Answer:
The answer is 0.000002 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1.23\times {10}^{18} }{6.02 \times {10}^{23} } \\ = 0.00002043...[/tex]
We have the final answer as
0.000002 molesHope this helps you
the product of 173.06 times 0.21 should be reported as what using proper number of sig figs?
Answer:
36.3
Explanation:
The full answer would be 36.3426, but because of the 0.21, you round it down to 3 sig figs.
which balances the equation Mg + O2 → MgO
Answer:
2Mg+[tex]O_{2}[/tex]→2MgO
Explanation:
The first step is magnesium + oxygen equals magnesium oxide
The second step is changing that into an equation which looks like Mg+[tex]O_{2}[/tex]→MgO
The third step is to 2*Mg and 2*O as well as the product has to be 2*Mg,2*O which gets the equation to become balanced as 2Mg+[tex]O_{2}[/tex]→2MgO
The coefficient 2 balance the given reaction. The balanced equation for the given reaction is given as [tex]\rm Mg + O_2 \rightarrow 2MgO[/tex].
A balanced equation is a mathematical representation of a chemical reaction that respects the law of mass conservation. It depicts the reactants and products of the reaction, as well as the relative amounts of each species. The unbalanced equation is [tex]\rm Mg + O_2 \rightarrow MgO[/tex]. One magnesium (Mg) atom on the left side and one on the right side, so the magnesium is already balanced. Balance the oxygen (O) atoms. On the left side, there are two oxygen (O) atoms present in the O2 molecule. On the right side, there is only one oxygen (O) atom in the MgO molecule. To balance the oxygen atoms, we need to add a coefficient of 2 in front of MgO: [tex]\rm Mg + O_2 \rightarrow 2MgO[/tex]. The balanced equation is [tex]\rm Mg + O_2 \rightarrow 2MgO[/tex].
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how do i know if they are congruent
Ionic compounds tend to be ...
A. Hard
B. Soft
C. Bendable
Answer:
A
Explanation:
Answer:
A. Hard
Explanation: got it correct on Edg
name the gas evolved when metal carbonates react with acid and state the method
Answer:
the gas evolved is carbon dioxide
Explanation:
for example we can have a look at sodium carbonate reaction with hydrochloric acid
when sodium carbonate reacts with hydrochloric acid, it results in sodium chloride, carbon dioxide and water.
Answer: Carbon dioxide
Is it reasonable to expect that the atom model will change again in time?
Select the correct answer
Which statement best supports the idea that water conservation is important for human societies?
OA Once humans use water, it cannot be reused ever again,
OB. Only about 1% of the freshwater on Earth is easily accessible.
OC Water is constantly being lost from the hydrosphere
OD. Most land animals use salt water instead of freshwater.
Answer:
Only about 1% of the freshwater on Earth is easily accessible.
Explanation:
Freshwater accounts for a minimal proportion of water resources on planet earth. About 70 percent of the world surface area is covered by water, but only about 2.5 percent of this mass of water is fresh. The remaining are marine or salt water. Amazingly, just about 1 percent of this freshwater is easily accessible. The other 1.5% is trapped in glaciers and snowfields.
This underscore the need for water conservation on the planet since fresh water is a scarce resource and people living in many areas have no access to fresh water.
why does it take more energy to evaporate water than to melt ice?
Answer:
The energy required to completely separate the molecules, moving from liquid to gas, is much greater that if you were just to reduce their separation, solid to liquid. Hence the reason why the latent heat of vaporization is greater that the latent heat of fusion.
Answer:
It takes longer to boil water than to melt ice because of the difference in the amount of heat required to overcome the forces of attraction by keeping the temperature constant during this time. ... This is the reason it takes longer in boiling than in melting.
HURRY !The number of electrons in an atom decreases as you move from left to right in the periodic table.
Please select the best answer from the choices provided
T or F
I believe this is false, due to the fact that atomic radius decreases while you move right to left...but please, correct me if I'm wrong ^^'''
Answer:
False
Explanation:
How many miles are there in 12327 feet
Explanation:
2.3346591 miles is in 12327 feet
Answer:
2.3346591Explanation:
Always remember, to convert
feet to miles, all you have to do is
divide the length by 5280 and then
you will get this much miles: 2.3346591
Hope this helps! <3
Help me answer the question please I don’t get it this is earth science not chemistry.
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A 55kg skier accelerated at 3 m/s^2. How much force must the skier exert?
Answer:
The answer is 165 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 55 kg
acceleration = 3 m/s²
We have
force = 55 × 3
We have the final answer as
165 NHope this helps you
pls help ill mark you as brainliest
Answer:
Explanation:
Synthesis- D
Combustion- C
Decomposition- A
Single Displacement- C
Double Displacement- B
Temperature is a measure of the average _____energy of particles in a substance.
Answer:
kinetic energy
Explanation:
Answer:
kinetic energy
Explanation:
In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes.
The chemical combination of two or more different atoms in fixed amounts is called a(n)
A. element
B. mixture.
C. orbit
D. compound.
Answer:
D. compound
Explanation:
Answer:
compound
Explanation:
study island
What is the chemical name for Cu(NO3)2
Answer:
The chemical name is Copper(II) nitrate
Explanation:
I need some good help
Answer:
lol
Explanation:
Answer:
felt that.__________
The
which are represented by a single uppercase letter, or represented by an uppercase letter followed
by a lowercase letter. This tells you the types of elements in the compound.
Answer:
Elements
Explanation:
The elements which are represented by a single uppercase letter, or represented by an uppercase letter followed by a lowercase letter. This tells you the types of elements in the compound.
Elements are one of the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means. They are made up of small indivisible particles called atoms, all having the same number of protons.
Magnetic substance is used to seperate
none magnetic substances.
False
True
Answer:
the answer should be true
hope this helps :)
Explanation:
40 g of CaCO3 is how many moles of CaCO3?
10 moles
0.4 moles
40 moles
100 moles
Answer:
0.4 moles
Explanation:
To convert between moles and grams you need the molar mass of the compound. The molar mass of of CaCO3 is 100.09g/mol. You use that as the unit converter.
40gCaCO3* 1mol CaCO3/100.09gCaCO3 = 0.399640 mol CaCO3
This rounds to 0.4 moles CaCO3
1pt The picture shows the moving molecules in a beaker containing a liquid. What will happen if the molecules increase their speed? A. The liquid will change into a solid. B. The temperature of the liquid will rise. C. The temperature of the liquid will fall. D. The molecules wil gain mass. her is the picture
Answer:
B. The temperature of the liquid will rise.
Explanation:
As the molecules present in the beaker will increase their speed that will result in rise in the temperature of the liquid.
This is so because as the movement or motion of molecules increases, atoms vibrate faster, and its collision with each other and with the wall of the beaker increases that causes a rise in the temperature of the liquid. If the molecules move slowly then the temperature will fall down.
Hence, the correct answer is "B. The temperature of the liquid will rise.".
12. A malleable sheet of metal used to wrap food in the kitchen is made of only aluminum. What can be said about the metal sheet?
Answer:
is aluminium prepared in thin metal leaves with a thickness less than 0.2 mm (7.9 mils); thinner gauges down to 6 micrometres (0.24 mils) are also commonly used.[1] In the United States, foils are commonly measured in thousandths of an inch or mils. Standard household foil is typically 0.016 mm (0.63 mils) thick, and heavy duty household foil is typically 0.024 mm (0.94 mils). The foil is pliable, and can be readily bent or wrapped around objects. Thin foils are fragile and are sometimes laminated with other materials such as plastics or paper to make them stronger and more useful. Aluminium foil supplanted tin foil in the mid 20th century.
• True False estion 2 (1 point) Water and ice are made from the same molecule H2O True False
Answer:
true i think
Explanation:
The process of ionic bonding is not the same as the process of metallic bonding. Which of the following statements is true
about these processes?
1. In ionic bonding, only ions of the same element combine to form a compound.
2. In metallic bonding, valence electrons can move freely between atoms.
3. Substances formed through ionic bonding are not considered compounds.
4. In metallic bonding, electrons are transferred between elements in fixed ratios.
Answer: In metallic bonding, valence electrons can move freely between atoms
Explanation:
when metals bond to one another, their outermost energy levels overlap. this allows valence electrons to move freely between atoms in what is sometimes called a “sea of electrons
Record the length of the object shown.
Answer: 7.26 mm
I did the test already.
How many d electrons does I (atomic number
53) possess?
1. 10
2. 5
3. 8
4. 0
5. 20
6. 53
7. 16
Answer:
6. 53 is the answer. Hope this helps:)
The number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.
What is an Atomic number?An atomic number may be defined as the number of protons in the nucleus of an atom that significantly represents the characteristic of a chemical element and determines its specific place in the modern periodic table.
According to the modern periodic table, an element that has an atomic number of 53 is known as Iodine. Its electronic configuration is [tex]1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2, 3d^1^0, 4p^6, 5s^2, 4d^1^0, 5p^5[/tex]. Thus, according to this electronic configuration, the total number of d electrons are [tex]3d^1^0 and 4d^1^0[/tex].
Therefore, the number of d electrons that an atom of atomic number 53 possess are 20. Thus, the correct option for this question is 5.
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Why are atoms neutral?
A They have neutrons in the nucleus
B. They have the same number of protons and electrons
They tend to have 8 valence electrons
D
None of the above
Answer:
B. They have the same number of protons and electrons
Explanation:
Protons have a charge of +1, electrons have a charge of -1, and neutrons have no charge, making them neutral. When there are the same number of protons as there are electrons, the charges balance out, leaving you with a neutral atom.
How many electrons does each lithium atom provide to the voltaic cell?
A. 1
B. 2
C. 3
D. 4
Answer:
c. 3 electrons
Explanation: for the element of LITHIUM, you already know that the atomic number tells you the number of electrons. That means there are 3 electrons in a lithium atom.
Why are prefixes used in naming covalent compounds?
Answer:
1 - mono
2 - di
3 - tri
4 - tetra
5 - penta
6 - hexa
7 - hepta
8 - octa
9 - nona
10 - deca
Explanation:
These are prefixes that can go on an element.
For example:
CO2= Carbon Dioxide
Answer:
The same atoms can combine in more than one ratio.
Explanation:
How do you figure out what roman numeral to use? Give a specific example
Answer:Explanation:
The Roman numeral must have the same value as the charge of the ion. In our example, the transition metal ion Fe2+ would have the name iron(II). Add the name of the anion to the transition metal ion. In our example, FeCl2 would have the name iron(II) chloride since the anion is Cl-, which has the name chloride.
