Answer:
what are you supposed to answer???
Explanation:
Calculate the number of moles in 19.3g of NaCl
Answer: 0.33 mole
Explanation:
Let the number of moles be represented by x.
We should note that 1 mole of NaCl = 58.44g
Therefore, the number of moles in 19.3g of NaCl will be :
= 19.3/58.44
= 0.33 mole
Therefore, the number of moles in 19.3g of NaCl is 0.33 mole
For each problem listed in Column A, select from Column B the letter of the conversion factor that is needed to solve the problem. You may need to use more than one conversion factor to solve the problem.
kdjwsnakjNAdskjndkjnknjfdskjnfjkngdjknfjkgskjdgjkndfsjknd
if you need some points and are good at science help!
Answer:
region 2 and region 3
Explanation:
you can tell by the color of the land my friends^^
Answer:
2, 3 They are closest to the equator, and the equator marks to hottest places on earth.
Explanation:
I hope this helps you.
One day on her walk home from school, Leann noticed some rust on an old car.
She remembered that chemical equations can summarize what happens in a chemical reaction. What is the name of the two parts found on the left side of the equation below?
4 Fe + 3O2 → 2Fe2O3
Answer:
Iron and Oxygen
Explanation:
Fe is Iron and O2 is Oxygen
During spontaneous fission, a nucleus of 25498Cf can produce 11846Pd, four neutrons, and what other nuclide?
Answer: 52Te - Tellurium
Explanation: Radioactivity occurs when an unstable nucleus of an element decompose into a stable element by emitting particles or forms of eletromagnetic energy. There are types of radioactivity and Spontaneous Fission is one of them.
In Spontaneous Fission, the unstable, also called parent, nucleus splits into two smaller nuclei and emitts one or more neutrons.
The reaction spontaneous fission of Cf is represented below.
25498Cf ⇒ 11846Pd + 4n + X
The characteristics of each element of the equation are:
1) The element Cf has atomic mass 254 and atomic number 98.
2) Element Pd has atomic mass 118 and atomic number 46.
3) Neutron is represented as n, has no atomic number and atomic mass 1.
Given these properties, to determine the other nuclide, we have to find out the nuclide's atomic number, as each element in the periodic table has its own atomic number.
At the left side of the equation, atomic number is 98. At the right side, element X's atomic number is
98 - 46 + 0 = 52
In the periodic table, the element with atomic number 52 is Tellurium, whose symbol is Te.
The other nuclide for the spontaneous fission is Tellurium (Te).
Rain that containing excess of acid is called
Answer:
The rain containing excess of acid I called acid rain
Answer:
acid rain
Explanation:
Thats literally what its called
What is the mass of 8.03 mole of NH3? (NH3 is 17g/mol)
Answer:
the mass of 8.03 mole of NH3 is 136.51 g
Explanation:
The computation of the mass is shown below:
As we know that
Mass = number of moles × molar mass
= 8.03 mol × 17 g/mol
= 136.51 g
Hence, the mass of 8.03 mole of NH3 is 136.51 g
We simply multiplied the number of moles with the molar mass so that the mass could come
Who arranged the elements according to atomic mass, and used the arrangement to predict the properties of missing elements.
a john dalton
b henry mosely
c dmitri mendeleev
d antoine lavoisier
Answer:
i think it's C
Explanation:
But if it's wrong,im so sorry
Answer:
C.
Explanation:
the answer is C dmitri mendeleev
Which of the following electronic transitions in the oxygen atom will result in light emission?
A.n i= 1⟶nf = 2
B.n i= 1⟶nf =3
C. n i =3⟶n f =2
D. n i =2⟶n f =3
Answer:The answer is C. n i =3⟶n f =2
Explanation: I just take the test, I hope and helps, I know that is late.
Answer:
C. nᵢ = 3 ⟶ nᶠ = 2
Explanation:
Explain (not just list) where you observe reflection, refraction, and absorption of light in your everyday activities
Answer:
Reflection: you look in the mirror. Refraction: You put a straw in a glass of water, and it looks like it broke. Absorption: If you have a black sweater and you wear it out in the cold, the black sweater is going to hold in heat better than a lighter sweater because the black sweater absorbs light .
Why do molecular compounds have low melting points and low boiling points relative to ionic substances?
Answer:
The melting and boiling points of molecular compounds are generally quite low compared to those of ionic compounds. This is because the energy required to disrupt the intermolecular forces between molecules is far less than the energy required to break the ionic bonds in a crystalline ionic compound
A nucleus emits an alpha particle. What happens to the mass
number and the atomic number of that nucleus?
Answer:
the mass number decreases by 4 and the atomic number decreases by 2
Why is it necessary to heat the hydrate gently at first and then more strongly only after most of the water has been driven off
Answer:
To avoid spattering
Explanation:
If we are heating a hydrate to drive off the water of crystallization, we must initially heat the hydrate gently, at a lower temperature and then more strongly only after most of the water has been driven off in order to to prevent spattering.
Since we obtain the amount of water by the mass difference, Spattering decreases the mass of water obtained and ultimately results in a lower percent of water being calculated for the hydrate.
Cells are the basic units of
A. science
B. atoms
C. life
Answer:
C
Explanation:
Read it from my 8th grade text book a few years back.
Answer:
C l i f e
Explanation:
How is the Periodic Table helpful to scientists?
Answer:
Because it helps predict the types of chemical reactions that a particular element is likely to participate in by telling each element's atomic number and usually its atomic weight
Explanation:
What are the 2 basic parts of an atom?
Answer:
nucleus and electrons
Explanation:
nucleus contains protons and neutrons
What is the difference between enzyme and any other chemical catalyst?
Answer:
Enzymes and catalysts both affect the rate of a reaction. The difference between catalysts and enzymes is that enzymes are largely organic in nature and are bio-catalysts, while non-enzymatic catalysts can be inorganic compounds. ... Neither catalysts nor enzymes are consumed in the reactions they catalyze.
Explanation:
MARK ME
How would the reactivity of an element with one valence electron vary from an element with 8 valence electrons
Answer:
An element with 1only one valence electron is extremely reactive while an element with 8 valence electrons is very stable and does not react most of the times
Explanation:
Valency is the number of electrons in the outermost shell of the atom. It shows the ease with which elements react and combine with each other.
An element can take a maximum of 8 electrons in most of its outermost shells. As a matter of fact, the goal for its stability is to attain a structure with all 8 slots for electrons in its outer shell filled up. The element can either do this by adding or removing electrons.
The ease with which it adds or removes the electrons shows its reactivity. If it has only one electron to lose, (the valence electron) the element will be very reactive because this is relatively easier to do when compared with 2 electrons, three electrons, and so on. An element with 8 electrons in its outer shell is very stable and does not need to react anymore. an example of this is Neon and Argon.
during a heating or cooling process, how are changes in enthalpy and temperature related?
Answer:
answer this and ill answer that
Explanation:
during a heating or cooling process, how are changes in enthalpy and temperature related?
Describe the difference between cations represented on group 1/2(red and orange)and those found on the transition metal group(peach)
What is the molecular formula of a compound that contains 66% Ca and 34% P and
has a molar mass of 182.18 g/mol?
Answer:
Ca3P2
Explanation: find out what 66% of the molar weight of the molecule is and then find out how many moles of Ca that would be by dividing it by the molar weight of Ca
then do the same for P
1. Name the elements with the following symbols
a. Na
b. H
c. C
d. O
2. What is the symbol for the following elements?
a. Helium
b. Sulfur
c. Copper
d. Lead
Answer:
1.
a. Sodium
b.Hydrogen
c Carbon
d Oxygen
2.
a He
b S
c Cu
d Pb
Answer:
1.
a. Sodium
b.Hydrogen
c Carbon
d Oxygen
2.
a He
b S
c Cu
d Pb
Explanation:
Hope this will help
Which path shows how gravity causes water to move?
Answer:
run off
Explanation:
Answer: The answer is stream --> Tributary --> River --> Lake
4) Complete the following statement: Different elements...
A) Must have a mass number of at least 18.
B) Have more electrons than protons.
C) Have the same number of protons.
D) Have different numbers or protons.
1. The average person inhales an exhales about 2,200 L of O2 a day. How many
moles of oxygen gas is this?
Answer:4.5 moles
Explanation:
Temperatures in the upper atmosphere (thermosphere) reach 1500°C (2700°F), yet it does not produce
enough heat to burn you. Why?
if im not mistaken its because the ozone layer
need points & are good at science?
Answer:
A region 2
Explanation:
Which has the most effect on tides? *
2 points
Moon
Sun
Earthquakes
Wind
Submit
In the ATP cycle, a phosphate group is cut off of
A. ATP to form ADP, absorbing energy.
B. ATP to form ADP, releasing energy.
C. ADP to form ATP, absorbing energy.
D. ADP to form ATP, releasing energy.
Answer:
B) ATP to form ADP, releasing energy.
What is heat energy
Answer:
Explanation:
ok, so heat energy is a result to moving particles which are atoms molecules or ions in solids,liquids and gasses. And heat energy can be moved from an object to a other object. The transfer or the flow is different in temperature between the two different of objects which is called heat.
Hope this is useful!