Answer:
do you want to know why
Explanation:
inner core
What is mean by SI unit ?Mention any five physical quantities with their SI units.
Answer:
SI, The International System of Units is a scientific method of expressing the magnitudes or quantities.
amount of substance (mole)time (second)length (metre)mass (kilogram)electric current (ampere)Hope this helps!
Explain the structure of XeO3
The central Xe atom in XeO3 has three bonding domains and one lone pair of electrons. Hence, the electron geometry is tetrahedral and molecular geometry is pyramidal.
If a seed grows well in a very salty environment then that seed has a high salt tolerance.
O True
O False
POINTS AND BRAINIEST ANSWER!!!!
How many valence electrons does oxygen have after bonding?
How many valence electrons does hydrogen have after bonding?
Answer:
hydrgen = i think it is 4
oxygen = i think it is 3
Explanation:
What mass of Sodium Iodide (NaI) will react with 7.82 grams of Chlorine (Cl2)? 2NaI + Cl2 -------------> 2NaCl + I2
Answer:
16.49g
Explanation:
Given parameters:
Mass of Chlorine gas = 7.82g
Unknown:
Mass of NaI = ?
Solution:
The reaction equation is given as:
2NaI + Cl₂ → 2NaCl + I₂
To solve this problem, find the number of moles of the known specie first;
Number of moles of Cl₂ = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of Cl₂ = 2(35.5) = 71g/mol
Number of moles = [tex]\frac{7.82}{71}[/tex] = 0.11mole
From the balanced reaction equation;
2 mole of Cl₂ will react with 2 mole of NaI
0.11 mole of Cl₂ will also react with 0.11mole of NaI
Mass of NaI = number of moles x molar mass
Molar mass of NaI = 23 + 126.9 = 149.9g/mol
Mass of NaI = 0.11 x 149.9 = 16.49g
Please help do in 5 mins This system that breaks down food and absorbs food is called
Answer:
I think its digestive
Explanation:
............
So If 2 different elements make a compound, what does 2 compounds make?
Answer:
a mixture
Explanation:
How many grams of water (H2O) are there in 2.60 mol of the compound?
Answer:
46.839728 grams of water
Explanation:
1 mole is equal to 1 moles H2O, or 18.01528 grams
18.01528 times 2.6 = 46.839728
There are 46.839728 grams h20 in 2.60 mol of the compound
A combination of salt and sugar grains is best classified as a mixture because...
A the grains taste different from one another.
B both salt and sugar grains are in the same state of matter.
C no new chemical bonds are formed between the salt and sugar grains.
D a new product is formed when the salt and sugar grains are combined
Answer:
C
Explanation:
Thats just the answer
A combination of salt and sugar is classified as mixture because no new chemical bonds are formed between salt and sugar grains.
What are the properties of mixtures?Mixture is when two or more substances are present without undergoing any chemical change.As there is no chemical change taking place , substances do not loose their properties .Mixtures result as of blending,mixing.
Components of mixtures retain their original properties.Separation of each of the components can be done easily.The proportion of the components can be varied. There is no chemical force acting between components of mixtures.The proportions differ in an indefinite manner.
During formation of mixtures, there is no change in energy.Boiling and melting points depend on constituent elements present in the mixture.There are two types of mixture:
1) Heterogenous mixture
2) Homogenous mixture
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Which of the following gives a plant the carbon it needs to make glucose?
Water
Light Energy
Carbon Dioxide
Ouction 2
Answer:
light babsbabsbab
Explanation:
abbdbabsbabba
Can somepne help i'll give brainliest............
Knowing that 1.00 cal = 4.18 J, if an exothermic reaction releases 200 J, approximately how many calories is this equivalent to?
Explanation:
200 / 4.18 = 47.84 calories.
Which of the following statements is true about nuclear fusion? (4 points)
It occurs in the sun.
A heavy atom is split.
It can be controlled easily.
An electron is lost by the atom.
Let's understand Nuclear fusion first:
Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles.In the core of the Sun, hydrogen is being converted into helium. This is called nuclear fusion. It takes four hydrogen atoms to fuse into each helium atom. During the process some of the mass is converted into energy.Nuclear fusion reactions are difficult to control.Fusion does not produce nuclear waste, only the core of the reactor remains radioactive and only for 100 years.Learn more:
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If you have 10.0 g of hydrogen and 5.0 g of oxygen, what mass of the excess reagent remains after the completion of the reaction?
mass Hydrogen=9.376 g
Further explanationReaction
2H₂+O₂⇒2H₂O
mass H₂ = 10 g
mol H₂(MW=2 g/mol) :
10 : 2 = 5
mass O₂=5 g
mol O₂(MW=32 g/mol) :
5 : 32 = 0.156
O₂ limiting reactant
mol H₂: mol O₂ = 2: 1, so mol H₂ :
2 x 0.156 = 0.312
mol H₂ :
5 - 0.132 =4.688
mass of H₂ :
4.688 x 2 =9.376 g
Compared to 3.011 × 10²³ atoms of Na, 1.0 mole of Carbon
A. has the same number of atoms
B. has twice as many atoms
C. not enough information
D. has half as many atoms
Compared to 1.0 mole of H₂S (molar mass 334 g/mol), 1.0 mole of NH₃ (molar mass 17g/mol)
A. has half the number of molecules
B. not enough information
C. has twice the number of molecules
D. has the same number of molecules
Thank you!
1. B. has twice as many atoms
2. D. has the same number of molecules
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1.
3.011 × 10²³ atoms of Na, 1.0 mole of Carbon
1 mole Carbon = 6.02.10²³ atoms, so 1 mole of Carbon B. has twice as many atoms of Na
2.
1.0 mole of H₂S (molar mass 334 g/mol), 1.0 mole of NH₃ (molar mass 17g/mol)
Both have the same number of moles, so they have the same number of molecules
1.0 mole of NH₃ D. has the same number of molecules as 1.0 mole of H₂S
Name two-fluid technologies' that make
use of air.
PLEASE HELP! LOTS OF POINTS!!
The overall process of photosynthesis has the balanced chemical equation 6CO2 + 6H2O → C6H12O6 + 6O2. What does this tell you about the relative amounts of carbon dioxide and water consumed in this process?
Question 7 options:
A)
For every mole of carbon dioxide consumed, one mole of water is consumed.
B)
For every six grams of carbon dioxide consumed, one gram of water is consumed.
C)
For every gram of carbon dioxide consumed, one gram of water is consumed.
D)
For every six moles of carbon dioxide consumed, one mole of water is consumed.
Question 8 (5 points)
The possible products of a double displacement reaction in aqueous solution are (NH4)2S and NaNO3. Which of these possible products will form as a solid in this reaction?
Question 8 options:
A)
(NH4)2S
B)
Neither compound will form as a solid.
C)
NaNO3
D)
Both compounds will form as a solid.
Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 + 3CO → 2Fe + 3CO2. What does this tell you about the relative amounts of iron oxide and iron consumed and produced in this equation?
Question 10 options:
A)
For every gram of iron oxide consumed, two grams of iron are produced.
B)
For every two grams of iron oxide consumed, one gram of iron is produced.
C)
For every two moles of iron oxide consumed, one mole of iron is produced.
D)
For every mole of iron oxide consumed, two moles of iron are produced.
Answer:
Did you find the answer>
Explanation:
___1___Zn + __2___HCl → ___1___H2 + ____1__ZnCl2
How many grams of hydrogen gas form when 102 grams of hydrochloric acid reacts with 128 grams of zinc?
Answer:
Mass = 2.8 g
Explanation:
Given data:
Mass of HCl = 102 g
Mass of Zn = 128 g
Mass of H₂ = ?
Solution:
Chemical equation:
2HCl + Zn → H₂ + ZnCl₂
Number of moles of Zn:
Number of moles = mass/molar mass
Number of moles = 128 g/ 65.38 g/mol
Number of moles = 2 mol
Number of moles of HCl:
Number of moles = mass/molar mass
Number of moles = 102 g/ 36.5 g/mol
Number of moles = 2.8 mol
Now we will compare the moles of hydrogen gas with HCl and Zn.
HCl : H₂
2 : 1
2.8 : 1/2×2.8 = 1.4 mol
Zn : H₂
1 : 1
2 : 2
Number of moles of hydrogen formed by HCl are less thus it will limiting reactant.
Mass of Hydrogen:
Mass = number of moles × molar mass
Mass = 1.4 mol × 2 g/mol
Mass = 2.8 g
Measurements of water quality were taken a river downstream from an abandoned chemical dumpsite. Concentrations of a certain chemical were were obtained from 9 measurements taken at the surface of the water, 9 measurements taken at mid-depth of the water. And 9 measurements taken at the bottom of the water. What type of study was conducted, and what is the response variable of the study?
(a) An experiment was conducted, response variable is the connection of the chemical
(b) An experiment was conducted,response variable is the depth of the water
(c) A census was conducted, and the response variables is the depth of the water
(d) An observational study was conducted, and the response variable is the depth of the water
Answer:
(a) An experiment was conducted, response variable is the concentrations of the chemical
Explanation:
According to Oxford dictionary; an experiment is; "a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact."
The aim of the entire study is to discover the concentration of a certain chemical at various depths of the river. This means that the entire procedure was undertaken for the purpose of discovery. Hence it is an experiment.
The independent variable here is the depth of the river while the response variable is the concentration of the chemical of interest at each depth.
A responding variable changes as changes are made in the independent variable. The variable that is manipulated in an experiment is the independent variable.
Gene therapy has been used to treat and cure cystic fibrosis. Cystic fibrosis is caused by a
in a single gene.
Answer:
I believe it is mutation.
Explanation:
How many atoms of F are in the following formula: 3BaF2
1) 6
2) 3
3) 2
4) 5
Answer:
There are 6 atoms
Explanation:
2 from the subscript and multiply it by 3 cause of the coefficient.
There are only two F atoms in the chemical formula of BaF₂. Therefore, option (3) is correct.
What is the chemical formula?A chemical formula of a chemical compound gives information about the chemical proportions of elements in a chemical compound or molecule. The chemical formula of a compound can be written by using the chemical symbols of elements, numbers as subscripts, and some other symbols, such as dashes, brackets, plus (+) and minus (−) signs, and commas.
A chemical formula of a compound consists of no words but can be drawn in simple chemical structures but not complete structures. Chemical formulae of compounds must be limited in power than chemical names and structural formulae. In chemistry, we have two types of chemical formulas: empirical formulas and molecular formulas.
In the question, we have given the three moles of BaF₂ so the total number of fluorine atoms is 6. But the number of F atoms in the chemical formula of the BaF₂ is 2.
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What type of atom is hydrogen
Answer:
Protium
Explanation:
The hydrogen atom is the simplest of all atoms: it consists of a single proton and a single electron. In addition to the most common form of the hydrogen atom that is called protium, two other isotopes of hydrogen exist deuterium and tritium.
Answer: Hydrogen is a atom of the chemical element hydrogen.
Explanation:
Which biome contains mostly coniferous trees and receives 35 to 100 cm of rain per year? deciduous forest taiga (boreal forest) temperate rain forest tropical rain forest
option B, taiga (boreal forest).
(hope this helps ^^)
Answer:
b
Explanation:
Why do scientists continue to investigate certain topics like the atom?
How many double bonds are in CO2?
O 1
o 2
O 3
Explanation:
In CO₂ there's 2 double bonds.
Structure:
O=C=O (linear) (180°)
Therefore,
Option C is correct✔
Two students on opposite sides of a box apply forces to the box. What must be true if the
box does not accelerate?
Answer:
the students are pushing with equal force
Explanation:
A gas sample contained in a cylinder equipped with a moveable piston occupied 300.0 mL at a pressure of 2.00 atm. What would be the final pressure if the volume were increased to 500.0 mL at constant temperature?
Answer:
Explanation
hope this helps!
What reacts with carbonates to produce carbon dioxide ?
A. Litmus paper
B. Bases
C. Acids
D. Metals
Answer:
c
Explanation:
hope it helps :)
Answer:
C. Acids
Explanation:
Trust me.
PLS HELP ANYONE PLS BEGGING AT THIS POINT
What is the mass of 12 moles of tin?
Select one:
O a.118.719
O b. 1409
O c.0.109
O d. 1, 400g
Answer: 12 moles of tin is 1,400 or D
It might also be C
Explanation:one mole of tin is 118.71 so that times 12 is equal 1,424 . Round 1,424 and it is 1,400
what should we use in soap making process:-
a) potassium hydroxide
b) sodium hydroxide (lye)
Explain why it should be used
Answer:
Well either of them can be used but I would say B). Sodium hydroxide
Explanation:
Potassium Hydroxide is a type of lye specifically used to make liquid soap. It is also known as potash, lye or even KOH. This is the chemical that induces saponification of the fats and oils to create liquid soap. ... Our lye calculator makes this easy and allows you to select liquid soap as an option.
Sodium hydroxide, with the formula NaOH, is usually used in products as a pH adjuster. It's also used in soap-making to turn fats and oils into soap. You can find sodium hydroxide (also called caustic soda or lye) in its pure form in the cleaning aisle, since it's also really handy for clearing up clogged drains.
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