Matter has changed size shape or form
a physical change is when you can see on the outside that a change is happening and you can set it back together like air
a chemical change is a molecular change that you cannot fix. like burnt chocolate
which type of electromagnetic radiation has the shortest wavelength?
A: Microwaves
B: Radio waves
C: Ultraviolet light
D: Visible light
The subject is science
Answer:
Explanation:
It's radio waves because the higher the frequency, the shorter the wavelength. From crest to crest, the wavelength of a radio wave is the shortest. The longest would be ultraviolet light, then visible light, then microwaves! And since radio waves have the highest frequency out of any of them, it has the shortest, look up photoelectron spectroscopy and you'll see! Hope it helps!
What is the name of the structure that holds the vocal cords?
Answer:
The answer is larynx. I believe it is anyways. Sorry if i'm wrong.
Answer:
The vocal folds, also known as vocal cords, are located within the larynx (also colloquially known as the voice box) at the top of the trachea.
Explanation:
Explain the importance of valence electrons in chemical bonding.
Answer:
Explanation: Understanding valence electrons is key to understanding chemical bonding. Delocalized valence electrons produce metallic bonds (bonds between atoms of metals) which give metals unique properties such as conductivity and ductility (draw metal into wires)
I need help please （o´・ェ・｀o）
Tantalum: 2
Niobium: 3
Dubnium: 1
Please make brainliest ?
methanol on reaction with acetyl chloride gives
Answer:
Explanation:
Ethanoyl chloride reacts instantly with cold ethanol. There is a very exothermic reaction in which a steamy acidic gas is given off (hydrogen chloride). Ethyl ethanoate (an ester) is formed.
The alkaline-earth metals react similarly because they all have the same number of electrons in their outer energy level. Which group contains the alkaline-earth metals?
A. Group 2
B. Group 1
C. Group 17
D. Group 18
Answer:
Alkaline-earth metal, any of the six chemical elements that comprise Group 2 of the periodic table. The elements are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).
Explanation:
A. Group 2 is the correct answer
Could cellular respiration
happen without photosynthesis? Explain your
reasoning
Answer:
No
Explanation:
Without photosynthesis, there would be no sugar, without which there could be no cellular respiration.Both animal cells and plant cells depend on cellular respiration for their energy needs, because both animal cells and plant cells need ATP.
As the number of protons increases but the distance between the protons and electron REMAINS THE SAME...
O the electronegativity stays the same.
O the electronegativity decreases.
O the electronegativity increases.
Answer:
The correct option is;
The electronegativity increases
Explanation:
The electronegativity is the measure of an atom's ability to attract a shared electron pair. The electronegativity of an atom is dependent on the atom's atomic number and the separation distance between the electrons in the valence shell and the positively charged nucleus such that an increase in the atomic number results in an increase in electronegativity and an increase in the distance between the valence electrons and the nucleus, leads to a decrease in electronegativity.
What is true about atoms when they bond? There may be more than one answer.
1. Bonded atoms can never be taken apart
2. Electrons can be transferred
3. They form compounds
4. Compounds have the same characteristics are the atoms that make it up
5. Electrons can be shared
Answer:
3. 5. and i think thats it
Answer:
3. 5. and i know it is right
Explanation:
Question 6 (1 point)
Sound, earthquakes, and waves in water are rechanical waves because they require
a physical to transport energy. (Lesson 4.02)
O electromagnetic field
O disturbance
O medium
location
Answer: The answer is MEDUIM
Explanation:
Check out this long-form version of the periodic table. It shows where the two rows of
elements from question 4 really belong in the periodic table. Think about the challenges of
using this version of the periodic table.
Which statement offers the most likely explanation of why the long-form version of the
periodic table is seldom used?
The elements in the separate group are so rare that they do not occur in nature.
The elements in the separate group have very little in common with one another.
The long-form version no longer keeps the elements in order of increasing atomic
number.
The long-form version is too wide to easily fit on a computer screen or sheet of
paper.
Answer:
The long form version is too wide to easily fit on a computer screen or sheet of paper
Explanation:
3 way to make bases
Which of the following is a subsurface event that takes place during the rock cycle?
Group of answer choices
Cementing
Erosion
Melting
Weathering
Answer:
Melting
Explanation:
Could not have been erosion because erosion happens on the surface.
Could not have been weathering because weathering happens on the surface.
So we only have Cementing and Melting left....
The answer is melting, I got 100% on my test.
Hope this helps!!!! :D
Please give brainliest!!!
Answer:
D
Explanation:
In the rock cycle, surface events takes place at the surface of earth. Thus,
weathering and erosion are surface events, while the subsurface events he take place in the deeper section of the earth . Examples of sub surface events are plate tectonics and mountain building or anything that takes place in the inner core of earth.
what further observation led mendeleev to create the periodic table
Answer:
;,knbbbknnbkhbln bhbj k; b; m j
Explanation:
Which of the following is not a controllable risk factor?
a. smoking
b. inactivity
c. aging
d. over eating
Answer:
C) Aging
Explanation:
You can't stop that or change the rate that you age at. its inevetable :D
how many moles is ( 1 x 10^9 ) molecules O2
Answer:
The answer is
[tex]1.66 \times {10}^{ - 15} \: \: moles[/tex]
Explanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\ [/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{1 \times {10}^{9} }{6.02 \times {10}^{23} } \\ [/tex]
We have the final answer as
[tex]1.66 \times {10}^{ - 15} \: \: moles[/tex]
Hope this helps you
Will give extra points and brainliest if you go in the comments and answer a few other questions
Answer:
5,293 km, A
Explanation:
B has no coma.
C is too overly touchy
Answer:
b
Explanation:
PLEASE HELPP hurryyyy
Answer:
A
Explanation:
Write the chemical formula for gold (I) sulfide.
Answer
Au2s
please mark me as brainlist
define atomic number
Answer:
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
When the dry ingredients of a cake are combined, what is the result? A.Element B.Mixture C.Compound D.Atom
A combination of dry ingredients of a cake results in a mixture.
A mixture is a combination of substances that are only physically but not chemically combined.
Mixtures are different from elements, compounds, and atoms because:
elements are pure substances consisting of a single type of atomcompounds are a mixture of different elements that are chemically combinedatoms are the smallest particle of an element.More on mixtures can be found here: https://brainly.com/question/24898889?referrer=searchResults
Answer:
Its mixture
Explanation:
Pls give me brainly ...
Geologists use the law of to determine the superposition relative ages of sedimentary rock layers
True or False?
6. Which of the following element pairs would most likely form an ionic compound? (5pts)
a. Ca and Ni b. Cu and Ar c. F and S d. Zn and K e. Na and Cl f. V and O g. He and Xe h. Sn and Na i. C and Br j. Sr and P k. Cr and I l. Ag and NO 3
Answer:
b
Explanation:
Speed of 5km. Pls help
Answer:
It's either A. or B. Im going with B. since the person is walking a constant speed
Explanation:
acceleration is basically when someone or something is increasing in speed
Am i right??
if i'm not pls correct me if i am tell me too
Answer:
You are right!!! Gj!
Explanation:
Answer:
you are right
Explanation:
see from google
what type of property can be observed only by changing a substance into a different substance
Answer:
Chemical (you should mark me brainliest lol)
Explanation:
Chemical properties can only be measured by changing substances chemical identity.
Are ionic compounds not carrying a charge?
Answer:
yes they carry charges
Answer please.
Need anwer due in 10 mins.
Which statement best describes John Dalton's use of creativity in his work? He reinterpreted and retested Joseph Proust's results. He used a philosophy to conduct his experiment. He recorded his results as four parts of the atomic theory. He rejected Democritus's idea that matter was composed of atoms.
Answer: The correct statement is that,
'He reinterpreted and retested Joseph Proust's results'
Explanation:
John Dalton was an English chemist who contributed greatly to the field of Chemistry. He published his theory about atom in 1808.
Dalton was the first person to recognize a workable distinction between the fundamental particle of an element (atom) and that of a compound (molecule). The atomic theory generally summaries the laws of chemical composition which includes:
--> law of constant composition and
---> law of multiple proportions.
John Dalton was being creative in his work by reinterpretation and retesting of Joseph Proust's results. Joseph Proust was a French chemist that first discovered the law of constant composition in 1794. This means that many has started working on the atoms before John Dalton discovery.
From the previous works of Proust, he had studied tin oxides and found that their masses were either 88.1% tin and 11.9% oxygen or 78.7% tin and 21.3% oxygen (these were tin(II) oxide and tin dioxide respectively). Dalton retested and noted from these percentages that 100g of tin will combine either with 13.5g or 27g of oxygen; 13.5 and 27 form a ratio of
Dalton reinterpreted it by finding an atomic theory of matter that could elegantly explain this common pattern in chemistry – in the case of Proust’s tin oxides, one tin atom will combine with either one or two oxygen atoms. I hope this helps, thanks.
Answer:
A.) He reinterpreted and retested Joseph Proust's results
Explanation:
how is sonoluminescence similar to what we see in fireworks?
Answer:
Explanation:
Sonoluminescence is a phenomenon in which small gas bubbles burst to produce light when intense sound wave is introduced. Thus, it can be said that sound energy is converted to light energy here. This is similar to the process of how fire crackers work except that sonoluminescence occurs in a liquid medium while firecrackers work in solid media. In firecrackers, when the tip is lit with fire, the initial explosion is caused by the expansion of some nitrogen and carbon present in some constituent compounds, this explosion produces heat which causes some other constituent chemicals in the firecracker to quickly react and produce light. Thus, this can also be said to convert sound energy to light energy and are thus similar to what occurs in sonoluminescence.