Calculate the molecular mass of the element
They give:H=1,AI=27,S=32,0=16,Cu=64,P=31,Mg=24,N=14,Na=23
Answers
Answer:
Mg (NO3)2
24 + 2×(14+ 3×16)
24+2×(14+48)
24+2×(62)
24+ 124
=148g
Related Questions
Which type of dry-chemical fixed application method introduces a concentration of agent into a closed area
Answers
Actuating mechanism is the dry-chemical fixed application method which
introduces a concentration of agent into a closed area.
The actuating mechanism is commonly used in piping systems and
involves the transport of a control member in automatic or remote control
systems.
The closed system makes manual navigation very difficult which is why the
actuating mechanism in automatic systems are usually used to make it less
tedious and accurate.
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A sample of gold has a mass of 100 grams and a volume of 5cm^3, calculate the density by dividing the mass by volume
Answers
Answer:
20cm^2
Explanation:
Here, Density= Mass/ Volume
=100/5
= 20 cm^2
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find the mistakes and rewrite
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Atoms are the smallest particle that make up living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons and neutrons are in the nucleus and the protons orbit around the nucleus. Of the subatomic particles, the electrons have the largest mass and are negatively charged, the neutrons (negative charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons, so carry no overall charge. An element is a substance made up of only two types of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass which represents the number of electrons or neutrons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
Answers
Answer:
Atoms are the smallest particle that make up living both living and non living things, they are made up of subatomic particles; protons, neutrons and electrons. Of these the electrons protons and neutrons are in the nucleus and the protons electrons orbit around the nucleus. Of the subatomic particles, the electrons have the largest smallest mass and are negatively charged, the neutrons (negative charge) (no charge) and protons (positively charged) both have a relative mass of 1. Atoms contain an equal number of protons and neutrons electrons, so carry no overall charge. An element is a substance made up of only two one type of atom. Elements can be found in the Periodic table of elements, they usually have two numbers next to the chemical symbol, the larger number is generally the atomic mass number, which represents the number of neutrons and the number of protons. The smaller number is the relative atomic mass atomic number which represents the number of electrons or neutrons protons. In order to calculate the number of neutrons, you minus the atomic number from the relative atomic mass.
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More than 7,000 islands in the Philippines lack access to electricity, so after the sun goes down, light usually comes through kerosene lamps. While cheap, these fire hazards are bad for the environment and human health.
You are an entrepreneur and would like to suggest to the government of the Philippines a better solution to this problem. But to come up with the solution to this problem, you must first understand the nature of chemical bonding and factors that control the structure of compounds. You will study and understand natural materials behavior to build a very cheap and environmentally friendly lamp.
What material do you think can be a cheaper and better alternative to kerosene?
Question 2 options:
There is no better alternative to kerosene.
A material that contains ions, so it can conduct electricity.
A material that contains gas, as gases can conduct electricity.
A material having covalent boding.
Answers
Answer:
Question 1: What material do you think can be a cheaper and better alternative to kerosene?
Answer: Generic lamp oil can be used to replace kerosene in lamps. The cheaper lamp oil burns cleaner and has less odor than the more expensive kerosene.
Question 2:
Correct answer is the last option
Hope this helps!
The measurable properties of a substance, such as vapor pressure and surface tension, occur due to the strength of
electrical forces between particles, as given by Coulomb's law
electrical forces between particles, as given by Newton's law
gravitational forces between particles, as given by Newton's law
O gravitational forces between particles, as given by Coulomb's law
Answers
Answer:
electrical forces between particles, as given by coulombs law.
Explanation:
Properties of a substance such as vapor pressure and surface tension depend on electrical forces between particles, as given by Coulomb's law.
The vapor pressure refers to how easily a liquid converts to gas while surface tension is the force that makes a liquid surface act as a stretched elastic skin.
Both vapor pressure and surface tension has a lot to do with the degree of polarity in a molecule. Usually, polar molecules have a low vapor pressure and high surface tension due to a high electrical forces between particles, as given by Coulomb's law.
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HELP !!
Given the balanced chemical equation:
4 Fe + 3 O2 ----> 2 Fe2O3
How many moles of iron(III) oxide, Fe2O3 , will be produced if 12 moles of oxygen gas, O2 , are consumed
Answers
Answer:
8 moles of Fe2O3
Explanation:
You can use the mole ratio give. For every 3 O2 you produce 2 Fe2O3. With this you can find the number of moles. 12 O2 multiplied by the ratio 2/3 gives you 8 moles
how did JJ Thomson discovered the electron explain his plum pudding model of the atom
Answers
Compared to the energy of an electron in the second shell of an atom of sulfur, the energy of an electron in the
1
first shell is lower
2
first shell is the same.
3
third shell is lower
4
third shell is the same.
Answers
Answer:
First shell is lower
Explanation:
The electron has to absorb energy to excite and go to higher energy levels/ shells and should release energy to go to lower energy levels/ shells. This means higher the shell , more energy is required and vice versa
What does the word "dutile" mean when used to refer to elements?
Answers
Answer:
capable of being hammered out thin, as certain metals; malleable.
Explanation:
why the mixture of bromine and ethane is discoloured when left in the sun
Answers
Answer:
In the presence of UV light, ethane will react with bromine in a substitution reaction. UV light is the condition under which the reaction will occur so it is written above the arrow in the chemical equation. As the reaction proceeds, the intensity of the re-brown colour of the bromine water decreases.
Answer:
here ya go
Explanation:
combining bromine and ethane leads to a brown gas or liquid which is made of the elements. it is a gas at room temperature and does not affect human beings. there are many uses for bromine compounds but they are mainly used for the manufacturing of chlorine, fire retadants, water purification, graphy chemicals and pharmaceutcals. it is a naturally occurring element that can be found in animals such as sharks since they produce their own.
What is an ionic bond.
Answers
Answer:
ionic bond is the type of bond formed from electrostatic attraction between oppositely charged ion in a chemical compound
What is the relationship between the pressure of a gas and the absolute
temperature?
Answers
they don't have any relationship between them
When pyridine is treated with a mixture of nitric and sulfuric acids, the major product is:.
Answers
Answer: 3-nitropyridine
Explanation:
Explain why some metals are extracted by heating their oxides with carbon, but some metals cannot be extracted in this way
Answers
Answer:
This happens because a metal is less reactive than carbon and it can be extracted from its oxides by heating with carbon. The carbon displaces metal from the compound and removes the oxygen from the oxide.
what is the mass of the product of 111.6g and 48g
Answers
Answer:
159.6
Explanation:
Due to the law of conservation of mass, mass is neither created nor destroyed in a chemical reaction. Hence, the mass of the product is the equivalent of the mass of the sum of the reactants.
HURRY for a BRAINLIST
Answers
Answer:
B
Explanation:
Answer:
answers
B
Explanation:
Explicaciónexplicacaca
¿Cuáles son las características que presentan las enzimas? Explica cada una
Answers
Answer:
Acelera las reacciones químicas.
Se requieren en cantidades mínimas.
Son muy específicos en su acción.
Se ven afectados por la temperatura.
Se ven afectados por el pH.
Algunos catalizan reacciones reversibles.
Algunos requieren coenzimas.
Son inhibidos por inhibidores.
Explanation:
How viscosity affects the speed of the liquid in the convection cell.
Answers
Explanation:
eggsus8d8ruttuririiryrey
How many atoms exist in 100.0 grams of lithium
Answers
Conversion relationship: 1 mole Li=6.94 g Li
100.0 g Li 1 mole Li
---------- x ---------- = 14.4 moles Li
1 6.94 g Li
Conversion relationship: 1 mole Li=6.02x10^23 atoms Li
14.4 moles Li 6.02x10^23 atoms Li
-------------- x ----------------------- = 8.67x10^24 atoms Li
1 1 mole Li
Which of the following are required for plants to carry out photosynthesis?
Answers
Answer:
To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight
Which ground-state atom has an electron configuration described by the following orbital diagram?.
Answers
Answer:
The energy of atomic orbitals increases as the principal quantum number, n, increases. In any atom with two or more electrons, the repulsion between the electrons makes energies of subshells with different values of I differ so that the energy of the orbitals increases within a shell in the order s< p <d<f. Figure 1 depicts how these two trends in increasing energy relate. The 1s orbital at the bottom of the diagram is the orbital with electrons of lowest energy. The energy increases as we move up to the 2s and then 2p, 3s, and 3p orbitals, showing that the increasing n value has more influence on energy than the increasing I value for small atoms. However, this pattern does not hold for larger atoms. The 3d orbital is higher in energy than the 4s orbital. Such overlaps continue to occur frequently as we move up the chart.
Why does water freeze at a temperature lower than 0°c when salt is added to it.
Answers
Answer:
Salt molecules block water molecules from packing together when temperature is lowered. It then prevents them from becoming ice. More water molecules leave the solid phase than the ones entering the solid phase. Freezing point depression occurs when the freezing point of the liquid is lowered by addition of solute.
Explanation:
i need help on this plsss
Answers
Answer:
Ionic Compound
Explanation:
1) NaBr
2) CaCl2
3) MgS
4) AlO
5) Li3P
6) Cs3N
7) KI
8) BaF2
9) RbNO2
10) BaO
11) Potassium oxide
12) Magnesium iodide
13) Aluminum chloride
14) Calcium bromide
15) Sodium nitride
16) Lithium fluoride
17) Barium phosphide
18) Dicesium sulfide
19) Strontium fluoride
20) Sodium chloride
Hope this helps!!
what is ammonium chloride
Answers
Answer:
Ammonium chloride (a chemical compound) is an inorganic compound with the formula NH₄Cl and a white crystalline salt that is highly soluble in water. Solutions of ammonium chloride are mildly acidic. In its naturally occurring mineralogic form, it is known as sal ammoniac.
Which of these figures correctly illustrates the nature of the bonding of h2o?.
Answers
H2O is composed of two hydrogen atoms and one oxygen atom. The central oxygen atom is sp3 hybridized.
H2O is composed of two hydrogen atoms and one oxygen atom. The oxygen atom is bonded to the two hydrogen atoms at a dihedral angle of 104°. There are two lone pairs on the oxygen atom. The molecule has a bent geometry.
The structure of H2O is shown in the image attached to this answer. The central oxygen atom is sp3 hybridized and the shape of the molecule is based on a tetrahedron owing to its electron pair geometry.
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where electrons are likely to be found as they travel around the nucleus
Answers
Answer:
The electrons are most likely to be found in An orbital
To make hot cocoa on the trip, you will need to boil water. Construct an
explanation that describes how the lower air pressure in the mountains affects
this process.
i need an answer in under an hour pls help
Answers
Answer:
the water in the mountains will take longer to boil, because of the higher atmospheric pressu
Answer please
.............................................................
Answers
This is not exactly a answer you can use but this is some information that you can use to find out the answer.
You can usually confirm the charge associate degree particle unremarkably has by the element's position on the periodic table: The alkali metals (the IA elements) lose one negatron to create a ion with a 1+ charge. The alkaline-earth metal metals (IIA elements) lose 2 electrons to create a 2+ ion.
Nonmetals type negative ions (anions). A range 7|chemical element|element|gas} atom should gain 3 electrons to possess an equivalent number of electrons as AN atom of the subsequent gas, neon. Thus, a gas atom can type AN ion with 3 additional electrons than protons and a charge of 3−.
Arrange the events for the hydrolysis of amide bonds by chymotrypsin in their correct order.
1. attack by Ser 195 to give a tetrahedral intermediate
2. protonation by His 57 and release of the free C-terminus of the hydrolyzed bond
3. protonation by His 57 and release of the free N-terminus of the hydrolyzed bond
4. attack by water, leading to formation of a tetrahedral intermediate
5. binding of substrate to properly position the scissile bond for cleavage
a. 5, 1, 3, 4, 2
b. 5,1,2,4,3 5,
c. 1, 3, 2,4 5,
d. 2, 4, 3, 1
Answers
Answer:
The answer is A
Explanation:
the order 5,1,3,4,2
Describe how the suspects used the chemicals found at the crime scene to make the copper coins look silver.
Answers
The chemicals found at the crime scene although not mentioned must be Sodium zincate.
Discussion:
An interesting demonstration to show plating and alloys is the conversion of copper coins to silver look-alike coins.
A 'copper' coin when dipped into a solution of sodium zincate in contact with zinc. The coin is plated with zinc and appears silver in colour.
This is a common chemistry classroom trick.
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