Answers
Answer:
A. manganese change from +7 to +2
Explanation:
Reduction means a gain of electrons, which means the oxidation number will go down or the charge goes down basically or become more negative charge. On the left, Mn has +7 in MnO4-. On the right, it has 2+, so it has been reduced.
Related Questions
Calculate the density of a material that has a mass of 56.6 g and a volume of 17.2 cm
Answers
Answer:
d = 3.29 g/cm³
Explanation:
Given data:
Density of material = ?
Mass of material = 56.6 g
Volume of material = 17.2 cm³
Solution:
Formula;
d = m/v
d = density
m = mass
v = volume
by putting values,
d = 56.6 g/ 17.2 cm³
d = 3.29 g/cm³
HELP ASAP PLEASE!!!!!!
Answers
Answer: yellow ? i’m sorry if i’m not right
Explanation:
1 One mole of a substance contains the same number of atoms or molecules as
one mole of any other substance.
a Which contains more atoms: 56 g of Fe or 16 g of S? Show your working.
Answers
Answer:
a) Fe contains more atoms.
Explanation:
To find the number of moles we divide by the molar mass:-
56g of iron (Fe) = 56/55.845 = 1.0028 moles
16g of Sulphur (S) = 16/32.06 = 0.6938 moles.
So 56g of Fe contains more atoms.
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 56 g of Fe contains the same number of atoms.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
moles of iron = 56/55.845 = 1.0028 moles
moles of sulfur = 16/32.06 = 0.6938 moles.
number of atoms=number of moles×6.022×10²³(Avogadro number)
number of atoms of iron = 1.0028×6.022×10²³
=6.038×10²³atoms
number of atoms of sulfur=0.6938×6.022×10²³
=4.178×10²³atoms
Therefore, 56 g of Fe contains the same number of atoms.
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Which coefficients will balance this equation? *
Ag +
C2 >
AC2
Answers
Answer:
16Ag + 2C2 ---> 4 Ag4C
Explanation:
Ag + C2 ----> AgC2
The valence of Ag is one
Valence of Carbon is four
A balanced equation would be
16Ag + 2C2 ---> 4 Ag4C
The Charles Zeppelin, a fictional airship, is filled with 2.16 x 105 liters of hydrogen gas (H2). On the ground, the airship’s temperature is 295 K. Once the airship has lifted off the ground, the temperature of the gas rises to 425 K. What is the volume of the Charles Zeppelin once it is airborne?
Answers
Answer:
V2 = 3.11 x 105 liters
Explanation:
Initial Volume, V1 = 2.16 x 105 liters
Initial Temperature, T1 = 295 K
Final Temperature, T2 = 425 K
Final Volume, V2 = ?
These quantities are related by charle's law and the equation of the law is given as;
V1 / T1 = V2 / T2
V2 = T2 * V1 / T1
V2 = 425 * 2.16 x 105 / 295
V2 = 3.11 x 105 liters
Which of the following statements is NOT true about combustion reactions?
Select one:
a. The products are always carbon dioxide and methane.
b. The reactions involve burning of hydrocarbons.
c. Combustion reactions have oxygen and a hydrocarbon as reactants.
d. There are two types of combustion reactions: complete and incomplete.
Answers
Answer:
The answer is option C..
Statement that doesn't portray a combustion reactions in this question is
C: Combustion reactions have oxygen and a hydrocarbon as reactants.
Combustion can e regarded as a high-temperature exothermic redox chemical reaction which usually takes place in the presence of fuel and an oxidant,.This oxidant is usually oxygen and after oxidation, gaseous products is formed in mixture termed as smoke which are carbon dioxide and methane.Example of this are;
production of energy in thermal power plants.Burning of Wood or Coal Combustion of Natural GasTherefore, option C is correct.
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Can someone please answer this question please I really need to know
Answers
Answer: aging?
Explanation: sorry, i’m not too sure, but that would be my best guess.
I need help ASAP pls
Answers
Which two statements must be true to define a species?
O A. Organisms must be able to produce offspring that can also
reproduce.
O B. Organisms must be found in the same place on Earth.
O C. Organisms must be a common ancestor to another organism.
OD. Organisms must have very similar DNA.
SUBMIT
Answers
Answer:
The 2 statements would be A and C.
