Answer:
awsdxcvawsd
Explanation:
Answer:If you change the number of neutrons in an atom, you get an isotope of the same element. The addition of a neutron can make an atom radioactive. When you change the number of protons in an atom, you will change the atom from one element to a different element.
Explanation:
You are performing an experiment and produce an unidentified compound. You know it is composed of carbon, hydrogen, and oxygen but you do not know how many of each are present. You determine its relative formula mass is 59 g/mol. What is its molecular formula?
A. C2H3O2
B. C4H3O4
C. CH12O2
D. C3H4O
Answer:
C₂H₃O₂
Explanation:
Given the relative formula mass = 59g/mol
Unknown:
Molecular formula of the compound
Solution:
To identify this compound, let us find the molecular mass of the choices given.
The one that tallies with the number 59 is the solution:
For;
C₂H₃O₂;
Atomic mass of C = 12
Atomic mass of H = 1
Atomic mass of O = 16
Insert the parameters and solve;
Relative molecular formula = 2(12) + 3(1) + 2(16) = 59g/mol
So, the first choice is the compound.
An air-filled balloon shrank when moved from a warm room to a refrigerator. Which statement BEST explains why the balloon shrank?
A. The mass of the air decreased as the balloon cooled.
B. Internal pressure of the balloon decreased due to lower kinetic energy.
C. The volume of air decreased as the number of particles decreased.
D. External pressure on the balloon increased due to lower temperature.
Answer:
B. Internal pressure of the balloon decreased due to lower kinetic energy.
Explanation:
The balloon shrank when moved from the warm room to the cold refrigerator because the internal pressures of the balloon decreased due to lower kinetic energy.
As the balloon approaches the refrigerator, the particles begins to lose their heat energy. The kinetic energy of the particles in a body is directly proportional to the amount of heat. Since we move from a warm to a cold place, the kinetic energy drops too.Differences in states of matter are determined by
particle type
particle arrangement
particle color
distance between particles
Answer:
particle distance
solids are tightly packed
liquids are a little farther apart
and gases are very far
Which of the following is most likely NOT a chemical reaction?
(A)
A white powder and a clear liquid mix and the beaker holding the mixture gets cool to the touch
(B)
A white solid and a clear liquid mix and produce a bright orange, bubbling substance
(C)
A pan containing a clear liquid is place on a hot stove and begins to bubble after a few minutes.
(D)
A blue liquid and a green solid mix and produce a purple paste
Answer:
B is the correct answer because bubbling is a sign of chemical reaction and production of a new substance
Which types of reactions would result in the formation of precipitate?
Answer:
Double Displacement Reaction
Explanation:
A double displacement reaction is a type of chemical reaction in which the reactant ions exchange places to form new products. Usually, a double displacement reaction results in precipitate formation.
Which of the following is a physical change ?
• burning a piece of paper
• lighting a match
• chopping a piece of wood
• a rusting nail
Chopping a piece of wood
Physical changes are changes affecting the form of a chemical substance but not it's chemical composition.
Answer:
rusting nail: Rusting would only be a physical change if iron molecules remained pure iron throughout the process. Yeah your correct a physical change is anything seen or felt like changing the temperature of water a chemical change can also be seen also like if a iron nail rusts the nails iron atoms were chemically changed by oxygen.
lighting a match: Breaking a match in two pieces is an example of a physical change. Lighting a match and letting is burn is an example of a chemical change. Chemical reactions cause chemical changes. In a chemical reaction two or more substances, called the reactants, form different substances called products.
burning a piece of paper: Burning of paper is not a physical change. It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process. By the definition of chemical change, we come to know that during chemical change a new substance must form. These changes are irreversible in nature.
chopping a piece of wood: The chopping of wood is a physical change because as stated previously, any physical change can include cutting, bending, sharpening, etc. When a piece of wood is being cut, it undergoes one of these processes. The chopping of wood doesn't alter the chemical structure of the actual wood.
So Its chopping piece of wood!
Hope this helps!!True or False: The isotope with the greatest
abundance contributes to the atomic mass
reported on the periodic table more than
the isotope of lower abundance.
Answer:
True
Explanation:
Greater abundance means there is more of those isotopes, so they contribute to the average number more. The average number is the atomic mass.
With some manipulation, the Rydberg equation can be rewritten in the form
E=constant×(1nf2−1ni2)
which allows you to calculate the energy of the emitted light. Express this constant in terms of the constants h, c, and RH using relationships between wavelength and energy as well as the Rydberg equation from the introduction.
Express the constant in terms of h and c, and RH.
Please help me with this question?
Answer:
attached below is the detailed solution
answer : value of constant = 2.18 * 10^-18 J
Explanation:
Express the constant in terms of h and c and RH
attached below is the detailed solution
Constant = [tex]h_{C} R_{H}[/tex]
= ( 6.626 * 10^-34 ) * ( 3 * 10^8 ) * ( 1.097 * 10^7 )
= 2.18 * 10^-18 J
The Planck equation and the light speed allow us to find the results for the transformation of the Rydberg equation are:
[tex]E = A ( \frac{1}{n_1^2}\frac{x}{y} - \frac{1}{n_2^2} )\\A= R_H \ h \ c \\A = 2.18 \ 10^{-18} j[/tex]
The Rydberg equation is an empirical expression that explains the wavelength of the emissions.
[tex]\frac{1}{\lambda } = R_H ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )[/tex]
Where λ is the wavelength of the emitted radiation, is the Rydberg constant, n₁ and n₂ are integers with n₁ <n₂
It is asked to write the Rydberg equation for the energy.
Let's use the Planck relation.
E = h f
The light speed is related to the wavelength and frequency of radiation.
c = λ f
Where E is the energy, h the Planck constant, c the speed of light, λ the wavelength and f the frequency.
Let's substitute.
E = [tex]\frac{hc}{\lambda}[/tex]
[tex]\frac{1}{\lambda} = \frac{E}{hc}[/tex]
Let's substitute in the Rydberg equation.
[tex]\frac{E}{hc} = R_H ( \frac{1}{n_1^2} - \frac{1}{n_2^2}) \\E = R_H \ h \ c \ ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )[/tex]
We can write is an constant of the form.
A = [tex]R_H h c[/tex]
The value of the constant is :
A = 1,097 10⁷ 6,626 10⁻³⁴ 3 10⁸
A = 2.18 10⁻¹⁸ J
In conclusion, using the Planck equation and the light speed we can find the results for the transformation of the Rydberg equation are
[tex]E = A ( \frac{1}{n_1^2} - \frac{1}{n_2^2} )\\ A = R_H h c\\[/tex]
A = 2.18 10⁻¹⁸ J
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3. Which phase change requires the removal of energy? *
(1 Point)
condensation
evaporation
melting
sublimation
answer quick pls
Answer:
I'm pretty sure its condensation The energy absorbed causes the molecules to change patterns. hope i helped
Light travels at a speed of 3.00 x 100 ^10 cm/s. What is the speed of light in kilometers/hour?
Answer:
1.1 x [tex]10^{9}[/tex] km/h
Explanation:
Here we need to do two conversions- one from centimetres to kilometres and one from seconds to hours.
To get from cm to km- we divide by 100 000 since there are 100 000 cm in a km.
To get from seconds to hours we divide by 3600 since there are 3600 seconds in an hour
[tex]\frac{3*10^{10}cm/100000 }{1second/3600} =1.1*10^{9} km/h[/tex]
What is the percent composition of sulfur in H2SO4?
2.1%
B)
65.2%
C)
98.1%
D)
32.7%
Answer:
D (32.7%)
Explanation:
Answer:D (32.7%)
Explanation:
An atom can have 2.5 protons, as long as it also has 2.5
electrons.
TRUE. Or
FALSE
Solve for Keq , given the following concentrations at equilibrium. Based on the calculated Keq, are products or reactants larger?
CO2 = 3.0 M O2 = 1.5 M CO = 2.0 M
Answer:
it blows up very lighty
Explanation:
A team of geologist learn from GPS data that too continents can I have an ocean between them are moving toward each other Diego‘s little brother hears this and cannot believe that continents can move and is worried that those two continents are going to run into each other how can you explain to him what's happening
Answer:
Kindly check explanation section.
[tectonic activity].
Explanation:
What the team of geologists were talking about is known as the continental drift. The term continental drift which was introduced in the 1500s by people like Abraham Ortelius was mot accepted because the reasons backing it were not sufficient enough. The work on Continental drift was also worked on by people like Charles Lyell, Alfred Russel and Wegener. The term continental shift is used by geologists and other scientists to explain the movement of continents over time. The movement of continents is actually the movement on tectonic plates.
Although the movement of continents has not been accepted generally in those times, there has been modern evidence to back it up such as the record on fossils found in in several continents which are similar.
Diego‘s little brother should be told that different continents move at different rate and the movement is on the tectonic plates.
consider an iron cube and an aluminun cube. If the two cubes were at the same temperature, how would the average kinetic energy of the particles in iron compare with the average kinetic energy of the particles in aluminun
Answer:
I think there would be no differences
Classify the following chemical reaction
3 C + 4H2→ C3 H8
Answer:
Synthesis Reaction
General Formulas and Concepts:
Synthesis Reactions: A + B → AB
Decomposition Reactions: AB → A + B
Single-Replacement Reactions: A + BC → AB + C
Double-Replacement Reactions: AB + CD → AD + BC
Explanation:
Step 1: RxN
3C (s) + 4H₂ (g) → C₃H₈ (s)
We see here that we are combining 2 elements to form a compound.A would be C, B would be H₂, and C₃H₈ would be ABTherefore, we have a Synthesis ReactionWhich element am I? Give my symbol ONLY! What a robber says as he's running away!
Answer:
ummmmmmmmmmmmmmmm..mmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm
Explanation:
ummmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmmm.................... candyunicorns1999 has left the chat
Answer:
Bi
Explanation:
a piece of metal has a mass of 1.3 g/cm and a has a volume of 24.9 cm3 what is its mass
Answer:
34.611g
Explanation:
mass of metal = ?
density of metal = 1.39/cm³
volume = 24.9 cm³
density = mass/volume
mass = density × volume
= 1.39g/cm³ × 24.9 cm³
= 34.611g
what is the original name for gold
Answer:
It's Anglo Saxon.
Explanation:
From the Latin aurum, which stands for Aurora, the dawn goddess, comes the symbol Au. Early humans were aware of and highly valued gold. Gold is a beautiful and valuable metal that has been used for at least 5500 years. The original name for gold is Anglo-Saxon.
The element number 79 for gold is Au. Gold's Latin name, Aurum, or shining morning, and its earlier Greek origins predate the Anglo-Saxon term for it. It is one of the more abundant elements with a higher atomic number and exhibits very little reactivity towards the majority of atmospheric conditions, such as water and air.
Although gold is typically inert, it can react with a substance called aqua-regia. A substance called aqua regia is used to dissolve gold. Nitric and hydrochloric acids are combined to make them. The oxidizing agent will be nitric acid, which will result in the creation of gold ions.
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ASAP PLEASE HELP!!
Which substances will make a salt when combined?
A: Vinegar and Tea
B: soda and wine
C: soda and ammonia
D: fertilizer and detergent
Xx thank you! :)
Answer:
c
Explanation:
What physical property of the metal rods was being tested during step 4 of the procudure?
4. Measure and record how long it takes heat from the hot plate set on "high" to melt the wax ball.
A.
magnetism
B.
thermal conductivity
C.
electrical conductivity
D.
density
Answer:
B. thermal conductivity
Explanation:
They physical property being tested during the fourth step is the thermal conductivity of the materials.
Thermal conductivity is the ability of a body to transmit heat energy from one place to another.
Since we are measuring how long it takes for heat from the hot plate to reach the wax ball, this is a typical experiment for measuring thermal conductivity. Most metals are good conductors and heat energy moves fast in them.Non-metals are poor conductors with low thermal conductivity.HELPPP MEE I NEED HELPP PLEASE
Which person participates mostly in the quaternary level of an economy?
A. A coal miner
3. A car mechanie
C. A college professor
D. A car factory worker
SUBMIT
Answer:
B.Michanine
Explanation:
Answer: The answer is a college professor since people in the fourth level of industry create, share, and store information. They do research, give advice, report on events, and keep records. Furthermore, workers in the quaternary include teachers, librarians, accountants, scientists, and reporters, nor do the traits describe coal miners, car machines, and a car factory worker as these are the secondary level since their work involves manufacturing, make sure to study! You got this have a g’day. Again, the answer is C: A college professor.
Explanation:
What is the mass of 1.2 mol IrI3?
Answer:
690 g IrI₃
Explanation:
To convert from moles to grams, you have to use the molar mass of the compound. The molar mass of IrI₃ is 572.92 g/mol. You use this as the unit converter in this equation:
[tex]1.2molIrI3 * \frac{572.92g}{1mol} = 687.504 g IrI3[/tex]
Round to the lowest number of significant figures which is 2 to get 690 g IrI₃.
Question 8 (3 points)
Cindy dropped a test tube during a lab in science class, spilling its contents on the
floor. She immediately picked up the broken glass and used paper towels to clean up
the spill before redoing her lab.
How should she have handled the clean up?
Answer: she should‘ve called the teacher over to deal with it because she could have gotten cut and the chemical could’ve been dangerous
Explanation:
I NEED THESE ANSWERED!!! PLEASEEE!!!!!
pls help ill mark as brainliest :)
Q7. Pb + O2 PbO2
Is this combustion, single replacement, double replacement, synthesis, or decomposition
Answer:
This is a synthesis reaction.
Explanation:
Two elements are bonded together to form (synthesize) a new compound.
The number of shovels and cost per 1000 kg for
Ca(OH)2
Answer:500
Explanation:
40 POINTS!! Choose all the answers that apply.
Light _____.
travels in longitudinal waves
does not require a medium to travel through
slows down when traveling through more dense substances
speeds up when traveling through less dense substances
can be absorbed and transformed into heat
is refracted when it changes direction and speed
Answer:
The correct answers are:
does not require a medium to travel through
can be absorbed and transformed into heat
is refracted when it changes direction and speed
Hope this helps, have a great day and stay safe! :) :D :3
Answer:
B,E, and F
Explanation:
does not require a medium to travel through
can be absorbed and transformed into heat
is refracted when it changes direction and speed
TRUST : )
NEEEDDDD HELP ASAP PLZ PLZ PLZ PLZ PLZ HELP ME
Answer:
[tex]ns^2[/tex]
Explanation:
A neutral atom has 37 electrons. How many protons does the
atom have?
Answer:
37
Explanation:
because when an element is neutral it contains thesame amount of protons and electrons.
The number of protons in the given neutral atom is 37.
Explanation:
Atom is made up of three subatomic particles: protons, electrons, and neutrons.Protons are positively charged, electrons are negatively charged and neutron has no charge.Atom is electrically neutral as it contains an equal number of electrons and protons.The atomic number of an atom is equal to the number of protons in an atom.The mass of the atom is equal to the sum of the number of protons and the number of neutrons.Given:
A neutral atom with 37 electrons
To find:
The number of protons.
Solution:
Number of electrons = 37
The given atom is neutral, which means that an equal number of protons and electrons are present.
Number of protons = 37
The number of protons in the given neutral atom is 37.
Learn more about subatomic particles here:
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