The ratio of the mass of compounds:
a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl = 46 + 70 → 46 : 70
b. H[tex]_{2}[/tex]O + NaO → 2NaOH = 1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O = 1 : 35 + 23 : 35 → 23 : 35 + 1: 8
What is a molecular mass?
Molecular mass refers to the total sum of the masses of the atoms or components that make up the molecule.
Calculation:
a. 2Na + Cl[tex]_{2}[/tex] → 2NaCl
The atomic mass of Na= 23The atomic mass of Cl= 35(Na x 2) + (Cl x 2) → (Na x 2) : (Cl x 2)
(23 x 2) + (35 x 2) → (23 x 2) : (35 x 2)
46 + 70 → 46 : 70
b. H[tex]_{2}[/tex]O + NaO → 2NaOH
The atomic mass of H = 1The atomic mass of O= 16Atomic mass of Na= 23(H x 2) : (O x 1) + (Na x 1) : (O x 1) → (Na x 2) : (O x 2) : (H x 2)
(1 x 2) : (16 x 1) + (23 x 1) : (16 x 1) → (23 x 2) : (16 x 2) : (1 x 2)
2 : 16 + 23 : 16 → 46 : 32 : 2
1 : 8 + 23 : 16 → 23 : 16 : 1
c. HCl + NaOH → NaCl + H[tex]_{2}[/tex]O
The atomic mass of H= 1The atomic mass of Cl= 35The atomic mass of Na= 23The atomic mass of O= 16(H x 1) : (Cl x 1) + (Na x 1) : (Cl x 1) → (Na x 1) : (Cl x 1): (H x 2) : (O x 1)
(1 x 1) : (35 x 1) + (23 x 1) : (35 x 1) → (23 x 1) : (35 x 1) : (1 x 2) : (16 x 1)
1 : 35 + 23 : 35 → 23: 35 + 2: 16
1 : 35 + 23 : 35 → 23 : 35 + 1: 8
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How many protons, neutrons, and
electrons are in an atom of bervllium with
a mass number of
9? Use a periodic table.
a.4 protons, 4 electrons, 5 neutrons
b. 4 protons, 4 electrons, 4 neutrons
c. 5 protons, 5 electrons, 4 neutrons
d. 4 protons, 4 electrons, 9 neutrons
Your answer is 4 protons 4 electrons and 5 neutrons
Based on the information in the table, which of the following arranges the bonds in order of decreasing polarity?
Polarity is the chemical property based on the electric charge and orientation of the poles. Al−O>H−Br>As−S is arranged in decreasing order of polarity. Thus, option d is correct.
What is polarity?Polarity is a chemical property of the distribution of the electrical charges over their respective atom in the molecule joined by the bonds. The relation between the polarity and the difference in electronegativity is directly proportional.
The electronegativity difference between the elements are:
Al−O = 1.8H−Br = 0.8As−S = 0.4As the electronegativity difference between Al−O = 1.8 is the highest it will have the highest polarity followed by H−Br = 0.8, and As−S = 0.4, with the lowest polarity.
Therefore, option D. Al−O>H−Br>As−S is arranged in decreasing order of polarity.
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When water evaporates, the energy that was used to evaporate the water is stored as ____________________ in the evaporated water.
Answer:
The energy that was used to evaporat the water is stored as sensible heat in the evaporated water
When water vapor condenses during the formation of clouds, energy releases into the atmosphere through latent heating.
Before attaching the rubber hosing to the side-arm Erlenmeyer flask it should be ___ to a universal stand to prevent tipping.
Precautions to observe when hosing rubber:
Before attaching the rubber hosing to the side-arm Erlenmeyer flask it should be "higher than one centimeter" to a universal stand to prevent tipping.
Erlenmeyer flask:
These are used to quickly filter liquids in a variety of general laboratory tasks. Conical flasks with flat bottoms, tapered necks, and sidearms for vacuum filtration are typical flask designs.Ideal for distillation, fractionation, reflux, and extraction.most frequently made from borosilicate glass, which has robust walls and pressure resistance in vacuum.The flasks are frequently used in association with other items, such as a Buchner funnel or ring that is fitted through a rubber bung. The sidearm, which has barb-like rings on the tip to enable attachment to vacuum tubing, can be either fixed to the flask or removable. The production of the flasks can be done using alternative materials, like polystyrene, depending on the use. There are numerous capacities and socket sizes for filtering flasks.Learn more about the Erlenmeyer flask here,
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How many individual oxygen atoms are contained in a sample of P2O5 that also
contains 0.620 moles of P? (Input your answer with scientific notation using "e-
The number of atoms of oxygen in the sample of P2O5 is 9.33 * 10²³ atoms.
