Answer:
a usually reversible change in the physical properties of a substance, as size or shape:
Freezing a liquid is a physical change.
Explanation:
Answer:
Hey!
Explanation:
The definition of physical change can be expressed as.. let's say.. the physical difference in an organism. Physical change affects the form of a chemical substance, but not its chemical composition. Hope this helps! :)
A car moves with a velocity of 15 m/s west for 3 seconds. Then, the
car moves with a velocity of 15 m/s east for 1 second. What is the
total displacement of the car?
Answer:
450 metre
Explanation:
VELOCITY = DISPLACEMENT /TIME TAKEN. THEREFORE THE DISPLACEMENT = 450 M.
Explanation:
Since sodium chloride is classified as a compound, a sample of it contains
A. atoms that are gases, liquids, and solids.
O
B. more than one kind of atom.
C. matter that cannot be reduced to atoms.
O
D. a solution of atoms and molecules.
Answer:
more than one kind of atom. a solution of atoms and molecules.
Explanation:
a compound always contains more than one type of atom.
Although the formula for sodium chloride is NaCl, the compound does not contain actual NaCl molecules. Rather, it contains equal numbers of sodium ions with a charge of positive one (Na+) and chloride ions with a charge of negative one (Cl−).
Someone pls help me I will make you brain
Answer:
I would go with the first option. It shows how people having been releasing more and more carbon dioxide into the atmosphere.
Explanation:
a reaction is said to be ________ if the bonds formed during the reaction are stronger than the bonds broken.
Answer:
Exothermic
Explanation:
Bond strength has everything to do with the energy associated with it. What I mean by that, is a stronger bond will require a lot higher of an energy input to break than a weaker bond.
In the same way, energy is released when a bond is made. So, the formation of a stronger bond releases more energy than the formation of a weaker bond.
So, putting the two ideas together, if the bonds formed as stronger than the bonds broken, then more energy is released than taken in, which means energy is released overall over the course of the reaction. This means that the reaction is exothermic.
If there was energy taken in overall, this would be an endothermic reaction.
Let me know if that makes sense, and hope I helped! :)
Exothermic reaction is a reaction in which the bonds formed during the reaction are stronger than the bonds broken.
When chemical reactions occur, there will always be an accompanying energy change.
In exothermic reaction the bonds formed in the products are stronger than the bonds broken in the reactants whereas in endothermic reaction the bonds broken in the reactants are stronger than the bonds formed in the products.
Find out more at: https://brainly.com/question/1689737
3. If you drive for 3 hours at a constant speed and make it 400 miles, how fast did you go?
Answer:
133.333333333 mph
or
214.5791999994464 kph
Explanation:
Answer:133.333333333 mph
or
214.5791999994464 kph
Explanation:
What describes a chemical reaction?
Answer:
A chemical reaction is a process where two different substances or elements are mixed together. They then undergo some sort of chemical change to become a different substance altogether.
Explanation:
the reaction of zinc metal and hydrochloric acid produces hydrogen gas and zinc chloride. true or false?
Answer:
true.
Explanation:
Zn(s) + 2HCI(aq)=H2(g)+ZnCl2(g)
What happens to the wavelength and frequency of light as you move from red to violet?
A. Both wavelength and frequency increases.
B. Both wavelength and frequency decreases.
C. Wavelength decreases and frequency increases.
D. Wavelength increases and frequency decreases.
The formula of alkanes contain 3 5 7 and 9 carbon atoms
Explanation:
In organic chemistry, an alkane, or paraffin (a historical trivial name that also has other meanings), is an acyclic saturated hydrocarbon. In other words, an alkane consists of hydrogen and carbon atoms arranged in a tree structure in which all the carbon–carbon bonds are single.
14-Los
ojos
brillantes
Platero copian todo el
Y vivos de
paisaje de
Sol y de lluvia es simil o personificación o metáfora o gustativa
El fragmento es un ejemplo de metáfora porque presenta la relación entre la idea de los ojos de Platero con el clima soleado y lluvioso.
