Answer:
b i think
Explanation:
Which statement BEST describes electromagnetic and mechanical waves?
A.
Electromagnetic waves and mechanical waves both do not require a medium.
B.
Mechanical waves require a medium and electromagnetic waves do not.
C.
Electromagnetic waves require a medium and mechanical waves do not.
D.
Mechanical waves and electromagnetic waves both require a medium.
Answer:
C I believe
Explanation:
Josh used several different liquid chemicals for an experiment in his chemistry class. After completing the experiment, the chemicals were no longer usable. Josh carefully poured each chemical into a bottle marked "Waste" and placed the lid back on the bottle. Did Josh use the correct procedure?
A.
No; different types of chemical waste should not be mixed together.
B.
No; the chemicals should have been poured down the sink.
C.
No; the chemicals should have been poured into the trash can.
D.
Yes; the chemicals were stored in the proper place.
Which organic prefix is matched with the number of carbon atoms that it represents?
Answer:heat-,7
Explanation:According to table P, heat- is an organic prefix used to represent 7 carbon atoms
Hept-7 is an organic prefix matched with the number of carbon atoms that it represents.
The correct option is A.
What is an organic prefix?The prefix is the words that are attached prior to the words to modify their meaning.
In organic chemistry, prefixes are added to show the number of carbon present in any compound.
Hepta is used for 7, the same Octa is for eight, Penta is for five, Hexa is for six, and so on.
Thus, the correct option is A, Hept-7.
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define adhesion and give an example?
Similar to Cohesion, adhesion is the attraction between molecules of different substances . Water uses adhesion when it's attraction to another substance is greater than the water's attraction to itself. if you have ever dropped a cup of water on a hardwood floor,you know that it spreads out instead of foaming beads.
Which elements in the image are likely
to lose electrons in an ionic bond
A. neon and chlorine
B. calcium and
potassium. C.neon and
potassium
D. There is not enough information to tell
What is a mol? Is it big or small?
Answer:
mol is a measurement of large amounts so big
1. How many particles are present in 800 grams of copper (II) sulfide, CuS? The molar mass of CuS is 95.611 g/mol.
2. How many particles are present in 50 grams of aluminum oxide, Al2O3? The molar mass of Al2O3 is 101.961 g/mol.
3. How many particles are present in 150 grams of calcium oxide, CaO? The molar mass of CaO is 56.077 g/mol.
4. How many particles are present in 39 grams of sulfuric acid, H2SO4?
5. How many particles are present in 345 grams of hexane, C6H14?
Soil that contains soil, sand, shells, decaying matter, is an example of which type of mixture?
Heterogeneous
Homogeneous
Which industry would most likely be affected if coal recourses were depleted.
1.Power production
2.Transportation
3.construction
True or false: Breaking down water into the elements hydrogen and oxygen is an example of a chemical change.
Answer:
True.
Explanation:
When water is decomposed into hydrogen and oxygen, chemical bonds are broken, chemical energy is released, and two new substances are formed from one.
True or False Friction can be reduced by lubricating or changing the shape of objects
Answer:
True
Explanation:
If you cover cup in soap it will be a lot more slippery than it was before, if you reshaped a car wheel to have less treads then it would have much less friction.
When energy changes from one form to another, some energy is always changed to
ОА.
sound.
ОВ.
heat.
Ос.
light.
OD
electricity
Answer:
OB heat
Explanation:
Hope this helps
What's the correct name for Pt3N5
Answer:Phosphate
Explanation:It is called phosphate because of this higher state (otherwise it would be called phosphite and be PO3+3 ).
How many moles of gas are in a 30 liter compressed air tank if the
temperature of the tank is 300K and the pressure is 200 atmospheres? *
Answer:
B
Explanation:
If oil and water have opposite intermolecular forces, why do they seem to mix at the border between them?
Answer:
The Chemistry Explanation
Oil and water don't mix because water molecules are not attracted to oil molecules. When the Alka-Selzer tablet is dropped in the oil and water, it sinks to the bottom because it is more dense than oil and more dense than the water.
Intermolecular forces such as dipole-dipole forces, London dispersion forces exist between molecules and these depend on strength of electronegativity of molecule. Therefore, oil and water mix at the border.
What is intermolecular forces of attraction?Intermolecular forces of attraction is force of attraction that make two molecule come closer. Intermolecular forces of attraction is directly proportional to the electronegativity of the molecule.
Size of electronegative molecule is small so, if any other molecule or molecule come into contact with this molecule then this molecule attract the electron of other molecule very efficiently and therefore the force between the molecule increases.
Oil has weaker intermolecular forces than water. This makes the intermolecular forces in oil easier to break, and keeps the molecules stuck together in a liquid state.
Therefore, oil and water mix at the border.
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Carol views a specimen under the microscope and notices that it has no nucleus. What
must she be looking at?
A. Animal cell
B. Plant cell
C. Bacteria
D. Protist
Answer:
Bacteria
Explanation:
How many moles of a gas would occupy 22.4 Liters at 273 K and 1 atm?
Answer:
1 mole of a gas would occupy 22.4 Liters at 273 K and 1 atm
Explanation:
An ideal gas is a set of atoms or molecules that move freely without interactions. The pressure exerted by the gas is due to the collisions of the molecules with the walls of the container. The ideal gas behavior is at low pressures, that is, at the limit of zero density. At high pressures the molecules interact and intermolecular forces cause the gas to deviate from ideality.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= 1 atmV= 22.4 Ln= ?R= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T=273 KReemplacing:
1 atm* 22.4 L= n* 0.082 [tex]\frac{atm*L}{mol*K}[/tex] *273 K
Solving:
[tex]n=\frac{1 atm* 22.4 L}{0.082 \frac{atm*L}{mol*K} *273 K}[/tex]
n= 1 mol
Another way to get the same result is by taking the STP conditions into account.