What mole of oxygen atoms are in P2O5?A mole of the compound P2O5 contains 5 moles of atom of oxygen and 2 moles of P.
Moles of oxygen in the sample = 0.620 * 5/2 = 1.55 moles of oxygen atoms.
The number of oxygen atoms in 1 mole of oxygen atoms is given by the Avogadro number = 6.02 * 10²³
Number of atoms of oxygen in 1.55 moles -= 1.55 * 6.02 * 10²³ = 9.33 * 10²³ atoms.
Therefore, the Avogadro number is important in determining number of atoms in a compound.
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7. Explain how magnetic potential energy can be transformed into kinetic energy. (1
point)
A 120-milliliter mixture of Chemical X and water contained 40 percent Chemical X. A part of the mixture was removed and replaced with an equal quantity of water. If the resulting mixture contained 10 percent Chemical X, what is the volume of the mixture that was removed
The volume of the mixture that was removed is 90ml
Given that chemical percentage present in 120 ml of mixture = 40%
and resulting mixture contained 10% of Chemical X = 120 * 0.1 = 12ml
Volume is the quantity of three-dimensional space occupied by a liquid, solid, or gas. Common units used to express volume include liters, cubic meters, gallons, milliliters, teaspoons, and ounces, though many other units exist.
Let us assume that y be the volume of mixture removed
Therefore, we can re-write the equation as
0.4(120 - y) = 12
y = 90ml
Hence, 90ml was removed from the mixture
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The answer is 90 ml removed
How many grams of silver chromate will precipitate when 150. mL of 0.500 M silver nitrate are added to 100. mL of 0.400 M potassium chromate
The amount of silver chromate that precipitates after addition of solutions is 12.44 g.
Number of moles:
The number of moles is the product of molarity of the solution and its volume. The formula is expressed as:
Moles = Molarity x Volume
Calculations:
Step 1:
The molecular formula of silver nitrate is AgNO3. The number of moles of silver nitrate is calculated as:
Moles of AgNO3 = 0.500 M x (150/1000) L
= 0.075 mol
Step 2:
The molecular formula potassium chromate is K2CrO4. The number of moles of potassium chromate is calculated as:
Moles of K2CrO4 = 0.400 M x (100/1000) L
= 0.04 mol
Step 3:
The balanced chemical reaction between AgNO3 and K2CrO4 is:
2AgNO3 + K2CrO4 -----> Ag2CrO4 + 2KNO3
The required number of moles of K2CrO4 = 0.075 mol/2 = 0.0375 mol
The given number of moles of K2CrO4 (0.04 mol) is more than the required number of moles (0.0375 mol). Therefore, AgNO3 is the limiting reagent.
Step 4:
According to the reaction, the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Hence, the number of moles of Ag2CrO4 formed is 0.0375 mol.
The molar mass of Ag2CrO4 is 331.74 g/mol.
The mass of Ag2CrO4 is calculated as:
Mass = 0.0375 mol x 331.74 g/mol
= 12.44 g
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Please refer to the picture. Thank you!
The reaction which shows the beta particle being emitted is:
¹⁶⁸₆₈Er ⇒ ¹⁶⁸₆₇Ho + β⁰₋₁
What is Beta decay?This involves the emission of a beta particle as a result of the ratio of neutrons to protons in the nucleus being too high.
The element which is produced as a result of the beta particle emission is referred to as Holmium.
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The radioactive decay of a sample containing an unknown radioactive isotope produced 6608 disintegrations per minute. 7.29 days later, the rate of decay was found to be 2932 disintegrations per minute. Calculate the half-life in days for the unknown radioactive isotope.
The half life is 0.47906yr
The uncertainty principle governs radioactive decay, making it impossible to predict with precision when a given nucleus will split apart and release a particle.
However, we can estimate the likelihood that a nucleus will dissolve in a specific amount of time.
We can foretell what portion of a huge number of nuclei will dissolve during that time.
Regardless of the isotope's quantity, this fraction will fluctuate based on each isotope's stability.
Alternatively, we can consider the issue in terms of how long it will take a specific fraction of an isotope to dissociate.
We have r0 = 6608 min–1 g–1, while r = 2932 min–1 g–1, and t = 7.29 days. Substituting into
we then have
ln r/r0 = −0.693*t / t1/2
ln (2932/6603) = -0.693 * 7.29 / t1/2
ln (0.44404) = -0.693*7.29/t1/2
t1/2 = (-0.693/-0.8118) * 7.29days
t1/2= 0.8536*7.29days
1yr = 28.1yrs
0.0199yr (7.29days) = 0.56123yr
t1/2 = 0.8536*0.56123
Half Life = 0.47906yr.
Hence the half life is 0.47906yr
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Why are the two equilibrium reactions below not affected by an increase in pressure?
An increase in pressure does not affect the reaction because the moles of reactants and products or the pressure of the forward reaction are equal at equilibrium.
What is chemical equilibrium?A chemical reaction is in equilibrium if the rate of the backward reaction and the forward reaction are equal.
Pressure affects the equilibrium position of chemical reactions involving gases.
For the given reactions in equilibrium, moles of reactants and products and hence, the pressure of the forward reaction are equal at equilibrium, therefore, an increase in pressure does not affect it.
Therefore, an increase in pressure will only affect the equilibrium of a reaction in which the pressure varies in the forward and backward reaction.
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A/n ____ replacement is when a metal replaces a metal in a single replacement chemical reaction.
Select one:
a.
acid
b.
anion
c.
cation
d.
base
anion
the reaction is called single displacement whereby an element is substituted by another in a compound
A cation replacement is when a metal replaces a metal in a single replacement chemical reaction.
What is chemical reaction?
Chemical reactions are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical reaction.
There are several characteristics of chemical reactions like change in color, change in state , change in odor and change in composition . During chemical reaction there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
There are three types of chemical reactions:
1) inorganic reactions
2)organic reactions
3) biochemical reactions
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An alkene adds hydrogen in the presence of a catalyst to give 3,4-dimethylhexane. Ozonolysis of the alkene followed by treatment with zinc and acetic acid gives a single organic product. The structure of the alkene is: CH3 CH3CH
The structure of alkene is given below in the image.
Alkenes are described as both branched or unbranched hydrocarbons that possess at least one carbon-carbon double bond (CC) and feature a popular system of CnH2n [1].
Alkanes are organic compounds that encompass single-bonded carbon and hydrogen atoms. The formulation for Alkanes is CnH2n+2, subdivided into 3 companies – chain alkanes, cycloalkanes, and branched alkanes.
The geometry around each carbon atom is based totally on a trigonal planar shape, due to the fact, that each carbon has three electrons around it. This must make the angle of each bond one hundred twenty.
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In the laboratory, a student dilutes 13.5 mL of a 11.6 M hydroiodic acid solution to a total volume of 100.0 mL. What is the concentration of the diluted solution
Answer: The concentration of the diluted solution is 1.566M.
Explanation:
The dilution equation is presented as this: [tex]M_{s} V_{s} =M_{d} V_{d}[/tex].
·M= molarity (labeled as M)
·V= volume (labeled as L)
·s= stock solution (what you started with)
·d= diluted solution (what you have after)
Now that we know what each part of the formula symbolizes, we can plug in our data.
[tex]11.6M*13.5mL=M_{d} *100mL[/tex]
We cannot leave it like this because the volumes must be in Liters, not milliliters. To convert this, we divide the milliliters by 1000.
[tex]13.5mL/1000=0.0135L[/tex] [tex]100mL/1000=0.1L[/tex]
Now that we have the conversions, let's plug them into the equation.
[tex]11.6M*0.0135L=M_{d} *0.1L[/tex]
The only thing that we need to do now is actually solving the answer.
[tex]M_{d} =\frac{11.6M*0.0135L}{0.1L}[/tex] [tex]M_{d} =1.566M[/tex]
From the work shown above, the answer is 1.566M.
I hope this helps!! Pls mark brainliest :)
Classify each aqueous solution as acidic, basic, or neutral at 25 °C.
pH = 3.69
[OH-] = 3.7 x 10-10
pH = 9.04
[H+] = 6.1 x 103
[H] = 8.0 x 10-10
[OH-] = 7.1 x 10²
pH = 7.00
[H+] = 1.0 x 10-7
How is Earth different from other planets?
OA. It has liquid water.
OB. It has mountains.
OC. It has a moon.
OD. It gets light from the Sun
25cc of 5 % naoh solution neutralized 30cc of h2so4 solution. what is the normality of h2so4?
What is the normality of H₂SO₄?
The normality of H₂SO₄ that was neutralized with 25 cc of NaOH is 1.1 N.
Molarity of 5% NaOH:
The molar mass of NaOH = 40.00
(Through density tables).
value of 5% NaOH solution density = 1.0554 g/mL.
∴ 10 × 5 × 1.0554/40.00 = 1.32 M.
Thus, Molarity of 5% NaOH = 1.32 M.
30 cc of H₂SO₄ the solution was neutralized with 25 cc of NaOH.
Reaction:
2 NaOH + H₂SO₄ → [tex]Na_{2}SO_{4}[/tex] + 2[tex]H_{2}O[/tex]
Molarity of H₂SO₄ = 1.32 × 1 × 25/(30×2) = 0.55 M.
Normality = Molarity × moles of H⁺ ions per mole of H₂SO₄
moles of H⁺ ions per mole of H₂SO₄ = 2
Normality of H₂SO₄ = 0.5 × 2 = 1.1 N.
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The percent yield of alum is calculated based on the starting quantity of aluminum. Why can't the quantity of sulfuric acid be used to calculate the percent yield
The quantity of sulfuric acid may not be used because sulfuric acid is excessive and aluminum is limiting.
Limiting reactantsLimiting reactants in reactions are reactants that are present in lower stoichiometric quantities in comparison with other reactants.
Thus, limited reactants determine how far the reaction can go in terms of producing products.
Thus, the percent yield of alum might have been calculated based on the starting quantity of aluminum because the latter is the limiting reactant of the reaction.
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What would be the mass in grams of 0.300 moles of the ionic compound formed when magnesium metal reacts with oxygen
Answer:
Balanced Equation for reaction between Magnesium and Oxygen:
2Mg + O₂ --> 2MgO
Molar Mass of MgO is the atomic masses listed on the periodic table for the two elements Magnesium and Oxygen. Magnesium's molar mass is 24g/mol, and Oxygen's molar mass is 16g/mol. So MgO's molar mass would be 24 + 16 = 40g/mol.
The equation to find moles is:
[tex]moles \ = \ \frac{mass}{molar \ mass}[/tex]
So if we rearrange this equation to find for mass:
[tex]mass = moles \ * \ molar \ mass[/tex]
So you have to multiply 0.300 moles by 40, which gives you 12g
Meaning the mass of Magnesium Oxide is 12g.
Predict the products of the reaction below. That is, complete the right hand side of the chemical equation. Be sure your equation is balanced.
Answer:
2 HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + 2 H₂O
Explanation:
This is a double-displacement reaction. In these reactions, the cation of one molecule swaps with the cation of another.
In this case, the hydrogen cation (H⁺) from HClO₃ swaps with the calcium cation (Ca²⁺) of Ca(OH)₂. When writing the products, keep the charges of the ions in mind. The products must be neutral, so some will need to have more than 1 cation/anion.
The unbalanced equation:
HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + H₂O
Reactants: 3 hydrogen, 1 chlorine, 5 oxygen, 1 calcium
Products: 2 hydrogen, 2 chlorine, 7 oxygen, 1 calcium
The balanced equation:
2 HClO₃ + Ca(OH)₂ ---> Ca(ClO₃)₂ + 2 H₂O
Reactants: 4 hydrogen, 2 chlorine, 8 oxygen, 1 calcium
Products: 4 hydrogen, 2 chlorine, 8 oxygen, 1 calcium
An aqueous solution contains 0.21 M ammonium iodide. One Liter of this solution could be converted into a buffer by the addition of: (Assume that the volume remains constant as each substance is added.)
The ammonium iodide solution is converted into a buffer by the addition of ammonia (NH₃).
What is a buffer solution?A solution which is formed by the addition of weak acid and its conjugate base or weak base and its conjugate acid. They resist a change in pH of the solution when an acid or alkali added to them.Which is to be added to the given solution to convert it into a buffer?The given solution contains 0.21 M ammonium iodide (NH₄I). This is a salt of a weak base(NH₃) and a strong acid(HI).
NH₄I(s) → NH₃(g) + HI(g)
Where the salt is ionic. So, in aqueous solution it dissociates into NH₄⁺ and I⁻
The ammonium ion NH₄⁺ is the conjugate acid of the weak base NH₃.
So, the mixture of this weak base NH₃ and its conjugate acid NH₄⁺ converts the solution into a buffer.
Therefore, one liter of the given solution could be converted into a buffer by the addition of a weak base NH₃.
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2. Which of the following shows the correct, balanced equation for the reaction shown below?
CH4+0₂H₂O + CO₂
O CH, + O, → CHO
O CH4 +20₂ → 2 H₂O + CO₂ OCH, + O2 → H2O +CO,
OCH4 +0₂ → CH₂0
The balanced equation is [tex]\text{CH}_{4}+2\text{O}_{2} \longrightarrow \text{CO}_{2}+2\text{H}_{2}\text{O}[/tex].
The correct balanced chemical equation is CH₄ + 2 O₂[tex]\rightarrow[/tex] CO₂ + 2 H₂O.
What is chemical equation?Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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State law of conservation of mass and prove the law for below given chemical reaction
The law of conservation of mass say that, in a chemical reaction, the mass of the reagents will always be equal to the mass of the products. This is shown in the reaction given below.
Mass of the reagent: 100 g.Mass of the products: 56 + 44 = 100 g.Answer:
The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.
Explanation:
During a chemical reaction, atoms are neither created nor destroyed. The atoms of the reactants are just rearranged to form products. Hence, there is no change in m
2- chloro,2,3- dihydroxy-3,4-dimethyl pentane structure of the organic compound
Answer:
As denoted by the prefix, pent-, the parent chain should have 5 carbons. The numbers specify one which carbon in the parent chain (the pentane) the branch should be on. For instance, the chlorine branch should be on the second carbon.
Remember,
Chloro = Cl
Hydroxy = OH
Methyl = CH₃ (represented by a straight line)
vanillin is a flavoring agent in vanilla it has a mass percent composition of 61.15% c,5.3%H,31.55% o determine the empirical formula and molecular formula if molecular mass of vanillin is 152.15%g/mol
The empirical and molecular formulas will be [tex]C_5H_5O_2[/tex] and [tex]C_1_0H_1_0O_4[/tex] respectively.
Empirical and molecular formulaThe compound contains C, H, and O.
C = 61.15/12 = 5.0958
H = 5.3/1 = 5.3
O = 31.55/16 = 1.9719
Divide by the smallest
C = 2.6
H = 2.7
O = 1
Thus, the empirical formula is [tex]C_5H_5O_2[/tex]
Empirical formula mass = (12x5) + (1x5) + 16x2 = 97
n = 152.15/97 = 2
The molecular formula is [tex]C_1_0H_1_0O_4[/tex]
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If a calculation calls for you to convert from an amount of one substance in a given chemical reaction to the corresponding amount of another substance participating in the same reaction, it is an
The question is incomplete. Please read below to find the missing content.
By way of searching the coefficients, you may see that for each 1 mole of C6H12O6, 2 moles of CO2 are produced. Using this ratio, you can figure out what number of moles of carbon dioxide are crafted from five moles of glucose.
Stoichiometry permits us to make predictions about the outcomes of chemical reactions. Making beneficial predictions is one of the important dreams of science, the other being the ability to provide an explanation for phenomena we have a look at inside the natural world.
Stoichiometry can be tough as it builds upon a number of character capabilities. To be successful you need to grasp the abilities and learn how to devise your hassle-solving method. Master every one of those skills earlier than moving on, Calculating Molar Mass.
If a calculation calls for you to convert from an amount of one substance in a given chemical reaction to the corresponding amount of another substance participating in the same reaction, it is an equation Stoichiometry problem.
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Decide whether the property measured was a chemical or physical property of X, if you can. If you don’t have enough information to decide, choose can’t decide in the third column
Answer:
See attachment for explanations.
Explanation:
A sealed container holds ideal oxygen molecules (O2) at a temperature of 255 K. If the pressure is increased by 44.0%, what is the average translational kinetic energy of an oxygen molecule
The average kinetic energy of an oxygen molecule is K.E(avg) = 6.11×10^(-21) J.
According to the kinetic theory of gases, the average kinetic energy of a gas molecule is linearly proportional to the temperature of the gas. It is independent of the pressure of the gas.
The kinetic theory of gases is an easy, historically great classical version of the thermodynamic conduct of gases, with which many essential standards of thermodynamics had been established.
The model, referred to as the kinetic concept of gases, assumes that the molecules are very small relative to the gap among molecules. The molecules are in constant, random motion and frequently collide with every different and with the walls of any field.
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Describe a simple experiment that's can be performed in the lab to demonstrate the formation of irone(iii) chloride from iron filling
The inorganic chemical having the formula [tex]FeCl_3[/tex] is "Iron(III) chloride"
It is a common compound of iron in the +3 oxidation state and is also known as ferric chloride. The crystalline solid anhydrous chemical has a melting point of 307.6 °C. The color changes depending on the viewing angle; crystals that reflect light seem dark green, while those that transmit light appear purple-red.
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III. Look at Figure which shows solutions taken in test tubes A, B, C and D. What colour is expected when a piece of red litmus paper is dropped in each test tube? Nature of the solutions is given in the table for your help.
Neutral ----> No Change
Basic ----> Colour will change to
blue
Acidic ----> No change
Neutral ----> No change
hope this will the right answer &
Please attach a photo of the table next time.
☆...hope this helps...☆
_♡_mashi_♡_