Answer:
whether the molecule is formed from at least two atoms
Explanation:
A feature that distinguishes an elemental molecule and a compound molecule is whether the molecules are formed from at least two atoms.
An elemental molecule is a molecule that contains two or more of the same kind of elements.
A compound molecule contains two or more different kinds of molecules.
An example of elemental molecule is oxygen gas, O₂. An example of a compound molecule is water H₂O.A molecule is a unit of a compound that can represent such a compound.
Therefore, what distinguishes an elemental molecule from a compound molecule is whether a molecule forms from at least two atoms.
how many atoms are in 20 grams of aluminum
Answer:
4.5 × 10²³ number of atoms Al
Explanation:
Given data:
Mass of Al = 20 g
Number of atoms of Al = ?
Solution:
The given problem will solve by using Avogadro number.
'It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance" .The number 6.022 × 10²³ is called Avogadro number.
We will calculate the number of moles of Al first:
Number of moles = mass/molar mass
Number of moles = 20 g/ 27 g/mol
Number of moles = 0.74 mol
1 mole = 6.022 × 10²³ number of atoms
0.74 mol × 6.022 × 10²³ number of atoms / 1 mol
4.5 × 10²³ number of atoms Al
The required number of atoms is [tex]4.46\times 10^{23}[/tex]
Atomic Weight:Atomic weight, also called relative atomic mass, ratio of the average mass of a chemical element’s atoms to some standard.
Given that,
Mass=[tex]20[/tex] grams
1 mole of aluminum [tex]= 27g = 6.023\times10^{23}[/tex] number of atoms 27g of aluminum contains [tex]6.023\times10^{23}[/tex] a number of atoms.
Therefore,20 grams the number of atoms is,
[tex]6.023\times10^{23}\times\frac{20}{27} =4.46\times10^{23}[/tex]
Learn more about the topic of atomic weight:
https://brainly.com/question/13399225
the male and female sex cells combine to form a
Answer:
zygote
Explanation:
In human beings, each gamete contains 23 chromosomes, half the number found in the other cells of the body. When the male and female gametes fuse, they become a zygote containing the full 46 chromosomes, half of which came from the father and half from the mother.
Answer:
zygote
Explanation:
In human beings, each gamete contains 23 chromosomes, half the number found in the other cells of the body. When the male and female gametes fuse, they become a zygote containing the full 46 chromosomes, half of which came from the father and half from the mother.
X-ray crystallography is used to see the structure of molecules. Scientists have used this technique to find the structure of cholesterol, an important biological molecule.
Knowledge of the structure of cholesterol is helpful because it may affect
A. how cholesterol works in the body.
B. the amount of cholesterol that is considered healthy.
C. previous ideas about which foods contain cholesterol.
D. previous explanations of how cholesterol works in the body.
Answer:
A. how cholesterol works in the body.
Explanation:
If we know the precise structure of a molecule (by X-ray crystallography), we can understand more about how it interacts with cells, proteins, and other molecules. It can also tell us what reactions it might take part in.
Therefore, we can learn more about how it works in the body and what activities it takes part in in the cells of the body.
Answer:
A
Explanation:
nuityyy
What is the energy of a photon of red light having a frequency of 3.08 x 10^14 HZ?
Answer:
2.04 x 10⁻¹⁹J
Explanation:
Given parameters:
Frequency = 3.08 x 10¹⁴Hz
Unknown:
The energy of the photon = ?
Solution:
The energy of a photon is given as;
E = hf
Where h is the planck's constant
f is the frequency
Insert the parameters and solve;
E = 6.63 x 10⁻³⁴ x 3.08 x 10¹⁴
E = 20.4 x 10⁻³⁴⁺¹⁴
E = 20.4 x 10⁻²⁰ = 2.04 x 10⁻¹⁹J
Answer:
2.97*10-19 j
Explanation:
E=Energy of photon
H=Planck constant=6.626*10-34
V=Frequency of photon
we can plug what we already know E=(6.626*10-34)(4.48*10 14)
A solution contains 90 mL of methanol, 18 mL of propanol, and 2 mL of diethyl ether. Which is the solvent in this solution?
Answer:
Methanol
Explanation:
How do changes in population size relate to environmental conditions?
Answer:
No simple relationship exists between population size and environmental change. However, as global population continues to grow, limits on such global resources as arable land, potable water, forests, and fisheries have come into sharper focus.
Explanation:
how would you represent a sulfur isotope that contains 18 neutrons using the format
Answer:
S–34
Explanation:
From the question given above, the following data were obtained:
Neutron number = 18
The isotope of sulphur still retains its atomic number of 16.
Recall:
Atomic number = proton number
Atomic number of sulphur (S) = 16
Therefore,
Proton number = 16
Next, we shall determine the mass number of the sulphur isotope. This can be obtained as follow:
Proton number = 16
Neutron number = 18
Mass number =.?
Mass number = Proton + Neutron
Mass number = 16 + 18
Mass number = 34
The symbol for sulphur is S.
Thus, the symbol of sulfur isotope that contains 18 neutrons is S–34
Use the periodic table to determine the electron configuration for aluminum (Al) and arsenic (As) in noble-gas notation.
Al:
[Ar]3s23p1
[He]2s22p63s23p1
[Ne]3s23p1
[Ne]3s23p2
Answer:
C
Explanation:
[Ne]3s23p1
Answer:
C
Explanation:
how many oxygen atoms are there in six dinitrogen monoxide molecules? express your answer as an integer
Answer:
6 oxygen atoms
Explanation:
Step 1: Given data
Number of dinitrogen monoxide molecules (N₂O): 6
Number of oxygen atoms (O): ?
Step 2: Calculate the appropriate ratio
The ratio of dinitrogen monoxide molecules to oxygen atoms is 1:1.
Step 3: Use the ratio to calculate the number of oxygen atoms
6 molecule N₂O × (1 atom O/1 molecule N₂O): 6 atom O
Which option(s) correctly shows an anion? Select all that apply.
Answer:
x
Explanation:
becaue neutron equal to mass num -atomic num
Plz help don’t understand.
Answer:
the last one i think
Explanation:
At STP, a 50-gram sample of H20(I) and a 100-gram sample of H20(I) have
Answer:
(1) the same chemical properties .
Explanation:
Hello!
In this case, among the options:
(1) the same chemical properties
(2) the same volume
(3) different temperatures
(4) different empirical formulas
We can see that they have the same chemical properties as they at the same conditions, same type of bond (polar), molecular geometry, bond angle (104.5 °) and so on. Nevertheless, at STP (1 atm and 273.15 K) they do not have the same volume since the larger the mass, the larger the volume, they have the same temperature and the both of them are H₂O.
It means that the answer is (1) the same chemical properties .
Best regards.
Which best describes the purpose of a controlled experiment?
to make sure the results of the experiment support the hypothesis
to prevent a dangerous condition resulting from a reaction
to examine whether one variable causes a change in another
to prevent an undesired change in a variable
Answer: To examine whether one variable causes a change in another
Explanation:
How many electrons are in the 4p orbital does Br possesses?
Answer:
5 electron
It contains 6 electrons in 2p orbital, 6 electrons in 3p orbital and 5 electron in 4p orbital.
You are given a sample of a Group II metal chloride, but the identity of the metal is unknown. Knowing that all Group II metal chloride compounds have the general formula, MCI2 and that the percentage of chlorine in the compound is 34.1%, what is the identity of the unknown substance?
Answer:
The identity of unknown substance is Barium.
Explanation:
The given compound has a formula of MCl2. And the percentage of chlorine in this compound is said to be 34.1 %. But, we know that the mass of chlorine in this compound is, 35.5*2 = 71 g
Therefore, if we let x be the total mass of the compound, then:
34.1% of x = 71 g
(0.341)x = 71 g
x = 71 g/0.341
x = 208.2 g
Hence, the mass of other atom M, must be:
M = x - 71 g
M = 208.2 g - 71 g
M = 137.2 g
Now, we look into periodic table in group II. We find that the element is Barium with atomic mass of 137 g.
The identity of unknown substance is Barium.
Barium forms a metal chloride whose percentage of chlorine is 34.1 %. The unknown substance is barium chloride.
We have a Group II metal chloride with a general formula MCl₂. The molar mass of Cl⁻ is 35.45 g/mol. The mass of 2 moles of Cl⁻ is:
[tex]2 mol Cl^{-} \times \frac{35.45g Cl^{-} }{1mol Cl^{-} } = 70.90g Cl^{-}[/tex]
70.90 g represents 34.1% of 1 mole of MCl₂. The molar mass of MCl₂ is:
[tex]70.90gCl^{-} \times \frac{100gMgCl_2}{34.1gCl^{-} } = 208gMgCl_2[/tex]
208 g of MCl₂ contains 70.90 g of Cl⁻. The mass of M²⁺ in 1 mole of MCl₂ is:
[tex]mMCl_2 = mCl^{-} + mM^{2+} \\\\mM^{2+} = mMCl_2 - mCl^{-} = 208g-70.9 g = 137.1 g[/tex]
Barium has a molar mass of 137.3 g/mol, so M must be barium. The unknown substance is barium chloride.
Barium forms a metal chloride whose percentage of chlorine is 34.1 %. The unknown substance is barium chloride.
Learn more: https://brainly.com/question/5394922
How is color a physical change
Answer:Physical changes involve states of matter and energy. No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.
Explanation:
Forces are measured in
Newton
Watt
Mass
Grams
Answer:
A
Explanation:
Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol F.
2.54 mL of ethanol to mol ethanol (Hint: the density of ethanol is 0.789
g/mL.)
0.04350179862
Explanation:
Make sure to check for sig figs though. Basically, you have 2.54 mL and you multiply that by the 0.789 g/mL and mL cancels out and you are left with 2.00406g. There are 46.06844 grams per mol of ethanol, so to cancel out grams we multiply by 1/46.06844. And then we are left with 0.04350179862 mol
Which will have both the highest ionization energy and the largest atomic
radius? Potassium, Bromine, Krypton
Answer:
Bromine
Explanation:
Cuz it has bro in it :)
4. Solve the following heat flow problem, being sure to show all your work (you may either type your
work or insert an image): Find the specific heat of 402 grams of graphite that absorbs 1136) of heat
energy as it changes temperature from 26°C to 30°C.
Answer should be 0.7J/gC
Answer:
0.70 J/g.°C
Explanation:
Step 1: Given data
Mass of graphite (m): 402 gHeat absorbed (Q): 1136 JInitial temperature: 26°CFinal temperature: 30 °CSpecific heat of graphite (c): ?Step 2: Calculate the specific heat of graphite
We will use the following expression.
Q = c × m × ΔT
c = Q / m × ΔT
c = 1136 J / 402 g × (30°C - 26°C)
c = 0.70 J/g.°C
A conclusion in science states whether or not a hypothesis is correct
or not?
Answer:it do not states
Explanation:
What happens during a chemical reaction? Where do the reactants go, and where do the products come from?
What is the density of Radon (Rn) gas at a temperature of 100°C and a pressure of 0.75
atm?
Answer:
Density of Radon is 5.44 g/.
Explanation:
Given data:
Temperature of gas = 100°C (273+100 = 373 K)
Pressure of gas = 0.75 atm
Density of gas = ?
Solution:
First of all we will derive the formula.
We know that,
PV = nRT
and
n = m/M (m = mass, M = molar mass)
PV = (m/M) RT
PVM = (m/M) RT ×M
PVM = mRT
PVM/V = mRT/V
PM = dRT (m/V = d)
Now we will put the values in formula:
Molar mass of Radon is 222 g/mol .
0.75 atm ×222 g/mol = d× 0.0821 atm.L/mol.K ×373 K
166.5 atm.g/mol = d×30.62 atm.L/mol
d = 166.5 atm.g/mol / 30.62 atm.L/mol
d = 5.44 g/L
The basis of the VSEPR model of molecular bonding is __________. Question 1 options: atomic orbitals of the bonding atoms must overlap for a bond to form regions of electron density in the valence shell of an atom will arrange themselves so as to maximize overlap electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions regions of electron density on an atom will organize themselves so as to maximize s-character Question 2 (1 point)
Answer:
Electron domains in the valence shell of an atom will arrange themselves so as to minimize repulsions
Explanation:
In accordance with VSEPR theory, the electron domains or electron pairs on the valence shell of the central atom in a molecule always position themselves as far apart in space as possible in order to minimize repulsions.
Recall that according to VSEPR theory, the shape of a molecule depends on the number of electron pairs or electron domains on the valence shell of the central atom of the molecule, both lone pairs and bond pairs. Lone pairs are known to cause more repulsions than bond pairs.
Selenium-81 has an abundance of 21.91% and a mass of 80.65 amu.
Selenium-84 has an abundance of 23.35% and a mass of 83.67 amu.
Selenium-80 has an abundance of 54.74% and a mass of 79.64 amu.
What is the average atomic mass of Selenium according to these values?
Answer:
80.80amu
Explanation:
multiple each value by its percentage (in decimal form) and take the sum.
80.65x.2191 + 83.67x.2335 + 79.64x.5474 = 80.802296 sig figs = 80.80
What changes a liquid to a gas?
Answer:
evaporation
Explanation:
Answer:
boiling (or vaporization)
Explanation:
At a certain temperature, the particles in a liquid have enough energy to become a gas. This process of a liquid becoming a gas is called boiling (or vaporization.)
Calculate the molarity of a solution prepared by dissolving 0.20 mol of KNO3 into enough water to make 250 mL of solution. ______ M
Answer:
0.8M
Explanation:
Given parameters:
Number of moles of KNO₃ = 0.2mol
Volume of KNO₃ = 250mL
Unknown:
Molarity of the solution = ?
Solution:
The molarity of a solution is the number of moles in a given volume of a solution;
Molarity = [tex]\frac{number of moles }{volume}[/tex]
We need to convert the given volume to L;
1000mL = 1L
250mL will give 250 x 10⁻³L = 0.25L
So;
Molarity = [tex]\frac{0.2}{0.25}[/tex] = 0.8M
Answer:
0.8 M
Explanation:
The formula is mol divided by liters. Converting 250 ml to .25 liters is important. Dividing .2 by .25 gets the answer. (I swear it’s right but it’s graded wrong so take this with a grain of salt)
CHEMISTRY! 50 POINTS! What is the original pressure of 20.0L of compressed gas if the pressure changes to 560.0mmHg when the volume is decreased to 15700mL?
Answer:
The answer is 439.60 mmHgExplanation:
To find the original pressure we use the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the original pressure
[tex]P_1 = \frac{P_2V_2}{V_1} \\[/tex]
From the question
V1 = 20 L = 20,000 mL
P2 = 560.0mmHg
V2 = 15700mL
We have
[tex]P_1 = \frac{560 \times 15700}{20000} = \frac{8792000}{20000} = \frac{2198}{5 } \\ [/tex]
We have the final answer as
439.60 mmHgHope this helps you
Active and inactive volcano in philipines?
355 volcanoes in the Philippines are inactive.
24 volcanoes are active
Answer:
TAAL ACTIVE
MAOUNT BALUGAO INACTIVE
Explanation:
Which of the statements below about buoyancy is true?
A.if the buoyant force is greater than the force of gravity,the object will sink
B.buoyancy is a force that acts on objects that are placed in a fluid
C.all objects that experience the force of buoyancy float
D.buoyancy pushes objects down in the same direction as gravity
(answer asap plz I will give brainliest to who helps me )
Answer:
it's A. if the force of gravity is greater than the buoyant force, the object will sink.
Explanation:
just took the quiz on a p e x
