Answer:
Potassium
Explanation:
Most reactive metal in the reactivity series
The element in the question is referred to the alkali metal which is known as Potassium
Potassium is a highly reactive metal and reacts with Hydrochloric acid to
form a salt known as Potassium chloride and hydrogen gas.
Hcl + K ⇒ Kcl₍s₎ + H₂₍g₎
Potassium has a white color but when it reacts with water it explodes and
gives out a purple-red color as a result of the high excitation of electrons.
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Which substance cannot be separated or broken down into simpler substances by chemical means?
table salt
gold wire
candle wax
water vapor
Answer: Gold Wire
Explanation:
Out of all of these options only gold wire is an element, elements are pure and cannot be broken down by any chemical means
hope it helped, good luck :)
How many grams is 0.02 moles of CuCl2
Answer:
2.69g
Explanation:
The molar masses of
Cu = 63.5
Cl = 35.5
So the molar mass of [tex]CuCl_{2}[/tex] is 63.5 + (35.5 x 2) = 134.5
134.5 x 0.02 = 2.69g
The results of Huy’s eye exam show that he is nearsighted. Which explanation should Huy expect to hear?
“You need convex lenses to shorten the distance that light takes to focus in your eyes.”
“You need concave lenses to shorten the distance that light takes to focus in your eyes.”
“You need convex lenses to lengthen the distance that light takes to focus in your eyes.”
“You need concave lenses to lengthen the distance that light takes to focus in your eyes.” hurrrrrrrrrrry plz
Answer:
You need concave lenses to lengthen the distance that light takes to focus in your eyes.
Answer:
option D
Explanation:
“You need concave lenses to lengthen the distance that light takes to focus in your eyes.”
2023
What is the pH and pOH of a 2.2 x 10^-3 HBr solution?
Answer:
The pH and pOH of a 2.2*10⁻³ HBr solution is 2.66 and 11.34 respectively.
Explanation:
pH - short for hydrogen potential - is a measure of the acidity or alkalinity of a solution. So the pH is a parameter that indicates the concentration of hydrogen ions [H]⁺ that exist in a solution.
The pH is expressed as the negative base 10 logarithm of the hydrogen ion concentration. This is represented by:
pH= - log [H⁺]
pH is measured on a scale of 0 to 14. On this scale, a pH value of 7 is neutral, which means that the substance or solution is neither acidic nor alkaline. A pH value of less than 7 means that it is more acidic, and a pH value of more than 7 means that it is more alkaline.
HBr is a strong acid. Then, in aqueous solution it will be totally dissociated. So the proton concentration is equal to the initial concentration of acid:
[H⁺]= [HBr]= 2.2*10⁻³ M
So:
pH= - log (2.2*10⁻³)
pH= 2.66
On the other hand, pOH is a measure of the concentration of hydroxyl ions in a solution. The sum of pH and pOH equals 14:
pH + pOH= 14
2.66 + pOH= 14
pOH= 14 - 2.66
pOH= 11.34
The pH and pOH of a 2.2*10⁻³ HBr solution is 2.66 and 11.34 respectively.
Balancing chemical equation
_CoBr3 + _CaSO4 -> _CaBr2 + _Co2 (SO4)2
- solution please
Answer:
2 CoBr3 + 3 CaSO4 = 3 CaBr2 + Co2(SO4)2
Explanation:
why an indicator is a necessary part of the titration experiment?
Answer:
In a titration, you determine an unknown concentration of a sample by adding a second reactant of known concentration. In many titrations, you use a chemical called an indicator, which lets you know when the titration finishes.
Explanation:
How long does it take for the earth to rotate
A. 24hrs
B. 1 yr
C. 2 weeks
D. 5 months
Answer:
24 hrs it takes for the earth to rotate
What are three main ocean currents?
how many moles are 2.54×10^29 molecules of H20
Answer:
Explanation: The number of atoms is an exact number, the number of mole is an exact number; they do not affect the number of significant figures. The average mass of one mole of H2O is 18.02 grams. This is stated: the molar mass of water is 18.02 g/mol.
2.0 L of a gas is at STP. What is the new pressure in kPa if the volume changes to 10.5 L and the temperature and # of molecules remain constant?
Answer:
What is the new volume if the temperature is constant? V=2.50L. P = lookPa. P2=40k Pa. V2 = x. PV = P2 ... If a sample of gas occupies 6.8 L at 327°C
H2SO4 + 2NaOH → Na2SO4 + 2H2O what volume of water vapor will be produced if you start with 71.5 g of sulfuric acid and excess of sodium hydroxide
Answer:
Explanation:
Find the molar mass of H2SO4
2H = 2 * 1 = 2
S = 1 * 32 =32
O4 = 4*16 = 64
total 98
Find the number of mols in 71.5 grams
mols = given mass / molar mass.
given mass = 71.5
molar mass = 98
mols = 71.5/98
mols = 0.7296 mols of H2SO4
Find the moles of H2O
From the Balanced equation, every mol of H2SO4 produces 2 moles of H2O
mols water = 2 * 0.7296
mols water = 1.4592
That's as far as I can take you. I have to know a great deal more to get the volume of H2O
30g of Aluminum at 80°c is added to 30g of water at 10°c . Predict
the final temperature of the water
Answer:
the explanation of this 20
Explanation:
20 c
The increase in the rate of solvation with a rise in solvent temperature is mainly due to a(n)
a. increase in the activaton energy
b. increase in the movement of molecules leading to more collisions.
c. None of the above
Please help I need answer soon.
A volcanic mountain made up of volcanic ash, cinders, and bombs is called a ___________________.
Answer:
Cinder cone
Explanation:
Sooner or later your new school won't feel so strange.get.
I'm hoping the same for my new coaching classes
This is my first time going out to study ngl-
Will give brainliest!!!!
Answer:
Its B :)
Hope this helps
Image B will shows the butter particles before and after thermal energy will be transferred to the solid butter by heating. So, the correct option is B.
What is Thermal energy?The energy present in a system that determines its temperature is referred to as thermal energy. Thermal energy flows as heat. Thermodynamics is a whole field of physics that studies how heat is transmitted across various systems and how work is performed in the process.
The butter particles in Picture B are shown both before and after the solid butter has been heated to transmit thermal energy to it. This image shows a solid butter particle with tightly packed molecules, however when the butter is heated, it melts into a liquid form with loosely packed molecules.
Thus, the correct option is B.
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5 Facts about cell division
Answer:
Cell division is the process by which a cell, called the parent cell, divides into two cells, called daughter cells.[1] When the cell divides, everything inside it divides also. The nucleus and the chromosomes divide, and the mitochondria divide also.
In mitosis, an ordinary body (somatic) cell divides to make two daughter cells.
In meiosis, a cell divides twice, to produce four gametes (sex cells). The first division of meiosis is a special kind of cell division called a reduction division because the number of chromosomes is halved. The second division of meiosis is similar to mitosis.[2]
Three types of cell division: left is binary fission as in bacteria; right are mitosis and meiosis as in eukaryotes.
Cells are the 'building blocks' of life, and cell division is a basic feature of life. For simple unicellular organisms like Amoebozoa, one cell division reproduces the entire organism. On a larger scale, cell division can create offspring from multicellular organisms, such as plants that grow from cuttings. But most importantly, cell division enables organisms that are able to sexually reproduce to develop from the one-celled fertilised egg (zygote). Cell division also allows for continual renewal and repair of the organism.
The cell division is completed in the four phases prophase, metaphase, anaphase, and telophase.
What is cell division?It is the process by which cells divide into daughter cells. This keeps the cell organism to survive.
The five facts about cell division are:
The cell division has 4 phases.In prophase, the cell DNA condensed to form chromosomes.In metaphase, the chromosomes are aligned in the middle of the cell.In anaphase, the chromosomes move towards the different poles.In telophase cells divide into two daughter cells.Therefore, the cell division is completed in the four phases prophase, metaphase, anaphase, and telophase.
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Need help please!! To obtain pure lead, lead (II) sulfide is burned in an atmosphere of pure oxygen. The products of the reaction are lead and sulfur trioxide (SO3). Write a balanced chemical equation for this process. How many grams of lead will be produced if 2.54 grams of PbS is burned with 1.88 g of O2? Express your answer to the correct number of significant figures. Be sure to show all steps completed to arrive at the answer. (Hint: be sure to work the problem with both PbS and O2).
The equation of the reaction is [tex]2PbS + 3O_{2} --- > 2Pb + 2SO_{3}[/tex] and the mass of lead produced is 2.28 g
What is the equation?The term equation is the means by which we could be able to represent what is going on in the reaction system on a piece of paper. Thus, when we write a reaction equation, it is a representation of the process that is going on in the system. By the use of the stoichiometry of the reaction we could obtain the parameters of the equation.
The balanced reaction equation is; [tex]2PbS + 3O_{2} --- > 2Pb + 2SO_{3}[/tex].
Number of moles of lead (II) sulfide = 2.54 grams/239 g/mol = 0.011 moles
Number of moles of oxygen = 1.88 g/32 g/mol = 0.059 moles
If 2 moles of lead (II) sulfide reacts with 3 moles of oxygen
0.011 moles of lead (II) sulfide reacts with 0.011 moles * 3 moles /2 moles
= 0.0017 moles
Hence lead (II) sulfide is the limiting reactant.
If 2 moles of lead (II) sulfide produces 2 moles of lead
Mass of the Lead produced = 0.011 moles * 207 g/mol = 2.28 g
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b) If 35 grams of copper (II) chloride react with 20 grams of sodium nitrate, how much sodium chloride can be formed? what is the limiting reactant ? what is the excessive reactant ?
Answer:
CuCl₂ is the excessive reactant and NaNO₃ the limiting reactant, 13.7g of NaCl can be formed.
Explanation:
Based on the reaction:
CuCl₂ + 2NaNO₃ → 2NaCl + Cu(NO₃)₂
To solve the problem we must convert the mass of each reactant in order to find limiting reactant as follows:
Moles CuCl₂ -Molar mass: 134.45g/mol-:
35g * (1mol / 134.45g) = 0.26 moles
Moles NaNO₃ -Molar mass: 84.99g/mol-:
20g * (1mol / 84.99g) = 0.235 moles
For a complete reaction of 0.235 moles of NaNO₃ there are required:
0.235 moles NaNO₃ * (1 mol CuCl₂ / 2 mol NaNO₃) = 0.118 moles CuCl₂
As there are 0.26 moles CuCl₂,
CuCl₂ is the excessive reactant and NaNO₃ the limiting reactantAs 2 moles of NaNO₃ produce 2 moles of NaCl, he moles of NaCl produced are: 0.235 moles NaCl. The mass is:
Mass NaCl -Molar mass: 58.44g/mol-:
0.235 moles NaCl * (58.44g / mol) =
13.7g of NaCl can be formedhow do you think petals protect the internal structures of a plant?
Answer:
hmm that is a very tricky question. probably from over flooding with water
Please help help help help
Answer:
50000 dollars or 5 e5
Explanation:
Mr. Garibay has [tex]5.0 * 10^4[/tex] dollars in his bank.
Scientific notation represents the data in the format of expanded number or with e character.
For instance, 5.0 * 10^4 dollars = 50000 dollars or 5 e5
The pressure of a gas is 440. mm Hg. Express this in units of (a) atmospheres, (b) bars, and (c) pascals.
Answer: a) 0.579 atm
b) 0.585 bar
c) 58662 Pa
Explanation:
Pressure of the gas is defined as the force exerted by the particles on the walls of the container. It is expressed in various terms like 'mmHg', 'atm', 'kiloPascals' etc..
All these units of pressure are inter convertible.
We are given:
Pressure of the gas = 440 mmHg
a) Converting this unit of pressure into 'atm' by using conversion factor:
[tex]760mmHg=1atm[/tex]
[tex]440mmHg=\frac{1}{760}\times 440=0.579atm[/tex]
b) Converting this unit of pressure into 'bars' by using conversion factor:
[tex]760mmHg=1.01bar[/tex]
[tex]440mmHg=\frac{1.01}{760}\times 440=0.585bar[/tex]
c) Converting this unit of pressure into 'Pascal' by using conversion factor:
[tex]760mmHg=101325Pa[/tex]
[tex]440mmHg=\frac{101325}{760}\times 440=58662Pa[/tex]
Which part of the nervous system analyzes the information and initiates a response
Answer:
CNS (central nervous system)
Explanation:
The central nervous system is responsible for integrating sensory information and responding accordingly.
Neurons (specialized cells of the nervous system ) send signals along thin fibers called axons and communicate with other cells by releasing chemicals called neurotransmitters at cell-cell junctions called synapses.
Energy pyramid worksheet
Answer:
From top to bottom coyote, crow, squirrel, then acorn
Explanation:
The coyote has the least amount of energy and its the biggest predator so it belongs at the top. The crows eat squirrels and the squirrels eat acorns.
How do i design a controlled experiment to appropriately test a hypothesis?
Answer:
you need only one independent variable because if not, you wont know what factors have changed your experiment.
Explanation:
Both the appearance and cooking times of food items are affected by the way a piece of food is:
Select one:
a. examined.
b. tenderized.
c. purchased.
d. cut.
Answer:
D.
cut.
Explanation:
Both the appearance and cooking times of food items are affected by the way a piece of food is cut. Thus option D is correct.
what are the types of food ?
Food has an important role in both culture and cuisine of every country, Different types of food combine to form culinary delights which can bring people together
Food is obtained from both plants and animals where Plants are the primary producers in the food pyramid and all organism directly or indirectly obtain food from plants.
Herbivorous animals get their food from their plant ecosystem where Some animals, obtain food by hunting other animals while others depend on decaying matter of plants and animals which are called decomposers like bacteria, fungi.
Food offers variety forms depend upon climatic conditions and availability and depend on the different factors like Physical determinants ,Biological determinants, Economical determinants.
Thus option D is correct.
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What is the percentage by mass of sulphur in Al2(SO4)3[A12SO4 =
342g/mol, S = 32]
Answer: The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%
Explanation:
Mass percent of an element is the ratio of mass of that element by the total mass expressed in terms of percentage.
[tex]{\text {Mass percentage}}=\frac{\text {mass of sulphur}}{\text {Total mass}}\times 100\%[/tex]
Given: mass of sulphur = 32 g/mol
mass of [tex]Al_2(SO_4)_3[/tex] = 342 g/mol
Putting in the values we get:
[tex]{\text {Mass percentage}}=\frac{32g/mol}{342g/mol}\times 100\%=9.36\%[/tex]
The percentage by mass of sulphur in [tex]Al_2(SO_4)_3[/tex] is 9.36%
Define Transportation plants:
Define Respiration Plants:
Answer:
Define Transportation in plants: Transportation in plants is when the plant transports water and other mineral throughout the whole plant from the roots to the stem and finally specific parts of a plant.
Define Respiration In Plants: Is when plants use photosynthesis to make their own food to make energy for the plant's growth
Substances have a fixed arrangement of atoms. true or false (NO LINKS PLEASE)
Answer:
True
Explanation:
Would glucose be considered a natural resource of synthetic product?