Answer:
1 × 10²⁴ atoms O
General Formulas and Concepts:
Chemistry - Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:
Step 1: Define
30 g O
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of O - 16.00 g/mol
Step 3: Convert
[tex]30 \ g \ O(\frac{1 \ mol \ O}{16.00 \ g \ O} )(\frac{6.022 \cdot 10^{23} \ atoms \ O}{1 \ mol \ O} )[/tex] = 1.12913 × 10²⁴ atoms O
Step 4: Check
We are given 1 sig fig. Follow sig fig rules and round.
1.12913 × 10²⁴ atoms O ≈ 1 × 10²⁴ atoms O
What explanation from the evidence within the chemical equation BEST supports the idea that matter is conserved in a chemical reaction? A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products. B There are the same number of elements in the reactants as there are in the products. C More reactants, hydrogen and oxygen, were added to make the product, water. D Two reactants, hydrogen and oxygen, combined to make one product, water.
Answer:
A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.
Explanation:
Matter is conserved in a chemical equation if there are no loss of atoms. That means, total number of atoms of elements must be the same as the total number of element on the product side. The correct option is;
A. There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.
Answer:
its A. i just did dat
A student collects the following data to determine the density of a metal cube. What is the correct density ( including absolute uncertainty)? Pls Help me with this questions!!!!!!
Mass of metal Length of Metal Height of Metal Width of Metal
4.56 +/- 0.05g 1.54 +/- 0.05cm. 6.24 +/- 0.05cm. 1.00 +/- 0.05cm
The density of the metal including absolute uncertainty is ρ = 0.48 g/cm³ ± 0.03 g/cm³
How to find the correct density of the material?The density of the material is the mass/volume
Since the metal has
mass m = 4.56 ± 0.05g, length, l = 1.54 ± 0.05cm, height, h = 6.24 ± 0.05cm and width, w = 1.00 ± 0.05cmIts density = m/v where
m = mass and v = volume = lwhρ = m/lwh
ρ = 4.56 g/(1.54 cm × 6.24 cm × 1.00 cm)
ρ = 4.56 g/9.6096 cm³
ρ = 0.475 g/cm³
ρ = 0.48 g/cm³
To find the absolute uncertainty in density, we first find the relative uncertainty which is given by
Δρ/ρ = √[(Δm/m)² + (Δl/l)² + (Δh/h)² + (Δw/w)²] where
Δm = ± 0.05 gm = 4.56 gΔl = ± 0.05 cml = 1.54 mΔh = ± 0.05 cmh = 6.24 cmΔw = ± 0.05 cmw = 1.00 cmSubstituting the values of the variables into the equation, we have
Δρ/ρ = √[(Δm/m)² + (Δl/l)² + (Δh/h)² + (Δw/w)²]
Δρ/ρ = √[(0.05 g/4.56 g)² + (0.05 cm/1.54 cm)² + (0.05 cm/6.24 cm)² + (0.05 cm/1.00 cm)²]
Δρ/ρ = √[(0.010965)² + (0.032468)² + (0.008013)² + (0.05)²]
Δρ/ρ = √[0.00012023 + 0.00105417 + 0.00006421 + 0.0025]
Δρ/ρ = √0.00373861
Δρ/ρ = ± 0.061
Δρ/ρ ≅ ±0.06
So, the absolute uncertainty in density, Δρ = Δρ/ρ × ρ
= ±0.06 × 0.48 g/cm³
= ± 0.029 g/cm³
≅ ± 0.03 g/cm³
So, the density of the metal including absolute uncertainty is ρ = 0.48 g/cm³ ± 0.03 g/cm³
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b. onsia, t. conard, s. de gendt, m. heyns, i. hoflijk, p. mertens, m. meuris, g. raskin, s. sioncke, i. teerlinck, a. theuwis, j. van steenbergen, c. vinckier, "a study of the influence of typical wet chemical treatments on the germanium wafer surface," solid state phenom. 103-104, 19-22 (2005)
The influence of various wet chemical treatments on the germanium wafer surface has been examined. The GeO2 part of the native oxide is readily dissolved in water. The solubility of the GeO2 in aqueous solutions and the fast oxidation of germanium makes commonly used silicon treatments nonapplicable due to the relatively high etch rates. In various etching chemistries, the underlying suboxide is not attacked. A hydroxylated suboxide might be an ideal starting surface for ALD, because of its low contribution to electrical thickness. HBr removes even the suboxide and yields a completely oxide-free germanium surface which makes it a candidate surface preparation technique for epitaxial growth. The same result is obtained using a HI dip followed by a DIW rinse. Oxide is growing in CR-air, while in N 2 ambient the surface remains stable.
An oxide is a category of chemical compound that has one or more oxygen atoms as well as another element in its composition such as Li2O, CO2, H2O, etc.
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How many significant figures in 0.4004 ml
four
Explanation:
four significant figures in 0.4004 ml
So weird question kind of, not sure how to phrase this; but in the periodic table, the groups are labeled 1 through 18, however, the most amount of valence electrons an element can have is 8, so why are they labeled 1 through 18? What do those numbers stand for?
The elements are placed in groups and periods on the contemporary periodic table, according to this definition. The elements are organized in the current periodic table in order of increasing atomic number. This periodic table has 7 periods and 18 groupings. Horizontal rows form the arrangement of the periods.
What is a periodic table?Chemistry is the branch of science that examines the characteristics, make-up, and structure of substances (specified as elements and compounds), as well as the changes they go through and the energy released or absorbed. Every substance, whether created through natural processes or through man made means, is made up of one or more of the roughly a hundred types of atoms that have been classified as elements.
According to the question, groups are :
Groups refers to the vertical rows.The periodic table has a total of 18 groupings.The distinction between the groups is made on the basis of valence electron count and degree of reactivity.All elements in the same group of elements have the same chemical behavior for their outermost electrons.To get more information about Periodic Table :
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determine the number of protons neutrons and electrons in 3216s2
Answer:
Number of protons = 16
Number of neutrons = 16
Number of electrons = 18
Explanation:
The atom given is (32,16)S_2.
This simply Sulphur atom.
What (32,16)S_2 implies is that;
Atomic number = 16
Mass number = 32
Now atomic number means number of protons present in the atom
While mass number means number of sum of protons and neutrons present in the atom
Thus;
Number of protons = 16
Number of neutrons = 32 - 16 = 16
Now, for a neutral atom, number of protons is equal to number of electrons.
However, in this case it's not neutral but has a charge of -2.
Thus,
Number of electrons = 16 + 2 = 18 electrons
why elements are arranged according to atomic number rather than atomic mass in the periodic table
Answer:
hope it helps...
Explanation:
Atomic Number as the Basis for the Periodic Law
Assuming there were errors in atomic masses, Mendeleev placed certain elements not in order of increasing atomic mass so that they could fit into the proper groups (similar elements have similar properties) of his periodic table.
when a person wearing perfume enters the room it takes several minutes to reach at the back of the room explain
Perfume molecules are in constant random motion
When a person wearing perfume enters the room it takes several minute for a smell to reach at the back of the room because the perfume molecules are in constant random motion they bump into each other causing some molecules to be occasionally sent hurtling out of the mass the perfume is sprayed in corner of a room, it will be smelt soon after in the opposite corner and also the process called as diffusion means it travel the area of high concentration to low concentration that's why perfume molecules are in constant random motion that's why it take several minutes to reach at the back of the room
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to save time you can approximate the initial volume of water to ±1 ml and the initial mass of the solid to ±1 g . for example, if you are asked to add 23 ml of water, add between 22 ml and 24 ml . which metals in each of the following sets will have equal density?
The metals in the following set which will have equal density are:
20.2 g of silver when placed in 21.6 mL of water and 12.0 g of silver when placed in 21.6 mL of water.15.2 g of copper when placed in 21.6 mL of water and 50.0 g of copper when placed in 23.4 mL of water.11.2 g of gold when placed in 21.6 mL of water and 14.9 g of gold when placed in 23.4 mL of waterSo, the correct options are 2,3 and 6.
A substance or object's density can be found out by comparing its mass to volume. Density is calculated using the formula:
[tex]density = \frac{mass}{volume}[/tex]
It is an essential property that the density of the same material remains constant at varied masses and volumes. Since the metal used in both situations is the same and metal has a fixed value of density, the choice with sets of the same metals has equal densities across the possibilities provided.
The complete question is as follows:
To save time you can approximate the initial volume of water to ±1 mL and the initial mass of the solid to ±1 g. For example, if you are asked to add 23 mL of water, add between 22 mL and 24 mL. Which metals in each of the following sets will have equal density?
1. 20.2 g gold placed in 21.6 mL of water and 12.0 g copper placed in 21.6 mL of water.
2. 20.2 g silver placed in 21.6 mL of water and 12.0 g silver placed in 21.6 mL of water.
3. 15.2 g copper placed in 21.6 mL of water and 50.0 g copper placed in 23.4 mL of water.
4. 15.4 g gold placed in 20.0 mL of water and 15.7 g silver placed in 20.0 mL of water.
5. 20.2 g silver placed in 21.6 mL of water and 20.2 g copper placed in 21.6 mL of water.
6. 11.2 g gold placed in 21.6 mL of water and 14.9 g gold placed in 23.4 mL of water.
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What makes the Bactria move
Answer:
b
Explanation:
why law of conservation of mass should better be called as law of conservation of mass and energy
Answer:
Energy can neither be created not be destroyed
Mass too can neither be created nor be destroyed
Both of them remain conserved during any chemical or physical reaction
Some part of them gets transformed to undesired useless form
Hence law of conservation of mass should better be called the law of conservation of mass and energy
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what type of friction is talking
Answer:
does friction talks ? friction is a oppossing force tho
gypsum.
a.
The sedimentary rock formed when water deposits tiny particles of clay in very thin, flat layers is called
gypsum.
b. shale.
limestone.
d. calcite.
C.
Answer:
b shale
Explanation:
What is the work done on an object moves a distance of 6.3 m with a force of 8.5 times 10 to the third power Newtons?
Answer:
5.355 × 10³ JExplanation:
The work done by an object can be found by using the formula
workdone = force × distance
From the question we have
workdone = 8.5 × 10³ × 10
We have the final answer as
5.355 × 10³ JHope this helps you
A chemical reaction is the only way to separate a(n) ________
Answer:
B. pure substance
Explanation:
A chemical reaction is the only way to separate a(n) ✔ pure substance.
I'm pretty sure I picked the right answer but on the question I found, it had multiple responses of different answers, so please help.
Answer:
Plastics are large organic molecules called polymers.
Explanation:
Plastics can be defined as materials that can be shaped when soft and then hardened to keep their shape. They are synthetic (artificially made) or semi-synthetic, derived from materials found in nature, such as natural gas, oil, coal, minerals, and plants.
As they are derived from natural, organic materials, plastics also consist of organic molecules. Their molecules are very large and long and consist of many repeating subunits. Materials with this type of structure are called polymers.
This is why the second option is the correct one.
How do muscles create heat?
Question 5
Which element has the oxidation number of +1 ?
Chlorine (CI)
Nitrogen (N)
Potassium (K)
Boron (B)
plz help
Answer:
Potassium (K)
Explanation:
The element with oxidation number of +1 is potassium.
Every element in the first group on the periodic table has an oxidation number of +1.
They are a group of metals known as the alkali metals. When they combine with other atoms, they prefer to lose an electron to form the bonds. A loss of an electron will give them a complete octet in their atomic structure.A student studies photosynthesis and cellular respiration in plants. Which of the following reactions would produce 12 grams (g) of glucose and oxygen?
when a total of 12g of carbon dioxide and water react in photosynthesis
when a total of 24g of carbon dioxide and water react in photosynthesis
when a total of 12g of carbon dioxide and water react in cellular respiration
when a total of 24g of carbon dioxide and water react in cellular respiration
Answer:
The answer is A
Explanation:
Because I used the elimination rule none of the other ones could be an answer.
When a total of 12g of carbon dioxide and water react in photosynthesis would produce 12 grams (g) of glucose and oxygen. Therefore, option (A) is correct.
What is photosynthesis?Photosynthesis can be described as the process that takes place in plants through photosynthetic pigments such as chlorophyll. All green plants have a photosynthesis process to produce glucose by using water, carbon dioxide, and sunlight. The side product of this process in plants is oxygen.
The photosynthesis process is also utilized by algae to change solar energy into chemical energy. Photosynthesis takes place when plants utilize sunlight to change carbon dioxide and water into glucose and oxygen.
The Chemical equation of photosynthesis in plants is:
6CO₂ + 6 H₂O → C₆H₁₂O₆ + 6O₂
For a balanced chemical reaction, the total mass of the reactant is equal to the total mass of the products, so if the 12 g of carbon dioxide and water react with each other then 12 g of glucose and oxygen will be produced.
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How are masses and volumes of the objects related to their densities?
Answer:
please mark me brainliest :D
Explanation:
Knowing the mass and volume of an object allows the calculation of its density. Density is defined as the mass divided by the volume of the object. The general physical law relating to floating objects is known as Archimedes' Principle.
The three most fundamental characteristics of an object are mass, volume, and density. Volume indicates something's size, mass indicates how heavy it is, and density is calculated as mass divided by volume.
Mass divided by volume is how density is calculated. It is clear that the relationship between density and volume is inverse. This implies that the density will decrease if the mass of a body remains constant while its volume rises. In contrast, if the volume decreases, density will rise while the mass stays the same.
If the mass or volume of an object is altered, the density of the thing may also change. Water, for example, has a specific density.
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based on their lewis dot diagram, which of the following elements is a metal
Answer:
Explanation:
b
The second answer option shows a metal element.
We can arrive at this answer because:
The Lewis dot diagram is used to demonstrate the electrons in the valence layer of the elements.This diagram is made with the symbol of the element surrounded by dots that represent the number of electrons in its valence layer.Metals have one or two electrons in the valence layer, in which case, in the Lewis point diagram, metal would be represented with one or two points around the element symbol.
Among the answer options shown in the question above, the second option is the only one that represents a metal.
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In the current periodic table, how are the elements arranged?
a. the bonding power with oxygen
b. the number of neutrons
c. atomic mass
d. atomic number
Answer:
The answer would be
C. The number of neutrons
You're welcome <3
"What product of the reaction of methane has an impact on the environment?"
A. CO2
B. 2H20
C. Energy
Explanation:
When methane is burnt with oxygen,like all hydrocarbons,it produces CO2 and H20.
CO2 is a greenhouse gas which means it leads to global warming.
Answer:
Carbon dioxide (CO2) is a product of the reaction of methane with oxygen.
Explanation:
Carbon dioxide is a known cause of climate change, which has a negative effect on the environment.
Select the answer with the correct number of significant figures for each calculation. 31.580 + 4.26 = 35.8 35.84 35.840
Answer:
35.8.540 its korrect now
when a student adds 30.0mL of 1.00M HCl to 0.56g of powdered Fe, a reaction occurs according to the equation above. When the reaction is complete at 273K and 1.0 atm, which of the following is true?
A) HCl is in excess, and 0.100 mol of HCl remains unreacted
B) HCl is in excess, and 0.020 mol of HCl remains unreacted
C) 0.015 mol of FeCl2 has been produced
D) 0.22L of H2 has been produced
Answer:
Explanation:
Sup Wayne I need this answer too.
Answer: 0.22 L of H2 has been produced
Explanation:
How are the crust and the inner core ALIKE?
A) They are both solid
B) They both have the same temperature
C) They are both under the same pressure
D) They are both very close to the center of the earth
Answer:
A) They are both solid.
explain why diamond has a high melting point
Answer:
Each carbon atom is covalently bonded to 4 other carbon atoms in diamond. A large amount of energy is required to split these atoms apart. This is because of the fact that covalent bonds are strong.
In diamond 4 carbon atoms are strongly bonded with covalent bond and they form giant covalent structure which requires large amount of energy to break down, that’s why diamond has a high melting point. It does not conduct electricity.
How many orbitals would mercury (Hg) have?
Answer:
6 orbitals
Explanation:
An atom of mercury will have 6 - orbitals because it can be found on the 6-period in the periodic table of elements.
Orbitals or shells are energy levels in which electrons are placed within an atom.
Let us write the shell notation of the element:
Hg has 80 electrons:
K L M N O P
2 8 18 32 18 2
So, we have six orbitals
Mercury has a density of 13.534 g/mL. The Department has a 385 mL container of mercury. What is the mass of the mercury in the container in grams?
Answer:
5210.59 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 13.534 × 385
We have the final answer as
5210.59 gHope this helps you
I WILL GIVE BRANLIEST IF CORRECT!!!!
Answer:
Uranium producess thorium and alpha particle
Explanation: