Answer:
Photoelectric, Threshold
Explanation:
Your welcome
How many moles are there in 4.6g of sodium
Answer:
0.20moles
Explanation:
1 mole Na contains 23 g Na
23 g Na =1 mole of Na
1 g Na= 1/23 moles of Na
4.6 g Na= 1/23×4.6= 4.6/23=0.2 moles
Therefore 0.2 moles are present in 4.6 g of Na
Answer:
the 4.6g sodium has 0.2 moles
Why does the author include information about bread and sandwich wrappings in the article?
(A) to show that the scientific method is often used to understand things about food
(B) to provide an example of something that can be tested by the scientific method
(C) to demonstrate the problems that can be caused by improper seals and wrappings
(D) to help evaluate how the weight of bread can show how much moisture it has
Answer:
what is the story about actually.i think it's from ur lesson
Explanation:
certain breads mold easily...(fact)..
especially white bread., when exposed to any moisture, from refrigeration, or freezing..
when taken out of (cold environment), humidity in air causes molding because you take it from cold to/warm environment.
check expiration dates, keep refrigerated, and inspect 4 molding. Companies like WMART, buy in bulk, when on shelf, defrosts,, then has molding within expiration dates..
Which of the following is an example of climate?
The polar regions have long winters and short, cool summers.
Humidity levels are high today.
Canada experienced an unusually warm summer this year.
Tornados formed across Oklahoma yesterday.
Answer:
"The polar regions have long winters and short, cool summers."
Explanation:
Climate is the average of that weather. The climate record also includes extreme values such as record high temperatures or record amounts of rainfall.
For Climate example:
You can expect snow in the Northeast in January or for it to be hot and humid in the Southeast in July.
71. The density of osmium (the densest metal) is 22.57 g/cm². If a
1.00-kg rectangular block of osmium has two dimensions of
4.00 cm x 4.00 cm, calculate the third dimension of the block.
Answer:
y = 2.77 cm
Answer: The third dimension is 2.77 cm
which branch science consist of?
Answer:
Modern science is typically divided into three major branches that consist of the natural sciences (biology, chemistry, physics, astronomy and Earth science), which study nature in the broadest sense; the social sciences (e.g. psychology, sociology, economics, history) which study people and societies; and the formal ...
Explanation:
The four major branches of science are, Mathematics and logic, biological science, physical science and social science. The first branch is mathematics & logic.
define mitochondria.
Answer:
An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner part being folded inwards to form layers (cristae).
Explanation:
Which equation represents a decomposition reaction?
O 4P +502 → 2P205
O H2SO4 + 2NaOH → Na2SO4 + 2H2O
O 2C8H18 + 2502 → 16CO2 + 18H2O
O 6NaNO3 → 6NaNO2 + 302
There are various type of chemical reactions in chemistry like combination reaction , displacement reaction. One of these is the decomposition reaction. The correct option is option D.
What is decomposition reaction?Decomposition reaction is the one in which molecules breaks down in its constituent in presence of energy. Energy can be in any form, it can be light energy , heat energy.
Decomposition of water is done by providing electricity and the reaction is called electrolysis. Lysis means to break. To give decomposition reaction molecule must have more than one element.
The fourth reaction describe a decomposition reaction (NaNO3 decomposed to become NaNO2 and O2). First and third reaction are considered combustion reaction (reacting with oxygen). Second reaction is acid-base reaction.
Therefore, the correct option is option D.
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What is the energy of a light wave with a frequency of 9.8 x 10^20 Hz?
Answer:
Regions of the Electromagnetic Spectrum
Wavelength (m)Frequency (Hz)Radio> 1 x 10-1< 3 x 109Microwave1 x 10-3 - 1 x 10-13 x 109 - 3 x 1011Infrared7 x 10-7 - 1 x 10-33 x 1011 - 4 x 1014Optical4 x 10-7 - 7 x 10-74 x 1014 - 7.5 x 1014
How could you describe the changes that happen when carbon changes form from graphite to diamond
-it is a chemical change, but the intensive and extensive properties of carbon will be maintained
-it is a physical change, but the intensive and extensive properties of carbon will be maintained
-it is a chemical change, which could change some of the intensive and extensive properties of the carbon
-it is a physical change, which could change some of the intensive and extensive properties of the carbon
The correct answer is: it is a chemical change, which could change some of the intensive and extensive properties of the carbon.
To answer this question, we must bear in mind that a chemical change involves the breaking of bonds in a substance and subsequent rearrangement of atoms to form a new substance.
This is why we say that in a chemical change, new substances are formed. Another name for a chemical change is a chemical reaction.
Having said that, it is clear that as graphite changes to diamond, bonds are broken and carbon atoms are rearranged.
This rearrangement of atoms leads to different intensive and extensive properties for graphite and diamond. For instance, graphite conducts electricity but diamond does not conduct electricity. Also, diamond is much denser and harder than graphite. A physical change can not lead to change in some of the intensive and extensive properties of the carbon.
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A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level
4. The transition requiring the greatest energy change is
DONE
Intro
Answer
level 2 to 4
Explanation:
i guessed cause im just that cool
Someone plz help me !!
Science
Or
Bias?
Measurements of the heights of various plants in an experiment are called
Answer:
Option 1 Data
Answer:
data
Explanation:
that is the answer
please 5 stars
Why is it impossible for an element to have an atomic number of 110.5? (1 point)
A_ Exactly half of the isotopes would need an atomic number of 110, and half would need an atomic number of 111, which is very unlikely.
B_ Atoms of an element all have the same whole number of protons and neutrons.
C_ Atoms with atomic numbers greater than 100 are unstable.
D_ Atoms of an element all have the same whole number of protons.
Answer:
C
Explanation:
I asked my teacher
The number of protons in an atom are always whole numbers hence it is impossible for an element to have an atomic number of 110.5. The correct answer is option D: Atoms of an element all have the same whole number of protons.
We define the atomic number as the number of protons in an atom. The number of protons in all the atoms of en element must be a whole number.
There is no half proton in the atom hence we can not have an atomic number of 110.5.
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How to convert 104 Km to M
Answer:
m=104000
Explanation:
by 1km=1000m
104km=?
Now
104km=104×1000m
=104000m
Therefore,m=104000 ans
104 kilometers is equal to 104,000 meters.
A conversion factor is a ratio that shows how two different units of measurement relate to each other. You can convert a value from one unit to another by multiplying or dividing the original value by a conversion factor.
For example,
Since there are 1000 meters in a kilometer, we need to multiply the distance in kilometers by 1000 to convert it into meters.
So, to convert 104 kilometers to meters:
104 Km * 1000 = 104,000 meters
Therefore, 104 kilometers is equal to 104,000 meters.
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What series does the following compound belong to?
Answer:
B
Carboxylic acid
Explanation:
I'm not entirely sure, but this should be it
Which statement about metals and nonmetals is correct? (1 point)
O Metals and nonmetals can both be found in any column of the periodic table.
O Most metals are a solid under normal conditions, and most nonmetals are a liquid.
O Metals tend to be poor conductors of electricity, while nonmetals are strong conductors of electricity.
O Metals can be hammered into thin sheets, and nonmetals are brittle
Answer:
The answer is the 4th one
The statement about metals and nonmetals that is correct is: "The Metals can be hammered into thin sheets, and nonmetals are brittle."
Metals are found mostly towards the left hand side of the periodic table. Non-metal character increases as you move towards the right hand side of the table.
One common property of metals is that they are malleable; this means that they can be hammered into sheets while a common property of nonmetals is that most of them are brittle.
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Could someone plz help me
Answer:
A
Explanation:
B: not B. Opinions don't matter. Facts do.
C: its a consideration. It will limit the scope of the experiment. But it's not relevant to the investigation. Not C
D: You might want to contact some scientists to see what they think about your investigation, but randomly interviewing anyone and everyone is not the answer.
You want to do A for certain.
A car start from rest and covers distance of 100m after 10seconds.if the acceleration is 2m/s square, calculate the final velocity..
Answer:
20 m/s
Explanation:
solution,
initial velocity (u)=0 m/s
Distance covered(s)=100m
Time taken(t)=10 seconds
Acceleration (a)=2m/s²
Now,
By using first equation of motion, we have
v=u+at
=0+2×10
=20 m/s
I hope it helped U
stay safe stay happy
question : what are isotopes
Answer:
Isotopes are versions of the same element. They have the same number of protons and electrons as the element but different mass numbers and number of neutrons.
Explanation:
one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table.
place the letters on the spectrum below from least scientific two more scientific A. All living things are composed of one or more cells. We know this because every living thing examined to date has
been found to be composed of one or more cells.
B. If you break a mirror, you will have seven years of bad luck.
C. The Earth is flat. Anybody can see that!
D. Taking Vitamin C prevents the common cold. Linus Pauling, the Nobel laureate who discovered the structure of
Vitamin C, says it does.
E. Humans have a soul. I believe this because it says so in the Bible. The soul is what separates us from animals.
F. The rate of acceleration of all falling objects on Earth is constant. Two spheres of identical diameter and volume are
dropped from the top of a building; one is made of steel, the other made of a plastic polymer. They both will accel-
crate at the same rate (32 ft/s) and hit the ground at the same time.
Answer: B, C, E, D, A, F
Explanation: It is a little difficult to assign a regid order to these statements. Much depends on one's definition of "more scientific." My thoughts:
B: Only in the movies
C: Flat Earthers still exist, but no one has ever fallen off the edge, that I'm aware of
E: I've had a few pets with souls. My cat has it in for me.
D: I met Linus Pauling twice - he was too enthusiastic with his vitamin C and did not critically evaluate the evidence, but he was far more correct than the Flat-Earthers.
A: Lots of good evidence, although it can also depend on the definition of "living," Is a virus "living?"
F: Yep, I've done it myself. Heavier object have more inertia - they are the couch potatoes of physics. They will take their own time to get moving.
What do the nuclei of 1H hydrogen atoms contain?
protons only
electrons and protons
electrons and neutrons
neutrons only
Answer:
"Protons only"
Explanation:
Hydrogen has one proton in its nucleus. It does have one electron rotating outside of the nucleus, BUT NOT IN THE NUCLEUS. 'A' is the correct answer.
Polar molecules have partial positive and partial negative charges. An electrical
attraction between the partial positive charge of one polar molecule and the partial
negative charge of another polar molecule is called a/an
Answer:
Image result for Polar molecules have partial positive and partial negative charges. An electrical attraction between the partial positive charge of one polar molecule and the partial negative charge of another polar molecule is called a/an
A polar molecule has a net dipole as a result of the opposing charges (i.e. having partial positive and partial negative charges) from polar bonds arranged asymmetrically. Water (H2O) is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other.
Explanation:
during the interconversion of state of matter, mass undergoes and change? true or false
True.
The Mass Undergoes change only in ( Solid state to liquid state ) Ice Cube to Water .
Mass changes from mg to litre.
[tex]\huge\mathfrak\red{hope \: it \: helps}[/tex]
Which of the following statements correctly explains why the excretory system is different from the digestive system? (1 point)
The excretory system is different from the digestive system because it removes waste from the body by filtering water, which
includes mostly the by-products of metabolism.
The excretory system is different from the digestive system because it removes waste from the body by filtering urine, which
includes mostly the by-products of metabolism
The excretory system is different from the digestive system because it removes waste from the body by filtering food, which
includes mostly the by-products of metabolism. filtering food
SS
2
The excretory system is different from the digestive system because it removes waste from the body by filtering blood, which
o
includes mostly the by-products of metabolism
U.
Hey
Answer:
The excretory system removes waste from the body. remove waste from the blood. The digestive system breaks down the food you eat into nutrients that provide energy and building materials for cells. The digestive and excretory sytems work together to process the food that you eat.
this table resembles a condensed version of the modern periodic table. using the full periodic table as a reference, type the symbols for the elements from part A into this table based on their appropriate group and period.
Explanation:
H, He ---------
Li, Be, --,C, F, Ne
Na, Mg, --,Si, Cl, Ar
K, Ca, Cu, Ge, Br, Kr
Rb, Sr, Ag, Sn, I, Xe
Cs, Ba, Au, Pb, At, Rn
Please give brainliest, I spent a lot of effort on this.
Arrange the gases in increasing order of the number of atoms that make up its molecule, from left to right.
Cl₂-CH₄-SO₂-CH₂O-C₂H₄.
thank you!
Answer:
C₂H₄-CH₄-CH₂O-SO₂-Cl₂
Explanation:
The arrangement of gases in increasing order of the number of atoms that make up its molecule, from left to right, is C₂H₄-CH₄-CH₂O-SO₂-Cl₂.
What are gases?
Gas is one of the matters. It's invisible, and its particles are present very far away from each other. The atoms of the gas move randomly, and they are always in motion.
There are iii kinds of matter, solid, liquid, and gas. When there is a modification in temperature when there is a rise in temperature the solid becomes liquid and eventually, the liquid becomes gas.
The arrangement of gases in it increases the order of the number of atoms. So it can be identified by seeing the moles of elements that are shown in the chemical formula of gas.
Thus, the arrangement of gases is C₂H₄-CH₄-CH₂O-SO₂-Cl₂.
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11:48 Tue 24 Aug
47%
3. Graphite, aform of carbon, conducts electricity because it has:
(1 Point)
Answer:
carbon because it is the main answer of these
hi <3
graphite is able to conduct electricity because it has delocalised electrons.
explanation:
carbon can bond 4 times, but in graphite it is only bonding to three other carbons, leaving one electron free to carry charge
hope this helps <33
Which is most useful in classifying stars? (1 point)
A. knowing the movements of a star
B. knowing the size of a star
C. knowing the apparent magnitude of a star
D. knowing the color and brightness of a star
Answer:
B. Knowing the color and brightness of a star
Explanation:
. Arrange the following in order of increasing radius:
a) Mg2+, Na+, Al3+
b) Na+, Al3+ , Mg2+
c) Mg2+ , Al3+ , Na+
d) Al3+ , Mg2+, Na+
guys pls help i will venmo you money
Answer:
Al3+<Mg2+<Na+
Explanation:
this is because of nuclear charge (no. of protons)
atomic radius is inversely proportional to nuclear charge.
The amount of energy required to separate 1 mole of ions in a crystalline solid into separate gaseous ions is called _____ energy. This energy provides a measure of the strength of a(n) _____ bond, since the stronger the bond, the _____ the amount of energy required to break it.
Answer: A) Are you asking for the production of "ions" from a solid? Or are you asking for the formation of gases. For gases, this is called "energy of vaporization."
B) "Lattice," I am guessing.
C) Greater
Explanation: Most molecules enjoy their existance as solids (not all) due to the intermolecular forces that attract the molecules to each other. These are largely hydrogen and ionic bonds. Hydrophobic compounds don't always share this enthusiam to stick together. Gasoline is happy to leave it's relatives behind and it's Up, Up, and Away.
