The Cabbage Indicator
Your hypothesis about how to indicate various levels of pH, both acid and base with an indicator:
What liquids were used in the investigation?
Vinegar is an acid. Which liquids produced colors like vinegar?
Baking soda is a base. Which liquids produced colors like baking soda?
Did you see any that did not fit into either color group? If so which one(s)?
Could you determine the relative pH of the liquids by the varying color of the cabbage indicator?
Do you think you could add drops of a base solution into an acid solution until they indicate neutral?
How would you be able to tell when a neutral pH was obtained?
What did you find out from this investigation? Be thoughtful in your answer.
.A solution that serves as a pH indicator may be made using red cabbage, which is frequently available in homes. In essence, the color of the cabbage depends on the acidity of the solution and a pigment molecule called flavin or anthocyanin.
To determine whether a material is an acid or a base, red cabbage indicator is a purple-colored solution
Vinegar is an acid and its pH value is less than 7 and hence
Red color is produced
Baking soda is base and its pH value is greater than 7 and between 8-9
and the color produced is sky blue
Bleach is the green which is also a basic and because the pH value is 10-11
Householder cleaner is having pH 11-13 which is basic and hence the yellow is the color of household cleaner .
A basic solution goes away from being basic and toward the center of the pH scale when an acid is introduced. The base is "neutralized" in this manner.
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In photosynthesis, plants use energy from the sun to produce glucose, c6h12o6 , and oxygen from the reaction of carbon dioxide and water.
6co2 + 6h2o --> c6h12o6 + 6o2
what mass, in grams, of glucose is produced when 3.00 mol of water react with carbon dioxide?
Answer: 324 g (to 3 sf)
Explanation:
Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.
The atomic mass of carbon is 12.011 g/mol.The atomic mass of oxygen is 15.9994 g/mol.Thus, the formula mass of carbon dioxide is:
[tex]6(15.9994)+12.011=108.0074[/tex] g/mol.
Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)
the law of definite proportions was first stated by
a. lavoisier
b. galileo
c. proust
d. dalton
Answer:
C.proust
Explanation:
Proust's law of definite proportions.
The law of definite proportions was first put forward by the French chemist Joseph Louis Proust in 1779. The discovery that mass was always conserved in chemical reactions was soon followed by the law of definite proportions, which states that a given chemical compound always contains the same elements in the same proportions by mass.
The law of constant proportions is often referred to as Proust’s law of definite proportions.For example, in a nitrogen dioxide (NO2 ) molecule, the ratio of the number of nitrogen and oxygen atoms is 1:2, but the mass ratio is 14:32 (or 7:16).For example, pure water will always contain hydrogen and oxygen in a fixed mass ratio (a gram of water consists of approximately 0.11 grams of hydrogen and 0.88 grams of oxygen, the ratio is 1:8).━━━━━━━━━━━━━━━━━━━━━
10 uses of metals in daily life
Answer:For jewellery and ornaments, gold, platinum and silver are being used.
For building purposes, iron and steel can be used.Iron and aluminium are used as utensils.
The thermometer uses mercury and helps to monitor the temperature.
The insulation wires are made of aluminium.
Aluminium foils are being used as wrappers for food.In sweets, a silver foil is being used.
To avoid rusting, zinc is used for galvanizing.In vehicles, iron is being used.
For making cable wires, copper is being used.
Explanation:
Answer:
1. For jewellery and ornaments, gold, platinum and silver are being used.
2. For building purposes, iron and steel can be used.
3. Iron and aluminium are used as utensils.
4. The thermometer uses mercury and helps to monitor the temperature.
5. The insulation wires are made of aluminium.
6. Aluminium foils are being used as wrappers for food.
7. In sweets, a silver foil is being used.
8. To avoid rusting, zinc is used for galvanizing.
9. In vehicles, iron is being used.
10. For making cable wires, copper is being used.
An electrolytic cell differs from a voltaic cell because.