The STP conditions refer to the standard temperature and pressure. Pressure values at 1 atmosphere and temperature at 0 ° C (or 273 K) are used and are reference values for gases. And in these conditions 1 mole of any gas occupies an approximate volume of 22.4 liters.
1 mole of a gas would occupy 22.4 Liters at 273 K and 1 atm
what is the shape of graphite
Answer:
The molecular formula lists the symbol of each element within the compound followed by a number (usually in subscript). The letter and number indicate how many of each type of element are in the compound. If there is only one atom of a particular element, then no number is written after the element.
Why do atoms of different elements vary in size?
Answer:
As you go down the periodic table, usually atoms get bigger because n gets bigger (there are electrons in higher shells). Effective nuclear charge does get bigger too going down the periodic table, but this effect is smaller than the change in shell.
Explanation:
The the _____ temperature _____ the the air molecules move. (Choose 2) higher, faster lower, faster lower, slower higher, slower
Answer:
The higher the temperature the faster the air molecules move. / The lower the temperature the slower the air molecules move.
Explanation:
Both answers work. Higher temp = more energy = moving faster, and the opposite applies. Lower temp = less energy = moving slower.
Why do atoms make up the basic building blocks of matter?
Atoms are the basic building blocks of ordinary matter. Atoms can join together to form molecules, which in turn form most of the objects around you. The protons and neutrons cluster together in the central part of the atom, called the nucleus, and the electrons 'orbit' the nucleus.
Hope this helped!
Balance the equations of Al(OH)3+HNO3----Al(NO3)3+H2O
Answer:HNO3 + Al(OH)3 → Al(NO3)3 + H2O
Word equation: Nitic acid + Aluminum hydroxide → Aluminum nitrate + water
Type of Chemical Reaction: For this reaction we have a neutralization reaction.
Balancing Strategies: In this neutralization reaction we have HNO3 reacting with Al(OH)3.
Be sure to carefully count the O and H atoms on both sides of the equation, otherwise this will be a difficult equation to balance.
Hint 1
Start by balancing the N atoms.
Hint 2
Next balance the H atoms.
This is the balence form of it
3HNO3+ Al(OH)3 = Al(NO3)3 +3H2O
Explanation:
Once more i need help
It's the same paragragh/field trip except a different question
Field Trip to the Blacksmith Shop
Students at a middle school went to a local historical site on a field trip. While visiting the site they watched a demonstration in a blacksmith shop. Blacksmithing is the simplest form of forging and it is one of the methods by which metal was first worked. The metal to be forged is first heated to red heat in the fire of a forge, and then is beaten into shape on a metal anvil with sledges or hammers. Steel is used in the forging process. The material we call steel is a mixture of different metals. The element iron (Fe) makes up a large percentage of all steels, generally composing more than 75 percent of the mix by percent of total mass. Steel is made from iron, and in the process, some element percentages are reduced in the alloy composition (such as carbon and silicon), and other elements (such as chromium, nickel, and tungsten) are added, depending on the type of steel needed.
As the iron is worked on the anvil, the color changes from red to gray. Which of the following is happening to the molecules as the iron cools down?
The atoms move more slowly and closer together.
The atoms move more quickly and closer together.
The motion of the atoms stay mostly the same.
The motion of the atoms become very orderly.
Answer:
The atoms move more quickly and closer together.
is h2o a pure element or a compound
Identify the following as an element or compound: sucrose/sugar (C12 H22 O11)
Answer:
Explanation:
its a compound
Given the balanced equation:
KNO3 (s) + 34.89 kJ H20, K+ (aq) + NO3 - (aq)
Which statement best describes this process?
A) It is endothermic and entropy increases.
B) It is endothermic and entropy decreases.
C) It is exothermic and entropy increases.
D) It is exothermic and entropy decreases.
[tex]KNO3 (s)[/tex] → [tex]K+ (aq) + NO_3^- (aq)[/tex] is an endothermic reaction and entropy decreasing.
What is an endothermic reaction?An endothermic reaction is any chemical reaction that absorbs heat from its environment.
This reaction [tex]KNO3 (s)[/tex] → [tex]K+ (aq) + NO_3^- (aq)[/tex] is absorbing heat from the surrounding. Endothermic reactions are characterized by positive heat flow (into the reaction) and an increase in enthalpy (+ΔH).
It will lower the entropy of the surroundings by absorbing energy. In doing so the surroundings will lose energy, and randomness is decreased. These reactions are not spontaneous.
Hence, option B is correct.
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Please help me with this!!?
Answer:
The last answer is right they get half of the mothers genes and half of the fathers genes.
Which of the following correctly shows the bond polarity?
please help me asap!
c. H-I>Se-N>Cl-F
that is the answer i think...
How do ionic bonds differ from covalent bonds? I NEED HELP QUICK PLSSS!!!!!
Answer:
.
Explanation:
Answer:
Ionic bonds are usually between a metal and a nonmetal and involve the transfer of electrons. Covalent bonds are typically between two nonmetals and involve the sharing of electrons.
Explanation:
When elements bond together ionically, they transfer their valence electrons to another element to satisfy the octet rule and create full shells of 8 electrons. Metals usually have low electronegativity and ionization energy and can more easily give up an electron to a nonmetal with higher electronegativity and ionization energy.
When two nonmetals bond, their electronegativities are close enough in magnitude that neither element can "claim" the valence electrons, so the electrons orbit back and forth between the elements in the bond.
is gold an example of a metal or nonmetal
Answer:
Gold is a metal lol
Explanation:
Chemically, gold is a transition metal and a group 11 element