Explanation:
Scientists most especially chemists use the mole concepts through balanced chemical equations and molar masses to represent chemical reactions and account for the amount of substances.
The mole concept entails finding molar relationships between reactants and products in a chemical reaction. Mole connects difference chemical parameters and it is used in quantitative analysis of chemical reaction.
First, we work from the known to the unknown. The known is the specie whose mass or number of moles is given.Number of moles = [tex]\frac{mass}{molar mass}[/tex]
After obtaining the number of moles, then go ahead to compared using the balanced reaction with that of the unknown. Then from them find the mass of the unknown.Which measurement shows the correct degree of precision for this ruler?
a. 1.5 cm
b. 1 cm
c. 1.55 cm
Answer:
1.5 cm
Explanation-
I took it ...
Does N2F2 obey the octet rule? Explain.
8.
Which of the following is NOT a desirable property for a material that is to be made ir
window?
A) hard
B) waterproof
C) opaque to light
D) rigid
Which element is a metalloid?
Si
Ne
Br2
Cl2
Answer:
There are 2 answers. A and C
Explanation:
Si is Silicon, which is a metalloid,
Br2 is Bromine, which is a metalloid
Which describes the composition of carbohydrates?
Answer: Carbohydrates (carbo- = “carbon”; hydrate = “water”) contain the elements carbon, hydrogen, and oxygen, and only those elements with a few exceptions. The ratio of carbon to hydrogen to oxygen in carbohydrate molecules is 1:2:1.
HOPE THIS HELPS
CAN U GIVE ME BRAINLIEST
Oxygen Molecules taken in per breath: The Athletes result will be?
Answer:
Explanation:
the answer is higher because there is more exercise that makes it higher
hope this helps
2. Using what you know of particle motion in solids, liquids, and gases, explain why you think temperature changes affect a substance's
state of matter. Use the terms particle motion, temperature, solid, liquid, and gas in your answer.
Explanation:
Temperature changes have significant impact on the physical states of matter and it drives most physical changes and even the chemical alteration occurring to substances.
When the temperature of substance increases, the particle's average kinetic energy increases. The average kinetic energy of the particles is the component heat resident within a body. As this energy increases, for solids, their particles in fixed lattices breaks free and begins move. Further increase in the temperature will cause a motion which leads to flowing of the particles on top of one another. This eventually culminates in bond breaking and hence gases forms. When heat is removed, the reverse process is what is ensues.Which choice names part of the lithosphere?
-inner core
-outer core
-all of the mantle
-crust and outer part of the mantle
pls i give a brainest
Plz help me with is thank you
Questions aren't clear, if u need assistance let me know .. I'm in year11 I can help out.
What is the molality of a solution that has 6 mol of CaCl2 in 3 kg of water?
A. 2 m
B. 0.5 m
C. 6 m
D. 3 m
Answer:
2m
Explanation:
Hope this helps :)
Answer:
Answer is B.
Explanation:
3mol/6kg = 0.5m
According to the rate law for the reaction, an increase in the concentration of hydronium ion has what effect on this reaction?
Answer:
The rate of reaction increases.
Explanation:
higher concentration --> more collisions --> rate increases
If 3 moles of a compound use 12 J of energy in a reaction, what is the A
Hreaction in kJ/mol?
O A. 0.004 kJ/mol
O B. 4 kJ/mol
O C. -4 kJ/mol
O D. -0.004 kJ/mol
How many grams of aluminum oxide are produced according to the reaction below given that you start with 13.2 grams of Al and 13.2 grams of O2?
Reaction: 4AI + 3 02 → 2A1203
Answer: 24.87g Al2O3
Explanation: Aluminum is our limiting reagent
[tex]13.2g Al * \frac{1 mol Al}{26.98 g} * \frac{2 mol Al2O3}{4 mol Al} = 0.244 mol Al2O3[/tex]
First of all we need to convert the grams of aluminium to moles, then use the molar fraction of the balanced equation (4 moles of aluminium equals 2 of aluminum oxide).
If we made the same procedure with the oxigen we get a 0.273 mol of Al2O3, therefore the O2 is the excess reagent.
The last step is convert the moles of the limiting reagent to grams
[tex]0.244 mol Al_{2} O_{3} * \frac{101.96g}{1mol Al2O3} = 24.87g Al2O3[/tex]
And that´s it!
Four oranges were placed in a series circuit. Approximately what voltage did this produce?
Answer:
Four times the original amount if only one orange was used
Explanation:
We can assume that the oranges all have equal voltages. Connecting them in series will have an increasing effect on the voltage delivered. In our case, this will produce 4 times the voltage of the circuit when only one orange is used.
Whenever simple cells are connected in series, the voltages of the individual cells are added up to form the voltage of the whole circuit.
Let us assume that the voltage of each of the oranges is approximately 0.9 volts. The Voltage produced when the 4 oranges are joined in series is 0.9 + 0.9 + 0.9 + 0.9 = 3.6 volts
2 Students were asked to identify the location of elements in the periodic table based on clues
printed on game cards.
Element 1
• Shiny black solid
• Metalloid
• 3 valence electrons
• 2 energy levels
Element III
• Colorless gas
• Nonmetal
• 8 valence electrons
• 5 energy levels
Element II
• Steel-gray solid
• Brittle metalloid
• 5 valence electrons
• 4 energy levels
Element IV
• Silvery-white solid
• Soft metal
• 2 valence electrons
• 6 energy levels
Based on the data, which periodic table shows the correct location of the four elements?
Answer:
B
Explanation:
I took the test
Element 1 is silicon. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary.
What is element?A material that cannot be destroyed chemically is referred to as a chemical element. Although chemical processes cannot modify an atom, nuclear reactions can create new elements.
The quantity of protons an element has defines it. An element's atoms all contain the same amount of protons, but its electron and neutron counts might vary. Ions are produced by altering the electron to proton ratio, whereas isotopes are produced by altering the neutron count.
118 known elements are present. A study is being done to create element 120.1. The periodic table will have to be modified to include element 120 after it has been created and validated. Element 1 is silicon.
Therefore, the element 1 is silicon.
To know more about element, here:
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Question: Based on this information, which type of light is more likely to damage the material?
1)The gamma ray light is more likely to damage the material because the gamma ray light can
pull energy out of the material when it passes through the material.
b
2)The X-ray light is more likely to damage the material because the X-ray light bounces off of
the material, which means that it has more energy.
3)There is no way to know because they are two different types of light, and different types of
light can change a material in different ways.
4)Neither type of light is likely to damage the material because the material does not take in
energy from either the X-ray light or the gamma ray light.
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Answer: It will be D which is number 4........
Neither type of light is likely to damage the material, because the material does not take in energy from either the X-ray light or the gamma ray light.
Explanation:
10 pointsss Where are tsunamis likely to originate?
Answer:
Pacific Ocean
Explanation:
How much iron is present in 1.3400 grams of iron (III) oxide?
Answer:
69.94%
Explanation:
69.94% IRON IS PRESENT
what is the answer pls help me
Answer:fist one 2 and 3 next
Explanation:
i looked it up
How many unpaired electrons are present in V3+?
Answer: two unpaired
Explanation: In general, electrons are removed from the valence-shell s-orbitals before they are removed from valence d-orbitals when transition metals are ionized. And thus, V3+ is paramagnetic, because it has two unpaired 3d-electrons.
Balance Nuclear Reaction
94239Pu --> 24He + ________
a student wants to determine if different types of car wheels impact how far a car will travel after leaving a ramp. The same car and the same ramp or used for each trial run. The data collected are shown in the table.
A. Large plastic Wheels
B. Large rubber Wheels
C. Small rubber Wheels
D. Small plastic Wheels
Answer:
b. it has the longest average distance
Use the drop-down menus to complete the statements.
A segment of DNA is called a
.
A complex of nucleic acids and proteins that make up chromosomes is called
.
A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a
.
A segment of DNA is called a gene.
A complex of nucleic acids and proteins that make up chromosomes is called Chromatin
A structure in the nucleus of an eukaryotic cell that is made up of condensed DNA is called a chromosome.
Answer:
1. Gene
2. Chromatin
3. chromosome
Explanation:
I hope this helps you :)
What are quantum numbers?
Answer:
a number which occurs in the theoretical expression for the value of some quantized property of a subatomic particle, atom, or molecule and can only have certain integral or half-integral values.
Explanation:
In other words, it is a number that is Part of scientific theories or chemistry
Need help on this please help
Answer:
The answer is: The Earth rotates on its axis.
What is the heliosheath?
Answer:
The heliosphere is the vast, bubble-like region of space that surrounds and is created by the Sun.
5. How many mol are in 2.5x10 23
atoms of copper?
a. 0.42 mol Cu (yellow)
b.4.2 mol Cu (pink)
c. I.8 mol Cu (blue)
calculate the percentage by mass of oxygen in ammonium nitrate
Answer:
Percent composition of O is 48g80g×100%=60%
Calculate the percentage by mass in each element
N in NH3
Answer:
82.35%.
Explanation:
Mass of 1 molecule of ammonia
NH₃ = 14+3(1)
= 17
Calculating percentage by mass of N.
[tex]\%=\dfrac{\text{Mass of Nitrogen atom}}{\text{Mass of ammonia molecule}}\times 100[/tex]
[tex]\%=\dfrac{14}{17}\times 100\\\\=82.35\%[/tex]
So, the required percentage is 82.35%.
how many formula units are in 0.96 moles of H2O
Answer:
18.02 amu
Explanation:
