Answer:
its valency must be 3
hope it helps.
Answer: -3
Explanation: an element with atomic number of 15 is Phosphorus the Electronic configuration of phosphorous is 2, 8, 5. It has 5 electrons in its last orbit which can be completely filled by accepting 3 electrons.
How did Dalton atomic theory make the other Atomic theories possible? What essential information did his theory provide
John Dalton was born in a poor weaver's family in 1766 in England. He began his career as a teacher at the age of twelve. Seven years later he became a school principal. In 1793, Dalton left for Manchester to teach mathematics, physics and chemistry in a college. He spent most of his life there teaching and researching. In 1808, he presented his atomic theory which was a turning point in the study of matter.
Dalton's Atomic Theory:According to Dalton's Atomic theory, all matter whether an element, a compound or a mixture is composed of small particles called atoms.
The postulates of this theory may be stated as follows:
All matter is made of very tiny particles called atoms, which participate in chemical reactions.Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction.Atoms of a given element are identical in mass and chemical properties.Atoms of different elements have different masses and chemical properties.Atoms combine in the ratio of small whole numbers to form compounds.The relative number and kinds of atoms are constant in a given compound.An element whose atomic number is 19 is
I will mark brainliest
Answer:The answer is potassium.
infrared and raman spectra of magnesium ammonium phosphate hexahydrate ( struvite ) and its isomorphous analogues . i . spectra of protiated and partially deuterated magnesium potassium phosphate hexahydrate
Magnesium potassium phosphate hexahydrate and a number of its deuterated counterparts were studied for their Fourier transform infrared and Raman spectra. By contrasting the spectra obtained at the boiling point of liquid nitrogen with those obtained at ambient temperature and by examining the spectra of a succession of partially deuterated MgKPO4
What is Infrared and raman spectroscopy ?Raman and infrared spectroscopy both investigate how radiation interacts with molecular vibrations, but they do so in different ways depending on how the photon energy is delivered to the molecule by altering its vibrational state.
While IR spectroscopy depends on a change in the dipole moment, Raman spectroscopy depends on a change in the polarizability of a molecule. In contrast to IR spectroscopy, which measures the absolute frequencies at which a sample absorbs light, Raman spectroscopy measures the relative frequencies at which a sample scatters light.Learn more about Spectroscopy here
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What is the formula of the Lonic compound formed by the elements lithium and oxygen
Answer:
Li2O
Explanation:
Lithium is an alkali metal that has three protons and three electrons. Oxygen is a nonmetallic gas that has eight protons and eight electrons. Lithium and oxygen bond to form an ionic compound.
3Li : 1s2 2s1......Li+
8O : 1s2 2s2 2p4.....O2-
A substance is held in an open container. Its particles move past one another at random speeds but do not leave the container.
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Heat is removed from the system, and the particles slow down. When enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. When this happens, the substance enters its solid state.
A substance is held in an open container its particles move fast one another at random speeds but do not leave the container then When enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them
When more gas particles enter a container, there is less space for the particles to spread out, and they become compressed and the particles exert more force on the interior volume of the container and this force is called pressure and in gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container with an increase in temperature, the particles gain kinetic energy and move faster and that's why in the open container particles moves fast one another and when enough heat is removed then the particles no longer have enough speed to overcome the weak attractive forces between them
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Most hydrogen (H, #1) atoms have a mass of 1. How many neutrons would there be in one of these hydrogen atoms? (1 pt)
*
1 point
0
1
2
4
0
Explanation:All atoms are made up of particles known as protons, neutrons, and electrons.
Mass Number
The mass number of an atom is most commonly given in amus. Amu stands for atomic mass unit. In an atom, a proton = 1 amu, a neutron = 1 amu, and an electron = 0 amu. Since atoms are so small, it is hard to measure a singular in normal units such as grams. So, instead, scientists use amus. Comparatively, protons and neutrons are far larger than electrons. This is why electrons are given a mass of 0 amu. Of course, electrons do technically have mass, but that mass is so small that it is negligible in many calculations.
Counting Neutrons
When given the atomic number and mass number, it is easy to find the number of neutrons. The atomic number of an element tells you how many protons there are. The mass number gives you the mass of the atom in amus; this number is equal to protons + neutrons. This means that mass number - atomic number = neutron number.
So, we can set up a very simple equation to find the number of neutrons.
1 - 1 = 0 neutrons.Most hydrogen atoms have no neutrons.
A plant cell takes in carbon dioxide gas, sunlight, and water. Structures in the cell produce sugar for the
plant to use as food to power cell processes. Which characteristic of life is BEST described in this scenario?
#1 of 6-
A All living things respond to stimulus.
B All living things obtain and use materials and energy.
C All living things contain DNA.
D
All living things grow and develop.
G
Answer:
D All living things grow and develop
Explanation:
the question is asking about photosynthesis and use of sugar for metabolic process like growth , use of energy for cell divison etc . this is basic for all living things.
the burning of fossil fuels for energy in the modern era of life on earth is resulting in a significant increase in total co2 concentration in earth’s atmosphere. however, the ratio of 14c to 12c is decreasing. why is this? the 14c in fossil fuels is not effectively converted to 14co2 in combustion. it is difficult to detect the 14c when total co2 levels are so high. all 14c in the fossil fuels is removed during the industrial refining processes. fossil fuels are so old that any 14c in the starting organic matter has decayed.
The fossil fuel which normally contains contains high carbon sources. When it burnt it'll produce a lot of carbon dioxide increasing in its concentration in the atmosphere. But the ratio of 14C to 12C is decreasing because the age of those fossil fuel are so high that the carbon's content is ruined.
What is Fossil Fuels? Fossil fuels are the fabric that contains hydrocarbons that are generated from the dead remains and decay of plants and animals that are buried underground for many years.They are extracted and burned by humans by the tatic of energy for various uses.Uses of Fossil Fuels? natural gascoalpetroleumThese are Extracted by Humans through the method of Drilling and Mining.
Petroleum:It is also called oil and is most often used as the discussed from of fossil fuel in the world today. Crude Oil is also the form of Petroleum.Petroleum is consist carbon and hydrogen which has gone through an organic phase in the plant having single cell and animals.Petroleum is known by its predominant hydrocarbon.Natural Gas: It is made up of Methane and is very light in weight.Natural Gas is found Deep down the Earth's Surface.colour, odour, and flammability are three main properties of Natural Gas. Coal:coal may be a type of Solid which is Black in colour.Coal are often recovered by under ground Mining.oxygen, carbon, nitrogen, hydrogen, and sulphur, are the five major element of Coal.
Thus from the above conclusion we can say that, ratio of 14C to 12C is decreasing because the age of these fossil fuel are so high that the carbon's content is ruined.
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A student is running an experiment in which 65.0 grams of BaI2 is needed, but the only jar of reagent in the lab is labelled barium iodide dihydrate. How many grams of the hydrate must the student weigh out in order to get the desired amount of the anhydrous compound?
The required amount of the dihydrate in the question is 71g of the dihydrate.
What is the mass of the dihydrate?We know that a compound could have a water of crystallization. This water of crystallization is attached to the molecule of the compound and is involved when we are calculating the molar mass of the compound.
Now we have the mass of the anhydrous compound that is required as 65 g.
Molar mass of the anhydrous compound = 391 g/mol
Molar mass of the dihydrate 427 g/mol
Given that;
Number of moles of hydrated compound = Number of moles of anhydrous compound
x/427 = 65/391
x = 65/391 * 427
x = 71 g
Thus, we would require 71g of the dihydrate.
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Describe Lithium, Beryllium, Calcium, Aluminium, Argons' position in the periodic table.
Answer:
Explanation:
lithium (Li), chemical element of Group 1 (Ia) in the periodic table, the alkali metal group, lightest of the solid elements. The metal itself—which is soft, white, and lustrous—and several of its alloys and compounds are produced on an industrial scale.
Boiling point: 1,342 °C (2,448 °F)
Oxidation state: +1
Electron configuration: 2-1 or 1s22s1
Beryllium is an element with an atomic number of 4 in the periodic table. It is a bivalent and highly toxic element. The element has one of the highest melting points among the light metals. Beryllium exists in 30 different minerals, among which bertrandite, beryl, chrysoberyl, and phenacite are the most important.
The chemical element Calcium (Ca), atomic number 20, is the fifth element and the third most abundant metal in the earth's crust.
Atomic number: 20
Atomic mass: 40.08 g.mol -1
Standard potential: - 2.87 V
Electronic configuration: 4s2
Where Is Aluminum Found On The Periodic Table? Aluminum is the 13th element on the periodic table. It is located in period 3 and group 13.
Argon is a chemical element with the symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. Argon is the third-most abundant gas in the Earth's atmosphere, at 0.934% (9340 ppmv).
Appearance: colorless gas exhibiting a lilac
Group: group 18 (noble gases)
Phase at STP: gas
Speed of sound: 323 m/s (gas, at 27 °C)
can anyone pls answerr
Answer:
3. J.J. Thomson & electron
4. b) nucleus
5. neutrons & protons
6. electrons
a handbook lists the density of lead as 11.3 g/ml. several groups of students are attempting to determine the density of a lead weight by various methods. calculate the average density measured by each group, and the percentage error in each average.
The average density measured by each group, and the percentage error in each average is 0.88 % , 1.18 % , - 1.77% .
Equation :Group 1 :
= d (trial 1 +2+3) / 3
= 12.7 + 11.32 + 10.3 / 3
= 11.4 g/ml
% error = [(E.V - T.V) / T.V ] x 100
= [( 11.4 - 11.3 ) /11.3 ] x 100
= 0.88 %
Group 2 :
d = A.J + 11.4 + 11.4/3
= 11.43 g/ml
% error = 11.433 - 11.3 / 11.3 x 100
= 1.18 %
Group 3 :
d = 10.9 + 11.3 + 11.1 / 3
= 11.10 g/ml
% error = 11.10 - 11.3 / 11.3 x 100
= - 1.77%
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I understand the question you are looking for :
handbook lists the density of lead as 11.3 gmL, Several groups of students are attempting to determine the density of a lead weight by various methods. Calculate the average density measured by each group. and the percentage error in each average. Measured densities (g/mL) Group [ Group 2 Group 3 Trial 12.7 113 10.9 Trial 2 11.2 114 11.3 Trial 3 10.3 114 11.1 average density of group 1: glmL percent error of group average density of group 2: glmL percent error of group 2: average density of group 3: glmL percent error of group 3: Which group was most accurate? Which group was most precise? group group 2 group group 3 group 3 group
an automobile gasoline tank holds 21.0 gal21.0 gal when full. how many pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml0.737 g/ml ?
129 pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml.
What is Stoichiometry ?Stoichiometry helps us use the balanced chemical equation to measures quantitative relationships and it is to calculate the amount of products and reactants that are given in a reaction.
What is Density ?Density is defined as mass per unit volume. S.I unit if density is kg/m³.
It is expressed as
Density = [tex]\frac{\text{Mass}}{\text{Volume}}[/tex] or [tex]d = \frac{m}{V}[/tex]
Now,
= [tex]21.0\ \text{gallon} \times \frac{3.785\ L}{1\text{gallon}} \times \frac{1000\ mL}{1\ L} \times \frac{0.737\ g}{1\ mL} \times \frac{1\ kg}{1000\ g} \times \frac{2.2046\ \text{pounds}}{1\ kg}[/tex]
= [tex]\frac{21.0 \times 3.785 \times 1000 \times 0.737 \times 2.2046}{1 \times 1 \times 1000 \times 1}\ \text{pounds}[/tex]
= 129 pounds.
Thus from the above conclusion we can say that 129 pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml.
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SCOPE OF NUCLEAR ENERGY IN NEPAL"
Answer:
intruducing nuclear in a country like nepal where the knowledge of nuclear science is limited is a major task.
Explanation:
(maybe it will help if not sorry because my answer is wrong)
Nepal is a landlocked country that has been facing challenges in meeting its energy demand. The country is heavily dependent on imported fossil fuels, which are expensive and have negative environmental impacts.
Nuclear energy is the energy that is released from the nucleus of an atom through a process called nuclear reaction. Nuclear reactions can occur spontaneously or can be induced by bombarding the nucleus with particles such as neutrons.
However, Nepal currently does not have any nuclear power plants, and the country has not developed any nuclear energy infrastructure. Therefore, the development of nuclear energy in Nepal would require significant investment in terms of time, money, and human resources. Additionally, there are concerns about the safety and security of nuclear energy, and these issues would need to be addressed before nuclear energy could be developed in Nepal.
Despite these challenges, there are some potential benefits to the development of nuclear energy in Nepal. Nuclear energy has the potential to provide a reliable source of energy that is not dependent on imported fossil fuels. Additionally, nuclear energy is a low-carbon source of energy that could help Nepal reduce its greenhouse gas emissions and mitigate the impacts of climate change.
In conclusion, the development of nuclear energy in Nepal is a complex issue that requires careful consideration of the potential benefits and risks. While nuclear energy could provide a reliable and low-carbon source of energy, there are significant challenges that would need to be addressed before nuclear energy could be developed in Nepal.
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how much water should be added to 28 ml of 15% alcohol solution to reduce the concentration to 14%?
The amount of water that should be added to 28 ml of 15% alcohol solution to reduce the concentration to 14% is: 2 ml
To solve this problem, the formula and the procedure that we have to use is:
c1 * v1 = c2 * v2
Where:
c1= concentration of the concentrated solutionv1 = volume of the concentrated solutionc2 = concentration of the diluted solutionv2 = volume of the diluted solutionInformation about the problem:
c1 = 15%v1=28 mlc2 = 14%v2=?amount of water should be added=?Applying the dissolution of concentrations formula and clearing the volume of the diluted solution (v2) we get:
c1 * v1 = c2 * v2
v2 = (c1 * v1)/ c2
v2 = (15% * 28 ml)/ 14%
v2= 30 ml
In order to know how much water should be added we have to subtract 28 ml from the volume of the diluted solution:
amount of water should be added = v2 - v1
amount of water should be added = 30 ml - 28 ml
amount of water should be added = 2 ml
What is a solution?In chemistry a solution is known as a homogeneous mixture of two or more components called:
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How many square centimeters are in an area of 5.50 inch² ?
Which 2 organelles work together to make proteins in the cell?
A, B or C
suppose that 4.67 g of a silver salt ( agx ) is dissolved in 715.0 ml of water. a current of 2.48 a , applied for 1430 s , is required to plate out all of the silver in solution. what is the mass percentage of silver in the salt?
Ag^t + e^- ------> Ag
I = 2.48 A
t = 1430 s
q = It = 2.22×1180 = 3729.6
ne- = q/F = 3729.6/96485 = 0.03+
What is mass percentage ?The mass percent is calculated by dividing the mass of the compound or solute by the mass of the element or solute. A percent is obtained by multiplying the result by 100. The mass percent formula is (mass of element in 1 mole of compound / mass of 1 mole of compound) x 100 to determine the amount of an element in a compound.
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WHICH IS A PROPERTY OF ALL BASES?
A. Their formulas include H3O+ ions
B. They increase the OH- concentration in solution
C. They increase the H3O+ concentration in solution
D. Their formulas include OH- ions
According to the research, the correct option is B. They increase the OH- concentration in solution is a property of all bases.
What is a base?It is the substance that has alkalinity that, when in solution, increases the concentration of hydroxyl ions (OH-) and establishes combinations with acids for the development of salts.
They are soluble in water and usually have a bitter taste and by providing hydroxyl ions to the medium, they are capable of neutralizing acids.
Therefore, we can conclude that according to the research, the correct option is B. They increase the OH- concentration in solution is a property of all bases.
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Which words correctly describe CO2? Select all that apply.
It is a mixture.
It is an element.
It is a substance.
It is a compound.
Answer:
chemical compound
Explanation:
Carbon dioxide is a chemical compound that consists of two oxygen atoms and one carbon atom
Which of the following rocks are composed of nonmineral matter?
granite
coal
rock salt
conglomerate
gneiss
shale
Answer:
yes
Explanation:
I can't think
During a solvent extraction, a student lost track of which layer was the aqueous layer and which was the organic layer. What simple, non‑destructive test could be used to determine which layer is which?.
Non‑destructive test could be used to determine which layer is which is:
a. add a little distilled water to see which layer the water adds to.
Aqueous layer will be dissolved in water, while the organic layer not.
Water is polar substance as the аqueous layer, while organic layer is nonpolar substance.
Water is a “universal" solvent.
The ability of water to function as a versatile solvent arise from the structure of water molecules.
Other test methods are destructive.
A supercritical extraction is used to separate substances using a supercritical fluid as a solvent. The pressure and temperature of the supercritical fluid are higher than the critical point.
A separatory funnel is used to separate liquids.
In IR spectroscopy, substances have the interaction with infrared radiation.
Missing options:
a. add a little distilled water to see which layer the water adds to
b. obtain a sample of the solution in the seperatory funnel and utilize IR
c. ask the instructor if you can perform a supercritical extraction of the sample
d. obtain a sample of solution in seperatory funnel and utilize NMR
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The average human adult requires 2000 kcal/day from food consumption. Calculate
how many kcal are required for one year. [1 kcal = 1000 calories], [1 calorie = 4.2
joules of energy].
2,200
The kcal required for one year is 730kcal (kilo calories).
A calorie is a unit of energy measurement. Typically, the energy content of meals and beverages is determined in terms of calories. You must consume fewer calories each day than your body uses up in order to lose weight. On the other hand, in order to gain weight, you must eat more calories than you burn.
The daily caloric needs of adult women range from 1,600 to 2,200. Estimates for men range from 2,000 to 3,200 per day. The low end of the range may be ideal for you if you move very little or not at all during the day. If you are very active throughout the day, the high end of the range can better match your needs. The number of calories we require decreases as we age.
The kcal required for one year is:
2000 X 365 days= 730000 calories.
so as 1Kcal= 1000 calories
73000cal= 730Kcal.
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What is made of only one type of atom?
Answer:
element
Explanation:
its the only substance type of antom called the element so yeah
When pol filled another test tube to the top, the liquid formed a low dome, which is evidence of.
When pol filled another test tube to the top, the liquid formed a low dome, which is evidence of cohesion.
The dome-like shape forms some properties of cohesion due to the water molecules, or termed as their tendency to stick up to one another is expressed by the property of cohesion of water.
Cohesion can be considered as an act, state, and the process of sticking alike molecules together consisting of alike molecules or otherwise entities. An example showing cohesion is of course water molecules. The tendency of several water molecules to compact together is referred to as cohesion property and is held together by a particular cohesive force described as an intermolecular hydrogen bond.
Water is attracted to water itself whereas, in adhesion, water is attracted to some other substances. Adhesion and cohesion are generally considered properties of water that can affect every water molecule present on the Earth and also the water molecule interaction with molecules of other substances as well.
Cohesion is also depicted as an ordinal type of measurement and is generally described as having “high cohesion” or “low cohesion” properties. Modules having high cohesion tend to be preferable, due to which high cohesion is associated with a variety of desirable traits included in software such as reliability, reusability as well as understandability.
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OH FiverT22 I NEED YOUR HELP OR ANYONE WHO CAN
Which of the following materials contains a base?
Select one:
a. Stomach digestive juices
b. Orange juice
c. Ammonia window cleaner
d. Vinegar
Ammonia window cleaner materials contains a base
Window cleaner contains ammonia which is basic and used for removing dust and grease on the windows, and also for hard water stain on window. ammonia is generally basic in nature according to the Arrhenius theory as well as Lewis acid base theory but it behave as acid only in the presence of strong acid that can extract a proton out of it. in window cleaner ammonium hydroxide is used as a window clear and because of hydroxide it is base because hydroxide is basic in nature and ammonia is alkaline in nature that's why ammonia window cleaner materials contains a base.
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How do I do this gas phase equilibrium problem?
The equilibrium constant is the ratio of the reactants to the products which is 2.
What is equilibrium constant?The equilibrium constant shows the extent to which the reactants are converted into products. The equation of this reaction could be written from the number of molecules of the reactants.
Let the reactants be A and B and the product C, the reaction equation thus becomes;
The equilibrium constant is the ratio of the reactants to the products which is 2.
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calculate the mass of tetraborane b4h10 that contains a million ×1.00106 boron atoms. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
Tetraborane(B₄H₁₀) has a mass of 2.21×10¯¹⁴ g and one billion (1×10⁹) boron atoms.
TetraboraneAlfred Stock initially isolated tetraborane, which was the first boron hydride chemical to be categorised by Stock and Messenez in 1912. At room temperature, it is a gas and has a boiling point that is quite low (18 °C). Tetraborane gas has a bad odour and is poisonous.Formula B4H102.3 g/cm3 for densityBoranes categoryA reaction between acid and magnesium, aluminium, or beryllium borides can result in the production of tetraborane. Tetraborane is also produced by the pyrolysis of diborane, hydrogenation of boron halides at high temperatures, and hydrolysis of magnesium boride. One of the first reactions to produce a significant amount of tetraborane (14% yield) was the hydrolysis of magnesium boride.learn more about Tetraborane here
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What characteristics do elements within a group share with one another?
O all exist in the same state of matter
O all have the same atomic mass
O all have the same number of neutrons
O all have similar chemical and physical properties
Answer:All have Chemical and Physical properties
Explanation:
HOW MANY GRAMS ARE IN 43.12 KG? WHAT IS THE UNIT?
Answer:43.12 KG = 43,120 grams
Explanation:1 kilogram is equal to 1,000 grams.
Answer:
43120 g
Explanation:
1 kg = 1000 g
43.12 = 1000(43.12) g
1000(43.12) = 43120
The unit is g because we are converting to grams, and the abbreviation for grams is g.
∴ 43.12 kg = 43120 g