Answer:
number of electrons
Explanation:
(happy to help)
i need help guys hurry
Answer:
when an object is at sea level
Explanation:
wherever you are closest to the center of the Earth.
what does it mean when a reaction has a negative amount of Kj
Answer:
heat is released in going from reactants to products
Explanation:
hope this helps
What is the term for negative acceleration?
Answer:
negative acceleration describes a decrease in velocity over time. Acceleration is an increase and zero acceleration is no change in velocity.
Explanation:
Match the behavior of light on different types of matter. The task is to match the lettered items with the correct numbered items. Appearing below is a list of lettered items. Following that is a list of numbered items. Each numbered item is followed by a drop-down. Select the letter in the drop down that best matches the numbered item with the lettered alternatives. a. Allows light to pass through and scatters it as it passes through. b. Does not let light pass through. c. Allows light to pass right through without being scattered. 1. Solid c 2. Liquid a 3. Gas
Answer:
A beam of light (implicitly a plane wave) in vacuum or in an isotropic medium propagates in the particular fixed direction specified by its Poynting vector until it encounters the interface with a different medium. The light causes the charges (electrons, atoms, or molecules) in the medium to oscillate and thus emit additional light waves that can travel in any direction (over the sphere of 4π steradians of solid angle). The oscillating particles vibrate at the frequency of the incident light and re-emit energy as light of that frequency (this is the mechanism of light “scattering”). If the emitited light is “out of phase” with the incident light (phase difference ∼= ±π radians), then the two waves interfere destructively and the original beam is attenuated. If the attenuation is nearly complete, the incident light is said to be “absorbed.” Scattered light may interfere constructively with the incident light in certain directions, forming beams that have been reflected and/or transmitted. The constructive interference of the transmitted beam occurs at the angle that satisfies Snell’s law; while that after reflection occurs for θreflected = θincident. The mathematics are based on Maxwell’s equations for the three waves and the continuity conditions that must be satisfied at the boundary. The equations for these three electromagnetic waves are not difficult to derive, though the process is somewhat tedious. The equations determine the properties of light on either side of the interface and lead to the phenomena of:
1. Equal angles of incidence and reflection;
2. Snell’s Law that relates the incident and refracted wave;
3. Relative intensities of the three waves;
4. Relative phases of the three light waves; and
5. States of polarization of the three waves.
Explanation:
Be specific and shorten it in ur own words I’ll brainlist and rate u 5 star! :)
What are the 2 major steps involved in the breakdown of glucose to carbon dioxide; cellular respiration? Explain what happens in each step.
Glycolysis, the splitting of glucose into two 3-carbon molecules.
The citric acid or Krebs cycle, which produces CO2, NADH, FADH2, and ATP.
Which pair of elements has atoms with the same number of valence electrons ?
a. indium (In) and lead (Pb)
b. potassium (K) and bromine (Br)
c. silicon (Si) and germanium (Ge)
d. astatine At) and radon (Rn)
Answer:silicon (Si) and geranium (Ge)
Explanation:
Silicon and germanium have the same valency. So the correct option is C.
What is valency?
Valence is also referred valency, in the field of chemistry is defined as the property of an element which will determine how many other atoms can this atom combine with
This term was introduced in the year 1868. It is mainly used to present the combination ability of an element in general and also the numerical value of that power of combination.
A major challenge for the chemists of the 19th century was the explanation and the systematization of valency.
When there was an absence of a determination of its cause, the efforts started to centre on the development of empirical rules for determining the numerical values of valences.
The number of atoms of hydrogen with which an atom of the atom can combine or can replace a compound is defined as the characteristic valences for the elements.
Therefore the correct option is C.
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What is the solution to pollution?
A 147g piece of metal has a density of 7.00g/mL. A 50mL graduated cylinder contains 20.0mL of water. What is the final volume after the metal is added to the graduated cylinder
Answer: 41.0 ml
Explanation: (147g/7.00g/ml) = 21.0 ml for the metal
Add to 20.0ml to reach 41.0 ml to 3 sig figs
The ability to conduct an electric current, dissolve in water (solubility) , and melt are _______________.
Group of answer choices
chemical bonding
physical properties
physical changes
chemical properties
Answer:
chemical bonding
Explanation:
i hope this helped :)
How is the mass number of an atom calculated?
Answer: Protons plus neutrons
Explanation: Atomic mass of an element is the sum of protons and neitrons. They are 1 amu (atomic mass unit) each. Electrons are negligible mass and are left out of the calculation.
The mass number of an atom is calculated by adding proton plus neutrons , therefore option (b) is correct.
What do you mean by the mass number of the atom?
An atom’s mass number, also called atomic mass number is the total number of protons and neutrons present in an atomic nucleus.
Protons and neutrons are collectively known as nucleons.
An electron is almost negligible in weight. Thus, the atomic mass of an atom is almost the same as its mass number.
