Answer:
2.54 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1.52908 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
2.54 molesHope this helps you
what element has an electron
configuration of 2-8-8-1:
Which statement describes magnetic force?
O A. Every magnet has three poles.
O B. All materials are magnetic.
O C. Magnets can only repel each other.
O D. A north pole and a south pole attract each other.
Answer:
D. A north pole and south pole attract each other
Answer:
D
Explanation:
Find the density of an object with the mass of 14 g and volume of 2cm^3. O 28 g/cm O 7 g/cm O 1/2 g/cm 0 / 56 g/cm
Answer:
7 g/cm^3
Explanation:
Which salt would HI and NH4OH produce?
The mass of a bowling ball is 5 kilograms what is the mass of a bowling ball in grams?
The mass of the bowling ball in grams is 5000g
What is the mass of a bowling ball in grams?To convert the mass of a bowling ball from kilograms to grams, you can multiply the mass in kilograms by 1000, as there are 1000 grams in one kilogram.
Using metric system;
So, the mass of a 5-kilogram bowling ball in grams would be:
5 kilograms * 1000 grams/kilogram = 5000 grams
Therefore, the mass of a 5-kilogram bowling ball is 5000 grams.
Learn more on metric system here;
https://brainly.com/question/1837503
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Can someone please help me fill this out?
How will the volume of a gas be affected if the pressure is tripled, but the temperature remains the same?
Answer:
It is decreased to one third of its original volume
Explanation:
Type the chemical name of the compound that contains 1 copper atom, 1 oxygen
atom, and 1 hydrogen atom.
Answer:
Copper (I) hydroxide
Explanation:
Copper (I) hydroxide is a chemical compound with the chemical formula of CuOH. One copper atom (Cu), one oxygen atom (O), and one hydrogen atom (H.)
3. (05.04 MC)
What mass of Hy is needed to react with 8.75 g of Oz according to the following equation: 02(g) + H2(g) → H2O(g)? (4 points)
Answer:
1.10 g H2
Explanation:
what does "8 is great" mean as it pertains to valence electrons?
Answer:
stability and completely filled orbitals
Explanation:
As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.
For an atom to be stable, it must have completely filled outer orbitals. The number of electrons required is usually 8. This is the octet number which confers special stability on an atomic configuration. Elements having this number of electrons in their outer shell are unreactive.What is platonic plate boundary?
Best answer gets brain-list.
Answer:
Earth’s tectonic plates fit together in a jigsaw puzzle of plate boundaries.
The Earth’s outer shell, the lithosphere, consisting of the crust and uppermost mantle, is divided into a patchwork of large tectonic plates that move slowly relatively to each other. There are 7-8 major plates and many minor plates. Varying between 0 to 100mm per year, the movement of a plate is driven by convection in the underlying hot and viscous mantle.
Explanation:
How many molecules of H2O and O2 is present in 8.5g of H2O?
Answer:
2.8 x 10²³ molecules H₂O
1.4 x 10²³ molecules O₂
Explanation:
First, you will need the balanced chemical equation for the formation of water:
2H₂ + O₂ -> 2H₂O
This will help in determining the mole ratios between water and oxygen, which we will need later.
Let's first calculate the number of H₂O (water) molecules. This will require stoichiometry. We are also given the mass, so we must convert mass into moles, then moles into molecules. mass -> moles -> molecules
8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (6.02 x 10²³ molecules H₂O/1 mol H₂O) = 2.8404 x 10²³ molecules H₂O
Rounded to 2 significant digits: 2.8 x 10²³ molecules H₂O
Now, to find the molecules of water, we can begin with the same stoichiometric equation, but before we convert to molecules, we will have to convert moles of water to moles of oxygen. This is where we will use the mole ratio of water to oxygen we got from the balanced chemical equation earlier. 2H₂O:1O₂
8.5 g H₂O x (1 mol H₂O/18.01528 g H₂O) x (1 mol O₂/2 mol H₂O) x (6.02 x 10²³ molecules O₂/1 mol O₂) = 1.4202 x 10²³ molecules O₂
Rounded to 2 significant digits: 1.4 x 10²³ molecules O₂
14)
Air can be considered a mixture. Which statement helps describe air?
A) Air contains a fixed ratio of atoms.
B) The components of air separate into visible layers.
C) The components of air can be separated by chemical means.
D) The exact mixture of components varies from point to point.
Answer:
the components of air can be separated by chemical means
Answer:
D) The exact mixture of components varies from point to point.
Explanation:
Here's why: Air can be considered a homogeneous mixture.The exact mixture of components varies from point to point. Air is made up of individual elements and compounds. When near a cow pasture, you can smell the compounds associated with cow patties but you can not see these as separate from the rest of the air
An unknown substance kept in a sealed container at room temperature has a pressure of 2 atm. When the container was opened, the substance was exposed to normal atmospheric pressure, 1 atm. Which change did the substance most likely undergo?
Neither the temperature nor the volume will change.
The volume will decrease.
The volume will increase.
The temperature will increase.
Answer:
I took the test it's C.The volume will increase.
Explanation:
Since the pressure went down from 2 atm to 1 atm, the volume will go up! They are inversely related.
The change that the substance most likely underwent is that the volume will increase.
BOYLE'S LAW:
The relationship between the volume of a gas and its pressure is explained by Boyle's law. Boyle's law states that the volume is inversely proportional to the pressure of a given gas. This means that as the pressure of a gas increases, its volume also increases and vice versa. According to this question, an unknown substance kept in a sealed container at room temperature and a pressure of 2 atm changed to normal atmospheric pressure (1 atm). This depicts that the volume of the gas increased since the atmospheric pressure decreased.Learn more at: https://brainly.com/question/1437490?referrer=searchResults
6th grade science i mark as brainliest
Answer:
It's the 4th one. The car is accelerating gradually.
what does WHMIS mean?
Answer:
Workplace Hazardous Materials Information System
WHMIS is a short form for Workplace Hazardous Materials Information System. It is a comprehensive plan for providing information on the safe use of hazardous materials used in Canadian workplaces. Information is provided by means of product labels, material safety data sheets (MSDS) and worker education programs.
Answer:
Workplace Hazardous Materials Information System
Explanation:
can someone help me with science plz. Make a prediction: What do you think the petri dish will look like on Day 5?
Answer:
it would have some bacteria considering it would probs take up to 4-6 days for it to grow
Explanation:
What is the name of the compound represented by Ca3P2
A.) calcium Phosphite
B.) Tricalcium diphosphide
C.) Calcium Phosphate
D.) Calcium Phosphide
Answer:
Calcium phosphide (D)
Explanation:
Hope I helped^^
Can i please get brainliest
How many molecules are present in 3.09 mol of silicon dioxide, SiO2
There are 1.86 x 10²⁴ molecules of Silicon dioxide, SiO₂
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
Moles can also be determined from the amount of substance mass and its molar mass
1 mol = 6.02.10²³ particles
Can be formulated
[tex]\tt \boxed{\bold{N=n\times No}}[/tex]
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Given3.09 mol of Silicon dioxide, SiO₂
n=mol=3.09
Number of molecules :[tex]\tt N=n\times No\\\\N=3.09\times 6.02\times 10^{23}\\\\N=\boxed{\bold{1.86\times 10^{24}~molecules}}}[/tex]
All weather is energy in motion. Where does the energy come from
Answer:
The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy.
Explanation:
Answer:
"The Sun radiates huge amounts of energy. Only a small portion of that energy hits the Earth, but it is enough to light our days, heat our air and land, and create weather systems over the oceans. Most of the energy you will learn about comes from the Sun. The Earth also gives off energy."
By the way I got this off thee internet and copy and pasted it so don't write it just look and write in your own words please. Please do not copy and paste or write what i wrote because this is someone else's explanation or answer
Hope this helps!! Also please rank thank you.
Explanation:
A compound has the name iodine pentafluoride. What kind of bond is present between the atoms? A. O Metallic B Covalent C. Hydrogen D Ionic
Answer:
IF(subscript 5)
Explanation:
covalent.
The bond present between the iodine and fluorine in iodine pentafluoride has been a nonpolar covalent bond.
The intermolecular bonds between the atoms result in the stability of the compounds. The bonds formed between the atoms with the same electrical charge and less difference in the electronegativity have been the nonpolar covalent bonds.
The iodine and fluorine have been the halogen atoms with a negative charge and less difference in electronegativity. Thus, the bond present between the iodine and fluorine in iodine pentafluoride has been a nonpolar covalent bond.
For more information about the intermolecular interactions, refer to the link:
https://brainly.com/question/12025304
Boiling point and density are examples of
a) intensive properties
b) respective properties
c) reflective properties
d) extensive properties
Answer:
the answer is A
Explanation:
Explain why halogens have a higher first ionization energy than group 16 elements?
Explanation:
Halogens are elements found in the 7-th group on the periodic table. They are predominantly know for their electronegativity values and they have a high ionization energy.
Ionization energy is the energy required to remove the most loosely held electrons in an atom. Across a period, ionization energy is known to increase progressively from left to right. This due to the decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.Explain why a lithium ion (Li+) is smaller than a lithium atom (Li).
Answer:
Lithium ions are smaller than lithium atoms. This is because the lithium atom has 2 shells, while the ion just has one shell. Bromide ions are larger than bromine atoms, due to increased inter-electronic respulsion.
Explanation:
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In this stoichiometry problem, determine the limiting reactant:
Aqueous copper(II) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(II) sulfide as a precipitate. In this reaction 469 grams of copper(II) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate. Select all that apply.
The limiting reactant : Na₂S
Further explanationReaction
Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)
mol Cu(NO₃)₂ :(MW 187,56 g/mol)
[tex]\tt mol=\dfrac{469}{187.56}=2.5[/tex]
mol Na₂S :(MW 78,0452 g/mol)
[tex]\tt mol=\dfrac{156}{78.0452}=2.0[/tex]
Limiting reactant(smaller ratio⇒ between mol and coefficient) :
1 mol Cu(NO₃)₂ : 1 mol Na₂S , so the limiting reactant : Na₂S( 2 < 2.5)
Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium
Answer:
Barium, beryllium, and Strontium
Explanation:
These 3 elements are located in the same group, which determines the number of valence electrons.
The valence electrons determine how reactive an element will be.
A. →barium
B. silicon
C. aluminum
D. →strontium
E.osmium
F. →beryllium
Hope that this helps! :) :) :) :) :)
Predict the density of acetylene gas (C2H2) at 0.910 atm and 20oC.
Answer:
d = 0.98 g/L
Explanation:
Given data:
Density of acetylene = ?
Pressure = 0.910 atm
Temperature = 20°C (20+273 = 293 K)
Solution:
Formula:
PM = dRT
R = general gas constant = 0.0821 atm.L/mol.K
M = molecular mass = 26.04 g/mol
0.910 atm × 26.04 g/mol = d × 0.0821 atm.L/mol.K×293 K
23.7 atm.g/mol = d × 24.1 atm.L/mol
d = 23.7 atm.g/mol / 24.1 atm.L/mol
d = 0.98 g/L
Which of the following describes an ionic bond?
A.electrons are shared between non-metals.
B.electrons are gained by metals to become anions.
C.a cation attracts an anion.
D.a "sea of electrons" causes a lattice structure to form.
describe the whole process of Aluminum extraction from bauxite.
Answer:
Extraction of aluminium
Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.
Answer:
The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.
I know I am a little late answering this but I still wanted to answer the question for you . I am not good at explaining things so I copied and pasted but I hope this helps.
How do scientists determine whether a chemical reaction releases or stores energy
