Which elements are;
a)solids,
b)liquids
c)gases
at 25°C
What is the pattern in the periodic table for valence electrons and orbital shells of an element?
Answer:
Valence electrons increase as you go across the table (by periods)
Orbital Shells increase as you go down the table (rows)
If we start with 20 atoms of plutonium – 239, how many would remain after 48,240 years?
The amount of atoms of plutonium – 239 that would remain after 48240 years is 5 atoms
How to determine the number of half-lives Half-life (t½) = 24100 yearsTime (t) = 48240 yearsNumber of half-lives (n) =?n = t / t½
n = 48240 / 24100
n = 2
How to determine the amount remaining Original amount (N₀) = 20 atomsNumber of half-lives (n) = 2Amount remaining (N) = ?N = N₀ / 2ⁿ
N = 20 / 2²
N = 20 / 4
N = 5 atoms
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Balance the folowing equation.
S + 02
ws
SO:
Answer:
s+o2=so2
Explanation:
i hope it will help u
butane reacts with chlorine to form two isomers of chlorobutane. What type of reaction is this?
1. How many valence electrons are in a molecule of Acetate?
a 2
b 6
c 5
d 1
2. If Acetate is part of an ionic bond, what will it's charge be?
a neutral
b negative
c positive
3. Will Acetate gain, lose, or share electrons in an ionic bond?
a share
b lose
c gain
4. In an ionic bond, how would Acetate be catagorized?
a anion
b cation
5 Is Acetatea metal, nonmetal, or polyatomic ion?
a metal
b nonmetal
c polyatomic ion
Answer:
the same amount of protons
a two paragraph summary on how old is earth it's for science
Answer:
Explanation:
By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years
7. Why would it be difficult to measure the rate of reaction for the rusting of iron?
Answer:
For rusting, it is difficult to write an equation due to the complexity of the reaction. Thus, we can express the reaction like the following. According to the law of conservation of mass, the increased mass of nail and rust is the amount of oxygen.
Explanation:
I hope this helps:)
What chemicals must be cycled through a Martian environment in order for the planet to be habitable for life? Describe how scientists intend to make those resources available in such a harsh environment.
How many grams of sand (SiO,) would need to be weighed out to equal 0.3 moles?
copper sulphate solution turns the colour of litmus into red but litmus changes into blue with baking soda solution although both are salts. Give reason why?
Answer:
Copper sulphate is an acidic salt: It is the product of the reaction between a weak copper base and a strong acid , H2SO4
Litmus has a red colour in acidic solutions:
Conclusion: Acidic copper sulphate solution turns blue litmus to red
Baking soda is a basic salt : It is the reaction product of a weak acid , CO2 and a strong base , NaOH
Litmus has a blue colour in basic solutions:
Conclusion: basic baking soda solution turns red litmus to blue
PLS HELP!!
Which of these processes are catabolic reactions? Check all that apply.
conversion of glycogen to glucose
conversion of glucose to stored lipid
bone growth
reduction reactions
breakdown of ATP to form ADP
Answer:
It's A) and E)
Explanation:
Did the assignment
Answer:
A. conversion of glycogen to glucose and
E. breakdown of ATP to form ADP
Explanation: I also did the assignment.
Which best explains why water has a high specific heat?
Answer:
The Presence of inter molecular hydrogen bonding makes it to heat at higher temperature as energy required to break them , hence the high specific heat
Why does lithium have a higher ionization energy compared to sodium?
Answer:
There are 11 protons in a sodium atom but only 3 in a lithium atom, so the nuclear charge is much greater. ... The only factor left is the extra distance between the outer electron and the nucleus in sodium's case. That lowers the ionization energy.
Please please please someone give me the answers to all of these our teacher is very bad at explaining things and we are all confused i really need the answers please
Answer: #1 2Al + 2S - Al2S2
Explanation: You have to make sure there are 2 of each on each side
23) What is the chemical formula for carbon dioxide?
A CO2
B C2O
C CO2
D 2CO
Please help me ty! Correct answers only ty
Answer:
Ca(NO3)2 + Na2C2O4 ---> <---- Ca + 2NO3 + 2Na + C2O4
why does the pressure of gas increase due to inclement of heat
Answer:
When the gas is heated, the particles will gain kinetic energy which will make them move faster.
Explanation:
what is difference between dipole dipole interaction and hydrogen bonding
Answer:
A dipole-dipole force is when the positive side of a polar molecule attracts the negative side of another polar molecule.
A hydrogen bond is a dipole-dipole force and is an attraction between a slightly positive hydrogen on one molecule and a slightly negative atom on another molecule.
Answer:
Hydrogen bonds are dipole-dipole interactions in which at least one of the atoms involved is a hydrogen atom. Dipole-induced dipole bonds are those electric bonds that exist between a molecule with a permanent dipole moment and a molecule in which a temporary dipole moment has been induced.
How many moles of gas are in a 30 liter scuba canister if the temperature
of the canister is 300 K and the pressure is 200 atmospheres?
Answer: the answer is n= 0.487 mol
Explanation: i took the test and got it right
how many atoms are in 3.5 moles of arsenic atoms?
Answer:
1 mol of atoms = 6.022 ×1023 atoms. 3.5mol × 6.022 × 1023 atoms 1mol = 2.11 × 1024 atoms =.........
Explanation:
2160.64 atoms!
Compound X has a molar mass of 104.01 g.mol and the following composition:
element
mass %
nitrogen
26.93%
fluorine
73.07%
Write the molecular formula of X.
Answer: N2F4
Explanation:
A chemist determined by measurements that 0.0400 moles of potassium iodide participate in a chemical reaction. Calculate the mass of potassium iodide that participates. Be sure your answer has the correct number of significant digits.
Answer:
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Answer:
j
Explanation:
[H+] for a solution is 1 x 10^-7 M. This solution is _____________.
A. acidic
B. basic
C. neutral
Answer:
the answer is C neutral
Explanation:
if the ph is lower then 7 its acidic
if its higher then 7 its basic
and a ph of 7 is neutral
The following equation represents what type of chemical reaction?
2Ag + H2S → Ag2S + H2
A. Double Replacement
B. Single Replacement
C. Decomposition
D. Synthesis
Answer:
single replacement
Explanation: N/A
What is this molecule an
example of?
A. an atom
B. a mixture
C. an element
D. a compound
PLEASE HELP ASAP
Answer:
D. Compounds
Explanation:
Because it's says that have 3 components
What name is given to this type of diagram
Answer:
There's no graph attached to the question
How does the entropy of a geyser system change as energy is added to the system ??
Answer:
Entropy increases as temperature increases. An increase in temperature means that the particles of the substance have greater kinetic energy. The faster moving particles have more disorder than particles that are moving more slowly at a lower temperature.
Explanation:
The entropy of the system increase as the temperature increase because at higher temperature there will be more randomness in the molecules.
What is entropy?Entropy can be described as a measure of spontaneous changes that take place in a system. In simpler words, entropy is the tendency of the universe towards disorder.
Entropy measures of randomness or disorder of a thermodynamic system and is represented by ‘S’. The value of entropy is dependent upon the amount of substance so it is an extensive property.
The change in the value of entropy depends on changes in quantities such as temperature, pressure, volume, and the number of moles of substance present in the system.
When the temperature of the system increases the kinetic energy of the molecules increases and they start to move faster. Therefore, the entropy of the geyser system increase as energy is added to the system.
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q=The+diagram+below+represents+the+building+block+of+a+DNA+molecule+which+is+a+type&rlz=1CATPIA_enUS942&sxsrf=ALeKk02q0TrtMmY64OTcRfnI6UtHtyfVwg:1614616724451&source=lnms&tbm=isch&sa=X&ved=2ahUKEwi2l7yCxI_vAhVjg-AKHXaSCVcQ_AUoAXoECBIQAw&biw=1517&bih=726#imgrc=YTAoiVTgM8UvnM
Answer:
we need to see the diagram
Explanation:
How many moles are in 4.0 x 1023 atoms of iron?
Answer:
4092 atoms of iron i am guessing
Explanation:
