Answer:
yes gold is pure
Explanation:
Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics?
Answer:
Elements in the same group has different physical properties such as boiling and melting points. However there are trends of their physical properties down the group.
Explanation:
You should look at the perdoic table to for extra help
The boiling points and melting points of the given elements does not support the claim that elements of the same group have similar physical properties.
What are boiling point and melting point?The boiling point of a substance is the temperature at which it changes from liquid state to gaseous state. Melting point is the temperature at which the substance changes from solid to liquid state.
Elements in the same group shows similar physical and chemical properties. But from the boiling and melting point we cant say that they are in the same group.
Elements in a group shows a trend in boiling point and melting point but cannot be distinguished with this from other groups.
Hence, boiling point and melting point of the elements do no support for the similar properties in a group.
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Your question is incomplete, but most probably your full question was,
Do the boiling points and melting points of these elements support the claim that elements of the same group have similar physical characteristics? (image uploaded)
2NaClO3 ——> 2NaCl + 3O2
1) if you produced 114.25g NaCl, how many grams of NaClO3 did you decompose?
2) Using the same reaction in the first exercise; how many particles of NaClO3 are needed to
produce 68.30L of oxygen?
Answer:
1) 208.09 g2) 7.11 × 10²² particlesExplanation:NUMBER ONEFind moles of Known Substance (NaCl)
Moles of NaCl = mass ÷ molar mass
= 114.25 g ÷ 58.44 g/mol
= 1.955 mol
Use Mole Ratio of Known to Unknown (NaCl : NaClO₃) to Determine Moles of Unknown
The mole ratio of NaCl to NaClO₃ is 2 to 2 or simply 1 to 1.
This means that for each mole of NaCl produced the same number of moles of NaClO₃ was decomposed.
∴ since moles of NaCl = 1.955 mol,
then moles of NaClO₃ = 1.955 mol
Find Mass of Unknown
Mass of NaClO₃ = moles × molar mass
= 1.955 mol × 106.44 g/mol
= 208.09 g
NUMBER TWODetermine the Moles of Known (O₂)
moles of O₂ = (volume × density) ÷ molar mass
= (68.30 L × 0.0828 g/L) ÷ 32 g/mol
= 0.177 mol
Use Mole Ratio of Known to Unknown (O₂ : NaClO₃) to Determine Moles of Unknown
Mole ratio of O₂ : NaClO₃ is 3 : 2. Therefore for each mole of oxygen produced, ²/₃ the moles of NaClO₃ is produced.
∴ if moles of O₂ = 0.177 mol
then moles of NaClO₃ = 0.177 mol × ²/₃
= 0.118 mol
Find the Number of Particles of Unknown
Number of particles = moles × Avogadro's Number
= 0.118 mol × (6.022 × 10²³ particles/mol)
= 7.11 × 10²² particles
Which answer choice is it?
A 3d
B 4p
C 4d
D 4f
Answer:
3d
Explanation:
how many atoms of hydrogen are in 4Ca(OH)2
Explanation:
there are 8 atoms of hydrogen
What kind of interaction
(attraction/repulsion) will happen
between the core electrons and the
valence electrons?
Elements in which the d-sublevel is being filled have the properties of
Answer:
Elements in which the d-sublevel is being filled have the properties of metals
Elements in which the d-sublevel is being filled have the properties of;
transition metals.
In quantum theory the sublevel is an energy level. Now, the d-sublevel in atomic configuration has 5 orbitals and as such can contain a maximum of 10 electrons.
Now, this d-sublevel is used primarily by elements called "transition elements" as they are also called d-block elements.
However, these transition elements are also called transition metals because all the transition elements possess properties of metals generally.
In conclusion, elements in which the d-sublevel is being filled have the properties of transition metals.
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a scientist uses 52g of Na2SO4 for a chemical reaction. how many moles of Na atom does the compound contain a) 0.366 b) 0.732 c) 8.422 d)16.845
Answer:
b). 0.732
Explanation:
52g Na₂SO₄ x 1 mol Na₂SO₄ x 2 mol Na
------------------------- -------------------- = 0.732 mol Na
142.04 g Na₂SO₄ 1 mol Na₂SO₄
Atomic Mass Units
Na₂ = 22.99 x 2 = 45.98
S = 32.06
O₄ = 16 x 4 = 64
Na₂SO₄ = 45.98 + 32.06 + 64 = 142.04
There are 2 moles of Na in 1 mole of Na₂SO₄
Which is NOT part of the Cell Theory?
A: All cells come from existing cells
B: Microscopic organisms are not made of cells
C: All living things are made of one or more cells
D: Cells are the basic unit of structure and function in living things
Answer:
B: Microscopic organisms are not made of cells
Explanation:
1. Every summer Cheyanne drives to California. It is 3600 km to get there. If she spends 32 hours driving, what is her speed?
Answer:
Their speed = 69.9043 miles per hour
orTheir speed = 112.5 kilometers per hour
Explanation:
Calcium carbonate decomposes into calcium oxide and carbon dioxide when heated. Calculate the mass of carbon dioxide released when 300 g of calcium carbonate is heated.
Write a Balanced Equation for the decomposition
CaCO₃ → CaO + CO₂
Find Moles of CO₂ Produced
Since the mole ratio of CaCO₃ to CO₂ is 1 to 1,
the moles of CaCO₃ = moles of CO₂
moles of CaCO₃ = mass ÷ molar mass
= 300 g ÷ 100.087 g/mol
= 2.997 moles
∴ moles of CO₂ = 2.997 moles
Determine Mass of CO₂
Mass = moles × molar mass
= 2.997 mol × 44.01 g/mol
= 131.9 g
∴ when 300 g of calcium carbonate is decomposed, it produces 131.9 g of carbon dioxide.
cho các chất sau NaO2,Na,NaOH,Na2SO4,Na2SO3,NaCl,AgCl hãy lập thành dãy chuyển hoá , hoàn thành bằng phương tình phản ứng
Answer:
brainless me plss i help you out
between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the _____a_____ in water and the _____b_____ of an ethanol molecule.
Answer:
They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
Between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the Oxygen and a Hydrogen in water and the Polar hydrogen of an ethanol molecule.
What is Hydrogen bond ?Hydrogen bonding is an interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons.
It is a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces.
In the given question, They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
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what is the name of the following organic compound? ch3ch2ch2ch2ch2ch2ch2ch3
Answer:
Octane
Explanation:
What is CH3CH2CH2CH2CH2CH2CH2CH3?
Octane - CH3CH2CH2CH2CH2CH2CH2CH3.
The mass number is equal to the number of blank in the nucleus of the atom
Answer:
c
Explanation:
AJUTOR VA ROG AM TEST SI MAI AM 10 MINUTE AM NEVOIE DE SUBPUNCTUL C SI D
Explanation:
desk I have a lot of work and I will send it in the one
what is the wavelength of microwaves if the frequency is 2.45x 10^9 HZ?
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)
= 1.22 × 10⁻¹ m
The wavelength of a light of frequency 2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.
Notes:
Hz ≡ /s
Aluminum is manufactured using electrolysis. Carbon electrodes are used. Describe the nature of the electrolyte.
At which electrode is the aluminum produced?
Answer:
The traditional electrolyte for aluminium electrolysis is based on molten cryolite (Na3AlF6), acting as solvent for the raw material, alumina (Al2O3).Metals are found in ores combined with other elements. Electrolysis can be used to extract a more reactive metal from the ore.
Aluminum can and is used as both anodes and cathodes in electrochemical cells, but there are some peculiarities to using it as an anode in aqueous solutions. As you note, aluminum forms a passivating oxide layer quite readily, even by exposure to atmosphere. In an aqueous solution, if the potential is high enough, OH− and O2− are generated at the anode, which can then react with the aluminum to produce aluminum oxide. Al^3+ can also be generated directly. The electric field will draw the anions through the growing aluminum oxide layer towards the aluminum surface and the Al^3+ towards the solution, making the oxide layer grow both away from the electrode surface and into the surface of the electrode. In this way, coatings thicker than the normal passivation in air can be produced. However, aluminum oxide is a good electrical insulator, thus if a dense non-porous layer is grown, it will become impossible to pass current through it and growth will stop, leaving a relatively thin oxide layer (this is how the dielectric layers in electrolytic capacitors are made). This is the normal behaviour in aqueous solutions at near-neutral pH (5–7).
However, if a thick aluminum oxide layer is desired (e.g. to produce coatings on aluminum parts for dying or durability), maintaining porosity is necessary to avoid completely blocking access to the surface. One technique that is commonly used is using a low pH solution, which tends to redissolve some of the oxide and neutralize some of the formed OH−, leaving pores in the oxide layer through which the ions can travel and continue to react. These pores also give a good structure to retain dyes or lubricants, but generally need to be sealed after to protect against corrosion.
who can write an essay
Answer:
anyone you just have to know how
Explanation:
Two different medical students made models to show their ideas about the molecules that should be in the functioning cells of a healthy body. Using what you have figured out from reading and investigating so far, evaluate the models by answering the questions following the models.
Are these models accurate? choose one)
Medical Student A’s model is accurate.
Medical Student B’s model is accurate.
Both models are accurate.
Neither model is accurate.
Answer:
A
Explanation:
it's a because model is like the same thing as walking on a Runway but it's like a model in the medical field
Which gases are needed for animal and plant respiration? Select two options. FAST ITS TIMED
oxygen
nitrogen
carbon dioxide
neon
carbon
Phản ứng tương tác của ancol tạo thành este được gọi là
Each of these Ionic Compounds are named INCORRECTLY. 1. Find and describe the mistake 2. Correctly name the compound. CaCl2 - Calcium Chlorine CuS - Copper Sulfide Li3P - Trilithium Phosphide CuBr - Copper(II) Bromide NaOH - Sodium Hydrogen Oxide
Explanation:
The nomenclature of ionic compounds is given by:
1. Positive is written first. And if the metal atom has various oxidation states then its oxidation state is to be mentioned in brackets with help of roman numbers
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
1.) : Calcium chloride (Correct)
In the given compound, calcium has oxidation state of +2 and chlorine has oxidation state of -1.The name is correct.
2.) : Copper (II) oxide (Incorrect)
In the given compound,copper has the oxidation state of +1 and oxygen has oxidation state of -2.So ,the correct name will be Copper (I) oxide.
3.) : Lead (II) sulfide (Incorrect)
In the given compound, lead has the oxidation state of +4 and sulfur has oxidation state of -2. So ,the correct name will be Lead (IV) sulfide.
What is igneous rock?
Answer: A) Rock formed by...magma or lava
Explanation:
As the question says, igneous rocks are formed from the cooling and solidification of magma or lava.
just a bit of visual aid thanks to Thoughtco.
Answer:
It is the first one - Rock formed by the cooling and solidification of hot liquid magma or lava.
Explanation:
during which two processes does a substance release energy?
Answer:
Freezing and condensation
Explanation:
Because they are exothermic, they release energy
how many different products are formed from the dehydrohalogenation of 2-bromobutane?
Answer:
3 1-butene, Z-2-butene, and E-2-butene.
Explanation:
Since 2-butene exists as two stereoisomers, three products are possible from the reaction of potassium ethoxide with 2-bromobutane. The products are, of course, 1-butene, Z-2-butene, and E-2-butene.
Can you help me plss.. Answer the guide questions to write a sentence summary for photosynthesis. 1. How do plants make food?
CLUE: 2 raw materials
a. taken in from the roots and surroundings
b. taken in from the air of water
2. What act as helpers in the process? CLUE: 2 photosynthetic enzymes
a. obtained from the sun
b. the green pigment of the leaves 3. What are the two products of photosynthesis?
CLUE:
a. tastes sweet
b. the gas we breath
One:
plants make their own food through a process known as photosynthesis
Two:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy and stored in the form of starch which can be used later
Three:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product.
Answer:
1. b
2. a
3. b
Explanation:
help me plsss yall??????
Answer:
First one answer is physical and other remaning chemical
Answer:
Hydrogen is a colorless, tasteless, and odorless gas.
physical
--------------------------------------------------------------------------------------------------------------
Hydrogen is very combustible in the presence of oxygen.
chemical
--------------------------------------------------------------------------------------------------------------
Hydrogen is very reactive with most elements.
chemical
--------------------------------------------------------------------------------------------------------------
Hydrogen is the least dense of all elements.
physical
The element oregano is most similar to which element in our periodic table
To determine the most similar element identify the atomic number of the element and other properties such as state of the matter, color, conductivity, or boiling point.
In the period table, elements are arranged based on two main factors:
Their atomic number or the number of protons: This means the first element has the lowest atomic number (1) and the last element Ogannesson has the highest atomic number (118).Their properties such as conductivity, boiling point, among others: Elements are organized in sub-groups such as metals, halogens, etc. based on their elements.Now, if you know both the atomic number or the properties you can determine which element is the most similar to the element that you have.
Note: This question is incomplete because there is no information bout the element "oregano"; due to this, I answered it based on general knowledge.
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Bromine is an element that often gains an electron to become a negatively charged ion. Potassium is an element that often loses an electron to become a positively charged ion.
Why are bromine and potassium likely to react with one another?
Bromine needs to gain one more electron to have a noble gas configuration or 8 valence electrons, & potassium needs to lose one so they make a transference of electrons in an ionic bond.
What are the functions of ionic bonding?Ionic bonding is a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities, and is the primary interaction occurring in ionic compounds.
Ionic bonding results in compounds known as ionic, or electrovalent, compounds, which are best exemplified by the compounds formed between nonmetals and the alkali and alkaline-earth metals.
The charge of a cation or anion is denoted as a superscript after the formula of the ion. A + sign denotes a positive charge resulting from loss of electrons. A - sign denotes a negative charge resulting from gain of electrons.
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How many protons does silicon have?
28
2
14
28.08
Answer:
14
Explanation: