The correct answer is C
Joe and Ross should respond to Janice by saying that Zit B Gone was not effective because the blemishes reappeared.As the blemishes reappeared there could possibly be an error in their results.
What is an error?Errors in chemical analysis result when there is a difference between observed value and the true value.If the magnitude of errors is large , it results in decrease in accuracy, reproducibility, and precision.
There are three types of errors:1) random error 2) systematic error 3) human error.The cause of random errors are difficult to quantify while the human errors can be minimized by taking a range of readings to reduce the error.
Errors while measuring boiling point may be human errors while noting down the boiling temperature or instrumental or systematic error if there is a fault in the thermometer.
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What is the mass in grams of 100 atoms of carbon?
(Enter the number in scientific notation with units!)
Hello!
To find the mass in grams of 100 atoms of carbon, we need to use Avogadro's number, which is 6.02 x 10^23 grams, and divide that by the total number of atoms.
Next, we would need to find how much one mole of carbon weighs. In this case, it is exactly 12 grams.
1. Divide by Avogadro's number
100 / (6.02 x 10^23) ≈ 1.66 x 10^-22
2. Multiply by one mole of carbon
(1.66 x 10^-22) x 12 ≈ 2.0 x 10^-21
Therefore, the mass of 100 atoms of carbon is equal to about 2.0 x 10^-21 grams.
1. Find the elements magnesium, cesium, and nitrogen on the periodic table. a. What monoatomic ions would each form? Write this with the appropriate symbol abbreviation. Be sure to use subscripts or superscripts as necessary. Example: Al3+ (5 points) b. Then, given what you know about chemical bonding, give the formulas for the types of ionic compounds they would produce with each other. Be sure to use subscripts or superscripts as necessary. Explain how you determined this. No credit without an explanation. (10 points)
a. Monatomic ions
Cs is in Group 1. It has one valence electron that it can lose to form a Cs⁺ ion.
Mg is in Group 2. It has two valence electrons that it can lose to form an Mg²⁺ ion.
N is in Group 15. It can gain three valence electrons to complete its octet and form an N³⁻ ion.
b. Ionic compounds
In an ionic compound there must be the same number of positive and negative charges.
It takes three Na⁺ ions to balance the charge on one N³⁻ ion, so the formula of sodium nitride is Na₃N.
It takes three Mg²⁺ ions (charge = +6) to balance the charge on two N³⁻ ions
(charge = -6), so the formula of magnesium nitride is Mg₃N₂.
Magnesium forms a Mg²⁺ cation, cesium forms a Cs⁺ cation, and nitrogen forms an N³⁻ anion. Magnesium nitride, cesium nitride, and magnesium ceside are the ionic compounds formed, with formulas Mg₃N₂, Cs₃N, and MgCs₂, respectively. Ionic compounds must have balanced total charges.
1. (a). First, let's identify the ions that each element forms:
Magnesium (Mg) is in Group 2 of the periodic table and forms a cation by losing two electrons: Mg²⁺. Cesium (Cs) is in Group 1 and forms a cation by losing one electron: Cs⁺. Nitrogen (N) is in Group 15 and forms an anion by gaining three electrons: N³⁻.
1. (b). Next, let's determine the formulas of the ionic compounds these ions can form:
Magnesium Nitride (Mg₃N₂): Magnesium (Mg²⁺) and nitrogen (N³⁻) combine in a 3:2 ratio to balance the total charges.Cesium Nitride (Cs₃N): Cesium (Cs⁺) and nitrogen (N³⁻) combine in a 3:1 ratio to balance the total charges.Magnesium Ceside (MgCs₂): Magnesium (Mg²⁺) and cesium (Cs⁺) combine in a 1:2 ratio to balance the total charges.To determine the formulas, I considered the need for ionic compounds to be electrically neutral, meaning the total positive and negative charges must equal zero.
How can we increase the rate of collisions between the reactants in this reaction?
Mg + 2HCl → MgCl2 + H2
A.
Increase the concentration of H2 in the reaction mixture.
B.
Decrease the temperature of the reactants in the reaction mixture.
C.
Increase the concentration of Mg in the reaction mixture.
D.
Decrease the temperature of the entire reaction mixture.
E.
Decrease the concentration of HCl in the reaction mixture.
Answer: Option (C) is the correct answer.
Explanation:
According to collision theory, more is the number of collision between the reactant molecules more will be the rate of reaction.
For example, [tex]Mg + 2HCl \rightarrow MgCl_{2} + H_{2}[/tex]
When we increase the concentration of reactants then it means there is increase in number of molecules. Hence, more is the number of molecules more will be the number of collisions.
Thus, we can conclude that by increasing the concentration of Mg in the reaction mixture we increase the rate of collisions between the reactants in this reaction.
Answer:
C. Increase the concentration of Mg in the reaction mixture.
Explanation:
What is the temperature of 0.500 moles of a gas that is stored in a 2.50 L container under 13.0 atm of pressure?
Moles of a gas = 0.500
Volume = 2.50 L
Pressure = 13. atm
Temperature = ?
Solution:
Formula:
PV = n RT
Putting the values in formula:
T = PV/nR = 13 * 2.5 / 0.5 * 0.082057
= 32.5/0.041 = 792.68 K
T = 792.68 K
In a given substance, as the temperature of a substance increases, the volume of that substance
A. decreases
B. fluctuates
C. increases
D. is not affected
It decreases right?
In your own words, describe what is the role or function of the neutron in the atom's nucleus
Neutrons are very important in provide stability for an atom. When atoms are created by fusion, neutrons are included in this process. Because protons don't like each other and repel each other that's where neutrons come in.
answer: the role of a neutron in an atom holds the center of the atom so it provides the stability of the center of the atom.
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Which process must occur for a muscle to be able to relax? A. The concentration of calcium in the myofibril must decrease. B. The amount of ATP in the neuromuscular junction must increase. C. a nerve must initiate an action potential in the muscle fiber. D. Myosin and actin must attach to each other.
The correct option is A. which is the concentration of calcium in the myofibril must decrease.
Explanation:Calcium allows the actin, myosin, and ATP to interact, causing cross bridge formation and muscle contraction. Muscle relaxation occurs when calcium is pumped back into the sarcoplasmic reticulum, away from the actin and myosin. When calcium moves in this way, the actin and myosin cannot interact, and the muscle relaxes.So according to above information all option are wrong except A option.The question:A new grill has a mass of 30.0 kg. You put 2.0 kg of charcoal in the grill. You burn all the charcoal and the grill has a mass of 30.0 kg. What is the mass in kg of the gases given off? (assume that the charcoal is pure carbon solid and that it burns completely in oxygen).
The answer: Mass of carbon burnt = 2Kg = 2000g
Moles of Carbon burnt = 2000/12
=> Moles of CO2 produced = 2000/12
=> Mass of CO2 produced = 2000/12*44 = 2 333.33 g = 2.33 Kg
In the answer, where did the 44 come from?
Answer:- Molar mass of [tex]CO_2[/tex] .
Solution:- It is a stoichiometry problem. Mass of the grill is 30.0 kg and the mass after burning the grill is also 30.0 kg. It means all the charcol is burned and the gas is given off.
2.0 kg of charcol are converted to grams which is 2000 g. Since charcol is pure solid carbon, the grams are divided by the atomic mass of carbon which is 12.
The combustion equation of charcol is written as:
[tex]C(s)+O_2(g)\rightarrow CO_2(g)[/tex]
From this balanced equation, there is 1:1 mol ratio between charcol and carbon dioxide. So, the moles of carbon dioxide gas formed are equivalent to the moles of charcol. To convert the moles of carbon dioxide to grams we multiply the moles by it's molar mass.
Carbon dioxide has one carbon and two oxygen atoms so it's molar mass = 12 + 2(16) = 12 + 32 = 44
So, 44 is the molar mass of carbon dioxide and above calculations clearly shows how and where we get this.
Alfred wegener suggested that earths continents are moving. Which evidence support this theory
Close geometric correspondence of continental coastlines.
