Answer: A index fossil is any animal or plant preserved in the rock record of the earth that is characteristic of a particular span of geologic time or environment. A useful index fossil must be distinctive or easily recognizable, abundant, and have a wide geographic distribution and a short range through time.
Explanation:
Sodium is going in group 1, period 3. It contains A. One valence electron in its 3rd energy shell B three valence electron in its 1st energy shell C. 11 protons, 11electrons , 11 neutrons D. 11 protons, 11 electrons and 23 neutrons
Answer:
The correct answer is option A, that is, one valence electron in its third energy shell and option C, that is, 11 electrons and 11 protons.
Explanation:
The outermost electrons and the ones that take part in the process of bonding are termed as valence electrons. The atomic number of sodium is 11, thus, it possesses 11 protons and the atoms are neutral so it suggests that sodium has 11 electrons. By electronic configuration, it can be seen that in sodium, two electrons are present in the first shell, 8 in the second, and only one electron in the third shell, that is, 2.8.1. The electron present in the third shell is the valence electron.
WILL MARK BRAINLIEST!
Which of the following is not a catalyst?
A. Phosphorus
B. Platinum
C. Enzymes
D. Nickel
Answer: platinum
Explanation:
i think
How many moles are there in 5.2x10^23 atoms of CO2?
Answer:
0.86 moles of CO₂
Explanation:
Given data:
Number of atoms of CO₂ = 5.2×10²³ atom
Number of moles = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
5.2×10²³ atom× 1 mol / 6.022 × 10²³ atoms
0.86 mol
What is the only nonmetal in group 14?
Answer:
Carbon is the only nonmetal element in the group
Explanation:
Carbon and silica are the non- metal which are placed in group 14.
What is non metal?
Non-metals were elements on the periodic table's right side. Gases, liquids, and solids above are all examples of non-metals. Non-metals are not as lustrous as metals and have a drab color.
The carbon family belongs to Group 14. Carbon, silicon, germanium, tin, and lead are the five members. In their uppermost energy level, each of these elements possesses four electrons. Only carbon and silicon create nonmetal bonding among the Group 14 elements and form by sharing electrons .
To know more about non metal.
https://brainly.com/question/20602843.
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Given the speed of light (3.00×108 m/s) and a wavelength 4.3×10−7 m, what is the frequency?
Explanation:
Given :
speed of light (c) =
[tex]3.00 \times 108m/s[/tex]
wavelength (λ) =
[tex]4.3 \times {10}^{ - 7} \: m[/tex]
Equation :
c = λv
v = c/λ
[tex]v = \frac{3.00 \times {10}^{8} }{4.3 \times {10}^{ - 7} } [/tex]
Simplify
[tex]v = 6.976744186 \times {10}^{14} [/tex]
define state of matter
State of matter refers to the forms in which matter can exist.
There are basically three states: Solid, Liquid, Gaseous.
But nowadays we extend this and add two more states: Plasma, Bose-Einstein Condensate
help asap, please ! :(
Answer:
huaD?W
Explanation:
What is it called when it erupts onto Earth's surface?
Answer:
Magma
Explanation:
If you’re talking about what erupts from a volcano then lava but the lava turns into magma when it hardens
Answer:
Lava
Explanation:
When magma erupts from the volcano it becomes lava
Please help..
Describe how to perform a three step 1:100 serial dilution of 10μlof a bacterial culture.
Answer:
For a 1:100 dilution, one part of the solution is mixed with 99 parts new solvent. Mixing 100 µL of a stock solution with 900 µL of water makes a 1:10 dilution. The final volume of the diluted sample is 1000 µL (1 mL), and the concentration is 1/10 that of the original solution
Explanation:
i hope that gives you an idea
What is the subscript of 3MgC12
help!!!!! please
there is no question just fill in the question marks
Answer:
32 grams
Explanation:
Ignore the other answer. Two oxygen atoms have a mass of 32 grams. You can also arrive at this answer by subtracting the given values (i.e. 36 - 4 = 32).
WHAT DOES THE MASS OF AN OBJECT MEASURE HURRYYYYYYYYYYYYYYYYYYYYY
Answer:
object's inertial property
Explanation:
The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s2.
Answer:
The mass of the object internal property, or the amount of matter it contains
Explanation:
Hope this helps! Happy Holidays!
Using the model of the periodic table, which elements pictured are in the same period?
I Really need help With CHEMISTRY !! How do I do this?
1. Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 to 30.0 degrees Celsius, if the specific heat of the substance is 2.01J/g℃
2. A metal with a specific heat of 0.780 J/g℃ requires 45.0 J of heat to raise the temperature by two degrees Celsius. What is the mass of the metal?
Answer:
1: 100.5 J
2: 28.8 g
I found the answers online ;-;"
describe 3 different landforms.
Answer:
Mountains, hills, plateaus
Explanation:
in which group on the periodic table does the atom pictures belong?
a) 4
b) 6
c) 16
d) 14
Answer: Group 14
Explanation:
It's a carbon atom with 4 valance electrons.
Tenemos un cuerpo de 40 g cuya densidad es 1,24 g/mL y otro objeto de 70 g con una densidad de 0,96 g/mL. Si introducimos cada uno en un recipiente con agua, ¿en qué caso subirá más el nivel de líquido?
Answer:
El nivel de líquido subirá más al introducirse el objeto de 70 g.
Explanation:
El nivel de líquido subirá más con el objeto que tenga mayor volumen.
Por lo tanto vamos a calcular el volumen de ambos objetos, usando la definición de densidad:
Densidad = Masa / VolumenSi despejamos Volumen:
Volumen = Masa / DensidadAhora usamos esa ecuación y calculamos los volúmenes:
Objeto 1 ⇒ 40 g ÷ 1,24 g/mL = 32,26 mL Objeto 2 ⇒ 70 g ÷ 0,96 g/mL = 72,92 mLPor lo tanto el nivel de líquido subirá más con el segundo objeto.
In an endothermic reaction, energy is
A. absorbed.
B. released.
C. converted to mass.
D. synthesized.
Answer:
answer is A kxxhhxhxxhjxjxjxxj
How many more valence electrons does this atom need to fulfill the Octet
Rule?
Answer:
In the valence shell, it should have 8 valence electrons.
Explanation:
How many atoms are there in 7.6 moles of Iron?
Answer:
45.77 × 10²³ atoms
Explanation:
Given data:
Number of moles of iron = 7.6 mol
Number of atoms = ?
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
7.6 mol × 6.022 × 10²³ atoms / 1 mol
45.77 × 10²³ atoms
what mining biodivirsity
Answer:
Explanation:
Mining affects biodiversity at multiple spatial scales (site, landscape, regional and global) through direct (i.e. mineral extraction) and indirect processes (via industries supporting mining operations, and external stakeholders who gain access to biodiversity-rich areas as the result of mining).
Potasyum-40 küçük atom numaralı doğal radyoaktif birkaç element izotopundan biridir ve doğada K izotopları içerisindeki bolluk yüzdesi %0,012'dir. 1,65 mg K/mL içeren bir bardak sütü içtiğiniz zaman kaç tane 40K atomu yutmuş olursunuz? (1 Bardak süt 225 mL, K: 39,10 g/mol)
Answer:
6.707 × 10¹⁷
Explanation:
From the information given:
40 ^ K kütlesi = sütteki K kütlesi × 40 ^ K / 100 kütle yüzdesi
nerede;
sütteki K kütlesi = 1.65 mg of K/mL × 225 mL = 371.25 mg of K
∴
40 ^ K kütlesi = 371.25 × 0.012/100
40 ^ K kütlesi = 0,04455 mg = 4.455 × 10⁻⁵ grams
40 ^ K mol sayısı = 40 ^ K kütlesi / molar kütle
= 4.455 × 10⁻⁵/40
= 1.11375 × 10⁻⁶
Son olarak, 40 ^ K = mol × Avogadro sayısı atomları
= 1.11375 × 10⁻⁶ × 6.022 × 10^23
= 6.707 × 10¹⁷
Which of the following uses mechanical energy to function?
a computer
a battery
a microwave oven
a windmill
Answer:
Explanation:fff
How to we measure 1,energy?
2,Degrees
3,Anemometer
4,Barometer
5,Calories
Answer:
anemometer i believe :)
What is the atomic mass of an atom that contains 21 protons, 21 electrons, and 25 neutrons
44.95591 atomic mass units
Have a Merry Christmas!
Every organism has a unique common name.
Group of answer choices
True
False
Plz answer the test end in 20 min
Answer true
Explanation:
Every recognized species on earth (at least in theory) is given a two-part scientific name. ... These naming rules mean that every scientific name is unique. For example, if bluegill sunfish are given the scientific name Lepomis macrochirus, no other animal species can be given the same name
HELPPPPPPPPPPPPPPPPPPPPPPPPPPPP
Answer:
the awnser is a
Explanation:
obvious lab safetty
What is a substance that is dissolved in another substance?
O solvent
O compound
O solution
O solute
Answer:
Solute
Explanation:
the substance that dissolves in a solvent to produce a homogeneous mixture.
Help meeeee pleaseee create a biography of an element
Answer:
Explanation:
A biography is a specialized form of history. It is an account of events based upon the example of one person's life. There are four basic types of biographies: historical fiction, academic, fictional academic, and the prophetic biography.
hurry and answer plz!
What does DNA contain?
C. Instructions for energy transfer
D. Instructions for searching for food
B. Instructions for learned behaviors
A. Instructions for inherited traits
Answer:
A. Instructions for inherited traits
Explanation:
Your traits (what makes who you are) are from your DNA, and the DNA sends instructions on how your body preforms to use/inherit those traits.
I don’t know a lot about DNA, but this is the best information I can provide.
Hope this helps! :)