Answer:
First Question:
Melting is a physical process that involves the phase transition of a substance from its solid to its liquid state. Burning, on the other hand, is a chemical process that involves a substance being broken down and changed into different substances. It's still the same substance, though: water.
Second Question:
Mass is therefore never conserved because a little of it turns into energy (or a little energy turns into mass) in every reaction. But mass+energy is always conserved. Energy cannot be created out of anything.
Explanation:
A car travels a distance of 200 meters in 10 seconds. What is the average speed of the car?
Answer:
72,000mph
Explanation:
hope this helps
Looking at the chemical reaction above, 32 grams of Oxygen gas combine with an unknown amount of Carbon to produce 44 grams of Carbon dioxide when heat is added. What is the unknown amount of carbon in this chemical reaction?
Answer:
12 g of C.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
O2 + C —> CO2
Finally, we shall determine the mass of O2 and C that reacted. This can be obtained as follow:
Molar mass of O2 = 16 × 2 = 32 g/mol
Mass of O2 from the balanced equation = 1 × 32 = 32 g
Molar mass of C = 12 g/mol
Mass of C from the balanced equation = 1 × 12 = 12 g
Thus, from the balanced equation above, 32 g of O2 reacted with 12 g of C.
PLEASE HELP!!!! ANSWER 2 QUESTIONS FOR 50 POINTS AND BRAINLIEST!
Explain a limiting factor for each location in the South America Ecosystems Interactive
Answer:
just getting 5 points
Explanation:
Find the molarity of 4025 mL solution, which contains 7.85 g of CaF2.
Answer:
0.025M
Explanation:
Molarity (M) = number of moles (n) ÷ volume (v)
To find the mole of CaF2, we need to find its molar mass:
Ca= 40g/mol, F=19g/mol
CaF2 = 40 + 19 (2)
40 + 38
= 78g/mol.
Using; mole = mass/molar mass
mole = 7.85/78
mole = 0.1006
mole = 0.101mol
Molarity (M) = number of moles (n) ÷ volume (v)
Volume in Litres = 4025mL/1000
= 4.025L
Molarity (M) = 0.101/4.025
Molarity = 0.025M
what must happen for an electron to jump to different energy level?
Answer:What must happen for an electron to move to a higher energy level? ... → The electron must transfer some energy to the nucleus. → The electron must absorb light energy.
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3 questions for branliest!! Please help.
1. Noble Gas with the largest radius?
2. Least electronegative of the halogens? (not astatine)
3. What element is 1s2 2s2 2p6 3s2?
Someone help me out please
Answer:
(A)
Explanation:
ice is crystalline and rigid
Answer the Question where it says, “Model It!” Thank You! Really Appreciate It! :)
Answer: Thx for the free points brother!
Explanation: Thx!
At -15°C, water is a:
solid,liquid,gas
Answer:
Water is a solid.
Explanation:
Water freezes at 0° C, or 32°F.
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El clor és un element cabdal en la potabilització de l'aigua. A la natura s'han trobat dos isòtops del clor, 35Cl i 37Cl. Indica les semblances i diferències entre aquests dos isòtops si els àtoms es troben en un estat elèctricament neutre.
Answer:
Veure explicació per a més detalls
Explanation:
Si mirem els dos àtoms, descobrirem que són àtoms de clor. A l'ésser àtoms de clor, tenen el mateix nombre atòmic (17). Aquesta és la semblança entre els dos àtoms.
Tots dos tenen diferent nombre de neutrons. El Cl-37 té 20 neutrons, mentre que el Cl-35 té 18 neutrons. Tots dos exhibiran les mateixes propietats químiques però propietats físiques i velocitats de reacció lleugerament diferents.
Why does sodium have the same dot diagram as lithium?
Explanation:
Sodium and Lithium both belongs to same group (Group 1).
Group 1 element have 1 valence electron. That's why Group 1 element contains Na• , Li• one electron on it's atom.
Note -
It's not a dot . It's an electron.
Which element has a larger atomic radius than sulfur? O chlorine O cadmium fluorine oxygen
Answer: solo necesito puntos lo siento
Explanation:
Answer:
Cadmium has larger atomic radius than sulfur.
Explanation:
Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period: when a proton is added the pull of the electrons towards the nucleus is larger, so the size of the atom decreases.
Hence, you can compare the elements that belong to a same period and predict that the atom with lower atomic number (number of protons) will haver larger atomic radius. With that:
Oxygen and fluorine are in the period 3, being oxygen to the left of fluorine, so oxygen is larger than fluorine.
Sulfur and chlorine are in the period 4, being sulfur to the left of chlorine, so sulfur is larger than chlorine.
Now see whan happens down a group. Atomic radius increases from top to bottom within a group due to electron shielding. That permits you to compare the size of the elements in a group:
Fluorine and chlorine are in the same group (17), with chlorine directly below fluorine, so the atomic radius of chlorine is larger than the atomic radius of fluorine.
Sulfur and oxygen are in the same group (16), with sulfur directlly below oxygen, so sulfur the atomic radius of sulfur is larger than the atocmi radius of oxygen.
So far, you can rank the atomic radius of sulfur, chlorine, fluorine, and oxygen, in increasing order as:
O < F < Cl < S, concluding that O, F, and Cl have smaller atomic radius than S.
Cadmiun, Cd, is to the left and below sulfur, so both electron shielding (down a group) and increase of the number of protons (down a period) lead to predict the cadmium has a larger atomic radius than sulfur.
What does it mean when there is a physical change?
3?
Answer:
A physical change is a change to the physical—as opposed to chemical—properties of a substance. They are usually reversible. The physical properties of a substance include such characteristics as shape (volume and size), color, texture, flexibility, density, and mass.
Describe Pasteur’s results and how they helped disprove spontaneous generation.
Answer:
Pasteur-Disproved spontaneous generation using S-necked flasks that were open to the air but did not let microorganisms in. Broth boiled in the flasks did not become contaminated. ... The organisms could have come from the air and settled into the broth.
Explanation:
Which object made of one or more smaller units would make the best model of a group of cells from a plant?
An object that is made of one or smaller units would make the best model of a group of cells from a plant is a sponge. The correct option is B.
What are cells?All living things, from microbes to people, rely on cells for structure and function. Scientists regard them as the tiniest form of life. Cells contain the biological machinery that produces the proteins, chemicals, and signals that are responsible for everything that occurs within our bodies.
The cellular level is the most fundamental level of organization. A cell is the fundamental unit of life and the smallest reproducible unit. While the form and function of cells vary widely depending on the organism, all cells share a few characteristics.
Cells combine to form tissues, and tissues combine to make organs. Organ systems, such as the skeletal and muscular systems, are made up of organs.
Therefore, the correct option is B. sponge.
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Which statement is true?
A.
A molecule having a covalent bond can be ionic.
B.
A molecule having a covalent bond is always polar.
C.
A molecule having a covalent bond may be polar or nonpolar.
D.
A molecule having a covalent bond is always nonpolar.
Answer:
c) A molecule having a Covalent bond may be polar or non polar
another name for a period is a family.
A.true
B.false
worth 40 points
Answer:
False
Explanation:
hope it helps
A scientist plants two rows for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the height of the corn growth over the course of 5 months. What is a constant in this experiment?
Answer:
Water and light intensity
Explanation:
In an experiment, the component parts of the experiment usually includes a variable which is of two types- independent variable, dependent variable; a constant and a control.
An independent variable is the part of the experiment the person changes or controls.
The dependent variable is the part of the experiment that changes due to changes being made to the independent variable.
The control group is a part of the experiment in which all variable factors have been kept constant and which is used as a standard to compare with other trials of the experiment.
A constant is the part or factor which do not change and is kept constant during the experiment.
In the experiment conducted by the scientist, the two rows of plant receives the same amount of water and light intensity, therefore, they are both the constants.
Name the three general categories into which the elements are divided.
The three general categories into which the elements are divided are metals, nonmetals, or metalloids.
What are elements?Elements are the chemical elements of the periodic table. There are 118 elements in the periodic table. The periodic table displays all the elements according to their atomic numbers.
They are categorized into three terms. They are metals, which are malleable, soft, and luster. Metals are crystalline solid and naturally present in nature. Non-metals are those elements that are hard and brittle and not very reactive.
Metalloids are those elements that have the quality of both metals and non-metals, and they can act like both with time. They are also called semimetals.
Thus, the three general categories are metals, nonmetals, and metalloids.
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in which situation are waves transmitted
Answer:
A camp fire lights up a cave
What is the name of Na2CO3
Answer:
its sodium carbonate
Explanation:
Answer:
Explanation:
you just said it Na2CO3
the average mass of all the isotopes of an element is called the ______________.
will mark brainlest for the best answer.
good luck
Answer:
atomic mass
Explanation:
the avergae mass of all the isotopes of an element is called the atomic mass. the atomic mass is the mass of an atom.
Will give brainliest !
Answer:
C
Explanation:
I don't have this class but I'm 99.9% sure it's C. :)
A measurement must have a ________________ and ___________________ to be concerned correct.
Answer:
Explanation:
grips with three basic problems: error; representation, which is the justification of number …
El cloro es un elemento capital en la potabilización del agua. A la natura se han encontrado dos isótopos del cloro, 35Cl y 37Cl. Indica los parecidos y diferencias entre estos dos isótopos si los átomos se encuentran en un estado eléctricamente neutro.
Answer:
I cant understand. Can you translate it to english?
how does the concept of conservation of mass apply to chemical reactions?
Answer:
mass cannot be created nor destroyed just moved around
Explanation:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed so it can only be moved around during a chemical reaction
BRAINLIEST TOTHE CORRECT ANSWER!!! Why is C6H12O6 not considered to be an empirical formula for glucose?
Its molecular formula is C6H12O6. Since each of the subscripts is divisible by 6, the empirical formula for glucose is CH2O.
It´s just the way it is. Have a good day!
Its chemical structure is C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]. The empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.
What is empirical formula?The definition of an empirical formula for a compound is one that displays the ratio of the components present in the complex but not the precise number of atoms in the molecule. Subscripts are used next to the component symbols to indicate the ratios.
If you are aware of the compound's molar mass, you may apply the equation to determine its molecular composition. Dividing the compound molar mass either by empirical formula mass after calculating the organic compound with the formula mass to get this. Its chemical structure is C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]. The empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.
Therefore, the empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.
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Which type of eclipse happens when the moon is in position 1? solar eclipse lunar eclipse Earth eclipse
A. solar eclipse
B. lunar eclipse
C. Earth eclipse
Answer:
B lunar eclipse
Explanation:
Answer:
Lunar Eclipse
Explanation:
I have a science book that shows.
When you stir sugar into your tea with a spoon, the tea keeps swirling
even after you take your spoon out. *
which law of motion is it?
When you stir sugar into your tea with a spoon, the tea keeps swirling
even after you take your spoon out.This is first law of motion.
What is motion?
Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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