Answers
Answer: Lithium
Explanation:
The ratio for the reaction of Li and water is the same, but there are more moles of water than lithium. Therefore, lithium is the limiting reactant.
Related Questions
Pre-Lab Assignment
1.
Describe the following trends in properties of oxides across Period 3.
(a)
(b)
Their appearance.
Their volatility
Their structure.
Their acid-base character
Their conductivity
(d)
Answers
Answer:
See explanation
Explanation:
From left to right, the oxides across period 3;
i) Period 3 oxides all appear white in colour. They are all crystalline solids and their melting points decrease from left to right.
ii) The volatility of period 3 oxides increases from left to right across the periodic table
iii) The metallic oxides on the right hand side adopt giant ionic structures. Silicon oxide which is in the middle of the period forms a giant covalent structure. Oxides of other elements towards the right hand side form molecular oxide structures.
iv) The acidity of oxides of period 3 increases from left to right. Metals on the left hand side form basic oxides while non-metals on the right hand side form acidic oxides. The oxide of aluminium in the middle is amphoteric.
v) The oxides of period 3 elements do not conduct electricity. However, the metallic oxides on the lefthand side conduct electricity in molten state. The non-metallic oxides on the right hand side are molecular hence they do not conduct electricity under any circumstance.
Which molecule or ion below would be expected to have a trigonal planar electron domain geometry?
a. nitrate ion, NO3 1-
b. at least two of these
c. carbon tetrachloride
d. water
e. sulfur dioxide
Answers
Answer:
a. nitrate ion
e. sulfur dioxide
Explanation:
Trigonal planar geometry, is possible, where the combination of atoms or lone pain form a triangle which is is same plane.
Hence, from the given options,
Nitrate ion has a trigonal planar geometry.Carbon tetrachloride has a teterahedral geometrywater has a bent angular geometry.sulfur dioxide has a trigonal planar geometry.Therefore,
From the given options, the correct answer is -
a. nitrate ion
e. sulfur dioxide
NASA pointed the Hubble Space Telescope at a very dark section of sky to see what might be found. The telescope revealed
about 10,000 distant and never-before-seen galaxies. NASA would have to make observations of more than 10,000,000
other sections to study the rest of the sky. If every section of sky also looked out on 10,000 galaxies, about how many
galaxies would exist in the known universe?
100,000,000
1,000,000,000
10,000,000,000
100,000,000,000
Hel
Answers
Answer:
100,000,000,000
Explanation:
Given that :
1 hubble space telescope pointed at 1 section of the sky reveals 10,000 distinct galaxies ;
Number of sections from which observation is to be made = 10,000,000
Number of distinct galaxy per section = 10,000
Number of galaxies that would exist in the known universe :
Total number of galaxies in the known universe :
Number of galaxies per section * number of sections
10,000 * 10,000,000
= 100,000,000,000s
Fish and reptiles share which of these traits?
A
They live in water,
B
They are cold blooded,
С
They do not have scales,
D
They do not have backbones,
Answers
If water itself does not conduct electricity, then why is it dangerous to be in water during a
thunderstorm OR use electricity in a bathtub?
Answers
Electricity can flow through water (so don't swim with a toaster plugged in or at all)
2 Pb(NO3)2(s) → 2 PbO(s) + 4 NO2(g) + O2(g)
15. Solid lead(II) nitrate can be decomposed by heating. If an actual yield of 5.51 g PbO product is
recovered by heating 9.90 g Pb(NO3)2. what is the percent yield of PbO in the decomposition
reaction?
A 98.0%
B. 82.6%
C. 78.49
D. 55.79
Answers
Answer:
b
Explanation:
1. Complete the following sentences:
(a) Oxidation is a gain of electrons OR an increase in oxidation state
(b) Reduction is a loss of electrons OR a decrease in oxidation state
(c) Redox reactions involve a transfer of electrons from the element being _______________ to the element being ________________.
2. Complete the rules for assigning oxidation numbers by filling in the missing words.
(1) The oxidation number of an element is .
(2) The oxidation number of a monatomic ion is equal to the of the ion.
(3) In a polyatomic ion, the oxidation numbers of all the atoms in the ion add up to the
of the ion.
(4) In a compound, the sum of all the oxidation numbers of the atoms is
(5) The oxidation number of oxygen in its ions and compounds is always
except in where it is -1.
(6) The oxidation number of hydrogen in its ions and compounds is always
(7) The oxidation number of elements in compounds is often the same as their __________ if they were an ion
3. Give the oxidation number of the bold species in each of the following substances.
H2O S8 H2O2
AlCl3 O3 Fe2O3
MnO2 Cu KMnO4
4. Give the oxidation number of the bold species in each of the following substances.
Br- S2O32- NH4+
H2S MnO4- Cr3+
O22- Cr2O72- I-
C2O42- NO3- OCl-
SO42- MnO2 SO2
.
5. State the oxidation number of the underlined element in each of the following species.
(a) HCl (j) FeSO4
(b) CO2 (k) Fe2(CO3)3
(c) SO32- (l) KMnO4
(d) CO (m) MnI2
(e) KI (n) CaO
(f) H2O2 (o) Cr2O72-
(g) Cr(NO3)3 (p) HSO3-
(h) Br2 (q) ZnO
(i) H2SO4 (r) H2O
6. State whether each of the following reactions is an oxidation or a reduction reaction. Justify.
(a) O2- → O2
(b) I2 → I-
(c) Mg2+ → Mg
(d) HSO3- → SO42-
(e) Fe3+ → Fe2+
(f) Br2 → Br-
(g) Cr2O72- → Cr3+
(h) MnO4- → Mn2+
(i) Cl2 → Cl-
(j) H+ → H2
Answers
2. 3
3. 6
4. 2
5. D, E
6. E,f,g
which statements describe the relationship between the area and the bioversity
Answers
?????????????????????????????????????????
It is almost time to explain to the people of Westfield how the rust in their water formed. What have you learned so far about how new substances form?
Answers
Answer:Commons-emblem-question book orange.svg
Este artículo o sección tiene referencias, pero necesita más para complementar su verificabilidad.
Este aviso fue puesto el 16 de noviembre de 2018.
La lección difícil, cuadro de William-Adolphe Bouguereau.
El aprendizaje es el proceso a través del cual se modifican y adquieren habilidades, destrezas, conocimientos, conductas y valores.1 Esto como resultado del estudio, la experiencia, la instrucción, el razonamiento y la observación. Este proceso puede ser analizado desde distintas perspectivas, por lo que existen distintas teorías del aprendizaje. Es una de las funciones mentales más importantes en humanos, animales y sistemas artificiales. En él intervienen diversos factores que van desde el medio en el cual se desenvuelve el ser humano, así como los valores y principios que se aprenden en la familia. En esta última se establecen los principios del aprendizaje de todo individuo y se afianza el conocimiento recibido, el cual forma la base para aprendizajes posteriores.
El aprendizaje humano está relacionado con la educación y el desarrollo personal. Debe estar orientado adecuadamente y es óptimo cuando el individuo está motivado. El estudio sobre cómo aprender interesa a las Ciencias de la Educación, la pedagogía, la neuropsicología, la psicología educacional y la antropología, aquella que recoge las peculiaridades propias de cada etapa del desarrollo humano. Concibe sus planteamientos teóricos, metodológicos y didácticos para cada una de ellas. Dentro de ella se enmarcan, por ejemplo la pedagogía y la andragogía, la educación de niños y adultos respectivamente.2
Explanation: corona plis
Westfield is a fictional town where the students investigated the formation of the rust. The rust formation occurred because of the chemicals and the water.
What is rust?Rust is a reddish-brown iron oxide that is formed by the reaction between iron and water. It contains hydrous iron (III) oxides and iron (III) oxide-hydroxide.
The water in the Westfield consisted of chloride ions and some other salt present in the fertilizers and chemicals that increased the rusting process.
The rust formed because of the chemical reaction that occurs between iron pipes and fertilizers sprayed in the fields.
Therefore, rust forms through a reaction between iron and water.
Learn more about rust here:
https://brainly.com/question/27073737
Which feature of a balanced chemical equation demonstrates the law of
conservation of mass?
A. It has the same types of atoms on both sides of the reaction
arrow.
B. It shows the reactants of a chemical reaction to the left of the
reaction arrow.
C. It shows the products of a chemical reaction to the right of the
reaction arrow
D. It has coefficients to show how much of each substance a
chemical reaction uses.
SUBMIT
Answers
Answer:
Another answer is : It has equal numbers of each type of atom in its reactants and products.
Explanation:
I just got it right on A.pex
Given the data from the question, the correct statement is:
It has the same types of atoms on both sides of the reaction arrow (Option A) What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
From the law of conservation of matter, it is evident that the same atoms of the element in the reactants are present in the products.