Explanation:The main supporting clues that Wegener used were the geomorphological shape of the opposing continents across the Atlantic. Further evidence derived from the study of the continental shelf below the sea; the matching geometry is even better than the one of the emerged shoreline.Another strong supporting evidence is the presence of rocks of identical geological origin on different continents. It is actually possible to follow the strata limits on landmasses that now are separated by oceans. It is a strong clue that once these masses belonged to the same continent.Answer:
As explained below
Explanation:
Alfred Wegener was the first to give the continental plate theory in 1912 and IT gained popularity in 1950 onwards when the publication came from the geologist and other scientists that proved that continent are spreading and as seafloor is itself moving and the evidence that he gave doe the theory are given as below.1. Drifting away from the continents due to the pole wandering forces.
2. Jigsaw ft puzzle that coasts of South America and those of Africa have the same geologic and tectonic origin.
3. Presence of large and long mountain chains of mountains and ranges present in all the contents that form a chain.
4. Floral and Faunal evidence found in the lands of South America and Africa and the opening of the s-shaped Atlantic ocean that separated them apart.
5. Presence of similar climatic zones over the continents of the Gondwanaland and the northern Laurentia continent.
The seafloor spreading supports the evidence by the study of paleomagnetism and the age of rocks.Consider the reaction.

At equilibrium, the concentrations of the different species are as follows.
[H2O] = 0.077 M
[Cl2O] = 0.077 M
[HClO] = 0.023 M
What is the equilibrium constant for the reaction at this temperature?
0.089
0.26
3.9
11
Answer:
0.089.
Explanation:
For the equilibrium reaction:Cl₂O + H₂O ⇄ 2HClO,
Kc = [HClO]²/[Cl₂O][H₂O].
[H₂O] = 0.077 M , [Cl₂O] = 0.077 M , [HClO] = 0.023 M.
∴ Kc = [HClO]²/[Cl₂O][H₂O] = (0.023 M)²/(0.077 M)(0.077 M) = 0.08922 ≅ 0.089.
Answer:
A
Explanation:
It told me
When two plates with continental crust converge, why are neither of them subducted
Neither plate subducts because the crust have approximately the same density. Instead, the rocks are smashed together causing them to recrystallize due to the intense heat and pressure from the colliding plates.
When 8g fully reacts with 12g how many grams of sodium flourine form
Why are a molecules atoms as far away from each other as they can get
Explanation:
An atom consists of electrons, protons, and neutron. The protons and neutrons are present inside the nucleus whereas the electrons are present outside the nucleus.
These electrons revolve around the nucleus in circular motion. Therefore, an electron pair surrounds the central atom of a molecule. It is known that an electron contains a negative charge and like charges repel each other.
Hence, in an atom the force of repulsion between electron pairs pulls the atoms away from each other.
As a result, a molecules atoms are as far away from each other as they can get.
Answer:
forces between electron pairs push the atom apart
Explanation:
apex
Out of the following, which element has properties of both metal and nonmetal?
A.
Ce
B.
Be
C.
Te
D.
Ne
A toxic gas. a, consists of 53.8% nitrogen and 46.2% carbon by mass. at 273 k and 1.01 x 10^5 pa, 1.048g of a occupies 462 cm^3. determine the empirical formula of
a. calculate the moral mass of the compound and determine its molar mass
By the mass percentage, [tex]100[/tex] grams of the sample would contain
[tex]53.8 \; \text{g}[/tex] of nitrogen, and[tex]46.2 \; \text{g}[/tex] of carbon.Which corresponds to
[tex]53.8 / 14.01 \approx 3.84 \; \text{mol}[/tex] of nitrogen atoms, and[tex]46.2 / 12.01 \approx 3.85 \; \text{mol}[/tex] of carbon atoms.Hence the approximate ratio [tex]n(\text{N}) : n(\text{C}) \approx 1 : 1[/tex] and the empirical formula [tex]\text{CN}[/tex].
Apply the idea gas formula to determine the number of moles of the gas molecules present in the [tex]462 \; \text{cm}^{3} = 0.462 \; \text{L} [/tex] sample:
[tex]\begin{array}{lll}n &= & (\text{P}\cdot \text{V}) / (\text{R} \cdot \text{T})\\ & = & 1.01 \times 10^2 \times 0.462 /(8.314 \times 273) \\ &= &0.0206\; \text{mol}\end{array}[/tex]
Thus
[tex]M = m / n = 1.048 / 0.0206 = 51.0 \; \text{g} \cdot \text{mol}^{-1}[/tex]
which is approximately twice of [tex]26.02\; \text{g} \cdot \text{mol}^{-1}[/tex], formula mass for the empirical formula [tex]\text{CN}[/tex]. Hence the molecular formula [tex]\text{C}_2\text{N}_2[/tex]
The molecular formula of the compound is C2N2.
From the ideal gas equation;
PV = nRT
P = 1.01 x 10^5 Pa or 1.01 atm
V = 462 cm^3 or 0.462 L
R = 0.082 atm Lmol-1K-1
T = 273 K
n = ?
n = PV/RT
n = 1.01 atm × 0.462 L/ 0.082 atm Lmol-1K-1 × 273 K
n =0.467 /22.386
n = 0.02086 moles
Now;
Molar mass of the compound is obtained from;
number of moles = mass/molar mass
molar mass = mass/number of moles
molar mass = 1.048g/0.02086 moles
molar mass = 50.24 g/mol
The empirical formula of the compound is;
C - 53.8%/12, N - 46.2%/14
C - 4.48, N - 3.3
Dividing through by the lowest ratio
C -4.48/3.3 N - 3.3/3.3
C - 1 N - 1
The empirical formula is CN
The molecular formula is obtained thus;
[12 + 14]n = 50.24
n = 50.24/26
n = 2
The molecular formula of the compound is C2N2
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25pts! which of the following has the largest atomic radius mg mg2+ ca or ca2+
Ca has the largest atomic radius because it is further down the periodic table than Mg, and its cation, Ca²⁺, is still larger than Mg²⁺ because it retains an extra shell of electrons.
The atomic radius tends to increase as you move down a group in the periodic table because each successive element has an additional energy level, or shell. Conversely, atomic radius generally decreases as you move from left to right across a period because the effective nuclear charge increases, pulling the electrons closer to the nucleus. In the case of ions, cations (positively charged ions) are smaller than their neutral atoms because they have lost one or more electrons, reducing electron-electron repulsion and allowing the electrons to be pulled closer to the nucleus.
In comparing Mg, Mg²⁺, Ca, and Ca²⁺, we must remember that the neutral atoms will have a larger atomic radius than their respective cations. Between Mg and Ca, Ca is larger because it is lower on the periodic table. However, for the cations, Ca²⁺ is larger than Mg²⁺ because even though they have both lost two electrons, the calcium ion still has an additional shell of electrons compared to magnesium.
Therefore, among the given species, Ca has the largest atomic radius followed by Mg, then Ca²⁺, and finally Mg²⁺ having the smallest atomic radius.
Answer: ca
Explanation: .
what ion is formed when an atom of magnesium (mg) loses two electrons? mg–1 mg–2 mg 1 mg 2
Answer:
Mg+2 Its D
Explanation:
DDDDDDDDDDDDDDDDDD on edge 2020
Answer:
Its D.
Explanation:
Got it correct in the question.
1. Define fission and fusion. Give an example of fission and fusion reflecting in real life application.
Answer :
Nuclear fission : In nuclear reaction, the nucleus of a larger atom breaks into two or more smaller nuclei. In fission process, protons and neutrons are produced and larger amount of energy is released.Example : In nuclear power plant, the energy released from the process of nuclear fission which is converted into electrical energy that is used in our homes and factories.
Nuclear fusion : In nuclear reaction, the nuclei of two or more smaller atoms combine together to form single larger molecule. In fusion process, the mass of the resulting nuclei is more as compared to the starting nuclei and large amount of energy is also released.Example : This process occurs in the sun and stars. In this, the isotopes of Hydrogen, Tritium and Deuterium combine together to form a neutron and a helium atom under high pressure and temperature.
