answer
the answer is C
explanation
this is because the oxygen makes up 46.1%of the earth's surface while silcon is 28.5% and the question says "what makes up" which means you should add them and it becomes 74.6% which Is approximately 75%
Which word describes an artificial pond with raised edges used for agriculture?
shaduf
paddy
aqueduct
chinampa
Answer:
Paddy
Explanation:
he word paddy is used to describe an artificial pond with raised edges which are used for agriculture.
The word describes an artificial pond with raised edges used for agriculture is paddy. Therefore, option B is correct.
What do you mean by an artificial pond ?Seldom do artificial ponds have a natural outflow and entrance. This indicates that they only get fresh water from rain and direct activity, such a partial water change.
Ponds have a variety of functions, including providing water for farming and livestock, assisting in habitat restoration, acting as fish hatcheries, being parts of landscape architecture.
The paddy ponds are man-made ponds with elevated sides that are utilised for agriculture. These ponds are primarily used to easily supply crops with a suitable amount of water. These ponds are kept full of water, and rainwater is also collected and stored there.
Thus, option B is correct.
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In paper chromatography, is the substance being tested the solute or the solvent?
Answer:
Explanation:
This is an awfully good question. Think carefully about which is which.
A solvent is something that will dissolve the solute.
So the solvent will carry the solute up (say) chromatography paper. It is the solute.
the number of electrons if not ionized
Your answer
Answer:
What????
Explanation:
20 characters
elements Combine with atoms with F in the same ratio as atoms of Mg
Answer: Chemical symbols are used to represent atoms and elements. A compound consists of atoms of two or more elements combined in a small, whole-number ratio. Atoms of each of its elements are always present in the same ratio
Explanation:
Predict which surface will melt ice faster. Wood or metal? Why?
Answer:
I believe wood wood melt it faster. Why, because of how compact it is. It would be warmer. Metal would be a cooler temperature.
Explanation:
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Answer:yyyyyyyyyeeeeeeetttttt you will figure it out
Explanation:
Why is the reactivity of metal increase but that of non-metal decreases as we go down in a group of periodic table? (pls its important i need this question's ans for my exam so answer it fast thank you)
Answer:
Nonmetal reactivity decreases down a group because the nucleus' ability to gain more valence electrons weakens due to more nuclear shielding. For Metals: the most reactive metals are those that can lose their valence electrons the most easily. ... Francium is the most reactive metal
Explanation:
Answer:
While moving from top to bottom in a group of the periodic table, the reactivity of non- metals decreases. ... Thus, the tendency of gaining electron/s in the valence shell decreases as well as the chemical reactivity also decreases on moving from top to bottom in a group of non- metals.
what is the total charge? plz help!
Answer:
0
Explanation:
Protons have a positive + charge.
Neutrons have a neutral (0) charge.
Electrons have a negative - charge.
In order to determine the charge of an atom, we only look for the protons and neutrons.
We are given 2 protons and 2 electrons
+2 charge + -2 charge = 0 charge.
This atom is a neutral atom.
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1. In the mathematical equation for transverse waves, the symbol neu represents ts the _________.
A. Energy
B. Frequency
C. Speed of sound
D. Wavelength
2. What is the frequency of a 6.43 x 10^-5 m wave?
A. 4.66 x 10 ^ 12 hz
B. 5.5 x 10 ^ 7 hz
C. 1.03 x 10 ^ 4 hz
D. 1.2 10^15 hz
3. What is the wavelength of a 1.28 x 10^17 Hz wave?
A. 4.66 x 10 ^ 12 m
B. 8.1 x 10 ^4 m
C. 6.9 x 10^-8 m
D. 4.26 x 10^8 m
4. What is the wavelength of a wave having a frequency of 5.21 x 10^14 s-1?
A. 1.26 x 10^16 m
B. 7.1 x 10 ^ 7 m
C. 5.74 x 10^-7 m
D. 2.07 x 10 ^15 m
Answer:
1) wavelength
2) 1.03 x 10 ^ 4 hz
3) 8.1 x 10 ^4 m
Explanation:
Answer:
1) wavelength
2) 1.03 x 10 ^ 4 hz
3) 8.1 x 10 ^4 m
Explanation:
23 POINTS PLEASE ANSWER
Question:
Amy was observing the growth of five kinds of flowering plants on a windowsill. She noticed that some of the flowers on some of the plants turned toward the sun during the day, but the flowers on other plants did not turn toward the sun. She asked the following question.
“Why do living things sometimes change direction?”
Why is Amy’s question not a very good scientific question?
Options:
It is too broad.
It is based on her opinion.
It depends on moral judgments.
It leads to a hypothesis that can be tested.
Answer:
it was too broad
Explanation:
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ANSWER
it was too broad
please help!!!!!!!!!!!
Answer:
I think it is B
Explanation:
Both prokaryotes and eukaryotes have all of those things except for organelles, which only eukaryotes have (also prokaryotes are smaller not eukaryotes)
6. How many millimeters are there in 2.0 meters?
7. How many grams are there in 5.0 kilograms?
8. How many liters are there in 15.0 centiliters?
If the value of volume doubles but the mass stays
the same, the value for density will be
1.double
2.the same
3.halved
Answer:
halved
Explanation:
density decreases when volume increases if mass is kept constant density is defined as mass divided by volume.If the value of volume doubles, but the mass stays the same, the value for density will be halved. The correct option is 3.
What are volume, mass, and density?Density is the mass per unit volume. Density is a scalar quantity. It is denoted by d and the symbol for density is given as rho, a Greek symbol. Density is calculated as mass divided by volume.
Mass is the quantity of matter in a physical body. The product of the molar mass of the compound and the moles of the substance are defined as mass.
Volume is the space occupied by a three-dimensional object. Volume is calculated by dividing mass by density.
These three factors are related to each other. If two variables are given, the third can be calculated.
Thus, the correct option is 3. Halved.
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Which family does this element belong to? It sa reddish brown liquid with
an amber vapor, It is very reactive and it has a pungent odor that is
irritating to the skin, eyes, and respiratory
Alkali Metals
Alkaline Earth Metals
Halogens
Noble gases
Answer:
The correct answer is - halogen.
Explanation:
The physical properties of the given elements are identical to the physical properties of the free bromine which is a reddish-brown liquid that has a pungent odor and highly reactive. It has an appreciable amber vapor at 25 degrees (room temperature).
Bromine is a halogen and like other halogens, it is also present in the diatomic molecule and located in the 17th group or VII A group of periodic tables. Exposure of the bromine causes irritation to the eyes, skin and respiratory system.
Which are the basic physical sciences?
biology, paleontology, biochemistry and zoology
medicine, biotechnology, genetics and pharmacology
chemistry, physics, astronomy and earth science
Correct.
mathematics, statistics, logic and computer science
Answer:
Chemistry, physics, astronomy and earth science.
Explanation:
1.the study of blood serology
2.the development of digital storage and technology for use in bioscience applications biochemistry
3.the study of poisons genetics
4.the study and use of biological structures and processes for industrial purposes bioinformatics
5.the scientific study of heredity epigenomics
6.the study of the effects and interaction of the expression of genes toxicology 7.the study of the chemistry of organisms biotechnology
8.the study of decomposition of bodies after death anthropology
The various field of science include the following;
1. Serology.
2. Bioinformatics.
3. Toxicology.
4. Biotechnology.
5. Genetics.
6. Epigenomics.
7. Biochemistry.
8. Taphonomy.
"Fields of Science"Science is the interest and application of information and understanding of the normal and social world taking after a precise strategy based on prove.
1. Serology: The study of blood.
2. Bioinformatics: The development of digital storage and technology for use in bioscience applications.
3. Toxicology: The study of poisons.
4. Biotechnology: The study and use of biological structures and processes for industrial purposes.
5. Genetics: The scientific study of heredity.
6. Epigenomics: The study of the effects and interaction of the expression of genes.
7. Biochemistry: The study of the chemistry of organisms.
8. Taphonomy: The study of decomposition of bodies after death.
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Explain.Car side mirrors do not work when they are convered with frost. What does frost do no the surface of a mirror to cause a diffuse reflection?
The side mirrors play an important role in providing the safety of a car and also help the drivers to see the vehicles behind the car. Most of the side mirrors have a small heating element in them which helps to defrost or deice.
When ice, snow or even just condensation builds up on your mirror, it can severely limit your visibility. The frost makes the smooth surface of the mirror rough, so that the parallel rays are reflected in different directions.
There are extensive and multiple refractions which cause the distortion of light and so that the frost looks white, whereas ice is clear also called black ice due to the colour of road surface.
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what is dimensional analysis?
Answer:
the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.
Explanation:
What does nm measure in the spectra?
Answer:
The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).
Answer: Nanometer
Explanation:
The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (American spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).
...
Nanometer
imperial/US units 3.2808×10−9 ft 3.9370×10−8 in
If you know the volume and the density of an iron rod, how would you calculate the mass of that iron rod? Show a formula.
Answer: for an example
volume can easily be calculated: pi*(d^2/4)*length -> pi*[(7x10^-2)/4]*70x10–2 = volume of iron rod {VOIR}
Density = mass / volume
Therefore
Mass = density x volume
However, weight is equals to ‘mass x g (free fall acceleration’
So mass is in kg but weight is a force so simple force equation to where ‘a (acceleration)’ in ‘F=ma’ is ‘g’.
Hence,
Weight = 9.81 ms^-2 (is ‘g’) x 7870 kgm^-3 x VOIR m^3 is *insert calculated answer* N.
Explanation:
What is the difference between an element and a compound? Give an example of each.
please answer in a sentence.
Answer:
An element is a single atom by itself found on the periodic table. A compound is made when two or more elements chemically bond together. An example of an element is hydrogen. (H) An example of a compound is [tex]H_{2} O[/tex].
Explanation:
explained above
(C.6a) An atom of a neutral element contains 16 electrons. What element is it?
Answer:
Sulfur
Explanation:
state one factor that effects the rate of change of the liquid colour
Answer:
Temperature is one of the major factors that affects the rate of change of the liquid colour, this is because ; like when if you freeze hot water the ice formed will be clear transparent, while on the other hand, if we freeze cold water it would be foggy inside the ice. This change occurs because of the temperature difference of the cold and hot water.
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Number of paired electrons in Li
you find a 2cmsquared piece of pure gold with a mass of 38.6 g. what is it's density?
Answer:
First change cm in m and mass is 38.6g. Volume. =200m
Explanation:
Now,
Density =mass /volume
38.6/200
0.193 density
can someone help me please
All forms of energy can be ________into other forms of energy
a.transformed
b.energy transformation
c.transformations
d. conversation
e.thermal
f. kinetic and mechanicalscience
Answer:
A.
Explanation:
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Answer:
A. Is the correct answer.
Explanation:
It is correct because you would need to read the sentence over with all the choices you have. and transformed makes sense.
Can anyone answer this
Answer:
d
Explanation:
Substances exist as a solid, a liquid, or a gas because…
Sound waves move the fastest through which medium?
Answer:
Air/gas
Explanation:
Sound can travel faster through air/gas more effectively than solids or liquids.