Thus, we can conclude that the correct answer to the question is: It has the same types of atoms on both sides of the reaction arrow (Option A)
Learn more about chemical equation:
https://brainly.com/question/7181548
How many Joules of heat are released from a 400g piece of glass that has been cooled
from 28°C to 6°C? The specific heat for this particular type of glass is 0.664 J/g°C.
please show work.
Answers
Answer:
400 × 22 × 0.664 = 5843.2 J
In the alkaline phosphatase assay, you will you be monitoring the formation of product by measuring the absorbance of the solution using a spectrophotometer. Why are you monitoring the formation of product at a pH of 9 and a wavelength of 400nm.
A. At pH 9, the product, p-nitrophenol, will be ionized, the solution will appear yellow in color, and thus can be monitored at the wavelength of maximum absorption for the phenolate ion which is 400nm.
B. At pH 9, the product, p-nitrophenol, will be ionized and colorless
C. At pH 9, the product, p-nitrophenol, will be un-ionized and yellow in color
Answers
Answer:
a. At pH 9, the product, p-nitrophenol, will be ionized, the solution will appear yellow in color, and thus can be monitored at the wavelength of maximum absorption for the phenolate ion which is 400nm
Explanation:
In alkaline phosphatase assay, the hydrolysis of p nitrophenyl phosphate to p nitrophenol happens. When the ph is 9, the product which is p nitrophenol would undergo ionization. The solution is going to appear to be of yellow and it can be monitored at a wavelength for maximum absorption of phenolate ions at 400nm.
Option A is the answer to the question.
How many equivalents are in a solution that contains 0.25 moles Mg2+ and 0.50 moles Cl–?
Answers
Answer:
Explanation:
Mg²⁺ is divalent , hence
Molecular weight / 2 = equivalent weight .
.25 moles = 2 x .25 equivalents = .5 equivalents .
Cl⁻ is monovalent so
molecular weight = equivalent weight
.50 mole = .50 equivalent
Total equivalent = .50 of Mg²⁺ + .50 of Cl⁻
= 1 equivalent .
What is the hybridization of the central atom in NOCl
Answers
Answer:
NOCl structure has geometry of trigonal planar and N has sp2 hybridisation. N is the central atom because it is less electronegative than O atom and Cl cannot be the central atom because it only forms a single bond. So, the central atom of NOCl is N and its hybridisation
Complete the balanced molecular chemical equation for the reaction below. If no reaction occurs, write NR after the reaction arrow. Pb ( N O ₃ ) ₂ (aq) + K I (aq) → ☐⁴⁻ ☐³⁻ ☐²⁻ ☐⁻ ☐⁺ ☐²⁺ ☐³⁺ ☐⁴⁺ 1 2 3 4 5 6 7 8 9 0 ☐₁ ☐₂ ☐₃ ☐₄ ☐₅ ☐₆ ☐₇ ☐₈ ☐₉ ☐₀ + ( ) → ⇌ (s) (l) (g) (aq) NR Pb I N O K Reset
Answers
Answer: [tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The double displacement reaction in which one of the product is formed as a solid is called as precipitation reaction.
The balanced molecular equation is:
[tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow PbI_2(s)+2KNO_3(aq)[/tex]
who know the song genius?
Answers
Answer:
Me
Explanation:
The one with sia??
Question 125 pts An FCC nickel-carbon alloy initially containing 0.20 wt% carbon is carburized at an elevated temperature and in an atmosphere in which the surface carbon concentration is maintained at 1.0 wt%. Given: Do = 2.3 x 10-5 m2/s, Qd = 111,000 J/mol. If, after 49.5 h, the concentration of carbon is 0.35 wt% at a position 4.0 mm below the surface, determine the temperature at which the treatment was carried out. Boltzmann constant, k = 8.617x10-5 eV/(atom-K)= 1.38x10-23 J/(atom-K) and Avogadro’s number, NA=6.022×1023 atom/mol. Group of answer choices 1300 K 1375 K 975 K 1027 K
Answers
Answer:
975 K
Explanation:
Here, given :
The alloy is a FCC nickel-carbon.