The total number of protons and neutrons present in one atom of an element is known as its mass number.
Mass number = Number of protons + Number of neutrons
The mass number of an atom is calculated by adding proton plus neutrons , hence option (b) is correct.
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In a synthesis reaction, two atoms of sodium (Na) combine with one molecule of chlorine gas (Cl2) to produce sodium chloride (NaCl). How many molecules of sodium chloride are produced?(1 point)
four
two
one
three
Answer: 2
Explanation: I DID DA TEST
A synthesis reaction is a chemical reaction in which two different atoms interact together to produce a different molecule or compound.
Sodium is an alkali metal with the atomic number 11. It has a +1 valence electron in its outermost shell.
Chlorine is a halogen family element with the atomic element 17. It requires an electron to complete its octet structure.
That is why the bonding reaction between them is called Electrovalent or Ionic bonding.
When 2 moles of Sodium (Na) combines with 1 mole of Chlorine (Cl), we have:
[tex]\mathbf{2 Na_{(s)} + Cl_2_{(g)} \ \to \ 2NaCl_{(s)} }[/tex]
Therefore, from the above reaction, we can conclude that there are two molecules of sodium produced when two atoms of sodium (Na) combine with one molecule of chlorine gas (Cl2).
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Match the event with the type of change.
a. Making ice cubes from water
b. Making hot water for tea
c. Using dry ice to create a foggy punch bowl
а
<
1. Changes Between Liquids and Solids
2. Changes Between Liquids and Gases
3. Changes Between Solids and Gases
a
<
av
Answer:
A-1,
B-2,
C-3 is the answer of this queation
Help meeeee please lol
Answer:A bobcats
Explanation:
Answer:
option A bobcats is correct because fox and bobcats both use to eat small mammals , and that make them to compete
Which of the following is an example of a pure substance? *
1 point
Iron shavings
Trail mix
Sodium Chloride mixed with sand
Solution of hydrochloric acid and water
Answer:
Iron shavings
Explanation:
A substance that has a fixed chemical composition throughout and a mixture is when two or more substances are combined, but they are not combined chemically.
Which substance is a mixture?
table salt
gasoline
aluminum
carbon dioxide
Answer:
Answer is Gasoline
Gasoline is a fuel made from crude oil and other petroleum liquids. Gasoline is mainly used as an engine fuel in vehicles. Petroleum refineries and blending facilities produce motor gasoline for sale at retail gasoline fueling stations.
Hope my answer will help you !!
[tex] \large{ \star{ \: \underline{ \tt{QUESTIONS : }}}} \: [/tex]
- Ammonia turns red litmus into blue. What does it show ?
- How can you prepare ammonium sulphate from ammonia ?
- What type of litmus can help to confirm that a gas jar is filled with ammonia ?
- What is meant by liquor ammonia ?
- Plagiarised / random answers will be reported* !! Arigato in advance! :)
Answer:
I've short trick for you to remember litmus
BRA = Blue to Red ➜ Acid
RBB = Red to Blue ➜ Base
0 to 7 ➜ Acidic
7 ➜ Neutral
7 to 14 ➜ Basic
Ans 1:
Ammonia turns red litmus into blue it shows that the process is BasicThe pH of Ammonia is 11.6Ans 2:
Ammonium sulfate can be made in the lab using dilute ammonia solution and dilute sulfuric acidAmmonia + Sulfuric acid → Ammonium sulfate.2NH₃+ H₂SO₄ → (NH₄)₂SO₄Ans 3:
A moist red litmus paper when inserted in the jar containing ammonia gas turns into blue.Ans 4:
A concentrated solution of ammonia, ammonium compounds, and sulfur compounds, obtained as a by-product in the destructive distillation of bituminous coal.-TheUnknownScientist
Que significa HI en educación ambiental
Answer:
Um... Hello in environmental education. i think that what u said :)
Explanation:
HELP PLEASE !!!!!!!!!
Answer:
Explanation:
Let's start b writing down coordinates of all points:
A(0,0,0)
B(0,5,0)
C(3,5,0)
D(3,0,0)
E(3,0,4)
F(0,0,4)
G(0,5,4)
H(3,5,4)
a.) When we reflect over xz plane x and z coordinates stay same, y coordinate changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.
A(0,0,0)
Reflecting
A(0,0,0)
B(0,5,0)
Reflecting
B(0,-5,0)
C(3,5,0)
Reflecting
C(3,-5,0)
D(3,0,0)
Reflecting
D(3,0,0)
b.)
A(0,0,0)
Moving
A(-2,-3,1)
B(0,-5,0)
Moving
B(-2,-8,1)
C(3,-5,0)
Moving
C(1,-8,1)
D(3,0,0)
Moving
D(1,-3,1)
Hi, I need help please :)
A girl pushes a toy boat to the right with a 15 N force. A boy pushes the same boat to the left with a 20 N force. what is the net force? what will happen?
Answer:
the net force is 5. I believe the boat with move to the left due to the increase amount of force the boy is using to push the boat.
What is the number of nitrogen molecules in 6.0 moles of N2?
Explanation:
just take the given moles and multiply it with the ratio of molecules to moles to get your answer
The number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴
How to calculate number of moleculesAvogadro's number( 6.02 × 10²³) is equal to the number of molecules in 1 mole of substance.
That is,
1 mole of N2 = 6.02 × 10²³
6 moles of N2 = 6 × 6.02 × 10²³
= 36.12 × 10²³
= 3.6 × 10²⁴
Therefore, the number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴
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Which fuels would you take on a camping trip? Explain your choices.
Answer:
biofuel as it have many benefits and are emitted with greater advantages
which one has minimum number of atom?
(a) 8g O2 gas
( b) 1g H gas
(c)7 g nitrogen gas
(d) 1.5 g helium gas
Answer: 1 g H2 gas
Explanation:
8g O2 = 0.25 moles
1g H2 = 0.50 moles [I assume you mean H2, not H. If it is H, then moles = 1.0 moles H
7g N2 = 0.25 moles
1.5 g He = 0.43 moles
===============
The moles above are based on molecules. All but He are multiplied by 2 to give the number of atoms. If H2 is correct, it has the greatest number of atoms. (Not if it is just H).
What volume of silver will
have a mass of 2500 g if the
density of silver is 10.5 g/cm3?
ANSWER
= 238.09cm³
IF THE ANSWER IS RIGHT PLEASE MARK AS BRAINLIEST
Given that 1 mile = 160934 cm, calculate the height of a stack of one mole of
pennies in miles. (Hint: begin the conversion with 1 mole of pennies.) Show your work.
The distance to the nearest star, Alpha Centauri, is 2.6 x 10^13 miles.
Answer: 1 mole of stacked pennies would reach a height of 5.69x10^17 miles.
Explanation: The U.S. penny has a thinkness of 1.52mm. One mole of pennies would have:
(1 mole pennies)(6.02x10^23 pennies/mole)*(1.52mm/penny) = 9.15x10^23 mm for 1 mole of pennies. One mile = 1.609x10^6 mm.
(9.15x10^23 mm)/( 1.609x10^6 mm/mile) = 5.69x10^17 miles for 1 mole of pennies.
That would reach Alpha Centauri (5.69x10^17 miles/2.6 x 10^13 miles)= 2.19x10^4 times.
There is a coin shortage in the US, so good luck. Send me your spare pennies.
[Note: I did this quickly, so please check the work. A mole is indeed a big number, but . . .]
What can a bee sting treated with?
Answer:
Treatment depends on severity
For mild to moderate reactions, treatment involves removing the stinger, washing the area with soap and water, and applying cold compresses or ice. Creams to the affected area can help reduce discomfort. Severe reactions may need adrenaline.
Special structures in the cells of plants capture sunlight energy to power photosynthesis. What materials must plants obtain from their environment to perform photosynthesis?
sunlight, carbon dioxide, and simple sugars
sunlight, water, and carbon dioxide
sunlight, oxygen, and carbon dioxide
sunlight, water, and oxygen
Answer:
Sunlight
Water
And carbon dioxide
Additional information :
6CO2 + 6H2O → C6H12O6 + 6O2
Which best describes this compound
Answer:
There is nothing to see
Explanation:
You didnt add the image
When fossil fuel are burned,carbon dioxide and water are produced.what elements must be contained in fossil fuels
To solve such this we must know the concept of combustion reaction. Therefore, the elements must be contained in fossil fuels are carbon, hydrogen and oxygen.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
Combustion reaction is a reaction in which a substance, basically hydrocarbons burns in presence of oxygen to produce carbon dioxide and water. When fossil fuel are burned, carbon dioxide and water are produced. The elements must be contained in fossil fuels are carbon, hydrogen and oxygen.
Therefore, the elements must be contained in fossil fuels are carbon, hydrogen and oxygen.
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Which organ of the respiratory system is located inside the lungs?(1 point)
nasopharynx
trachea
larynx
bronchial tube
bronchial tube is organ of the respiratory system is located inside the lungs
What is respiratory system?The process in which the living cells of an organism obtains energy by taking in oxygen and release carbon dioxide as waste product called as respiration.
In human, the air can be ventilated into the alveoli of the lung and pulmonary gas exchange occur from the alveoli into the pulmonary capillaries.
Gas transport from the pulmonary capillaries through the circulation to the peripheral capillaries in the organs.
Secondly the breathing where the air inhaled through the nose passes to pharynx, larynx, trachea and into the lungs. The air is exhaled back through the same way.
The exchange of Gases occur between Lungs and Bloodstream, means the inhaled oxygen enter into pulmonary capillaries and bind with hemoglobin and is pumped through the bloodstream.
The carbon dioxide from the blood enters into the alveoli and is expelled out by the process of exhalation.
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