Answer:
Xenon
Explanation:
The reason is because, Xenon is a part of a Group on the periodic table called Noble Gases. This means that it has 8 electrons on its outer shell, making it very hard to get a reaction out of it.
How does heat transfer work?
Answer:
Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules
Explanation:
Which best describes a compound such as magnesium oxide? an impure substance that is made up of two elements a mixture of two uncommon substances a mixture of two common elements a pure substance that is made up of different elements
Answer:
A pure substance that is made up of different elements
Explanation:
Answer:
D. a pure substance that is made up of different elements
Explanation:
Step-by-step explanation:
There are two types of pure substances: elements and compounds.
Elements are made up of only one type of atom. And compounds are pure substances, that are made up of more than one type of element. Like - magnesium oxide. It is a compound of a metal with a non-metal and is held together with ionic bonds.
How does blood flow from a person's leg back to the person's heart?
A Gravity pushes the blood upward.
B Lungs pull the blood upward.
C Contracting leg muscles push the blood upward.
D Contracting heart muscles pull the blood upward.
Determine the identity of a sample of gas at STP conditions, with a mass of 120.00 grams that occupies 67.2 L.
a) N2
b) Ar
c) He
d) Ne
explain your answer
Answer:
b) Ar
Explanation:
Given data:
Mass of sample gas = 120.00 g
Volume of gas = 67.2 L
Identity of gas = ?
Solution:
We will calculate the molar mass do identify the sample:
Number of moles of gas:
PV = nRT
1 atm×67.2 L = n×0.0821 atm.L/mol.K×273 K
67.2 atm.L = n × 22.42atm.L/mol
n = 67.2 atm.L / 22.42atm.L/mol
n = 3 mol
Molar mass of gas:
Number of moles = mass/molar mass
Molar mass = 120.00 g/3 mol
Molar mass = 40 g/mol
The given sample of a gas is Ar.
Can someone please help me
Is Aushtin dating Summer please help
Answer:
uhm yes he made her pump go off
Explanation:
Explain how fossil fuels are formed from living organisms on land and in the sea.
Answer:
Depending on the ambient conditions, oil or natural gas develops. Today’s sources of fossil fuels are between 15 and 600 million years old. During this period the continental plates shifted, transforming oceans into landmasses, with the result that mineral deposits can be found both on land and at sea.
Explanation:
Define covalent bond.
What happens to ions during bonding to form an ionic compound? O Cations accept electrons and anions give away electrons. O Anions and cations share electrons. O Cations give away electrons and anions accept those electrons.
Answer:
Last one: Cations give away electrons and anions accept those electrons.
Explanation:
Just did it
Answer:
D
Explanation:
"Cations give away electrons and anions accept those electrons."
If you wanted to take a solid nugget of silver and make it flow so that it can be shaped, how could you do it? you could...
Answer:
It should be heated
Explanation:
To change the solid nugget of silver to liquid so that it can be shaped, the solid mass should be heated to the melting point.
This change is a phase change from solid to liquidWhen the melting point of a substance is reached, the fixed lattice structure collapses. This allows for the particles to slide and flow relative to one another.Therefore a phase change from solid to liquid is attained by heating of the solid to melting point.
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type?
Al + Fe3O4→ Al2O3 + Fe
The balanced equation :
8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe
You just have to look for which element is in bold because the question is not clear
Further explanationEqualization of chemical reaction equations can be done using variables. Steps in equalizing the reaction equation:
1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c etc.
2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product
3. Select the coefficient of the substance with the most complex chemical formula equal to 1
Reaction
Al + Fe₃O₄→ Al₂O₃ + Fe
give a coefficient
aAl + Fe₃O₄→ bAl₂O₃ + cFe
O, left=4, right=3b⇒3b=4⇒b=4/3
Al, left=a, right=2b⇒a=2b⇒a=2.4/3⇒a=8/3
Fe, left=3, right=c⇒c=3
The equation becomes :
8/3Al + Fe₃O₄→ 4/3Al₂O₃ + 3Fe x3
8Al + 3Fe₃O₄→ 4Al₂O₃ + 9Fe
mass number is the number of protons and neutrons in the nucleus of an isotope . how many electrons in an oxygen-18 atom ?
Answer:
In neutral oxygen atom 8 electrons are present
Explanation:
Fill in all the grey boxes including the green box. PLEASE HELP
Answer:
2Na + 2H2O ----> 2NaOH + H2
Explanation:
Please I'm begging for help. I'll give you ALL MY POINTS. JUST PLEASE HELP.
Worksheet: Balancing Equations
Fill in the blanks with the most appropriate term:
A ________________ ________________ tells the story of a chemical reaction. ________________ are the starting substances in the reaction while ________________ are the new substances that are formed. The large numbers in front of some of the formulas are called ________________. These numbers are used to ________________ the equation because chemical reactions must obey the Law of ________________ of Matter. The number of atoms of each element on both sides of the equation must be ________________ because matter
cannot be ________________ or ________________. When balancing equations, the only numbers that can be changed are ________________; remember that ________________ must never be changed in order to balance an equation.
II. Balance the following equations:
1. Al + O2 Al2O3
2. C3H8 + O2 CO2 + H2O
3. P4 + O2 P2O3
4. KNO3 KNO2 + O2
5. O2 + CS2 CO2 + SO2
6. KClO3 KCl + O2
7. N2 + H2 NH3
8. NaF + Br2 NaBr + F2
9. Al + HCl H +AlCl3
10. WO3 + H2 W + H2O
Answer:
Explanation:
A Chemical Equation tells the story of a chemical reaction. Reactants are the starting substances in the reaction while Products are the new substances that are formed. The large numbers in front of some of the formulas are called Coefficients. These numbers are used to Balance the equation because chemical reactions must obey the Law of Conservation of Matter. The number of atoms of each element on both sides of the equation must be Equal because matter cannot be Created or Destroyed. When balancing equations, the only numbers that can be changed are Coefficients; remember that Subscripts must never be changed in order to balance an equation.
Q1) 4Al + 3O2 ---> 2Al2O3
Q2) C3H8 + 5O2 -----> 3CO2 + 4H20
Q3) P4 + 3O2 -----> 2P2O3
Q4) 2KNO3 -----> 2KNO2 + O2
Q5) 3O2 + CS2 ------> CO2 + 2SO2
Try the rest out and tell me did you understand it?
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
What are some molecular compounds that we use in everyday life and their products?
Ex: Kirkland water - dihydrogen monoxide; H2O
Answer:
Water. Chemical Formula: H2O.
Table Salt. Chemical Formula: NaCl.
Sucrose (Sugar) Chemical Formula: C12H22O11.
Soaps. Chemical Formula: RCOO–Na, Where R is a long chain of carbon atoms ranging from 16-18 in number.
Toothpaste. Chemical Formula: CaCO3 or NaF.
Explanation:
When ionic compounds are added to water, they dissociate or break apart into ions. In the case of table salt, salt added to water dissociates into sodium ions and chloride ions. This would seem to be a chemical change. However, scientists do not consider this to be one, because the solid table salt remains after the water is evaporated. The atoms recombine into their original arrangement once the water is removed. Which word from the selection helps you understand that physical changes can be undone? a added b dissociate c recombine. d removed
Answer:
b dissociate
Explanation:
The proportions of substances in a mixture
O are always equal for each substance in the mixture
O can vary among the substances
O never can be determined accurately
O are always the same for each substance
2 points
"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.
a 12m tall electric pole is supported by a wire from top making an angle 60 with pole.what is lenght of pole?
Answer:
i think 70inches
Explanation:
A sample of sulfur has a mass of 32.066 grams. How many moles of sulfur
are present in the sample? *
Answer:
1 mole
Explanation:
Given parameters:
Mass of sulfur = 32.066g
Unknown:
Number of moles of sulfur = ?
Solution:
The number of moles of sulfur can be determined using;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of sulfur = 32g/mol
Number of moles = [tex]\frac{32.066}{32}[/tex] = 1 mole
what reaction type is the followong reaction
Answer:
its the fourth one please mark as brainlest
Explanation:
Elements in period 1 are
Answer:
Hydrogen - - helium..
...
what is the Transfer of energy from one object to another through direct contact?
Answer:]
Conduction is the transfer of energy from one molecule to another by direct contact. This transfer occurs when molecules hit against each other, similar to a game of pool where one moving ball strikes another, causing the second to move.
Explanation:
WILL GIVE BRAINLIEST ANSWER!!!
I have 345 mL of a 1.50 M NaCl solution. If I boil the water until the volume of the solution is 250. mL, what will the molarity of the solution be?
Answer: 2.07 M
Explanation:
(1.5m) (345ml)
---------------------
250 ML = 2.07M
HELP ASAP - How much energy is lost when 80.0 grams of steam at 100.C turns into liquid water at 100.C?
Answer:
Q = 43,000 calories = 180,000 joules = 180 Kilojoules
Explanation:
Heat flow for phase change can be defined as Q = m·ΔHv
ΔHv = Heat of Vaporization for water = 540 calories/gram = 2259 joules/gram = 2.259 Kilojoules/gram
m = mass of object of interest ( in this problem 80 grams steam 100°C converting to 80 grams of water at 100°C
Q = m·ΔHv = 80g x 540 cals/g =43.200 calories x 4.184 joules/cal = 180,748.8 joules (calculator answer) => 180,000 joules (2 sig. figs.) = 180 Kj
The graph indicates what about the relationship between atmospheric carbon dioxide and time
A)
over time, the amount of atmospheric carbon dioxide increases
B)
over time, the amount of atmospheric carbon dioxide decreases
over time, the amount of atmospheric carbon dioxide stays the same
D)
over time, the amount of atmospheric carbon dioxide does not change
Answer:
A)
over time, the amount of atmospheric carbon dioxide increases
Explanation:
Answer: a) over time, the amount of atmospheric carbon dioxide increases
Explanation:
What category of elements is characterized by the filling of d orbitals?
Halogens
Alkali Metals
Transition Metals
Alkaline Earth Metals
Explanation:
Transition Metals are characterized by the filling of d orbitals?
What are the units for the mass of aluminum sulfide
The units for the mass of aluminium sulphide is g/mol.
What is aluminium sulphide?Aluminium sulphide is a chemical compound with the formula Al2S3 and has the mass of 150.158 g/mol.
What are units?A unit is a standard that are used for making comparisons in measurements.
Unit conversions allow for measurements of a property that have been recorded using different units like centimetres to inches.
Hence, the units for the mass of aluminium sulphide is g/mol.
To learn more about units and aluminium sulphide here
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Non-living factors in an ecosystem are ______.
A. biotic
B. abiotic
C. antibiotic
PLEASE HELP!!!
Answer:
B. abiotic
Explanation:
in biology and ecology, abiotic components or abiotic factors are non living chemical and physical parts of the environment that affect living organisms and the functioning of ecosystems.