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Related Questions
i need help asap plz
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Answer:
Incorrect
Explanation:
Sodium has 11 atoms
Answer:
[tex]incorrect......[/tex]
Use the drop Dow menus to select the names of the labeled structures
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Answer:
theres no picture
Explanation:
candy0993 please answer me
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Answer:
hi this is candy0993
Explanation:
do you need something?
An atom with one electron in its valence
shell will tend to:
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An atom with one electron in its valence shell will tend to lose that electron to achieve the noble gas configuration and becomes a cation.
What is a cation?Cations are positively charged ions and are formed when an atom loses its electrons. They lose one or more electrons from their valence shell but do not lose any protons. Therefore, they get a net positive charge. Some examples of cations are Potassium (K⁺), Calcium (Ca²⁺), and hydrogen (H⁺).
Anions and cations are both ions and have opposite electrical charges. They feel attraction for each other. A cation repels another cation whereas an anion repels another anion.
An atom that has one electron in its valence shell will always tend to lose that electron to get completely filled electronic configuration. So the atom will convert into a cation to attain the more stable noble gas configuration.
For example, sodium has an electronic configuration 1s²2s²2p⁶3s¹. It has one electron in its valence shell, so it converts into Na⁺ by losing one electron and attains a configuration similar to Neon noble gas.
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Which of the following reactions is an example of a single replacement reaction?
Select one:
a. H2 + O2 --> H2O
b. CH4 + O2 --> CO2 + H2O
c. NaI + Br2 --> NaBr + I2
d. H2CO3 --> H2O + CO2
Answers
Answer:
C
Explanation:
Single replacement reactions is when only one element gets replaced / changed. This usually looks like this: A + BC = B + AC or A + BC = C + AB
Therefore, the number of reactants must be equal to the number of products, since no actual combinations / break ups are occurring.
Answers A and D are eliminated right away since the number of products don't equal the number of reactants.
Answer B is wrong because it does not show simply one element being replaced, instead, two compounds are being formed. It doesn't look like the example given.
Only answer C shows that one element is replaced:
The iodine is replaced with bromine to form NaBr + I2
The chemical equation NaI + Br₂ --> NaBr + I₂ is an example of single replacement reaction.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Describe how energy enters AND moves throughout the different trophic levels of an ecosystem
Answers
Answer:
The flow of energy from one trophic level to another creates the energy cycle. In this cycle, energy is neither created nor destroyed. Energy flows from one trophic level to another. The primary source of energy is solar energy. Plants uses solar energy to produce their food by the process of photosynthesis. The food produced by the plants are consumed by the primary consumers. The plan eating animals consume food produced by the plants and they form the second trophic level. In the third tropic level the carnivores get the energy by eating the herbivores. After the death of the carnivores, decomposers act on them and the nutrients are ultimately returned to the soil.
Write down a question about yeast fermentation that can be answered through scientific investigation.
Answers
Explanation:
Alcoholic fermentation converts one mole of glucose into two moles of ethanol and two moles of carbon dioxide, producing two moles of ATP in the process. The overall chemical formula for alcoholic fermentation is: C6H12O6 → 2 C2H5OH + 2CO
Answer:
1. If you leave yeast fermentation out for 3 days what happens?
2. If you put yeast fermentation out in the sun will it still work?
Explanation:
These can be answered through scientific investigation.
:)))))))
A mineral has these 5 characteristics
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Being Inorganic
Being Solid
Crystalline Structure
Definite Chemical Composition
What is the empirical formula of a substance that is 55.4% C, 1.54% H, and 43.1% N by weight?
A) CH₄N₇
B) C₃HN₂
C) C₂H₇N
D) C₄H₁₄N₂
Answers
Answer:
C2H7N
Explanation:
answers to student exploration : stoichometry (GIZMOS) WORTH 100 POINTS AND BRAINLIEST
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What are the coefficients when the chemical equation below is balanced?
___ FeS + ____ O2 = ___ Fe2O3 + ___ SO2
Select one:
a)1, 1, 1, 1
b)4, 6, 1, 2
c)4, 7, 2, 4
d)2, 3, 1, 2
Answers
Answer: c)4, 7, 2, 4
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
The balanced chemical equation will be :
[tex]4FeS+7O_2\rightarrow 2Fe_2O_3+4SO_2[/tex]
The coefficients when the chemical equation below is balanced are 4, 7, 2, 4
Elephants form a circle around a newborn elephant calf.
How does this behavior affect survival of the elephant population?
O A. It increases the chances that the adult elephants will find mates.
O B. It marks the territory so predators stay away from the elephants.
O C. It increases the chances the calf will live to reproduce.
OD. It communicates to the calf the best way to reproduce.
Answers
Answer:
C
Explanation:
Answer:
The answer is C
Explanation:
The older elephants are surrounding the calf to protect it and make sure it lives to reproduce.
Some metals are found as uncombined elements,
but most metals are extracted from ores found in
the Earth's crust. Different metals are extracted
using different methods.
Explain how the method used to obtain a metal is
related to its position in the reactivity series and to
the cost of the extraction process. In your answer,
refer to aluminium, iron and gold as examples.
(6 marks)
Answers
Answer:
no idea
Explanation:
For the balanced equation shown below, if the reaction of 77.0 grams of CaCN2 produces 26.1 grams of NH3, what is the percent yield?
CaCN2+3H2O=>CaCO3+2NH3
Answers
%yield = 86.93%
Further explanationGiven
Reaction
CaCN₂+3H₂O=>CaCO₃+2NH₃
Required
The percent yield
Solution
mol CaCN₂(MW= 92 g/mol) :
= mass : MW
= 77 g : 92 g/mol
= 0.834
From equation, mol NH₃ :
= 2/1 x mol CaCN₂
= 2/1 x 0.834
= 1.668
Mass NH₃(theoretical):
= 1.668 mol x 18 g/mol
= 30.024 g
% yield = (actual/theoretical) x 100%
%yield = (26.1/30.024) x 100%
%yield = 86.93%
The most likely result of completely removing carbon dioxide from the environment of a plant
Answers
Answer:
we will all die bc plants make oxygen and and if we dont have oxygen then we die
Explanation:
A student heats 4g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of the gas?(you’ll get points and get marked as brainleist i think)
Answers
Answer:
1.44 g
Explanation:
We can solve this problem if we keep in mind the law of conservation of mass, which states that if 4 grams of a compound reacted completely, then the sum of the products has to be 4 grams as well.
(Reactants) 4 g = 2.56 g + x g (Products)We solve for x:
x= 4 - 2.56 = 1.44So the answer is 1.44 g.
2C3H7OH + 9O2 --> 6CO2 + 8H2O
Determine the number of grams of CO2 produced from the reaction of 5.55 moles of C3H7OH
Answers
733 g CO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[RxN - Balanced] 2C₃H₇OH + 9O₂ → 6CO₂ + 8H₂O
[Given] 5.55 mol C₃H₇OH
Step 2: Identify Conversions
[RxN] 2 mol C₃H₇OH → 6 CO₂
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of CO₂ - 12.01 + 2(16.00) = 44.01 g/mol
Step 3: Stoichiometry
Set up conversion: [tex]\displaystyle 5.55 \ mol \ C_3H_7OH(\frac{6 \ mol \ CO_2}{2 \ mol \ C_3H_7OH})(\frac{44.01 \ g \ CO_2}{1 \ mol \ CO_2})[/tex]Multiply/Divide: [tex]\displaystyle 732.767 \ g \ CO_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
732.767 g CO₂ ≈ 733 g CO₂
Samira has a son who is 24 months old. Her sister Paulina also has a son who is one and a half years old. Whose son is older? Explain how you know.
Answers
Answer:
the 24 month old
Explanation:
24 divided by the 12 months in a year is 2 and 2 compared to the 1 and a half is bigger
_________ is the movement of materials across a cell membrane using cellular energy.
Passive Transport
Active Transport
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Answer:
active transport
Explanation:
passive transport does not involve energy
What is the density of an object with a mass of 34g and a volume of 13 cm3?
Answers
Answer:
d = 2.62 g/cm³
Explanation:
Given data:
Density of object = ?
Mass of object = 34 g
Volume of object = 13 cm³
Solution:
Density:
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
Formula:
D=m/v
D= density
m=mass
V=volume
By putting values,
d = 34 g/ 13 cm³
d = 2.62 g/cm³
HELP ME QUICKLY!!
Use the portion of the periodic table shown below to answer the questions. (10 points)
A portion of the first three columns of the periodic table is shown. Column one from top to bottom reads 11 sodium 22.990, 19 potassium 39.098, and 37 rubidium 85.468. Column two reads 12 magnesium 24.305, 20 calcium 40.078, and 38 strontium 87.62. Column three reads 21 scandium 44.956 and 39 yttrium 88.906.
Part 1: Name two elements that have the same properties as potassium (K). (4 points)
Part 2: Determine the number of protons, electrons, and neutrons present in an atom of magnesium (Mg). Explain how you determined your answer using complete sentences. (6 points)
Your answer:
Answers
Mg has 12 protons- this is given on the (generally) the top left of the element on the periodic table. We know protons have a positive charge so to make the element neutral there would be 12 electrons to balance the protons. The neutrons is usually the same number as the protons but since the majority of an atoms weight is in protons and neutrons- electrons mass in negligee it’s so small- you can subtract the number of protons from the mass number. In this case : 24-12= 12. So there are 12 neutrons
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Therefore, elements belonging to the same group have same physical and chemical properties.
What is periodic table?Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.
Elements belonging to same column have same physical and chemical properties. 2 elements with same properties as K are rubidium and sodium.
Atomic number of magnesium is 12, means magnesium has 12 electrons, 12 protons. Mass number of Mg is 24. So, to find the number of neutrons we have to subtract 12 from 24, which is 12 neutrons.
Therefore, elements belonging to the same group have same physical and chemical properties.
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Morocco is separated into different territories of land with tribes often fighting for power to this day.
Answers
Answer:
umm whats the question??
Explanation:
What scientist explained the theory of atomic structure by relating it to the planetary model?
Answers
Answer: Rutherford
Explanation:
Which coefficients will balance this equation? *
Ag +
C2 >
AC2
Answers
Answer:
16Ag + 2C2 ---> 4 Ag4C
Explanation:
Ag + C2 ----> AgC2
The valence of Ag is one
Valence of Carbon is four
A balanced equation would be
16Ag + 2C2 ---> 4 Ag4C
In the chemical reaction 2CO(g) + O2 —-> 2CO2 if you react 55.0g of oxygen gas you would expect to produce what volume of carbon dioxide at stp
Answers
Answer:
13mL of CO₂ are produced
Explanation:
Based on the chemical reaction:
2CO(g) + O₂(g) → 2CO₂(g)
Where 1 mole of O₂ in excess of CO produce 2 moles of CO₂}
Thus, to solve this problem we need to convert the mass of oxygen gas to moles and, using the chemical reaction we can find the moles of CO₂ and its volume at STP:
Moles O₂ -Molar mass: 32g/mol-
55g O₂ * (1mol / 32g) = 1.72 moles O₂
Moles CO₂:
1.72 moles O₂ * (2 moles CO₂ / 1mol O₂) = 3.44 moles CO₂
Volume:
PV = nRT
V = P / nRT
Where P is pressure = 1atm at STP
n are moles = 3.44 moles of CO₂
R is gas constant = 0.082atmL/molK
T is absolute temperature = 273.15K at STP
V = 1atm / 3.44mol*0.082atmL/molK*273.15K
V = 0.0130L = 13mL of CO₂ are produced
Por qué el atomismo de balton se le considera un teoría científica mientras que a leucipio y Demócrito no?
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Answer:
Because Democritus or Liucipius cannot demonstrate or proof their ideas as they did not have any equipment or any research to prove the existence of atoms.
Explanation:
John Dalton, Democritus and Leucipius are some of the greatest scientist and scholars of the past.
Democritus originally proposed or gave the idea of the of the composition of the matter of indivisible and tiny particles. John Dalton is credited for the beginning of the modern atomic theory.
Democritus believed that a matter is made up of atoms that can move about empty spaces. They are small, indestructible, solid, indivisible and of different shapes and sizes. Democritus proposed his idea at that time as there were no scientific advancement or instruments to prove his ideas about atoms.
Later on when science and scientific processes were advanced, Dalton was able to prove and proceed on the atomic model theory.
Democritus cannot prove his ideas as there were no instruments or advance scientific processes and so people felt his ideas as illogical. His proposals were based on his ideas.
Anything that has mass and takes up space
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Answer:
true
Explanation:
Answer:
is matter
Explanation:
How many molecules are in one mole of H2SO4
Answers
Answer:
I think it is 20
Explanation:
Answer: 20, Hope this helped!
Explanation:
Mass is a type of property that can be measured using a scale. Is mass considered a physical property or a chemical property? How do you know? It’s not a multiple choice
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Answer:
Mass is an extensive physical property, it depends on the amount of matter being measured. It is physical because it can be measured without changing a substance's chemical identity.
will give brainliest if you answer all of them
Answers
Answer:
Explanation:
A. Graphite can conduct electricity because of the delocalised (free) electrons in its structure. These arise because each carbon atom is only bonded to 3 other carbon atoms. ... However, in diamond, all 4 outer electrons on each carbon atom are used in covalent bonding, so there are no delocalised electrons.
B. Diamond is hard because the carbon atoms in diamond are bonded in a stronger tetrahedron pattern but graphite is soft and slippery because the carbon atoms in graphite are bonded in layers with only weak vanderwall force holding the layers together.