what does the atomic mass number of each atom represent.
The atomic mass number tells us the number of neutrons and protons in the nucleus of an atom.
Which atmospheric layer is closest to Earth's surface?
A exosphere
B. mesosphere
c. stratosphere
D. troposphere
Answer:
The answer is the troposphere
Explanation:
It is the closest to earth
The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence
to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that
occurred when water and X were mixed?
The question is incomplete, the complete question is;
The table above summarizes data given to a student to evaluate the type of change that took place when substance X was mixed with water. The student claimed that the data did not provide enough evidence to determine whether a chemical or physical change took place and that additional tests were needed. Which of the following identifies the best way to gather evidence to support the type of change that occurred when water and Xwere mixed?
A. Measuring the melting point of the mixture of water and X
B. Adding another substance to the mixture of water and X to see whether a solid forms
C Measuring and comparing the masses of the water, X, and the mixture of water and X
D Measuring the electrical conductivities of X and the mixture of water and X
Answer:
D Measuring the electrical conductivities of X and the mixture of water and X
Explanation:
Unfortunately, I am unable to reproduce the table here. However, from the table, the temperature of the of the mixture of the solid X and water was 101.6°C. This is above the boiling point of water and way below the temperature of the solid X.
This goes a long way to suggest that there was some kind of interaction between the water and X which accounted for the observed temperature of the system of X in water.
The only way we can be able to confirm if X actually dissolved in water is to measure the conductivity of the water. dissolved solids increase the conductivity of water.
The statement which identifies the best way to gather evidence to support the type of change that occurred when water and X were mixed is:
D Measuring the electrical conductivities of X and the mixture of water and XAccording to the given question, we are asked to show the statement which identifies the best way to gather evidence to support the type of change that occurred when water and X were mixed. \
As a result of this, we can see that from the complete question, there is a need to note the temperature of the solution which is 101.6°C and then to measure the conductivity of the water to know for sure the type of change that occured.
Therefore, the correct answer is option D
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What is the single distinctive property of metals
Answer:
All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
Explanation:
Answer:
All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide.
Explanation:
2. Al(OH),(s) + 3 HCl(aq) à 3 H2O(l) + AlCl3(aq). This reaction shows how aluminum hydroxide
in antacid tablets neutralizes hydrochloric acid in the stomach. A tablet containing 0.25 g of
aluminum hydroxide is ingested by a patient with 0.88 g of hydrochloric acid in their stomach. Is
this tablet sufficient to neutralize the acid in the patient's stomach? Explain using stoichiometric
calculations. [4 marks]
I
This tablet insufficient to neutralize the acid in the patient's stomach
Further explanationReaction
Al(OH)₃(s) + 3HCl(aq) ⇒ 3 H₂O(l) + AlCl₃(aq)
0.25 g of Aluminum hydroxide-Al(OH)₃ , mol (MW=78 g/mol) :
[tex]\tt \dfrac{0.25}{78}=0.00321[/tex]
mol HCl : mol Al(OH)₃ = 3 : 1
[tex]\tt mol~HCl=3\times 0.00321=0.00963[/tex]
mass HCl (MW=36,46 g/mol) :
[tex]\tt 0.00963\times 36.46=0.351[/tex]
0.351 < 0.88⇒this tablet insufficient to neutralize the acid
T/F: If the number of protons changes from 7 to 9, the element changes
The specific heat of a certain type of metal is 0.128 J/(g⋅∘C). What was the intial temperature if 0.305 kJ of heat is added to 94.8 g of metal to reach a temperature of 85.0 ∘C?
The intial temperature : 59.865 °C
Further explanationHeat added :
Q = m . c . ΔT
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
[tex]\tt 305=94.8\times 0.128\times (85-t_1)\\\\85-t_1=25.135\\\\t_1=59.865^oC[/tex]
how does the VSPER theory explain molecular shape
A. Electron pair attractions pull atoms together
B. Electron pairs repelling each other push atoms apart
C. Valence electrons modify core electron orbitals
D. Intermolecular forces distort electron bonds
Answer:
B. Electron pairs repelling each other push atoms apart
Explanation:
The VESPR theory explains molecular shape by suggesting that electron pairs repelling each other push atoms apart.
If an atom is bonded to two or more other kinds of atoms as in many covalent molecules and ions, the shape of the system is determined by the geometry of the bonds around the central atom.
The variations in the bond angles of such molecules is explained by the valence shell electron pair repulsion theory. All the electrons will orient themselves in such a way to minimize the electrostatic repulsion between them. The repulsions determines the geometry of the covalent bonds around the central atom.What element has 4 energy levels and 8 valence electrons?
The element having 8 valence electrons and 4 energy levels is krypton, (Kr) it is a noble gas included in 18th group.
What is krypton?Krypton is 36th element in periodic table with main shell electronic configuration, K= 2, L= 8, M= 18 and N= 8 where, K, L, M and N are energy levels.
Krypton is in the group noble gases also called inert gases. The group members of Kr are, Helium, argon and xenon. Thus krypton is the element with 4 energy levels and 8 valence electrons.
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4. Which of the following ideas is NOT true? *
A. Atoms of the same element have a constant number of neutrons.
B. Atoms have a central, positively charged nucleus.
C. Atoms may gain or lose electrons to become ions.
D. Atoms of the same element have a constant number of protons.
Answer:
c
Explanation:
Answer:
the answer of the question is C
balance equation for complete combustion of butane
Is lysomes a plant or animals cell
Answer:
Animal
Explanation:
how do i write a c-e-r for this
Heating/Cooling curves can reveal information about the changes in kinetic and potential energy as
heat energy is added or removed. Kinetic energy is energy of motion that increases when heat is
increased. Kinetic energy changes when temperature changes (slopes). Potential energy is the
energy of position. Potential energy changes when temperature is constant (plateaus). Heat energy
added can either be used to change the speed of particles or the spacing of particles. Identify the
points on the heating curve where kinetic energy changes and where potential energy changes. Use
evidence from the simulation to support your claims about how energy is used at slopes and
plateaus.
Answer: it’s B for edge !
Explanation: took the test
Why and how are elements arranged in 4 period
Answer:
The reason for the arrangement of elements in the period is based upon the atomic number. In all periods, including the elements are arranged according to the atomic number in increasing order
Explanation:
Hope this helped!
Answer:
The reason for the arrangement of elements in the period is based upon the atomic number. In all periods, including the elements are arranged according to the atomic number in increasing order.
Explanation:
Which state of matter do mercury, orange juice and lava represent?
Answer:
they represent liquid state of matter.
Answer:
they state liquid state of matter .
hope it is helpful to you
what is the physical state of caesium at 35°c? Explain why
Can someone help me click the picture
Answer:
A product
B coefficient
C script
D rectant
can someone help me please i’ll give brainly
[tex]\huge\boxed{Option A}[/tex]
_____________________________________As the option says, the kinetic energy will decrease. the volume decreases because the molecules are slower and collide less. Less molecules make the effective collisions due to which the kinetic energy of molecules is less, so less kinetic energy results in the shrinkage. So decrease in temperature lowers the rate of the reaction and in the volume.
_____________________________________Best Regards,'Borz'P3- is a(n) ______________________, so it ________________ valence electrons. Group of answ er choices anion, gained cation, gained cation, lost anion, lost
Answer: anion , gained
Explanation:
When an atom accepts an electron negative charge is created on atom and is called as anion.
When atom loses an electron positive charge is created on atom and is called as cation.
Phosphorous (P) has an atomic number of 15 which means it contains 15 electrons and there are 5 valence electrons.
For formation of , the atom of phosphorous (P) must gain three electrons in its valence shell 3p so as to complete its octet
[tex]P:15:1s^22s^22p^63s^23p^3[/tex]
[tex]P^{3-}:18:1s^22s^22p^63s^23p^6[/tex]
Can someone help mee pleaseeeee please!
Answer:
im sorry dude, just trying to complete my daily challenge
Explanation:
While you were "sweating" your chemistry test, water vapor evaporates from your body, absorbing 50,000 J of energy. (assume no
temperature change). What mass of water evaporates?
A:O 150 g
B:O 22 g
C:11,962 g
D:O 105,000 g
Answer:
[tex]\boxed {\boxed {\sf B. \ 22 \ grams}}[/tex]
Explanation:
We need to use the formula for heat of vaporization.
[tex]Q=H_{vap}*m[/tex]
Identify the variables.
The heat absorbed by the evaporating water is the latent heat of vaporization. For water, that is 2260 Joules per gram. Q is the energy, in this problem, 50,000 Joules. m is the mass, which is unknown.[tex]H_{vap}=2260 \ J/g\\Q=50,000 \ J \\[/tex]
Substitute the values into the formula.
[tex]50,000 \ J=2260 \ J/g*m[/tex]
We want to find the mass. We must isolate the variable, m.
m is being multiplied by 2260 J/g. The inverse operation of multiplication is division. Divide both sides by 2260 J/g.
[tex]\frac{50,000 \ J}{2260 \ J/g} =\frac{2260 \ J/g*m}{2260 \ J/g}[/tex]
[tex]\frac{50,000 \ J}{2260 \ J/g} =m[/tex]
Divide. Note that the Joules (J) will cancel each other out.
[tex]\frac{50,000 \ }{2260 \ g} =m[/tex]
[tex]22.1238938 \ g =m[/tex]
Round to the nearest whole number. The 1 in the tenth place tells us to leave the number as is.
[tex]22 \ g \approx m[/tex]
The mass is about 22 grams, so choice B is correct.
can you guys help me
Answer:
B) 6 Newtons
Explanation:
Applied Force = 10 N
Resistive Frictional Force = 4 N
As we know that frictional forces always act in the opposite of the relative motion [force], and that opposite forces always subtract.
Hence,
The Net Force acting on the block = 10 N -4 N = 6 Newtons
Answer: The Answer is B
Describe what happens to particles of matter as you cool the matter to absolute zero (0K). In your description, be sure to explain the changes in kinetic energy and particles motion.
Explanation:
As you cool a matter to absolute zero, their kinetic energy reduces significantly and the molecules slows down and begins to aggregate together.
Cooling involves the removal of heat energy from a body. Heat increases the thermal energy of system. As heat is added, the molecules gain more kinetic energy. This shown in their increase motion. When heat is withdrawn, the particles slows down.How would an invasive species affect an ecosystem?
Group of answer choices
The invasive species would integrate easily into the ecosystem.
The invasive species would take over in the area and throw off the balance of the ecosystem.
The invasive species would balance the ecosystem.
The invasive species would change the abiotic factors in the area.
Answer:
The invasive species would take over in the area and throw off the balance of the ecosystem.
Explanation:
Invasive species can harm both the natural resources in an ecosystem as well as threaten human use of these resources. An invasive species can be introduced to a new area via the ballast water of oceangoing ships, intentional and accidental releases of aquaculture species, aquarium specimens or bait, and other means.
Invasive species are capable of causing extinctions of native plants and animals, reducing biodiversity, competing with native organisms for limited resources, and altering habitats. This can result in huge economic impacts and fundamental disruptions of coastal and Great Lakes ecosystems.
Hope this helped!
A dish is given to you, which contains a blackish yellow powder. When you move a magnet over it, black particles fly upwards and get stuck to the magnet. All that is left in the dish is a yellow powder, which you discover to be sulfur.
Was your original powder an element, compound, or mixture, and how do you know?
PLEASE ANSWER IF YOU HAVe an ANSWER OR NOt JUST FOR THE POINTS OR ELSE YOU WANT TO BE REPORTED!!!! please and thank you!
Answer:
It is a Mixture
Explanation:
It's a mixture because it was a substance made from mixing other substances together. And when the magnet went over the powder, the iron is lifted and not the sulfur. So the different parts of it can be separated by any physical means that allows the parts to seen separated
Answer:
its is a mixture
Explanation: because I did the question
A car is traveling at 50mph. How long will it take the car to travel 300 miles?
Answer:
6 hours
Explanation:
If it is traveling at 50mph and needs to reah 300 miles, to figure this problem out you would want to divide 300 by 50 to get 6 hours. So it will take six hours until the car travels 300 miles
Hope this helps.
Answer: A car travels at a rate of 50 miles per hour. how long will it take the car to travel 300 miles?
Explanation: .
Applying the distance formula:
d = rt
where
d is distance (300 miles)
r is rate (50 mph)
t is time (hours)
.
300 = 30t
300/30 = t
10 hours = t
Which is most likely the result of millions of metal atoms crowding together so that molecular orbitals become combined?
The formation of bands in a crystal
Explanation:
- hope that helped :)
What is the force needed to cause a 80kg object to accelerate at 1.6m/s??
Answer:
The answer is 128 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 80 × 1.6
We have the final answer as
128 NHope this helps you
How many moles are there in a 122 gram sample of nickel (Ni)?
7.16 x 103 moles
6.22 mol
2.08 mol
0.481 mol
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
Nickel:
The atomic number of nickel is 28.The symbol of nickel is Ni.Density of a nickel 8.908 g/cm3.It is a d block element.It belongs to group 10 and period 4.It is also called transition metal.It is a metal and is located between groups 2 and 3.Mass of nickel given: 122 grams.
Atomic mass of nickel: 58.71 g mol
Number of moles = Mass / molar mass
= 122/ 58.71
= 2.078
= 2.08 moles.
The atomic mass of nickel is 58.71 gm and the given mass of nickel is 122 gm. Therefore, 2.08 moles are present in a 122-gram sample of nickel.
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You can choose from four different materials to make the handrails that run up the stairs and around the playhouse: steel, aluminum, solid plastic, or pine wood.
2. Would you want to minimize or maximize the heat transfer to and from the handrails? Explain your reasoning.
Answer: The best material to make the handrails of the playhouse is Aluminum. This is because aluminum is an extremely versatile metal with a number of advantages, it is recognized for being both lightweight and flexible.
Explanation:
HOPE THIS HELPS!
ALSO THE OTHER ANSWER IS WRONG.
JUST SAYING >33