The element which is likely to have a high thermal conductivity among given options is sodium.
What is thermal conductivity?Thermal conductivity of any substance is define as the capability of the substance to carry heat or transfer of heat.
As we know that metals are the good conductors of heat and non-metals are bad conductors, so we exclude carbon, antimony and chlorine atom from this group as they are non-metals. And sodium atom has the thermal capability.
Hence option (4) is correct.
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Answer: Option (4) is correct
Explanation:
"Review of the Basics" - WS #1
Directions: Please answer each fill in the blank with the best answer. »
1.
are atoms or groups of atoms that have a positive or negative charge.
2. A
is any atom or group of atoms with a positive charge
Answer: 1. Ions
2. Cation
Explanation:
No explanation; this is basic vocabulary. :)
Lithium nitride has a high melting point, 813*C. Nitrogen trifluoride has a low malting point, -207*C.
Explain why the melting points are different? [2 marks]
.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
Answer:
Lithium has high melting and boiling point due to its small size, due to which it possesses high ionisation energy. As a result the binding energy in its crystal lattice is very high. This is why lithium has high melting and boiling point.
Explanation:
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1.
What is the concentration of a saline solution
with 234.0 grams of NaCl per 250.0 mL of solution?
Answer:
16.015668 M
Explanation:
Concentration is mols/L
nacl molar mass is 58.44277 g/mol
moles = mass/molar mass
moles = 4.00391699
4mol/0.250L = 16.015668 M solution
0.05 moles of HCL are added to 2 L of H2O. What is the molarity of the solution?
Impossible to answer the question with the information provided.
1.60
0.025M
10.4
The molarity of a solution that has 0.05 moles of HCL are added to 2 L of H2O is 0.025M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
M = n/V
Where;
M = molarityn = number of molesV = volumeM = 0.05/2
Molarity = 0.025M
Therefore, the molarity of a solution that has 0.05 moles of HCL are added to 2 L of H2O is 0.025M.
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Elements has physical and chemical properties most similar to silicon?
Germanium (Ge) has properties that are similar to silicon.
Calculate the cell potential for the galvanic cell in which the reaction
Al(s)+Au3+(aq)↽−−⇀ Al3+(aq)+Au(s)
Al
(
s
)
+
Au
3
+
(
aq
)
↽
−
−
⇀
Al
3
+
(
aq
)
+
Au
(
s
)
occurs at 25 ∘C
25
∘
C
, given that [Al3+]=0. 00170 M
[
Al
3
+
]
=
0. 00170
M
and [Au3+]=0. 795 M
[
Au
3
+
]
=
0. 795
M
Explanation:
those to arrows between states which makes the chemical unstable right now so you need to change both those signs good luck!
Which of the following phrases best defines the word software?
A.
an object that orbits the Earth
B.
a set of radio waves that are used to determine distance
C.
an image that is taken from the air
D.
a program on a compute
Answer:
D. a program on a computer
Explanation:
At 101.3kPa and 298 K. What is the total amount of heat released Open one mole of aluminum oxide is formed from its elements
Answer:
The answer is (3) 1676 kJ. The heats of reaction at 101.3 kPa and 298 K for reaction: 4Al(s) +3O2(g)= 2Al2O3(s) is -3351 kJ. So for one mole of aluminum oxide is 3351/2=1676 kJ.
Why do sea turtles rely on instincts more than mammals do?
Answer:
Mammals do not have instincts, so they must learn all their behaviors from their parents in order to survive.
Sea turtles must survive on their own, while mammals spend time with their parents and learn how to survive as they grow.
Sea turtles are less intelligent than mammals and, thus, cannot learn new behaviors from their parents.
Explanation:
Sea turtles rely on instincts more than mammals do, beacuse to get food for their survival.
What are instincts?Insticts are the natural impulse or motivation which are present from the inborn time to perform some functions in order to react in some specific external stimuli.
Mammals do not react impulsively in any external conditions because they have members or friends from their famliy side, who will teach them how to behave or react. But turtles didn't have that special person, so they do work rely on instincts to get food or many other purposes.
