C
Tarnishing of silver is caused by hydrogen sulfide and other sulfur containing compounds in the air reacting to the silver and resulting in a fine layer of silver sulfide. The other answers don't make sense
Q) Briefly describe how body systems work all together
Answer:
Your bones and muscles work together to support and move your body. Your respiratory system takes in oxygen from the air. ... Your circulatory system carries oxygen, water, and nutrients to cells throughout your body. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin.
Explanation:
Why is NH3 not considered a base under the Arrhenius definition of acids and bases?
SELECT AN ANSWER
a. It does not react with acids.
b. NH3(aq) does not contain OH- ions.
c. NH3 is considered a base under the Arrhenius definition, but not under the Bronsted-Lowry definition.
d. It does not cause a color change when mixed with an acid-base (pH) indicator.
Answer:
b. NH3(aq) does not contain OH- ions.
Explanation:
According to Arrhenius in his definition, a base is a substance that has the ability to increase the hydroxyll ion (OH-) of an aqueous solution. In other words, Arrhenius bases dissociates into OH- when dissolved in water.
According to this question, ammonia (NH3) will not be considered an Arrhenius base because it does not contain OH-. This means that ammonia (NH3) cannot dissociate into hydroxyll ion when dissolved in water.
If carbon is in an animal is it:
A. Abiotic matter
B. Biotic matter
C. Energy storage molecules
D. Carbon dioxide
I WILL MARK BRAINLIEST IF YOU HELP!
Do not guess or give me a file or I will report you!!
Answer:
It is A
Explanation:
Abiotic matter
An orgo lab student named Bob wanted to synthesize an isoamyl acetate ester because it smells like bananas and he really likes to sniff it. He heated 7.50 grams of isoamyl alcohol (3-methyl-1-butanol) with 22.5 grams of acetic acid (ethanoic acid) and 4.50 grams of sulfuric acidto prepare his favorite ester. Based on these numbers, how many grams of isoamyl acetateshould he theoretically obtain
Answer:
The answer is "11.07 g".
Explanation:
Isoamyl alcohol is a reagent restriction
Isoamyl alcohol Moles:
[tex]= \frac{7.5}{88.15} \\\\ =0.085[/tex]
Moles only with the shape of isoamyl acetate are equivalent to numbers.
Isoamyl acetate grams:
[tex]= 0.085 \times 130.19\\\\ = 11.07 \ g[/tex]
Does all of the liquid water in the atmosphere fall as rain? Why or why not?
Consider the balanced chemical equation
4B(s) + 302 (g)► 2B203(s)
What mole ratio would you use to calculate how many moles of oxygen gas would be needed to react completely with a given number of moles of boron?
A. 3 mol O2
/ 4 mol B
B. 4 mol O2/
3 mol B
C. 3 mol O2/
2 mol B
D.
2 mol O2
/ 3 mol B
Answer:
A
Explanation:
The coefficents are used when determining mole ratio. So just look in front of O and B
the ratio is 3/4
you cna use this in stoich as well
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of . The cylinder is also submerged in a large insulated water bath. (See sketch at right.) From previous experiments, this chemical reaction is known to release of energy. The position of the piston is monitored, and it is determined from this data that the system does of work on the piston during the reaction.
Answer:
It is exothermic in nature.
Explanation:
(1) The reaction is exothermic in nature because it releases heat energy.
(2) Yes, the temperature of the water go up as the reaction releases heat energy and the temperature cool down as the heat energy is completely removed from the water.
(3) The piston move in when the pressure in the cylinder decreases and the piston move out when increase of pressure occur.
(4) As the outside movement of piston occurs, so we can say that the gas mixture does work on its surroundings.
(5) The system released 244 kJ of energy, in which only 150 kJ went into the water, then the difference must be the work done by the system on its surroundings.
W = (244 - 150) kJ = 94 kJ
Pls help ASAP ! Identify the following reaction: H2 + O2 → H2O
Group of answer choices
synthesis reaction
decomposition reaction
single replacement reaction
double replacement reaction
Answer:
Synthesis Reaction
Explanation:
Here we see H2 and O2 are being combined H2O. Synthesis reactions are where we see a combination to make a single product.
