Potassium acid phthalate will serve as our primary standard. This is a large molecule (KHC8H4O4) with a molar mass of 204.2 g/mol. Instead of writing the whole formula, we abbreviate it as KHP, where "P" stands for the phthalate ion, C8H4O42-, not for phosphorus. KHP is an acidic substance, with the ionizing hydrogen being set forward in the formula for emphasis. Therefore, KHP is monoprotic and will react with NaOH in a simple 1 to 1 relationship according to the following equation:
Two pieces of paper are stapled together.
Answer:
This is physical not chemical because a chemical example would be boiling water over the stove.
Explanation:
The thermite reaction occurs when iron(III) oxide reacts with solid
aluminum. The reaction is so hot that molten iron forms as a product.
>
Fe2O3(s) + Al(s) → Fe(C) + Al2O3(s)
What mass of aluminum should be used in order to completely
consume 10.0 g Fe2O3(s)? If the reaction described produces 5.3 g
Al2O3(s), what is the percent yield?
Answer:
[tex]m_{Al}=3.38gAl[/tex]
[tex]Y=83.1\%[/tex]
Explanation:
Hello.
In this case, for the given balanced reaction:
[tex]Fe_2O_3(s) + 2Al(s)\rightarrow 2Fe(s) + Al_2O_3(s)[/tex]
For 10.0 g of iron (III) oxide (molar mass = 160 g/mol), based on the 1:2 mole ratio with Al (atomic mass = 27 g/mol), the required mass is then:
[tex]m_{Al}=10.0gFe_2O_3*\frac{1molFe_2O_3}{160gFe_2O_3} *\frac{2molAl}{1molFe_2O_3} *\frac{27gAl}{1molAl} \\\\m_{Al}=3.38gAl[/tex]
Moreover, as 5.3 g of aluminum oxide are actually yielded, from the 10.0 g of iron (III) oxide, we can compute the theoretical mass of aluminum oxide (molar mass = 102 g/mol) via their 1:1 mole ratio:
[tex]m_{Al_2O_3}=10.0gFe_2O_3*\frac{1molFe_2O_3}{160gFe_2O_3} *\frac{1molAl_2O_3}{1molFe_2O_3} *\frac{102gAl_2O_3}{1molAl_2O_3} \\\\m_{Al_2O_3}=6.38gAl_2O_3[/tex]
Thus, the percent yield (actual/theoretical*100%) turns out:
[tex]Y=\frac{5.3 g}{6.38 g}* 100\%\\\\Y=83.1\%[/tex]
Best regards.
I would like some help on this please.
Answer:
Both b and c i think so... .
I think it is the dark blue tile because if it is not soluble, or insoluble, then it will not dissolve and you will still see it floating around in the liquid or at the bottom of the container.
Radio waves are examples of electromagnetic waves. T or F
Answer:
the answer is true
Explanation:
I really need help on this
..
Answer:
b
Explanation:
14. Identify the type of reaction: Pb + 2 AgCl → 2 Ag+ PbCl2
a. Combination/synthesis
b. Decomposition
c. Double replacement
d. Single replacement
What is the unbalanced force on a 1/2 kg object that causes it to accelerate 3 m/s2 to the right
Answer:
The answer is 1.5 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question we have
force = 0.5 × 3
We have the final answer as
1.5 NHope this helps you
Help me this, I only have 10 minutes to answer!!!!
Answer:sedimentary
Explanation:
Which of the following is the metric system based on?
How many grams of glycine amide should be added to 1.00 g of glycine amide hydrochloride to give 100 mL of solution with pH 8.00
Answer:
0.4235 g of glycine amide should be added
Explanation:
From the given information:
The equation of the reaction can be illustrated as:
[tex]BH^+ \to B^+ + H ^-[/tex]
where:
mass of glycine amide hydrochloride = 1.00 g
Suppose x be the amount of (in grams) of glycine amide that is required to be added; Then:
[tex][BH^+] = \dfrac{1.00 \ g}{110.54 \ gmol \times 0.100 L}[/tex]
[tex][BH^+]=[/tex] 0.0905 M
So, For [B} i.e, for glycine amide
[tex][B] = \dfrac{x \ g}{74.083 \ gmol \times 0.100 L}[/tex]
[B] = 0.135x M
∴
[tex]\dfrac{[B]}{[BH^+]}=\dfrac{0.135x \ M}{0.0905 \ M }}[/tex]
[tex]\dfrac{[B]}{[BH^+]}=1.49x[/tex]
The log of the above question can be computed as:
[tex]log _{10}\dfrac{[B]}{[BH^+]}=log _{10}1.49x[/tex]
[tex]pH = pK_a + log _{10} \dfrac{[B]}{[BH^+]}[/tex]
8.00 = 8.20 + [tex]log _{10}(1.49x)[/tex]
8.00 - 8.20 = [tex]log _{10}(1.49x)[/tex]
-0.20 = [tex]log _{10}(1.49x)[/tex]
1.49 x = [tex]10^{-0.20}[/tex]
1.49 x = 0.631
x = 0.631/1.49
x = 0.4235 g
sharpining a pencil leaves behind pencil shavings. Is sharpining a pencil a physical change a physical or chemical? Explain
Answer:
A physical change
Explanation:
Cause when sharpening a pencil the led stays as led and only changes the height of it not the composition of it
__is a term that refers to the amount of space that a substance or an object takes up
how are compounds with metallic bonds similar to ionic compounds?
