Answer:
(A)
Explanation:
All the Fe ions in the other choices have +2 valences. Since the N ion has a -3 valence, the compound FeN can only be formed if Fe has a +3 valence.
What can be found in the box on a periodic table?
In the box on a periodic table we can find its atomic number, symbol, average atomic mass, and (sometimes) name of the element.
By the 20th century, it was clear that atomic numbers, not atomic masses, were involved in the periodic relationship. The periodic law, a more recent formulation of this relationship, states that an element's properties are a periodic function of its atomic number.
The elements are arranged in a modern periodic table in increasing order of their atomic numbers, and atoms with comparable properties are grouped in the same vertical column (Figure below). With its atomic number, symbol, average atomic mass, and (sometimes) name, each box represents an element. The elements are grouped in 18 vertical columns called groups and seven horizontal rows known as periods or series.
Each column's header lists the names of its groups. Roman numerals and capital letters have traditionally been used on labels in the United States. The IUPAC advises using the digits 1 through 18, and these labels are more widely used. Parts of two of the rows, totaling 14 columns, are typically written below the table's main body in order for it to fit on a single page.
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True or false? 1.0 grams of oxygen (O) has the same number of atoms as 1.0 gram of silver (Ag).
Answer:
true hope it helps
Explanation:
have a nice day
DOES ANYONE KNOW ANY OF THE ANSWERS TO THIS ??
Answer:
Which one do you need the answer to?
Explanation:
18) Write the expression: the sum of the quantity h and 2 divided by 4. A) h 4 2 B) h 2 4 C) h 2 4 D) 4 h 2
The expression is [tex]\frac{(h+2)}{4}[/tex] which can be solved by BODMAS rule
The abbreviation BODMAS, which stands for "Brackets, Order of powers or roots, Division, and Multiplication," is followed by the BODMAS rule. A stands for addition and S for subtraction. According to the BODMAS rule, multi-step mathematical statements must be solved in the BODMAS order from left to right. Similar to how Addition and Subtraction depend on which comes first in the sentence, Division and Multiplication are thought of as interchangeable operations.
The expression can be written as follows WE have 2 quantities h and 2
Their sum can be written as h+2 Now We have the sum divided by 4 so it can be written as : [tex]\frac{(h+2)}{4}[/tex]
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ph before and after sulphuric acid is added
Answer:
added to what? base? if its added to base then it will increase in pH. H2S04(sulphuric acid is strong) so the pH is ard 3
A bike travels at a constant speed of 4.0 m/s for 5 s, how far does it go?
Answer:
20 meters
Explanation:
The bike is moving at a rate of 4 meters per second. In 5 seconds, the bike would have gone 20 meters
4 m/s x 5s = 20 m
Answer:
20 miles
Explanation:
Why do you think when we see a recessive trait, phenotype, like a straight hair line, that we can figure out the genotype? Why can we not for sure determine the genotype of a dominant trait?
Answer & Explanation:
It is NOT POSSIBLE to determine a person's genotype if that person presents the dominant trait
What volume of oxygen is needed to completely react with 171.9 g of S8 at STP?
S8(s) +1202(g) →8S03(1)
All chan
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, the volume of oxygen needed to completely react with 171.9 g of S8 at STP is 180.09L.
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.
S[tex]_8[/tex](s) +12O[tex]_2[/tex](g) →8SO[tex]_3[/tex](l)
171.9 g of S8
mole of S[tex]_8[/tex]= 171.9 g/ 256.52g/mol
=0.67mol
The mole of oxygen = 12×0.67
= 8.04mol
volume of oxygen= 22.4× 8.04
=180.09L
Therefore, the volume of oxygen needed to completely react with 171.9 g of S8 at STP is 180.09L.
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(100 POINTS + BRAINLIEST) i don't know which subject this belongs to but this is an earth science class!!!
Tell the story of the life cycle of a star the size of our sun, Be sure to include all stages from "pre-birth" to death.
Describe the differences between our sun's life cycle to a star who is at least 5 times bigger than our sun.
The life cycle of a star the size of our sun starts with a nebula, a huge cloud of dust and gas. The gravity of the nebula compresses the cloud until the atoms fuse together, creating a star. This stage is known as pre-birth.
Next, the star enters a main sequence phase, where it shines brightly for millions of years, powered by nuclear fusion.
Eventually the star will slowly run out of hydrogen and the fusion process will become less and less efficient. The star will expand and become what is known as a red giant. This marks the end of the main sequence phase.
After this point, the star expels its outer layers, leaving behind a small, hot core called a white dwarf. It will continue to cool down until it becomes a black dwarf.
If the star is at least 5 times bigger than our sun, it will enter a different life cycle. After the red giant phase, the star will undergo a supernova explosion, which will spew dust and gas into the surrounding areas. These remainders will later form new stars, planets, and other cosmic bodies. What's left of the star will become a neutron star or a black hole.
When atoms of aluminum-27 are bombarded with alpha particles, a neutron and an element are produced. The particular isotope formed is
An alpha particle bombardment of aluminum with an atomic number of 27 results in the production of a neutron and phosphorus 15. The particular isotope formed is aluminum-28.
Fundamental alterations take place at the level of the atomic nucleus during nuclear reactions. Analyze the properties of the neutron, which has a mass similar to that of a proton but no electric charge. As a result, when it interacts with the aluminum core, the atomic number should remain constant but the atomic mass should rise by one unit. The newly produced atom is in an excited state when it transitions to the base state with the emission of a high-energy radiation called a gamma ray. Aluminum-28 isotope is formed. ⁷A₂₇ + ⁰n₁ → ⁷Al₂₈ˣ
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Define molarity of a solution.
Answer:
Molarity of a solution is defined as
the amount of a substance in a certain volume of solution or the moles of a solute per liters of a solution and also known as the molar concentration of a solution.
The units of molarity are M or mol/L
Define molarity of a solution.
Answer:Molar concentration or Molarity is a measure of the concentration of a chemical species, in particular of a solute in a solution, in terms of amount of substance per unit volume of solution.
_____
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The compound NaCl consists of 60.7% chlorine. How many grams of chlorine can be obtained from 49.6 grams of NaCl?
Answer:92.1g
Explanation:
This means that the reaction consumed4.004moles NaCl⋅2 moles Na2moles NaCl=4.004 moles NaConvert this to grams by using the element's molar mass4.004moles Na⋅22.99 g1mole Na=92.1 g
Please help have to do today
ASAP HELP PLZZZZ
Complete the sentence to show how the student makes sure that all the
acid reacts.
Choose the answer from the box.
[1 mark]
1) in excess
2) in solution
3) molten
4) soluble
The student adds copper oxide to the acid until the
copper oxide is ______
Answer:
1) in excess
Explanation:
Copper oxide is insoluble in water, while acid is soluble in water
Can someone please help me
Question 1 For parts of the free-response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. You must show your work to receive credit for your answer. Examples and equations may be included in your answers where appropriate. HCl(aq) + NaOH(aq) + NaCl(aq) + H20(1)
A student was given the task of titrating a 20.mL sample of 0.10MHCl(aq) with 0.10MNaOH(aq). The HCl(aq) was placed in an Erlenmeyer flask. An equation for the reaction that occurs during the titration is given above. (a) According to the equation for the reaction, if the amount of the reactants is halved, how does this affect the amount of H20(I) produced in the reaction?
Titration is a quantitative analysis method for determining the concentration of a substance from a measured titrant. According to the equation, if the reactants are halved, the amount of H2O produced will be halved.
The molecular equations for sodium hydroxide, hydrochloric acid, sodium chloride, and water can be expressed as:
HCl + NaOH ⇒ NaCl + [tex]H_{2}[/tex]O
In the given equations, the spectator ions and the ionic equation can be distinguished as follows:
H⁺ + Cl⁻ Na⁺ + OH⁻ ⇒ Na⁺ + Cl⁻ + 2H⁺ + O⁻²
The net ionic equation is:
H⁺ + OH⁻ ⇒ [tex]H_{2}[/tex]O
From the above equation, we can see that the production of water molecules depends on the number of reactants. The reactants are,
H⁺ and OH⁻.
Therefore, when the number of reactants is halved, the resulting water molecules are halved.
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Tooth enamel, or hydroxyapatite, is an essential part of the tooth structure. Its composition is 39. 8% calcium,
18. 5% phosphorous, 41. 43% oxygen, and 2% hydrogen. What is the empirical formula? It has a molar mass of
1004 g/mol. What is the molecular formula of this compound?
The empirical formula of this compound is Ca3(PO4)2.
What is an Empirical formula?
An empirical formula is a type of chemical formula that shows the simplest ratio of atoms in a molecule, rather than the total number of atoms. It is the simplest possible chemical formula that shows the relative numbers of each type of atom in a molecule.
The molecular formula is Ca3(PO4)2•H2O, which indicates that the compound is composed of three calcium atoms, two phosphate atoms, and two water molecules. The molar mass of this compound is 1004 g/mol, which is two times the molar mass of the empirical formula (502 g/mol). Therefore, the molecular formula of this compound is Ca3(PO4)2•H2O.
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What is the freezing point of the solution after you add an additional 1. 34 g (Use i = 2. 5 for MgCl2)
The freezing point of the solution after you add an additional 1.34 g is -0.808°C.
