Chemistry High School
Answers
Answer 1
Answer:
A piece of wood burns to form ash - Chemical change
Water evaporates into steam - Physical change
A piece of cork is cut in half. __ Physical change
A bicycle chain rusts. _____Chemical change
Food is digested in the stomach. _____Chemical change
Water is absorbed by a paper towel. _____Physical change
Hydrochloric Acid reacts with zinc. _____Chemical change
A piece of an apple rots on the ground. ____Chemical change
A tire is inflated with air - Physical change
A Plant turns sunlight, CO2, and water into sugar and oxygen. _Chemical change
Sugar dissolves in water - Physical change
Eggs turn into an omelet. _____Chemical change
Milk sours. Chemical change
A popsicle melts. _____Physical change
Turning brownie mix into brownies. Chemical change
Explanation:
Matter undergoes two types of changes: physical changes and chemical changes.
A physical change is one that affects only the physical properties of a substance such as colour, size, shape, etc., and in which no new substances are formed. Physical changes are easily reversible.
Chemical changes are changes which affect the chemical characteristics and properties of a substance such as reactivity, acidity, basicity, etc., resulting in the formation of new substances.
The following changes below are categorized as either physical or chemical changes based on which of the properties of the substance is affected and whether new substances result or not.
A piece of wood burns to form ash - Chemical change
Water evaporates into steam - Physical change
A piece of cork is cut in half. __ Physical change
A bicycle chain rusts. _____Chemical change
Food is digested in the stomach. _____Chemical change
Water is absorbed by a paper towel. _____Physical change
Hydrochloric Acid reacts with zinc. _____Chemical change
A piece of an apple rots on the ground. ____Chemical change
A tire is inflated with air - Physical change
A Plant turns sunlight, CO2, and water into sugar and oxygen. _Chemical change
Sugar dissolves in water - Physical change
Eggs turn into an omelet. _ Chemical change
Milk sours - Chemical change
A popsicle melts. _____Physical change
Turning brownie mix into brownies - Chemical change
Related Questions
HELP POGGERS!!! I NEED HELP!!!!!!!!!! THIS IS NEEDED IN 10 MINS
Answers
The answer is 3 - convection.
Answer:
(3)
Explanation:
Guaranteed. Look at my comment for linked picture explanation!
which statement is an example of diffusion
Answer
(A) A kitchen towel soaks up some split milk
(B) ice cream melts in a warm room
(C) pollen from flowers is blown by the wind
(D) the smell of cooking spreads through a house
Answers
D is the answer I think
Answer:
(C) pollen from flowers is blown by the wind.
I think this is the correct answer friend
If you react 156.0 g of calcium chloride with an excess NaOH, how much sodium chloride should you get?
Answers
Answer:
164.3g of NaCl
Explanation:
Based on the chemical equation:
CaCl2 + 2NaOH → 2NaCl + Ca(OH)2
where 1 mole of CaCl2 reacts with 2 moles of NaOH
To solve this question we must convert the mass of CaCl2 to moles. Using the chemical equation we can find the moles of NaCl and its mass:
Moles CaCl2 -Molar mass: 110.98g/mol-
156.0g CaCl₂ * (1mol / 110.98g) = 1.4057 moles CaCl2
Moles NaCl:
1.4057 moles CaCl2 * (2mol NaCl / 1mol CaCl2) = 2.811 moles NaCl
Mass NaCl -Molar mass: 58.44g/mol-
2.811 moles NaCl * (58.44g / mol) = 164.3g of NaCl
one third of the united states carbon consumption is used to operate what
Answers
Answer:
The carbon returns to the atmosphere as carbon dioxide. Cars, factories, and power plants rely on these fossil fuels to operate. In the year 2000, vehicles were the source of one-third of all carbon dioxide emitted in the United States.
Explanation:
1 An
atom
has 20
number?
with 39
neutron
mass number
it's
atomic
Answers
yes it is atomic if the mass number is that high
Can someone please check my answer?
Answers
Explanation:
yes that's correct
Yes i guess It is correct .
1. How many times more acidic is Lemon Juice than apples?
Answers
Lemon juice has a pH of around 2.0 while the pH of an apple is about 3.0 so it’s a 1.0 difference
What is corrosion and how to avoid the process of corrosion?
Answers
Answer:
Three things are necessary for corrosion to occur: an electrolyte, an exposed metal surface, and an electron acceptor. Corrosion can be prevented by removing one of these conditions. Coating a metal surface with paint or enamel provides a barrier between the metal and the moisture in the environment.
I need help with this ASAP PLEASE
Answers
439.3 g CO2
Explanation:
First find the # of moles of CO2 that results from the combustion of 3.327 mol C3H6:
3.227 mol C3H6 × (6 mol CO2/2 mol C3H6)
= 9.981 mol CO2
Use the molar mass of CO2 to determine the # of grams of CO2:
9.981 mol CO2 x (44.01 g CO2/1 mol CO2)
= 439.3 g CO2
is the following chemical equation balanced? Please make a claim, provide evidence, and then explain
your reasoning
2Li + 2H2O → H2 + 2LIOH
Answers
The chemical equation is because why am I saying this based on my observation the right hand side of the equation is equal to the left hand side (the product is equal to the by-product)
Five hundred feet is the same as how many meters?
Answers
In 500 ft there are 152.4 m
So rounded would be 152 m
If helped mark me the brainiest!!
Pick the MAIN output form of energy.
A snail eating a carrot so the snail has energy to move.
Electrical Kinetic Energy
Motion Kinetic Energy
Chemical Potential Energy
Thermal Kinetic Energy
Motion Potential Energy
Nuclear Potential Energy
Answers
Answer:
Chemical Potential Ener
How many non-bonding electrons are present in PO43- ? Group of answer choices
Answers
In the Lewis structure of PO43- there are a total of 32 valence electrons. For the Lewis structure for PO4 3- you should take formal charges into account to find the best Lewis structure for the molecule. Remember, PO4 3- has a negative three charge on the molecule.
How many elements in a periodic table?
Answers
There are 118 elements in the periodic table.
What reacts with the hydrocarbon fuel in a combustion reaction? small words, please
Answers
Hydrocarbon combustion refers to the chemical reaction where a hydrocarbon reacts with oxygen to create carbon dioxide, water, and heat.
#small words#
Plss Guyss I need ur helpp ?? Ill give u brainilist and 35 points ...
A chemical reaction is taking place between two reactants dissolved in a liter of water. If an additional liter of pure water is added to the reaction mixture, what will be the effect on the reaction rate? Explain
Answers
Answer:
The chemical reaction rate will have a effect that which two reactants disolve in liter so if pure water is added it will still have the same reaction but lighter
Explanation:
#keep on learning
A 187.4g sample of C3H5(NO3)3 decomposes to produce carbon dioxide, water, diatomic oxygen, and diatomic nitrogen.
1) Write the balanced chemical equation for the decomposition reaction.
2) How many grams of carbon dioxide are produced?
3) How many grams of water are produced?
4) How many grams of diatomic oxygen are produced?
5) How many grams of diatomic nitrogen are produced?
6) The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. Verify the law of conservation of mass for the decomposition of the 187.4 g of C3H5(NO3)3 .
Answers
Answer:
Answer:
Kc = 0.20
Explanation:
N₂O₄ ⇄ 2NO₂
moles 5.3mol 2.3mol
Vol 5L 5L
Molarity 5.3/5M 2.3/5M
= 1.06M = 0.46M
Kc = [NO₂]²/[N₂O₄] = (0.46)²/(1.06) = 0.1996 ≅ 0.20
Note:
All credit goes to drpelezo (Ace) who created and explained the answer.
Have a nice day, and I hope this helps
-kiniwih426
Most of the electricity that is used in everyday life comes from________ current.
Fill in the blank
Answers
Answer:
electric is your answer :)
Explanation:
Edge STEM instruction/assignment perhaps???
Answer:
A. C (alternate current)
Is all the biomass consumed by a primary consumer, such as a brine shrimp, transferred to the secondary consumer, such as a gull, when the brine shrimp is eaten? For instance, if a brine shrimp eats 10 g of algae in its life before the gull eats it, does the gull get 10 g of biomass when it eats the brine shrimp? Why or why not?
Answers
Okkkkkkjjjjkdnhehdydyegevevevbenrjrjrjduueuegeveveve
Tipo de enlace en los compuestos. Compuesto /Electronegatividad Elemento 1/Electronegatividad Elemento 2/ Diferencia de electronegatividad (resta) Tipo de enlace CO2 KCl H2O
Answers
Answer:
Tipo de enlace enlace en CO2 - Covalente
Tipo de enlace enlace en KCl - iónico
Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno
Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1
Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4
Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4
Explanation:
Tipo de enlace enlace en CO2 - Covalente
Tipo de enlace enlace en KCl - iónico
Tipo de enlace enlace en H2O: enlaces covalentes y de hidrógeno
Electronegatividad de CO2 - Diferencia en electronegatividad de carbono (EN = 2.5) y oxígeno (EN = 3.5) = 3.5 - 2.5 = 1
Diferencia en electronegatividad de KCl = 3,2 -0,8 = 2,4
Diferencia en electronegatividad de H2O = 3.5 -2.1 = 1.4
is A tomato smells rotten a chemical
reaction
Answers
Answer:
yup
Explanation:
because chemical change took place
the reaction cant be reversible
That’s crazy I didn’t know that
A rigid container of O2 has a pressure of 2551 mmHg at a temperature of 713 K. What is the pressure at 273 K?
Answers
Answer:977.34
Explanation:
divide 2551 and 273 to get 3.778. then multiply 3.78 by 273 to gry 977.34.
What is the mass of a sample of NH3 containing 3.80 x 1024 molecules of NH3? (5 points)
74.8 grams
107 grams
89.4 grams
101 grams
Answers
Answer: 107 grams
Explanation: got it right on the test
The mass of a sample of f NH₃ containing 3.80 x 10²⁴ molecules of NH₃ is 107.27 grams.
What is a molecule?
A molecule is a group of two or more atoms that form the smallest identifiable unit into which a pure substance can be divided and still retain the composition and chemical properties of that substance.
6.02214076 × 10²³ molecules constitute 1 mole of NH₃
3.80 x 10²⁴ molecules constitutes of = 6.31 moles
1 mole of NH₃ = 17 gm
11.19 mole will be = 17 X 6.31
= 107.27 grams
Therefore the mass of a sample of NH₃ containing 3.80 x 10²⁴ molecules of NH₃ is 107.27 grams.
Learn more about molecules here:
brainly.com/question/19922822
#SPJ2
Why study science?
Lmk ASAP
Answers
We study since to have a better understanding of our world. We have so many questions. Understanding science can lead us to new inventions, advancement in technology, new medicine and medical treatments, and understanding our planet better.
write the chemical formula of 25 compound
Answers
C2h40
No cap that’s it
You are given a clear-water solution containing potassium nitrate. How could you determine whether the solution is unsaturated, saturated, or supersaturated?
Answers
Answer:
If it is unsaturated, we can dissolve some more amounts of potassium nitrate into it Explanation:
Balance the following equation by providing the correct coefficients C2H6 + O2 -> CO2 + H2O
Answers
2 C2H6 + 7 O2 ➡️ 4 CO2 + 6 H2O
What is the volume of NaOH used in each Titration??
Answers
Answer:
Titration 1=33.9ml
Titration 2=33.45ml
Titration 3=33.35ml
Explanation:
Volume of NaOH used =Final reading - Initial reading
Titration 1:
Final reading =35.5ml
Initial reading=0.6ml
Volume of NaOH used =34.5ml -0.6ml=33.9ml
Titration 2:
Final reading =34.3ml
Initial reading=0.85ml
Volume of NaOH used =34.3ml -0.85ml=33.45ml
Titration 3:
Final reading =33.8ml
Initial reading=0.45ml
Volume of NaOH used =33.8ml 0.45ml=33.35ml
Hope it helps:)
Liquid A has weaker intermolecular forces than liquid B. Which liquid would demonstrate greater surface tension?
Answers
Answer:
ronger intermolecular forces will produce greater surface tension .
The intermolecular forces present in a sample of water are hydrogen bonds . The high surface tension of water allows a paper clip to "float" on the surface of the water. It's not actually floating, it's resting on top of the hydrogen bonds that exist between the water molecules at the surface. See the video below which shows a paper clip resting on the surface of water in a beaker.
If the hydrogen bonds are removed or disrupted, the surface tension will decrease. Watch what happens to the paper clip in the video when detergent (which will disrupt hydrogen bonds) is added to the beaker.
Here is video showing how a paperclip can "float" on water - it's actually being held up by the hydrogen bonds formed between water molecules which give water its surface tension.
pls mark me the brainliest
Two hundred liters of helium at 2.00 atm and 28.0 °C is placed into a tank with an internal pressure of 5.92 atm. Find the volume of the helium
after it is creleased into the tank when the temperature of the tank.remains 28.0°C.
liters (Round to three sig figs)
Answers
Answer:
27*6 dkfkdh hshsnnsbssshs ss. hhshsns svs s ssjssgsyz
Explanation:
ysgshssbs
