what are 2 of the characteristics of temporary physical change
Answer:
Temporary in nature.
No new substance is formed.
Explanation:
Temporary in nature: Does not affect the internal structure of a substance, only the molecules are rearranged.
No new substance is formed: Most of the physical changes are reversible. We can obtain the substance back even after the change.
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have an awesome day -TJ
Answer:
Doesnot affect the internal structure of the substance.no new substance is formed.temporary in nature...
The colour of outer zone of candle flame is _________.
A. orange
B. blue
C. red
D. yellow
Answer:
Explanation:
At the outer zone of candle flame, there are more oxygen available for the combustion reaction. So the flame is yellow in color.
The answer is D. yellow.
Answer:
B. blue
Explanation:
The candle's flame is divided into three zones: blue on the outside, yellow in the midst, and black on the inside. This is the result of the wax that is formed after the meltdown of the candle.
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fast please 20 points
Answer:
Horse SS and Horse Ss
Explanation:
The horse look the same except for Horse ss
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Identify the gas that is generally produced when coal is burnt in the presence of a lot of air.
A. Carbon monoxide
B. Sulphur dioxide
C. Nitrogen dioxide
D. Carbon dioxide
Answer:
Carbon dioxide
Explanation:
The reaction is given by
C+O_2-->C0_2CO2 is a harmful gas also responsible for the global warming and air pollution
When coal is burnt in the presence of excess air, some of the gases produced include carbon dioxide, oxides of nitrogen, and sulfur dioxide.
What are the gaseous products from coal burning?When coal is burnt in the presence of a lot of air, a variety of gases are produced: These include:
Carbon dioxide which is the major productOxides of nitrogenOxide of sulfurAside from carbon dioxide, other gases depend on the content of coal.
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How much heat energy is needed to change 10 kg of ice at to water at ? , ,
we know that,
W = mL + mcθ
W= 10(336+ 4.2(50))= 5460 kJ
so quantity of heat required is 5460 J
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Convert −55 ◦C to Kelvin
Answer:
-459.67 good luck and hope you pass
A chemist wants to make a solution using a crystalline solid and water. Which action would speed up the solution-making process?
A
Heat the water while adding the crystalline solid.
B
Slowly cool the water while adding the crystalline solid.
C
Divide the water into smaller batches, adding a little of the solid to each.
The action that would speed up the solution making process is : ( A ) Heat the water while adding the crystalline solid
Ways to increase solution making processWhen preparing a solution or trying to dissolve a crystalline solid in water there are three ways which can be used to speed up the solution making process or dissolving the solid faster. and they are
Increase in temperature of water Divide the solid into smaller particles before adding them Increasing the stirring rateFrom the options listed above the best action is to heat the water while adding the crystalline solid.
Hence we can conclude that The action that would speed up the solution making process is : ( A ) Heat the water while adding the crystalline solid.
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Answer: A
Explanation: heat the water
What is qualitative and quantitative?
Answer:
Quantitative data refers to any information that can be quantified, counted or measured, and given a numerical value. Qualitative data is descriptive in nature, expressed in terms of language rather than numerical values
Explanation:
:)
The process that breaks down granite into sediment is deposition
True
false
Which of the following is a pure substance?
O A. Milk
O B. Salt
O C. Blood
O D. Candy bar
Answer:
A. Milk
Explanation:
Cause is basics. It's proved by scientific I watched on TV and my teacher told me. I am a 100% sure.Go ask to your mother how many litres you drink her milk per day.
How is the hfusion used to calculate the energy needed to melt a mass of
solid?
Answer:
You can use fusion to measure the amount of energy required to melt a given amount of a solid at its melting point temperature.
Explanation:
Why is carbon dioxide a necessary part of the atmosphere.
Answer:
helps to trap heat in our atmosphere
Strong bases are ____________ of group ____________ metals (ex. ____________ ) or larger group ____________ metals (ex. ____________ ), or oxides of the same metals.
The strong bases are hydroxides of group 1 and 2 metals (ex. Sodium, Potassium) or larger group transition metals (Copper, Iron), or oxides of the same metals.
Strong bases formulationIt follows from structure of strong bases that they are composed of highly electropositive metals of groups 1 and 2 and the hydroxide ion.
Additionally, transition metals may also form bases with the hydroxide ion or oxides of this transition metals.
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Scientific laws commonly answer which questions about the world?
1. Why?
2. How?
3. How many?
4. What?
Answer:
How
Explanation: In science a person has to be curious on how things work. Key word how. Why makes sense but how is the better answer. How many is a specific question. But it doesn't involve the whole spectrum of science. What also doesn't make sense.
A scientific law is a proposition that states what consistently takes place under specific circumstances. The law of conservation of mass and the law of conservation of energy are two other examples of physical science laws. The correct option is 2.
A scientific law only describes an occurrence in the natural world; it makes no attempt to explain how it happens. It is only the outcome of several observations and is supported by empirical evidence.
The definition of a naturally occurring phenomenon in the world is scientific law. It clarifies how something occurs. Equations or formulas in mathematics are used to express laws.
Thus the correct option is 2.
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We have more solid volatiles than our other giant members.
what planet is this or planets
Answer:
Jupiter
Explanation:
it's big and the ring around it
PLEASE HURRY THIS IS DUE IN 4 MINUTES!!! 3. In the understory, all of the following are true except
A. The understory has a hot, humid environment.
B. Leaves are bigger in the understory than the other layers because not much sunlight reaches this area.
C. Jaguars and leopards live in the understory.
D. Insects, bees, ants, and beetles live in the understory.
Answer:
WHERES THE UNDER STORY! POST IT QUICK AND ILL HELP
Explanation:
(PLEASE ANSWER!)
2H20 + 2Na --> 2NaOH + H2
which of these is a reactant in this chemical reaction?
A. hydrogen
B. nitrogen
C. oxygen
D. water
Answer:
Water (H2O) and Sodium (Na) are reactants.
Explanation:
2H2O+2Na......2NaOH+H2
In the above reaction the water (H2O) and sodium (Na) are reactants and sodium hydroxide (NaOH) and hydrogen are products.
And this is the single displacement reaction.
How many potassium ions are needed to bond with a phosphate ion?.
"Ozone Depletion."
Spray bottles, air conditioners, and
refrigerators used to contain CFCs
and halogens. These chemicals
destroyed ozone and broke apart the
ozone layer. They made two large
holes at the North and South Poles.
However, most of these chemicals
are now not allowed.
What is the MOST accurate summary of this
paragraph?
Answer:
CFCs and halogens coming from spray bottles and other human satisfaction sustaining devices cause global warming, which will cause sea levels to rise. Because of this, several countries have banned these chemicals because of anticipation of a rise of sea levels and several important countries to be sunken.
the states of matter involved in a milkshake
Answer:
it is a liquid that is made from the combination of a liquid and a solid.
Explanation:
When these two states of matter are ground and mixed together, they form one state that is liquid
Answer:
Solid and liquid
Explanation:
Solid= ice cream or ice
Liquid= milk
these are common things used in a milkshake
Complete the mechanism for the reaction of butanone with NaBH4 followed by the addition of aqueous acid. Butanone is a 4 carbon chain where carbon 2 is double bonded to oxygen. This reacts with N a B H 4, followed by H 3 O plus to give the final product. Step 1: draw curved arrows. ⟶ Step 2: Draw the charged organic intermediate product. Include nonbonding electrons and charges. Omit the counterion. −→−−H3O+ Step 3: Draw the final product
The formation of a primary alcohol from a ketone involves the use of a ketone and NaBH4 followed by an acid workup.
Formation of a primary alcoholThe question is unclear but clearly relates to the formation of a primary alcohol. The first step in this reaction is the attack of the NaBH4 on the carbonyl carbon of butanone.
The reaction sequence is completed by an acid work up in which an acidic hydrogen is abstracted by the nucleophile to yield a primary alcohol.
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UHHH HELP I STUCK IN THIS ONE
Answer:
I believe it's B oxygen
Explanation:
Answer:
D, carbon dioxide.
Explanation:
In order to survive, animals need oxygen, food, and shelter.
what is the molarity of a solution in which 65.3 NaNO3, are disssolved in enough water to make 1250 mL of solution?
Answer:
1242
Explanation:
word equation for magnesium carbonate and nitrate (V)acid.
Answer:
This is an acid-base reaction (neutralization): MgCO 3 is a base, HNO 3 is an acid.
Explanation:
HNO3 + MgCO3 → H2O + CO2 + Mg(NO3)2
During which process in the water cycle does water release thermal energy? Explain how you know.
Answer:
evaporation
Explanation:
Evaporation occurs when a liquid changes to a gas. During evaporation, molecules gain enough thermal energy to escape from the liquid surface into the air as water vapor.
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2CuCl2 + 4KI → 2CuI + 4KCl + I2
a. When 0.64 grams of CuCl2 reacts with 0.78 grams of KI, how many grams of I2 are formed?
b. What is the limiting reactant?
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why is solar energy a viable alternative energy resource?
Solar energy is a viable alternative energy resource due to its high usage application.
Why is solar energy a viable alternative energy resource?The solar energy is considered as a viable alternative energy resource because this energy can used in the form of electricity for operating all electrical devices present in our homes.
So we can conclude that solar energy is a viable alternative energy resource due to its high usage application.
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Answer:
It has an endless supply is the answer.
Two compounds might have spots with the same rf value in a chromatography experiment and not be identical compounds. Which proposed chromatography experiment could best help determine whether the compounds are identical?.
The repeat of the original chromatography experiment with a different solvent might could best help determine whether the compounds are identical.
What is chromatography?Chromatography is a technique used in the laboratory to physically separate two different objects and/or materials.
In chromatography, these materials are separated into two phases called the stationary phase and the movement phase.
Chromatography is also used to purify a given substance and thus determine its exact composition.
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1. How many moles are in 15.5 g of SO2
2. Find the mass of 1.50 mol C3H8?
3. How many moles is 1.50 x 1023 molecules of NH3 ?
4. Convert 2.50 x 1025 formula units of NaCl into grams.
5. Convert 3.60 mol CO2 into molecules
1. The number of mole in 15.5 g of SO₂ is 0.242 mole
2. The mass of 1.50 mole of C₃H₈ is 66 g
3. The number of mole of NH₃ that contains 1.5×10²³ molecules is 0.249 moles
4. The mass of NaCl that contains 2.5×10²⁵ formula units is 2429.4 g
5. The number of molecules present in 3.6 moles of CO₂ is 2.167×10²⁴ molecules
1. How to determine the mole of SO₂Mass of SO₂ = 15.5 gMolar mass of SO₂ = 32 + (2×16) = 64 g/mol Mole of SO₂ =?Mole = mass / molar mass
Mole of SO₂ = 15.5 / 64
Mole of SO₂ = 0.242 mole
2. How to determine the mass of C₃H₈Mole of C₃H₈ = 1.5 moleMolar mass of C₃H₈ = 44 g/mol Mass of C₃H₈ =?Mass = mole × molar mass
Mass of C₃H₈ = 1.5 × 44
Mass of C₃H₈ = 66 g
3. How to determine the mole of NH₃From Avogadro's hypothesis,
6.02×10²³ molecules = 1 mole of NH₃
Therefore,
1.5×10²³ molecules = 1.5×10²³ / 6.02×10²³
1.5×10²³ molecules = 0.249 mole of NH₃
4. How to determine the mass of NaCl6.02×10²³ units = 58.5 g of NaCl
Therefore,
2.5×10²⁵ units = (2.5×10²⁵ × 58.5) / 6.02×10²³
2.5×10²⁵ units = 2429.4 g of NaCl
5. How to determine the number of molecules1 mole of CO₂ = 6.02×10²³ molecules
Therefore,
3.6 moles of CO₂ = 3.6 × 6.02×10²³
3.6 moles of CO₂ = 2.167×10²⁴ molecules
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What happens to the sunlight when it reaches the Earth's surface?
O
All of the sunlight is reflected from the Earth's surface and radiated
back into space
O
Some of the sunlight is captured as heat on Earth, and some of it is
radiated back to space.
O
All of the sunlight is absorbed by the Earth's surface
Answer:
the second one
Explanation: