Answer:
Yes, a cooking egg is a chemical change! Water is evaporated from the egg and the egg changes composition. You might say that raw egg and water are the reactants and cooked egg and water vapor are the reactants.
Explanation:
Frying an egg is an example of a chemical change.
What is a chemical change?A chemical change refers to a kind of irreversible change. In this type of change, the element that undergoes a transformation cannot be returned to its original state.
This is the case with an egg which when fried cannot be returned to its original liquid state. So, unlike a physical change tha can be reversed, a chemical change is irreversible.
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PLEASE HELP ME IMPORTANT
"Given a block of frozen salt water, how could you separate
pure water from the salt using only a fire & stove? Please be
as specific as you can by mentioning PHASE CHANGES.
Answer: You could put the frozen block of ice on the stove and let it melt and eventually boil out leaving the salt behind
Explanation:
A combustion reaction occurs between one molecule of methane (CHa) and two molecules of oxygen (O2).
How many atoms of carbon, hydrogen, and oxygen make up the products for this combustion reaction?
O A) 1 carbon, 1 hydrogen, and 1 oxygen
O B) 1 carbon, 1 hydrogen, and 2 oxygen
O C) 1 carbon, 4 hydrogen, and 2 oxygen
OD) 1 carbon, 4 hydrogen, and 4 oxygen
The total number of atoms make up the products :
D) 1 carbon, 4 hydrogen, and 4 oxygen
Further explanationComplete combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O compounds.
If O₂ is insufficient there will be incomplete combustion produced by CO and H and O
Hydrocarbon combustion reactions (especially alkanes)
For combustion of methane (CH₄) and two molecules of oxygen (O₂).
[tex]\tt CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]
The number of atoms make up the products
CO₂ : 1 carbon, 2 oxygen
2H₂O : 4 hydrogen , 2 oxygen
The total number of atoms make up the products :
D) 1 carbon, 4 hydrogen, and 4 oxygen
Combustion Reaction:Combustion is a chemical process in which a substance reacts rapidly with oxygen and gives off heat.
Combustion of Hydrocarbons with Oxygen will produce CO₂ and H₂O compounds.
If O₂ is insufficient there will be incomplete combustion produced by CO and H and OFor combustion of methane (CH₄) and two molecules of oxygen (O₂).The number of atoms make up the products:CO₂ : 1 carbon, 2 oxygen
2H₂O : 4 hydrogen , 2 oxygen
Thus, the correct option is D.
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i neeeed helllllpppppss
Answer:
the answer is 4 g/cm cube
Answer:
4g/cm cube is answer of this question
I hope it helped.
Reason. p=m/v
p=20 g/5cm cube
=4g/cm3
helllllllpppppp pleeeaaassseee
Answer:
The density of ice ice is lesser than that of water that's why ice floats on water. So hence, the answer is C
Answer:
Less than that of water
Explanation:
This explains why icebergs float on water. If it was greater than that of water icebergs would sink.
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Based on the article “Will the real atomic model please stand up?,” why did J.J. Thomson experiment with cathode ray tubes?
A. to specifically identify the nucleus as a separate part of an atom
B. to determine that electric beams in cathode ray tubes were actually made of particles
C. to prove John Dalton and Democritus wrong
D. to determine the exact energy output of cathode ray tubes
Answer:
B. to determine that electric beams in cathode ray tubes were actually made of particles
Explanation:
Answer:
B. to determine that electric beams in cathode ray tubes were actually made of particles
Explanation:
edg 2020
An atomic model shows 19 protons, 20 neutrons, and 19 electrons. What is the mass number of the atom?
A. 39
B. 20
C. 58
D. 19
Answer:
A. 39
Explanation:
Mass number= #protons + #neutrons
19+20= 39
Taking into account the definition of mass number, the correct option is the option A: the atomic mass of the atom is 39.
First of all, all atoms are made up of subatomic particles: protons and neutrons, which are part of their nucleus, and electrons, which revolve around them. Protons are positively charged, neutrons are neutrally charged, and electrons are negatively charged (electrons).
On the other hand, the mass number tells us the total number of particles in the nucleus. That is, the mass number is the sum of the number of protons and the number of neutrons in the atomic nucleus:
Mass number = (number of protons) + (number of neutrons)
It is represented by the letter A.
In this case:
number of protons= 19number of neutrons= 20So:
Mass number = 19 + 20
Solving:
Mass number= 39
In summary, the correct option is the option A: the atomic mass of the atom is 39.
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I BELIVE ITS 5 SORRY IF THATS WRONG BUT IM SURE
In the rock cycle, where is the energy being released?
Group of answer choices
magma
magma to igneous
igneous to sedimentary
sedimentary to metamorphic
There's a picture of the rock cycle just so you know :)
Answer:
the two major sources of energy for the rock cycle are also shown; the sun provides energy for surface processes such as weathering, erosion, and transport, and the Earth's internal heat provides energy for processes like subduction, melting, and metamorphism.
what are two transition metals that start with the letter R
Answer:
Ruthenium and Rhodium
Explanation:
As the atomic number on the Periodic Table increases, the number of electrons A. is unchanged B. alternates C. decreases D. increases
Answer:
D.
Explanation:
I looked it up and said increases, i'm taking a test today in chemistry and had the same question lol.
Help
I think that is C ?
Answer this please need help right now
Objects
1. Plastic Bottle
2. Plastic Bottle
Potential energy : energy obtained due to height or position (the force of gravity)
PE = mhg
g = acceleration due to gravity (m/s²)
h = height (m)
m = mass (kg)
1. Known
m = 0.5 kg
h = 1 m
g = 9.8 m/s²
then :
[tex]\tt PE=0.5\times 1\times 9.8=4.9~J[/tex]
Kinetic energy is the energy gained by an object's motion
KE = 1/2 mv²
2. To find KE, the required data are the mass and velocity
in this table, you do not display the velocity
The type of igneous rock which has a large number of cavities
formed by gases escaping from the molten rock is called
The answer would be scoria I believe
What type of solid contains particles that are jumbled and form no particular
pattern?
A. Crystalline
B. High-pressure
C. High-viscosity
D. Amorphous
Answer: D
Explanation:
Amorphous
Answer:D
Explanation:
took the apec test
This gas is found in the stratosphere where it helps protect us from UV radiation.
A) ozone.
B) oxygen.
C) nitrogen.
D) carbon dioxide.
Answer:
A.Ozone
Explanation:
Which of the following statements is true about neutrons? *
a)They have a neutral charge and are found in an atom's nuclues
b)They have a negative charge and are found in an atom's nucleus
c)They have a positive charge and are found in the orbitals of an atom
d)They have a neutral charge and are found in the orbitals of an atom
Answer:
A
Explanation:
Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.
Grade 8 SCIENCE BASELINE - 2020-2021 Question: 1-39
To bring heavy boxes down a fight of stairs. Tyrone uses a camp. He shoes the boxes down the ramp. The movement transforms ce type d energy into the fons made togos
the way that most of the energy is transformed?
potential energy into chemical energy and mechanical energy
o potential energy into light energy and mechanical energy
o potential energy into sound and chemical energy
O potential energy into heat and kinetic energy
Answer:
This question is unclear, the comprehensive question is:
To bring heavy boxes down a flight of stairs, Tyrone uses a ramp. He slides the boxes down the ramp. The movement transforms one type of energy into two other forms. Which of the following describes the way that most of the energy is transformed:
ANSWER:
Potential energy into heat and kinetic energy
Explanation:
According to this question, a ramp is used to bring heavy boxes down a flight of stairs. Tyrone does this by sliding the boxes down the ramp. The ramp is in a fixed position i.e. not moving, meaning the energy in the ramp is POTENTIAL ENERGY.
However, when the boxes slide down the ramp, the potential energy transforms to energy due to motion called KINETIC ENERGY, and HEAT ENERGY, which is caused by the friction between the boxes and the ramp.
Therefore, the potential energy of the ramp is transformed to kinetic energy in the boxes and heat energy.
The nucleus of an atom consists of:
a. lons & isotopes
b. Electrons & neutrons
c. Protons & neutrons
d. All of the above.
Answer:
the nucleus of an atom consistens of protons and neutrons
Does the number of molecules change when a substance changes state?
Answer:
Molecules do't break up and reform when a substance boils and cools. Particles stay the same size and shape during state changes.
Explanation:
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A driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be ___.
Group of answer choices
unbalanced
small
large
balanced
Answer:
balanced
Explanation:
A driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.
What is Cruise control?Cruise control may be defined as a type of system that significantly controls the speed of a motor vehicle automatically. It maintains the speed of the vehicle constant without the use of the accelerator pedal once you selected a specific speed.
The speed of the vehicle must remain constant during the course of time. This is possible when the force acting on the driver must be in a balanced state. Otherwise, it will be difficult for the driver to sustain the same speed for a long time.
Therefore, a driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.
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Who uses petroleum and for what purpose?
Answer:
today, petroleum is mostly used as a source of energy, being rich in combustible carbon in the production of electricity or running some sorts of heat engines. ... Raw petroleum (also known as crude oil) is used in three major ways: Transportation, Electricity Generation, and Material Production.
Explanation:
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To which family on the Periodic Table does this Bohr Model belong?
Answer:
As the valance shell have 7 valance electrons .
It belongs to halogen family (group 17).
1 teaspoon is Benefiber is added to 1 1/2 cups of water. Which of the following correctly describes what is formed?
O A. The chemical reaction between water and Benefiber allows one substance to dissolve in the other.
B. Water and Benefiber combine to form a precipitate.
o C. Benefiber is the solute in the solution that is formed.
D. Water is the solution in the solvent that is formed.
Explanation:
(A) Manganese salts give a grey borax bead test in reducing flame.
(B) From a mixed precipitate of AgCl and AgI, ammonia solution dissolves only AgCl due to the formation of [Ag(NH
3
)
2
]Cl.
(C) Ferric ions give a prussian blue precipitate on adding potassium ferrocyanide solution (D). On boiling the solution having K
+
, Ca
2+
, and HCO
3
−
ions, we does not get a precipitate of K
2
Ca(CO
3
)
2
Combustion of a hydrocarbon, X, is given by the equation: 2 X + 5 O2 (g) --> 4 CO2 (g) + 6 H2O (g) ∆H = -75.0 kJ Use this information and the standard enthalpies of formation listed in the text or elsewhere, to determine the standard enthalpy of formation of the hydrocarbon, X.
Answer:
Hof(X) = - 1474.9 KJ/mol
Explanation:
The reaction equation given to us is:
2 X + 5 O2 (g) --> 4 CO2 (g) + 6 H2O (g) ∆H = -75.0 kJ
Now, the equation for the standard enthalpy of formation of the reaction is written as follows:
ΔH = 4*Hof(CO2(g)) + 6*Hof(H2O(g)) - 2*Hof(X) - 5*Hof(O2(g))
where,
ΔH = - 75 KJ
Hof(CO2(g)) = Standard Heat of Formation of CO2(g) = -393.5 KJ/mol
Hof(H2O(g)) = Standard Heat of Formation of H2O(g) = -241.8 KJ/mol
Hof(X) = Standard Heat of Formation of X = ?
Hof(O2(g)) = Standard Heat of Formation of O2(g) = 0 KJ/mol
Therefore,
-75 KJ = (4)(-393.5 KJ/mol)+ (6)(-241.8 KJ/mol) - (2)(Hof (X)) - (5)(0 KJ/mol)
- 75 KJ + 3024.8 KJ = - (2)(Hof(X))
Hof(X) = -2949.8 KJ/2 mol
Hof(X) = - 1474.9 KJ/mol
The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate,
Answer:the atoms of a solid aluminium can are close together vibrating in a rigid structure if the can is warmed up on a hot plate
Explanation:
How many atoms are present in 3 moles of chromium?
O 52.0 atoms
O 6.02 x 1023 atoms
O 1.80 x 1023 atoms
O 1.80 x 1024 atoms
Answer:
1.80 x 10^24 atoms
Explanation:
3moles × 6.022×10^23 atoms/mole
“Chemistry is the study of all substances. Chemistry is everywhere” you think this is a good enough answer for a test about “what is chemistry?
Answer:
Try to make it more detailed "Chemistry is the study of all substances" is an amazing start. Can you give some examples of chemistry? Try to make a small paragraph.
Explanation:
Explanation:
Chemistry, the science that deals with the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
This is a more detailed answer...
The three main types of RNA are ____________________, _____________________, and ______________.
Answer:
There are three main types of RNA: messenger RNA, ribosomal RNA, and transfer RNA.
Explanation:
Messenger RNA (mRNA), Ribosomal RNA (rRNA), and Transfer RNA (tRNA).
1. A substance has a mass of 5.55 g and a volume of 3.00 cm”. Determine the density of this
substance and then use Table Sto identify the substance.
I need help please
Answer:
1.85 g per cm^3
The substance is Beryllium(if it is a single element, and not a compound)
Explanation:
