Answer:
True
Explanation:
Ice floats on water, for water is more dense than ice, allowing water to "support" the ice on top.
Iron nail, on the other hand, is more dense than water, allowing the nail to sink.
Answer: True an iron nail is more dense than the water and Ice the ice is less dense than the water making it float. Hopes this helps :)
What is the molarity of a solution prepared by diluting 250 mL of a 40% H2SO4 solution to 1 Liter? The density of the stock solution is 1.17 g/mL
To calculate the molarity of the diluted H₂SO₄ solution, first find the mass of H₂SO₄ in the initial solution. Convert this mass to moles and divide by the final volume in liters. The resulting molarity is 1.194 M.
To find the molarity of the diluted sulfuric acid solution, follow these steps:
Calculate the mass of H₂SO₄ in the initial solution:
A 40% H₂SO₄ solution means there are 40 grams of H₂SO₄ in every 100 grams of solution. The density of the stock solution is 1.17 g/mL, so 250 mL of stock solution weighs :
250 mL × 1.17 g/mL = 292.5 g.
Mass of H₂SO₄: 40% of 292.5 g = 0.40 × 292.5 g = 117 g H2SO4.
Calculate the moles of H₂SO₄:
Molecular weight of H₂SO₄ (H: 1 g/mol, S: 32 g/mol, O: 16 g/mol) = 2(1) + 32 + 4(16) = 2 + 32 + 64 = 98 g/mol.
Moles of H₂SO₄
= 117 g ÷ 98 g/mol
= 1.194 moles of H₂SO₄.
Determine the volume of the final solution in liters:
The final volume is given as 1 liter.
Calculate the molarity:
Molarity (M)
= moles of solute ÷ liters of solution
= 1.194 moles ÷ 1 liter
= 1.194 M.
Therefore, the molarity of the diluted H₂SO₄ solution is 1.194 M.
What is an example of dissociation?
table sugar dissolving in water
table salt dissolving in water
hydrogen chloride dissolving in water
vegetable oil dissolving in water
Answer:
Table salt dissolving in water
Explanation:
NaCl(s) ⟶ Na⁺(aq) + Cl⁻(aq)
Sodium chloride is an ionic solid. When it goes into solution, the ions separate from the surface of the solid. The process is called dissociation.
A is wrong. In the solution process, the molecules simply separate from the surface of the crystal.
C is wrong. When HCl dissolves in water, it forms hydronium and chloride ions. The dissolution of covalent compounds in water to produce ions is called ionization.
D is wrong. Vegetable oil does not dissolve in water.
The Cretaceous-Tertiary extinction, the most famous of all the Big Five, has been attributed to what major event that triggered the fall of the dinosaurs?
Answer:
meteorite or comet impact
Explanation:
The Cretaceous-Tertiary extinction is not the most devastating one that happened, but because of the organisms that got extinct are very well known and famous, it too became the most famous extinction. The reason for the extinction was an impact of a meteorite or comet where Yucatan is located in the present. The impact was so strong that the energy released from it wiped out everything in the surrounding area. But that was not all, as this impact also caused large scale wildfires, activated most of the volcanoes on the planet, triggered enormous tsunami, and a very hot air mass circled the whole planet and fried everything that was not sheltered. The dust, ashes, and other particles released into the atmosphere blocked the sun for a long period of time. the end result was the extinction of lot of animals and plants, most noticeably the dinosaurs.
Particles vibrate in a rigid structure and
do not move relative to their neighbors.
That would be a description of a solid if that’s what your looking for. If not ask me in the comments:)
Particles vibrate in a rigid structure and do not move relative to their neighbours. It is the property of solid.
What is solid?A solid is a state of matter that retains its shape and density when not confined.
Properties of solids: Solids have definite volume and shape.
Hence, particles vibrate in a rigid structure and do not move relative to their neighbours.
Learn more about solid here:
https://brainly.com/question/9855675
#SPJ2
What is generally true about the particles in a gas?
Explanation:
Every gas molecules are held by weak Vander waal forces because of which each molecule of a gas is free is move from one place to another.
This causes more number of collisions between molecules of a gas and gaps will also increase between each molecule.
As a result, gases are able to diffuse or spread at a faster rate.
Hence, generally it is true about the particles in a gas that gases diffuse at a faster rate.
A substance that will change shape to fit its container but has a definite volume is in a________ phase of matter.
A substance that will change its shape to fit its container, but has a definite volume, is in a liquid state of matter.
➤ ReasonThere are four (confirmed) states of matter, Solids, Liquids, Gasses, and Plasma. Solids, have definite shape and volume. Metalloids is a solid that does not have a definite shape, but does have an 'original' shape, the shape the metalloid was originally in. Liquids although have no original shape, although is does have a definite volume, which is how much space it takes up. Liquids will change to fit the shape of its container, so no matter what you put a liquid in, it will fit its container in some way or form. Water for example, being a liquid at room temperature, when pouring water into a bottle, you see it take the shape of the container, as supposed to. Gasses and Plasmas are a bit more complicated, so you could look those up if you'd like. I hope this helps you.
✧ Oh god, no, I dropped my phases of matter. Please, someone help me.╚═⋄═◇═◈═❖═✧═☆═✧═❖═◈═◇═⋄═╝carbon dioxide is a common gas produced in burning describe a test for carbon dioxide gas
Answer:
burning gasoline
Explanation:
The test for carbon dioxide involves passing the gas through lime water. If the lime water turns milky, this indicates the presence of carbon dioxide. If more CO2 is passed through the milky lime water, it becomes clear again.
Explanation:You can test for the presence of carbon dioxide using a simple chemical reaction involving lime water (calcium hydroxide solution). This test is based on the fact that when carbon dioxide gas is passed into lime water, the lime water turns milky. This is because carbon dioxide reacts with the calcium hydroxide to produce calcium carbonate, which is insoluble in water and appears as a white precipitate, causing the milky appearance.
Step-by-step explanation of the test:
Prepare lime water by shaking about 1 gram of calcium hydroxide in approximately 500 ml of water. Filter the solution to obtain a clear lime water solution. Collect carbon dioxide gas in a test tube by a suitable method. Pass the collected carbon dioxide gas through the lime water. If the lime water turns milky, this confirms the presence of carbon dioxide.Note: If more carbon dioxide is passed through the milky lime water, it becomes clear again as the calcium carbonate further reacts with carbon dioxide and water to form calcium hydrogencarbonate, which is soluble in water.
Learn more about Carbon Dioxide Test here:https://brainly.com/question/33591670
#SPJ3
React 8 grams of copper (II) oxide (CuO) with 125 grams of hidrochloric acid (HCl) solution. Calculate the mass of the salt and water. The 125 grams is the mass of the HCl SOLUTION by means HCl have already dissolved in water. Thank you guys so much ;)))
Answer:
1) The mass of the produced salt (CuCl₂) = 13.45 g.
2) The mass of the produced water (H₂O) = 1.8 g.
Explanation:
The balanced chemical equation between CuO and HCl is:CuO + 2HCl → CuCl₂ + H₂O,
It is clear that 1 mol of CuO reacts with 2 mol of HCl to produce 1 mol of CuCl₂ and 1 mol of H₂O.
Firstly, we need to calculate the no. of moles of (8.0 g CuO) and (125.0 g HCl):no. of moles of CuO = mass/molar mass = (8.0 g)/(79.545 g/mol) = 0.1 mol.
no. of moles of HCl = mass/molar mass = (125.0 g)/(36.46 g/mol) = 3.43 mol.
From the balanced equation: CuO reacts with HCl with (1: 2) molar ratio.∴ 0.1 mol of CuO "limiting reactant" reacts with 0.2 mol of HCl "excess reactant".
To calculate the mass of the produced salt (CuCl₂):
1 mol of CuO produces → 1 mol of CuCl₂, from stichiometry.
∴ 0.1 mol of CuO produces → 0.1 mol of CuCl₂.
∴ The mass of the produced salt (CuCl₂) = (no. of moles)(molar mass) = (0.1 mol)(134.45 g/mol) = 13.45 g.
To calculate the mass of the produced salt (H₂O):
1 mol of CuO produces → 1 mol of H₂O, from stichiometry.
∴ 0.1 mol of CuO produces → 0.1 mol of H₂O.
∴ The mass of the produced water (H₂O) = (no. of moles)(molar mass) = (0.1 mol)(18.0 g/mol) = 1.8 g.
How is beryllium (Be) similar to calcium (Ca)?
A. Both are rare metals.
B. Both react readily with elements in Group 1.
C. Both are very reactive.
D. Both rarely combine with other elements.
Beryllium (Be) is similar to calcium (Ca) because both are somewhat reactive metals at standard temperature and pressure. Hence, option C is correct.
What is the alkaline earth metal group?The alkaline earth metals are six chemical elements in group 2 of the periodic table.
They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
The second column on the periodic table of the chemical elements is collectively called the alkaline earth metal group: beryllium, magnesium, calcium, strontium, barium, and radium.
Because the outer electron structure in all of these elements is similar, they all have somewhat similar chemical and physical properties.
Beryllium (Be) is similar to calcium (Ca) because both are somewhat reactive metals at standard temperature and pressure.
Hence, option C is correct.
Learn more about the alkaline earth metal here:
https://brainly.com/question/12835232
#SPJ2
What shape would a molecule with two bound groups and two lone pairs have?
Answer:
Bent.
Explanation:
A molecule with two bound groups and two lone pairs have a bent shape.
Hope this helps! Please mark brainliest!
Answer:
bent
Explanation:
The mole concept will most likely be used in
Answer:
determining how many ozone molecules are lost in the atmosphere
The mole concept can be used to determine the number of ozone molecules are lost in the atmosphere.
Who introduced mole concept?The mole concept was introduced by Avogadro. The mole is the SI unit of amount of substance. According to Avogadro, one mole of a substance contains 6.02 × 10^23 atoms, ions, molecules etc. The mole concept is important in many chemical calculations. The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.
To learn more about mole,refer here :
https://brainly.com/question/25263041
#SPJ2
which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , Bent , Trigonal pyramidal , linear
Answer:
The correct answer is D :Linear
Explanation:
Talking about molecular geometry and arrangement of atoms, liner geometry and trigonal bipyramidal arrangement of atoms would have 3 lone pairs and 2 no. of bond pairs.
For example, in ICl2 and XeF2, the central molecule has 3 lone pairs, and it shows sp3d hybridization.
In trigonal bipyramidal arrangement, orbitals have trigonal bipyramidal structure. It has three-atom molecules which have a linear shape and the orbitals on the equator contain three lone pairs each.
Answer:
linear
Explanation:
a p e x
The most common form of matter in the universe
Answer:
Plasma
Explanation:
stage in which a typical star has completely stopped fusion
Answer:
Red Giant
Explanation:
The stage in which a typical star has completely stopped fusion is called the Red Giant.
Please mark brainliest and have a great day!
Final answer:
A star stops fusion at the end of its lifecycle, becoming a white dwarf. Fusion of iron in the core requires energy, leading to the star's demise. Eventually, the white dwarf may explode as a type Ia supernova.
Explanation:
The stage in which a typical star has completely stopped nuclear fusion marks the end of its life cycle. After a star consumes all its hydrogen and goes through subsequent stages fusing heavier elements, it eventually reaches a point where further fusion is not energetically favorable. For example, the fusion of iron actually requires energy, signaling a catastrophic end for any star that reaches this stage.
A typical example of such an end state is when a star becomes a white dwarf. This occurs when all nuclear fusion has ceased within the star's interior, and it's stabilized by degeneracy pressure. The white dwarf represents the cooling cinder of a once vibrant star. Despite a brief resurgence of fusion in its outer layers that consume any remaining hydrogen, the star has effectively 'died' in terms of its stellar lifecycle. Over time, it may succumb to a violent end and be destroyed by a type Ia supernova, especially if it accumulates additional material from a companion star.
At the current rate, a graph of carbon dioxide produced by fossil fuels over time would __________.
slope upward
slope downward
be horizontal
be vertical
Answer:
Slope upward
Explanation:
The amount of carbon dioxide increases daily due to the increased use of petroleum fuels in diesel engines in the industries and by motor car users. The number of petroleum cars increases as their affordability increases. Use of LPG as domestic fuel has increased. These practices increase the amount of carbon dioxide in the atmosphere.
The rate of CO₂ production increases as these activities increases daily.
When balancing a chemical equation:
Answer: There must be the same number of atoms of each element on both sides of the equation.
Explanation: This is the only way the equations will be balanced. Adding the coefficients to see if they are equal will not guarantee that the equations are balanced becuase coefficients can be turned into subscripts.
how many moles in 5 g of mg
Answer:
Explanation:
5 g Mg 1 mole Mg
* ___________ = 0.208333 moles Mg
24 grams Mg
24 is from the periodic table
which are causes of mechanical weathering? check all that apply.
1 acid rain
2 plant growth
3 animal actions
4 carbon dioxide
5 pressure release
hii mate
YOUR ANSWER IS 5.PRESSURE RELEASE IS CAUSE OF MECHANICAL WEATHERING
Answer:
The answer is plant growth, animal actions, and pressure release.
Explanation:
I’m my lecture, it gave me a list of mechanical and weathering stuff so, you know it is right. :) hope this helped
Which diagram represents an object at static equilibrium?
A.
A
B.
B
C.
C
D.
D
Who knows the real answer to this??? Is it really D?
Answer:
the answer would be B.20n-->X<--20n
Explanation:
the amount of force is equal and balances out each other forming an equilibrium
Suppose you mix one mole of sulfuric acid (H2SO4) with 1 mole of sodium hydroxide(NaOH).
Why does the pH of the solution remain below 7?
(Please explain so I can get better understanding!)
Answer & Explanation:
The neutralization of H₂SO₄ with NaOH is occurred according to the balanced equation:H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O,
It is clear that every 1.0 mol of H₂SO₄ needs 2 mol of NaOH to be neutralized completely.
So, when you mix one mole of sulfuric acid with 1 mole of sodium hydroxide, there will be an excess of sulfuric acid.
Thus, the pH of the solution remain below 7.
Which statement about Niels Bohr's atomic model is true?
O Higher orbits have lower energies.
Each orbit has a specific energy level.
Electrons can exist in any energy level.
O Orbits close to the nucleus have no energy.
Answer:
See explanation ...
Explanation:
Actually, two of the listed statements are correct with respect to the Bohr Model of the atom. Orbitals are defined by specific energy levels relative to the nucleus of the atom that it is associated and electrons can exist in any energy level.
That is, the bases of the Bohr (Concentric Ring) Model of the atom is found in the study of bright line emission spectra of atoms (hydrogen to be specific) in that the bright lines of the spectrum generated are caused by electrons transitioning from higher energy level orbitals to lower energy level orbitals releasing 'discrete' amounts of energy in the form of electromagnetic radiation. The potential energy content of an electron while in a specified energy level (As described by Neils Bohr et.al.) is given by the expression Eₙ = -A/n²; A = 2.18 x 10⁻¹⁸ joules. When applied to electron transitions, say from the n = 3 level to the n = 2 level, the energy emitted (ΔE₃→₂ = -2.18 x 10⁻¹⁸J(1/2² - 1/3²) = -2.03 x 10⁻¹⁹j. This is the energy carried by a photon having a wavelength of 656.1-nm and can be seen as a red-light band in the bright line spectrum of the Hydrogen atom.
Answer:
Ignore the other answer The answer is B
Explanation:
A lab technician needs to create 570.0 milliliters of a 2.00 M solution of magnesium chloride (MgCl2). To make this solution, how many grams of magnesium chloride does the technician need?
Refer to the periodic table for help. Express your answer to three significant figures.
Answer:
108.3g
Explanation:
Given parameters:
Volume of solution = 570mm = 0.57L (1000mm = 1L)
Molarity of solution = 2M
Unknown
Mass of MgCl₂
Solution
We first find the number of moles in the given concentration of magnessium chloride using the expression below:
Number of moles of MgCl₂= Molarity x volume = 2 x 0.57 = 1.14moles
Using this known moles, we can the unknown mass of MgCl₂ the technician would require:
Mass of MgCl₂ required = number of moles of MgCl₂ x molar mass
Molar mass of MgCl₂:
Atomic mass of Cl = 35.5g
Atomic mass of Mg = 24g
MgCl₂ = 24 + (35.5x2) = 95gmol⁻¹
Mass of MgCl₂ required = 1.14mole x 95gmole⁻¹ = 108.3g
The required mass is 109 grams.
#platofam
If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?
Answer:
=21 neutrons
Explanation:
The atomic mass of an atom is the total sum of the contents of the nucleus (protons and neutrons).
Thus atomic mass = no. of neutrons + no. of protons
Number of protons= The atomic mass-number of protons
= 34 - 13= 21
Question 3(Multiple Choice Worth 4 points)
(04.04 LC)
What does it mean when an element is reduced?
It empties a valance shell, reducing its atomic radius.
It gains electrons, reducing its overall charge.
It increases electronegativity, reducing its ability to bond.
It loses electrons, reducing its electron number.
Answer:
It gains electrons, reducing its overall charge
Explanation:
When an ion of element gains electrons its overall charge decreases, thus the it reduced.
Consider the half equation involving Iron (III) ions.
Fe³⁺+ e⁻ → Fe²⁺
In this equation, the iron III ion has gained an electron changing then to iron II ions. The charge has thus decreased from 3+ to 2+.
This is a reduction reaction.
Answer:
It gains electrons, reducing its overall charge
Explanation:
What is the relative mass of an electron?
a) 1/1840 the mass of a neutron + proton
b) 1/1840 the mass of an alpha particle
c) 1/1840 the mass of a C-12 atom
d) 1/1840 the mass of a hydrogen atom
Answer:
1/1840 the mass of a C-12 atom
Choice C is correct
Explanation:
The relative mass of an electron is 1/1840 the mass of a C-12 atom . Atomic mass units are expressed relatively to the atomic mass unit of an unbound neutral carbon-12 atom.
d) 1/1840 of hydrogen atom mass is the relative electron mass.
Explanation:The hydrogen gas is the lightest element and its atomic mass is [tex]\bold{1.67 \times 10^{-27} \ kg}[/tex], same as the mass of proton because it has no neutron and contains one proton and one electron in its atom. But it loses an electron to gain stable electronic configuration leaving only a proton in its atomic structure.
We know, Mass of an electron = [tex]9.11 \times 10^{-31} \ kg[/tex]
[tex]\text{Relative mass of electron} = \frac{\text{Mass of proton}}{\text{Mass of electron}}[/tex]
Relative mass of electron = [tex]\frac{1}{1840}[/tex] the mass of proton
Relative mass of electron = [tex]\frac{1}{1840}[/tex] the mass of hydrogen atom.
The atom fluorine generally will become _____ stable through the formation of an ionic chemical compound by accepting _______ electron(s) from another atom. This process will fill its outer energy level of electrons.
Answer:
more, negative
Explanation:
It will become more stable by combining the negative electrons.
The atom fluorine generally will become highly stable through the formation of an ionic chemical compound by accepting one electron from another atom. This process will fill its outer energy level of electrons.
Atomic number of fluorine is 9. The electronic configuration of fluorine is 2,7. Fluorine has 7 electrons in the valence shell, so it requires one electron to attain the noble gas configuration, which is highly stable.
Thus, we can conclude that through the formation of ionic chemical bonds fluorine become highly stable, by accepting one electron from another atom.
Learn more about fluorine here:
https://brainly.in/question/825790
Which of the following best describes why ice has a lower density than liquid water?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state.
(Choice B)
B
Because water changes from its polar form as a liquid to its nonpolar form as a solid.
(Choice C)
C
The water molecules have less atomic motion than ice.
(Choice D)
D
There is more space between individual atoms at lower temperatures, which means colder water has a lower density.
Ice has a lower density than liquid water because hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state.
Explanation:Hydrogen bonding is a strong intermolecular force that occurs when hydrogen atoms are covalently bonded to highly electronegative atoms (e.g., nitrogen, oxygen, or fluorine). These hydrogen bonds result in attractive forces between neighboring molecules, contributing to unique properties like high boiling points in substances such as water and the stability of biomolecules like DNA and proteins.
Hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state. This is because ice has a unique crystal structure known as a hexagonal lattice, in which water molecules form open spaces or voids between them. The hydrogen bonds in ice are more stable and rigid, allowing the water molecules to arrange themselves in a way that maximizes the empty space between them.
Learn more about Density of Ice vs. Liquid Water here:https://brainly.com/question/33443622
#SPJ6
Ice has a lower density than liquid water because when water freezes, the water molecules form a crystal lattice structure due to hydrogen bonding. This structure creates more space between the molecules and thus a lower density.
Explanation:The best description for why ice has a lower density than liquid water is Choice A: Hydrogen bonding causes water to crystallize with more empty space between molecules than in the liquid state.
When water freezes into ice, the water molecules form a crystal lattice due to hydrogen bonding. This lattice structure has more space between the water molecules compared to when water is in its liquid state, resulting in a lower density of ice than liquid water.
Learn more about the Density of Ice here:https://brainly.com/question/11696500
#SPJ6
Do you guys know the answer
Answer:
NH₄NO₃.
Explanation:
NH₄NO₃ is a salt that has a pH < 7.It is formed from the reaction of strong acid (HNO₃) and weak base (NH₄OH).HNO₃ + NH₄OH → NH₄NO₃ + H₂O.
It is clear that it is an acidic salt.
So, its pH is < 7.
The equation below shows a chemical reaction.
A + B + heat —> C + D
According to the law of conservation of energy, which statement is true?
A. The reactants absorb heat because they have less energy than the products.
B. The products release heat because they have more energy than the reactants.
C. The reactants generate heat because they have more energy than the products.
D. The products require heat to form because they have less energy than the reactants.
Answer:
A. The reactants absorb heat because they have less energy than the products.
Explanation:
According to the law of conservation of energy, energy can neither be created nor destroyed.
The given equation of the chemical reaction indicates that the reaction is endothermic as heat is absorbed by the reactants. In an exothermic reaction heat is released by the products.
In an endothermic reaction initially the heat of the reactants in less than the products, thus according to the law of conservation of energy, the reactants absorb heat such that there is equal amount of heat on both the reactant and product side.
what is the solution to the problem expressed to the correct number of significant firgures? 15.11+(142×16.5)
A 2,358
B 2,358.1
C 2,360
D 2,400
Answer:
B. 2358.1
Explanation:
142×16.5=2343
ans+15.11=2358.2
Answer: A. 2,358
Look at the image below.
This is a significant figures calculator.