Answer: Uh, thanks.
Explanation:
What is the solution to pollution?
How does a wildfire start?
Answer:
Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike. However, most wildfires are because of human carelessness such as arson, campfires, discarding lit cigarettes, not burning debris properly, playing with matches or fireworks.
Use the word stable to explain why the alkali metals tend to lose 1 valence electron.
Answer:
becoz vvv is always with you
Answer:
Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable
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
2. Choose the best answers
1. A spon used to open the lid of a can is...
(1) first class lever
(ii) second class lever
(ii) thin class lever
(i) none of them.
2. Which simple machine is used to right the screw with screw driver?
(1) Lever (ii) Wheel and Axle (ii) inclined plane (iv) Wedge
3.Which category of the simple machine is autotly Kito
(i) Lever (ii) Wheel and Axle (iii) Pulley (iv Wedged.
4. Which type of the simple machine is the axe!
(1) Lever (2) Screw (3) Wedge (4) Inclined plane
5. Which type of the simple machine is winding road in hilly
(i) Lever (ii) Wedge (iii) Serew (iv) Inclined plane
Answer:
4 ans is 3,5ans is iv i know only this much
can you pls tell me advantages and disadvantages of chemistry in specific
Advantages
Chemistry helps you to understand the world around you.
Basic knowledge of chemistry helps you to read and understand product labels.
Chemistry can help you make informed decisions.
Chemistry is at the heart of cooking.
A command of chemistry can help keep you safe!
Disadvantages
It isn't a sustainable form of energy.
It can be expensive.
Some forms of chemical energy are quite rare.
It can produce harmful waste.
It can be used to create devastating weapons.
It offers short-term benefits for long-term consequences.
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
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
How much silver chloride is precipitated when 25.0 g of calcium chloride and 25.0 g of silver nitrate are mixed together in a beaker of water?
CaCl2 + 2AgNO3 --> Ca(NO3)2 + 2AgCl
Answer:
21.09 g of AgCl
Explanation:
Hopefully the picture is clear and the method is understandable.
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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 !!
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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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:
Someone plz help me :(
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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2.56g of impure copper(ii) sulphate sample was dissolved in water and precipitated with excess copper hydroxide solution. if 1.245g of copper (ii)hydroxide was obtained, what is percentage of copper(ii) sulphate in the impure sample
Since we know that 1.245g of Cu(OH)2 was obtained after the solid precipitated in water, it means that the remaining has to be CuSO4. Thus, we can take the difference between the two masses to get the mass for CuSO4.
After that, divide the mass of CuSO4 by the overall mass of the impure substance, multiply it by 100, and you will get the percentage of purity.
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
[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
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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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).
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.
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 happens to acceleration when mass is increased
Answer:
If you increase the mass at a given force the rate of acceleration slows. Therefore, mass is inversely proportional to acceleration. ... Force is directly proportional to acceleration (force ~ acceleration) As force increases acceleration increases.
acceleration slows down .
Explanation:
if we increase the mass at a given force the rate of acceleration slows
Ductile means...
a. can be drawn into wire.
b. the element is brittle,
c. the element is shiny
Answer:
A
Explanation:
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 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
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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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 :)
Discuss what your community do to deal with poverty
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)
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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