex] = 12.00 g
We know, molar mass of [tex]BaSO_4=[(1\times 137.33)+(1\times 32.07)+(4\times 16)]=233.4g/mol[/tex]
Putting values in equation 1, we get:
[tex]0.600=\frac{12.00\times 1000}{233.4\times \text{Volume of solution}}\\\\\text{Volume of solution}=\frac{12.00\times 1000}{233.4\times 0.600}=85.68mL=85.7mL[/tex]
The rule of significant number that is applied for the problems having multiplication and division:
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
Here, the least number of significant figures is 3 that is determined by the number, 0.600. Thus, the answer must have these many significant figures only.
Hence, the volume of the solution is 85.7 mL
Can someone pls help I need this quick
Zinc has been added to dilute sulphuric acid. The two react together and a gas bubble forms. The gas that forms is hydrogen. Prove why the gas is hydrogen.
Answer:
Here's your answer
Explanation:
When we insert a burning matchstick near the mouth of gas jar the matchstick burns with a pop sound and produces a blue flame. This proves that the gas collected is hydrogen.
hope it helps
How do the Carnivorous plants survive without soil?
Answer:
A simple answer: Carnivores don't eat plants only flesh. So they would not need soil. But it would be hard for Carnivores to get energy because they get energy indirectly from the animals (herbivores) that they eat. How do they get the energy from a herbivore you might ask. Herbivores eat only plants and that gives the herbivore the plant's energy; but if the herbivore gets eaten, it is indirectly transferred into the Carnivore. Hope this helped!!
Carnivore = only feeds on flesh
Herbivore = eats only plants
Omnivore = eats plants and animals/flesh
Which substance is a basic oxide?
The oxide that gives a base in water is known as a basic oxide. An amphoteric solution is a substance that can chemically react as either acid or base. However, it is also possible for an oxide to be neither acidic nor basic, but is a neutral oxide.
why is dilute tetraoxosulphate(VI) acid not suitable for preparing carbon monooxide
Answer: Because this does not dissolve in water - it forms a barrier on the surface of the unreacted CaCO3 which prevents any further reaction. A small volume of CO2 is produced , but this stops after a short time . Conclusion: H2SO4 cannot be used with CaCO3 to produce CO2 gas .
Explanation:
Which two of the following changes of state involve solids?
Select two (2) answers
A. melting
B. boiling
C. freezing
D. evaporating
Answer:
Answer is A... Melting and freezing
Give an example of each of the following chemical changes.
(a) A photochemical reaction involving
(i) silver salt
(ii) water
(b) A reaction involving
(i) blue solution
(ii) formation of dirty green precipitate
(c) Two gases combine to form white solid.
(d) A reaction where colour change is noticed.
Answer:
Give an example of each of the following chemical changes.
(a) A photochemical reaction involving
(i) silver salt
(ii) water
(b) A reaction involving
(i) blue solution
(ii) formation of dirty green precipitate
(c) Two gases combine to form white solid.
(d) A reaction where colour change is noticed.
Explanation:
a) A photochemical reaction involving silver salt is used in black and white photography.
AgCl breaks down and converts into Ag during this photochemical reaction.
(ii) Photochemicalreaction involving water takes place in plants during the photosynthesis process.
Plants prepare food(carbohydrate) by using sunlight water and CO2 gas.
(b) A reaction involving
(i) blue solution:
For example reaction of copper sulfate solution with an iron nail.
When an iron nail is placed in CuSO4 blue color solution, then it changes to green color and reddish-brown solid deposits at the bottom of the container.
(ii) Reaction of ferrous sulfate with NaOH forms a dirty green precipitate of ferrous hydroxide.
(C) Two gases combine and form a white solid:
For example when HCl gas reacts with ammonia gas, then a white solid of ammonium chloride will be formed.
(d) A reaction where the color change is noticed.:
When an iron nail is placed in CuSO4 blue color solution, then it changes to green color and reddish-brown solid deposits at the bottom of the container.
3 Cu + 8HNO3 → 3 Cu(NO3)2 + 2 NO + 4 H2O
In the above equation, how many grams of water can be made when 15.9 moles of HNO3 are consumed?
Answer:
45673
Explanation:
Equation balancing
a. S(s) + O2(g) → SO3(g)
b. 2Al(s) + 3Cl2(g) ► 2AICI3(s)
E. 2NaOH(s) + H2SO4(ac) —Na2So (ac) + H2O(l)
d. C3H8(g) + 50(g) -3C02(g) + 4H2O(g)
Answer:
For a: The balanced equation is [tex]2S(s)+3O_2(g)\rightarrow 2SO_3(g)[/tex]
For c: The balanced equation is [tex]2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)[/tex]
Explanation:
A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.
For (a):The given unbalanced equation follows:
[tex]S(s)+O_2(g)\rightarrow SO_3(g)[/tex]
To balance the equation, we must balance the atoms by adding 2 infront of both [tex]S(s)[/tex] and [tex]SO_3[/tex] and 3 in front of [tex]O_2[/tex]
For the balanced chemical equation:
[tex]2S(s)+3O_2(g)\rightarrow 2SO_3(g)[/tex]
For (b):The given balanced equation follows:
[tex]2Al(s)+3Cl_2(g)\rightarrow 2AlCl_3(s)[/tex]
The given equation is already balanced.
For (c):The given unbalanced equation follows:
[tex]2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+H_2O(l)[/tex]
To balance the equation, we must balance the atoms by adding 2 infront of [tex]H_2O(l)[/tex]
For the balanced chemical equation:
[tex]2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)[/tex]
For (d):The given balanced equation follows:
[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)[/tex]
The given equation is already balanced.
calculate the oxidation number of the central atom of FeSO4 7H2O
Answer:
[tex]{ \tt{let \: the \: oxidation \: state \: be \: x}} \\ { \bf{x + sulphate \: ion+ water = overall \: charge}} \\ \\ \\ { \tt{x + ( - 2) + 0 = 0}} \\ \\ { \tt{x = + 2}} \\ { \tt{oxidation \: state = + 2}}[/tex]
Edward is gathering physical evidence at the scene of a crime. He finds a fingerprint pressed into the wax of a candle. What type of fingerprint is this?
The type of fingerprint found at the crime scene in this scenario is referred to as plastic.
What is Plastic fingerprint?This is the of fingerprint which is three dimensional and can be easily seen with the human eye.
Plastic fingerprint can be made by pressing the finger on substances such as wax, paint etc.
Read more about Fingerprint here https://brainly.com/question/11165604
#SPJ1
Answer:
the answer would be molded I believe.
choices are Latent,patent, inadmissible molded,trace.
Figure 1 (Use this figure to answer questions 6,7, and 8. Assume that the height at point
A and point C are the same)
С
B
As the car moves from point A, to point B, and finally to point C, the total energy of the car
decreases from point A to point B, then increases from point B to point
increases from point A to point B, then decreases from point B to point
O is lost between points B and C
stays the same, but is converted between potential and kinetic energy
Answer:
JWBVH
Explanation:
NWSBWHSBHS
What is the value of Keq for the reaction expressed in scientific notation? 1.6 ´ 10–5 6.2 ´ 10–4 6.2 ´ 104 1.6 ´ 105
The question is incomplete, the complete question is:
Consider the reaction:
[tex]2NOCl\rightleftharpoons 2NO+Cl_2[/tex]
At equilibrium, the concentrations are as follows. [NOCl] = 1.4 × 10–2 M [NO] = 1.2 × 10–3 M [Cl2] = 2.2 × 10–3 M What is the value of Keq for the reaction expressed in scientific notation?
A) 1.6 × 10–5
B) 6.2 × 10–4
C) 6.2 × 10+4
D) 1.6 × 10+5
Answer: The correct option is A) [tex]1.6\times 10^{-5}[/tex]
Explanation:
The equilibrium constant is defined as the ratio of the concentration of products to the concentration of reactants raised to the power of the stoichiometric coefficient of each. It is represented by the term [tex]K_{eq}[/tex]
For the given chemical equation:
[tex]2NOCl\rightleftharpoons 2NO+Cl_2[/tex]
The expression for equilibrium constant will be:
[tex]K_{eq}=\frac{[NO]^2}{[Cl_2][NOCl]^2}[/tex]
Given values:
[tex][NO]=1.2\times 10^{-3}M[/tex]
[tex][Cl_2]=2.2\times 10^{-3}M[/tex]
[tex][NOCl]=1.4\times 10^{-2}M[/tex]
Putting values in above expression, we get:
[tex]K_{eq}=\frac{(1.2\times 10^{-3})^2\times (2.2\times 10^{-3})}{(1.4\times 10^{-2})^2}\\\\K_{eq}=1.6\times 10^{-5}[/tex]
Hence, the correct option is A) [tex]1.6\times 10^{-5}[/tex]
(1) The solubility of Salt AB2(s) is 5mol/dm^3. (a) Obtain an expression for the solubility product of Salt AB2,in terms of s.
Answer:
See explanation
Explanation:
Let the equation of dissolution be;
AB2(s) ⇄A(aq) + 2S
Hence;
Ksp = [A] [2s]^2
Let the concentration of the species be s
Ksp= s × (2s)^2
Ksp= 4s^3
Since s= 5mol/dm^3
Ksp = 4(5mol/dm^3)^3
Ksp = 500 mol^2dm^-6
help please I would really appreciate
Answer:
option C
Positive terminal of the cell connected with redExplanation:
hope it may help you
A boulder rests on a ledge 31.2 m above a lake. If it has 2.65 x 10 J of gravitational
potential energy relative to the lake surface, what is the mass of the boulder?
Answer:
This question is incomplete, the gravitational potential energy is 2.65 x 10^5 J
mass of the boulder = 866.7g
Explanation:
Potential energy (P.E) refers to the energy due to the position of a body. It can be calculated as follows:
P.E = m × g × h
Where;
m = mass of substance (g)
g = acceleration due to gravity (m/s²)
h = height (m)
According to the information provided in this question,
h = 31.2 m
g = 9.8m/s²
m = ?
P.E = 2.65 x 10^5 J
Using P.E = m × g × h
2.65 x 10^5 = m × 9.8 × 31.2
2.65 x 10^5 = 305.76m
265000 = 305.76m
m = 265000 ÷ 305.76
m = 866.69
mass of the boulder = 866.7g
What mass of sulfuric acid, H2SO4, is required to react with 3.27 g of potassium hydroxide, KOH? The products of this reaction are potassium sulfate and water.
Have both the unbalanced and balanced chemical equations.
Explain how to find the molar mass of the compounds.
Explain how the balanced chemical equation is used to find the ratio of moles
Explain how many significant figures your answer needs to have.
The numerical answer
Answer:
pa help din ako jan pleaseAnswer:
Don't plagiarize here.
Explanation:
Your online teacher knows that you are looking here for the answer!!!!
describe about chromatography
Answer: Chromatography is a technique for the separation of a mixture. The mixture is dissolved in a fluid (gas, solvent, water, ...) called the mobile phase, which moves it through a system (a column, a capillary tube, a plate, or a sheet) on which is fixed a material called the stationary phase.
Explanation:
Question 9 of 10
Which functional group does the molecule below have?
Answer:
Hydroxyl
Explanation:
A P E X
Subtract to find the temperature changes
for the water and the metal.
Answer:
???what metal????????????
CHEM FINAL PLEASE HELP
This is?
alkene
aromatic hydrocarbon
alkyne
alkane
Answer:
It is alkyne
Explanation:
pls answer the following question for me
1. and C.
Terrycot is a fiber that is made by mixing two fibers. Terrycot is a blended fabric made of terylene and cotton. It has better absorbing power as compared to Terylene. Nylon and terylene are produced through condensation polymeriztation.
Hope it helps...
Answer:
Explanation:
1-B
2-A
3-D
4-C
State the name(s) of the sub-atomic particle(s) that have/has a positive charge. Answer with the name of the particle(s) only.
A. Neurons
B. Protons
C. Electrons
Answer:
protons because they have the most positive charge
A gas has a volume of 1000.0 mL at a temperature of 20.OK and a pressure
of 1.0 atm. What will be the new volume when the temperature is changed
to 40.0K and the pressure is changed to
0.5 atm?
Answer:
4000mL
Explanation:
Using the combined gas law equation;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (mL)
V2 = final volume (mL)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information given in this question:
V1 = 1000mL
T1 = 20K
P1 = 1.0atm
V2 = ?
P2 = 0.5atm
T2 = 40K
Using P1V1/T1 = P2V2/T2
1 × 1000/20 = 0.5 × V2/40
1000/20 = 0.5V2/40
50 = 0.5V2/40
50 × 40 = 0.5V2
2000 = 0.5V2
V2 = 2000/0.5
V2 = 4000mL
Será lançado na próxima quarta-feira, 1º de julho, em São Bernardo do Campo (SP), o primeiro ônibus brasileiro a hidrogênio. [...] O projeto Ônibus Brasileiro à Célula Combustível a Hidrogênio é o ponto de partida para o desenvolvimento de uma solução mais limpa para o transporte público urbano no Brasil. (Disponível em: Acesso em: 19 out. 2009.) Quanto aos processos químicos envolvidos na produção de energia elétrica em células de combustíveis a partir do oxigênio e do hidrogênio, é correto afirmar:
The number of molecules in 17.9 g of CO is
Answer:
3.85 × 10²³ molecules CO
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableCompoundsMolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify
[Given] 17.9 g CO
[Solve] molecules CO
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of C: 12.01 g/mol
[PT] Molar Mass of O: 16.00 g/mol
Molar Mass of CO: 12.01 + 16.00 = 28.01 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 17.9 \ g \ CO(\frac{1 \ mol \ CO}{28.01 \ g \ CO})(\frac{6.022 \cdot 10^{23} \ molecules \ CO}{1 \ mol \ CO})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 3.8484 \cdot 10^{23} \ molecules \ CO[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
3.8484 × 10²³ molecules CO ≈ 3.85 × 10²³ molecules CO
PLEASEE HELLLPPP mE WITH THE QUESTIONS I POSTE DIL MARK U THE BRAINLIEST I SWEAAARr
Answer:
PIEASE E first write question
un estudiante introduce un corcho cuya densidad es 0.95 g/cm en cada uno de los liquidos que figura representa mejor la situacion
Answer:
La respuesta correcta es la opción A.
Explicación:
La densidad del corcho es 0.95g / cm3 por lo que se hundirá en la solución de acetona porque el corcho es más denso que la solución de acetona mientras que por otro lado, el corcho flotará en otros dos líquidos porque la densidad del corcho es menor que en otros dos líquidos o, en otras palabras, los dos líquidos son más densos que el corcho, por eso el corcho flotará en estos dos líquidos.