A student mixes four reagents together, thinking that the solutions will neutralize each other. The solutions mixed together are 50.0 ml of 0.100 m hydrochloric acid, 100.0 ml of 0.200 m of nitric acid, 500.0 ml of 0.0100 m calcium hydroxide, and 200.0 ml of 0.100 m rubidium hydroxide. Is the resulting solution neutral? If not, calculate the concentration of excess h or oh? Ions left in solution.
Answer: Resulting solution will not be neutral because the moles of [tex]OH^-[/tex]ions is greater. The remaining concentration of [tex][OH^-][/tex]ions =0.0058 M.
Explanation:
Given,
[HCl]=0.100 M
[tex][HNO_3][/tex] = 0.200 M
[tex][Ca(OH)_2][/tex] =0.0100 M
[RbOH] =0.100 M
Few steps are involved:
Step 1: Calculating the total moles of [tex]H^+[/tex] ion from both the acids
moles of [tex]H^+[/tex] in HCl
[tex]HCl\rightarrow {H^+}+Cl^-[/tex]
if 1 L of [tex]HCl[/tex]solution =0.100 moles of HCl
then 0.05L of HCl solution= 0.05 [tex]\times [/tex]0.1 moles= 0.005 moles (1L=1000mL)
moles of [tex]H^+[/tex] in HCl = 0.005 moles
Similarliy
moles of [tex]H^+[/tex] in [tex] HNO_3[/tex]
[tex]HNO_3\rightarrow H^++NO_3^-}[/tex]
If 1L of [tex]HNO_3[/tex] solution= 0.200 moles
Then 0.1L of [tex]HNO_3[/tex] solution= 0.1 [tex]\times [/tex] 0.200 moles= 0.02 moles
moles of [tex]H^+[/tex] in [tex]HNO_3[/tex] =0.02 moles
so, Total moles of [tex]H^+[/tex] ions = 0.005+0.02= 0.025 moles .....(1)
Step 2: Calculating the total moles of [tex][OH^-][/tex] ion from both the bases
Moles of [tex]OH^-\text{ in }Ca(OH)_2[/tex]
[tex]Ca(OH)_2\rightarrow Ca^2{+}+2OH^-[/tex]
1 L of [tex]Ca(OH)_2[/tex]= 0.0100 moles
Then in 0.5 L [tex]Ca(OH)_2[/tex] solution = 0.5 [tex]\times [/tex]0.0100 moles = 0.005 moles
[tex]Ca(OH)_2[/tex] produces two moles of [tex]OH^-[/tex] ions
moles of [tex]OH^-[/tex] = 0.005 [tex]\times [/tex] 2= 0.01 moles
Moles of [tex]OH^-[/tex] in [tex]RbOH[/tex]
[tex]RbOH\rightarrow Rb^++OH^-[/tex]
1 L of RbOH= 0.100 moles
then 0.2 [RbOH] solution= 0.2 [tex]\times [/tex] 0.100 moles = 0.02 moles
Moles of [tex]OH^-[/tex] = 0.02 moles
so,Total moles of [tex]OH^-[/tex] ions = 0.01 + 0.02=0.030 moles ....(2)
Step 3: Comparing the moles of both [tex]H^+\text{ and }OH^-[/tex] ions
One mole of [tex]H^+[/tex] ions will combine with one mole of [tex]OH^-[/tex] ions, so
Total moles of [tex]H^+[/tex] ions = 0.005+0.02= 0.025 moles....(1)
Total moles of [tex]OH^-[/tex] ions = 0.01 + 0.02=0.030 moles.....(2)
For a solution to be neutral, we have
Total moles of [tex]H^+[/tex] ions = total moles of [tex]OH^-[/tex] ions
0.025 moles [tex]H^+[/tex] will neutralize the 0.025 moles of [tex]OH^-[/tex]
Moles of [tex]OH^-[/tex] ions is in excess (from 1 and 2)
The remaining moles of [tex]OH^-[/tex] will be = 0.030 - 0.025 = 0.005 moles
So,The resulting solution will not be neutral.