Metáfora es un término de origen griego que se refiere a la acción de traslación. En el lenguaje, una metáfora es una figura retórica que consiste en la asignación de un concepto o expresión a una idea sin que esta se relaciones directamente con esta definición.
De acuerdo a lo anterior, en el fragmento se presenta una metáfora en la que se relacionan los ojos de Platero con las horas de sol y lluvia.
Nota: Esta pregunta está incompleta porque el fragmento está incompleta. Aquí está el fragmento completo.
Los ojos brillantes y vivos de Platero copian toda la hora de sol y lluvia en cuyo ocaso, sobre el campo de San Juan, se ve llover, deshilachada, otra nube rosa.Aprenda más en: https://brainly.com/question/22976823
Why is carbon an element and not a compound?
A. Carbon bonds easily with oxygen, but not helium.
B. All carbon atoms have the same number of protons.
o C. All carbon atoms have the same number of neutrons.
.
D. Carbon is found in all living organisms.
Answer:
Carbon is found in all living organisms.
Answer: d
Explanation: i promise I've took the k-12 test
Use the diagram to identify each item.
Explanation:
atomic no. is 42
chemical symbol is Mo
no. of protons is 42
atomic mass is 95.95
no. of electrons is 42
no. of electron in outer most shell is 1
no of electrons in the n 3 shell is 18
no. of neutron is 96
The element molybdenum is 42nd element in periodic table with the symbol Mo and a mass of 96. It have 42 electrons and 42 protons.
What is Molybdenum?Molybdenum (Mo) is a transition metal in periodic table included in the d-block. The atomic number of molybdenum is 42 which is the number of protons and electrons in it.
The atomic number of a neutral atom is equal to the number of electrons in it. For a neutral atom the number of electrons and protons are equal and thus the number of both electrons and protons in Mo is 42.
Mass number is the sum of number protons and neutrons in an atom. The mass number of Mo is 96 and number of protons is 42. Thus, the number of neutrons is 96 -42 = 54.
The outer shells of Mo are 4d and 5s containing 4 and 2 electrons respectively. Thus the number of outer electrons is 6.The level n= 3 is M shell which contains 18 electrons for Mo.
To find more about Mo, refer the link below:
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Question 5
The energy produced by a generator can BEST be described as
A thermal
B chemical
C nuclear
D kinetic
E electrical
Answer:
E- Electrical
Explanation:
It converts mechanical energy to electrical energy
Select the answer that completes each statement.
The
founded the Virginia colony.
The
government took over the Virginia colony because too many colonists had died.
and
worked on the tobacco plantations.
The
was the first elective governing body in a British colony.
Answer:
1 colonists
2 England
3 slaves
4 the House of Burgesses
Answer:
:)
Explanation:
what is a chemical reaction of sulfric acid?
Sulfuric acid reacts violently with alcohol and water to release heat. It reacts with most metals, particularly when diluted with water, to form flammable hydrogen gas, which may create an explosion hazard. ... Hazardous decomposition products are as follows: sulfur dioxide, sulfur trioxide, and sulfuric acid fumes.
it acts violently with water or alcohol to release some heat, it does react to most metals, mostly when diluted with water to form flammable hydrogen gases, which may create an explosion hazard.
(i tried to make the g00gle answer less complicated) :)
Using a lamp without a shade and a baseball, Juan turned on the lamp and placed it on one side of a darkened room. He sat on the other side of the room and held the baseball between his face and the lamp.
Based on the model, what would the final step of his model?
Answer:b
Explanation:
Which traits does the western harvest mouse have that might be adaptive for the environment where it lives?
Its tail helps it climb down the tall grasses and lets it swing from the grass like a monkey in a tree
Explanation:
Answer:
Into the adaptive Trait!
Explanation:
Help meeeeeeeeeeeeeee
how many protons would the element with the atomic number 10 contain
Answer:
10
Explanation:
Atomic number = No. of protons
Therefore, the number of protons of an element with an atomic number of 10, is also 10.
how do anion formation and valence electrons relate?
Answer:
A cation is formed when a metal ion loses a valence electron while an anion is formed when a non-metal gains a valence electron. They both achieve a more stable electronic configuration through this exchange.
Answer:
A cation is formed when a metal ion loses a valence electron while an anion is formed when a non-metal gains a valence electron. They both achieve a more stable electronic configuration through this exchange.
Explanation:
Hope I helped!
Which terrestrial ecosystem is characterized by almost no rainfall, very hot days, and very cold nights?
A. Tundra
B. Temperate forest
C. Desert
D. Grassland
negative ions form when atoms _______ valence electrons.
Answer:
Negatively charged ions are called anions, and an anion is formed when an atom gains an electron. Thus, the atom has an extra charge of electrons,
Explanation:
so it becomes negatively charged.
Negative ions (or anions) are atoms that have gained electrons.
Electrons have a negative charge so if an atom is getting more of them, it's becoming more negative.
If you were to mass the reactants before a reaction and then mass the products after the reaction what would you expect to find and why?
pls answer fast ill give brainliest!
Answer:
No change...
Explanation:
The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction. For example, when wood burns, the mass of the soot, ashes, and gases equals the original mass of the charcoal and the oxygen when it first reacted. So the mass of the product equals the mass of the reactant.
Mark as Brainliest please...
a 200 g of sugar was dissolved in 100 ml of water describe the solution
A.diluted
B.concentrated
C. sweet
D. very sweet
................... answer.........pls........
Answer:
b
Explanation:
mark me as brainliest have a great day
Where do most metabolic reactions occur?
all of the above
O plasma membranes
O nucleus
O cytoplasm
Answer:
CYTOPLASM
Explanation:
MOST REACTION REQUIRE WATER TO OCCUR
SINCE ENZYME WORK BEST WHEN DISSOLVED IN WATER
WATER IS PRESENT IN CYTPLASM HENCE IT IS MAIN SITE OF MEABLIC REACTIONS
Someone pls help me I will make you brain
Answer:
lll and ll
Explanation:
lol can some have helo me out its easy
1, 2 and 3
Answer:
1. A
2. C
3. C
Explanation:
1. there are single cell organisms
2. all others are abiotic factors
3. individual is just one, population is one species, community is all populations, ecosystem includes abiotic and biotic factors, biome is a large geographical area.
Look at the image shown.
Two H are written with a horizontal straight line between them. (H-H)
What does this image represent?
Linear molecule with one domain
Linear molecule with two domains
Tetrahedral molecule with four domains
Trigonal planar molecule with three domains
Explanation:
It is known that an electron pair represents a domain. Hybridization of BF_{3}BF3 will be calculated as follows.
Hybridization = \frac{1}{2}[\text{Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge}]21[Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge]
Valence electrons of boron are 3 and no. of bonded atoms in a BF_{3}BF3 molecule is 3.
Therefore, calculate hybridization of BF_{3}BF3 as follows.
Hybridization = \frac{1}{2}[\text{Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge}]21[Valence electrons of central atom + no. of bonded atoms + negative charge - positive charge]
= \frac{1}{2}[3 + 3 + 0]21[3+3+0]
= 3
Hence, hybridization of BF_{3}BF3 is sp^{2}sp2 , that is, trigonal planar.
Thus, we can conclude that the given image represents that it is a trigonal planar molecule with three domains.
Answer:
electron pair => 1 covalent bond => same as H:H
Explanation:
The bar notation is generally accepted as a pair of electrons depicting a 'single' chemical bond. If two bars are shown (e.g; C=C) then two chemical bonds are represented. If three bars are shown (e.g; N≡N) then three chemical bonds are represented. This is the highest number of bonds that can exist between two elements. Hope this helps. :-)
What is the range of valence electrons that metals have?
How do the claims in drug ads impact the medical profession in 4 sentence
Answer:
But drug advertising is not all about deception. It can offer helpful information if you know what to look for. "Advertisements can offer information on drugs that may help many older men, especially those who have conditions that may be tough to treat or manage, such as diabetes and hypertension,"