What is produced during the replacement reaction of ba(no3)2 and na2so4? 2bana 2no3so4 2nano3 baso4 nano3 baso4 bana2 (no3)2so4
2NaNO3(aq) + BaSO4 = Ba(NO3)2(aq) + Na2SO4(aq) (s)
Procedures involved:
The cations or anions may transfer positions in this twofold replacement/displacement reaction, which results in AB + CD AD + CB. In such a reaction, water, an insoluble gas, or an insoluble solid must be one of the byproducts (precipitate). The reaction in question has the following molecular equation:
2NaNO3(aq) + BaSO4 = Ba(NO3)2(aq) + Na2SO4(aq) (s)
Double displacement:
When two atoms or groups of atoms swap positions, a double displacement reaction occurs, creating new compounds. Typically, aqueous solutions are where it happens.
Na2SO4 + BaCl2 BaSO4 + 2NaCl is an example of a double displacement reaction.
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An ice cube absorbs 353 cal of
energy from its surroundings.
How many joules of energy is
this?
Answer:
1482.6 J
Explanation:
353 cal * 4.2 J / 1 cal = 1482.6 J
An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.
What is Energy?The ability to do work is called as energy. Work done is product of force and displacement. Energy is of different types as sound energy, kinetic energy, potential energy, electrical energy, light energy etc.
Law of conservation of energy states that energy can neither be created nor destroyed, but it can be transferred from one form to another.
Molecules can move so they show kinetic energy, molecules can be there at many positions so they can show potential energy, molecules can vibrate so they can show sound energy but molecules can only absorb light hence they can't have light energy.
1 calorie of energy has 4.2 Joules.
Given, 353 Calories of Energy
Hence, 353 Calories of Energy has 1482.6 Joules.
Therefore, An ice cube absorbs 353 cal of energy from its surroundings. Number of joules of energy is 1482.6 Joules.
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What is the common uses of bases
Given the balanced equation representing a
reaction:
2H₂ + O₂ → 2H₂O + energy
4. Which mass of oxygen completely reacts with
4.0 grams of hydrogen to produce 36.0 grams of
water?
(1) 8.0 g
(2) 16.0 g
(3) 32.0 g
(4) 40.0 g
Answer: it would be number 3, 32.0g
Which feature of a balanced chemical equation demonstrates the law of conservation of mass?
Answer:
A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
The bright-line emission spectrum of an element can best be explained by.
The light emitted by an element when its electrons return to a lower energy state can be viewed as a bright line emission spectrum.
What is Emission spectrum ?The distribution of electromagnetic radiation released by a substance whose atoms have been excited by heat or radiation.
A spectroscope can be used to determine which frequencies have been emitted by a substance.
An emission line will appear in a spectrum if the source emits specific wavelengths of radiation.
This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy.
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Whose view that matter is infinitely divisible was considered correct for most of the last two millennia?.
Aristotle and Democritus (to some extent) view that matter is infinitely divisible was considered correct for most of the last two millennia
What is Matter ?Anything that occupies space and have some mass is known as matter.
Aristotle believed that everything was comprised of earth, air, water, and fire, which were infinitely divisible.
Democritus stated that matter was subdivided into indivisible and immutable particles that created the appearance of change when they joined and separated from others.
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What are the environmental impacts of chemical industries using distillation to separate chemical solutions?
Answer:
The production process often produces offensive odours and may also create by-products that can contaminate air and ground water. Many industrial separation processes have requirements and consequences that influence where they are located.
Explanation:
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What is the mass of the object on this triple beam balance?
A closer look at the triple beam balance shows that mass of the body is 52.5 g.
What is a triple beam balance?The term triple beam balance refers to an equipment that is used to determine the mass of an object. It has three different degrees of calibration as shown.
In this case, if we look at the beam balance well, we can see that the mass of the body is 52.5 g.
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2. The table below shows the atomic numbers of elements of the periodic table represented by letters I to Q The letters are not the actual chemical symbols for the elements. Element J Atomic number www I 且 } T H 3 Lithiur K 7 Witrogen 8 Select two elements which belong ta Olygin The same period of the periodic table Jk The same group of the period table. Select the element which: twitt form a divalent andon Reacts murst vigorously with water. 9 N Home 10 (Ink (1mk bºr (Ink 12 May Nashy 13 Aluminian C 14 St Veer
Explanation:
cudhdbsieehe eirbruwnee8ebeuw eodjsuww8
A 609 ml sample of naoh has a ph of 13.5292. if 594 ml of distilled water was added to the initial naoh solution, what would the new ph of the solution be g
The new pH of the solution after the addition of water would be 13.22.
Total volume of the solutionV(total) = 609 ml + 594 ml
V(total) = 1203 ml
Concentration of waterC = (594 ml)/(1203 ml)
C = 0.493
pOH = -log(0.493)
pOH = 0.31
New pH of the solution = 13.5292 - 0.31 = 13.22
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What is the volume in L of a 0.825 mole sample of Ar at 600 mm Hg and 300 K? Report your answer to the nearest tenth of a L. (Moodle is looking for a number only, no units.)
The volume is 2.608L
Given the value of n is 0.825 mole , pressure is 600mm = 0.789bar and Temperature = 300K
We need to calculate the volume in L
As we know the values of number of moles , pressure and Temperature is given
So , to calculate the volume we will use the ideal gas law
The equation of state for a fictitious perfect gas is known as the ideal gas law, sometimes known as the generic gas equation. Although it has several restrictions, it is a decent approximation of the behavior of numerous gases under various circumstances.
Ideal gas law formula
PV = nRT
0.789*V = 0.825*8.3143*300
V = 0.825*8.314*300/0.789
V = 2.608*10^3
V = 2.608 L
Hence the Volume is 2.608 L
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Oxygen forms a number of compounds with sulfur, many of which are quite reactive. One such compound is 57.20 % by mass S . Calculate the number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S . g O
The number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S = 29.9g of oxygen
Calculation of quantity of OxygenThe compound contains the following:
sulphur = 57.20%
Oxygen= 100 - 57.20 = 42.80%
If 57.20% of the sample contains 40g of sulphur then 42.80% of the sample will contain X.
Make X the subject of formula,
X = 42.8 × 40/57.20
X= 1712/57.20
X= 29.9g of oxygen
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The integrating center for the negative feedback loop that regulates body temperature is the.
Answer: Hypothalamus
Explanation:
The hypothalamus controls body temperature by sending signals to muscles, organs, glands, and other components of the nervous system when it becomes too low or too high. These structures then help in returning the body temperature to normal.
A car manufacturer needs to assemble the maximum number of cars using the following equation: 1 body frame + 4 wheels + 2 headlights + 2 brakes + 1 engine It has 48 body frames, 64 headlights, 80 wheels, 60 brakes and 30 engines. What is the limiting reactant in this case?
The wheels will be completely used up and it is the limiting reactant in this case.
What is a limiting reactant?The limiting reactant is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
60 breaks will be used for 30 engines and 30 body frame80 wheels will be used for 20 engines and 20 body frame64 headlights will be used for 32 engines and 32 body frameThe wheels will be completely used up and it is the limiting reactant in this case.
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If you added the same amount of sugar to the same amount of water and boiled it, what would the boiling point be?
Answer:
Adding sugar to water will raise the boiling point and decrease the freezing point of water.
Explanation:
Hope this helps!
If same amount of sugar added to the same amount of water and boiled it then boiling point increases.
When sugar added to water it become solution.
Example: If water boils at 100°C then solution with 80% sugar in 20% of water boils at 112°C.
Why boiling point of solution of sugar and water is higher then boiling point of water?Since, sugar is non-volatile solute. So, when we boil the solution of sugar in water then water boils easily in low temperature but more high temperature is required to boil sugar.
What is non-volatile solute?The solute which has higher vapor pressure as compare to solution in which it dissolve is called non-volatile solute.
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what can we use to help us predict the results of reaction when we put metals into competition?
The activity series of metals as well as the electrode potential of metals can be used to compare the reactivity of metals.
What is used in comparing reactivity of metals?The reactivity of metals can be compared using their electrode potentials which is a measures of the ability of the metal to donate electrons to another metal.
When comparing the reactivity of metals, the metal with the lesser negative electrode potential will be more reactive than another with a greater negative or positive electrode potential.
Therefore, the activity series of metals as well as the electrode potential of metals can be used to compare the reactivity of metals.
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How many grams of Ag2S2O3 form
when 125.0 g AgBr reacts completely
according to the reaction below?
2AgBr + Na2S2O3 → Ag2S₂O3 + 2NaBr
Taking into account the reaction stoichiometry, 109.09 grams of Ag₂S₂O₃ are formed when 125 g AgBr reacts completely.
Reaction stoichiometryIn first place, the balanced reaction is:
2 AgBr + Na₂S₂O₃ → Ag₂S₂O₃ + 2 NaBr
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
AgBr: 2 moles Na₂S₂O₃: 1 moleAg₂S₂O₃: 1 mole NaBr: 2 molesThe molar mass of the compounds is:
AgBr: 187.77 g/moleNa₂S₂O₃: 158 g/moleAg₂S₂O₃: 327.74 g/moleNaBr: 102.9 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
AgBr: 2 moles ×187.77 g/mole= 375.54 gramsNa₂S₂O₃: 1 mole ×158 g/mole= 158 gramsAg₂S₂O₃: 1 mole ×327.74 g/mole= 327.74 gramsNaBr: 2 moles ×102.9 g/mole= 205.8 gramsMass of Ag₂S₂O₃ formedThe following rule of three can be applied: if by reaction stoichiometry 375.54 grams of AgBr form 327.74 grams of Ag₂S₂O₃, 125 grams of AgBr form how much mass of Ag₂S₂O₃?
[tex]mass of Ag_{2} S_{2} O_{3} =\frac{125 grams of AgBrx327.74 grams of Ag_{2} S_{2} O_{3}}{375.54 grams of AgBr}[/tex]
mass of Ag₂S₂O₃= 109.09 grams
Then, 109.09 grams of Ag₂S₂O₃ are formed when 125 g AgBr reacts completely.
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How many grams of butane were in 1. 000 atm of gas at room temperature?
The mass in grams of butane at standard room temperature is 53.21 grams.
How can we determine the mass of an organic substance at room temperature?The gram of an organic substance at room temperature can be determined by using the ideal gas equation which can be expressed as:
PV = nRT
1 × 22.4 L = n × (0.0821 atm*L/mol*K× 298 K)
n = 22.4/24.4658 moles
n = 0.91556 moles
Recall that:
number of moles = mass(in grams)/molar massmass of butane = 0.91556 moles × 58.12 g/mole
mass of butane = 53.21 grams
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A is a solution containing 3.5g of HX per dm-³. B is a solution containing 0.050moldm-³ of an hydrous sodium trioxocarbonate (IV) of solution 25cm³ portions of solution B required an average of 26.10cm³ of Solution A for complete neutralization. From this results, calculate
1. The Molar Concentration Of A
2. The Relative Molar Mass Of A
Equation For The Reaction 2HX + Na2CO3 ---> 2NaX + H2O + CO2
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The Molar Concentration Of A =0.099 .
The Relative Molar Mass Of A = 35.0129 gm
Given,
Mass of HX = 3.5 g
Moles of solution B ([tex]Na_{2} CO_{3}[/tex]) = 0.05 moles
Volume of HX = 26.10 mL
Volume of Solution B = 25 mL
Molecular weight of solution B = 2(atomic weight of Na )+ atomic weight of C + 3(atomic weight of O)
= 2(23) + 12 + 3(16)
=106 gm
Equivalent weight of [tex]Na_{2} CO_{3}[/tex] = molecular weight / 2 = 106 /2 =53 g
Mole = mass / molecular weight
∴0.05 = mass / 106
∴ mass = 5.3 gm [tex]Na_{2} CO_{3}[/tex]
Normality = mass ÷ (equivalent weight × volume of the solution in liter)
= 5.3 ÷( 53 × 0.025)
=4 N
So, by using formula ,
[tex]N_{1} V_{1} =N_{2} V_{2}[/tex]
[tex]N_{1}[/tex] = normality of solution B = 4 N
[tex]V_{1}[/tex] = volume of solution B = 25 mL
[tex]N_{2}[/tex] = normality of solution A = ? N
[tex]V_{2}[/tex] =Volume of solution A = 26.1 mL
∴ 4×25 = [tex]N_{2}[/tex] × 26.1
∴[tex]N_{2}[/tex] = 3.83 N
∴ normality of solution A = 3.83 N
from Formula of the normality we can find the equivalent weight of the A
Normality = mass of HX ÷ (equivalent weight × volume of the solution in liter)
3.83 = 3.5 ÷( equivalent weight × 0.0261)
∴equivalent weight = 35.0129 g
In case of HX the electron transfer is 1 ,so equivalent weight = molecular weight ; which is also termed as relative molar mass in given case.
∴The Relative Molar Mass Of A = 35.0129 g
Molar concentration = mass / molar mass
= 3.5 / 35.0129
= 0.099 mole
∴ The Molar Concentration of A is 0.099 .
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Question 6 of 10
What happens in a single-replacement reaction?
O A. Two reactants combine to form one product.
OB. One reactant replaces an element in another reactant.
OC. Two reactants exchange elements with each other.
D. One reactant breaks apart to form new compounds.
SUBMIT
Answer:D
Explanation:
A single-replacement reaction occurs when one element replace another in a single compound.
B. One reactant replaces an element in another reactant.
Explanation:Chemical reactions occur when reactants bond or break apart to form new substances known as the products.
Types of Reactions
There are a few main types of reactions:
SynthesisDecompositionSingle ReplacementDouble ReplacementAll of these are different ways chemical reactions can occur.
Synthesis
Synthesis occurs when two different reactants form one product. This would be a match for answer choice A.
An example includes: [tex]C+O_{2}[/tex] → [tex]CO_{2}[/tex]Decomposition
Decomposition occurs when one reactant breaks down, usually through heat, to form 2 different products, which matches answer choice D.
One example is: NaCl → Na + ClSingle Replacement
Single replacement occurs when there are 2 reactants, a substance and an element, and the singular elements replaces one of the elements in the substance to form new products. Since this matches answer choice B, this is the correct answer.
For example, K + NaCl → KCl + NaDouble Replacement
Finally, double replacement is when there are 2 reactants and each switches an element with the other. This is seen in answer choice C.
One example includes: [tex]3KNO_{3} +AlCl_{3}[/tex] → [tex]Al(NO_{3})_{3} +3KCl[/tex]For this example remember that [tex]NO_{3}[/tex] is a polyatomic ion and acts as a singular element.
What is the theoretical yield of NaBr
when 2.36 moles of FeBr3 reacts?
2FeBr3 + 3Na2S → Fе₂S3 + 6NaBr
[?] mol NaBr
Round your answer to the hundredths place
The theoretical yield of NaBr given that 2.36 moles of FeBr₃ reacts is 7.08 moles
Balanced equation2FeBr₃ + 3Na₂S → Fе₂S₃ + 6NaBr
From the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
How to determine the theoretical yield of NaBrFrom the balanced equation above,
2 moles FeBr₃ reacted to produce 6 moles of NaBr
Therefore,
2.36 moles FeBr₃ will react to produce = (2.36 × 6) / 2 = 7.08 moles of NaBr
Therefore,
Thus, the theoretical yield of NaBr is 7.08 moles
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Answer:
7.08
Explanation:
Which best describes two ways in which hydrogen is involved in photosynthesis?
O1-Hydrogen is stored in leaves of plants.
2-Hydrogen combines with carbon dioxide to make glucose.
O1-Hydrogen is stored in leaves of plants.
2- Hydrogen combines with oxygen to make water.
O 1-Hydrogen enters plants as a component of water.
2-Hydrogen combines with carbon dioxide to make glucose.
O1-Hydrogen enters plants as a component of water.
2- Hydrogen combines with oxygen to make carbon dioxide.
Answer:
1- Hydrogen enters plants as a component of water.
2-Hydrogen combines with carbon dioxide to make glucose.
Explanation:
Hydrogen enters the plant bonded with Oxygen as water (H2O).
The water molecule splits and the Hydrogen combines with carbon dioxide to make glucose.
Answer:
1 - Hydrogen enters plants as a component of water.
2 - Hydrogen combines with carbon dioxide to make glucose.
Explanation:
First twenty element with electronic configuration
Explain light as the condition required for chemical change with few examples.