Remaining Concentration of [tex]OH^-[/tex] ions = [tex]\frac{\text{Moles remaining}}{\text{Total volume}}[/tex]
[tex][OH^-]=\frac{0.005}{0.85}=0.0058M[/tex]
How many hydrogen atoms are in 2.30 mol of ammonium sulfide
1] Find out how many moles
2] Use Avagadro's number to find number of molecules
1] [2.3 g (NH4)2SO4] x [1 mol (NH4)2SO4] / [132.14g(NH4)2SO4 )] = 0.017406 moles (NH4)2SO4
2] 0.017406 moles x 6.022 x 10^23 molecules/mole = 1.05 x 10^21 molecules (NH4)2SO4
Which element is oxidized in the following reaction: CuO(s) + H2 (g) → Cu(s) + H2O (l)
Start by determining the oxidation numbers of each element on both sides of the equation CuO(s) + H2 (g) → Cu(s) + H2O (l)
Let's start with the reactants.
In the compound CuO(s), the oxidation number of O is -2 and the oxidation number of Cu is +2. (Remember, oxygen's oxidation number is -2 unless it's in a peroxide)
In H2(g) the oxidation number of H is 0 because it is in its elemental form.
Now onto the products
The oxidation number of Cu(s) is 0 because it is in its elemental form
In H2O(l) the oxidation number of oxygen is -2, and the oxidation number of H is +1.
Now let's summarize the change in the oxidation numbers of each element.
Cu: started as +2 and became 0
O: started as -2 and became -2 (didn't change)
H: started as 0 and became +1
To determine which element was oxidized, we look at which element lost electrons, and thus became more positive. So, we can determine that H was oxidized in this reaction, because it started with the oxidation number 0 and became +1.
Answer: you are a god
Explanation:
What kind of reactions provide a star with energy?
The nuclear fusion reaction is the source of energy in a star. In nuclear fusion reactions, the nuclei of two atoms combine to create a new atom with the release of a lot of energy. The nuclear fusion reaction takes place in the core of the star where two hydrogen atoms fuse to become one helium atom.
²₁H + ³₁H --> ⁴₂He + ¹₀n + 17.59 MeV
In the fusion reaction above deuterium fuses with tritium to form helium and releases ~18 mega electron volt of energy.
What are the natural components of water?
two hydrogen atoms and one oxygen atom. hope this helped.
Jon performs the following calculation. (1)(2.0)(3.00)(4.000) Which value from his calculation most strongly affects the number of significant figures in the answer?
Jon should report his answer to one significant digit only.
When several numbers are multiplied, the number of significant digits in the final answer is determined by the number that has the least number of significant digits.
In this case, 1 has only one significant digit, whereas 2.0 has two, 3.00 has three, and 4.000 has four significant digits. Hence, 1 strongly affects the number of significant figures in the answer.
Answer: A. for those who dont like to read
Explanation:
What are found on the left side or the arrow in a chemical reaction
A compound is used as a food additive. The compound has a molar mass of 176.124 grams/mole. A 692.5-gram sample undergoes decomposition, producing 283.4 grams of carbon, 31.7 grams of hydrogen, and 377.4 grams of oxygen. What is the molecular formula of the compound?
A. C3H4O3
B. C4H8O4
C. C6H6O6
D. C6H8O6
E. C6H8O8
Here we have to get the correct molecular formula of the compound.
The molecular formula of the compound is C₆H₆O₆ i.e. option C.
Let assume, the empirical formula of the compound is [tex](CHO)_{n}[/tex].
The given molar mass of the compound is 176.124 g/mole.
The percent of carbon in the compound is [tex]\frac{283.4}{692.5}[/tex]×100 = 40.924.
The percent of hydrogen in the compound is [tex]\frac{31.7}{692.5}[/tex]×100 = 4.577.
The percent of oxygen in the compound is [tex]\frac{377.4}{692.5}[/tex]×100 = 54.498.
Now the ratio of the atomic number in the compound for carbon is [tex]\frac{40.924}{12}[/tex] = 3.410
Now the ratio of the atomic number in the compound for hydrogen is [tex]\frac{4.577}{1}[/tex] = 4.577
Now the ratio of the atomic number in the compound for oxygen is [tex]\frac{54.498}{16}[/tex] = 3.406
So, the C, H and O lowest ratio is [tex]\frac{3.410}{3.406}[/tex] = 1, [tex]\frac{4.577}{3.406}[/tex] = 1 and [tex]\frac{3.406}{3.406}[/tex] = 1
Thus the empirical formula of the compound is [tex][CH_{1}O] _{n}[/tex] (where n = integer.
12n + 1n + 16n = 176.24
29n = 176.24
n = 6 (approx)
Thus the molecular formula of the compound is C₆H₆O₆.
Final answer:
By calculating the number of moles of carbon, hydrogen, and oxygen and deriving the ratio among them, it is determined that the molecular formula of the compound with a molar mass of 176.124 grams/mole is C6H8O6 (D).
Explanation:
To find the molecular formula of the compound used as a food additive with a molar mass of 176.124 grams/mole from the given decomposition data, we first need to calculate the number of moles of each element present in the given sample.
For carbon: (283.4 g) / (12.0 g/mol) = 23.62 moles
For hydrogen: (31.7 g) / (1.0 g/mol) = 31.7 moles
For oxygen: (377.4 g) / (16.0 g/mol) = 23.59 moles
Next, we divide by the smallest number of moles to get the atom ratio.
C: 23.62 / 23.59 ≈ 1
H: 31.7 / 23.59 ≈ 1.34
O: 23.59 / 23.59 = 1
The ratio of hydrogen is not a whole number, so we multiply all ratios by the smallest whole number that gives us whole number ratios for each element, which in this case would be 3 (since 1.34 is approximately 4/3).
After multiplying, the moles of each element become:
C: 1 x 3 = 3
H: 1.34 x 3 ≈ 4
O: 1 x 3 = 3
Thus, the empirical formula of the compound is C3H4O3, and the molecular formula is the same as the empirical formula because the molar mass of C3H4O3 (3(12.0) + 4(1.0) + 3(16.0) = 88.0 g/mol) is half that of the given molar mass. Therefore, the molecular formula must be C6H8O6, which is twice the empirical formula.
The correct molecular formula of the compound is D. C6H8O6.
Which of these accurately describes the products of a reaction?
Question 2 options:
new substances that are present at the end of a reaction
substances that were not used up in a reaction
substances that are used in a reaction
substances that do not participate in a reaction
What is the quantity 456 milligrams converted to grams? Use the table below to help you.
A. 0.000456 g
B. 0.456 g
C. 4.56 g
D. 456, 000 g
Answer:
B.0.456 g
Explanation:
It is that becuase if u convert miligrams to grams it is 1000mg =1g
CHEMISTRY
IS DIS B OR C ????
#2
Select the atomic models that belong to the same element.
Srry if I'm late the answer to the first question about chemical changes is B. when a new substance is formed, it's going to be chemical. For example, when you burn paper, it turns into ash, which is a new substance. The burning is a chemical change. C is wrong because you can undo the mixture.
For number 2, the trick is to check if there is a carbon is double bonded to another carbon. Then it would be unsaturated. You can also check if there's a kink the chain. So therefore,
saturated is 3-methl.. and propane
unsaturated is propyne heptyne and cyclpentene
good luck!
The statement that describes a Chemical changes in hematite is B. The hematite particles rearrange to form a new substance.
The statement that describes a chemical change in hematite is B. The hematite particles rearrange to form a new substance.
A chemical change involves the formation of new substances with different chemical properties.
In this case, the rearrangement of hematite particles leads to the formation of a new substance.
Example: When hematite (Fe2O3) is heated strongly, it undergoes a chemical change and turns into magnetite (Fe3O4).
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The main function of concept mapping is:
A.Memorization incorrect answer
B.Communication incorrect answer
C.Organization incorrect answer
D.Simplification incorrect answer
The main function of concept mapping is: C. Organization
A map can be defined as a representation of all or some parts of the Earth drawn to scale on a flat surface.
In Science, there are different types of map and these include;
A political map.A thematic map.A topographic map.A special purpose map.A concept map.A concept map can be defined as a visual representation of information and ideas, so as to depict (illustrate) the relationships between two or more concepts while organizing them.
Hence, main function of concept mapping is for the proper organization or structuring of information and ideas in a graphic format.
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