Answer:A, organisms must be able to produce offspring that can also reproduce and D, organisms must have very similar DNA
Explanation: took the quiz and got it right a p e x
Predict the product of Ca + H2O (Single Replacement). If y'all can add an explanation as well, that would be much appreciated!!
Answers
Answer:
Ca + H2O------->CaO+H2
since ca combine with oxygen.
Two students worked together to create a Bohr model of a sodium atom. When creating this model they realized the valence shell only has one electron and does not meet the Octet rule. They began to argue about how this atom will become an ion.
A Student A is correct. Losing an electron would cause the number of protons and electrons to be imbalanced, and the atom would then have an overall negative charge.
B Student B is correct. Losing an electron would cause the number of protons and electrons to be imbalanced, and the atom would then have an overall positive charge.
C Student A is correct. Losing an electron would cause the number of neutrons and electrons to be imbalanced, and the atom would then have an overall negative charge.
D Student B is correct. Losing an electron would cause the number of neutrons and electrons to be imbalanced, and the atom would then have an overall positive charge.
i need
Answers
Answer:
A
Explanation:
Because the Bohr model explains the Conteplation of the Atom which consedes to the answer explaing the neutrons and electrons have a relation which makes A right.
The study of chemicals and the arrangement of electrons in the shell is called chemistry.
The correct answer is option A that is Losing an electron would cause the number of protons and electrons to be imbalanced, and the atom would then have an overall negative charge.
what is the octet rule?The octet rule is a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gasAccording to the question, it is Because the Bohr model explains the Contemplation of the Atom which concedes to the answer explaining the neutrons and electrons have a relation which makes A right.
Hence, the correct option A.
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Which feature is forming?
mountain
rift valley
earthquake
island chain
Answers
island chain
ÚwÙ
how are the atomic mass number of an element and the stability of the nucleus of the atom related?
Answers
Answer:
An atomic Nucleus consists of protons and Neutrons, collectively called nucleons.These stable nuclides Occupy a narrow band of stability on a graph of number of protons versus number of neutrons. The binding energy per nucleon is largest for the elements with mass numbers near 56; These are the most stable nuclei.
Which substances are acids? Check all that apply.
AgOH
HF
NiOOH
NH4OH
HMnO4
Zn(OH)2
Answers
Answer:
Explanation:
Hope this helps:
AgOH is silver hydroxide
HF is hydrofluoric acid
NiOOH is nickel oxide hydroxide
NH4OH is ammonium hydroxide
HMnO4 is Permanganic acid
Zn(OH)2 is zinc hydroxide
Answer:
HF
HMnO4
Explanation:
bc i know everything
pls tell me answer
Answers
Answer:
no
Explanation:
Which compound contains the greatest percent oxygen by mass?
a. Na2C204
b. H2SO4
c. HIO4
d. KMnO4
Answers
Answer:c
Explanation:because the percent of oxygen by mass is not a funcion
Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. 60° A B 45° W C\1050 The measurement of angle B is The measurement of angle A is The measurement of angle C is entum. All rights reserved.
Answers
Answer:
blobby`
Explanation:
abc
A corn plant has been genetically engineered. It produces pollen that can make its own toxins. These toxins protect the corn plant against pests. What is a likely impact on the environment around the corn plant?
The carbon dioxide level would increase in the area.
Newer strains of pesticide-resistant pests may develop.
Bird and butterfly populations around the area may increase.
The concentration of pesticides in a nearby lake would increase.
Answers
Answer:
Newer strains of pesticide-resistant pests may develop.
Explanation:
Answer:
C. Newer strains of pesticide-resistant pests may develop
Explanation:
16. On some occassions, more than half of the moon is illuminated.
a. True
O b. False
Answers
Answer:
true is the correct ans of this question
4. What holds a moon in its orbit? *
Answers
manganese (IV) nitride formula
Answers
Answer:
Mg(NO3)2 is the formula of manganese (IV) nitride.
The formula for Manganese (IV) nitride is Mn3N4.
What is the formula for Manganese (IV) nitride?Manganese (IV) nitride is represented by the chemical formula Mn3N4. It consists of three manganese atoms (Mn) and four nitrogen atoms (N). The Roman numeral IV indicates that manganese has a +4 oxidation state in this compound.
Its powder can be used in the preparation of other nitride compounds with high hardness, high thermal conductivity, corrosion resistance, wear resistance and high temperature resistance properties.
Read more about manganese
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how many moles of iron are in 250 g
Answers
4.5 mol Fe
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
250 g Fe
Step 2: Identify Conversions
Molar Mass of Fe - 55.85 g/mol
Step 3: Convert
[tex]\displaystyle 250 \ g \ Fe(\frac{1 \ mol \ Fe}{55.85 \ g \ Fe} ) = 4.47628 \ mol \ Fe[/tex]
Step 4: Check
Follow sig fig rules and round; given 2 sig figs.
4.47628 mol Fe ≈ 4.5 mol Fe
How many atoms are in 5.9g of lithium carbonate, Li2(CO3)?
Answers
The number of atoms = 4.8 x 10²² atoms
Further explanationGiven
5.9 g of Lithium carbonate
Required
The number of atoms
Solution
mol Lithium carbonate(MW=73.9 g/mol) :
= mass : MW
= 5.9 g : 73.9 g/mol
= 0.08
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
So for 0.08 mol :
= 0.08 x 6.02.10²³
= 4.8 x 10²² atoms
If 3.75 moles of aluminum react, how many moles of sulfur are needed?
16 Al + 3S8 --> 8Al2S3
0.70 mol
0.050 mol
20 mol
16 mol
Answers
Answer:(A) 0.70 mol
Explanation:
The moles of sulfur needed would be 0.7.
From the equation of the reaction, the mole ratio of Al to S8 is 16:3, meaning that for every 16 moles of Al, 3 moles of S8 would be required.
Thus, if 3.75 moles of Al react, the mole of S8 that would be required can be calculated as:
16 moles of Al = 3 moles of S8 3.75 moles of Al = ?= 3 x 3.75/16
= 0.7 moles
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When naming a compound, which of these is written first?
Answers
Answer:
cation
Explanation:
Metal
Nonmetal
Anion
Cation
When naming a chemical compound, the cation is written first before anything else.
A typical ionic compound consists of two components - the cation and the anion. While the cation is positively charged in ion, the anion is negatively charged. The cation of a typical ionic compound is named first before the anion and the name often carries that of the element that composes it.
The name of the element that makes up the anion is modified by removing the last few characters ending the name and replacing it with the suffix 'ide'. For example, NaCl is named sodium chloride.
At the time of naming a compound, the one that would be written first would be:
- Cation
The compounds are described as substances that consist of varying combinations of elements from the chemical union. The compounds are given the name by starting with the cation(+ve charged ion) that it possesses followed by the anions(-ve charged ions) it contains.For example, KCl(potassium chloride) involves K+ cations and Cl- anions. Thus, 'cation' would be the correct answer among the given options as they come later in the process.Learn more about 'Compound' here:
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Describe the major advantages and disadvantages of asexual and sexual reproduction.
Answers
Answer:
Allows for a quick "doubling of population because they skip pollination and fertilisation. There is less energy required for asexual reproduction. Large colonies can form that out complete the other organisms for nutrients and water. ... Sexual reproduction leads to genetic variation in new generations of offspring.
Explanation:
Asexual reproduction is usually faster and uses less energy than sexual reproduction. But asexual reproduction produces no differences in DNA among offspring, and creates competition for resources. Sexual reproduction produces differences in the DNA of offspring, and competition for resources is not as high. But sexual reproduction can require a lot more time and energy.
What are the coefficients that will balance the equation below?
NaOH + AICI:
NaCl + Al(OH)3
1, 1, 1,3
1, 3, 1,3
3, 1, 3, 1
1, 3, 3, 1
Answers
Answer:
3, 1, 3, 1 is a required answer.
How did Thomson show that cathode
rays are different from light?
Answers
Answer:
They had a negative charge
Explanation:
how might some organelles in a cell
be compared to an Assembly line.
Answers
The systematic name for
CH3CH2C=CH2
CH?
a) 3-methylbutane
b) O2-methylbutane
c) 02-metrybut-1-ene
d) 3-methylbutiene
Answers
Answer: I’m sorry if I’m wrong but I think the answer would be a) 3-menthylbutane. Again, if I’m wrong I am very sorry. Hope this helps❤️
