What is the primary source of light energy?
Question 2 options:
lightening
moon
electricity
the sun
Answer:
moon the sun.............hope it helps.......
Which color of light has the highest energy?
green
red
blue
violet
Answer:
Violet
Explanation:
It has the shortest wavelength and therefore the highest frequency.
who originally proposed the concept that matter is composed of tiny indivisible particles
Answer:
Aristotal
His view of atoms was very different from how we think of atoms now but he was technically the first person to propose the basic idea of atoms.
What happens when the light enters the water and then when it leaves the water?
Answer:
As light initially enters the water, it is refracted as in figure (b) and then reflected off the mirror (at the bottom of the glass). Upon exiting the water, the light is bent away from the normal as it passes from water (more dense) and into air (less dense).
Which common substance is an acid?
Question 3 options:
water
bleach
vinegar
baking soda
Explanation:
vinegar or acetic acid is an acid
Which electrons are represented by the dots in an electron dot structure?
a. valence electrons
b. inner level electrons
c. only s electrons
d. both a and c
Answer:
A
Explanation:
because valence electron is the outer shell of electrons.
hope this helps you to understand :)
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Answer:
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Explanation:
English
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Which change of state is taking place?
lose together but can slide
ms lose energy, they move
ocked in place because of
em.
gas to solid
gas to liquid
liquid to solid
solid to liquid
Answer:
gas to liquid is condensation
liquid to solid is freezing
solid to liquid is melting
gas to solid is deposition
Discussion: Bacteria vs. Virus
Instructions: Watch the video below.
In complete sentences:
-Tell me three facts you learned about viruses
-Based on the information we learned about cells, tell me two different ways that viruses are different from bacteria.
(Your response should be five sentences total.)
is the freezing of mercury reversible or irreversible
Answer:
reversible
Explanation:
The freezing of mercury is reversible because solid mercury can be melted.
What is the balanced chemical equation for the combustion of sulphur
Answer:
S+O2⇒SO2
Explanation:
Answer:
The balanced equation is S + O2 → SO2
Sodium belongs to Group I and Period 3 of the Periodic Table and iodine belongs to Group VII and Period 5. Based on this information, what can you tell about the atoms of sodium and iodine?
Explanation:
Sodium is a highly reactive metal since it has 1 valence electron, while Iodine is a less reactive non metal with 7 valence electrons.
a. Calcular el porcentaje en masa de una disolución que
contiene 20 g de azúcar en 280 g de agua:
Answer:
C po answer ko
Explanation:
thznk chou
in order for a substance to be an effective mobile phase in a chromatography experiment, it must be able to move
In order for a substance to be an effective mobile phase in a chromatography experiment, it must be able to move different components of a mixture at different rates.
Chromatography involves the separation of substances using the application of the solubility differences in them. It has two phases known as the stationary and mobile phases.
The mobile phase involves motion which is why the ability of substances to move at different rates is a great factor in this type of phase. The Stationary phase on the other hand doesn't involve movement of substances.
Read more on https://brainly.com/question/25194414
Explain why rubidium is less reactive than caesium.
Answer:
Like other alkali metals, rubidium metal reacts violently with water. As with potassium (which is slightly less reactive) and caesium (which is slightly more reactive), this reaction is usually vigorous enough to ignite the hydrogen gas it produces.
Explanation:
about chemistry notes
Answer:
what about chemistry notes?
Explanation:
why is propene the second member of the alkene homologous series?
why is it not ethene?
Answer:
Because alkenes are hydrocarbons with at least one carbon-carbon double bond the alkene homologous series starts at ethene C2H4.
Explanation:
La serie de Lyman se situa en la region ultravioleta del espectro. ¿Que linea quedara mas cerca de la zona visible del espectro? Explica por qué.
Answer:
Lyman series of hydrogen atom lies in the ultraviolet region, Balmer series lies in visible region, Paschen series lies in near infrared region whereas Bracket, Pfund as well as Humphrey series lie in far infrared region of electromagnetic spectrum.
Please help me.... someone deleted my question before so I'm trying again.
Answer:
See Explanation.
Explanation:
Element Name: Neon (check a periodic table)
Atomic Number: 10 (number of protons)
Atomic Mass: 20 (number of protons + number of neutrons [electrons have negligible mass])
Protons: 10 (P in the black circle)
Electrons: 10 (number of red dots)
Neutrons: 10 (N in the black circle)
Valence Electrons: 8 (number of red dots on the outermost ring)
If you have any questions, let me know!!
¿cuáles son las ventajas de un experimento científico?
Answer:
Explanation:
Hacer proyectos de ciencia ayuda a desarrollar el ingenio de un niño
Why
would scientists synthesize natural resources
Answer:
so that the can keep reusing it and reusing it instead of wasting materials
Explanation:
you very welcome have a good day
Two reactants, each having a mass of 50.0 g, react fully in a beaker. What is the total mass of the products in the reaction?
Answer:
100g......sieiekeskslapaokdkz
why all carbon containing atoms are not organic?
Answer:
Carbon oxides and carbonates are exceptions; they contain carbon but are considered inorganic because they do not contain hydrogen. The atoms of an organic molecule are typically organized around chains of carbon atoms. Inorganic compounds make up 1%–1.5% of a living cell's mass.
Answer:
They are made up of only one type of element, which is carbon, and therefore would fail to be categorized as an organic compound since they are not, in the first place,a compound, but a pure element.
what is the younger rock layer
The youngest rock layers are at the top and the oldest are at the bottom, which is described by the law of superposition.
If it takes 40 joules to heat a piece of barium weighing 20g from 10.0°C to 17.0°C, what is the specific heat of the barium?
Answer:
The specific heat of Barium is 0.204 J/g K
A woman is swimming across a cold lake. Her body temperature is 98 degrees and the lake water is 60 degrees. Which has more thermal energy, the woman or the lake? Explain your answer!
I think the lake because of how heat is transferred or something. Just check out the first law of thermodynamics.
Answer:
the woman
Explanation:
The fastest man can run 100 meters in 10 seconds. What is his speed in miles per hour?
Answer:22.37 mph
Explanation:
100 meters = 0.062137 miles
Assume constant speed over the distance.
0.062137 miles in 10 sec
0.372822 miles in 60 sec = 1 minute
22.36932 miles in 60 minutes
22.37 mph rounded to 2 decimals
Which is greater: the number of atoms in one mole of calcium, or the number of molecules in one mole of carbon dioxide (CO2)?
The number of atoms in one mole of Calcium and one mole of Carbon Dioxide is the same.
How to know the number of atoms?The number of atoms is determined by Avogadro's number (a constant number that determines the atoms per mole).
Avogadro's number is equivalent to 6.02 x 10²³ atoms.
This means one mole of each element contains 6.02 x 10²³. However, this number of atoms changes according to the amount of the substances or moles.
How many atoms does 1 mole of Calcium and 1 mole of Carbon Dioxide contain?
Considering these are two different substances but the number of moles is the same (1 mole each) the number of atoms is equal to Avogadro's number or 6.02 x 10²³ atom.
Learn more about atoms in: https://brainly.com/question/13981855?referrer=searchResults
How do gas laws predict absolute zero?
Answer:
If a gas contracts by 1/273 of its volume for each degree of cooling, it should contract to zero volume at a temperature of –273°C; this is the lowest possible temperature in the universe, known as absolute zero.It appeared that an “ideal gas” at constant pressure would reach zero volume at what is now called the absolute zero of temperature. Any real gas actually condenses to a liquid or a solid at some temperature higher than absolute zero. Therefore, the ideal gas law is only an approximation to real gas behaviour.
why is water able to easily dissolve ionic compounds?
Answer:
To dissolve an ionic compound
Explanation:
the water molecules must be able to stabilize the ions that result from breaking the ionic bond. They do this by hydrating the ions. Water is a polar molecule. ... When you place an ionic substance in water, the water molecules attract the positive and negative ions from the crystal.