Answer:
they become more compressed with each other, forming a higher-pressure environment.
Explanation:
:)
When you pump air into the tire, it compresses the air, bringing the molecules in the air closer together.
Explanation:
Which tool can be used to measure the volume of a liquid to one decimal place?
a thermometer
a graduated cylinder
an Erlenmeyer flask
a test tube
Answer:B
Explanation:
Answer:
B. a graduated cylinder
compared to those
5. Electrons farther away from the nucleus in an atom have
closer to the nucleus.
O A. lower energy
OB. higher energy
O C. the same energy
O D. higher or lower energy, depending on the element
Explanation:
higher or lower energy, depending on the element
Answer:
B
Explanation:
A photon of 498nm was emitted from a silicon atoms. Calculate the energy of all the atomic levels of silicon and show that the atomic levels are quantized.
The Energy of a photon in an atomic level, E = hc / λ
where
h=Planck's constant =6.626 × 10^{−34}Js
c=speed of light=3×10^8m/s
λ = photon's wavelength (metres),
E={6.626×10^{-34}Js × 3× 10^{8}m/s / {498}m/s
E= 3.99×10^{-28}J
Because all the energy levels of electrons in an atom are quantized,and cannot exist on different values of energies between them. So, when an electron moves from one energy level to another, it would release or absorb a specific and same amount of energy. Therefore, the energy of all the atomic levels of silicon must be E= 3.99×10^{-28}J
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It is difficult to measure the volume of a gas
Answer:
Gases are more difficult to measure than liquids, because measured volumes are highly affected by temperature and pressure. Gas meters measure a defined volume, regardless of the pressurized quantity or quality of the gas flowing through the meter.
Explanation:
It is difficult to measure the volume of agas because measured volumes are highly affected by temperature and pressure.
what ways we can prevent rusting? Explain.
Answer:
By electroplating
Explanation:
The metal which requires to be protected from rust is connected to the anode while a lower metal in the series is connected to the cathode, the a complete circuit is made and current is passed through the circuit there by resulting to the coating of the metal at the anode.
HCl reacts with O2 as follows: 4HCl+O2→2Cl2+2H2O When 1.79 g of HCl reacts with 5.68 g of O2 , which statement applies?
the statements that are applicable are the ones that mention HCl being a limiting reactant, or the one that includes that the maximum amount of Cl gas that can be produced is 1.74g
Is thallium, TI, a solid, liquid, or gas?
Answer:
Thallium is a Solid
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:DD
What would most likely happen if the kangaroo rats
were killed off and removed from the food chain?
Answer:
Explanation:
The number of cactus plants would increase.
true or false? scientists who study processes that take millions of years cannot conduct experiments
Answer:
true
Explanation:
earth haven't been around for 1 million years yet
Answer:
true
Explanation:
they wouldnt be alive to complete the process
Please help thank you (15 points)
Answer:
D. The sun has less gravitational pull on Pluto because it is farther away.
Illustrate the law of law of multiple proportions using the formation of SO2 and SO3 by sulphur and oxygen
As illustrated from law of multiple proportion, the mass of the oxygen which combined with a fixed mass of the sulphur is in simple whole number ratio of 2 is to 3 (2:3).
The law of Multiple proportion states that when two elements combine to form more than one compound, the mass of the second element, which combines with a fixed mass of the first element, will always be ratios of small whole numbers.
To illustrate the law of multiple proportion from sulphur and oxygen, we use the given compounds.
The reaction of oxygen with sulphur to form SO₂ and SO₃:
[tex]S \ + \ O_2 \ -----> SO_2\\\\2SO_2 \ + \ O_2 \ ---> \ 2SO_3[/tex]
atomic mass of oxygen = 16 g
atomic mass of sulphur = 32 g
In the formation of SO₂:mass of sulphur = 32 g and mass of oxygen = (2x16) = 32 g
In the formation of SO₃:mass of sulphur = 32 g and mass of oxygen = (3 x 16) = 48 g
Notice, while mass of sulphur is constant, mass of oxygen changed.
The ratio of mass of oxygen in the given two compounds = 32g : 48g = 2:3
Thus, based on the law of multiple proportion, the mass of the oxygen which combined with a fixed mass of the sulphur is in simple whole number ratio of 2 is to 3 (2:3).
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explain the concept of dihyric alcohols
Answer:
An alcohol that contains two hydroxyl groups
How far will a dog travel in 8 hours at a speed of 4 meters/hour
Four bonding pairs around a central atom results in a ________.
After a scientist has drawn a conclusion, tests the conclusion, and is satisfied with the results,
what is the next step in the scientific process?
A.making a hypothesis
B.experimenting
C.communicating results
D.analyzing data
Answer: B
Explanation:
This is science not chemistry
That is actually physics because it talks about motion.
Hello please I need help
List of choices for questions 20-24: A. (1) CH3MgBr, (2) H3O , (3) CH3MgBr, (4) H3O B. (1) LDA, (2) CH3I, (3) H3O C. (1) CH3MgBr, (2) H3O , (3) NaBH4, (4) H3O D. (1) DIBAH, (2) H3O E. (1) NaOH, heat, (2) SOCl2, (3) CH
Answer:
h30
Explanation:
If during an experiment zinc was found to be more reactive than lead or copper, zinc would be considered the strongest _____.
a. oxidizing agent
b. reducing agent
c. spectator ion
d. All of the above
acho q a letra c
obs: não tenho certeza
A semiconducting material is composed of 105 g of Ga, 80 g of Al, and 92.0 g of As. Which element has the largest number of atoms in this material?
Answer:
What is Acellus? Acellus is a learning accelerator. It uses video-based lessons with cutting-edge technology to accelerate learning, elevate standardized test scores, reduce dropout rates and transition more students into careers and college.
All living organisms are made of
They are the smallest units of a living.
thing that can perform all life processes.
A. stones
B. cells
C. water drops
D. bricks
A mixture of copper sulfate and water is heated, leaving a residue of copper sulfate in the container. Which method was used to separate the mixture?
A. evaporation
B. chromatography
C. distillation
D. filtration
Evaporation.
Also, it is not set to be a certain letter as for abcd
Stowing items and come across an aerosol battle of hairspray what should you do?
You are stowing items and come across an aerosol bottle of hairspray. W should you do? Please choose all that apply. Stow the hairspray Raise an Andon Remove it and secure it with bubble wrap Place a Flammable sticker on the bottle Submit
HELP! Which atom would be neutral?
A - an oxygen atom with 9 electrons, 8 protons, and 8 neutrons
B - an oxygen atom with 4 electrons, 6 protons, and 4 neutrons
C - an oxygen atom with 8 electrons, 8 protons, and 9 neutrons
D - an oxygen atom with 16 electrons, 18 protons, and 16 neutrons
Answer:
an oxygen atom with 8 electrons, 8 protons and 9 neutrons
An atom is called as neutral when the number of electron is equal to number of proton . Thus option C is correct.
What is neutral atom ?
Atom is the smallest unit of an element which can not be seen in with your bare eyes, due to its wavelength.
A visible light wavelength is about 0.000001 meter, where the size of an atom is 0.000000001 which is much smaller than 0.000001.
An atom has a nucleus, means it is the mass of the atom.
An atom is composed of protons, neutrons, and electrons where the protons and neutrons are combinedly form nucleus and electrons are present surrounding the nucleus.
When the number of proton and electron of an atom will be same then it is called as neutral only in normal state, but in other condition it either gain or loss electron by developing charge on it.
Neutral atoms are Oxygen, Hydrogen, Lithium, Helium etc.
Hence, option C is correct.
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3. Based on the following balanced equation:
2 C H20 + 13 02 8 CO2 + 10 H2O
a. How many moles of O2 are required to react completely with 4.00 moles of C4H10?
3.00 6.00 8.00 10.00 13.00 16.00 20,00 23,00 26.00
b. How many moles of CO2 are produced after complete reaction of 4.00 moles of C H10?
3.00 6.00 8.00 10.00 13,00 16.00 20.00 23.00 26.00
c. How many moles of H2O are produced after complete reaction of 4.00 moles of C&H10?
3.00 6.00 8.00 10.00 13.00 1.6.00 20.00 23,00 26.00
Answer:
A. 26 moles O2
B. 16 moles CO2
C. 20 moles H20
Explanation:
a. 4 moles C4H10 x [tex]\frac{13 moles O2}{2 moles C4H10}[/tex] = 26 moles O2
B. 4 moles C4H10 x [tex]\frac{8 moles CO2}{2 moles C4H10}[/tex] = 16 moles CO2
C. 4 moles C4H10 x [tex]\frac{10 moles H2O}{2 moles C4H10}[/tex] = 20 moles H20
Use the coefficients of the balanced equation to make the convertions
Which subatomic particle is important in chemical building and helps determine chemical properties
Explanation:
Since Z is EXPLICITLY determined by the number of protons, massive, positively charged particles, present in the element's nucleus, the proton must be the greatest determinant. Of course, it is the electrons that actually do the chemistry, but Z defines the element.
The volume of a gas sample is 15 L while the temperature is 50 °C. If the temperature is changed to 30 °C and the pressure remains constant, what will the new volume be? Round your answer to the correct number of significant figures. (Don’t forget to convert the temperature to the Kelvin scale by adding 273 to the Celsius temperature.)
Convert temperatures to Kelvin
[tex]\\ \sf\longmapsto 50+273=323K[/tex]
[tex]\\ \sf\longmapsto 30+273=303K[/tex]
Using Charles law
[tex]\\ \sf\longmapsto \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
[tex]\\ \sf\longmapsto \dfrac{15}{323}=\dfrac{V_2}{303}[/tex]
[tex]\\ \sf\longmapsto V_2=\dfrac{15(303)}{323}[/tex]
[tex]\\ \sf\longmapsto V_2=\dfrac{4545}{323}[/tex]
[tex]\\ \sf\longmapsto V_2=14.07L[/tex]
Max puts cereal in a bowl and pours milk over it. Which term best describes Max’s bowl of cereal?
A. pure substance
B. homogeneous mixture
C. heterogeneous mixture
D. compound
Answer:
Heterogenous
Explanation: Because its not one uniform thing.
The term that best describes Max's bowl of cereal is a heterogeneous mixture.
A heterogeneous mixture is a chemical term that refers to those mixtures in which its components can be distinguished with the naked eye.
One of the distinctive characteristics of heterogeneous mixtures is that the substances that compose them retain their properties and can be separated by physical procedures such as:
FiltrationCrystallizationDecantationDistillationAccording to the above, Max's bowl is an example of a heterogeneous mixture because milk and cereals can be distinguished with the naked eye and these can be separated using a physical procedure.
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As the human population has grown. Earth's ecosystems and the balance
of natural cycles have been negatively affected. What are some
examples of how the social factors of sustainability (Fig. 1-3) could be
used to help repair environmental damage caused by humans?
40 POINTS I NEEDA ASAP
Why is it difficult to rub away any carbon atoms from diamonds?
Answer:
because diamond is the allotrope of carbon and diamond is the hardest substance in the world and it's melting point is very very high so it's difficult