Answer:
1.04
Explanation:
According to the chart, very few elements are required for our planet to exist in its current state. Analysis of the chart would lead an observer to conclude that
our planet is exists in its unique state solely because of the element carbon
our planet is mainly composed of hydrogen
our planet is mainly composed of a few key elements, but other elements are present as well
our planet is composed of 92 naturally occurring elements
Answer:
the 3rd answer
Explanation:
the earth is composed of key element like carbon Oxygen nitrogen phosphorus hydrogen and sulphur CHNOPS but they are other element on earth too even though they are not as essential
11Which type of bond is made when two atoms share one pair of electrons
Answer:
A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted by the two atomic nuclei. A covalent bond forms when the difference between the electronegativities of two atoms is too small for an electron transfer to occur to form ions.
Describe the nucleus of the
atom.
Answer:
The nucleus of atom is composed of two subatomic particles that each have charges.
Protons, which are positively charged particles.Neutrons, which are neutrally charged particles.Both reside in the nucleus of an atom. The amount of protons and neutrons (Electrons can to) is what helps us identify each atom apart. Electrons are NOT in the nucleus of atom but orbit it in outer layers called orbitals.
When an organism dies it is exposed to many different types of biotic and abiotic factors biotic factors include?
Answer:
the organisms themselves,other organisms,interactions between living organisms, and even their waste.
Are we alone in the universe?
Answer:
no ofcourse not!
Explanation:
Answer:
no
Explanation:
the universe is way too big, maybe not in a conventional form but there are definitely aliens
What can you say about the reactants of photosynthesis and the products of cellular respiration?
Answer:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by-products and ATP is energy that is transformed from the process.
Explanation:
carbon reduction process is not applied for extraction of alkali metal . why ?
Answer:
The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon
Explanation:
wht will react with acid to giv bluish green salt nd water ??
Explanation:
When dilute HCl is added to a small amount of copper oxide in a beaker, a greenish-yellow gas is released and a bluish-green solution is formed. Since the metal oxides such as a Copper oxide (CuO) are basic in nature, it reacts with acids such as HCl to form the corresponding salt and water.
Which are effects of long-term exposure to mustard gas? Select all that apply. One, some, or all responses may be correct.
The effects of long-term exposure to mustard gas causes mortality and chronic respiratory disease.
Exposure to mustard gas in the long term can result in mortality from influenza, pneumonia as well as chronic breathing disease. Exposure for long term leads to respiratory complications and septic shock. Extensive breathing in the environment of mustard gas can cause chronic respiratory disease, respiratory infections or death.
Extensive eye exposure to this gas can cause permanent blindness. Exposure to mustard gas may also increase the chances of lung and respiratory cancer so we can conclude that mustard gas is lethal and can cause a number of diseases in a person who is exposed to it.
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Ow is the relatively high melting point of sodium chloride related to its structure at the atomic scale? Observe sodium chloride crystals with a hand lens. Use your observations and the model of sodium chloride to support your claim.
Answer:
see explanation
Explanation:
How is the relatively high melting point of sodium chloride related to its structure at the atomic scale? Observe sodium chloride crystals with a hand lens. Use your observations and the model of sodium chloride to support your claim.
Unlike the raltively low melting point of water (100 °C), NaCl has a much higher melting point (801 °C),.
Theater molecules in ice are held together by hydrogen bonds, which are relatively weak.
The ions in NaCl are held together by ionic bonds, whose electrostatic ,force is much greater.
The crystal structure makes the force even greater.
imagine a chloride ionin a NaCl crystal.
It has Na ions in front, behind, to the left, to the right, above and below.
Likewise the Na ion has Cl ions in front, behind, to the left, to the right, above and below.
It takes a lot of energy to berak these bonds and temprature is a measure of energy.
if you try the experiment make certain you are undr a fune hood and wear protective loves and apron. 801 °C can seriously burn skin and clothing
The temperature at which the liquid and the solid of refined compounds and elements can occur stable and in equilibrium is called the melting point.