So here it'd be A + B =AB
2Na(s)+Cl2(g)→2NaCl(s)
Decomposition would be the break down of a compound into 2, the opposite of synthesis.
AB = A + B
2HgO(s)→2Hg(l)+O2(g)
Single replacement is where 1 element replaces another in a reaction, or switches place with 1 element.
AY + B = A + BY
2 HCl(aq) + Zn(s) → ZnCl2(aq) + H2(g)
Double replacement is similar but 2 elements are switch/replaced.
AY + BX = AX + BY
CuCl2(aq) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 AgCl(s)
Part A. Classify each of these soluble solutes as a strong electrolyte, a weak electrolyte, or a nonelectrolyte. Solutes Formula Nitric acid HNO3 Potassium hydroxide KOH Formic acid HCOOH Ethyl amine CH3CH2NH2 Sodium bromide NaBr Butanol C4H9OH Sucrose C12H22O11
Part B. Enter a molecular equation for the reaction that occurs between aqueous HBr and aqueous LiOH.
Answer:
1. Strong electrolytes = Nitric acid HNO3,Potassium hydroxide KOH, Sodium bromide NaBr
Weak electrolytes = Formic acid HCOOH Ethyl amine CH3CH2NH2, Butanol C4H9OH
Non-electrolyte = Sucrose C12H22O11
2. The reaction between aqueous HBr and aqueous LiOH is shown innthe equation below:
HBr + LiOH ----> NaBr + H₂O
Explanation:
Electrolytes are substances that when in molten state or in aqueous solution dissociate into ions both positively-charged and negatively-charged ions known as actions and anions, which are then able conduct electricity.
Strong electrolytes are aqueous or molten solutions of compounds which ionize completely to produce anions and actions. Ionic compounds such as organic salts, acids and bases are strong electrolytes.
Weak electrolytes only ionize partially, that is, they produce few ions. Some organic salts, acids and bases are weak elctrolytes
From the compounds given above;
Strong electrolytes = Nitric acid HNO3,Potassium hydroxide KOH, Sodium bromide NaBr
Weak electrolytes = Formic acid HCOOH Ethyl amine CH3CH2NH2, Butanol C4H9OH
Non-electrolyte = Sucrose C12H22O11
2. The reaction between aqueous HBr and aqueous LiOH is shown innthe equation below:
HBr + LiOH ----> NaBr + H₂O
For each of the following, predict the complete, balanced chemical equation for the reaction that occurs when they are mixed. Make sure to label the states.
1. HNO3 & NaOH
2. Sr(OH)2 & HI
..
Answer:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reactions, it is necessary to keep in mind the cations and anions are switched around as a result of the bonds rearrangement in these neutralization reactions; therefore, we can proceed as follows:
1. The balanced chemical reaction is:
[tex]HNO_3(aq)+NaOH(aq)\rightarrow NaNO_3(aq)+H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
2. The balanced chemical reaction is:
[tex]2HI(aq)+Sr(OH)_2(aq)\rightarrow SrI_2(aq)+2H_2O(l)[/tex]
Because all atoms are in the same amount at each side of the equation and the resulting salt is soluble.
Best regards!
a sample of gas has a volume of 100.0L at 135C assuming the pressure remains constant
Answer: 84.56 L is the answer.
Explanation:
Answer:
84.6
Explanation:
I took the test
Section I: Experimental Overview
Provide background information.
Include the hypothesis(es).
Summarize the procedures.
Section II: Data and Observations
Summarize the data you collected in the lab guide.
Include information from data tables.
Include any written observations that are relevant.
Section III: Analysis and Discussion
Discuss any important calculations or formulas used.
Identify key results, what the results indicate, and any trends in the data.
Include graphs (if constructed) that display trends in the data.
Provide possible reasons for any problems with the experiment, or unexpected data.
Section IV: Conclusions
Identify if the hypothesis(es) was (were) supported or refuted.
Provide logical reasoning based on data.
Explain how the experiment could be improved.
To help you write your lab report, you will first answer the questions listed below by reflecting on the experiment you have just completed. Then you will use the answers to these questions to write the lab report that you will turn into your teacher.
You can upload your completed report with the upload tool in formats such as , Microsoft Word, or PDF. Alternatively, your teacher may ask you to turn in a paper copy of your report or use a web-based writing tool.
Questions
Section I: Experimental Overview
What is the purpose of the lab, the importance of the topic, and the question you are trying to answer?
What is your hypothesis (or hypotheses) for this experiment?
What methods are you using to test this (or each) hypothesis?
Section II: Data and Observations
Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings?
Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report?
Section III: Analysis and Discussion
What do the key results indicate?
If you constructed graphs, what trends do they indicate in your data?
Answer:
If you constructed graphs, what trends do they indicate in your data?
Can somebody please help me!!
Answer:
acceleration
pls dont report me
By which method the following mixture can be separated?(i)mixture of colours (ii) Minerals oil.
Answer:
mixture of colours answer
A study was created to test the effects of fear in children. The hypothesis of the experimenters was that if babies were exposed to fuzzy bunnies and at the same time a loud cymbal was struck close behind them, then that child would be afraid of all fuzzy things. Another group of children would be exposed to bunnies without any loud noises. The study was carried out as planned and as a result, hundreds of young children developed fear of all cute furry bunny rabbits.
Dependent Variable: ______________________
Control Group: ____________________________
Independent Variable: _____________________
Experimental Group: _______________________
Answer:
Dependent variable: the children's fear of rabbits
Control: the group that was NOT exposed to loud noises
Independent variable: the loud noises
Experimental Group: the group that was exposed to loud noises
what is your experience about water pollution
Answer:
water pollution is a process in which water gets polluted due to discharge of city sewage and industrial waste. I was suffering through the water born disease when I drank the contaminated water. The sources of water becomes dirty. It makes environment unbalanced. People suffer from different water born disease when they drink polluted water.
Click on an olive tree and read about it. Based on what you read, do you think the climate of Barcelona is very wet or rather dry? Explain.
Answer:
In the Autumn, Spring, and Winter, It is wet. In the Summer it is dry.
Explanation:
Can somebody please help me!!!!
Answer:
Friston to energy
Explanation:
Friction to Energy as its a energy stooping the object form moving
The isomerization reaction, ch3nc → ch3cn, is first order and the rate constant is equal to 0.46 s-1 at 600 k. what is the concentration of ch3nc after 7.0 seconds if the initial concentration is 0.30 m?
Answer:
y=meme3squared
Explanation:
YEEEEEEEEEEEEEEEE
why does oxygen and carbon dioxide travel within the seed and the egg
please answer's these scientist answer's
A scientist observes that the leg bones of cats are similar to the bones in the wings of bats. The scientist concludes the two species share a common ancestor. Which describes why the scientist drew that conclusion?
1. developmental patterns
2. DNA
3. fossil evidence
4 .structural data
Bald eagles might lay up to five eggs at a time, but only one hatchling usually survives. Which feature of natural selection is this an example of?
1 .adaptation
2. genetic variation
3. overproduction
4. selection
Which example is a mixture? alcohol water mercury orange soda
Answer:
water is an example of mixture
Organelles that use energy from sunlight to produce food are called mitochondria
O True
O False
Answer:
Organelles that use energy from sunlight to produce food are called mitochondria.
False
Convert 467.00 g AlCl3 to mol AlCl3.
Answer:
467.000g AICI3 to mol AICI3
Explanation
Answer:
7.49959 mol i hope this is right
need help i only have 5 more minutes left
Answer:
Bleach, seawater, blood, water, coffee, orange, lemon
Explanation:
The pH is a measurement in chemistry defined as the -log [H⁺]. pH is used in quality control of materials. The pH is a scale from 1 (Acids) to 14 (Bases). The pH of 7 is for neutral solutions
Based on the information of the image, the most basic is bleach, then the seawater, the blood, water (Neutral), coffee, orange and, the most acidic is lemon.
The order is:
Bleach, seawater, blood, water, coffee, orange, lemonWhat is the pressure, in mmHg, of a 4.00 g sample of O2 gas, which has a temperature of 37.0 °C, and a volume of 4400 mL?
Answer:
549.48 mmHg
Explanation:
We'll begin by calculating the number of mole of oxygen in 4 g. This can be obtained as follow:
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mass of O₂ = 4 g
Mole of O₂ =?
Mole = mass /molar mass
Mole of O₂ = 4/32
Mole of O₂ = 0.125 mole
Next, we shall convert 37.0 °C to Kelvin temperature. This can be obtained as follow:
T(K) = T(°C) + 273
T (°C) = 37.0 °C
T(K) = 37.0 °C + 273
T(K) = 310 K
Next, we shall convert 4400 mL to L.
1000 mL = 1 L
Therefore,
4400 mL = 4400 mL × 1 L / 1000 mL
4400 mL = 4.4 L
Next, we shall determine the pressure. This can be obtained as follow:
Number of mole (n) = 0.125 mole
Temperature (T) = 310 K
Volume (V) = 4.4 L
Gas constant (R) = 0.0821 atm.L/Kmol
Pressure (P) =?
PV = nRT
P × 4.4 = 0.125 × 0.0821 × 310
Divide both side by 4.4
P = (0.125 × 0.0821 × 310) / 4.4
P = 0.723 atm
Finally, we shall convert 0.723 atm to mmHg.
1 atm = 760 mmHg
Therefore,
0.723 atm = 0.723 atm × 760 mmHg / 1 atm
0.723 atm = 549.48 mmHg
Thus, the pressure is 549.48 mmHg
If 175.6 joules of energy are applied to a sample of Aluminum and its temperature changed by 35.4 degrees then what was the weight of the Aluminum sample?
Answer:
5.51g
Explanation:
Using the following formula:
Q = m × c × ∆T
Where;
Q = amount of heat in Joules
m = mass/weight of Aluminum
c = specific heat of Aluminum (0.900 J/g°C)
∆T = change in temperature.
Based on the information given in this question, Q = 175.6 joules, ∆T = 35.4°C, c = 0.900 J/g°C.
Using, Q = m × c × ∆T
175.6 = m × 0.900 × 35.4
175.6 = 31.86m
m = 175.6/31.86
m = 5.51g
The weight of the aluminum sample is 5.51g.
what is the xonclusion of separating acetone and water by simple and fractional distillation
Answer:
In conclusion, acetone was determined to be the unknown used in the simple distillation and acetone- water was separated successfully by fractional distillation. Introduction Distillation is the chief technique used to separate and purify liquids.
what changes would you see in the colour of litmus paper in lemon,ash and blood
Answer:
Colour of litmus papers in lemon:
Blue litmus- Red
Red litmus- No change
Really sorry but don't know about others
Litmus paper indicator shows following color changes for lemon it is, blue litmus to red, for ash and blood it is red litmus to blue indicating their acidic nature in case of lemon and alkaline nature in case of ash and blood.
What is an indicator?Indicator is defined as a chemical substance which is chemically a weak acid or a weak base which changes it's color depending upon the concentration of hydrogen ions present in the solution.They dissociate slightly in water to produce ions.
These are generally derived from plant pigments and are of slightly acidic or basic in nature.There are three types of indicators:
1) natural indicators
2) synthetic indicators
3) olfactory indicators.
These are mainly used in determination of end point of titrations. Every indicator has it's pH range in which it can perform effectively.These are usually organic compounds.
Learn more about indicators,here:
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Which has greater heat capacity—iron, tin, or bismuth? Why do you say this?
Answer:
Bismuth, because when three cubes of the same mass were heated and dropped into the same temperature water, the water the bismuth cube was dropped in heated up much less than the water with iron or tin.
REWRITE THIS IN YOUR OWN WORDS PLEASE, THANK YOU.
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The greatest heat capacity is possessed by iron.
The heat capacity of materials increases as the number of particles in the material or density of the material increases.
This means that the denser a material is, the higher its heat capacity because it has more particles that absorbs heat.
The heat capacity is the quantity of heat required to raise the temperature of 1 gram of a material by 1°C.
The heat capacities of iron, tin and bismuth are: 0.45 J/g °C, 0.213 J/g °C and 0.123 J/g °C.
This follows from the decreasing densities of the metals in the order; iron > tin > bismuth.
Hence iron has the greatest heat capacity among the three elements.
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