melting is considered a(n) ___ change because energy is gained by the substance as it changes state
A. Physical.
B. Chemical.
C. Volume.
D. Dynamic.
agree or disagree that a scientific theory can be modified provide evidence along!!!!!!!
Answer:
I agree.
Explanation:
plssss help for a and b and if possible pls give an explanation but you don’t have to!
Answer:
0 net force it is balanced
Explanation:
If the amount of force is the same on both sides the net force equals 0
True or False: Neutrons have both a positive and negative charge
Answer:
false
Explanation:
Answer:
false
Explanation:
GIVING BRAINLYY
Tracy is looking at the section of the periodic table shown below. Based on the positions of sodium (Na) and potassium (K) in the table, Tracy can predict that sodium what?
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____________________________________PERIODIC TABLE:The periodic table, arranges the chemical elements ascording to their recurring properties. The number of each element corresponds to the number of protons in its nucleus.
-------------------------------------------------------------------------------------------Groups and PeriodsThere are 8 groups and 7 periods in the periodic table.
_________________________________________________________
Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell. The outermost shell of every element in a specific group has same number of valence shell (most chemical properties are determined by the the outermost valence shell electron). The group number of an element represents the number of electrons in its outermost orbit. This shows that elements arranged in the same group have the same number of electrons in their outermost orbit.
_____________________________________Sodium and PotassiumSodium and Potassium belong to the same group i.e. GROUP 1 which is also called S BLOCK Group or IONIC GROUP. They have the similar properties,
__________________________________________________________
Properties of S block Elements
1- They are soft metals
2- possess low melting and boiling points
3- They have the largest atomic radii in their corresponding periods
4- are good conductors of heat and electricity.
5- They have low values of ionization energies and are hence highly electropositive.
_____________________________________Best Regards,'Borz'please help me anyone its due today thank you !
true
Explanation:
Ecothermic reactiions are reactions or processes that release energy. From heat or light.
A.True
Explanation:
Reactants+Products+Energy
Write the number of atoms and name of each element in each chemical formula. Use the periodic table
in Canvas for assistance or you may Google Periodic Table.
(Example: CuNO3 - Copper + 3 oxygen
Hi can someone please help me ? I’ll give you brainlest I just started 6th grade I really need help
Explanation:
Sugar=12 carbon+22 Hydrogen+11 oxygen
marble =Calcium+Carbon×3 oxygen
Natural gas=Nitrogen +4 Hydrogen
Rubbing Alcohol=3 carbon +8 Hydrogen+Oxygen
Glass=Silicon +2 oxygen
Answer:
12 Carbon + 22 Hydrogen + 11 Oxygen
Calcium + Carbon + 3 Oxygen
Carbon + 4 Hydrogen
3 Carbon + 8 Hydrogen + Oxygen
SIlicon + 2 Oxygen
Explanation:
Can I have brainliest? TYSMMMMMMMMMMMMMMMMm
Which organic molecule is not considered a polymer? *
1 point
O nucleic acids
carbohydrates
O lipids
O proteins
Answer:
Lipids
Explanation: Lipids are, in fact, the only non-polymer organic molecules.
Which structure is a valid representation of a hydrocarbon molecule?
Im pretty sure it is the first one
Tonya had a mixture of sand, salt, iron particles, and pebbles. What processes should be used to separate the substances in the mixture from each other?
Explanation:
Put the pan into a water-containing dish and mix well. Now use a strainer to transfer the solution into another jar. The salt should disappear in it.
And using a tube with a filtrate, transfer the salts that has sand into another bottle with a filtrate. Therefore the sand is split. Eventually, when all the water vaporizes and the salt stays in the bottle, leave the extra solvent and heat it.
A gas has a pressure of 65.0 mmHg at 740K. What will be the pressure at 300K if the
volume does not change?
Answer:
26.35 mmHg
Explanation:
Given data:
Initial pressure = 65.0 mmHg
Initial temperature = 740 K
Final temperature = 300 K
Final pressure = ?
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
65 mmHg / 740 K = P₂/300 K
P₂ = 65 mmHg× 300 K / 740 K
P₂ = 19500 mmHg. K /740 K
P₂ = 26.35 mmHg
A 2.9 kg model rocket accelerates at 15.3 m/s2 with a force of 44 N. Before launch, the model rocket was not moving. After the solid rocket engine ignited, hot gases were pushed out from the rocket engine nozzle and propelled the rocket toward the sky.
Which of Newton’s laws apply in this example? Check all that apply.
Answer:
newton's firts law
Explanation:
because it states that everybody continue its state in rest unless an external force is appy to change its state from rest to motion.
Answer:
A, B, C
Explanation:
Which term means finding ways to describe and explain the natural world
through observations and experiments?
A. Pseudoscience
B. Philosophy
C. Chemistry
D. Science
Answer:
D. Science i think
Explanation:
How much water (H2O ) would form if 4.04 g of hydrogen (H2) reacted with 31.98 g of oxygen (O2 )?
(2H2 + O2 2H2O)
Answer:
Mass = 36 g
Explanation:
Given data:
Mass of water formed = ?
Mass of hydrogen = 4.04 g
Mass of oxygen = 31.98 g
Solution:
Chemical equation:
2H₂ + O₂ → 2H₂O
Number of moles of hydrogen:
Number of moles = mass/molar mass
Number of moles = 4.04 g/ 2 g/mol
Number of moles = 2.02 mol
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 31.98 g/ 32 g/mol
Number of moles = 1.0 mol
Now we will compare the moles of water with hydrogen and oxygen.
O₂ : H₂O
1 : 2
H₂ : H₂O
2 : 2
2.02 : 2.02
Number of moles of water formed by oxygen are less thus oxygen will limiting reactant.
Mass of water:
Mass = number of moles × molar mass
Mass = 2 mol × 18 g/mol
Mass = 36 g
Please help!!! I can’t figure it out!
Answer:
The third answer
Explanation:
what is the conclusion of Rutherford atomic model?
Describe the ammonium ion, NH4+, and the sulfate ion, SO42-. What compounds would these ions form with potassium and fluoride ions? Write the formula units for the resulting compounds.
Explanation:
Ammonium Fluoride and Potassium Sulphate
question is
P2O5 a ionic or covalent bond, its covalent right?
Answer:
Covalent
Explanation:
A general clue that a compound is covalent is two nonmetallic elements bonded together. There is the sharing of electrons but no transfer or formation of ions like there is in ionic bonding.
Most plastics are made from oil or natural gas. One step in making plastics from these resources is called cracking. Cracking is a process that breaks down bigger molecules into smaller ones. In one cracking reaction, ethane breaks down to become ethylene and hydrogen. During this process, thermal energy is absorbed from the surroundings and converted to chemical energy.
True or False
Answer:
true im pretty sure
Explanation:
Describe a method to calculate the average atomic mass of using only the atomic masses of
lithium-6=6.01512amu
and lithium-7= 7.01600amu
Answer:
Average amu is 6.52556
Explanation:
Average the numbers
Add the two masses together.
6.01512+ 7.01600= 13.03112
Then divide by 2, we divide by 2 because that is how many #'s we are given.
13.03112/ 2= 6.52556
What is the energy of the photons of a laser with a frequency of 5.75 x 10^12 Hz? (Hint: Remember to round your answer to the lowest number of significant figures.)
Planck's Constant =6.626 X 10^-34
Energy of a photon = Plancks constant x Frequency
Answer:
E = 3.81×10 ⁻²¹ J
Explanation:
Given data:
Frequency of photon = 5.75 ×10¹² Hz
Plancks constant = 6.626 ×10⁻³⁴ Js
Energy of photon = ?
Solution:
E = h×f
E = 6.626 ×10⁻³⁴ Js × 5.75 ×10¹² s⁻¹
E = 38.1×10 ⁻²² J
E = 3.81×10 ⁻²¹ J
You are at a carnival fun house standing 3m in front of a lens with a focal length of 2.5m. What would happen to your image if the lens was concave? What would the image look like if the lens was convex?
molecules are always moving no matter what phase they are in solid liquid gas
true or false
Answer:
Solids - vibrational (and rotational); moving very slowly.
Liquids - vibrational, rotational, and translational; moving quickly.
Gases - vibrational, rotational, and translational; moving very quickly.
Explanation:
Particles are always moving. No matter what. There is a certain point where they move so slowly it is considered minuscule, but they are in fact moving.
Thus, in solids, liquids, and gases, you can expect particles to move in a certain trend. That trend is average kinetic energy of the particles and the forces holding them together (attraction).
How many moles of
C
O
2
COX
2
will be produced from
97.0
g
97.0 g97, point, 0, start text, space, g, end text of
C
3
H
8
CX
3
HX
8
, assuming
O
2
OX
2
is available in excess?
Answer:
Im highy
Explanation:
Which event most likely occurs at point V?
cooling
erosion
heating
melting
I will mark Brainlyest and 20 points
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Actually Welcome to the Concept of the Geography.
Answer is 1.) Cooling.
On cooling of magma, we get the hardened igneous rocks in the nature.
Answer:
Cooling
Explanation:
I did quiz
Which of the choices is an example of an element?
O CO
O Co
O C2H2O2
O CO2
Answer:
Co(cobalt) is the answer
Explanation:
Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.
Describe a powerful force?
Answer:
Gravity is a powerful force.
Explanation:
What mass of NO2 can be produced when 678 mL of oxygen at STP and 256 grams of NH3 are mixed together?
Answer:
WHT55
Explanation:
i experianced this before
why do chemical equations have to be equal
Answer:
Every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. Therefore, there must be the same number of atoms of each element on each side of a chemical equation.
Explanation:
YW :)
The spontaneous disintegration (breaking down) of a nucleus into slightly
lighter and more stable nucleus describes
A.nuclear fusion
B. nuclear fission
C. radioactive decay
D. nuclear radiation
Answer:
Radioactive Decay
Explanation: