Answer:
the anion OH having one oxygen and one hydrogen atom.
Explanation:
During an endothermic reaction, heat is
Answer:
Absorbed during the above reaction.
Explanation:
It is lowering the temperature of the reaction mixture, and thus the reaction flask feels cold.
Answer:
Endothermic reaction: absorbs heat from its surroundings.
Explanation:
"Endo" means inside. "Thermic" refers to heat.
What's the actual size of an atom?
Why does the amount of protons change the atom but not the neutrons?
Are we able to "edit atoms" and create new elements
what happens when an atom becomes too positively charged or negatively charged
Answer:
1.An atom is the smallest constituent unit of ordinary matter that constitutes a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers ( 1 × 10−10 m, a ten-millionth of a millimeter, or 1/254,000,000 of an inch).
3.New elements aren't exactly discovered anymore. However, they can be made, using particle accelerators and nuclear reactions. A new element is made by adding a proton (or more than one) to a pre-existing element. This can be done by smashing protons into atoms or by colliding atoms with each other.
4.If an atom gains an electron, it becomes negatively charged.
If an atom loses an electron, it becomes positively charged.
which element has a stronger Zeff (effective nuclear change) Na or Rn and why?
Answer:
chlorine
Explanation:
Because chlorine is in the same period as phosphorus and sodium, but has the most protons in its shell (the most right within the same period) it has the greatest effective nuclear charge.
Help please!!!! I only have a couple mins
Answer:
D i am prety shure
Explanation:
Answer:-D
Explanation:
1. Newton's second law says how quickly an object accelerates is directly
related to the mass of the object and the
O length of the object
O location of the object
O the force applied to it
O direction the object is going
Answer:
An objects accelarates in the same direction as that of the force applied.
Explanation:
5. A piece of copper metal is correctly placed on a triple
beam balance. The riders are all at the zero mark
except for the rider on 0-10 gram beam which is
located at the position shown.
5 6
What is the mass of the copper metal?
A) 0.455 g
B) 4. 56 g
C) 0.55 g
D) 5.50 g
5. What volume of silver metal will weigh exactly 4500.0 g. The density of silver is 20.5 g/cm.
Answer:
The answer is
219.5 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 4500 g
density = 20.5 g/cm³
We have
[tex]volume = \frac{4500 }{20.5} \\ = 219.51219...[/tex]
We have the final answer as
219.51 mLHope this helps you
An atom has 6 protons, 6 neutrons, and 6 electrons. What is the charge of the atom's
nucleus?
Explanation:
Carbon-12 (12C) is the more abundant of the two stable isotopes of carbon (carbon-13 being the other), amounting to 98.93% of the element carbon;[1] its abundance is due to the triple-alpha process by which it is created in stars. Carbon-12 is of particular importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 protons, 6 neutrons, and 6 electrons.
How is the density of an object calculated?
Dividing the object’s volume by its mass
Multiplying the object’s mass and volume
Multiplying the object’s volume and weight
Dividing the object’s mass by its volume
Answer:
Divide its mass by the volume.
Explanation:
Ionic solids have high values of enthalpy of fusion. Why?
why was alchemy so confusing?
What is the macroscopic, nanoscopic, and symbolic level of sulfur?
Answer:
these are small organism that can not seen by naked eyes
A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element?
Answer: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element?
Explanation: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element? 74.92 amu. Use your periodic table to determine which element this is. As. An element exists
The average atomic mass of the element is 74.93 amu
Let the 1st isotope be A
Let the 2nd isotope be B
Let the 3rd isotope be C
From the question given above, the following data were obtained:
For A (i.e 1st isotope)Abundance of A (A%) = 24.1%
Mass of A = 75.23 amu
For B (i.e 2nd isotope)Abundance of B (B%) = 48.7%
Mass of B = 74.61 amu
For C (i.e 3rd isotope)Abundance of C (C%) = 27.2%
Mass of C = 75.23 amu
Average atomic mass =?The average atomic mass of the element can be obtained as follow:
Atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100] + [(mass of C × C%)/100]= [(75.23 × 24.1)/100] + [(74.61 × 48.7)/100] + [(75.23 × 27.2)/100]
= 18.13043 + 36.33507 + 20.46256
Average atomic mass = 74.93 amuThus, the average atomic mass of the element is 74.93 amu
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A block of lead displaces a volume of 27.9 mL. What is the mass of this block if the density of the lead is 11.34 g/mL?
Answer:
The answer is 316.39 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of lead = 27.9 mL
density = 11.34 g/mL
We have
mass = 11.34 × 27.9 = 316.386
We have the final answer as
316.39 gHope this helps you
Lewis Dot Structure for Helium
(He)
Answer:
Hydrogen, symbol H, has 1 valence electron, Lewis structure is H. Helium, symbol He, has 2 valence electrons, Lewis structure is He: With helium, the first energy level (K shell) is full.
The Lewis dot structure for He has been shown in the image attached.
What is the Lewis dot structure?The general shape of a molecule and the number of bonds an atom can make can both be determined using Lewis structures. They provide a visual representation that aids in understanding chemical bonding and predicting the reactivity and other properties of molecules.
The three-dimensional form of molecules, molecular orbitals, or the presence of lone pairs of electrons are all ignored in Lewis structures, which are simplified models. Making this distinction is essential.
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what is the density of an object has a mass of 10 G volume of five CM^3
Answer:
The answer is 2.0 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 10 g
volume = 2 cm³
We have
[tex]density = \frac{10}{5} \\ [/tex]
We have the final answer as
2.0 g/cm³Hope this helps you
plss help meeeeeeee i need help
Answer:
D: dark cloud
E: elliptical galaxy
F: flare star
plsssssss! help! 20 points
A sample of N2H4 has a mass of 25g. Identify the numerical quantity that is needed to convert the number of grams of N2H4 to the number of moles of N2H4. (You do not need to do the actual calculation.)
Answer:
Explanation:
molecular weight of N₂H₄ is as follows
2 x 14 + 4 x 1 = 32
so 32 gram of N₂H₄ is equal to one mole of N₂H₄
25 gram of N₂H₄ will be equal to 25 / 32 mole of N₂H₄
so numerical quantity needed to convert grams of N₂H₄ to mole is
1 / 32 or .03125 . This number needs to be multiplied with grams of N₂H₄
to convert it to number of moles.
Answer:
The answer is molecular mass.
Explanation:
In order to convert grams to moles. you have to find the molar mass of N2H2.
Find the mass of an object that has a volume of 6.0 cm ³ and density of 3.3 g / ml.
Answer:
The answer is 19.8 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 6 cm³
density = 3.3 g/cm³
We have
mass = 3.3 × 6
We have the final answer as
19.8 gHope this helps you
How many nonreactive elements are there in the periodic table??
Answer:
6
Explanation:
All noble gases are nonreactive, these include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
Answer:
18 elements are nonreactive in the periodic table
What do you call all water on earth surface
Answer:
Hydrosphere
Explanation:
Hydrosphere includes all water on the surface of the planet.
Answer:
Hydrosphere
Explanation:
cuz i said so
Why is melting ice cream a physical?
Melting ice cream is a physical change because it is a phase change, the water in the ice cream gains thermal energy and the inter-molecular forces are overcome and the molecules move further apart forming a liquid. It is not a chemical change because no chemical reactions occurred.
Compute the heat involved when 42.8 grams of calcium carbide, CaC2 cools from 74.2 c to 11.5 c
What is the formula for hydrosulfuric acld?
HSO 2
H252
H 2 SO 2
H2S
How much HNO3 can be made from 25.0 g of NO2 according to the following reaction?
Answer:
1. Find the molar mass of NO2 (46.01)
2. Find the number of moles in 25 g of NO2 (by dividing 25 by the molar mass) 25/46.01 = .54
3. For every 3 moles of NO2 there are 2 moles of HNO3. multiply the number of moles of NO2 by 2/3
.54 x 2/3 = .36
4. Finally, multiply this number by the molar mass of HNO3 (63.018)
.36 x 63.018 = 22.68 g HNO3
Explanation:
The statement, that describes the mass of HNO₃ can be made from mass of NO₂ is "17.1 gram".
What is mass?A substance is something to do with mass that takes up space. The mass of a compound is the total amount of atoms present in grams that make up a molecule. The grams is the unit of mass. In order to determine the mass in grams, divide the given mass of the substance value by its molar mass to convert gram into mole.
What is gram?The mass about one cubic centimeter of distilled water at 4°C would be used to describe the gram as a unit.
Gram to mole conversion factor,
[tex]= grams\;*\;\frac{1\;mol}{grams}[/tex]
The balanced chemical equation comes out to be, 2NO₂ + H₂O → HNO₂ + HNO₃
Using the above equation, the moles of NO₂ can be determined from the given mass,
[tex]= \frac{given\;mass}{molar\;mass}\\= 25.0\;g\;*\;\frac{1\;mol}{46.005\;g} \\= 0.5434\;mol Now, HNO_{3} can be made from 25.0 g of NO2= 0.5434\;mol\;NO2\;*\;\frac{1\;mol\;HNO3}{2\;mol\;NO2}\;*\;\frac{63.01\;g\;HNO3}{1\;mol\;HNO3} \\= 17.119\;g\;HNO3\\=17.1\;g\;HNO3[/tex]
Hence the correct answer is 17.1 gram.
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Which of the following is an accurate definition of power?
Answer:
the ability to do something or act in a particular way, especially as a faculty or quality.
Explanation:power, authority, jurisdiction, control, command, sway, dominion mean the right to govern or rule or determine. power implies possession of ability to wield force, authority, or influence. the power to mold public opinion authority implies power for a specific purpose within specified limits.
Which would show an example of how physical changes are reversible?
A. cutting a gold bar in two pieces and then putting the pieces next to each other
B. burning a match and then relighting it
C. melting tin and then cooling it into a mold
D. combining sodium and chlorine to make the new material of table salt
Answer:
C) the tin one
Explanation:
because its the same substance, it was just heated and formed into a new shape.
What number need to go in front of ty HCI to balance the equation?
3H2 + 3Cl2 - ?HCI
Which name identifies the acid HBr?
A) hydrogen bromine acid
B) hydrousbromide acid
C) broom is acid
D) hydrobromic acid
Answer:
A
Explanation:
What word is not associated with Exothermic? A)absorbs energy B )burning firewood C )freezing water D) releases energy
Answer:
C
Explanation:
Answer:
D
Explanation:
Not a because the term exo means outward, so exothermic means releasing energy so D.
Not B or C because they have nothing to do with exothermic (exo- outward thermic- energy)