The given substance is sodium (Na) which has a molar mass of 22.98976928 g/mol. We can use this information along with the given value of cmol to find the mass of the substance in grams.
Therefore, the mass in grams of 1.553 cmol of sodium (Na) is 34.92 g.Explanation:To calculate the mass in grams of 1.553 cmol of sodium (Na), we can use the following formula:Mass = Molar mass × Number of moles (n)The given value of 1.553 cmol can be converted to moles by dividing it by the charge of the sodium ion (Na+) which is +1.
Therefore,1.553 cmol Na+ = 1.553 mol Na+To find the molar mass of sodium (Na), we look it up on the periodic table which is 22.98976928 g/mol.Molar mass (M) of Na = 22.98976928 g/molUsing the formula above, we can now calculate the mass of 1.553 cmol of sodium (Na).Mass = 22.98976928 g/mol × 1.553 mol= 34.92 gTherefore, the mass in grams of 1.553 cmol of sodium (Na) is 34.92 g (main answer).
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A landslide is a geological event caused by interactions between the four spheres. This landslide occurred after several weeks of steady rainfall. Explain how the landslide occurred in terms of potential energy and kinetic energy.
Answer: The rock and soil had gravitational potential energy at the edge of the road, overlooking the river. The rain added mass and caused the rock and soil to loosen. The rock and soil gained kinetic energy as it slid down into the river.
Explanation:
Answer:
The rock and soil had gravitational potential energy at the edge of the road, overlooking the river. The rain added mass and caused the rock and soil to loosen. The rock and soil gained kinetic energy as it slid down into the river
Explanation:
Select all reactants that could be used to prepare benzoic acid. Multiple select question. Na/NH2 Reactant B Reactant A O3, (CH3)2S KMnO4, OH–
The reactants that could be used to prepare benzoic acid are Reactant A and KMnO4, OH–.
The reaction to prepare benzoic acid typically involves the oxidation of a side chain of a benzene ring. Reactant B, which is benzyl chloride (C6H5CH2Cl), is commonly used as the starting material for this reaction.
Benzyl chloride is first converted to benzaldehyde by treatment with a strong oxidizing agent, such as KMnO4 or O3/(CH3)2S. Benzaldehyde is then further oxidized to benzoic acid by the same oxidizing agents or by reaction with Na/NH2.
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Identify reagents that can be used to convert acetylene into 2-pentyne. A 1) NaNHz; 2) CH3l; 3) NaNH2; 4) CH3! B 1) NaNHz; 2) CH3l; 3) NaNH2; 4) CH3CH2! C 1) NaNH2; 2) CH3l; 3) CH3CH2! D 1) excess NaNH2; 2) excess CH3!
Reagents to convert acetylene into 2-pentyne are found in 1) NaNH₂; 2) CH₃I; 3) NaNH₂; 4) CH₃CH₂I.
So, the correct answer is B.
To synthesize 2-pentyne from acetylene, you need to perform two nucleophilic substitution reactions. First, acetylene is treated with NaNH₂ (sodium amide), a strong base, which removes a hydrogen atom from acetylene, generating an acetylide anion. This anion acts as a nucleophile and reacts with CH₃I (methyl iodide), forming 1-butyne. Then, 1-butyne is treated again with NaNH₂, generating another acetylide anion. Finally, this anion reacts with CH₃CH₂I (ethyl iodide), yielding the desired product, 2-pentyne.
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Rewrite the following procedure using improved scientific language and in proper format: First I broke 2 eggs into a bowl and mixed them up really good. Then I added some oil and water. After that I mixed the cake mix until everything looked the same, then it went in the oven for a bit.
The batter was then transferred to a baking dish and placed in the oven for the required baking time.
What is Carbon dioxide?
Carbon dioxide (CO2) is a colorless, odorless gas that is naturally present in the Earth's atmosphere. It is composed of one carbon atom bonded to two oxygen atoms, and is a byproduct of respiration, combustion, and other chemical reactions. CO2 is important for plant growth and is also a greenhouse gas, contributing to the warming of the Earth's atmosphere.
To prepare the cake batter, two eggs were cracked into a mixing bowl and beaten thoroughly. Next, a suitable amount of oil and water were added to the mixture. The cake mix was then slowly added and stirred until it formed a homogeneous mixture.
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The distance to the moon is 238,855 miles. How many meters is this? Record your answer in scientific notation.
Answer:
384399861 meters
Explanation:
What is the mass of 5.119 102 molecules of copper sulfate
(CuSO4)?
Answer:
Mass = 135.66 ×10⁻²¹ g
Explanation:
Given data:
Number of molecules of CuSO₄= 5.119×10²
Mass of CuSO₄= ?
Solution:
The given problem will solve by using Avogadro number.
1 mole contain 6.022×10²³ molecules
5.119×10² molecules ×1 mol / 6.022×10²³ molecules
0.85×10⁻²¹ mol
Mass in grams:
Mass = number of moles × molar mass
Mass = 0.85×10⁻²¹ mol × 159.6 g/mol
Mass = 135.66 ×10⁻²¹ g
If you have copper atoms with a +2 charge and covalently bonded molecules with 1 phosphorus and 4 oxygen atoms, what would be the proper chemical formula of the compound?
The final chemical formula will be Cu3(PO4)2. The chemical formula for a compound of copper atoms with a +2 charge and covalently bonded molecules with 1 phosphorus and 4 oxygen atoms is Cu3(PO4)
1. The phosphorus oxide group is covalently bonded to form the PO4 molecule, which has a -3 charge as a whole, due to the presence of four oxygen atoms that have a -2 charge. The Cu2+ ions balance the PO43- ions to create a compound with a neutral charge.
There are two PO43- ions in the formula, which means there are eight oxygen atoms and two phosphorus atoms. To make the formula electrically balanced, there must be three copper atoms, each with a +2 charge.
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A World Health Organization study of health in various countries reported that in Canada, systolic blood pressure readings have a mean of 121 and a standard deviation of 16 . A reading above 140 is considered to be high blood pressure. Complete parts a through d below. a. What is the z− score for a blood pressure reading of 140 ? z= (Round to two decimal places as needed.) b. If systolic blood pressure in Canada has a normal distribution, what proportion of Canadians suffers from high blood pressure? The proportion of Canadians with high blood pressure is (Round to four decimal places as needed.) c. What proportion of Canadians has systolic blood pressure in the range from 100 to 140 ? The proportion with systolic blood pressure between 100 and 140 is (Round to four decimal places as needed.) d. Find the 85 th percentile of blood pressure readings. The 85 th percentile of blood pressure readings is
The 85th percentile of blood pressure readings is approximately 137.64. a. To calculate the z-score for a blood pressure reading of 140, we can use the formula:
z = (x - μ) / σ
where x is the value (140 in this case), μ is the mean (121), and σ is the standard deviation (16).
Substituting the values into the formula:
z = (140 - 121) / 16
z ≈ 1.19 (rounded to two decimal places)
b. To find the proportion of Canadians with high blood pressure, we need to calculate the area under the normal distribution curve for values above 140. This can be done by finding the cumulative probability using the z-score.
Using a standard normal distribution table or a calculator, we can find that the cumulative probability corresponding to a z-score of 1.19 is approximately 0.881.
Therefore, the proportion of Canadians with high blood pressure is approximately 0.881 (rounded to four decimal places).
c. To find the proportion of Canadians with systolic blood pressure in the range from 100 to 140, we need to calculate the area under the normal distribution curve between these two values.
Using the z-scores corresponding to 100 and 140, we can find the cumulative probabilities for each value. The cumulative probability for a z-score of -1.25 (corresponding to 100) is approximately 0.105, and the cumulative probability for a z-score of 1.19 (corresponding to 140) is approximately 0.881 (as calculated in part b).
The proportion with systolic blood pressure between 100 and 140 is the difference between these two probabilities:
Proportion = 0.881 - 0.105 ≈ 0.776 (rounded to four decimal places)
d. The 85th percentile represents the value below which 85% of the blood pressure readings fall. To find the 85th percentile, we need to determine the z-score that corresponds to an area of 0.85 under the normal distribution curve.
