what period has only two valence electrons when it is filled?
Answer:
Across each row, or period, of the periodic table, the number of valence electrons in groups 1–2 and 13–18 increases by one from one element to the next. Within each column, or group, of the table, all the elements have the same number of valence electrons.Oct 30, 2019
Explanation:
A scientist researching methods to convert used motor oil into gasoline would most likely be investigating which process?
joining molecules into longer chains
breaking molecules into smaller chains
changing straight chains into rings
changing rings into straight chains
Answer:
breaking molecules into smaller chains
Explanation:
A scientist researching methods to convert used motor oil into gasoline would most likely be investigating the process of breaking molecules into smaller chains.
How are molecules broken down?Larger molecules can be broken down into smaller molecules by breaking the bonds that hold them together.
According to this question, a scientist is trying to research methods to convert used motor oil into gasoline.
The most likely research methods that the scientists would use to investigate is the process of breaking molecules into smaller chains.
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A civil engineer design mostly
Answer:
They design building structures mostly .-.
Explanation:
Can someone please help me with the three question
Answer:
the atomic number of magnesium is 12 the atoms that cause reactions are 2 the rest are the research on them later today
The pieces of land surrounded by water on all sides. *
Beaches
Barrier Islands
Delta
Tides
Answer:
Barrier Islands xtrvhb
Ian needs to separate a liquid mixture of alcohol and water. Which physical property will best help Ian separate the mixture?
A. mass
B. volume
C. boiling point
D. melting point
Answer:
B. Volume Your welcome
Elements that have a low force of attraction tend to have- a) High ionization energy and low electronegativity b) Low ionization energy and low electronegativity c) High ionization energy and high electronegativity d) Low ionization energy and high electronegativity
Answer:
Explanation:
Low electronegativity and low ionization energy
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:
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.
H2O2(1) --> H2O2(g)
Figure 1
Is this a physical or chemical reaction?
Answer:
Physical reaction
Explanation:
Since there are no other chemicals in the equation, but the state of the chemical is going from a liquid to a gas, you can conclude that this is a physical reaction.
Which of the following is a property that nickel, iron, and cobalt DON'T share?
a) Shiny
b) Poor conductivity of electric current
c) Good conductivity of thermal current
d) None of the above
is a banana a kinetic energy or potential energy
Answer:
Potential
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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when warm air and cold air mix why will the warm air move upward?
A student measured 30.0 mL of water in one graduated cylinder and measured 90.0 mL of water in another graduated cylinder. Which statement is true? 4 points The one containing 90.0 mL has the larger density. They both would be the same, as the density of matter is not affected by amount. The one containing 30.0 mL has 1/3 the density of the one containing 90.0 mL.
Answer:20
Explanation:not true jus doing it for points
Help me I don’t understand this
electron configuration of yttrium
Answer:
[Kr] 4d1 5s2
Hope this helped :)
The graph below represents a function.
What is the value of f(4)
Answer:
I'm not sure if this is what your looking for but, the ordered pair would be 2,4
Explanation:
the line intercepts the y axis at point 2 and same on the x axis the line intercepts at 4
The graph below represents a function. The value of f(4) is -4
What is function?Function is defined as a phrase, rule, or law defining a relationship between one variable and another.
Functions are common in mathematics and are required for the formulation of physical relationships in the sciences.
There are various types of functions.
Liner functionIdentical functionQuadratic functionRational functionAlgebraic function Polynomial function Cubic function etc. and many moreThe value of f can be calculated by using formula
fx = 4 - x2
f(4) = 4 - 4 x 2
f(4) = 4 - 8
f(4) = -4
Thus, the graph below represents a function. The value of f(4) is -4
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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.
Someone help me out please
Answer:
(A)
Explanation:
ice is crystalline and rigid
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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Neutrons and protons have the same relative mass (true or false)
in which situation are waves transmitted
Answer:
A camp fire lights up a cave
How is the atomic number used to determine the identity of an atom
Answer:
"The number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge. The atomic number tells you the number of protons in one atom of an element. It also tells you the number of electrons in a neutral atom of that element."
Explanation:
-irion-isd.org:)
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The number of protons in an element's atom is represented by the element's atomic number. The atomic number identifies the element because the number of protons establishes the identity of the element.
What is atomic number ?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number. This is the number of protons present in the nucleus of each atom of that element, or the proton number, for conventional nuclei.
The number of protons in an atom is the atomic number. It is sometimes referred to as the proton number for this reason. The capital letter Z is used to represent it in calculations.
The word zahl, which translates to "number of numerals" in German, or "atomzahl," a more recent word that means "atomic number," are the origins of the letter Z.
Thus, the number of protons in an element's atom is represented by the element's atomic number. The atomic number identifies the element because the number of protons establishes the identity of the element.
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When _____________ light strikes an object, the _____________ of the object depends on how the object _____________ and/or _______________ the colors of light.
Answer:
When white light strikes an object, the color of the object depends on how the object absorbs and/or reflects the colors of light.
Explanation:
White light is composed of seven distinct colours of light; red, orange, yellow, green, blue, indigo and violet. These colors can be seen when white light is passed through a prism.
The color of an object depends on the colors in the light that falls on it and also on the ability of this object to absorb or reflect this light.
When white light strikes an object, the color of the object depends on how the object absorbs and/or reflect the colors of light.
For example, when white light falls on an object and the object appears green, it means that that object has absorbed all the other colors of white light but reflects green light.
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.
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.
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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calculate the energy processed by a single proton of the each following types electromagnetic radiation:
a.6.32 x 10^20 s-1
b. 9.50 x 10^13 hz
c.1.05 x10^16 s^-1
#G10 Chemistry
a. 4.2 x 10⁻¹³ J
b. 6.3 x 10⁻²⁰ J
c. 7 x 10⁻¹⁸ J
Further explanationRadiation energy is absorbed by photons
The energy in one photon can be formulated as
[tex]\large{\boxed{\bold{E\:=\:h\:.\:f}}}[/tex]
Where
h = Planck's constant (6,626.10⁻³⁴ Js)
f = Frequency of electromagnetic waves
a.
[tex]\tt E=6.626.10^{-34}\times 6.32.10^{20}=4.1876.10^{-13}~J[/tex]
b.
[tex]\tt E=6.626.10^{-34}\times 9.50.10^{13}=6.2947.10^{-20}~J[/tex]
c.
[tex]\tt E=6.626.10^{-34}\times 1.05.10^{16}=6.9573.10^{-18}~J[/tex]
3.5 liters to cubic centimeters
Answer:
3500
Explanation: