Answer: During a chemical reaction, matter cannot be created nor destroyed, matter can change form through physical and chemical changes, but through any of these changes, matter is conserved; even though the matter may change from one form to another, the same number of atoms exists before and after the change takes place.
Explanation: <3
2n2 h4(g) + 2no2(g) ⇌ 3n2(g) + 4h2o (g)
Answer:(n2)^3 (h20)^4
(n2)^3 (h20)^2
Explanation:
Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of 20.0 m/s.
Answer: 200000 J
Explanation:
Formula for kinetic energy: Ek=1/2 *mv^2
m=1000 kg. v=20.0m/s
Ek=1/2 *1000*20^2
Ek=500*400
Ek=200000 J
J=joules
The energy that is associated with the temperature of an object is called?
Answer:
The thermal energy of an object is the energy contained in the motion and vibration of its molecules. Thermal energy is measured through temperature.
Which answer correctly identifies the five levels of cell organization from simple to most complex A-bone cell, bone tissue, femur, skeleton, dog B-dog, skeleton, femur, bone tissue, bone cell C-bone tissue, dog, bone cell, femur, skeleton
Answer:
A-bone cell, bone cell C-bone tissue, bone cell bone tissue, femur, skeleton, dog B-dog.
Explanation:
It is ordered from the smallest unit (tissue microstructure) to a tissue or organ that are considered macrotisular structures.
What characteristic do atoms in the same group of elements share?
1 - they have the same number
2 - they have similar physical property
3 - they have the same atomic mass
4 - the same number of electrons orbitals
Answer:
2 option
Explanation:
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What is embedded in the phospholipid bilayer and forms the channels and pumps to help molecules pass through the cell membrane
The molecule H2O can be correctly described as a?
1) compound.
2) compound and a molecule.
3) molecule.
ASAP pleaseee and Thankyou
options:
genotype
phenotype
Answer:
phenotype then genotype
Explanation:
phenotype is observable traits, genotype is heritable genes that can be passed down
Heat depends on A. Atmospheric pressure B. Particle speed only C. Number of particles D. Both speed and amount
Brainlist
Which change of state is the reverse of condensation?
O A. Freezing
O B. Vaporization
O C. Melting
O D. Deposition
Answer:
vaporization is the reserve of condensation
Answer:
B. Vaporization
Explanation:
The opposite of becoming a liquid from a gas is a gas becoming a liquid.
why would a peretual machine never work?
Answer:
Because magnets wear out. Magnetic perpetual machines can never work because magnets eventually wear out. This isn't the reason they don't work. Magnets can lose their magnetism in several ways; Heat them to very high temperatures. Hit them repeatedly with a hammer.
Answer:
It'd never work as the first law of physics is that the law of conservation of energy. It states that energy is often preserved. To keep a machine moving, the energy applied ought to stay with the machine with none losses. As a result of this reality alone, it's not possible to make perpetual motion machines.
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describe the general trend in electronegativity as metals in group 2 on the periodic table are concidered in order of increasing atomic number
Answer:
Electronegativity decrease in group from top to bottom
Explanation:
How does the activity series of metals reflect the stability of metals?
A. The metals lowest on the list are the least stable.
B. The metals highest on the list are the most stable.
C. The metals lowest on the list are the most reactive.
D. The metals highest on the list are the least stable.
The activity series of metals reflect the stability of metals are "the metals highest on the list are the least stable."
What is activity series?The organization of metals in a declining sequence of respective reactivities is referred to as the "activity series," also described as the "reactivity series" of metals.
What is metals?Materials having the qualities of being bright, hard, fusible, malleable, ductile, etc. were known as metals.
The activity series of metals reflect the stability of metals are "the metals highest on the list are the least stable."
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Do you BELIVE this is how you make Slime?
Slime flows like a liquid, but unlike familiar liquids (e.g., oil, water), its ability to flow, or viscosity, is not constant. So it's a fluid, but not a regular liquid. Scientists call a material that changes viscosity a non-Newtonian fluid. The technical explanation is that slime is a fluid that changes its ability to resist deformation according to shear or tensile stress.
What this means is, when you pour slime or let it ooze through your fingers, it has a low viscosity and flows like a thick liquid. When you squeeze a non-Newtonian slime, like oobleck, or pound it with your fist, it feels hard, like a wet solid. This is because applying stress squeezes the particles in the slime together, making it hard for them to slide against each other.
Most types of slime are also examples of polymers. Polymers are molecules made by linking together chains of subunits.
The specifics of how a type of slime works depends on its chemical composition, but the basic explanation is that chemicals are mixed to form polymers. The polymers act as a net, with molecules sliding against each other.
Two solutions are combined to make classic slime. One is diluted school glue, or polyvinyl alcohol in water. The other solution is borax (Na2B4O7.10H2O) in water.
Borax dissolves in water into sodium ions, Na+, and tetraborate ions.
The tetraborate ions react with water to produce the OH- ion and boric acid:
B4O72-(aq) + 7 H2O 4 H3BO3(aq) + 2 OH-(aq)
Boric acid reacts with water to form borate ions:
H3BO3(aq) + 2 H2O B(OH)4-(aq) + H3O+(aq)
Hydrogen bonds form between the borate ion and the OH groups of the polyvinyl alcohol molecules from the glue, linking them together to form a new polymer: slime.
The speed of light in a vacuum is 2.998×10^8 m/s .
What is its speed in miles per minute (mi/min)?
Answer:299,800,000
Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.
Which ranks the solutions from the strongest to weakest acid?
W X Y Z
Y W X Z
W X Z Y
Y Z X W
Answer:
the answer is the last option yzxw
Explanation:
ph is stronger the lower
Answer:
D: Y → Z → X → W
Explanation:
on edge2021! hope this helps!!~ ー( ´ ▽ ` )ﾉ
IF the strong nuclear force affects all particles that are close to each other, What will happen if we add two neutrons to our nucleus with two protons?
A) It will decrease the electromagnetic force in the nucleus
B) It will decrease the strong nuclear force in the nucleus
C) It will increase the strong nuclear force in the nucleus
D) It will increase the electromagnetic force in the nucleus
Answer: it will increase the strong nuclear force in the nucleus
Explanation: Labster
Answer : It will increase the strong nuclear force in the nucleus ( C )
Given that the strong nuclear force affects the particles that are close to each other addition of two neutrons and two protons, will cause an increase in the strong nuclear force found in the nucleus . this is because a Nucleus with two ( 2 ) protons exhibits attractive nuclear force and a repulsive coulomb force. and since the nuclear force does not depend on the charge, the addition of two neutrons the attractive nuclear force will increase
Hence we can conclude that addition of two neutrons to our nucleus with two protons will increase the strong nuclear force in the nucleus.
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true or false. sound waves are reflected off of soft surfaces
Answer:
false
Explanation:
soft surfaces absorb sound. :)
Answer:
FALSE
FALSE FALSE FALSE FALSE FALSE
Explanation:
What is the frequency of a 7.43e-5 m wave?
2.23e3 Hz
4.04e12 Hz
2.48e-13 Hz
None of the above
Answer:
None of the above!
Explanation:
A museum wants to store their valuable documents in cases that contain a gas that will protect the documents. The museum director should choose
Choose... = chlorine gas, oxygen gas, a noble gas, a halogen.
She should not choose one of the other gases because they are too
Choose... = expensive, reactive, smelly, unreactive.
Answer:
A noble gas, reactive
Explanation:
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Which of the following most likely requires intermolecular forces?
Answer: The intermolecular forces increase with increasing polarization of bonds. Boiling point increases with molecular weight, and with surface area. The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds. Intermolecular forces are much weaker than the intramolecular forces of attraction but are important because they determine the physical properties of molecules like their boiling point, melting point, density, and enthalpies of fusion and vaporization.In order from strongest to weakest, the intermolecular forces given in the answer choices are: ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces. Ionic bonding is stronger than any of the given intermolecular forces, but is itself NOT an intermolecular force.
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Answer:
A
Explanation:
edge 2020
(5 Points) If you put a piece of zinc into a solution of copper (I) sulfate and allow the single replacement reaction to go to completion, how will you know which of the reactants is the limiting reactant? Write the balanced equation, including the states of matter of the reactants and products, to help support your answer.
CuSO4(___) + Zn (__) → Cu(__) + ZnSO4 (___)
Is it balanced? ____yes____ If not, fix it.
Answer:
Direct Redox Reactions. When a strip of zinc metal is placed into a blue solution of copper(II) sulfate ( Figure below ), a reaction immediately begins as the zinc strip begins to darken. If left in the solution for a longer period of time, the zinc will gradually decay due to oxidation to zinc ions
Explanation:
We need to balance the equation then can we say
[tex]\\ \rm\Rrightarrow CuSO_4+Zn\longrightarrow Cu+ZnSO_4[/tex]
It's already balancedZn does the reaction so zinc is the limiting reagent ,
Until zinc is present the reaction continues
How many atoms are in 1.5 moles of calcium
Answer:
9.0×10^23
Explanation:
1.5mols x [tex]\frac{6.022*10^{23}atoms}{1mol}[/tex]=9.0×10^23
Put the steps below in the order they are performed in the lab experiment by numbering them 1-7. Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases. Measure the final masses of the crucible, cover, and anhydrous salt. Compute differences in masses to find the reactants and products. Measure initial masses of the crucible and cover, with and without the hydrate. Use the numbers of moles to compute the mole ratio. Use stoichiometry to convert these masses to moles. Use the mole ratio to write the hydrate’s formula.
Answer:
1) Measure initial masses of the crucible and cover with and without the hydrate.
2) Use a Bunsen burner to heat and dry the hydrate, repeating until the mass no longer decreases.
3) Measure the final masses of the crucible, cover, and anhydrous salt.
4) Compute differences in masses to find the reactants and products.
5) Use stoichiometry to convert these masses to moles.
6) Use the numbers of moles to compute the mole ratio.
7) Use the mole ratio to write the hydrate’s formula.
Explanation:
A hydrate is any substance that contains water of crystallization. The water of crystallization constitutes part of the mass of the substance. When heated to constant mass, the substance looses its water of crystallization and becomes anhydrous.
The mass of the anhydrous substance is now obtained by weighing again and subtracted from that of the hydrated substance. The masses are converted to moles using stoichiometry and the moles are then used to obtain the formula of the hydrate.
Answer: answers in order from top to bottom
2
3
4
1
6
5
7
Explanation: right on edg
I just need help plz!
_______ is the process of using a specific material to speed up a chemical reaction, leaving the material unchanged at the end of the reaction.
Answer:
Catalyse
Note that I'M NOT A SCIENCE TEACHER! I MIGHT BE INCORRECT, DOUBLE CHECK YOUR ANSWER!
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Answer:
Catalyse
Explanation:
Catalysis is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst.
Top answer is most likely true
A cylinder of compressed gas has a volume of 350 ml and a pressure of 931 torr. What volume in Liters would the gas occupy if allowed to escape into a balloon at a pressure of 113 kPa if temperature and # of molecules remain constant?
Answer:
[tex]0.384\ \text{L}[/tex]
Explanation:
[tex]P_1[/tex] = Initial pressure = 931 torr = [tex]931\times \dfrac{101.325}{760}=124.12\ \text{kPa}[/tex]
[tex]P_2[/tex] = Final pressure = 113 kPa
[tex]V_1[/tex] = Initial volume = 350 mL
[tex]V_2[/tex] = Final volume
From the Boyle's law we have
[tex]P_1V_1=P_2V_2\\\Rightarrow V_2=\dfrac{P_1V_1}{P_2}\\\Rightarrow V_2=\dfrac{124.12\times 350}{113}\\\Rightarrow V_2=384.44\ \text{mL}=0.384\ \text{L}[/tex]
The volume the gas would occupy is [tex]0.384\ \text{L}[/tex].
calculate the number of hydrogen atoms in a 90.0g sample of camphor c10h16o. be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
The number of hydrogen atoms in a 90.0g sample of camphor C₁₀H₁₆O is 5.68 X 10²⁴.
The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grams per mole of a substance, to put it another way.
Given,
Mass of sample of camphor (C₁₀H₁₆O), m = 90.0g
To find: No. of hydrogen atom in given sample.
Molecular mass of camphor is:
M = 152 g/mol
Moles of camphor,
n = m/M
n = 90/152 = 0.59
1 mole of camphor contains 16 moles of Hydrogen
so, 0.59 moles of camphor contains 9.44 moles of hydrogen
1 mole of any substance contain 6.022 X 10²³ no. of atoms/molecule
So, no. of atoms in 9.44 moles of hydrogen is
N = 6.022 X 10²³ X 9.44
N = 56.84 X 10²³
N = 5.68 X 10²⁴
Hence, The number of hydrogen atoms in a 90.0g sample of camphor C₁₀H₁₆O is 5.68 X 10²⁴.
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Calculate the concentration of hydrogen ion of a sample of vinegar with pH 6.82
The concentration of hydrogen ion of a sample of vinegar : 1.514 x 10⁻⁷
Further explanationpH is the degree of acidity of a solution that depends on the concentration of H⁺ ions. The greater the value the more acidic the solution and the smaller the pH.
So that the two quantities between pH and [H⁺] are inversely proportional because they are associated with negative values.
A solution whose value is different by n has a difference in the concentration of H⁺ ion of 10ⁿ.
pH = - log [H⁺]
pH of a sample vinegar = 6.82
The concentration of hydrogen ion :
[tex]\tt 6.82=-log[H^+]\\\\(H^+]=10^{-6.82}=1.514\times 10^{-7}[/tex]
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Which molecule is relatively inert and
contains a triple bond?
(1) N2
(2)O2
(3) Cl2
(4). H2
Answer:
N2
Explanation:
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Answer:N2
Explanation:
Name the compound O2Cl6
Answer:
dioxide hexachloride