Using a standard normal distribution table or a calculator, we can find that the z-score corresponding to an area of 0.85 is approximately 1.04.
To find the actual blood pressure reading at the 85th percentile, we can use the z-score formula:
x = μ + (z * σ)
Substituting the values:
x = 121 + (1.04 * 16)
x ≈ 137.64
Therefore, the 85th percentile of blood pressure readings is approximately 137.64.
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Draw the three alkenes, each of formula c5h10 , that will form 2‑methylbutane upon hydrogenation.
The three alkenes :-
2 methyl 1 butene
2 methyl 2 butene
2 methyl 3 butene
Hydrogenation is a chemical reaction between molecular hydrogen (H2) and any other compound or element, normally within the presence of a catalyst together with nickel, palladium or platinum. The method is normally employed to reduce or saturate natural compounds.
Alkenes are a category of hydrocarbons (e.g, containing handiest carbon and hydrogen) unsaturated compounds with as a minimum one carbon-to-carbon double bond. any other term used to describe alkenes is olefins. Alkenes are greater reactive than alkanes because of the presence of the double bond.
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A solution has [OH-]=3.5*10^-6. Based on that, what must be true about this solution?
Answer:
Option B. It is a basic solution.
Explanation:
To know which option is correct, let us calculate the pH of the solution.
First, we shall determine the pOH of the solution. This is illustrated below:
Concentration of Hydroxide ion, [OH¯] = 3.5×10¯⁶
pOH =.?
pOH = –Log [OH¯]
pOH = –Log 3.5×10¯⁶
pOH = 5.5
Finally, we shall determine the pH. This can be obtained as follow:
pOH = 5.5
pH =?
pH + pOH = 14
pH + 5.5 = 14
Collect like terms
pH = 14 – 5.5
pH = 8.5
The pH scale reads as follow:
0 to 6 => Acidic
7 => Neutral
8 to 14 => Basic
Comparing the pH of the solution (i.e 8.5) with the pH scale, we can conclude that the solution is basic because the pH of solution lies between 8 and 14.
A student set up the experiment shown below to determine if radish seeds take in oxygen as they germinate. Methylene blue is a chemical that is blue when oxygen is present but is colorless when oxygen is not present. Containers A and B each contained 200 mL of water and 10 drops of methylene blue. Ten radish seeds were added to container A. Container B had no radish seeds.
Ten radish seeds were added to container A. Container B had no radish seeds. The purpose of the container B in this experiment is to serve as a control container.
What is the purpose of the control in the experiment?By using controls, the experimenter can reduce the impact of factors other than the one being researched. This allows us to verify that an experiment is testing what it says it is testing. Controls are important for all sorts of experimental testing, regardless of the subject, and this goes beyond science.
What are the purpose of Methylene blue's function as a markerMethylene blue is usually employed as a redox indicator in analytical chemistry. The solutions of this chemical are blue when in an oxidizing environment, but turn colorless when exposed to a reducing agent.
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the reaction between methanol and oxygen gas produces water vapor and carbon dioxide. 2ch3oh(l) 3o2(g)⟶4h2o(g) 2co2(g) three sealed flasks contain different amounts of methanol and oxygen.
The reaction between methanol and oxygen gas produces water vapor and carbon dioxide according to the balanced chemical equation: 2CH3OH(l) + 3O2(g) ⟶ 4H2O(g) + 2CO2(g).
The given chemical equation represents the combustion reaction of methanol (CH3OH) with oxygen gas (O2). In this reaction, two molecules of methanol react with three molecules of oxygen gas to produce four molecules of water vapor (H2O) and two molecules of carbon dioxide (CO2).
The coefficients in the balanced chemical equation indicate the stoichiometric ratios between the reactants and products. This means that for every two molecules of methanol and three molecules of oxygen gas, four molecules of water vapor and two molecules of carbon dioxide are produced. The equation also shows that the reaction occurs in the gas phase.
The reaction between methanol and oxygen is an example of an exothermic reaction, releasing energy in the form of heat and light. Methanol serves as the fuel source, while oxygen acts as the oxidizing agent. The combustion of methanol is a common process used in various applications, such as fuel cells and internal combustion engines.
By understanding the balanced chemical equation and the stoichiometry of the reaction, chemists can predict the amounts of reactants consumed and products formed. This information is crucial for designing and optimizing chemical processes and understanding the energy transformations involved.
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These two finches share a common ancestor from South America. What is the most likely way that one ancestral finch species will develop into two distinct species?
A The ancestral species was genetically engineered to become two new species
B Groups of the ancestral species became isolated and adapted to different environments.
C. Two individual birds acquired many spontaneous mutations.
D. The ancestral species mated with other species and the offspring resulted in two new species.
Answer:
The correct answer is - B. Groups of the ancestral species became isolated and adapted to different environments.
Explanation:
Two finches Warbler Finch and Woodpecker Finch are two distinct finches are finches from the Galapagos Islands. Both of these finches have a common ancestor from South America.
The most likely explanation of developing two distinct species from an ancestral finch is by bein isolated and developed or adapted according to the challenges and environmental conditions and ultimately become different species after several generations.
On a phase change diagram, such as a heating or cooling curve, the horizontal line
indicates a time when the temperature of the substance is staying the same.
True or false
Io and europa exhibit geological activity. What is the heat source for this activity?.
Geological activity may be seen throughout Lo and Europe. Volcanoes are the source of heat for this activity.
What exactly is a geological activity?Both Io and Europa are geologically active. Volcanoes might be seen in Voyager photographs of Io. In truth, it is the most volcanically active planet in the solar system, with a shortage of craters as a result of frequent resurfacing.
Jupiter's rocky moon. Io is the most volcanically active planet in the solar system, with hundreds of volcanoes erupting lava fountains dozens of miles (kilometers) high.
Dynamic activities or occurrences at the Earth's surface caused by gravity, temperature variations, thawing and freezing chemical reactions, seismic vibrations, and the agents of wind, flowing water, ice, and snow.
Internal heat is what drives geological activity, and Earth retains a significant amount of it due to its exceptionally large size for a terrestrial planet. This heat encourages mantle circulation and keeps the lithosphere thin, resulting in active surface geology.
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it takes 16 min for a 10 ml sample of an unknown gas to effuse thtogh a pinhole. a 10 ml sample of he required 5 min. what is the molecular weight of the gas?
The molecular size of something like the unidentified molecule is 44.1 since it is calculated as earth's weight metric kilogram of the electrons needed to make one molecule per mole. Molar mass is expressed in grams for mole.
What is the name for molecular weight?
Molecular weight, commonly known as molecular mass, is the concentration of a particular chemical molecules, calculated using the atomic weight of carbon-12, which is 12. In actuality, it is determined by adding the atoms' atomic weights.
How do physical properties and chemical weight compare?
Additionally, the primary distinction between the two is whether mole ratio provides the amount of a mole of a certain material. In contrast, molecular weight refers to a substance's molecule's mass. Although number of moles has a separate definition and measurement system
Briefing:
rate = distance / time
let consider both travelled a distance d.
So, rate of Unknown gas = d / 16.6 min
rate of He = d / 5.00 min
From Grahams law of effusion,
rate1(Unknown gas ) / rate 2 (He) = √ MW 2 (He) / MW1 (Unknown) , MW = molecular weight
(d / 16.6 min) / (d / 5.00 min) = √ MW (He) / MW(Unknown)
0.301 = √ MW (He) / MW(Unknown)
(0.301)² = MW (He) / MW(Unknown)
MW(Unknown) = MW(He) / (0.301)²
= 4 / (0.301)²
= 44.1
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NaOH is an Arrhenius base because it increases the concentration of hydroxide ions when dissolved in a solution?
Yes, NaOH is an Arrhenius base because it increases the concentration of hydroxide ions when dissolved in a solution.
According to Arrhenius theory proposed by Swedish chemist Svante Arrhenius defines that an acid is the substance that increases the concentration of hydrogen ions (H+) ions in a solution, while a base is a substance that increases the concentration of hydroxide ions (OH-) ions in a solution.
When NaOH is dissolved in water, it dissociates in sodium ions (Na+) and hydroxide ions (OH-). The presence of hydroxide ions in the solution makes it basic. The hydroxide ions are responsible for increasing the concentration of the hydroxide ions (OH-) in the solution making NaOH an Arrhenius base.
The dissociation of NaOH in water can be represented by the following equation:
[NaOH (s)] → [Na+ (aq)]+ [OH- (aq)]
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if i take 2 tables two times per day with 300 tables how many days will my prescription last
Answer:
150
Explanation:
300 divided by 2
Which bodies of water serve as a source of drinking water for some u. S. And canadian cities, and are facing serious pollution problems?.
The bodies of water that serve as a source of drinking water for some U.S. and Canadian cities, and are facing serious pollution problems are the Great Lakes.
Five of the Great Lakes serve as a source of drinking water for some U.S. and Canadian cities and are facing serious pollution problems. The Great Lakes are the largest surface freshwater system on Earth, comprising 84% of North America's fresh surface water. Pollution sources include agricultural runoff, industrial discharge, sewage treatment plants, oil and gas pipelines, and ship traffic.
These sources of pollution have caused toxic algae blooms, beach closures, and fish kills that threaten the health of the lakes and the communities that depend on them. In addition, microplastics have become a growing concern, as they can accumulate in the food chain and potentially harm human health.
Efforts are being made to reduce pollution through regulation, technological advancements, and public awareness, but much work remains to be done to ensure the long-term health of the Great Lakes and the people and wildlife that depend on them.
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Toll-like receptors differ from scavenger receptors in that they Select one: a. bind to common repetitive arrays on microbial surfaces. b. stimulate a pathway that causes enzymatic degradation of the microbe to which they bind. c. are soluble receptors that bind to microbes in extracellular spaces. d. mediate signal transduction pathways, causing cytokine production.
Toll-like receptors differ from scavenger receptors in that they mediate signal transduction pathways, causing cytokine production (option d).
Toll-like receptors (TLRs) and scavenger receptors (SRs) are two different types of receptors involved in the recognition of microbial pathogens by the immune system. TLRs are membrane-bound receptors that recognize specific pathogen-associated molecular patterns (PAMPs) on the surface of microorganisms, such as bacteria and viruses. In contrast, SRs are primarily involved in the uptake and clearance of apoptotic cells, oxidized lipids, and other cellular debris.
One key difference between TLRs and SRs is that TLRs bind to common repetitive arrays on microbial surfaces, whereas SRs recognize a wide variety of ligands. Additionally, TLRs stimulate a signal transduction pathway that leads to the production of cytokines, while SRs typically do not. Answer option d.
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which set shows the correct resonance structures for seo2?
The actual molecule of SeO2 is a resonance hybrid of the two resonance structures. In the correct resonance structure (B), there is a double bond between each oxygen atom and the selenium atom. This gives SeO2 a resonance hybrid that is the average of the two resonance structures.
Resonance structure is a hypothetical structure which represents the actual bonding in a molecule. It is different from the actual structure but provides a better description of the bonding in the molecule. The correct resonance structures for SeO2 are:
A: It is incorrect as it has an extra double bond.
B: It is the correct resonance structure of SeO2
C: It is incorrect as it has no resonance effect in the molecule.
D: It is incorrect as it has an extra double bond, which is not present in the actual molecule.
In the actual molecule, the Se atom is bonded to two O atoms, and each O atom is bonded to Se by a double bond. Therefore, the actual molecule of SeO2 is a resonance hybrid of the two resonance structures. In the correct resonance structure (B), there is a double bond between each oxygen atom and the selenium atom. This gives SeO2 a resonance hybrid that is the average of the two resonance structures.
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The two resonance structures for SeO2 (selenium dioxide) depict the different ways the bonds and electrons could be arranged within the molecule. The molecule has a V-shape with Selenium at the center, connected to two Oxygen atoms. The delocalization of pi electrons is shown by two major resonance structures.
Explanation:The resonance structures for the compound SeO2 (selenium dioxide) are determined by the placement of electrons and bonds within the molecule. A molecule can have multiple possible structures, known as resonance structures, which depict the various ways that bonds and electrons can be arranged.
The molecule SeO2 features a V-shaped molecular geometry, with the Selenium (Se) atom at the center connected to two Oxygen (O) atoms, and has two pairs of lone electrons on Selenium. There are two major resonance structures: one with a double bond between Selenium and one Oxygen atom, and a single bond with the other Oxygen atom, and another with the positions of these bonds reversed. This shows the delocalization of pi electrons.
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I would like to know if question number 3 is rite
The balanced reaction of this chemical reaction is as follows :
\(2HClO_4(aq)\text{ + Ba}(OH)_2(aq)\text{ }\Rightarrow Ba(ClO_4)_2(aq)+2H_2O(l)\text{ }\)• As we can see, this is a double-displament reaction
Would you consider using a 5mm electrode for vertical up root runs in a 6g (hl045) fixed position pipe?
No, I would not consider using a 5mm electrode for vertical up-root runs in a 6g (hl045) fixed-position pipe.
This is because a 5mm electrode is too large for this type of welding, and can result in a lack of penetration and a weak weld. Instead, a smaller electrode, such as a 3.2mm or 2.5mm, would be a better choice for this application. These smaller electrodes allow for better control and penetration, resulting in a stronger weld. Additionally, it is important to use the correct welding technique and travel speed when performing vertical up-root runs in a 6g (hl045) fixed-position pipe to ensure a strong and secure weld.
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what are the names given to each part of the picture indicated above
What is the number of moles of KF in a 29-gram sample of the compound?
A) 1.0 mol
B) 2.0 mol
C) 0.50 mol
D) 5.0 mol
Answer:
C. 0.50 mol
Explanation:
Number of mole= mass /molar mass
Mass of KF is given as 29g
The molar mass of KF= 39+19= 58g/mol
No of mole= mass/ molar mass
= 29g/58g/mol
1/2 mol= 0.5 mol
Answer:
C) 0.50 mol
Explanation:
Hello,
In this case, we study this mole-mass relationship by using the molar mass of potassium fluoride (KF) which is 58.1 g/mol to compute the required number of moles in the 29-g sample as shown below:
\(n_{KF}=29gKF*\frac{1molKF}{58.1gKF} \\\\n_{KF}=0.50molKF\)
Therefore answer is C) 0.50 mol.
Best regards.
Which of the following reactants can oxidize sodium?
lithium
barium
aluminum
potassium
Answer:
The answer is Aluminum
Hope this helps you
Optical fibres are generally composed of silica, which has a refractive index of 1.44. How
fast does light travel in silica fibre?
Answer:
from formula,
n = speed of light
speed of light in medium
In Silica,
1.44 = (3e8m/s)/v
v= (3e8m/s)/1.44
v = 20.83e7m/s
v = 20.8 × 10^7m/s.
Light travels in silica at 20.8 × 10^7 m/s.
I need help with problems 11-13 please. I’m very confused on how to find Volume when there’s no specific shapes and numbers.
Answer:
To find volume you can either look at the displacement of the water or Length•Width•Height
Explanation:
11) 12
12) 340 mL
13) 196 m\
What is a key difference between chemical and nuclear reactions?
A. In chemical reactions, new compounds are formed. In nuclear reactions, compounds are destroyed.
B. Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.
C. Chemical reactions involve large changes in energy. Nuclear reactions absorb or release small amounts of energy.
D. In chemical reactions, only alpha radiation is emitted. In nuclear reactions, alpha, beta, and gamma decay may occur.
Answer:
B
Explanation:
Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.
Answer:
B
Explanation:
why is a sodium a metal?
Answer:
YesEdit: sorry I thought you asked "Is Sodium a metal?" It is a metal because it is on the left side of the periodic table and it has metallic properties such as:
It is malleable
Shiny when polished
Forms positive ions when it reacts
And has a high boiling pointpoint
Explanation: