Answer:
Infrared radiation → A) used to detect the location of objects
Microwaves → D) Used in radar and to heat food
Ultraviolet light → C)Given off by very hot objects, such as the sun Heat from warm objects
Visible light → B) All the radiation humans can see, ranging from red to violet
Explanation:
Microwaves have magnetic waves with very long lengths, greater than that of infrared light. These waves are produced through vibrations that produce heat, as the microwave is turned on, which allows the food to be heated. These waves are also used to provide communication on some types of devices.
Infrared radiation is a type of non-ionizing radiation that has a low frequency and therefore cannot be visualized, since it is not within a visible electromagnetic spectrum, having a frequency lower than red. It can be used to detect the licalization of objects and does not pose a health risk.
Ultraviolet radiation is extremely harmful to our body. It is characterized by radiation with very small wavelengths, less than 400nm. This type of radiation can be released by the sun and ultraviolet lamps.
Visible light refers to the simplest form of electromagnetic wave and covers all the radiation that our eyes can see, allowing different colors to be seen in the objects we observe according to the reorganization of atoms and molecules.
Answer:
A=Microwaves
B=Ultraviolet light
C=Visible light
D=Infared radiation
Explanation:
A) Used in radar and to heat food
B) Given off by very hot objects, such as the sun
C) All the radiation humans can see, ranging from red to violet
D) Heat from warm objects, used to detect the location of objects
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Why are some isotopes stable and others not stable
Answer: Many elements have one or more isotopes that are radioactive. These isotopes are called radioisotopes.
Answer:
Many elements have one or more isotopes that are radioactive. The isotopes are called radioisotopes
The statement "If I put fenders on a bicycle,
then they will keep the rider dry when riding
through puddles" is an example of
A. an observation.
B. a hypothesis.
C. a theory.
Which of the elements from above (S,Cu, Ar) are considered unreactive? (Explain why using the
concept of valence electrons)
Answer:
Ar
Explanation:
Valence electrons in an atom or element play important role in making an element reactive or unreactive. Valence electrons are the electrons present in the outermost shell of the atom that participates in a chemical reaction and forms a chemical bond with other atoms. Elements having no valence electrons are stable and acts unreactive.
Argon or Ar is the unreactive element from the given elements because there are no valence in argon and all the three electrons shells are full. Electronic configuration of Ar is [Ne]3s23p6 which shows the stability of argon.
Hence, the correct answer is "Ar".
What is a Hypothesis?
Answer:
A hypothesis is a claim you make about what you think is going to happen in an experiment.
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Calculate the energy of a light having a wavelength of 6.80 x 102 nm.
Answer:
Energy, [tex]E=2.92\times 10^{-19}\ J[/tex]
Explanation:
Given that,
The wavelength of a light is [tex]6.8\times 10^2\ nm[/tex]
We need to find the energy of light. The formula for the energy of light is given by :
[tex]E=\dfrac{hc}{\lambda}\\\\E=\dfrac{6.63\times 10^{-34}\times 3\times 10^8}{6.8\times 10^2\times 10^{-9}}\\\\E=2.92\times 10^{-19}\ J[/tex]
So, the energy of a light is [tex]2.92\times 10^{-19}\ J[/tex].
Describe two substances that are useful because of their viscosity
Which is always the first step in dealing with an accident in the lab?
A. Call the emergency number, 911.
B. Call the fire department.
C. Notify the teacher.
D. Read the MSDS information.
There are many different kinds of metals found inside the Earth. Gold and silver are two metals used in jewelry because of their shiny appearance and their ability to bend and shape easily. Which of the following characteristics represents the ability of a substance’s shape to be bent?
A. luster
B. boiling point
C. melting point
D. malleability
Answer:
it is ductile
Explanation:
because malleability is made into thin sheets
9. Use dot and cross diagrams to represent the following compounds.
a. Sodium chloride (NaCl)
Answer:
I have attached the diagram
Use two analogies to describe quantized change.
Answer:
See explanation
Explanation:
1) A flight of stairs because there is a specific number of steps one may take at a particular time. That is, the number of steps that can be taken at a given time is not continuous.
2) The gear system of a car: The gear system of a car can only take whole number integer values. It is not continuous and only one level of gear can be attained at a given time.
The two analogies that I used to describe quantized change are;
- Notes on a Piano
- Digital Clock
Quantized change is simply means that the change is definite under certain restrictions such as the gears in our cars. This means that change comes in discreet amounts.
The 2 analogies that I can use to describe it are as follows;
1) Notes on a Piano; When we are turn on a piano, the notes on the piano are fixed and as such we can only play the notes that the keys can hit.
2) Digital clock; The representation of time in digital clocks is in terms of numbers which can be said to be discrete variables.
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Which group of elements should all have similar chemical behavior?
magnesium, strontium, and sodium
b) sulfur, phosphorus, and silicon
c) hydrogen, oxygen, and nitrogen
d) argon, helium, and neon
Answer:
the correct answer is D
what are the properties of a match before it's light on fire
Answer:
The fire sucks the match
Explanation:
It is peedo
When scientists obtain new information, what happens to an existing scientific theory?
It is revised
It is reevaluated
It becomes a law
It remains the same
Answer:
It is reevaluated
Explanation:
Because of this new evidence, the theory can change, so the scientists must reevaluate the theory
In humans, having freckles is dominant over not having freckles. Andrew does not have freckles. What is his genotype for freckles? A) ff B) FF C) fF D) Ff
Answer:
A)ff
Explanation:
its A bc, how you would write a dominate trait for having freckles is FF and how you would write a ressive(cant spell that word sorry) trait for having freckles is ff. if Andrew does not have freckles then he is a ressive, ff. and also my teacher told me that u always write a dominate trait before a ressive trait unless u r doing a tri hybrid cross or something else.
What happens to a liquid when you keep on cooling it until it changes?
Answer:
it turns into a solid
Are corals minerals? Why?
Answer:
yes they are minerals becomes they contain components that have things minerals contians.
Explanation:
If 6.00 g of carbon is burned completely, what volume of carbon dioxide gas is released at STP? 6.0 L 11.2 L 22.4 L 134.4 L
Answer:
11.2
Explanation:
Find molar mass of carbon 12.01 g/mol then divide by 6.00 g of Carbon, then divide by STP 22.4 L = 11.19 and round to sig fig = 11.2 L
11.2 L volume of carbon dioxide gas is released at STP. Hence, option B is correct.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
For this question, use the formula PV=nRT firstly, define your knowns (this requires you to calculate moles of carbon)
Molar mass of carbon = 12.01 g/mol
Moles carbon=[tex]\frac{mass}{molar \;mass}[/tex]
Moles carbon=[tex]\frac{6.00 g}{12.01 g/mol }[/tex]
Moles carbon= 0.4995836803 moles
P=101.3 kPa
V=?
n= 6.0÷12 = 0.5
R= 8.31
T= 273 K
V= (0.5 x 8.31 x 273) ÷101.3
=11.19
Therefore, 11.2 L of carbon dioxide will be produced.
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what is a divalent union
Answer:
. A divalent cation is an cation with valence of 2+. This type of ion may form two chemical bonds with anions.
Explanation:
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Explain how balancing chemical equations relates to the law of conservation of matter.
Answer:
Normally, it explains that matter cannot be created or destroyed. It demonstrates different chemical reactions that help show the different transformations of the matter but will never destroy it or create it.
The electron configuration for aluminum (Al) is shown below:
1s22s22p63s23p1
Which diagram shows the correct distribution of electrons in the electron shells of an aluminum atom?
A small orange dot is surrounded by 5 concentric circles. The inner ring has green dots at the north and south positions. The second ring has green dots at east and west. The third ring has six dots, at the north, northeast, southeast, south, southwest, and northwest. The fourth ring has dots at the north and south, and the outer ring has one dot at the west position.
A small orange dot is surrounded by two concentric circles. The inner circle has 6 green dots spaced approximately evenly across the circle. The outer circle has 7 dots, also approximately evenly spaced; none are aligned with dots in the inner circle.
An orange dot has 3 concentric circles surrounding it. The innermost circle has green dots at the north and south positions. The center circle has 8 dots spaced unevenly. The outer circle has three dots, spaced so that two are closer to each other than either is to the third.
An orange dot is surrounded by a concentric circle. 13 closely spaced green dots lie on that outer circle.
Answer:
It is the third choice
Explanation:
Just did assignment
Answer:
It's C
Explanation:
This electron cloud model of aluminum has _______ energy levels with _______ electrons on its outer energy level. A) 1, 2 B) 2, 3 C) 3, 3 D) 4, 8
Answer:
C
Explanation:
Have anice day
This electron cloud model of aluminum has 3 energy levels with 3 electrons on its outer energy level. Thus option C is correct.
What is electron cloud?Electron cloud model is a type of model of an atom in which the atom consist of nucleus surrounded by a group of electrons. According to this model, the position of the electron at any given time is not known.
This model explains the zone of probability which describe the location of electron due to uncertainty principle. This model is described by Albert Einstein, Max Planck and Niels Bohr that electrons transmit energy and its properties that linked to light and energy.
The number of electrons in an electrically-neutral atom is the same as the number of protons in the nucleus. The total electrical charge of the nucleus is +Ze, where e is the elementary charge equals to 1,602 x 10-19coulombs.
Every electron is influenced by the electric fields produced by the positive nuclear charge and have (Z – 1) negative electrons in the atom.
Thus option C is correct.
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By mistake, a quart of oil was dumped into a swimming pool that measures 25.0 m by 30.0 m. The density of the oil was 0.750 g/cm3. Assuming the oil spread into a uniform, thin layer over the water, how thick was the oil slick?
The oil slick thick = 1.257 x 10⁻⁶ m
Further explanationVolume is a derivative quantity derived from the length of the principal
The unit of volume can be expressed in liters or milliliters or cubic meters
The volume of the aquarium is almost the same as the beam namely:
V = length x width x height
1.06 quart = 1 L
1 quart = 0.943 L=0.943 x 10⁺³ m³
volume of oil = volume of swimming pool
0.943 x 10⁺³ m³ = 25 x 30 x h
[tex]\tt h=\dfrac{V}{A}\\\\h=\dfrac{0.943\times 10^{-3}~m^3}{25\times 30~m^2}\\\\h=1.257\times 10^{-6}~m[/tex]
Plants need to take in gases and release gases during their
everyday life processes. What part allows plants to do this?
Answer:
The Stomata
Explanation:
The Stomata is found in the leaves of plants and controls their gas exchange with the environment around them.
Find the answers to the Blanks in each box and give an explanation, use the formulas shown to answer this.
Answer:
yes find the blanks of formulas ATM is equals to 2152 came that is also is a 1 ATM is that can come so much of money in that close to 52 ke and 22 4l
How much space would one mole of grass take up?
Answer:
If there's a grass area in the shape of a square and one side is 8 metres how much would it cost to fill the grass with fresh gravel at $5/metre
Animals and Animal-like Protists share some characteristics. Tell how the organisms in these groups are the same? Why do you think scientists have placed them in different groups
Answer/Explanation:
Animals are multicellular heterotrophic organisms, meaning they cannot generate their own food, they rely on external sources of nutrition.
Protists are any eukaryotic organism that cannot be classified as an animal, plant, or fungus. The grouping is more used for convenience than anything else.
Like animals, animal-like protists can move freely and are heterotrophic. However, unlike animals, they are usually unicellular, and much simpler than animals
which characteristics of an element can be determined by considering only the element’s specific location on the periodic table?
Answer:
Gas, Solid, or liquid
Explanation:
all smart people i need help
Answer:
its b
Explanation:
Answer: the first box
Explanation:
Energy and wavelength have a (n)___
relationship
Which row in the chart below best
describes asexual reproduction?
3
2
1
4
Answer:
1
Explanation:
Asexual reproduction is the ability of an organism to produce offspring identical to themselves.
In asexual reproduction, the number of parents is one, and the generation of offspring is genetically identical to a single parent. Therefore, row (1) best describes asexual reproduction.
What is asexual reproduction?Asexual reproduction can be described as a mode of reproduction in which a new offspring is generated by a single parent. The new individuals generated are genetically and physically identical to each of their parents. Asexual reproduction can be defined as the mode of reproduction in which the production takes place of offspring by a single parent.
Asexual reproduction can be observed in both multicellular and unicellular organisms. This process does not include gamete fusion and no change in the number of chromosomes either. Asexual reproduction will inherit the same genes as the parent.
Characteristics of Asexual Reproduction are single parent, no fertilization takes place, occurs in a very short time, and grows rapidly. The offspring in asexual reproduction is genetically similar.
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