Answer:
Percent Composition
1. Find the molar mass of all the elements in the compound in grams per mole.
2. Find the molecular mass of the entire compound.
3. Divide the component's molar mass by the entire molecular mass.
4. You will now have a number between 0 and 1. Multiply it by 100% to get percent composition.
covers 70 precent of earths surface
Answer:
Water covers 70 percent of earth's surface.The Caribbean islands are known for their many resources. For example, the ore of aluminium is found in Jamaica and Guyana. (i) Briefly describe the extraction of aluminium from its named ore. Include in your description ONE ionic equation.
Answer:
i don't know send on my insta I'd its_arsh_pb27
Explanation:
Matter can undergo chemical reactions and nuclear reactions. Which statement is true only for nuclear reactions?
A - The mass of reactants is conserved
B - The energy of reactants is conserved
C - The atoms are reorganized into products.
D - The nuclei of the atoms.
Answer:
B - The energy of reactants is conserved.
D - the nuclei of atoms changes completely ( if that's the option)
Describe the properties of alkali metals. based on their electronic arrangement, explain whether they exist alone in nature.
The alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
What are the properties of alkali metals?The alkali metals have the high thermal and electrical conductivity. It has high lustre, ductility, and malleability as compared to other materials. Each alkali metal atom has one electron in its outermost shell which make more reactive.
So we can conclude that the alkali metals can't exist alone in nature because of incomplete outermost shell of alkali metals.
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Which of the following lists electromagnetic radiations from lowest to highest energy?
Your answer:
radio waves, microwaves, ultraviolet radiation, visible light
microwaves, radio waves, visible light, X-rays
radio waves, infrared radiation, visible light, ultraviolet radiation
gamma radiation, infrared radiation, visible light, X-rays
Answer:
Highest wavelength : radio waves
So lowest energy: radio waves
Hence order is:
radio waves < microwaves < IR waves < visible light < ultraviolet radiation < X-rays < gamma rays
Type the correct answer in each box.
Balance the chemical equation.
N₂O3-
N₂ +
0₂
The Balanced Reaction is 2N₂O₃⁻ -----> 2 N₂ + 3 0₂
What is a Balanced Reaction ?A reaction in which the number of atoms of each element in the reactant and the product are equal is called a Balanced Reaction .
It is given in the question:
To Balance the chemical equation.
N₂O₃⁻ -----> N₂ + 0₂
To balance the reaction , the number of molecules of each element , i.e. Nitrogen (N) and Oxygen (O) needs to be balanced
2N₂O₃⁻ -----> 2 N₂ + 3 0₂
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Can anyone please help me find molar masses of compounds. For example Copper (ll) sulfate (CuSO4)
Answer:
Explanation:
You would have to add up the atomic masses of all the compounds in the compound, making sure you include how many molecules of each are in the compound
For example, in CuSOA we have 1 molecule of Cu and S, as 4 molecules of O
The atomic masses are as follows:
Cu = 63.55 u
S = 32.065 u
O = 15.99 units
This is how we would add it up:
(Atomic mass of Cu) + (Atomic mass of S) + 4(Atomic Mass of O)
(63.55) + (32.065) + 4(15.99)
(63.55) + (32.065) + 63.96
= 159.575 u
The vapour pressure of water 12.3kPa at 300K. Calculate the vapour pressure of 1 molal solution of a non-volatile solute in it.
Answer:
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Explanation:
bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs
The process of seeping of water into the ground in called
Answer: Infiltration
Explanation: it is the process by which surface water, rainwater or snowmelt seeps into the ground
Could someone help me with this please
Answer:Your can use the internet There is a web site that is called periodic table.com it is very use full
Explanation:Have fun
what is indicated by the methyl- prefix
Answer:
B
Explanation:
The methyl prefix means theres a CH3 group bonded to a carbon in a hydrocarbon. This is called branching because it looks like a branched tree. This is literally cheating but you do you.
Perform the following operation and express the answer in scientific notation 8.6500x10^3+6.5500x10^5
Taking into account the scientific notation, the result of the sum is 6.6365×10⁵.
Scientific notationFirst, remember that scientific notation is a quick way to represent a number using powers of base ten.
The numbers are written as a product:
a×10ⁿ
where:
a is a real number greater than or equal to 1 and less than 10, to which a decimal point is added after the first digit if it is a non-integer number.n is an integer, which is called an exponent or an order of magnitude. Represents the number of times the comma is shifted. It is always an integer, positive if it is shifted to the left, negative if it is shifted to the right.Sum in scientific notationYou want to add two numbers in scientific notation. It should be noted that when the numbers to be added do not have the same base 10 exponent, the base 10 power with the highest exponent must be found.
In this case, the highest exponent is 5.
Then all the values are expressed as a function of the base 10 exponent with the highest exponent. In this case: 8.6500×10³= 0.086500×10⁵
Taking the quantities to the same exponent, all you have to do is add what was previously called the number "a". In this case:
0.086500×10⁵ + 6.5500×10⁵= (0.086500+ 6.5500)×10⁵= 6.6365×10⁵
Finally, the result of the sum is 6.6365×10⁵.
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no.of atoms in 12g of He
Answer:
hope this will help you......
Can someone please help? THIS IS SUPER HARD!!!!!!!
Organic compounds including carboxylic acids are named uisng IUPAC nomenclature technique.
What are Carboxylic acids ?
A carboxylic acid is an organic acid that contains a carboxyl group (C(=O)OH) attached to an R-group.
The general formula of a carboxylic acid is R−COOH or [tex]RCO_2H[/tex], with R referring to the alkyl, alkenyl, aryl, or other group.
Following are the names of given struture ;
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Which energy source has been developed and improved by chemists?
A. coal
B. wind
C. battery
please don't say nuclear as it is quite literally not a choice.
Which equation represents an addition reaction?
(1) c3h6 + cl2 c3h6cl2
(2) caco3 cao + co2
(3) cacl2 + na2co3 caco3 + 2nacl
(4) c3h8 + cl2 c3h7cl + hcl
c3h6 + cl2---- c3h6cl2 is a type of equation represents an addition reaction because new products are formed.
What is addition reaction?Addition reaction is a type of reaction in which one molecule combines with another to form a bigger molecule having no other products. We can see that the above reaction has no byproduct.
So we can conclude that c3h6 + cl2---- c3h6cl2 is a type of equation represents an addition reaction because new products are formed.
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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?
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.
When balancing chemical equations the left hand side of the equation is known as the ______, while the right hand side is known as the ______.
Answer:1# reactants 2#coefficient
Explanation:
Calculate the ionization constant of each reaction. hcl (aq) + h2o (l) equation h3o+ (aq) + cl- (aq); [hcl] = 16.9m, [h3o+] = 13.3m, [cl-] = 7.4mka =
The ionization constant from the reaction as shown in the calculation is 5.8.
What is the ionization constant?The term ionization constant refers to the extent to which the acid is ionized in solution. It is calculated from;
Ka = [H3O^+] [Cl]/[HCl]
Thus when we substitute the values;
Ka = 13.3 * 7.4/ 16.9
Ka = 5.8
The ionization constant from the reaction as shown in the calculation is 5.8.
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Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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Moving electrons are found to exhibit properties of.
Answer:
both particles and waves
Explanation:
this is known as wave-particle duality.
I hope this helps.
Have a nice day.
2)a dish contains a blackish-yellow powder.when a magnet is moved over it black particles iron get stuck to the magnet and only yellow powder which is sulphur is left behind. was your original powder an element compound or mixture
Match the following items.
1. not affected by a magnet
2. mostly space
3. flows freely but particles still attract
4. positively charged particles
5. free to move in all space
6. negatively charged particles
7. atoms nearly fixed in space
8. helium nucleus
proton
solid
liquid
gamma ray
gas
atoms
electron (beta)
alpha particles
Answer:
1. not affected by a magnet 1 liquid
2. mostly space 2 solid
3. flows freely but particles still attract 3 proton
4. positively charged particles 4 gas
5. free to move in all space 5 alpha particles
6. negatively charged particles 6 atoms
7. atoms nearly fixed in space 7 gamma ray 8. helium nucleus 8 electron (beta)
How is the modern periodic table different from Dmitri Mendeleev's table?
A. Elements that have similar properties are now grouped together.
O B. Elements are now organized by increasing atomic mass.
OC. The lanthanides and actinides are now in rows below the main
table.
D. The table is now used to predict the properties of elements.
Elements are now organized by increasing atomic mass. Hence, option B is correct.
What is a periodic table?The periodic table is a tabular array of chemical elements organized by atomic number.
Mendeleev's periodic table orders the elements based on their atomic mass whereas the Modern periodic table orders the elements based on their atomic number.
Hence, option B is correct.
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In the photo
Pls pls pls pls pls pls pls pls pls pls
The correct answers are Potential and Kinetic energy.
What are potential energy and examples?An object can store energy as a result of its position. For example, the heavy ball of a demolition machine is storing energy when it is held at an elevated position. This stored energy of position is referred to as potential energy. Similarly, a drawn bow is able to store energy as a result of its position.
What is kinetic energy?Kinetic energy is a form of energy that an object or a particle has by reason of its motion. If work, which transfers energy, is done on an object by applying a net force, the object speeds up and thereby gains kinetic energy.
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Need help ASAP!
How many moles of gas does it take to occupy 520 mL at a pressure of 400 torr and a temperature of 340 K? Use the conversion factors 760 torr = 101.3 kPa and 1 mL = 0.001 L. Show all of your work.
Answer: B - 0.0098 moles
Explanation:
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how does air move around the earth
Which of the following materials fall in the category of a ‘‘pure substance’’?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, brick, wood, Air
Answer:
1) Ice, iron, calcium oxide and mercury are pure substances since they contain particles of only one kind of matter.
2) In contrast, milk, hydrochloric acid (hydrogen chloride gas dissolved in water), brick and air cannot be called pure substances because they consists of particles of more than one kind of matter.
When energy decreases what happens to particle motion?
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:
Select the correct answer. the compound diborane can be used as a rocket propellant. what is the percent composition of boron in diborane (b2h6)? a. 22% b. 25% c. 39% d. 75% e. 78%
The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.
What is diborane?Diborane is a poisonous, reactive gas that is produced by the action of acids on borides. Diborane is used as a reducing agent for making other chemicals and also act as a catalyst.
So we can conclude that The percent composition of boron in diborane (b2h6) is 78% because the mass of boron is higher than hydrogen atom.
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The compound diborane can be used as a rocket propellant. the percentage composition of boron in diborane (B2H6) is 75%. Option D. This is further explained below.
What is the compound diborane?Generally, Diborane is simply defined as a compound having the molecular formula B2H6, Diborane is more often known as diborane.
In conclusion, As a rocket fuel, diborane is a useful chemical. Diborane (B2H6) contains 75 percent boron by weight.
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