Answer:
176 degrees Fahrenheit
Explanation:
please mark me as brainiest and follow
Bacteria make their own food through photosynthesis making them autotrophs. * True or False
Answer: true
Explanation:
true
Name the compound of calcium used for disinfecting water. Give its chemical formula.
Answer: the compound used in disinfecting water is called Bleaching powder. It's chemical formula is CaOCl2 ( calcium oxychloride).
Explanation:
Water is a universal solvent. It is polar in nature and dissolves most inorganic solutes and some polar organic solutes to form aqueous solutions. Rain, springs, well, rivers, lakes and sea are natural sources of water.
Most natural water contains dissolved mineral salts, suspended impurities and germs. Therefore to make it safe for domestic and industrial use, water from natural resources undergoes in water treatment tanks:
--> coagulation,
--> sedimentation,
--> filtration and
--> disinfection.
Taking a quick glance at the whole process z water is first collected in large tanks and filtered to remove large particles. Chemical like CA(OH)2 is added to coagulate the fine particles. The coagulated particles are removed by using filter beds. Then the Bleaching powder (calcium oxychloride) is added to kill the bacteria ( disinfection). Then water is ready for use.
Given that a 3cm lenght of magnesium weights approximately 0.04g, calculate the number of moles of acid that reacted with the 9cm piece of magnesium ribbon.
A chemical reaction happens in three steps.
Step 1: A→B+C (fast)
Step 2: C→D+E (slow)
Step 3:D+A→F (fast)
What is the rate-determining step?
Steps 1 and 3
Steps 1 and 2
Steps 2 and 3
Step 3 only
Step 1 only
Step 2 only
Is the formation of CO2(g) from its elements endothermic or exothermic?
Exothermic because the ΔH is negative.
Endothermic because the ΔH is negative.
Endothermic because the ΔH is positive.
Exothermic because the ΔH is positive.
Answer: Exothermic because the ΔH is negative.
Explanation:
The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.
[tex]C(s)+O_2(g)\rightarrow CO_2(g)[/tex]
Exothermic reactions are those reactions in which heat is released and [tex]\Delta H[/tex] is negative.Endothermic reactions are those reactions in which heat is absorbed and [tex]\Delta H[/tex] is positive.
The reaction is exothermic as the heat is released during the formation of [tex]CO_2[/tex] as heat of formation of [tex]CO_2[/tex] is negative.
DESPERATE!!!!! What is the molar mass of an unknown gas that has a density of 2.29 g/L at a pressure of 0.75 atm and a temperature of 88. degrees Celsius?
Answer:
The molar mass of the gas is 90.4g/mol
Explanation:
To solve this question we have to use the equation:
d = PM / RT
Where d is density of the gas = 2.29g/L
P is pressure = 0.75atm
M is molar mass of the gas = ??
R is gas constant = 0.082atmL/molK
T is absolute temperature = 88°C + 273.15 = 361.15K
Solving for M:
dRT / P = M
2.29L*0.082atmL/molK*361.15K / 0.75atm = M
90.4g/mol = M
The molar mass of the gas is 90.4g/mol
In a metal crystal, describe the difference between “core electrons” and “valence electrons”
Answer:
Valence electrons occupy the outermost shell or highest energy level of an atom while core electrons are those occupying the innermost shell or lowest energy levels. This difference greatly influences the role of the two types of electrons in a chemical reaction.
How many minutes are theretin 24 hours? (60 min = 1 hr)
Answer:
1440 Minutes
Explanation:
60 x 24
You have 4 containers, labeled A, B, C, and D, filled with clear and colorless solutions. Explain how you can determine (no tasting allowed) the contents of the beakers. The possibilities are distilled water, 1 M C12H22O11 solution, 1M NaCl solution, 1M HCl solution, and 1M NaOH solution.
Answer:
Using blue and red litmus paper.
Explanation:
if we test all the solutions with blue and red litmus paper, we will know which solution is water and which solution is not water because blue and red litmus paper determined the pH of the solution. The pH of the water is neutral so it can't change its colour while on the other hand, the other solution change their colour due to acidic or basic nature of the solution so in this way we can determine the chemicals in the solution without tasting it.
Study the reaction.
NH4+ + NO2– ⟶ N2 + 2H2O
The rate of this reaction is proportional to the concentration of ammonium (NH4+) and the concentration of nitrogen dioxide (NO2–).
What is the rate law of this reaction?
Rate = K[N2][H2O]2
Rate = K[NH4+]2
Rate = K[NH4+][NO2–]
Rate = K[NO2–]2
Answer:
Rate = K[NH4+][NO2–]
Explanation:
Hello there!
In this case, since rate laws include the concentration of the species contributing to the rate of a chemical reaction; this question asserts this reaction is proportional to the concentration of ammonium (NH4+) and the concentration of nitrogen dioxide (NO2–); therefore, the rate law must contain the concentration of both reactants, for that reason, the answer would be Rate = K[NH4+][NO2–] as it contains the concentration of the aforementioned species.
Regards!
How do emulsifiers help oil and water to mix and not separate?
Answer:
To prevent the mixture from separating substances called emulsifiers can be added. These help to form and stabilise the emulsions, preventing or slowing the water and fat/oil from separating. ... The hydrophilic end of the emulsifier molecule is attracted to the water and the hydrophobic end is attracted to the fat/oil.
whats another name for body cells (not sex cells) that are produced by mitosis?
Answer: Diploid Cells (?)
Explanation:
HELP PLEASEEE!!!!
When 60 grams of an alloy, at 20 C is dropped into water, the alloy
absorbs 2000 Joules of heat. If the final temperature of the alloy is 35 C, what is its specific heat? show your work.
What is the volume, in liters, of 0.250 moles of carbon monoxide at STP?
WRITE THE FORMULAS FOR THE COMPOUNDS, NOT JUST THE NAMES. INCLUDE UNITS!
A bag of Flavored Snacks contains 120 Calories per serving. How many Joules (J) are in one serving?
Answer:
502.08 J
Explanation:
1 cal is equal to 4.184 J so we simply do 120*4.184 to find the joules
Describe a method to investigate how the temperature changes when different masses of ammonium nitrate are dissolved in water
Answer:
Endothermic and Exothermic Reactions
Endothermic and Exothermic ReactionsIn this experiment you are investigating whether dissolving ammonium nitrate in water is an endothermic or exothermic reaction. An endothermic reaction absorbs energy from its surroundings (heat), so the reaction gets colder.
Explanation:
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Which of the chemicals in the following chemical reaction is the base?
CH3OH + HF --> CH3COH2+ + F-
A.)CH3COH2+
B.)F-
C.)HF
D.)CH3OH
D) CH3OH
Base is chemical which have hydroxide ion. so CH3OH is base
How many grams of Fe2O3 are formed when 51.3 grams of iron, Fe, react completely with oxygen, O2? 4 Fe + 3 O2 --> 2 Fe2O3
The Fe is our limiting reactant here. First, convert the mass of Fe given to moles of Fe by dividing mass by the molar mass:
(51.3 g Fe)/(55.845 g/mol) = 0.9186 mol Fe.
According to the balanced equation, 2 moles of Fe2O3 are produced for every 4 moles of Fe that are consumed. In other words, half as many moles of Fe2O3 will be produced as there are Fe that react:
(0.9186 mol Fe)(2 mol Fe2O3/4 mol Fe) = 0.4593 mol Fe2O3.
Finally, convert the moles of Fe2O3 back to grams by multiplying by the molar mass of Fe2O3:
(0.4593 mol Fe2O3)(159.6882 g/mol) = 73.3 g Fe2O3.
So, 73.3 grams of Fe2O3 are formed.
U will be marked as Brainliest if u solve ex 1 only
Answer:
You can look at the charge of the molecule.
mg has a +1 charge so the oxidation numbrr for Mg = +1.
For Fe2O3 the total charge is 0. This means the charges of the Fe and the O needs to be equal. O has an oxidation number of -2. You got O3 so 3 x -2 = -6. You got Fe2 so -6 / 2 = -3. Oxidation number of O = -2 and for Fe = -3.
The if you go to the rightbof the reaction you got 3 MgO. O had an oxidation number of -2. The total charge of the molecule is 0 zero, so Mg should be +2.
Mg on the left of the equation has a oxidation number of +1, and on the right +2. The number changed, so it's a redox reaction.
Which of the following processes provides the water necessary for human A.consumption?
B.perspiration
C.evaporation
D.precipitation
E.sublimation
Answer:
c
Explanation:
I want to say c cause u got to evaporate water that is deity so u can drink it. but I might be worng
Answer:
b
Explanation:
precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzling, rain, sleet, snow, ice pellets, graupel and hail.
how long will it take you to get to class 300 meters away if you go 0.5 m/s?
Answer:
600 seconds, or 10 minutes
Explanation:
300m/ 0.5m = 600s
Nuclear equation problem
Please answer asap no explanation needed
(Look at picture)
Answer:
answer is will be C) ok alright
Which of the following is the standard temperature?
O None of these are correct
O All of these are correct
O 98.6 degrees fahrenheit
O 310 kelvin
O 37 degrees celcius
Answer:
i think its c but im sorry if im wrong
Explanation:
True or False: Stoichiometry includes using ratios from balanced chemical equations to determine the amounts of reactants used or products made in a reaction.
Answer:
True
Explanation:
Stoichiometry is simply the ability to make predictions about any chemical reaction. Now, to make a correct prediction of the outcome of a chemical reaction, the equation definitely has to be balanced because for example mass, in every chemical equation, mass is conversed.
Please help ASAP.....please
would you choose to buy a soft drink in a plastic bottle or an aluminium can? Explain your answer.(3 marks)
Answer:
In a bottle.
Explanation:
I would like soda in a bottle because you don't get soda stuck in the aluminum can like you do a bottle. And it's also way more efficient because bottles have caps that you can screw on later, but aluminum doesn't.
The amount of heat energy needed to heat 200 g of water from 15 °C to its boiling point, and boil it, is
can you explain it further
If 95 grams of Iron are needed to react with sulfur, how many grams of sulfur are involved in this reaction?
2 Fe + 3 S à Fe2S3
Answer:
You need a balanced equation.
2Fe(s) + 3S(s) ==> Fe2S3(s) ... balanced equation
Reactants are solid iron and solid sulfur
Product is iron(III) sulfide
A. 1.42 moles Fe x 3 moles S/2 moles Fe = 2.13 moles sulfur
B. 2.75 moles S x 2 moles Fe/3 moles S = 1.83 moles iron
125 mL of a stock HCl solution was diluted to make 300 mL of a 0.750 mol/L HCl solution. What was the concentration of the original stock solution?
Answer: c= 1.8 mol/l
Explanation: amount of substance remains same.
Amount of substance n = c1·V1 = c2·V2 and c1= c2·V2/ V1
Original concentration c1= 300 ml·0.750 mol/l / 125 ml
Can someone pls help me?
Answer:
A) day and night
Explanation:
please mark brainliest, i need it for a new rank<33
Answer:
You answer is A
Explanation:
Without the earth rotating on its axis, we wouldn't have day or night because we will be stuck facing the sun or the moon forever.
What is the method of harvesting trees where mature trees are left intact that
provide shelter to younger seedling trees called ?? It's for a crossword puzzle and the answer should be two words and together there should be 19 letters