Answer:
(C.) γ radiation
Explanation:
Gamma radiation, γ , does not consist of particles but a photon of energy. Hence, it has no mass or charge, allowing it to travel much faster than alpha or beta particles.
From the options, only γ-raiation does not have charge as opposed to positrons and protons which are + and beta which is either + or -.
Match each ion with the noble guess whose electron configuration it shares
Answer:
These should be matched to either: Helium, Neon, or Argon. Na+. Be2+. Ca2+. Cl-.
Explanation:
According to the electronic configuration, Li[tex]^+[/tex] and Be[tex]^2+[/tex] have electronic configuration similar to helium while N[tex]^3-[/tex],Na[tex]^2+[/tex],O[tex]^2-[/tex] have electronic configuration similar to neon and rest have electronic configuration similar to argon.
What is electronic configuration?
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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Aqueous sulfuric acid reacts with solid sodium hydroxide to produce aqueous sodium sulfate and liquid water . What is the theoretical yield of sodium sulfate formed from the reaction of of sulfuric acid and of sodium hydroxide
Answer:
71g (assuming experimental data)
Explanation:
The balanced equation for this reaction:
[tex]H_{2} SO_{4}(aq)[/tex] + [tex]2NaOH (s)[/tex] → [tex]Na_{2}SO_{4} (l)[/tex] + [tex]2H_{2} O (l)[/tex]
Molar mass of H2SO4 = 98.1 g/mol
molar mass of NaOH = 40g/mol
Molar mass of Na2SO4 = 142.04g/mol
⇒ 1 mole or 98.1g of H2SO4 will yield 1 ole of NaSO4; alternately, 2 moles or 49 ×2 = 80g of NaOH produces 1 mole of NaSO4.
Therefore, limiting reactant is NaOH.
Assuming actual experiment is 20g of NaOH,
1 mole - 40g
x moles - 20g = [tex]\frac{20}{40}[/tex] = 0.5 moles
⇒1 mole of Na2SO4 - 142.04g
∴ 0.5 moles = 142.04 × 0.5
= 71.02g
Answer:
71 grams
Explanation:
At the beginning of the reaction the forward reaction rate is ____ the reverse reaction rate
Answer:
The appropriate answer to the question in the discussion would be "negligible".
Explanation:
Equilibrium specifies "The state in something like a balanced or reversible equation where the frequency including forwarding public response seems to be equal or directly proportional to the rate of the backward process which is defined as the stable equilibrium".Initially, the rate including its reaction seems to be negligible. It's speeding up progressively.So that the above is the right answer.
Answer:
Greater than
Explanation:
Just took it on edge
A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons. element symbol: mass number: number of protons:
Answer:
Kr, mass number 81, number protons 36.
Explanation:
If the atom has 36 electrons, and it is neutral, it has 36 protons. 36 protons means that this element has atomic number = 36. This is Kr.
Mass number = number protons + number neutrons = 36 + 45 = 81
1. The symbol of the element is Kr
2. The mass number of the element is 81
3. The proton number of the element is 36
The answer to the question given above, is shown below:
1. Determination of the element symbol.Since the isotope is neutral, it means the atomic number (i.e the proton) and the number of electron are equal.
The isotope has 36 electrons. Therefore, the atomic number is also 36.
Element having atomic number of 36 from the periodic table is Krypton with the symbol of Kr.
2. Determination of the mass number.Neutron = 45
Atomic number = 36
Mass number =?Mass number = atomic number + Neutron
Mass number = 36 + 45
Mass number = 813. Determination of the number protonThe atomic number of an element is simply the proton. Thus,
Atomic number = 36
Proton = Atomic number = 36SUMMARY1. The symbol of the element is Kr
2. The mass number of the element is 81
3. The proton number of the element is 36
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The lava from a volcano can travel up to 100 km/hr if a village is located 3.6 mi from the volcano how many minutes will it take the lava to reach the village
Answer:
3.47 minutes
Explanation:
First we must convert the distance travelled from miles to kilometres
Since ;
1 mile= 1.6093 km
3.6 miles= 3.6 × 1.6093 km = 5.79 Km
Substitute this into
Speed= distance / time
Speed = 100Kmhr-1
Distance= 5.79 Km
Time= the unknown
Time = distance/speed
Time = 5.79/100
Time= 0.0579 hours
Since;
60 minutes make one hour
x minutes make 0.0579 hours
x = 60 × 0.0579 hours
x= 3.47 minutes
Which part of Dalton's atomic theory was disproved by Thomson's experiment?