How are the structure and the melting point related?Water has a relatively lower melting point of 100 °C compared to [tex]\rm NaCl[/tex] at 801 °C which has a much higher melting point. The water molecules in ice are bonded jointly by somewhat weak hydrogen bonds.On the other hand, [tex]\rm NaCl[/tex] ions are bonded together by ionic bonds, that has a greater electrostatic force and its crystal structure produces the force to be even more prominent.When a sodium and chloride ion is imagined in the [tex]\rm NaCl[/tex] crystal the sodium ions are present above, below, left and right of the structure and the chloride ions are similarly placed in the crystal structure.This type of structure needs a lot of energy to break and hence the melting point of the salt is more compared to the water.
Therefore, the melting point is related to the structural organization of the atoms.
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What is activation energy
Answer: Activation energy is defined as the minimum amount of extra energy required by a reacting molecule to get converted into product. It can also be described as the minimum amount of energy needed to activate or energize molecules or atoms so that they can undergo a chemical reaction or transformation.
Explanation:
How many grams of hydrogen are needed to fully react 621. 9 grams of nitrogen gas.
Answer:
9 grams of nitrogen gas
Explanation:
When refering to a gas, the higher the temperature, the faster the particles move:
True
False
Answer:
TrueExplanation:
In Gas,The movement of particles depends upon their temperature. When, the temperature is high the movement of the particles is faster.When, the temperature is low the movement of the particles is slower down and move close together.Hence,
The above statement is true for, the gas particles moves faster in high temperature.
c) ¿Qué ocurriría si tenemos disueltos 200 g de
nitrato de potasio en 300 g de agua a 60°C
y enfriamos la disolución hasta los 10 °C?
I WILL GIVE YOU BRAINLIEST PLEASE ANSWER ASAP NEED HELP!!!!!!!
I WILL GIVE YOU BRAINLIEST PLEASE ANSWER ASAP NEED HELP!!!!!!!
I WILL GIVE YOU BRAINLIEST PLEASE ANSWER ASAP NEED HELP!!!!!!!
what are the oxidation numbers for manganese and nitrogen in Mn3N4
Explanation:
I think
maganese is +7 and Nitrogen is +5
sorry if I am incorrect I haven't done chemistry in a year
btw for chemistry if you need help with equations I used this equation balancer called chemical aid it helps
In Mn3N4, the compound consists of three manganese (Mn) atoms and four nitrogen (N) atoms.
To determine the oxidation numbers, we can assign x as the oxidation number for manganese and y as the oxidation number for nitrogen.
Since the compound is neutral overall, the sum of the oxidation numbers must equal zero.
For the three manganese atoms:
3x = 0
x = 0
For the four nitrogen atoms:
4y = 0
y = 0
Therefore, the oxidation numbers for manganese (Mn) and nitrogen (N) in Mn3N4 are both 0.
can anyone tell me "what are the exceptions of law of reciprocal proportions??"
Which highway run through comlumbus
Answer:
Highway 22 ,GA 31820
Explanation:
What is the mass of 1,300 cm of gasoline? The density of gasoline is 0.67 g/cm.
Answer:
Volume x Density = Mass of a substance
1300 x 0.67 = 871
The mass is 871 (unit)
There is 200 grams of water on a stove. The water is currently 25 C. How much energy in joules must be used to raise the water to 90 C?
Answer:
q
=
64 kJ this is answer. .
Which statement best describes how inflating a balloon is evidence of matter?
O It changes color and length.
o It changes mass and temperature.
o It changes size and shape.
O It changes texture and width.
Answer:
It changes size and shape
Explanation:
Proving Air Is Matter
One way to prove that air is made of matter is to blow up a balloon. Before you add air into the balloon, it is empty and shapeless. When you puff air into it, the balloon expands, so you know it is filled with something—air is taking up the space.
What causes streams to form?
O absorption
O precipitation
O glaciers
O lakes
Answer: essay the answer is B: precipitation
Explanation:
Lead-208 is a radioactive isotope. Explain what makes the nucleus of Lead-208 so unstable
a. Show Lead-208 undergo alpha decay, THEN the product undergoes beta decay, Determine the final product
Please Help, Thnx
Answer:
See Explanation
Explanation:
Alpha Decay is the emission of helium nuclei (₂He⁴). That is, two protons and two neutrons are emitted. By formula equation ...
₈₂Pb²⁰⁸ => ₈₀Hg²⁰⁴ + ₂He⁴ => ₈₀Hg²⁰⁴ + (₂α⁴)⁺²
Note the sum of superscripts & subscripts of reactants (₈₂Pb²⁰⁸) must equal sum of superscripts & subscripts of products (₈₀Hg²⁰⁴ + ₂He⁴); that is ...
∑mass reactants = ∑mass products => 208 = 204 + 4
∑atomic no. reactants = ∑atomic no. products => 82 (Pb) = 80 (Hg) + 2 (α⁺²)
Hope this helps. Doc :-)
Which set of laboratory equipment would most likely be used with a crucible
Answer:
That should be crucible tong
1. The electron configuration below represents the ground state of an atom.
2-8-6
This element is found in the Periodic Table in-
Answer:
[tex] {S}^{16} [/tex]
group 16 period 2 of the periodic table
note: that is not the electronic configuration, that is the Bohr model.
There are various kind of elements that are present in periodic table. Some elements are harmful, some are radioactive, some are noble gases. Sulfur is the correct answer for our given question
What is periodic table?
Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.
We can find any element in periodic table if its electronic configuration is given. From electronic configuration, we can find the group number and the period number. So, according to our question the configuration is 2,8,6. Form here we can say that atomic number of element is 16 and the valence electron is 6 so the only group in the periodic table that has valence electron 6 is the group 16 that is oxygen family.
Therefore Element is sulfur and is found in group 16 and period 2
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9) What is the final pressure in the container shown below after the valve is opened and the gases are allowed
to flow? (The gases do not act)
0
4.00 am
3.00
NE
2.00 am
2.00 L
A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.
We have 2 containers connected by a valve.
One container has a volume of 3.00 L and contains O₂ at 4.00 atm. The other container has a volume of 2.00 L and contains Ne at 2.00 atm.
When the valve is opened, the total volume is the sum of the 2 containers.
[tex]V_2 = 3.00 L + 2.00 L = 5.00 L[/tex]
Assuming constant temperature and ideal behavior, we can calculate the final pressure of each gas using Boyle's law.
O₂
[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{4.00atm \times 3.00L}{5.00L} = 2.40atm[/tex]
Ne
[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{2.00atm \times 2.00L}{5.00L} = 0.800atm[/tex]
The final pressure in the container will be the sum of the final pressures of the gases.
[tex]P = 2.40 atm + 0.800 atm = 3.20 atm[/tex]
A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.
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What do the groups (columns) and periods (rows) tell you about the elements on the periodic table?
Answer:
Groups: The vertical column of the periodic table that signifies the number of valence electrons in an element.
Period: The horizontal rows in the periodic table that signify the number of electron shells in an element.
Explanation:
Answer:Groups: The vertical column of the periodic table that signifies the number of valence electrons in an element. Periods: The horizontal rows in the periodic table that signify the number of electron shells in an element.
Explanation:
The table has seven rows and 18 columns. Each row represents one period; the period number of an element indicates how many of its energy levels house electrons.The columns of the table represent groups, or families, of elements.
In your own words, explain in a simple, short way of what the periodic table is.
Answer:
The periodic table is a chart that arranges all of the chemical elements.The chemical elements are the substances that make up all matter. The amount of tiny particles in each element is the atomic number, which is how you identify it.
Explanation:
Hund's rule: states that electrons always enter an empty orbital before they pair up.
Answer:
true
Explanation:
How many different types of atoms are in the formula Ba(OH)2 • 8H2O?
A)3
B)2
C)11
D)22
đơn chất nào sau đây tác dụng với dung dịch axit sunfuric loãng sinh ra khí ?
a đồng
b cacbon
c nhôm
d lưu huỳnh
Answer:
C. Al
Explanation:
2Al+ 3H2SO4(l)------> Al2(SO4)3+ 3H2
