Answer:
Cl
Explanation:
The element Cl will have the strongest ionization energy from the given choices. Most non-metals have higher ionization energy compared to metals.
Ionization energy is the energy required to remove the most loosely held electron from the gaseous phase of an atom.
As you go from left to right on the periodic table, it increases progressiveFrom top to bottom, the ionization energy reduces significantly. The attractive force between the protons in the nucleus and the electrons plays a very important role. In metals, they have very large atomic radius, the attractive force on the outer electrons is very weak. This is not the case in non-metalsHow many moles of water are present in 55.1 g of H2O
Answer:
3.0585147719047385 is the answer
Suppose you wish to use this reaction to determine the weight percentage of TiO2 in a sample of ore. To do this you collect the O2 gas from the reaction. If you find that 1.586 grams of the TiO2 containing ore evolved 32.1 mg of oxygen gas, what is the weight percent of TiO2 and Ti in the ore
Answer:
Mass percentage of TiO2 in the ore = 5.04%
Mass percentage of Ti = 3.01%
Explanation:
Equation of reaction is given below:
3 TiO2(s) + 4 BrF3(l) ---> 3 TiF4(s) + 2 Br2(l) + 3 O2(g)
From the equation of reaction above, 3 moles of O2(g) is obtained from 3 moles of TiO2(s)
Molar mass of O2 = 32 g/mol; molar mass of TiO2 = 79.87 g/mol, molar mass of Ti = 47.87 g/mol
Number of moles of O2 in 32.1 mg or 0.0321 g of O2 = 0.0321 g/32 g/mol = 0.001 moles
Therefore, 0.001 moles of O2 will be obtained from 0.001 moles of TiO2
Hence, mass l of 0.001 moles of TiO2 = 0.001 moles x 79.87g/mol = 0.07987
Mass percentage of TiO2 in the ore = 0.07987 x 100/1.586 = 5.04%
Mass of Ti in sample = (0.07987 - 0.03210) g = 0.04777 g
Mass percentage of Ti = 0.04777 × 100/1.586 = 3.01%
Classify this reaction.
C3H6(g) + O2(g) → CO2(g) + H2O(g)
a
Single Replacement
b
Synthesis
c
Double Replacement
d
Combustion
Answer:
d
Combustion
Explanation:
if you start with 362 grams of C3 H8 how many grams of H2O will be produced
Answer:
52 g H2O (to 2 significant figures)
Explanation:
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Calculate the amount of heat in kilojoules required to vaporize 2.58 kg of water at its boiling point.
Answer:
The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.
Explanation:
A substance undergoes a change in temperature when it absorbs or gives up heat to the environment around it. However, when a substance changes phase it absorbs or gives up heat without causing a change in temperature. The heat Q that is necessary for a mass m of a certain substance to change phase is equal to:
Q = m*L
where L is called the latent heat of the substance.
In this case:
m=2.58 kgThe heat of vaporization of water is L=2260*10³ J/kgReplacing:
Q= 2.58 kg* 2260*10³ J/kg
Q= 5,830,800 J = 5,830.8 kJ (Being 1,000 J= 1 kJ)
The amount of heat required to vaporize 2.58 kg of water at its boiling point is 5,830.8 kJ.
The required amount of heat will be "5830 KJ".
Given:
Amount of water,
m = 2.58 kgAs we know,
Latent heat of vaporization,
[tex]L_{vap} = 2260\times 31 \ kg[/tex]Now,
The amount of heat required will be:
= [tex]m\times L_{vap}[/tex]
= [tex]2.58\times 2260[/tex]
= [tex]5830 \ KJ[/tex]
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24. H2SO4 has
a) ionic bond
b) both Ionic and covalent bonds
c) ionic, covalent and coordinate bonds
d) covalent bond
Answer:
C.
Explanation:
para sakin letter C ganonn
For test 6 (150 hevy 50 light particles), what is the pressure contribution from the heavy particles?
Answer:
The pressure contribution from the heavy particles is 17.5 atm
Explanation:
According to Dalton's law of partial pressures, if there is a mixture of gases which do not react chemically together, then the total pressure exerted by the mixture is the sum of the partial pressures of the individual gases that make up the mixture.
In the simulation:
the pressure of the 50 light particles alone was determined to be 5.9 atm, the pressure of the 150 heavy particles alone was measured to be 17.5 atm,
the total pressure of the mixture of 150 heavy and 50 light particles was measured to be 23.4 atm
Total pressure = partial pressure of Heavy particles + partial pressure of light particles
23.4 atm = partial pressure of Heavy particles + 5.9 atm
Partial pressure of Heavy particles = (23.4 - 5.9) atm
Partial pressure of Heavy particles = 17.5 atm
Therefore, the pressure contribution from the heavy particles is 17.5 atm
Select the atom/ion in each pair which has a larger radius F or F-1
Answer:
F-
Explanation:
The atomic radius of F is 72 pm and that of F- is 136 pm.
Whats a homogeneous mixture? A mixture that contains particles_____________
A. that are unevenly mixed together
B. that are evenly mixed together
C. that eventually separate
D. suspended in gelatin
Answer:
A homogeneous mixture is a mixture in which the components that make up the mixture are uniformly distributed throughout the mixture.
Explanation:
A change in pH usually produces a change in enzyme activity because:_______.Select one:a. pH of the environment changes the conformation of the enzyme.b. enzyme activity increases at extreme pH values (either acidic or basic).c. enzyme activity is usually least active below its optimum pH.d. enzyme activity is most active above its optimum temperature.
Answer:
c. enzyme activity is usually least active below its optimum pH
Explanation:
Enzyme activity depends highly on pH. Enzymes are biological molecules which are proteins and influence the rates of important biochemical reactions in the human body.
Enzymes has a value of pH at which it works most perfectly. This pH value is known as its optimum pH. Above or below this value, the enzyme does not function optimally.
Hence, a change in pH usually produces a change in enzyme activity because enzyme activity is usually least active below its optimum pH
If the decomposition of a sample of KClO3 produces 3.29 g of O2. What was the mass (g) of the original sample?
Answer: 8.41 g
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} O_2=\frac{3.29g}{32g/mol}=0.103moles[/tex]
The balanced chemical equation for decomposition is :
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
According to stoichiometry :
As 3 moles of [tex]O_2[/tex] are produced by = 2 moles of [tex]KClO_3[/tex]
Thus 0.103 moles of [tex]O_2[/tex] are produced by =[tex]\frac{2}{3}\times 0.103=0.0687moles[/tex] of [tex]KClO_3[/tex]
Mass of [tex]KClO_3=moles\times {\text {Molar mass}}=0.0687moles\times 122.5g/mol=8.41g[/tex]
8.41 g was the mass of the original sample.
In the NCl3 molecules there are banded pairs of electrons and nonbonded pairs of electrons attached to central atom?
Answer: the anwser is a. cuz i did it so im smart and u should listen to me
Explanation:non>
Three type of symbiosis
Answer:
mutualism, commensalism, and parasitism.
Question:
Three type of symbiosis
Answer:
Mutualism: both partners benefit. ...
Commensalism: only one species benefits while the other is neither helped nor harmed. ...
Parasitism: One organism (the parasite) gains, while the other (the host) suffers
Little Info.
Symbiosis is a close relationship between two species in which at least one species benefits. For the other species, the relationship may be positive, negative, or neutral. There are three basic types of symbiosis: mutualism, commensalism, and parasitism
Which of the following BEST describes a way in which water moves in the water cycle?
A. Water falls from the sky as rain. It stays where it falls until it evaporates
B. Water falls from the sky as snow. As the snow melts, the water runs up to Earth's mountains.
C. Water falls from the sky as rain. The water then flows downhill
D. Water falls from the sky as hail. The hail is eventually buried in the ground
Answer:
C. Water falls from the sky as rain. The water then flows downhill.
Explanation:
Water cycle can be defined as a process which typically involves the circulation (movement) of water between the Earth's atmosphere, land and ocean under various atmospheric conditions such as precipitation (rain and snow), transpiration, condensation and evaporation.
Basically, the movement of the water starts from the sky due to the condensation of water vapor to form clouds and later result to rainfall. Consequently, the rain water are either soaked by the soil or are made to flow down the hill.
The statement which best describes a way in which water moves in the water cycle is that, water falls from the sky as rain. The water then flows downhill or seeps into the ground.
in this trial, 0.400 M NaOH was added to 40.00 ml of 0.400 M HCl. How many ml of base must be added to cause the colour to change?
Answer:
The amount of Ml that is needed
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Answer:
Explanation:
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When a galvanic cell is comprised of an anode and a cathode of precisely the same material, this is called a(n):
Answer:
Concentration cell
Explanation:
Galvanic cells and even electrolytic cells usually consist of two electrodes namely anode and cathode. These 2 electrodes can either be made of the same metals or different metals, and also an electrolyte whereby the two electrodes are immersed.
Now, in the case where the electrodes are made of the same metal, we call it a concentration cell because A concentration cell is a cell that consists of two half-cells that have the same electrodes, but yet differ in concentrations.