Hence, to survive sea turtles rely on instincts more than mammals do.
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i don’t really know how to do this and need help
Answer:
3,550,000
Explanation:
3 significant figures is a number which has 3 figures
and zeros ( zero is not a figure )
Answer:
3550,000
Explanation:
Rounding rule:
If > 5 enter one
If < 5 rounding
Note:
< = less than
> = greater than.
Solve:
Base on the given:
it < 5 rounding
Thus,
3545,530 ≈ 3550,000
~Lenvy~
Which mineral reacts readily with cool, dilute hydrochloric acid to produce visible bubbles of carbon dioxide gas?.
Answer:
The acid reacts with the mineral to release CO2 gas that is bound into the crystal as carbonate ion.
Explanation: i got it corrcet
Given the reaction: 2Na + 2H2O --> 2NaOH + H2 How many moles of Na are needed to produce exactly 5.6 liters of H2, measured at STP?
For a reaction 2Na + 2H2O --> 2NaOH + H2, The moles of Na needed to produce exactly 5.6 liters of H2 is mathematically given as
moles of H2=0.125mole
How many moles of Na are needed to produce exactly 5.6 liters of H2,?
Generally, the equation for the Chemical Reaction is mathematically given as
2Na + 2H2O -> 2NaOH + H2(g)
Therefore, since 2Na gives 1H2
PV=nRT
Hence
n=PV/RT
n=1*5.6/0.0821 *273
n=0.249mols
In conclusion,The moles is
2Na=1H2
moles of H2=0.125mole
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Which statement best describes a society’s desire for fuel-efficient vehicles? Choose the correct answer.
Auto manufacturers set fuel-efficiency standards.
Interest in fuel efficiency decreases when fuel prices are low.
Fuel shortages in the 1980s started the interest in fuel efficiency.
An increase in fuel efficiency increases carbon dioxide emissions.
Fuel shortages in the 1980s started the interest in fuel efficiency best describes a society’s desire for fuel-efficient vehicles because of Iran- Iraq war.
Why Fuel shortages in the 1980s started?The Iran-Iraq War in 1980 is the main cause of shortage of oil production. Iraq's and Iran's oil production dropped significantly which triggering economic recessions worldwide.
So that's why society’s desire for fuel-efficient vehicles in order to reduce consumption as well as reduce pollution.
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What is the greatest degree of ionic character found in a sulfur bond
Answer:
Chlorine
Explanation:
What is the minimum quantity of energy that must be possessed by the reactants for a reaction to occur?
Group of answer choices
Collision model
Thermal energy
Catalyst
Activation energy
Answer:
Activation energy :)
Explanation:
The activation energy starts the reaction! Without it, we would not find out the solution!
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how many moles are needed to make 2.5 L of a 3.8 M solution?
Answer:
9.5
Explanation:
that the answer I hope am correct
How many electrons does calcian have to gain or lose to have 8 valence electrons
Answer:
two electrons
Explanation:
Calcium atoms will lose two electrons in order to achieve the noble gas configuration of argon.
A person observes that when the front porch of a house is wet , it is very slippery. The person adds sand to a paint can and repaints the porch’s surface.
How will the new paint make the porch safer?
Answer:
a
Explanation:
it will help stop frictoin
Animals burrow into soil is this mechanical weathering or chemical weathering
Answer:
Animals also contribute to mechanical weathering. Digging animals such as moles break apart rocks underground, while the movement of animals on surface rock can scratch the rock's surface or exert pressure that causes the rock to crack.
Explanation:
pls brainlist me, correct me if I'm wrong
What is the second quantum number of a 3p3 electron in phosphorus 1s22s22p63s23p3
The second quantum number of a 3p₃ electron in phosphorus 1s2, 2s2, 2p6, 3s2, 3p3 is 3.
What are quantum numbers?Quantum numbers are a set of numbers that describe the position and energy of an electron in an atom.
Principal, azimuthal, magnetic, and spin quantum numbers are the four types of quantum numbers.
Thus, the second quantum number of a 3p₃ electron in phosphorus 1s2, 2s2, 2p6, 3s2, 3p3 is 3.
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How do the names of molecular compounds differ from the names of ionic compounds.
Long Answer:
Ionic: Cation is named first followed by the anion.
If it's an ionic compound with a transition metal, there are more than one possible ion. Molecular - named with the least electronegative ion first + prefixes are given to both ions to indicate number of atoms in each element.
Short Answer: Ionic compounds- Cation is named first, followed by the anion.
Freon-12 synthesized by the reaction between fluoride at carbon tetrachloride and antimony(III)Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride: How many moles each compound (CCL; SbF;, CClFz, and SbCI3) are there if the reaction is |00% complete
Suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.
What is the significance of the balanced reaction?A balanced reaction is one where the reactants and products are present in equal amounts, and if the 100% reaction takes place, then the reactant sides have 1 mol of SbF₃ and 3 mol of CCl₄ that make the product of 1 mol of SbCl₃ and 3 mol of CClF₂. After the 100% reaction, all the reactants get converted into the product. The complete reaction is the below.
SbF₃ + 3CCl₄ → SbCl₃ + 3CClF₂
Hence, suppose 5.0 mol of antimony (III) fluoride is added to 10.0 mol of carbon tetrachloride, and from the 100% reaction there are the equivalents of 0 moles of SbF₃, 5.0 moles of SbCl₃, 0 moles of CCl₄, and 15.0 moles of CClF₂.
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A chemist uses 0.25 l of 2.00 m h2so4 to completely neutralize a 2.00 l of solution of naoh. the balanced chemical equation of the reaction is given below. 2naoh h2so4 right arrow. na2so4 2h2o what is the concentration of naoh that is used?
The concentration of NaOH that is used to completely neutralize is 0.25 Liters.
How do we calculate concentration?We will calculate the concentration in terms of molarity by using the below formula:
M₁V₁ = M₂V₂, where
M₁ = molarity of H₂SO₄ = 2m
V₁ = volume of H₂SO₄ = 0.25 L
M₂ = molarity of NaOH = ?
V₂ = volume of NaOH = 2 L
On putting all these values on the above equation, we get
M₂ = (2)(0.25) / (2) = 0.25 L
Hence required volume is 0.25 L.
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Acidic oxides are common air pollutants and the source of acid precipitation. Basic oxides are not. Use what you know about these oxides to explain this difference.
Answer:
An acidic oxide reacts with water and produces acid. They are also called acid anhydride, which are oxides that react with water to form an acid, or with a base to form a salt. They are oxides of either nonmetal or of metals in high oxidation states. An oxide is a binary compound that we obtain upon the reaction of oxygen with other elements. Their chemistry can be systematically understood by taking an oxoacid and removing water from it until only an oxide remains. The resulting oxide belongs to this group of substances. Usually, it is the oxide of non-metals. For example, sulfurous acid (SO2), sulfuric acid (SO3), and carbonic acid (CO2) are acidic oxides. Thus, CO2 dissolves in water to give carbonic acid, and NO2 gives a mixture of nitrous and nitric acids. An inorganic anhydride (a somewhat archaic term) is an acid anhydride without an organic moiety.
Explanation:
H2(g) + Cl2(g) ⟶ 2HCl(g)
If 3.7 liters of Cl2 are used for this reaction, how much HCl will be formed? Assume there are enough reactants to complete the reaction and assume the reaction occurs at STP.
The volume of hydrochloric acid, HCl produced from the reaction when 3.7 L of Cl₂ are used is 7.4 L
Balanced equationH₂ + Cl₂ —> 2HCl
Since the reaction occurs at standard temperature and pressure (STP), we can say that:
From the balanced equation above,
1 L of Cl₂ reacted to produce 2 L of HCl
How to determine the volume of HCl producedFrom the balanced equation above,
1 L of Cl₂ reacted to produce 2 L of HCl
Therefore,
3.7 L of Cl₂ will react to produce = 3.7 × 2 = 7.4 L of HCl
Thus, the volume of HCl produced from the reaction is 7.4 L
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Using p and q as variables, write formulas for calculating the probability of an offspring from a population having each of the following genotypes
The genotypes are not found in the question, but p and q can be used to calculate genotypic frequencies by using the equation p2 + 2pq + q2 = 1.
What is the Hardy–Weinberg principle?The Hardy–Weinberg principle is a model used in population genetics to estimate allele and genotypic frequencies in a population.
According to the Hardy–Weinberg principle, the sum of p + q is equal to 1, where p and q represent the dominant and recessive alleles, respectively.
The Hardy–Weinberg principle considers the absence of different evolutionary forces acting on the population.
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The formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.
What is the genotypic frequency?The number of people with a particular genotype divided by the total number of people in a population is known as genotype frequency.
p2 + 2pq + q2 = 1 is the Hardy Weinberg equation.
Thus, the formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.
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can you give me a real life example of a single replacement?
Answer:A single-replacement reaction is a chemical reaction in which one element replaces another in a compound. F₂ + 2NaCl → 2NaF + Cl₂, where F replaces Cl in NaCl. A double-replacement reaction is a reaction in which the metals in two ionic compounds exchange partners.
This part insulates the reaction chamber from the transfer of heat to or from the surrounding environment. this part contains a known amount of water, which is placed there before the experiment starts. this part is where the metal is placed at the beginning of the experiment. this part is used for measuring the initial and final temperatures of the water.
The amount of heat transferred in and out of the system is measured by calorimetry. The thermometer in the calorimeter is used to measure the temperature.
What are the parts of the calorimetry device?The thermometer (A) is a device used to measure the final and the initial temperature of the water or any other liquid in a system. A metal vessel is a place where the reaction mixture is present.
In-vessel (B), water, and metal are placed before the beginning of the experiment. The styrofoam cup or the outer metal vessel (C) insulates the instrument, from regulating the heat transformation.
Therefore, part A measures the temperature of the reaction mixture.
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When calcium carbonate reacts with hydrochloric acid, calcium ions are transferred to the solution. Write only one net ionic equation for this reaction:
Answer:
In conclusion, the net ionic equation for the reaction between calcium carbonate and hydrochloric acid is CaCO3 solid plus two H+ aqueous react to form Ca2+ aqueous plus CO2 gas plus H2O liquid.
When calcium carbonate reacts with hydrochloric acid, calcium ions are transferred to the solution, the the net ionic equation is CaCO₃(s) + 2H⁺ → Ca²⁺ + CO₂ + OH⁻ + H⁺.
What is net ionic equation?
Net ionic equation of any reaction is the equation where all entities are written in the form of ions except spectator ions.
Given chemical reaction is:
CaCO₃(s) + 2HCl(aq) → CaCl₂(aq) + CO₂(g) + H₂O(l)
Ionic reaction for the above reaction will be written as:
CaCO₃(s) + 2H⁺ + 2Cl⁻ → Ca²⁺ + 2Cl⁻ + CO₂ + H⁺ + OH⁻
In the baove reaction Cl⁻ is the spectator ion as they are present on both sides of the given chemical reaction. So the net ionic reaction will be written as:
CaCO₃(s) + 2H⁺ → Ca²⁺ + CO₂ + OH⁻ + H⁺
Hence the net ionic reaction is CaCO₃(s) + 2H⁺ → Ca²⁺ + CO₂ + OH⁻ + H⁺.
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Briefly explain the two ways Avogadro's number was calculated.
The value of Avogadro's number was obtained by dividing the charge of a mole of electrons by the charge of a single electron which is equal to 6.02214154 x 1023 particles per mole.
The most common used way is
n=Charge of one mole of atom /charge of one single atomThere can be another derived way
No of molecules=No of moles ×Avagadro noAvagadro no=No of molecules/No of moles