Answer:
B.) lone pairs of electronsExplanation:
The table below indicates the “Molecular Geometry” of the central atom depending on whether the groups of electrons around it are covalent bonds to other atoms or simply lone pairs of electrons.
A radioactive isotope has an activity of 9.60 mCi. After 3.75 hours the activity is 7.39 mCi. What is the half-life of the isotope
For a radioactive isotope has an activity of 9.60 mCi. , the half-life of the isotope is mathematically given as
t0.5 = 23893 s
What is the half-life of the isotope?Generally, the equation for the half-life is mathematically given as
t0.5=T*0.693
Where
A = A0 e^(-t/T)
t/T = lnA0/A
3.75 hours/T=ln 9.60/7.39
T = 34478.5 s
Therefore
t1/2 = TX0.693
t0.5 = 23893 s
In conclusion, the half life
t0.5 = 23893 s
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How many chlorine atoms are on the products side of the reaction 2al 6hcl → 2alcl3 3h2? 2 3 6 9
The number of chlorine atoms present on the product side of the reaction is 6
What is a chemical equation?Chemical equations are representations of chemical reactions using symbols and formula of the reactants and 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.
How to determine the number of atoms of Cl2Al + 6HCl → 2AlCl₃ + 3H₂
Products => AlCl₃ and H₂
Number of Cl atoms = 2 × 3
Number of Cl atoms = 6 atoms
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Answer: 3. 6
Explanation: To put it simply
What is the name of NoCk4? Explain how you determined the bond type and the steps you used to determine the naming convention for the compound.
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How do you think plants would grow in space? Which tropism(s) would be affected and why?
Answer:
How do you think plants would grow in space? Which tropism(s) would be affected and why?
In the absence of gravity, plants use other environmental factors, such as light, to orient and guide growth. A bank of light emitting diodes (LEDs) above the plants produces a spectrum of light suited for the plants' growth. Enjoy don't fail :)
Explanation:
In an ecosystem like space where there is no gravity, geotropism would be affected .
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Balance the equation hbr + khco3 > h2o + kbr + co2
Answer:
It is already balanced
Explanation:
hbr + khco3 ===> h20 + kbr + co2 IS BALANCED
why are some voltaic cells called dry cells even though their chemistry involves water
Some voltaic cells are called dry because they do not have liquids in them.
Dry voltaic cellsThey are called dry because their electrolytes are usually in paste forms instead of aqueous form in which the electrolytes of wet cells are usually are.
The pastes in dry cells are made moist enough for the electric current to be able to flow through them.
Dry cells are advantageous because they are less heavy and one does not have to worry about the electrolyte spilling, unlike wet cells.
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How does the bronsted-lowry theory define acids and bases.
Answer:
an acid is a proton (H⁺) donor, and a base is a proton acceptor.
Explanation:
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What is a physical property?
O a characteristic of a substance that cannot be measured but can be observed
O a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
O a characteristic of a substance that cannot be measured or observed by conventional means
O a characteristic of a substance that can be measured or observed only by changing the chemical identity of the substance
Answer:
B. a characteristic of a substance that can be measured or observed without changing the chemical identity of the substance
Explanation:
The definition of a physical property is " a property (as color, hardness, boiling point) of matter not involving in its manifestation a chemical change."
The only choice that matches this description fully is the second one, or B, so that is the answer.
hope this helps!
. What is the molarity of a solution that was prepared by dissolving 80.0 g of CaCl2 (molar mass = 111.1 g/mol) in enough water to make 500 mL of solution?
Explanation:
Molarity = mol/L or g/L
Data:
Mass>80.0g
Mr of CaCl2>111.1g/mol
V>500mL
Convert mL to Litres;. mole=g/Mr
1L=1000mL. =80g/111.1g/mol
x=500mL. =0.720072007mol
x=0.5L
Molarity= mole/volume
=0.720072007mol/0.5L
=1.440144014mol/L
=1.4401mol/L
Hope this helps. Depending on the question you can also find it in g/L but mol/L is safer.
List earth and the gas giant planets from the hottest to the coldest planet
Answer:
1. Venus
471°C
2. Mercury
(430°C) during the day, (-180°C) at night
3. Earth
16°C
4. Mars
-28°C
5. Jupiter
-108°C
6. Saturn
-138°C
7. Uranus
-195°C
8. Neptune
-201°C
Explanation:
.
What is the molarity of an NaOH solution if 20. Milliliters of 2. 0 M HCl is required to exactly neutralize 10. Milliliters of the NaOH solution?
1.
1. 0 M
2.
2. 0 M
3.
0. 50 M
4
4. 0 M
Answer: 4
Explanation:
Lithium arsenate (Li3AsO4) and iron nitrate (Fe(NO3)3) are dissolved in water. What precipitate would be expected to form.
Then double displacement will happen
The reaction given by
[tex]\\ \rm\Rrightarrow Li_3AsO_4+Fe(NO_3)_3\longrightarrow LiNO_3+FeAsO_4[/tex]
Remember that nitrate ions and compounds are highly soluble in water like HNO_3 ,KNO_3.
So LiNO_3 remains dissolved in water or aqueous.
FeAsO_4 will be in solute form i.e precipitate
Sn=0.14 (E)
Sn+2 = -0.15(E)
Which form of tin is the stronger reducing agent? OS O Sn +2?
0.14
Explanation:
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What is the mass of one atom of nickel?
Answer:
58.6934
Explanation:
periodic table
Answer:
58.6934 u
Explanation:
You can find this from the atomic mass number on a Periodic Table, Nickel is 58.6934, therefore the mass of one atom of nickel is 58.6934 u.
Before the 1800s the europeans especially wanted to trade for in africa
Europeans wanted to trade things for rubber and oil with Africa
What happens to the following system at equilibrium when it experiences an increase or a decrease in temperature?
H₂O(l) + heat energy ⇌ H₂O(g)
Which activity gives access to natural resources but might lead to problems such as sinkholes?
A. commercial agriculture
B. fracking
C. traditional hunting
D. open-pit mining
Human activities such as fracking might lead to problems such as sinkholes
What are sinkholes?Sinkholes are openings that form on the surface ofb the earth when water washes away the surface rock or soil layer exposing caverns that have formed within the earth.
Fracking involves using superheated water underground in order to drill natural gas and petroleum from underground.
Human activities such as fracking has been proven to increase the incidence of sinkholes.
Therefore, it can be concluded that fracking might lead to problems such as sinkholes.
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Answer:
1. D. fracking
2. A. algae
3. B. Pollution from the mines makes its way into water sources for Native American tribes and other people in the state.
4. C. during the Industrial Revolution
5. C. pollution of waters from open-pit mining
Unit 8 Lesson 8: Impact of Chemical Processes Quick Check
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What is the difference between a strong alkali and a weak alkali?
Answer:
Strong Alkali – Is an alkali which dissociates – almost completely in aqueous solution thereby producing a – high concentration of hydroxyl [OH– ] ions.
Weak alkali – Is an alkali which dissociates – only partially in aqueous solution thereby producing a – low concentration of hydroxyl [OH–] ions.
If a reaction occurs, what will be the products of the unbalanced reaction
below
Cu(s) + Ni(NO3)2(aq) ➡️
A. CuNi(NO3)4(s)
B. No reaction will occur.
C. CuNi(s) + NO2(g)
D. Ni(s) + Cu(NO3)2(aq)
Answer:
B
Explanation:
Copper is lower on the activity series, so it can't replace nickel in this reaction. Therefore, no reaction will occur.
Interpret the following balanced chemical equations in terms of particles, moles, and mass.
Show that the law of conservation of mass is observed.
a. N2(g) + 3H2(g) - 2NH3(g)
b. HCI(aq) + KOH(aq) - KCI(aq) + H-O0
C. 2Mg(s) + 02(g) - 2MgO(s)
The equations obey the law of conservation of mass in that the number of moles of each component atom is balanced on both sides.
Law of conservation of massIt states that mass is conserved during chemical reactions.
For the first equation: [tex]N_2(g) + 3H_2(g) --- > 2NH_3(g)[/tex], there are 2 nitrogen and 6 hydrogen atoms on the reactant and product's side respectively. Thus, the number of atoms is conserved.
For the second equation: [tex]HCI(aq) + KOH(aq) -- > KCI(aq) + H_2O (l)[/tex], there are an equal number of H, Cl, K, and O atoms at the reactant and product's sides. The number of atoms is also conserved.
Lastly in the equation: [tex]2Mg(s) + O_2(g) - 2MgO(s)[/tex], the number of each atom is also balanced on both sides.
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Where t is time, N is the mass of the sample, and is the half-life (time it takes for half of the initial sample to decay). The half-life of Carbon-14 is about 5730 years. How many years would it take a 1000 gram sample to decay to only 400 grams
Answer:
see below
Explanation:
400 gm = 1000 gm (1/2)^n
.4 = (1/2)^n
n = 1.322 half lives = 7574.6 yrs
According to half life, 7574.6 years would it take a 1000 gram sample to decay to only 400 grams.
What is half life?Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.
400 gm = 1000 gm (1/2)[tex]^n[/tex]
.4 = (1/2)[tex]^n[/tex]
n = 1.322 half lives = 7574.6 yrs.
Thus, 7574.6 years would it take a 1000 gram sample to decay to only 400 grams.
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What are some instantaneous speed examples in an everday life!
Answer:
If you ask for water and water immediately appears that very second, this is an example of something instantaneous.
PLEASE HELP: You have been given 2.42 moles of beryllium sulfide (BeS), determine the mass in grams of beryllium sulfide that you have.
The mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS
Calculating mass of a compoundFrom the question, we are to determine the mass of the given beryllium sulfide.
From the given information,
Number of moles of beryllium sulfide (BeS) given = 2.42 moles
Using the formula,
Mass = Number of moles × Molar mass
Molar mass of BeS = 41 g/mol
Then,
Mass of BeS = 2.42 × 41
Mass of BeS = 99.22
Mass of BeS ≅ 99.2 g
Hence, the mass in grams of the given beryllium sulfide is 99.2 g. The correct option is the second option - 99.2 g BeS
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Most compounds that contain carbon can be placed in which chemical group?.
Answer:
Organic compounds
Explanations:
Organic compounds usually have carbon bonded with one or more of the following: hydrogen, nitrogen, or oxygen
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If a spoon of copper metal is placed in a solution of ferrous sulfate:
A. Iron will precipitate out
B. Copper will precipitate out
C. Copper and iron will precipitate
D. No reaction will take place
If a spoon of copper metal is placed in a solution of ferrous sulfate then no reaction will take place.
What is electrochemical series?Electrochemical series of metals is the series which gives idea about the reactivity of the metals if present in any solution of another metal.
Iron metal is placed at the top position with respect to the copper metal, means iron is more reactive than copper. So when a spoon of copper metal is placed in a solution of ferrous sulfate, copper will not able to displace the iron metals from its solution.
Hence no reaction will occur.
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Giving brainliest, please HELP!
Answer:
D = melting and vaporization
Explanation:
Pretend this is very cold ICE
A heat the ice up to melting point
B melt the ice to waterheat the water to boiling
D change water to steam
E heat the steam up (superheat the steam)
help please acids and basis
Let's see
[OH-] be x[tex]\\ \rm\Rrightarrow pOH=-log[OH-][/tex]
[tex]\\ \rm\Rrightarrow pOH=-logx[/tex]
[tex]\\ \rm\Rrightarrow 4.86=-logx[/tex]
[tex]\\ \rm\Rrightarrow logx=-4.86[/tex]
[tex]\\ \rm\Rrightarrow x=10^{-4.86}[/tex]
[tex]\\ \rm\Rrightarrow x=1.38M[/tex]
What is the name for this molecule? a skeletal model of an 8-carbon zig zag chain. there is a double bond between the first and second carbons. nonene nonane 1-octyne 1-octene
The name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.
Nomenclature of Organic compoundsFrom the question, we are to determine the name of the given molecule.
To name the compound, we will follow the IUPAC rules.
Some of IUPAC rules are
Find the longest continuous carbon chain. Determine the root name for this parent chain.For Alkenes (organic compounds with double bond), number the chain of carbons that includes the C=C so that the C=C has the lower position number. Change “ane” to “ene” and assign a position number to the first carbon of the C=C.The given compound has 8 carbons and a double bond. The root name of the compound is octane.
By IUPAC rules, the compound is an Octene.
Since the double bond is between carbon-1 and carbon-2. The compound becomes 1-octene.
Hence, the name of the compound by using the IUPAC nomenclature of organic compounds is 1 -octene. The correct option is the last option - 1-octene.
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The diagram for the compound is attached below.
Determine if the following are examples of Elements, Compounds, or Mixtures
Air
Answer:
Mixture
Explanation:
Air is a mixture, meaning it can be separated into its components without a chemical reaction taking place. In this case, it is a mixture of gases.
how many atoms are in 6.5 moles of zinc
Answer:
many atoms are in 6.5 moles of zinc? 6.5 moles. 6.02 x 10. 23 atoms =.
3 pages
Explanation:
The number of atoms in the 6.5 moles of zinc is equal to 39.15 × 10²³ atoms of zinc.
What is a mole?A mole is a scientific unit that is used to measure a large number of quantities of molecules, ions, atoms, or other particular particles. The number of particles or atoms in a mole is the same for almost all substances.
The number of entities present in one mole was experimentally found to be equal to 6.023 × 10 ²³, which is a constant. This number is termed as Avogadro’s number or Avogadro’s constant.
Given, the number of moles of zinc = 6.5 moles
The number of atoms of zinc in one mole = 6.023 × 10 ²³
Then 6.5 moles of zinc will have atoms of zinc = 6.023 × 10 ²³ × 6.5
= 39.15 × 10 ²³ atoms.
Therefore, the 39.15 × 10 ²³ Zinc atoms are in 6.5 moles of zinc.
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