Answers
Answer:
D. Selenium
Explanation:
If you are talking about elements with a neutral charge, i.e. just usual elements and not ions whatsoever, then we have five elements who match the criteria. They are oxygen (o) sulfur (s) selenium (se) tellurium ( T e ) polonium ( P o )
Related Questions
Sulphuric acid (H2SO4) is extremely corrosive to skin. Which branch of chemistry is this?
1) Analytical Chemistry
2) Bio Chemistry
3) Environmental Chemistry
4) Inorganic Chemistry
Answers
Answer:
B
Explanation:
Bio Chemistry.
350.0-mL of 0.50 M hydrogen sulfate solution is reacted with 15.0 grams of sodium hydroxide. What volume of water will be produced?
Answers
The volume of water that will be produced from the reaction will be 6.3 mL
Stoichiometric calculationFrom the equation of the reaction:
[tex]H_2SO_4 + 2NaOH --- > Na_2SO_4 + 2H_2O[/tex]
The mole ratio of hydrogen sulfate to sodium hydroxide is 1:2.
Mole of hydrogen sulfate = 0.50 x 350/1000 = 0.175 moles
Mole of 15 grams sodium hydroxide = 15/40 = 0.375 moles
Thus, hydrogen sulfide is the limiting reagent.
Mole ratio of hydrogen sulfide to water = 1:2.
Equivalent mole of water = 0.175 x 2 = 0.35 moles
Mass of 0.35 moles of water = 0.35 x 18 = 6.3 grams.
1 gram of water = 1 ml.
Thus, 6.3 grams of water will be equivalent to 6.3 mL
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If ba+2 will reacts with n-3, the formula of the compound formed is:
a. ban3
b. ba2n3
c. ban
d. ba3n2
Answers
If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].
What is an ionic compound?Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions.
Barium is a metal element and Nitrogen is a non-metal element, so they form an ionic compound. To make the formula of an ionic compound, first, we need to see the valence of the atoms, that is, how many electrons it can donate or it has to gain to have 8 electrons in the valence layer (octet rule).
Barium is in family 2, so it has two electrons in its valence layer, so it must donate these two electrons; Nitrogen is in family 15, so it has 5 electrons ins its valence layer and must gain 3 electrons.
Writing the ions they must form:
[tex]Ba^{+2}N^{-3}[/tex]
First came the cation (positive charge), then the anion (negative charge), and the charges must change between them, without the signal, and will inform how many atoms are necessary for which element:
[tex]Ba_3N_2[/tex]
Hence, If [tex]Ba^{+2}[/tex] will reacts with [tex]N^{-3}[/tex], the formula of the compound formed is [tex]Ba_3N_2[/tex].
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When calculating specific heat, what does the variable 'Q'
represent?
A. Mass
B. Specific heat capacity
C. Latent heat
D. Thermal energy
Answers
Answer:
D.) Thermal energy
Explanation:
I got it correct on founders edtell
People in the southern united states imported the plant kudzu from japan to control erosion along highways kudzu now spreads so quickly that it kills many
other plants. how have humans directly impacted the environment in this example?
a introduction of a non-native species
b destruction of habitat
c disruption of a food chain
d. overexploitation
Answers
Humans directly impacted the environment by destroying of the habitat of the other plants. Hence, option B is correct.
What is Kudzu plant?Kudzu vine is known as a fast-growing plant since the '30s and 40's when the Soil Conservation Service paid about 8$ to every farmer who can plant an acre with this plant.
Kudzu overgrows and crowds out native plant population, for sunlight and nutrients. Therefore, it's considered 'invasive'.
It grows so quickly that it cannot be controlled and disturb other habitats of plants. Hence, option B is correct.
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The substances sodium (Na), oxygen (O2), and sodium oxide (Na2O) participate in this chemical reaction:
4Na + O2 → 2Na2O.
Which statement best describes the reaction?
Answers
The chemical reaction involving sodium and oxygen as given in the reaction: 4Na + O2 → 2Na2O is a synthesis reaction.
What are chemical reactions?Chemical reactions are changes which occur in the chemical composition of atoms of substances which results in the formation of new substances.
There are different types of chemical reactions such as:
synthesis reactiondisplacement reactiondouble displacement reactionsA synthesis reaction is a reaction in which two or more substances combine to form a new product.
Therefore, the chemical reaction involving sodium and oxygen as given in the reaction: 4Na + O2 → 2Na2O is a synthesis reaction.
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If you have 100 ml of water mixed with 100 ml of pollutant, the concentration of pollutant is
Answers
The concentration of pollutants is equal to the concentration of water.
What is concentration?The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
The concentration of water is 100 ml and the concentration of pollutants is 100 ml .
Hence, If you have 100 ml of water mixed with 100 ml of pollutant, the concentration of pollutant is equal to water.
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how many moles of pb(NO3)2 are needed to react with 4.8 moles of Al
Answers
groundwater is an important resource for all life on earth. as you have read, water levels in the ogallala aquifer are decreasing. one proposed
strategy mentioned in the article is to dig deeper wells. do you agree or disagree with this strategy? use evidence and scientific reasoning to
support your position
Answers
Digging of wells being able to increase aquifer is something I agree with.
What is an Aquifer?
This is a water permeable rock layer which is found in the underground layer of the earth.
Wells will ensure water seeps into these layers thereby bringing about an increase in the aquifer.
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What always occurs during a nuclear fission reaction?.
Answers
The conductance of the electric current through the electrolytic solution increases with
a)decrease in dilution
b)increase in dilution
c)increase in concentration
d)low degree of ionization
Answers
The conductance of the electric current through the electrolytic solution increases with increase in concentration.
What is an electrolytic solution?An electrolytic solution is a solution containing dissolved electrolyte.
The ions of the electrolyte dissociate and are able to carry electric current around the electrolytic cell.
The higher the concentration of the electrolyte, the more electric current it can conduct due to greater number of ions present.
Therefore, the conductance of the electric current through the electrolytic solution increases with increase in concentration.
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An atom has eight protons and nine neutrons. draw the atomic structure of the atom
Answers
draw eight electrons (since electrons = protons in neutral elements) outside of it (2 in one ring, then 6 in a second ring)
An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.
What is an atomic structure ?The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.
The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.
An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.
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How many moles of a gas are contained in 2.085 L at STP?
A. 0.0931 mol
B. 10.8 mol
C. 10.3 mol
D. 1.11 mol
Answers
A.0.0931 mol
from ideal gas equation ,
We have ,
PV = nRT
Where P stands where pressure of gas.
We know that pressure of gas at STP = 1 atm
V stands for volume of gas , given Volume is 2.085 L
R stands for gas constant , R = 0.0821
And T stands for absolute temperature and measured in kelvin,T=273K
Now ,
PV = nRT
n = PV/RT
Refer attachment for working
Water is made of polar molecules, and oil is made of nonpolar molecules. Based on your observations, which molecules attract each other more strongly, polar molecules or nonpolar molecules? Explain your reasoning.
Answers
Based on observation of polar and non-polar molecules, polar molecules would attract each other more strongly.
What are polar and non-polar molecules?Polar molecules are those molecules that can ionize or dissociate into their respective positive and negative ions when in an aqueous solution.
Nonpolar molecules, on the other hand, are not ionic i.e. not dissociating into ions when dissolved in water.
Polar molecules like water (H2O) contains an uneven distribution of cations (+) and anions (-), hence, would be more attracted to one another than nonpolar molecules that have an even distribution of ions.
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The diagram below shows the geometric structure of the molecule of water H2O what do the symbols (the bigger gray circle) and (the smaller black circle) represent in the model?
1) genetic material
2) cells
3) chemical bonds
4) atoms
Answers
Answer:
Chemical bonds
Explanation:
Because it has an image of atoms being held together by chemical bonds.
A 57.6 g sample of methane (CH4) is found to contain 43.2 g of carbon. What is the
percent composition of Carbon and Hydrogen? How much hydrogen (in grams) would a
37.8 g sample of methane contain?
Answers
Answer:
Explanation:
The atomic mass of carbon is 12.011 g/mol.The atomic mass of hydrogen is 1.00794 g/mol.This means that the atomic mass of methane is 12.011+4(1.00794)=16.04276 g/mol.
The percent composition by mass of carbon is [tex]\frac{12.011}{16.04276} \times 100=\boxed{74.9\%}[/tex]The percent composition by mass of hydrogen is [tex]\frac{4(1.00794)}{16.04276} \times 100=\boxed{25.1\%}[/tex]This means that in a 37.8-gram sample of methane, there would be [tex](37.8)\left(\frac{25.1}{100} \right)=\boxed{9.49}[/tex] grams of hydrogen.
Saturn has a diameter of 74,898 miles. What is its diameter in kilometers? (1
mile = 1.6 kilometers)
Answers
Answer:
119836.8 km
Explanation:
74 898 miles * 1.6 km / mile = 119836.8 km
Based on Figure 2, which statement best describes what happens to the amount of matter in the reaction?
A. There are 54 atoms in the reactants and 54 atoms in the products.
B. There are 15 reactants molecules that become the 15 product atoms.
C. The 15 reactants molecules are destroyed to produce energy in the form of energy
D. The fuel molecule is broken in half and each half makes molecules of water and carbon dioxide as products.
Answers
Answer:15 +18
Explanation:15 fuel +18 oxygen + 33 cd
G.P.E. on Earth is determined by an object's _______and _______
Answers
Answer:
mass and height of the object.
Activity 1: "PEA-ce of Cake"
OBJECTIVE: Identify the genotypic and phenotypic ratios of offspring in the standard monohybrid cross.
Parent 1: _______________
Garden pea plant with homozygous gene pair for round seed
Garden pea plant with homozygous gene pair for wrinkled seed
Genotype (Parent 1): _______________
RR
rr
Parent 2: _______________
Garden pea plant with homozygous gene pair for round seed
Garden pea plant with heterozygous gene pair for round seed
Genotype (Parent 2): _______________
RR
Rr
Answers
The genotype and phenotype ratio for the first cross will be 100% Rr and 100% round seeded while that of the second cross will be 1RR:1Rr and 50/50 round/wrinkle seeded offspring respectively.
Genotype and phenotype ratioFor the first cross:
RR x rr
Rr Rr Rr Rr
Genotype ratio: 100% Rr
Phenotype ratio - 100% round seeded
For the second cross:
RR x Rr
RR Rr RR Rr
Genotype ratio: 1RR:1Rr
Phenotype ratio = 50% round seeded and 50% wrinkle seeded.
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Which electrochemical cell does the illustration depict
Answers
Answer:
This depicts an electrolytic cell.
PLEASE HELP! WILL GIVE BRAINLIEST:
A gas has a volume of 62.65 L at STP. At what temperature (in oC) would the volume of the gas be 78.31 L at a pressure of 612.0 mm Hg?
Please show the work <3
Answers
2.45 °C
From the Ideal gas law (Combined gas law)
PV/T = P'V'/T' .....eq 1
Where:
P - initial pressure
V - initial volume
T - initial temperature
P' - final pressure
V' - final volume
T' - final temperature.
To proceed we have to make T the subject from eq.1
Which is, T = P'V'T/PV.......eq.2
We have been provided with;
Standard temperature and pressure (STP)
P = 760 mm Hg (SP - Standard Pressure)
T = 273.15 K (ST - Standard Temperature)
V = 62.65 L
P' = 612.0 mm Hg
V' = 78.31 L
T' = ? (what we require)
Therefore, we substitute the values into eq.2
T' =
.
T' = 275.60 K
T = (275.60 - 273.15) ......To °C
T = 2.45 °C
>>>>> Answer
Have a nice studies.
Select the correct answer.
a sample of an element was poured from one container into a second container. it took on the shape of the second container. it was then
cooled. after cooling, the element was removed from the container and kept its new shape. what happened to the atoms of the element wt
they were cooled in the second container?
oa. they began to escape into the air.
ob. they stopped being attracted to nearby atoms.
oc. they stopped moving past the atoms around them.
od. they began to move more quickly.
Answers
A pinch of salt has
approximately 3.29x1021 formula units of NaCl. How
many moles of NaCl are in a pinch of salt?
Answers
13.29 X [tex]10^{21}[/tex] moles of NaCl are in a pinch of salt and a pinch of salt has
approximately 3.29x[tex]10^{21}[/tex] formula units of NaCl.
What are moles?The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12; its symbol is “mol”.
We know that 1 formula unit of sodium chloride has a molar mass of 58.44g/mol
Hence;
Mass of 1 formula unit = 58.44g
Mass of 3.29 x [tex]10^{21}[/tex] formula units
13.29 x [tex]10^{21}[/tex] x 58.44g
776.6676 x [tex]10^{21}[/tex]
Moles =[tex]\frac{776.6676 X 10^{21} }{ 58.44g}[/tex]
Moles = 13.29 X [tex]10^{21}[/tex]
Therefore;
13.29 X [tex]10^{21}[/tex] moles of NaCl are in a pinch of salt.
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NEED ASAP PLS WILL AWARD BRAINLIEST
The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
X 6 12
Y 7 13
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
Atom X and Atom Y are in the same row, but not the same family, on the periodic table.
Atoms X and Atom Y are in the same family, but not the same row, in the periodic table.
Atom X is in a column to the right of Atom Y in the periodic table.
Atom X and Atom Y occupy the same position in the periodic table because they are isotopes.
Answers
Answer:
proton number for element X is 6
while proton number for element Y is 7
X and Y are in the same row but not the same family on the periodic table cause element X belongs to group 6 also known as carbon family while Y belongs to group 7 also known as nitrogen family
what are the advantages of wind energy/fuel?
have complete details and also add the disadvantages
Answers
Answer:
Advantages of Wind Energy -
Free , clean , unlimited fuel . One of the Cleanest Forms of Energy · Advances in Technology · Doesn't Disrupt Farmland Operations ·5) Reduces Our Dependence of Fossil FuelsDisadvantages of Wind Energy-
Dangerous to Some Wildlife NoisyExpensive Upfront CostUnreliable/Unpredictablehttps://justenergy.com/blog/wind-energy-pros-and-cons/
hope this site might help you with the details
When energy decreases what happens to particle motion?
Answers
Answer:
When a substance is cooled, its internal energy decreases: the movement of its particles decreases. bonds between particles form when a substance condenses or freezes, or sublimes to form a solid from a gas. What is called energy? Energy is the capacity of a physical system to do work.
Explanation:
which compund do not exist in independant molecular form
Answers
Answer:
Ionic compounds do not exist in independent molecular form
-Lexi
Below is the thermochemical equation for the combustion of octane.
SC8H18(l) + 25O2(g) ⇒ 16CO2 (g) + 18H2O(l), ΔH= -10,941kj
How much heat is released during the combustion of 4 moles of octane (C8H18)
Question 5 options:
-21,882 kJ
-175,056 kJ
-2,735 kJ
-10,941 kJ
Impossible to answer this question with the information provided
-5,470.5 kJ
Answers
5mol produces -10.941KJ
4 mol let produces x KJ
Solve through proportion
5/-10.941=4/x5x=-43.764x=-43.764/5x=8.756 KJ5moles of octane produces -10941KJ
1mol of octane produces 2188KJ
4mol of octane produces
2188(4)8756KJAn automobile gasoline tank holds 25.0 gal when full. how many pounds of gasoline will it hold if the gasoline has a density of 0.737 g/ml ?
Answers
The amount (in pounds) the gasoline tank will hold when full is 153.76 lb
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to convert gallon to milliliters1 gallon = 3785.412 mL
Therefore,
25 gallon = 25 × 3785.412
25 gallon = 94635.3 mL
How to determine the mass Density = 0.737 g/mLVolume = 94635.3 mLMass =?Mass = Density × Volume
Mass = 0.737 × 94635.3
Mass = 69746.2161 g
How to convert grams to pounds453.592 g = 1 lb
Therefore,
69746.2161 g = 69746.2161 / 453.592
69746.2161 g = 153.76 lb
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