Answer:
Principle quantum number.
Explanation:
Determine the mass defect for the following atom. The mass of a 20 Ne atom is 19.992 44 amu.
Answer:
I will not consider electronic mass here. We know (the masses should have been provided in the question!) that the neutron mass is
1.008701
⋅
amu
and the proton mass is
1.007316
⋅
amu
.
Explanation:
Question answered
What would be the temperature as well as pressure inside and outside of a can if it were to be placed in cold water?
Answer:
The hot gas molecules are the same pressure as the air outside the can. When the can is placed in cold water upside down, the hot gas water molecules are cooled very rapidly. ... Since the air pressure outside the can is stronger than that inside the can, it causes the can to collapse.
Explanation:
How many protons does Lithium have?
Answer:
3 ................................
Answer: 3
Explanation:
yes
The graph shows the average monthly rainfall for a
forested area.
In which month is a high alert for fire danger most
likely?
A. April
B. August
C. May
D. October
Answer:
The Answer would be A. April
Explanation:
Least amount of rainfall out of all the months we have to choose from.
A pizza is an example of a heterogeneous mixture. Explain why it is classified as such?
Answer:
Hi!
So, a homogeneous mixture is when the parts that make up the mixture are all mixed in perfectly evenly, so they're only appearing as one uniform substance.
In a heterogeneous mixture, the pieces are not evenly mixed. A pizza has separate parts, like the crust and toppings, so it's a heterogeneous mixture.
A student titrates 0.1719 g of an unknown monoprotic acid to the equivalence point with 21.85 mL of 0.1062 M NaOH. Which of the following is most likely to be the unknown acid? propionic acid (MM 74.08 g/mol) nitrous acid (MM 47.01 g/mol) chlorous acid (MM 68.46 g/mol) benzoic acid (MM 122.12 g/mol) lactic acid (MM: 90,08 gimol)
Answer:
Propionic acid
Explanation:
Step 1: Write the generic neutralization reaction
HA + NaOH ⇒ NaA + H₂O
Step 2: Calculate the reacting moles of NaOH
21.85 mL of 0.1062 M NaOH react.
0.02185 L × (0.1062 mol/L) = 2.320 × 10⁻³ mol
Step 3: Calculate the reacting moles of HA
The molar ratio of HA to NaOH is 1:1. The moles of HA are 1/1 × 2.320 × 10⁻³ mol = 2.320 × 10⁻³ mol.
Step 4: Calculate the molar mass of HA
0.1719 g of HA correspond to 2.320 × 10⁻³ moles.
MM = 0.1719 g/2.320 × 10⁻³ mol = 74.09 g/mol
With this molar mass, the most likely acid is propionic acid.
Chemical properties can be observed without changing the substance
Answer:
chemical properties can only be measured only by changing a substance chemical identity
Explanation:
apex
Pls help I dont get science so pls help me
Which of the following is true for polar jet streams?
They bring cool air.
They bring warm air.
They blow at the equator.
They blow from north to south.
Answer:
A: They bring cool air.
Explanation:
Took the test and got it correct. :)
Jet streams are fast flowing meandering air currents. Polar jet streams bring cool air through the atmosphere. Polar jets meet subtropical jets at some regions.
What are polar jet streams ?The polar jet stream, which travels through the lower layers of the atmosphere in the Northern Hemisphere, is a swiftly moving band of westerly winds.
The confluence of warm air ascending from the tropics and cold air masses descending from the arctic produces the jet. The denser cold air lowers and deflects the warmer air areas north, creating deep troughs and steep ridges that give the jet stream its wavy appearance.
As pockets of cold air intermittently sneak down from the Arctic, this pattern spreads across the mid-latitudes of North America, Europe, and Asia, producing opposing waves and flows that speed eastward due to the earth's rotation.
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Convert 3564 to Scientific Notation:
*
Answer:
3564 = 3.564 x 10^3
Explanation:
i.e expresing the value in standard form.
Substances which will glow in the dark after being exposed to sunlight are:
radioactive
photosensitive
luminescent
phosphorescent
Answer:
If something glows in the dark it is phosphorescent.
When all colors of light are absorbed, what do you see?
Black
Orange
Pink
Yellow
Answer:
Black
Explanation:
hope it helps
have a nice time ..,
Who would most likely be required to work with sodium hydroxide?
a plumber
a gardener
a bricklayer
a mechanic
Answer:
i think plumber
Sodium hydroxide is generally referred to as caustic soda used in soaps and cleaners. A plumber would most likely be required to work with sodium hydroxide. Hence, option A is correct.
What is the use of sodium hydroxide?
Soaps, paper, explosives, dyes, and petroleum are all made with sodium hydroxide. The presence of sodium hydroxide in a cleanser or a homemade aqueous solution converts these disconcerting fats into soaps, which are easily removed by water.
They have no odor and no color making them react with water and strong acids to produce salts. They are considered ionic compounds with sodium cation and chloride anion. They also are used in oxide coating and cleaning of metals.
Therefore, option A. plumber will most likely use sodium hydroxide.
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Can someone please help?
Answer:
On Question 3
Explanation:
try using any type or liquid like water, milk, soda, juice, coffee, tea, beer, or wine or any type and use the following questions by using a measuring cup from the kitchen tooling shelf. Use that to answer the question and see if that helps. your welcome btw
chemistry question please help
Answer:
AR(18)
Explanation:
Try that it should work
*(
Lars observes a substance to be a solid and to float in water at room temperature (23°C). Based on the given properties, which substance is the most likely identity of this sample?
Substance Melting Point (°C) Boiling Point (°C) Density at Room Temperature (g/cm3)
carbon tetrachloride -22.9 76.7 1.59
cetyl alcohol 49.3 344 0.811
dichlorobenzene 53.5 174 1.25
sulfur hexafluoride -64 -50.8 0.00617
A.
carbon tetrachloride
B.
cetyl alcohol
C.
dichlorobenzene
D.
sulfur hexafluoride
Answer:D. Sulfur Hexafluride
Explanation:
D. Sulfur Hexafluride
Explanation:
above it says the substance floats above water at room temperature and lists some substances and their density at room temp!
we know that the density of water is 1.0 so the substance in order for it to float has to be less than 1.0 and the densities for Sulfer Hexa, are all less than 1!!
If the titration of 0.8094 g of 100% pure
KHP requires 40.25 mL of NaOH, what
is the concentration of the NaOH
solution? Remember KHP is potassium
hydrogen phthalate, KHC2H4O4. Show
this calculation in your lab notebook.
Answer:
Explanation:
molecular weight of potassium hydrogen phthalate = 204
.8094 g of KHP = .8094 / 204 = 3.967 x 10⁻³ moles
3.967 x 10⁻³ moles of KHP must have reacted with 3.967 x 10⁻³ moles of NaOH
concentration of NaOH = 3.967 x 10⁻³ / 40.25 x 10⁻³
= .098 M .
Is br a magnetic or non magnetic
Answer: Non-magnetic
Explanation:
Answer:
br is a non magnetic. hope this helps.
If 2.1 mL of 70.0% alcohol is added to 6.7 mL of water, what is the percent alcohol (%v/v) in the new mixture?
Answer:
Since we are adding more water to an alcohol solution,
the volume of alcohol in the alcohol will be the same but the volume percent of alcohol will decrease
Initial Volume of Alcohol in the solution:
We are given that 70% of the 2.1 mL solution is alcohol
So, Finding 70% of 2.1
70/100 * 2.1 = 1.470 mL alcohol
Volume of Water in the Solution:
In our initial solution, we have (2.1 - 1.47) mL water
and we add an additional 6.7 mL water in the solution
Hence,
the total amount of water in the solution = (2.1- 1.47) + 6.7
Total amount of water in the solution = 0.63 + 6.7
Total amount of water in the solution = 7.33 mL
Volume of the final solution = 8.8mL
Percent Alcohol in the new mixture:
Now that we know the volume of alcohol and the volume of water in our mixture, we can now find the percent composition of alcohol
Percent of alcohol (%v/v) = Amount of alcohol / 100mL of solution
Percent of alcohol = (1.47 / 8.8) * 100
Percent of alcohol = 0.167 * 100
Percent of alcohol = 16.7
Therefore, in a 100mL solution, we will have 16.7 mL alcohol
Which of the elements listed below would
require the least amount of energy to remove an
electron?
Beryllium
Calcium
Lithium
Sodium?
Answer:
Lithium would require the least amount of energy to remove an electron
Answer:
The answer is actually sodium
Explanation:
Lithium actually requires more than sodium.
Which statement accurately describes the atoms of a specific element? *
An indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus.
A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus.
An aluminum, Al, contains 27 electrons and 27 protons inside the nucleus.
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus
Answer:
the last one, (A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus)
A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus accurately describes the atoms of a specific element ,therefore option (d) is correct.
What are the characteristics of zinc element ?Zinc is placed in group 12 of the periodic table. It is in the first period of transition or d block elements, and fourth period of the periodic table.
Zinc is a metal. It has two valence electrons that are lost easily. Zinc forms positive ions with 2+ charges, like the metals of the alkaline earth family.
Uses of zinc element -:
Zinc is an important trace element for human beings. Zinc is used for making brass, an alloy of copper and zinc.Zinc is used as the anode in dry cells.A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus accurately describes the atoms of a specific element ,hence option (d) is correct.
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Pls help I am confused my sister got me sweating
Answer:
Im pretty sure its B. is released by salivary glands.
Explanation:
PLEASE HELP ASAP‼️ Which of the following elements has the highest metallic character
A. Zt
B. Rh
C. Hf
D. Co
Answer: C
Explanation:
What’s it called when a sound wave is slowed down by a new medium?
Answer:
Refraction of waves involves a change in the direction of waves as they pass from one medium to another. ... Sound waves travel slower in cooler air than they do in warmer air.
Explanation:
How many grams of lithium hypochlorite (LiClO) are there in 0.649 mol ?
Answer:
37.9 or 38 grmas approximately
Velocity is
is a given
O distance, time
O speed, displacement
O speed, direction
3.) Why is argon (Ar) larger than neon (Ne)?
Answer: Here u go!
Explanation:
The electron cloud of argon is thus larger and more polarized, able able to express mawr inter molecular forces Vander Waals forces, which results in a higher boiling point due to these increase forces. Due to this, the boiling point of argon is higher are gone. We can see its boiling point is 87.2 Kelvin's, whereas a neon and spoiling point is 24.5.
Hope this helps!
Explanation:
Argon has an atomic number of 18, while neon has an atomic number of 10.
The atomic radius is comprised of the atom’s nucleus and electron cloud. As you go down on the periodic table, the effective nuclear charge decreases. This results in more screening of the electrons
from the nucleus (decreasing the attraction between the nucleus and the electrons) resulting in a larger atomic radius.
However, because they’re both noble gasses, the size difference in this case can be easier described by the number of particles in each atom.
Argon has 18 protons, 18 electrons and 22 neutrons.
Neon has 10 protons, 10 electrons and 10 neutrons.As you can see, argon has more “stuff.”
The increase in protons and electrons in particular results in a larger electron cloud, which means a much larger atomic radius than in neon.
i hope it helps u :)
which gas is the most dense under standard temperature and pressure?
A. H2
B. Ne
C. Ar
D. O2
Answer:
I think it's b: ne
Explanation:
its just a wild guess
Which is the larger atom S or Mg
Answer:
Mg
Explanation:
If one were comparing just the neutral atoms Mg and S, the S atom would be smaller as both elements are in the same period and sulfur is more to the right
How for way is the Neptune from the sun