Answer:
it becomes poisonous to the body
What solution usually goes in burette? 1) Acid 2) Base 3) Indicators 4) Water
Answer: the acid
Explanation:
Balance the following chemical equation
Answer:
Explanation:
4). Ca(NO₃)₂ + Na₂SO₄ → CaSO₄ + 2Na(NO₃)₂
This question is incorrect.
Since, the final product by reacting Na⁺⁺ and NO₃⁻⁻ is NaNO₃
Correct equation will be,
Ca(NO₃)₂ + Na₂SO₄ → CaSO₄ + 2NaNO₃
This equation is in the balanced form.
5). Ni(NO₃)₂ + KI → NiI + 2K(NO₃)₂
Correct equation will be,
Ni(NO₃)₂ + KI → NiI₂ + 2KNO₃
[Since final product by reacting Ni⁺⁺ and I⁻ is NiI₂]
Balanced form of this equation will be,
Ni(NO₃)₂ + 2KI → NiI₂ + 2KNO₃
6). Ni(NO₃)₂ + KOH → NiOH + K(NO₃)₂
Correct form of the equation will be
Ni(NO₃)₂ + KOH → Ni(OH)₂ + KNO₃
[Since reaction of Ni⁺⁺ and OH⁻ gives Ni(OH)₂ and the reaction of K⁺ and NO₃⁻ gives KNO₃]
Now balancing this equation,
Ni(NO₃)₂ + KOH → Ni(OH)₂ + 2KNO₃
↓
Ni(NO₃)₂ + 2KOH → Ni(OH)₂ + 2KNO₃
Modern atomic theory states that atoms are neutral. How is this neutrality achieved? (3 points) Select one: a. Equal number of neutrons and protons b. Equal number of protons and electrons c. More electrons than protons d. More neutrons than electrons
Answer:
The answer is option B.
Equal number of protons and electronsHope this helps you
Answer:
equal number of electrons and protons
Explanation:
electron is negatively charged and proton is positively charged for an atom to stay neutrality # of electrons and protons must be equal.
is a process that involves the collection of information and ideas supported by evidence.
Science
Systematics
Pseudoscience
Hypothesis
Answer:
pseudoscience
Explanation:
srry that this is so late btw, hope this helps...
Answer:
Science
Explanation:
First response is NOT correct
Describe how u would separate a mixture of salt , sand and iodine into different components. please help i will give a brainliest for this . PLEASE HELP?
to remove iodine sublime
to remove sand filter
to remove water evaporate
Explanation:
1. put the mixture in a beaker
2.Heat the mixture using a watch glass filled with cold water, the iodine will sublime at the base of the watch glass.
3.Add water to sand and salt. Stir for salt to diffuse in the water
4.Filter sand from the solution using a filter paper
5.evaporate the remaining water to remain with Salt crystals.
The proof that ch4 is a weak acid
Answer: because ch4 is not considered a acid they said it is too weak
Explanation:
someone help PLSSSS. i’ve asked this question like 3 times already Determine the number of lone pair electrons on each H in NH3. Z of N= 7, H=1 A. 0 B. 3 C. 1 D. 2
Answer:
The answer is option B.
3.
Hope this helps you
An element of Group Il loses two electrons in the process of a chemical combination. What is its ionic charge?
A. +2
B. -2
Answer:
A. +2
Explanation:
When neutral atom loses electrons, number protons(+) becomes more than number of electrons(-), so charge of ion is positive.
Which refers specifically to a heated solution that holds more dissolved solution than it can hold at a lower temperature? supersaturated undersaturated heterogeneous homogeneous
Answer:
A. Supersaturated
Explanation:
i got it right on edge 2021
The heated solution that holds more dissolved solution than it can hold at a lower temperature is supersaturated solution. Therefore, option A is correct.
What is supersaturated solution ?A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. By introducing a tiny solute crystal known as a seed crystal, the excess dissolved solvent in a super-saturated solution can begin to recrystallize.
A solution that contains more solvent than the typical amount that can dissolve at a specific temperature is said to be supersaturated. A solution is considered supersaturated if it contains more solute than is necessary to saturate it.
A solution that contains more solute than it can hold at a specific temperature is said to be supersaturated. Usually, raising a solution's temperature causes more particles to dissolve, increasing the solute concentration.
Thus, option A is correct.
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Why is water so important for life?Why cant other substance made of hydrogen and oxygen like hydrogen peroxide take its place?
Answer:
Reasons water is important
Imagine earth without water. The soil, with no water in it and nothing growing on it, would be lifeless, dead, collapsed into dust, sand, clay or rock.
-Water consumption helps lubricate and cushion your joints, spinal cord, and tissues. This will help you enjoy physical activity and lessen discomfort caused by conditions like arthritis.
-Water is a main component of saliva. Saliva also includes small amounts of electrolytes, mucus, and enzymes. It’s essential for breaking down solid food and keeping your mouth healthy.
what’s the answer ?????
option A is the correct one
It represents Mp orBp of a substance at a specific pressure
How to calculate this ?
Do you use the molar mass and multiply it by the mass given ?
Answer:
Option C. 8.91g
Explanation:
The balanced equation for the reaction is given below:
2Pb(NO3)2 —> 2PbO + 4NO2 + O2
Next, we shall determine the mass of Pb(NO3)2 that decomposed and the mass PbO produced from the balanced equation.
This is illustrated below below:
Molar mass of Pb(NO3)2 = 207 + 2[14 + (16x3)]
= 207 + 2[14 + 48]
= 207 + 2[62] = 207 + 124
= 331g/mol
Mass of Pb(NO3)2 from the balanced equation = 2 x 331 = 662g
Molar mass of PbO = 207 + 16 = 223g/mol
Mass of PbO from the balanced equation = 2 x 223 = 446g
Summary:
From the balanced equation above,
662g of Pb(NO3)2 decomposed to produce 446g of PbO.
Finally, we can obtain the maximum mass of lead(II) oxide, PbO produced from 13.23g of lead (II) nitrate, Pb(NO3)2 as follow:
From the balanced equation above,
662g of Pb(NO3)2 decomposed to produce 446g of PbO.
Therefore, 13.23g of Pb(NO3)2 will decompose to produce = (13.23 x 446)/662 = 8.91g of PbO.
Therefore, 8.91g of PbO were obtained from the decomposition of 13.23g of Pb(NO3)2
Monica has $20. She needs to buy a gallon of milk that costs $2.50. She also wants to buy yogurt, which costs $1.20 a cup. What is the greatest number of cups of yogurt Monica can buy? Use the inequality 1.20x + 2.5 ≤ 20 to solve the problem
news coverage and tend to _ drug use?
a)discourage B)glamorize
C)glamorize
Answer:
glamorize
Explanation:
There are many stories about celebrities being on drugs, and the media seems to deliver the stories in a way that acts as drugs are beneficial and further glamorizes them.
News coverage tends to glamorize drug use.
How does social media influence pills?An examination performed by the national middle on addiction and Substance Abuse at Columbia college discovered that young adults who frequently use popular social media outlets have been more likely to drink, use pills, and buy tobacco than adolescents who both did no longer use social media or used it less regularly.
Does media insurance have an effect on the spread of drug addiction?The effects display that the media impact on the human populace cannot exchange the stabilities of equilibria however can affect the number of drug addicts. Sensitivity analyses are performed to search for powerful control measures for drug treatment.
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Sulphuric acid, also called ‘king of chemicals' has the formula H2SO4. Its appearance is different from that of hydrogen and sulphur. Give two other reasons why sulphuric acid is a compound and not a mixture.
Explanation:
Before proceeding to answering the question, we have t understand what we mean by both mixture and compound.
A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.
A compound on the other hand is a chemical substance composed of many identical molecules composed of atoms from more than one element held together by chemical bonds.
The two other reason why H2SO4 is a compound and not a mixture are;
1) The components which are Hydrogen, Sulphur and Oxygen cannot be separated by physical means.
2) It has a constant melting and boiling point.
Given the information below, which is more favorable energetically, the oxidation of succinate to fumarate by NAD+ or by FAD? Fumarate + 2H+ + 2e- → Succinate E°´ = 0.031 V NAD+ + 2H+ + 2e- → NADH + H+ E°´ = -0.320 FAD + 2H+ + 2e- → FADH2 E°´ = -0.219
Answer:
Oxidation with FAD is more favorable energetically.
Explanation:
With FAD as the electron acceptor;
∆E'° = (E'° from reduction reaction) – (E'° from oxidation reaction)
∆E'° = (-0.219) - 0.031 = -0.25 V
The standard free energy change, ∆G'° = -nF∆E'° ; where n is number of moles of electrons = 2, F is Faraday's constant = 96.5 KJ/V.mol
∆G'° = -2 × 96.5 KJ/V.mol × (-0.25)
∆G'° = 48.25 KJ/mol
With NAD+ as electron acceptor
∆E'° = (E'° from reduction reaction) – (E'° from oxidation reaction)
∆E'° = (-0.320) - 0.031 = -0.351 V
The standard free energy change, ∆G'° = -nF∆E'° ; n = 2, F = 96.5 KJ/V.mol
∆G'° = -2 × 96.5 KJ/V.mol × (-0.351)
∆G'° = 67.74 KJ/mol
From the above values obtained, the oxidation by FAD is more favorable energetically as the free energy is less positive than with NAD+
How much energy does a 185 nm wave of light have? (The speed of light in a
vacuum is 3.00 x 108 m/s, and Planck's constant is 6.626 x 10-34 Jos.)
A. 1.07 x 10-18 J
B. 8.38 x 1034j
C. 9.31 x 1017 J
D. 3.68 x 10-32 J
O
Answer: A. 1.07 x 10∧ -18 J
Explanation:
The energy can be calculated by using this relation; E = hc / ∧
Where E = energy
h = Planck's constant = 6.626 x 10-34joules
c = speed of light = 3.00 x 10∧8 m/s
∧ = wavelenght = 185 nm = 185 x 10∧ -9m
Therefore; E= hc / ∧
= (6.626 x 10-34 j/s) x ( 3.00 x 10∧8 m/s) / 185 x 10∧ -9m
= 1.987 x 10 ∧ -25 / 185 x 10∧ -9m
= 1.07 x 10∧ -18 J
Which group will have a charge of +2 when ionized?
O A. Alkali Earth metals
OB. Halogens
C. Alkali metals
D. Noble gases
Answer:
Alkaline earth metals
Explanation:
Group 2 has 2 valence electrons that they lose when being ionized, thus making their charge 2+.
Answer:
alkali earth metals
Explanation:
ed tell chem
When a sample of Mg is combusted in a bomb calorimeter, 25.4 kJ of energy as heat is evolved. The calorimeter contains 7.50 x 102 g of water at an initial temperature of 18.6 °C. The specific heat capacity of water is 4.184 J/gLaTeX: \cdot⋅°C and the heat capacity of the bomb is 8.20 x 102 J/°C. Calculate the final temperature of the water and the bomb
Answer:
x = 25.02 or 25°c
Explanation:
Given:
mass of water : 7.50×10² =750 gm
Ccal = 8.20× 10² = 820 J/°c
Let assume final temp = x°c
then, heat gained by the water + heat gained by calorimeter
= 25400 J
⇒ Mw × Cw× ΔTw+ Ccal ×ΔT = 25400
⇒ 750× 4.184 × (x - 18.6) + 820 ×(x-18.6) = 25400
⇒ x = 25.02 or 25°c
How do mass and type of material affect thermal energy transfer?
Answer:
Temperature, mass, and the type of material are factors that affect the thermal energy of an object.
Material with the higher specific heat will have more thermal energy than material with lower specific heat if they both have the same mass and temperature.
The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.
If two materials have the same mass and temperature, the material with the greater specific heat will have more thermal energy than the material with the lower specific heat.
How does thermal energy transfer depend on the kind of material?
The speed at which thermal energy moves from one end of a substance to another determines thermal conductivity. Insulators transport thermal energy slowly while conductors transfer thermal energy quickly.
The thermal energy within the thing increases if the temperature remains constant but the object's mass rises.
Conduction, convection, or radiation are all ways that thermal energy can be moved from one location to another.
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How does an enzyme’s active site relate to its substrate?
Answer:
The enzyme's active site must be the mold shape of the substrate.
Explanation:
An enzyme and a substrate bind together in order to work. If the shapes of the 2 are different, they will not be able to bond together. If the shapes of the 2 fit glove-in-hand, then they will be able to bond together.
What was the purpose of the periodic table?
A. To organize elements as they were discovered
O B. To list the chemical reactions an element can have
O C. To name elements as they were discovered
O D. To identify all the isotopes of each element
SUBMIT
Answer:
A
Explanation:
The purpose of the periodic table was to organize elements as they were discovered into periods and groups, according to their properties. It was not just a naming of elements, as a list.
The purpose of the periodic table was to organize elements as they were discovered. Thus option A is correct.
What is periodic table?Periodic table is defined as an arrangement of all known elements in order of increasing atomic number and recurrent chemical attributes.
It can also be defined as a tabular arrangement of chemical elements ordered by increasing atomic number and element groups.
It helps us to learn about an ordered grouping of the 118 known chemical elements.
The periodic table contains alkali metal, alkaline earth metal, transition elements, noble gas, post transition element etc. and many more elements are arranged in periodic table in groups.
Thus, the purpose of the periodic table was to organize elements as they were discovered. Thus option A is correct.
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what's love like? what feels are involved?
Select the most dilute solution a.A solution made by dissolving 60g of sodium hydroxide in 2000cm cubed b.A solution made by dissolving 40 g of sodium hydroxide in 1000 cm cubed of solution. c.A solution made by dissolving 10 g of sodium hydroxide in 250 cm cubed of solution. d.A solution made by dissolving 20 g of sodium hydroxide in 500 cm3 of solution.
Answer:
A, a solution made by dissolving 60g of sodium hydroxide in 2000cm³
Explanation:
Concentration = no. of moles / volume (in dm³)
1 dm³ = 1000cm³
no. of moles = mass / molar mass
molar mass of NaOH = 23.0+16.0+1.0 = 40 g/mol
Let's find the concentration of each of the solutions:
A:
= 60/40 /2
= 0.75 mol/dm³
B:
= 40/40 /1
= 1 mol/dm³
C:
= 10/40 / 0.25
=1 mol/dm³
D:
= 20/40 / 0.5
= 1 mol/dm³
Since 0.75mol/dm³ is the lowest concentration out of 4, it is the most dilute.
A drug problem can quickly consume A)a small portions of a person income B)the bulk of a person income C)a person excess income
Answer:
b
Explanation:
a drug problem consumes the bulk of a persons income because drugs are expensive to buy
A drug problem can quickly consume the bulk of a person income
What is a drug problem?A drug is any chemical substance that causes a change in an organism's physiology or psychology when consumed. Drug abuse or substance abuse refers to the use of certain chemicals for the purpose of creating pleasurable effects on the brain.
Drug use can have significant and damaging short-term and long-term effects. Taking some drugs can be particularly risky, especially if you take high doses or combine them with other drugs or alcohol.
People of any age, sex or economic status can become addicted to a drug. Certain factors can affect the likelihood and speed of developing an addiction.
The best way to prevent an addiction to a drug is not to take the drug at all. If your doctor prescribes a drug with the potential for addiction, use care when taking the drug and follow the instructions provided by your doctor. Thus you can save your income.
The correct answer is option B.
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What is the activation energy for the reaction in this energy diagram?
Answer:
+ 100 Kj
Explanation:
The very minimum energy required to activate atoms or molecules to undergo chemical transformation.
Answer:
It is 60kj.
Explanation:
It is the highest point minus where a+b is at, so it is 60kj.
When 12 g of methanol (CH3OH) was treated with excess oxidizing agent (MnO4-), 14 g of formic acid (HCOOH) was obtained. Using the following chemical equation, calculate the percent yield. (The reaction is much more complex than this; please ignore the fact that the charges do not balance.)
3CH3OH + 4MnO4- ----> 3HCOOH + 4MnO2
(a) 100%
(b) 92%
(c) 82%
(d) 70%
(e) 55%
Answer:
(c) 82%
Explanation:
Using the chemical reaction:
3CH₃OH + 4MnO₄⁻ → 3HCOOH + 4MnO₂ + 4e⁻
3 moles of methanol produce 3 moles of formic acid (Reaction 1:1)
To find the percent yield we need to calculate theoretical yield of the reaction when 12g of methanol (Molar mass: 32.04g/mol) are reacting, thus:
12g ₓ (1mol / 32.04g) = 0.3745 moles of methanol are in 12g.
As 1 mole of methanol produce 1 mole of formic acid, assuming a 100% of yield in the reaction (Theoretical yield) moles produced of formic acid are 0.3745 moles.
Using molar mass of formic acid (46.03g/mol), mass of the acid in 0.3745moles are:
0.3745 moles ₓ (46.03g/mol) = 17.2g of formic acid are theoretical yield
Percent yield is calculated as:
(actual yield / Theoretical yield) × 100
As actual yield of the reaction is 14g. Theoretical yield is:
(14g / 17.2g) × 100 = 81.2% ≈ 82%
Right answer is:
(c) 82%The percentage yield of the reaction is 82%
The correct answer to the question is Option C. 82%
We'll begin by writing the balanced equation for the reaction.
3CH₃OH + 4MnO₄⁻ → 3HCOOH + 4MnO₂ + 4e⁻
Molar mass of CH₃OH = 12 + (3×1) + 16 + 1 = 32 g/mol
Mass of CH₃OH from the balanced equation = 3 × 32 = 96 g
Molar mass of HCOOH = 1 + 12 + 16 + 16 + 1 = 46 g/mol
Mass of HCOOH from the balanced equation = 3 × 46 = 138 g
From the balanced equation above,
96 g of CH₃OH reacted to produce 138 g of HCOOH
Next, we shall determine the theoretical yield of HCOOH.From the balanced equation above,
96 g of CH₃OH reacted to produce 138 g of HCOOH.
Therefore,
12 g of CH₃OH will react to produce = (12 × 138)/96 ≈ 17g of HCOOH.
Finally, we shall determine the percentage yield.Actual yield of HCOOH = 14 g
Theoretical yield of HCOOH = 17 g
Percentage yield =?Percentage yield = Actual / Theoretical × 100
Percentage yield = 14/17 × 100
Percentage yield ≈ 82%The correct answer to the question is Option C. 82%
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Which will change will cause the gravitational force between a baseball and a soccerball
How much water should be added to 12 ml of alcohol to obtain 12% alcohol solution?
Answer:
88 mL of water.
Explanation:
Data obtained from the question include the following:
Volume of alcohol = 12 mL
Percentage of alcohol = 12%
Volume of water =..?
We can thus, obtain the volume of water needed to make 12% of the alcohol solution as follow:
Percentage of the solution = 100%
Percentage of alcohol = 12%
Percentage of water =?
Percentage of water = percentage of solution – percentage of alcohol
Percentage of water = 100 – 12
Percentage of water = 88%
Since 12% of alcohol is equivalent to 12 mL of alcohol, therefore 88% of water will also be equivalent to 88 mL.
Therefore, 88 mL of water is needed to make 12% of alcohol.
Which of the following is a characteristic property of the halogen? A. They are very reactive B. They are very stable C. They are metals D. They are all gases
Answer:A
Explanation:
They are very reactive is a characteristic property of halogen.
Hence, Option (A) is correct answer.
What is Halogen ?Halogens are non metallic elements in periodic table. It belongs to group 17 in the periodic table. Halogen family consists six elements that is Fluorine (F), Chlorine (Cl), Bromine (Br), Iodine (I), Astatine (At) and Tennessine (Ts).
What are the characteristics property of halogen ?They are nonmetals. Halogens have 7 valence electrons. They are highly reactive with alkaline earth metal and alkali metals. Halogens are not stable.Thus, from the above conclusion we can say that They are very reactive is a characteristic property of halogen.
Hence, Option (A) is correct answer.
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