Which of the following energy resources provides non-recyclable energy and is also the least polluting?
a) Biomass energy
b) Nuclear power
c) Hydropower
d) Natural gas
Answer:
b) Nuclear power
Explanation:
The nuclear power plant generated the nuclear energy that utilize the radio active materials like uranium i.e. finite. Thus, this is a non-recyclable.
Also this energy does not release any type of polluting gas neither it is harmful like carbon dioxide or any green house gases So it would be least polluting
Therefore as per the given statement, the option b is the correct one
Answer:
b) Nuclear power
Explanation:
took the test :)
Which of the following metal ions can potentially form both low-spin and high-spin complexes?
a. Ti2+
b. Cu+
c. Fe2+
d. Ni2+
e. Cr3+
Answer:
c. Fe2+
Explanation:
Coordination compounds comprise solely complex ions together with one or more counter ions. They are compounds in which metal atoms or ions are directly bonded to anions or neutral atoms in conjunction with coordinate covalent bonds.
From the given options, only Fe2+ can form both low-spin and high-spin.
To determine that, we find out the number of unpaired spins in Fe2+
At the ground state:
The electronic configuration is:
Fe: [Ar] 3d⁶ 4s²
After the removal of two electrons, the configuration becomes
Fe²⁺ : [Ar] 3d⁶
A metal ion has the ability to form both low-spin and high-spin complexes if the metal-ion comprises more than 3 and less than 8 d -electrons.
So, since Fe²⁺ contains more than 3 and less than 8. Then Fe²⁺ is the right option.
Ti²⁺ contains only two d electrons
Cu⁺ contains more than eight d electrons
Ni²⁺ contains eight d electrons
Cr³⁺ contains three d electrons
What is the molarity of a 3.0 solution of magnesium chloride prepared with 9.0 molecules of MgCl2 A. 6.0 M B. 3.0 M C. 27.0 M D. 0.33 M PLEASE HELP IM GOING TO CRY SO MUCH IF I FAIL
Answer:
Option B. 3.0 M
Explanation:
From the question given above, the following data were obtained:
Volume of solution = 3.0 L
Mole of MgCl₂ = 9 moles
Molarity =?
Molarity can simply be defined as the mole of solute per unit litre of the solution. Mathematically, it can be expressed as:
Molarity = mole of solute /Volume of solution
With the above formula, we can obtain the molarity of the solution as follow:
Volume of solution = 3.0 L
Mole of MgCl₂ = 9 moles
Molarity =?
Molarity = mole of solute /Volume of solution
Molarity = 9 / 3
Molarity = 3 mol/L = 3.0 M
Thus, the molarity of the solution is 3 M
How many moles of magneslum chloride are there in 148 grams of magnesium chloride?
Answer:
1.554442238816872 moles
Explanation:
Answer:
1.5544422388169434
Explanation:
1 mole is equal to 1 moles Magnesium Chloride, or 95.211 grams.
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A compound has a molecular weight of 146 g/mol. A 0.3250 g sample of the compound contains 0.1605 g of carbon, 0.0220 g of hydrogen, and 0.1425 g of sulfur. What is the molecular formula of the compound
Answer: The molecular formula is [tex]C_6H_{10}S_2[/tex]
Explanation:
We are given:
Mass of [tex]C[/tex] = 0.1605 g
Mass of [tex]H[/tex]= 0.0220 g
mass of [tex]S[/tex] = 0.1425 g
Step 1 : convert given masses into moles.
Moles of C =[tex]\frac{\text{ given mass of C}}{\text{ molar mass of C}}= \frac{0.1605g}{12g/mole}=0.0134moles[/tex]
Moles of H =[tex]\frac{\text{ given mass of H}}{\text{ molar mass of H}}= \frac{0.0220g}{1g/mole}=0.0220moles[/tex]
Moles of S =[tex]\frac{\text{ given mass of S}}{\text{ molar mass of S}}= \frac{0.1425g}{32g/mole}=0.0044moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For C = [tex]\frac{0.0134}{0.0044}=3[/tex]
For H = [tex]\frac{0.0220}{0.0044}=5[/tex]
For S =[tex]\frac{0.0044}{0.0044}=1[/tex]
The ratio of C : H: S= 3: 5: 1
Hence the empirical formula is [tex]C_3H_5S[/tex]
The empirical weight of [tex]C_3H_5S[/tex] = 3(12)+5(1)+1(32)= 73g.
The molecular weight = 146 g/mole
Now we have to calculate the molecular formula.
[tex]n=\frac{\text{Molecular weight }}{\text{Equivalent weight}}=\frac{146}{73}=2[/tex]
The molecular formula will be=[tex]2\times C_3H_5S=C_6H_{10}S_2[/tex]
Which set of atoms have 3 valence electrons?
carbon, silicon, and germanium
O beryllium, magnesium, and calcium
O hydrogen, lithium, and sodium
O boron, aluminum, and gallium
Answer:
boron, aluminum, and gallium
Explanation:
They are in group 3A on the periodic table which means they have 3 valence electrons
100 pts, 4 questions I am having issues answering
17 Explain oxidation using rust as an example
19 What is a solution that cannot dissolve any more solute because it is too concentrated?
26 What two factors contribute to expansion?
32 How are the groups organized in the periodic table? What do all the elements in a group have in common?
Answer:
17. The iron metal is oxidized to form the iron oxide known as rust.
19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.
26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west
32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.
Explanation:
17. The iron metal is oxidized to form the iron oxide known as rust.
19.A saturated solution will not dissolve any more solute and any extra solute added will simply stay as it is, without dissolving. An unsaturated solution has less solute than its solubility and hence can still add more solute, till it reaches the saturation level.
26 An Overflowing Population. The swelling American population played a large part in the decision Americans made to head, The Government Opens Up New Land. The American government itself encouraged its citizens to move west
32. The periodic table was first assembled in 1869 by a Russian chemist named Dmitri Mendeleev. He came up with a way of organizing the elements that were known at the time, arranged them in order of atomic weight, and then grouped them into rows and columns based on their chemical and physical properties. Here is a unique "Mayan" format Periodic Table. Elements in the same group are those that are in a single vertical line from top to bottom. They have the most in common between the two directions. They share the same number of electrons in their valence subshells.
strengths as bases:
H2O, F-, Cl-, NO,, and CN-
Answer:
Cl^-<NO3^-<H2O<F^-<CN^-
Explanation:
When we talk about base strength we are referring to how easily a chemical specie accepts protons.
The greater the ability of a specie to accept H^+, the greater its base strength.
The order of increasing base strengths of the species listed are shown in the answer above.
What was a result of the Zhou capital being destroyed by invaders?
A) Leaders of the feudal states declared independence.
B) Loyal relatives supported the king to protect the empire.
C) Feudal rulers began to use nomadic soldiers in their armies.
D) Philosophers gained power by encouraging citizens to rebel.
Answer:
A
Explanation:
Answer:
think it is D
Explanation:
hope this helps
Is the following chemical reaction balanced? 2H2O2 H2O + O2 yes no
Measurements also show that a certain sample of the unknown compound contains 6.2 mol of oxygen and 4.1 mol of nitrogen.
Write the complete chemical formula for the unknown compound.
The chemical formula for the unknown compound : N₂O₃
Further explanationGiven
6.2 mol of oxygen and 4.1 mol of nitrogen.
Required
The chemical formula
Solution
Chemical formulas can be expressed in terms of empirical or molecular formulas.
The empirical formula shows the simplest mole ratio of a compound
Meanwhile, the molecular formula shows the actual ratio of the number of elements that make up the compound
We divide the two known moles by the smallest mole (moles of nitrogen)
[tex]\tt N\div O=\dfrac{4.1}{4.1}\div \dfrac{6.2}{4.1}=1\div 1.5=2\div 3[/tex]
The heat of fusion of a compound is 126 Joules
per gram. What is the total number of Joules of
heat that must be absorbed by a 15.0-gram
sample to change the compound from solid to
liquid at its melting point?
Answer:
1.89 × 10³ J
Explanation:
Step 1: Given data
Heat of fusion (ΔH°fus): 126 J/gMass of the sample (m): 15.0 gStep 2: Calculate the heat (Q) required to melt the sample
The fusion is the phase change from solid to liquid. We can calculate the heat required for the fusion of the sample using the following expression.
Q = ΔH°fus × m
Q = 126 J/g × 15.0 g
Q = 1.89 × 10³ J
How many hydrogen atoms are present in .46 moles of NH3
Answer:
2.78 x 10²³
Explanation:
1 mole contains 6.02 x 10²³ hydrogen atoms => 0.46 mole contains 0.46(6.02 x 10²³) hydrogen atoms or 2.78 x 10²³ atoms.
Caution => When to use H vs H₂ => This problem is specific for 'hydrogen atoms' but some may simply say hydrogen. In such cases use H₂ or 'molecular hydrogen' is the focus. it's a matter of semantics, H vs H₂.