[tex]$D_o= 2.3 \times 10^{-5} \ m^2/s$[/tex]
[tex]$Q_d=111,000 \ J/mol$[/tex]
Boltzmann Constant, [tex]$k=8.617 \times 10^{-5} \ eV/(atom-K)$[/tex]
Therefore,
[tex]$\frac{C_x-C_o}{C_s-C_o}= \frac{035-0.20}{1.0-0.20}$[/tex]
= 0.1875
[tex]$=1-\text{erf}\left(\frac{x}{2\sqrt{Dt}}\right)$[/tex]
So, [tex]$\text{erf}\left(\frac{x}{2\sqrt{Dt}}\right) = 0.8125$[/tex]
Therefore,
w erf w
0.92 0.80677
y 0.8125
0.96 0.82542
Now,
[tex]$\frac{y-0.92}{0.96-0.92} = \frac{0.8125-0.80677}{0.82542-0.80677}$[/tex]
y = 0.93228
[tex]$\text{erf}\left(\frac{x}{2\sqrt{Dt}}\right) = 0.93228$[/tex]
[tex]$D=\frac{x^2}{4t(0.93228)^2}$[/tex]
[tex]$D=\frac{(4\times 10^{-3})^2}{4\times 49.5 \times 3600 \times (0.93228)^2}$[/tex]
[tex]$= 2.58 \times 10^{-11}$[/tex]
[tex]$T=\frac{Q_d}{R(\ln D_o - \ln D)}$[/tex]
[tex]$T=\frac{111000}{8.31(\ln (2.3 \times 10^{-5}) - \ln (2.58 \times 10^{-11}))}$[/tex]
T = 974.84 K
T = 975 K
Someone pls help me!!
Answers
Answer:
0.0821 L•atm/mol•K
Explanation:
The value of the ideal gas can be obtained as follow:
NOTE: We shall use the standard value for each variable. Based on the options given above, we shall use the equivalent units as well.
Pressure (P) = 1 atm
Volume (V) = 22.4 L
Number of mole = 1 mole
Temperature (T) = 273 K
Gas constant (R) =?
PV = nRT
Divide both side by nT
R = PV / nT
R = (1 × 22.4) / (1 × 273)
R = 22.4 / 273
R = 0.0821 L•atm/mol•K
Thus, the ideal gas constant is 0.0821 L•atm/mol•K
Use your balanced reaction to make a "for every" statement for magnesium and hydrochloric acid in this reaction
A: For every 1 mol of magnesium, the reaction makes 1 moles of hydrochloric acid.
B: For every 24.305 mol of magnesium, the reaction uses up 34.46 mol of hydrochloric acid,
C: For every 1 mole of magnesium, the reaction uses 2 moles of hydrochloric acid.
D: For every 1 mol of magnesium, the reaction uses 1 mol of hydrochloric acid.
Answers
Answer:
Right answer is C.
Explanation:
Based on the reaction with magensium, Mg, and hydrochloric acid, HCl:
Mg + 2HCl → MgCl₂ + H₂
The reaction is balanced in moles therms
We can see that 1 mole of Magnesium is reacting with 2 moles of HCl to produce 1 mole of MgCl₂ and 1 mole of H₂. In another words:
For every 1 mole of magnesium, the reaction uses 2 moles of hydrochloric acid.
Right answer is C.The balanced reaction will be C. For every 1 mole of magnesium, the reaction uses 2 moles of hydrochloric acid.
From the information given, based on the reaction with magnesium and hydrochloric acid, the balanced reaction will be:
Mg + 2HCl → MgCl₂ + H₂
It can be deduced that the reaction is balanced. It can be seen that 1 mole of magnesium is reacting with 2 moles of hydrochloric acid to produce 1 mole of MgCl₂ and 1 mole of H₂.
Read related link on:
https://brainly.com/question/16943395
If a 130-kg car is traveling at a velocity of 23 m/s, what is the kinetic energy of the car?
Answers
KE = 1/2 * 130 * 23^2
KE = 34385J
Kinetic energy is the amount of energy present in the object due to motion. It is required by the body for action and motion. The kinetic energy of the car is 34385J.
What is kinetic energy?Kinetic energy is a type of energy that is directly proportional to the mass of the object and the square of the velocity. The formula for the kinetic energy can be given as,
[tex]\rm KE = \dfrac{1}{2}mv^{2}[/tex]
Here,
Mass of the car (m) = 130 kg
Velocity of the car (v) = 23 m/s
Substituting values in the equation:
[tex]\begin{aligned}\rm KE &= \dfrac{1}{2}\rm mv^{2}\\\\&= \dfrac{1}{2}\times 130\times (23)^{2}\\\\&= 34385\;\rm J\end{aligned}[/tex]
Therefore, 34385J is the kinetic energy of the car.
Learn more about kinetic energy here:
https://brainly.com/question/13870124
Which formula represents an ionic compound?
A)H2
B)CH4
C)CH3OH
D)NH4CI
Answers
Explanation:
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose C6H12O6 and oxygen O2 gas. Calculate the moles of water needed to produce 0.075mol of glucose. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits
Answers
Answer: 0.45 moles of water are needed to produce 0.075mol of glucose.
Explanation:
The balanced chemical reaction is:
[tex]6CO_2(g)+6H_2O(l)\rightarrow C_6H_{12}O_6(aq)+6O_2(g)[/tex]
According to stoichiometry :
1 mole of glucose require = 6 moles of [tex]H_2O[/tex]
Thus 0.075 moles of glucose require = [tex]\frac{6}{1}\times 0.075=0.45[/tex] moles of [tex]H_2O[/tex]
0.45 moles of water are needed to produce 0.075mol of glucose.
Which of the following is a potential exception to cell theory? Choose 1 answer: Fungal spore Asexual reproduction Mitochondria Amoebas
Answers
Answer:
Asexual reproduction
Explanation:
Cells are able to re produce themselves without other cells needed. If cells need others to make more then how would that work and plus we wouldn't have the theory of cells existing.
8. Which of the following is TRUE about limiting and excess reactants?
A. The excess reactant will be completely consumed after the reaction is complete
B. The limiting reactant determines the maximum amount of product that can be formed
C. Some of the limiting reactant is left over after the reaction is complete.
D. The reactant that has the largest given mass will be the excess reactant.
Answers
The statement which is TRUE about limiting and excess reactants is (B) The limiting reactant determines the maximum amount of product that can be formed.hence the correct option is (B)
What is Limiting reagent ?A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent.
Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.
The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end.
The precise quantity of reactant required to react with another element can be estimated from the reaction stoichiometry.
Therefore, The statement which is TRUE about limiting and excess reactants is (B) The limiting reactant determines the maximum amount of product that can be formed.hence the correct option is (B)
learn more about Limiting reagent here ;
https://brainly.com/question/11848702
#SPJ6
1.8 in to mm
Express your answer using two significant figures.
Answers
Answer:
46 mm.
Explanation:
Hello there!
In this case, according to the equivalence statements to convert from inches to centimeters, centimeters to meters and meters to millimeters, we can write:
2.54 cm = 1 in
100 cm = 1 m
1000 mm = 1 m
It is possible to set up the following conversion factor to obtain the required millimeters:
[tex]1.8in*\frac{2.54cm}{1in}*\frac{1m}{100cm} *\frac{1000mm}{1m} \\\\=46mm[/tex]
Best regards!
All animals make body heat. True or false?
Answers
Answer:
False
Explanation:
Some animals are cold blooded
Answer:
false
Explanation:
Answer fast please?????????????
Answers
Answer:
option a. iron,copper, aluminium.
What is the estimated life expectancy of tin reserves?
Answers
Answer:
chemical reaction hope this helps ;)
Explanation:
Give two reasons why people should use petrochemicals wisely.
Answers
2 Because they're a cause of carbon pollution.
As petrochemicals are originate from petroleum products, it is non-renewable and also can result in pollution so they are used wisely.
What are petrochemicals?Petrochemicals are the chemical byproducts of petroleum refining. Some petroleum-derived chemical compounds are also derived from other fossil fuels, such as coal or natural gas, or renewable sources, such as maize, palm fruit, or sugar cane.
All of this begins with six fundamental petrochemicals: ethylene, propylene, butylenes, benzene, toluene, and xylenes, which are combined with other chemicals and transformed into other materials that improve products.
Concerns are raised not only about the negative environmental impact, but also about the impact on human health.
Many petrochemicals are among the most toxic substances known to man, but they are found in almost everything, from plastics to synthetic fragrances and dyes to fertilizer.
Thus, these are used wisely.
For more details regarding petrochemicals, visit:
https://brainly.com/question/28540307
#SPJ2
What are a few ways your body maintains homeostasis?(6th grade and its science)
Answers
Answer: Internal Temperatures. Similarly, the cardiovascular, integumentary (skin and associated structures), respiratory, and muscular systems work together to help the body maintain a stable internal temperature. If body temperature rises, blood vessels in the skin dilate, allowing more blood to flow near the skin's surface.
Explanation: