Answer:
C
Explanation:
If you add enough heat to a solid it eventually becomes a liquid
calculate the volume of the object immersed in the water in the water in the adjoining figur.
Answer:
100 cm³
Explanation:
Hi there!
Subtract:
400 cm³ - 300 cm³
= 100 cm³
Therefore, the volume of the object is 100 cm³.
I hope this helps!
an atom contains positive protons and negative electrons. Why atom is electrically neutral.
Answer:
atom is electrically neutral because
the no.of protons is equal to no.of
electrons.
Therefore the negative charge and
positive charge cancels out.
During an experiment the students prepared three mixtures A)Starch in water B) Sodium chloride solution C) Tincture of Iodine. i) Students observed a visible beam of light through mixture A. Why? ii) Tincture of Iodine did not show Tyndall effect . Explain reason. iii) How can you relate particle size to Tyndall effect?
The question requires a good knowledge of the meaning of Tyndall effect or scattering of light by false solutions in chemistry
The student observed a beam of visible light through mixture A because A exhibits Tyndall effect
Tincture of Iodine does not show Tyndall effect because its solution consists of particles less than 1 nanometer in solution.
A solution may be classified as a true solution or a false solution. A true solution consists of particles which are less than 1 nanometer in solution. A true solution does not scatter visible light.
A false solution, on the other hand consists of particles larger than 1 nanometer and does scatter visible light.
Starch in water is an example of a false solution or colloid hence it exhibits Tyndall effect. The scattering of visible light by a solution is known as Tyndall effect.
Tincture of iodine and sodium chloride in water are all true solutions hence they do not scatter visible light.
https://brainly.com/question/23487849
In a synthesis experiment you obtain a sample of product on which you do a melting point determination and find a melting point range of 114 to 125 degrees Celsius. The sample is supposed to be acetylsalicyclic acid. What preliminary conclusion(s) can you reach from this one determination
Answer:
The melting point determination may need improvement- it may not have been done properly, and make sure it was repeated at least once.
Explanation:
Given that we know the actual melting point of pure acetylsalicyclic acid to be 135°, it follows that the process followed to obtain the melting point range of 114 to 125 degrees Celsius must be inaccurate.
Therefore, we can conclude that, the melting point determination may need improvement. It may not have been done properly, and we must make sure it is repeated at least once.
what is chemical formula of water ? how it is composed
Answer:
H2O
Explanation:
it is composed of 2 atoms of Hidro and 1 atom Oxy
Answer:
The chemical formula for water is H2O..it is composed by the bonding of 2 molecules of hydrogen and one molecule of oxygen,a covalent bond to be specific.
I hope this helps
Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O?
A.
2
B.
3
C.
5
D.
6
The answer is C. 5
Hope I helped
Plz help me with this question
Drawing of water molecular formulas
1.Draw molecular structure of water
Answer:
Here is your answer. I hope it will help you .wer the following questio What is meant by a solutio What is a saturated solutio Define: give an example.
Answer:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.
Explanation:
A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the contain
er.
Iron and chlorine form an ionic compound whose formula is FeCl3. The name of this compound is __________. Group of answer choices iron chlorine iron (III) chloride moniron trichloride iron (III) trichloride ferric trichloride
Answer:
Iron and chlorine form an ionic compound whose formula is FeCl3. The name of this compound is iron (III) chloride or iron trichloride.
Explanation:
Iron (III) chloride or Iron trichloride is also known as ferric chloride, it is a common compound of iron in the +3 oxidation state. The anhydrous compound is a crystalline solid with a melting point of 307.6 °C.
PLZ HELP ME WITH MY WORK
Answer:
c. H2 andO2
I think this is the answer not sure ok
hii pls help me to balance the equation and state the symbols thanksss
Answer:
First you have to write the chemical equation
Fe + Hcl----->FeCl2 + H
to balance this equation you have to put a 2 in front of hydrochloric acid and hydrogen
Fe + 2Hcl----->FeCl2 + 2H
I hope this helps
Answer:
I hope the above link will be of help
A piece of unknown metal with mass 68.6 g is heated to an initial temperature of 100 °C and dropped into 8.4 g of water (with an initial temperature of 20 °C) in a calorimeter. The final temperature of the system is 52.1°C. The specific heat of water is 4.184 J/g*⁰C. What is the specific heat of the metal?
0.171
0.343
1.717
3.433
Answer:
1.717
Explanation:
Consider these chemical equations.
N2(g) + 3H2(g) → 2NH3(g)
C(s) + 2H2(g) → CH4(g)
4H2(g) + 2C(s) + N2(g) → 2HCN(g) + 3H2(g)
Which equation(s) do you need to reverse in order to calculate the overall equation for the formation of HCN and H2 from NH3 and CH4? Check all that apply.
Answer:
A. N2(g) + 3H2(g) Right arrow. 2NH3(g)
B.C(s) + 2H2(g) Right arrow. CH4(g)
Explanation:
Answer:
a and b
Explanation:
second question
miultiplu second eq by 2
ayo could u help me out
what is mean by measurement
Answer:
Measurement is defined as the act of measuring or the size of something. An example of measurement means the use of a ruler to determine the length of a piece of paper. ... Extent, quality, or size as determined by measuring; dimension. A waist measurement of 32 inches.
Explanation:
The comparison o unknown quantity with known standard quantity is called measurement.
PLZ HELP ME WITH MY WORK
Answer:
neutrons should be added with the protons
what apparatus is used to investigate the conductivity of solutions
Molar mass of C^6H^12O^6
Answer:
The molar mass of C6 H12 O6 is 180.15588 g/mol.
Explanation:
Question 5
1.00 g of He, 14.0g F2, and 19.0 g Ar are placed in a 13.0-L container at 20.0 °C.
The total pressure (in atm) in the container is _____ atm.
1 point
Answer:
2.03 atm
Explanation:
Number of moles of He = 1g/4g/mol = 0.25 moles
Number of moles of F2 = 14.0g/38 g/mol = 0.37 moles
Number of moles of Ar=19.0g/40g/mol = 0.48 moles
Total number of moles = 0.25 + 0.37 + 0.48 = 1.1 moles
From;
PV=nRT
P= pressure of the gas mixture
V= volume of the gas mixture
n= total number of moles of the gas mixture
R= gas constant
T= temperature of the gas mixture
P= nRT/V
P= 1.1 × 0.082 × 293/13
P= 2.03 atm
When 4.2 gram of sodium bicarbonate reacts with 10.0 g of acetic acid, the product contains 2.2 g of carbon dioxide and residue cxontaining water and Sodium acetate. The mass of the residue will be:- *
Na2CO3+2HCl⟶2NaCl+H2O+CO2
Law of conservation of mass- It states that for any closed system, the mass of the system always remain constant over time, as mass of system cannot change. Therefore, (mass of Na2CO3+ mass of HCl) should be equal to (mass of residue + mass of CO2)
Mass of Na2CO3=4.2 g
Mass of HCl=10 g
Mass of residue =12 g
Mass of CO2=2.2 g
∴ Mass of Na2CO3+ Mass of HCl=14.2 g
and Mass of residue + Mass of CO2=14.2 g
Therefore, they follow law of conservation of mass.
Currently, nuclear energy provides only a small fraction (~10%) of energy used in the United States. In some other places, like France, it is close to 80%. Do you think nuclear energy will ever be a more widely used source of energy in the United States? Why or why not?
PLEASE HELP ASAP PLEASEEE
Nuclear energy is currently within almost every country becoming a growing source of energy use since it can provide a lot of energy within a short amount of time with little resources used to create it. It is quite possible that within the next few generations that nuclear energy could become a much larger source of energy within the United States. Although, many countries after the leak have resorted to other means of energy sources learning from the mistakes of Japan.
Hope this helps :)
A certain volume of gas S takes 180 secs to diffuse through a porous plug. An equal amount of gas Q takes 240 secs to diffuse the same plug. Calculate the molar mass of gas Q if the molar mass of gas S is 18.
Answer:
31.98g/mol
Explanation:
Using Graham's law of diffusion, which states that the rate of diffusion of a gas is inversely proportional to the square root of its molecular mass (M). Rate of diffusion = volume/time.
Since both gas S and Q have equal volumes, we can calculate molecular mass of gas Q as follows:
tQ/tS = √mQ /√mS
Where:
tQ = time of diffusion of gas Q
tS = time of diffusion for gas S
mQ = molar mass of gas Q
mS = molar mass of gas S
According to the information provided in this question;
tQ = 240s
tS = 180s
mQ = ?
mS = 18g/mol
Using tQ/tS = √mQ /√mS
240/180 = √mQ / √18
1.333 = √mQ / √18
Square both sides
1.333² = mQ/18
1.78 = mQ/18
mQ = 18 × 1.78
mQ = 31.98g/mol
Molar mass of Q = 31.98g/mol
For each pair (4), choose the stronger bond:
1. H–F (single bond) or H–Cl (single bond)
2. C–C (single bond) or C=C (double bond)
3. F–F (single bond) or H–F (single bond)
4. O=O (double bond) or C=C (double bond)
Answer:
line 3
Explanation:
let me know if you have any questions
25.Which of the following reaction will not take place?
A. Zn+ FeSO4 → ZnSO4 + Fe
C. Fe + NiSO4 → FeSO4 + Ni
B. 2Al + 3MgSO4→ Al2(SO4)3 + 3Mg D.
Cu + 2AgNO3 → Cu(NO3)2 + 2Ag
Answer:
B
Explanation:
because Mg is stronger than Al
What is reducing agent in the following reaction-
CuO + H2 ------>Cu + H2O?
A)CuO
B)Cu
C)H2O
D)H2
Answer:
H2
Explanation:
It helps to remove the oxygen
Answer:
It is H2. hope it helps if not sorry
what is precipitating ???
anyone please tell me how to delete an I'd
Explanation:
Desposition of solid matter in a solution
Balance the redox reaction by oxidation number or ion electron method and indicate oxidizing and reducing agent . KMno4 + KBr + H2SO4 approach K2SO4 + MnSO4 + H2O + Br2
Answer:
2KMnO₄ (aq) + 10KBr (aq) + 8H₂SO₄ (aq) -> 2MnSO₄ (aq) + 5Br₂ (aq) + 6K₂SO₄ (aq) + 8H₂O (l)
oxidizing agent = KMnO₄
reducing agent = KBr
Explanation:
KMnO₄ -> 2Mn⁷⁺ + 10e⁻ = 2Mn²⁺
KBr -> 10Br⁻⁺ - 10e⁻ = 10Br⁰
ASAP
Which of the following gases will have the highest rate of effusion at a given temperature?
Cl2
He
O2
Ne
Answer:
chlorine Will be at highest
How does knowing the reactants and
help you classify a chemical reaction?
if you know what kind of chemical a reactant is, it can help you to quickly distinguish the chemical reaction.
Ex:
HCl + KOH <---> KCl + H2O
We can look at the reactants and identify that this reaction is an acid-base reaction because HCl is an acid (it gave a proton) and KOH is a base (it accepted the proton)
Answer:
Products
Explanation:
I just got it right.
Vitamin C is a water-soluble vitamin, so your body doesn't store it. You have to get the required amount from your diet (citrus fruits are a great source!), or you could take a daily vitamin C supplement pill. Vitamin C is ascorbic acid, so to determine how much vitamin C (acid) has been placed in each pill, you could do an acid-base titration. One vitamin C pill was dissolved in water and titrated to an endpoint by 16.00 mL of a 0.447 M solution of NaOH. How many grams of ascorbic acid were there in the pill? (MW of ascorbic acid is 176.1 /mol). Explain and show your work.
Answer:
1.26 g
Explanation:
Number of moles of ascorbic acid = concentration × volume
Concentration = 0.447 M
Volume = 16.00 mL
Number of moles = 0.447 × 16/1000
Number of moles = 7.152 × 10^-3 moles
Number of moles= mass/molar mass
Molar mass of ascorbic acid = 176.1 g/mol
Mass = 7.152 × 10^-3 moles × 176.1 g/mol
Mass = 1.26 g
