which of the following below is an example of a chemical change?
a) heated metal glows red
b) pennies turn green overtime
c) butane is distilled from crude oil
d) soy sauce makes white rice turn brown
answer: (c) butane is distilled from crude oil
Explanation:
this is the answer because a chemical change is when the formula or what’s inside of it changes ( not what it looks like) so when the butane is token out of the crude oil it changes the formula
Give the electronegativity for the following elements of LI
Answer:
0.98
Explanation:
How many significant figures are in 15200 mL
Answer:
3
Explanation:
The zeros after 152 are not significant.
Arrange following steps of the Scientific Method into the proper order.
11. State the Problem
2. Conclusion
1 3. Data analysis
14. Hypothesis
15. Research
1 6. Experiment/data collection
what is the democritus findings?
nvm
nvm
nvm
nvm
nvm
nvm
nvm
The answer is given but I'd like to understand how one would get to the answer.
Answer:
Find the limiting reactant.
Explanation:
Using the ratio in the chemical formula, find the limiting reactant.
[tex]0.164mol Mn*\frac{2molMnO3}{2molMn} = 0.164molMnO3[/tex]
[tex]0.232molO2*\frac{2molMnO3}{3molO2} = 1.55molMnO3[/tex]
The second equation results in less mol of MnO₃, therefore it is the limiting reactant and changing the moles of O₂ to moles of MnO₃ which will give the theoretical yield which is 1.55 mol MnO₃.
Where does the carbon that you breath out as carbon dioxide come from? How does the Carbon enter your body?
Which statement best describes a physical property?
A physical property can be measured without changing the chemical makeup of the material
A physical property describes the product of a reaction between two substances.
A physical property describes the substance in terms of energy content.
A physical property of a substance varies from sample to sample
What does the number below each element's symbol represent?
A. The average number of isotopes
B. The average atomic mass
C. The average atomic number
D. The average mass of the ions
Answer:
B. The average atomic mass.
APEX
Answer:
The average atomic mass.
Explanation:
When energy changes from one form to another, it is called energy
A.radiations
B.transmissions
C.solutions
D.transformations
Answer:
(see below)
Explanation:
Using the process of elimination:
It's not energy radiations because radiation is a way energy is transferred.
It's not energy transmissions because that's the transfer of energy from one medium to another, like the sun to a black construction paper through radiation. There are three ways of transmission: radiation, convection, and conduction.
It's not solutions because a solution is a homogenous mixture where it is uniform in composition and appearance throughout. Also, the term "energy solutions" makes no sense whatsoever.
It's most likely energy transformations because energy transformation, also called energy conversion, is the process of changing energy from one form to another.
What are the important features of a model of Earth's plates?
Answer:
The main features of plate tectonics are:
Convection currents beneath the plates move the crustal plates in different directions. The source of heat driving the convection currents is radioactivity deep in the Earths mantle.
The important features of earth's plates are seismicity,volcanicity and tectonic activity along plate margins.
What are plate tectonics?It is a generally accepted scientific theory which takes into consideration earth's crust to be made up of tectonic plates. These plates move slowly and are moving since 3.4 billion years ago.
The model is developed on the concept of continental drift .Earth's lithosphere is split up in to seven-eight major plates and many minor plates.The position where plates meet their relative motion determines the plate boundary.
Tectonic plates are made up of lithosphere of ocean and thicker continental lithosphere.These plates are able to move because lithosphere has high mechanical strength.Lateral density variations occurring in mantle cause convection.
Learn more about plate tectonics here:
https://brainly.com/question/16926233
#SPJ2
Which lists the fractions 4/7 5/9 and 2/3 in order from least to greatest
True or False: A larger numerical value for electron affinity means it is more difficult for an electron to be added to an atom.
Answer:
i feel like it's false. i'm not quite sure right now, but i have a feeling that it's false. i hope i'm right.
Explanation:
Describe air using the terms: mixture, atoms, and molecules.
Answer: Here you go.
Explanation:
The atoms in molecules are joined by covalent bonds. Air is a mixture that contains the elements nitrogen, oxygen and argon, and also the compound carbon .
Hope this helps!
Explain the differences between an element, a compound, and a mixture – how many different types of atoms can be found in each? How are the atoms arranged?
Answer:
An element is something sound in nature a compound is something with more then one specific atom and can be made or found in nature, and a mixture is a few different atoms that can be separated from each other
Fakeium has four isotopes found on Earth but they’ve only been recently discovered. Do your part as a scientist and calculate the average atomic mass for fakeium so it can be added to the periodic table.
Fa - 85 is 31% of all the isotopes found.
Fa - 86 is 12% of all the isotopes found.
Fa - 87 is 38% of all the isotopes found.
Fa - 88 is 19% of all the isotopes found.
CHOICES:
84.65 g
87.00 g
87.50 g
86.45 g
Answer:
86.45 g
Explanation:
Given data:
Percent abundance of Fa - 85 = 31%
Percent abundance of Fa - 86 = 12%
Percent abundance of Fa - 87 = 38%
Percent abundance of Fa - 88 = 19%
Average atomic mass of Fa = ?
Solution:
Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+ (abundance of 3rd isotope × its atomic mass) + (abundance of 4th isotope × its atomic mass) / 100
Average atomic mass = (31×85)+(12×86) +(38×87)+(19×88) /100
Average atomic mass = 2635 +1032 +3306 +1672 / 100
Average atomic mass = 8645 / 100
Average atomic mass = 86.45
HELP ASAP PLEASE!!!! i really need help! :( Please help me this is due at 8:45 pleaseeeee!!! show all work!!
The photoelectric effect is an electron coming out of a metal because of electromagnetic radiation
One type of electromagnetic radiation is light
Frequency (f): the number of waves / second
Can be formulated :
[tex]\tt v=\lambda\times f[/tex]
v=fast wave propagation ⇒ speed of light =3.10⁸ m/s
λ= Wavelength
The energy can be formulated as
E = h x f
Where
E = energy of light, J
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves, Hz
1. λ = 4.82 x 10⁻¹⁰ m
the frequency =:
[tex]\tt f=\dfrac{v}{\lambda}=\dfrac{3.10^8}{4.82\times 10^{-10}}=6.22\times 10^{17}[/tex]
2. The energy
[tex]\tt E=6,626.10^{-34}\times 6.22\times 10^{17}=4.12\times 10^{-16}~J[/tex]
3. λ = 4.32 x 10⁻⁷ m
[tex]\tt f=\dfrac{3.10^8}{4.32\times 10^{-7}}=6.94\times 10^{14}\\\\E=6.626\times 10^{-34}\times 6.94\times 10^{14}=4.598\times 10^{-19}~J[/tex]
What force is responsible for the difference between the weight of each object in the air and its apparent weight in water?
Answer:
Buoyant Force
Explanation:
"Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of a partially or fully immersed object." - Google
9.Which part of the conductivity apparatus should you never touch
Answer:B- Leads
Explanation:
just did the quiz and got it right
What is the concentration that of chloride ions in a .193 m solution of potassium chloride
Answer:
solution of K3PO4?
1.31 m
2.
Concentration of Chloride Ions in a 0.193m solution of Potassium Chloride is _______.
0.193 m
3.
Concentration of Iodide ions in a 0.193 solution of Barium iodide is _________.
0.386 m
4.
In a Titration of 35.00 mL of 0.737 m H2So4, _______ mL of a 0.827 m KOH solution is required for neautralization.
62.4
5.
Consider the following reactions
AgNo3 ------>
Co(No3) ---->
AgNo3 ---->
Which is the correct order of increasing activity for these metals?
Ag < Co < Zn
6.
There are ______ Mol of bromide ions in 0.500 L of a 0.300M solution of AlBr3
0.450 m
7.
How many grams of Sodium Chloride are there in 550 mL of a 1.90 m aq solution of sodium CL?
6.11 g
8.
The total concentration of ions in a 0.250 M solution of HCL is _______?
0.500 m
9.
How many moles of Co 2+ are present in 0.200 L of a 0.400 M solution of Co I2
0.0800
10.
A Neautralization reaction between an acid and a metal hydroxide produces
Water and a salt
11.
7 Strong Acids
Claire HCl
Brian HBr
invented HI
nutrious HNo3
(3)candy HClO3
(2,4)sold H2So4
(4)profit HClO4
12.
8 strong bases
Lily LiOH Lithium Hydroxide
never NaOH Sodium Hydroxide
knew KOH PossasiumHydroxide
Robert RbOH
could ClOH
bake Ba(OH)2
strawberry Sr(OH)2
cake Ca(OH)2
13.
What are the spectators ions in the reaction between KOH(aq) and HNO(aq)
HF + OH ---> H2O + F-
14.
Combining Aq solution of BaI2 and Na2So4 affords a precipitate of BaSO4
Which Ions is/are spectator ions in the reaction?
Na + and I -
15.
The Spectator ions in the react between aq Hydrochloric acid and Aq Ammonia
Are ________
B. Cl - only
16.
Spectator ions of aq hydrofluoric acid and aq barium hydroxide are _________
D. Ba 2+ only
17.
Spectator ions in reactions
Aq perchloric acid and Aq barium hydroxide are >>>>>>>
ClO 4- and Ba 2+
To solve this we must be knowing each and every concept related to concentration and its calculation. Therefore, the concentration that of chloride ions in a 0.193 m solution of potassium chloride is 0.193 m.
What is concentration?There are two components in an aqueous solution: the solute and the solvent. You must be familiar with these two fundamental terminology for solution concentration. The quantity of solute present in the solution must always be recorded.
A solution's concentration can be expressed in a variety of ways. Chemists frequently work with moles when doing their tasks. In place of the number of moles, pharmacists will utilize percentage concentrations.
KCl[tex]\rightarrow[/tex] K⁺ + Cl⁻
concentration of KCl= concentration of K⁺= concentration of Cl⁻ = 0.193 m
Therefore, the concentration that of chloride ions in a 0.193 m solution of potassium chloride is 0.193 m.
To know more about concentration, here:
https://brainly.com/question/14803618
#SPJ5
Write a paragraph to explain the answer to the following prompt:
Imagine you are a scientist just teleported to a place that has no gravity. Write a journal entry to describe your experience. Consider how the lack of gravity might affect your weight. Do you still fit the definition of matter? Make sure to document your emotions!
Answer:
hinndndnnddnndndndnd do djfj
Explanation:
hdhdjdbdndndndjjddjdndjdjdndnndndndnd be rnnrbr
(First to answer gets some good) Order the following components of the universe from largest to smallest: Moon, planet,universe,star,galaxy,nebula,comet!
Answer:
Universe, galaxy, solar system, star, planet, moon and asteroid.
Explanation:
You're welcome!
give me the if, then statement to the picture below.
I NEED HELP ASAPPPP
Answer:
if we take away the web, we can slide down
Explanation:
(15 Points!) Match the electron configurations with the correct element name.
[tex]1s^22s^22p^63s^23p^63d^74s^2[/tex]
[tex]1s^22s^22p^63s^23p^63d^{10} 4s^24p^64d^15s^2[/tex]
[tex]1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}4f^45s^25p^66s^2[/tex]
[tex]1s^22s^22p^63s^23p^63d^{10}4s^24p^2[/tex]
Choices:
Cobalt (Co)
Germanium (Ge)
Yttrium (Y)
Neodymium (Nd)
Answer:
Using a lil common sense bcz I have no book sense on this...
Explanation:
Cobalt (Co) - 1
Germanium (Ge) - 4
Yttrium (Y) - 2
Neodymium (Nd) - 3
I Just looked at which comes before which in the periodic table and obv the one with less length from (1-4) is the lowest in the periodic table continuing... yah digg... lol
Here you go rats....
Answer: Why exacly am i a rat
Explanation:
,....
but thanks
Answer:
what!!!??????
How is eight molecules of Sulphur written
8S8 or 8S
To solve this we must be knowing each and every concept related to molecule. Therefore, eight molecules of Sulphur is written as S[tex]_8[/tex].
What is molecule?A molecule is an electrically neutral collection of two or more atoms linked together by chemical bonds. Here are several instances of molecules, as well as an explanation of the differences between particles, compounds, and ions.
An atom is indeed the element's smallest unit. A single element's atoms all have the same amount of protons. Atoms cannot be separated further using any chemical process. A molecule, on the other hand, is the basic unit of such a pure material. Eight molecules of Sulphur is written as S[tex]_8[/tex]. 8s is wrong representation.
Therefore, eight molecules of Sulphur is written as S[tex]_8[/tex].
To know more about molecule, here:
https://brainly.com/question/14130817
#SPJ2
Doctors are seeing an alarming increase in the number of cases of tuberculosis (TB) that is resistant to drugs commonly used to treat the disease. TB is difficult to pass to other people without prolonged contact, but it is often fatal if it is not treated.
How will doctors most likely respond to someone who has an active case of drug-resistant tuberculosis?
Answer:
Doctors will use other drugs that are known to be able to treat TB, even if they are less effective than the common drugs.
Explanation:
When a case of drug resistance is established, the doctor has to change the prescription and give other drugs that are also known to be effective against the organism.
Bacterial drug resistance is a common clinical experience. Many established drugs have been found to be ineffective in treating common infections leading to the continuous quest for improved antibiotics that are active against most organisms.
When doctors discover that someone who has an active case of drug-resistant tuberculosis, the doctor may need to change the prescription to other drugs that are also known to be effective against Mycobacterium tuberculosis, the causal agent of tuberculosis.
Learn more: https://brainly.com/question/2124849
Is nickel ferromagnetic How do you know?
Answer:
please mark brainliest!
Explanation:
The element Nickel (Ni) is one of the few ferromagnetic metals. Ferromagnetic means they are attracted to magnets and can be magnetized themselves. Most metals aren't magnetic with the exception of iron, nickel, cobalt, gadolinium, neodymium and samarium.
Answer: ummmmmm
Explanation:
what property of does honey possess that makes it resist from flowing
in form of solid form honey possess
Answer:
Honey
Explanation:
Honey is an ancient remedy for the treatment of infected wounds, which has ... The antimicrobial properties of honey have been known to humans for ...
Abstract
Introduction
Composition
Honey production and ...
Physical properties of honey
Honey as food
Microbes in honey
A chemical change always involves a change in the ____ of matter