O Atoms cannot be created, destroyed, or divided into smaller particles.
O Chemical reactions occur when atoms combine, separate, or rearrange.
O Compounds consist of atoms of different elements combined in simple, whole number ratios.
O All the atoms of an element are the same, but they are different from the atoms of other elements.
The part of Dalton's atomic theory that was disproved by Thomson's experiment is toms cannot be created, destroyed, or divided into smaller particles. The correct option is A.
What is Dalton's atomic theory?According to Dalton's atomic theory, atoms are tiny units of matter that make up all matter, including elements, compounds, and mixtures.
Following are some of the theory's postulates: All substance is made up of atoms, which are exceedingly tiny particles. Atoms belonging to the same element share the same mass and chemical composition.
Thomson presented the plum pudding model of the atom, which contained positively charged "soup" and negatively charged electrons inside.
Thus, the correct option is A. Atoms cannot be created, destroyed, or divided into smaller particles.
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Anne is afraid of lightning, but her father tells her that lightning is good for the soil on their farm. How does lightning help the soil?
O A.
The lightning raises the soil temperature.
OB
OC.
The lightning kills bugs in the soil.
The lightning helps produce oxidized forms of nitrogen such as nitrate.
The lightning sanitizes the water in the soil.
D
O E
The lightning makes the soil more acidic.
Answer:
I think it is...
The lightning helps produce oxidized forms of nitrogen, such as nitrate.
In an ecosystem, the lightning helps produce oxidized forms of nitrogen such as nitrate which nourishes the soil.
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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When 2-bromo-2-methylbutane is treated with a base, a mixture of 2-methyl-2-butene and 2-methyl-1-butene is produced. When potassium hydroxide is the base, 2-methyl-1-butene accounts for 45% of the product mixture. However, when potassium tert-butoxide is the base, 2-methyl-1-butene accounts for 70% of the product mixture. What percent of 2-methyl-1-butene would be in the mixture if potassium propoxide were the base
Answer:
The percentage mixture of 2-methyl-1-butene would be in between the 45% and 70%.
Explanation:
Potassium prop oxide is the intermediate base as compared to the potassium hydroxide which is less bulky strong base and potassium tert-butoxide which is bulky base. Bulky base can minimize the substitution reaction by causing hinders the approach of carbon attack and KOH is the strong base which less effective in minimizing the substitution reaction.
The mass of a compound is taken 5 times with the following results: 26.6mg, 26.3mg, 26.2mg, 26.4mg, and 26.1mg. If the true mass is 25.6mg, what is the percent relative error for this set of data? Round to the nearest hundredth of a percent.
Answer:
2.813%
Explanation:
First we must take the average of the five mass measurements
Average value= sum of all five trials/ 5= 26.6 + 26.3 + 26.2 + 26.4 +26.1 /3 = 26.32mg
Now, we have been provided the accurate mass of the compound in the question as 25.6mg
Remember that relative percent error = Average value of measurement - True value of measurement / true value×100
Hence we have;
Percent error=
26.32 - 25.6/25.6 ×100
Percent error= 2.813%
The percentage error is 2.813%
The calculation is as follows:The Average value is
[tex]= (26.6 + 26.3 + 26.2 + 26.4 +26.1)\div 3[/tex]
= 26.32mg
Now the percent error should be
[tex]= 26.32 - 25.6\div 25.6 \times 100[/tex]
= 2.813%
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