Answer:
A is the correct answer.
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.
11:48 Tue 24 Aug
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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
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
Why are intensive properties useful for identifying a substance?
a
They are chemical properties.
b
They describe the amount of substance you have.
c
They are physical properties.
d
They do not depend on the amount of substance you have.
Answer:
d
They do not depend on the amount of substance you have.
Intensive properties useful for identifying a substance because they do not depend on the amount of substance you have.
WHAT ARE INTENSIVE PROPERTIES:
Intensive properties are physical properties of a substance that do not depend on the size or amount of a sample e.g. density, temperature, colour, boiling point etc. On the other hand, extensive properties are dependent on the size of a substance e. g. mass, volume, weight etc. Intensive properties of a substance do not change with respect to size, hence, they can be used in the identification of a substance.Learn more: https://brainly.com/question/3006850?referrer=searchResults
A piece of metal has a volume of 30.0 cm and a mass of 252 g . What is its density?
What metal do you think this is?
density = mass/volume
252/30 = 8.4 g/cm3
The metal is likely to be Nichrome
What is Density?
The Density of a material is the mass per unit volume
say the mass is m kg
and the volume is v cm^3
Then the density is
Density = mass/volume
Given data
Mass = 252g gram
volume = 30 cm^3
Hence the density can be calculated as
Density = 252/30
Density = 8.4 g/cm^3
From the value, this corresponds to the density of Brass
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What does it mean to be in the path of totality?(1 point)
You are on part of Earth that can see a total lunar eclipse.
You are on part of Earth that can see a partial lunar eclipse.
You are on part of Earth that is in the umbra of the moon’s shadow.
You are on part of Earth that is in the penumbra of the moon’s shadow.
To be in the path of totality means that
You are on part of Earth that is in the umbra of the moon’s shadow.The path of totality is the track the Moon's umbral shadow leaves across the surface of the Earth. Its width measures up to 200 miles and its length measures up to 10,000 miles.
When the moon covers the earth's surface, a total solar eclipse has occurred.
An individual who is on the path of totality can observe the occurrence of a total solar eclipse within a short while.
Summarily, a person who is on the path of totality can see a total lunar eclipse.
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. 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.
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.
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:
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.
What series does the following compound belong to?
Answer:
B
Carboxylic acid
Explanation:
I'm not entirely sure, but this should be it
When a liquid flows slowly, which of the following is accurate regarding its
viscosity?
A. it has a low viscosity
B. it has a high viscosity
C. it has a negative viscosity
D. it has a neutral viscosity
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
what evidence have you discovered to explain how the fossil record provides relative ages? use the words: mass extinction, superposition, fossils, and relative age
Answer:
Relative dating is based on the positions of fossils in rock layers. Lower layers were laid down earlier, so they are assumed to contain older fossils. This gives the fossil an approximate age in years. Absolute dating is often based on the amount of carbon-14 or other radioactive element that remains in a fossil up until extinction.
Relative dating is a method of dating where the geologic events are arranged and the rocks are left behind in a sequence. They function on the basis of the stratigraphy and don't provide us with actual numeric data.
It provides us with the relative ages such as mass extinction the fossils are superimposed. It is based on the position of fossils in the layers of the rocks.Learn more about the discoveries to explain how the fossil record.
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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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difference between atom and ion
plz plz answer
Answer:
Atoms are neutral; they contain the same
samenumber of protons as electrons. By
definition, an ion is an electrically charged
particle produced by either removing
produced by either removingelectrons from a neutral atom to give a
produced by either removingelectrons from a neutral atom to give apositive ion or adding electrons to a neutral atom to give a negative ion.
Explain what is meant by a weak acid
Answer:
A weak acid is an acid which dissociates partially to release few hydrogen protons or ions
Explanation:
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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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Write electronic configuration of first 30 elements in their sub shell
Answer:
Helium (He) 1s2
Lithium (Li) [He] 2s1
Beryllium (Be) [He] 2s2
Boron (B) [He] 2s2 2p1
Explanation:
please mark me brainleast
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.
Which variable do you change during an experiment? This is often associated with the IF part of the hypothesis.
Constant Variable
Control Variable
Independent Variable
Dependent Variable
d
Answer:
Independant variable
Explanation:
Say you were doing a lab, you wanted to know if fertilizer actually helped a plant grow. The growth of a plant, in this situation, depends on whether you use fertilizer or not. You are changing if you use it or not, so it is the independent variable.
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:
Someone plz help me !!
Science
Or
Bias?
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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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
GABReva 2. Explain the usefulness of friction
Answer:
Friction always slows a moving object down. ... Friction can be a useful force because it prevents our shoes slipping on the pavement when we walk and stops car tyres skidding on the road. When you walk, friction is caused between the tread on shoes and the ground. This friction acts to grip the ground and prevent sliding.
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
What is the overall charge of the
nucleus?
A. positive
B. negative
C. neutral
This is an image of ice
cubes made of water. Is
water (or ice) a mixture or a
compound made up of
molecules?
А.
a mixture
В.
a compound made up of molecules
Answer:
it is a compound made up of molecules
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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