What is freezing point of a solution?A solution's freezing point is lower than the pure solvent's freezing point. This means that for freezing to happen, a solution needs to be cooled to a lower temperature than the pure solvent.
We use the equation: to determine the mass of the solution
Density = mass/volume
1.05 g/ml = mass/ 50ml
mass = 1.05×50
mass = 52.5g.
Percentage of magnesium chloride in the solution is 1.52%
Mass of magnesium chloride in the solution = 1.52 % of 52.5 g
Mass of magnesium chloride in the solution = 1.52/100×52.5
Mass of magnesium chloride in the solution = 0.798g
The following equation is used to determine depression in freezing point:
ΔTf = Freezing point of pure solution - Freezing point of solution
ΔTf = i Kf m
Freezing point of pure solution - Freezing point of solution = i Kf m
m = m solute × 100/M solute × W solvent
Given values,
Freezing point of pure solution (water) is 0°C
i is Vant hoff factor = 2.5
Kf molal freezing point elevation constant = 1.86°C/m
m solute given mass of solute (magnesium chloride) = [0.798 + 1.34] g
m solute = 2.138 g
M solute molar mass of solute (magnesium chloride) = 95.2 g/mol
W solvent mass of solvent (water) = [52.5 - 0.798] g = 51.702 g
substitute the given values,
0 - Freezing point of solution = 1×1.86×2.138×1000/95.2×51.702
Freezing point of solution = -0.808°C.
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Complete question is " A 50 mL solution is initially 1.52% MgCl₂ by mass and has a density of 1.05 g/ml
What is the freezing point of the solution after you add an additional 1.34 g MgCl₂? (Use i = 2.5 for MgCl₂)."
consider the following organic compounds ;propene butane ethanol and ethyne. which of these is an isomer of methyl propane.
A team of scientists claim that they have discovered a new experimental
method for determining atomic mass. Which of the following is necessary for
the claim to be considered valid?
A. The atomic mass of an element according to the new method
must be greater than its previous measurement.
B. The method must work for all isotopes.
C. The atomic mass of an element according to the new method
must be less than its previous measurement.
OD. Another team of scientists must be able to replicate the results of
the experiment.
SUBMIT
For a team of scientists to claim that they have discovered a new experimental method for determining atomic mass, their claim is to be considered valid only if another team of scientists is able to replicate the results of the experiment.
In order for a scientific claim to be considered valid, it is important that the results of the experiment can be replicated by other researchers.
Replication means that other scientists should be able to obtain the same results using the same methods. This helps to ensure that the results are accurate and reliable, rather than being a fluke or an error.
Without the ability to replicate the results, it is difficult to have confidence in the validity of the claim, as it may be due to uncontrolled variables or other factors that cannot be reproduced. Ensuring that results are replicable is an important part of the scientific process and helps to build a strong foundation of knowledge.
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There are 4 wavelengths that are emitted from a Hydrogen atom that can be seen by the human eye. Two of the wavelengths are the same color. What colors are they
Answer:
a) red, blue, and violet
b) orange, yellow, and green
C) red, orange, and yellow
D) blue, indigo, and violet
Which of the following techniques can be used to separate a heterogeneous mixture into its component parts? (3 points)
Sort by color
Separation by density
Apply heat
Apply pressure
Answer:
Separation by density
Hope this helps
What is the outcome when the arrangement of atoms changes in a substance?
When the arrangement of atoms changes in a substance, the properties of the substance can change as well. The different arrangements of atoms can lead to different chemical and physical properties.
For example, if the atoms of a substance are rearranged to form a new compound, the new compound will have different chemical properties than the original substance. A new compound may have a different color, odor, reactivity, or melting point than the original substance.
Changing the arrangement of atoms without changing the chemical composition can change the physical properties. For example, a crystalline solid has atoms or molecules arranged in a regular, repeating pattern. This arrangement gives the material unique properties such as density, melting point, and hardness. If the arrangement of atoms and molecules changes, the properties of solids can also change.
In summary, when the arrangement of atoms in a substance changes, the properties of the substance can also change. Different arrangements of atoms have different chemical and physical properties.
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Compare and contrast the carbon cycle of 1500 and of 2021
Answer:
Carbon moves from the atmosphere to the land, ocean, and life through biological, chemical, geological and physical processes in a cycle called the carbon cycle. Because some carbon gases are greenhouse gases, changes in the carbon cycle that put more carbon in the atmosphere also warm Earth’s climate.
In the lab, the dominant phenotype for sheep color is wool and the recessive phenotype for sheep color is wool
The dominant phenotype for sheep color is wool because it is the most common color seen in sheep.
What do you mean by Phenotype?
Phenotype is the physical, biochemical, and physiological characteristics of an organism, as determined by both genetic makeup and environmental influences. It is the physical expression of an organism's genes, and can be seen in its morphology, development, and behavior.
Wool is usually white or off-white in color and is the result of a dominant gene. The recessive phenotype for sheep color is non-wool, which is usually a darker color, such as black, brown, or gray. This is the result of a recessive gene and is less common than the dominant gene.
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The reaction of hydrogen (H2) and fluorine (F2) produces hydrofluoric acid (HF). How many grams of HF are produced if 3. 00 g of hydrogen react with excess fluorine with a 25 percent yield?
1.50g of hydrofluoric acid is produced if 3.00 g of hydrogen reacts with excess fluorine with a 25 percent yield.
The balanced equation for the reaction of hydrogen (H2) and fluorine (F2) to form hydrofluoric acid (HF) is:
H2 + F2 -> 2HF
To calculate the amount of HF produced, we'll use the concept of theoretical yield and percent yield.
The theoretical yield is the maximum amount of product that can be formed based on the amount of reactants used.
Here, we're given that 3.00 g of hydrogen is used, so to find the theoretical yield of HF, we'll use the molar ratio of hydrogen to hydrofluoric acid in the balanced equation.
1 mol of H2 produces 2 mol of HF
So, 3.00 g of H2 produces 2*3.00g = 6.00g of HF
Percent yield is the ratio of the actual yield to the theoretical yield multiplied by 100%.
It's given that the yield is 25%.
So the actual yield of hydrofluoric acid will be:
Actual yield = (Theoretical yield) x (percent yield/100)
Actual yield = 6.00g x (25/100)
Actual yield = 1.50g
So, 1.50g of hydrofluoric acid is produced if 3.00 g of hydrogen reacts with excess fluorine with a 25 percent yield.
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For each of the following chemical equations, write all possible mole ratios. a. 2HgO(s) → 2Hg(l ) + O2(g) b. 4NH3(g) + 6NO(g) → 5N2(g) + 6H2O(l ) c. 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
What is c. 2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)
a) The mole ratio is 2/1
b) The mole ratio is 4/6
c) The mole ratio is 2/3
What is the mole ratio?We have to note that the mole ratio is the ratio of the stoichiometric coefficient that we have between two reactants that can be found in an equation. In the case of the reaction equations that we have, we must look closely at each equation.
As we can see, each of the reaction equations is balanced and we can now be able to obtain the mole ratio of each of the reaction as shown in the answer above.
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A 211-mL sample of a 0.285 M CaCl2 solution is left on a hot plate overnight; the following morning, the solution is 1.25 M. What volume of water evaporated from the 0.285 M CaCl2 solution
When a 211-mL sample of a 0.285 M CaCl₂ solution is left on a hot plate overnight and the following morning, the solution is 1.25 M, the volume of water evaporated from the 0.285 M CaCl₂ solution is 48.108 ml.
Molarity (M) is defined as the ratio of the number of moles of solute present in a solution to the volume of the solution in litres.
given here,
Molarity of the original solution(M₁) = 0.285M
Volume of the original solution(V₁) = 211 ml
Molarity of the solution in the morning (M₂) = 1.25 M
Volume of the solution in the morning (V₂) = ?
We will calculate the volume of the solution in the morning by using the formula:
M₁ × V₁ = M₂ × V₂
⇒0.285 M× 211 ml = 1.25 M × V₂
⇒V₂ = 0.285 M× 211 ml / 1.25 M
⇒V₂= 48.108ml
The volume of water evaporated from the 0.285M CaCl₂ solution is 48.108 ml.
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I need help ASAP!!!! Which of the following is an advantage of using nuclear power plants to
produce electricity?
A) Radioactive waste from nuclear reactors is now being used to power cars,
B) There are no hazardous byproducts from nuclear reactions,
C) Nuclear power does not produce greenhouse gasees
Answer:
The answer is C.
Explanation:
Answer:
C is right i yeah C is right
What are some examples of evidence that support Darwin's theories of evolution and natural selection?
Some examples of evidence that support Darwin's theories of evolution and natural selection , such as fossils and similarities between related living organisms.
Darwin employed certain sorts of evidence to support his hypothesis of natural selection, and these types of evidence are still used today. Examples include fossils and similarities between related living animals. Others, like DNA analysis, were unavailable to Darwin's generation but are now employed by scientists to further our understanding of evolution. evidence supporting evolution: fossil strata, remains of extinct organisms, similarities between current-day organisms, DNA similarities, and embryonic similarity. Artificial selection, or breeding, is a crucial sort of evidence that Darwin looked at and is being looked at and employed today.
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