Answer:
Metals do not form double and triple bonds in general because metals want to lose electrons, not share, in order to become stable, and both compounds have high melting ppints
Compounds with metallic bonds and ionic compounds are similar in their melting point and boiling point, conductivity, solubility in polar solvents etc.
Ionic compounds are chemical compounds that are formed by the electrostatic attraction between oppositely charged ions.
Compounds with metallic bonds and ionic compounds are similar in several ways. Some of the similarities are:
1. High melting and boiling points: Both metallic and ionic compounds have high melting and boiling points due to the strong forces that hold the atoms or ions together.
2. Conductivity: Both metallic and ionic compounds are good conductors of electricity due to the presence of charged particles that can move freely.
3. Brittle: Ionic and metallic compounds are generally brittle in nature, meaning that they are prone to breaking or shattering when subjected to stress.
4. Solubility in polar solvents: Both metallic and ionic compounds are generally soluble in polar solvents such as water, due to the polar nature of the molecules.
In conclusion, compounds with metallic bonds and ionic compounds share several similarities. Both have high melting and boiling points, are good conductors of electricity, are brittle, and are generally soluble in polar solvents.
Learn more about ionic compounds here:
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if two successive terms of the fibonacci sequence are both odd, is the next term is even or odd? why?
Answer:
Even because you always add the previous two terms in the sequence. Since they are both odd, the next term will be even. (odd+odd = even)
Explanation:
True or false: An oxidation number is not the same as an actual charge on an ion. True false question. True False
Answer:
True
Explanation:
They are actually the same
The answer is False.
The oxidation number is the number of electrons removed or added to an element or compound. This is also equal to the charge on the ion.
For example, if Sodium atom loses one electron, it becomes oxidized to the + 1 state.
Na → Na⁺ + e⁻.
So, the oxidation number of Sodium is the charge on the Sodium ion which is + 1.
So, the oxidation number is equal to the charge on the ion.
So, the answer is False.
Learn more about oxidation number here:
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How many total atoms are in 0.550 g of P2O5?
Answer:
Total atoms in 0.550g of =1.631x1022
Explanation:
answer is above
How many elements are shown in the diagram below for Hydrogen Peroxide?
Ten
Seven
Four
Two
Answer:4
Explanation:
4
What type of compound is iron(III) oxide?
Group A metal ionic compound with nonmetal anion
Group A metal ionic compound with polyatomic anion
transition metal ionic compound with polyatomic anion
transition metal ionic compound with nonmetal anion
Answer:transition metal ionic compound with nonmetal anion
Explanation:
Answer:
Your answer is going to be D. transition metal ionic compound with nonmetal anion
Hope this helps :)
1. Which of the following pairs of elements is most likely to share one or more pairs of electrons between
their nuclei?
a. Lithium and iodine
b. Sodium and lead
c. Copper and oxygen
d. Sulfur and chlorine
Answer:
d. Sulfur and chlorine.
Explanation:
A covalent bond is formed by two non-metals with similar electronegativities. As a consequence, they share one or more pairs of electrons between their nuclei.
Which of the following pairs of elements is most likely to share one or more pairs of electrons between their nuclei?
a. Lithium and iodine. NO. Lithium is a metal and iodine a non-metal.
b. Sodium and lead. NO. Both sodium and lead are metals.
c. Copper and oxygen. NO. Copper is a metal and oxygen is a non-metal.
d. Sulfur and chlorine. YES. Both are non-metals.
3.
What are valence electrons? How do you quickly determine the number of valence electrons an
atom has?
Answer:
Electrons that arent electrons
Explanation:
I teach chem
Answer:
Valence electrons are the electrons found in the highest and main energy level of the atom, being these responsible for the interaction between atoms of different species or between atoms of the same species. You can quickly determine these by looking at a periodic table like this one... Which is where the roman numbers come in and show the valence electrons. (THIS TABLE IS IN SPANISH, I hope you still recognize the symbols.) :))
In a certain chemical reaction, the bond energy of the products is 67 kJ and
that of the reactants is 52 kJ. Because energy is conserved, how much
potential energy does the system release or absorb?
O A. The reaction uses up 15 kJ of energy from the reaction system.
B. The reaction creates 15 kJ of energy when bonds form.
C. The reaction system absorbs 15 kJ of energy from the
surroundings.
O D. The surroundings absorb 15 kJ of potential energy.
D. The surroundings absorb 15 kJ of potential energy.
Further explanationChemical bonds = potential energy
ΔH reaction from bond energy is a breaking and forming reaction of the 2 reacting molecules
Can be formulated:
ΔH rxn = ∑ the energy of the reagent bonds broken - ∑ the energy of the bonds formed by the product
The bond energy of the products is 67 kJ and reactants 52 kJ
[tex]\tt \Delta H_{rxn}=52-67=-15~kJ[/tex]
ΔH = negative ⇒The reaction is exothermic(releases heat to surrounding)
Answer:
C is right
Explanation:
What do most mineral on Earth's surface contain?
Answer:
Explanation:
shallow sea
A shallow sea is best choice, although both are evaporites and would most likely be formed as either the sea evaporated, or in a playa setting (dry lake bed in a desert)
Answer:
oxygen and silicon
Explanation:
https://courses.lumenlearning.com/earthscience/chapter/minerals-and-mineral-groups/
"Nearly all (98.5%) of Earth’s crust is made up of only eight elements – oxygen, silicon, aluminum, iron, calcium, sodium, potassium, and magnesium – and these are the elements that make up most minerals."
Of available answers:
a) nitrogen and oxygen
b) sulfur and hydrogen
c) silicon and nitrogen
d) oxygen and silicon
Only oxygen and silicon are both included on the list
What of the following is made out of atoms? (HINT: vocabulary word "atom" or "matter") * 1 Air
2 Light
3 Energy
4 Sound
compare and contrast solids liquids and gases in terms of volume shape compessibility and energy
Answer:
solid has definite shape and volume.
liquid do not have definite shape but have definite volume.
gas do not have definite shape and definite volume.
solid have lowest compressibility out of three, liquid have more compressibility than solid but less than gases. gases have the highest compressibility out of three. Molecules in the solid phase have the least amount of energy, while gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles.
What would happen if I throw nail polish remover into the fireplace
Answer:
Your house could catch fire because while Nail Polish Remover itself isn't particularly flammable, the vapors it gives off are. Because of this, sparks could occur if nail polish is used near open flame or was tossed in, and then the sparks could catch onto something else and grow. I would not recommend trying this.
Explanation:
what is the hybridization of NO2
Answer: Explanation:
If we apply the hybridization rule then it states that if the sum of the number of sigma bonds, lone pair of electrons and odd electrons is equal to three then the hybridization is sp2.
What is the temperature, in degrees Celsius, of a 10.5 grams sample of Neon gas confined to a volume of 2.50 L at a pressure of 1.00 atm.
Answer:
–215 °C
Explanation:
From the question given above, the following data were obtained:
Mass of Ne = 10.5 g
Volume (V) = 2.50 L
Pressure (P) = 1 atm
Temperature (T) =?
Next, we shall determine the number of mole present in 10.5 gof Neon, Ne. This can be obtained as follow:
Mass of Ne = 10.5 g
Molar mass of Ne = 20 g/mol
Mole of Ne =.?
Mole = mass /Molar mass
Mole of Ne = 10.5 / 20
Mole of Ne = 0.525 mole
Next, we shall determine the temperature of the sample of Neon, Ne. This can be obtained as follow:
Volume (V) = 2.50 L
Pressure (P) = 1 atm
Number of mole (n) = 0.525 mole
Gas constant (R) = 0.0821 atm.L/Kmol
Temperature (T) =?
PV = nRT
1 × 2.5 = 0.525 × 0.0821 × T
2.5 = 0.525 × 0.0821 × T
Divide both side by 0.525 × 0.0821
T = 2.5 / (0.525 × 0.0821)
T = 58 K
Finally, we shall convert 58 K to degree celsius (°C). This can be obtained as follow:
T(°C) = T(K) – 273
T(K) = 58 K
T(°C) = 58 – 273
T(°C) = –215 °C
Thus, the temperature of the sample of Neon gas is –215 °C.
how did domestication of early crops start?
Answer:
In the Fertile Crescent in the Middle East, cereal crops were first domesticated about 11,000 years ago. Generally, the first domesticated crops were annuals with big seeds or fruits. ... Humans began to transition from a hunter-gatherer culture to a settled farming society as domestication took place.
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16. The diffusion rate of an unknown gas is measured to be 31.50 mL/min. Under
identical conditions, the diffusion rate of oxygen gas is measured to be 30.50
mL/min. Hint: diffusion rate is directly related to velocity.
Determine the identity of the unknown gas from the following options:
a. CH4
b. CO
C. NO
d. CO2
e. NO2
Answer:
Explanation:
[tex]\frac{r_1}{r_2} = \sqrt{\frac{M_2}{M_1} }[/tex]
r₁ and r₂ are rate of diffusion of gas having molecular mass of M₁ and M₂
[tex]\frac{31.5}{30.5} = \sqrt{\frac{32}{M_1} }[/tex]
1.0666 = 32 / M₁
M₁ = 30
molecular weight of NO = 14 + 16 = 30
So the unknown gas is NO .
At what time was the frog sitting still or at rest
Answer:
What are the times and is that your question?
Explanation: