I have a homework and I need help please.
Answer:
yeah we cant see it
Explanation:
Using the model of the periodic table, which elements pictured are in the same period?
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.
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
Does anyone know how to determine if a reaction is a redox or not?
2Ca+O2→2CaO2 is the reaction. I've already made it a balanced equation, I just need to determine if its a redox or not.
Thank you!
The reaction is included in a redox reaction
Further explanation:
Given
Reaction
2 Ca + O₂ → 2 CaO
Required
a redox reaction
Solution
Redox reactions are reactions where there is a change in oxidation number
Oxidation is an increase/increase in oxidation number, while reduction is a decrease/decrease in oxidation number.
Reducing agents are substances that experience oxidation and oxidizing agent are substances that experience reduction
in the above reaction is included in a redox reaction because there is a change in oxidation number
Ca⇒Ca²⁺+ 2e⁻(for balanced equation : 2Ca⇒2Ca²⁺+4e⁻)
Oxidation ( 0 to +2)
O₂+2e⁻⇒O²⁻(for balanced equation : O₂+4e⁻⇒2O²⁻)
Reduction (0 to -2)
help asap, please ! :(
Answer:
huaD?W
Explanation:
How to we measure 1,energy?
2,Degrees
3,Anemometer
4,Barometer
5,Calories
Answer:
anemometer i believe :)
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!
where information about each element is located
Answer:
On the pereiodic table.
Explanation:
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).
The chemical equation for the combustion of acetylene (C2H2) is given below.
2C2H29) + 502(9)—-4C02(g) + 2H2O(g)
What volume of oxygen at STP is required for the complete combustion of 100.50 mL of C2H2?
Answer:
309.2 ml of oxygen
Explanation:
2 ( 12X2 +Ix 2 ) = S2 ml
O2 = 5 x 16 x 2 = 160 ml
volume of O2 needed = 160×100. 5 / 52 = 309.2 ml
Answer:
d
Explanation:
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!
What energy is formed when you put your hands together and rub them up and down rapidly
Answer:
When you rub your hands together thats mechanical energy. Once you hands warm up its heat energy.
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.
#SPJ2
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
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
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).
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
What type of bond holds nitrogen and sulfur together in a compound?
a. hydrogen
b. covalent
c. ionic
d. they can not bond together
Answer:
b covalent . A covalent bond holds atoms that share valence electrons
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
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]
WILL MARK BRAINLIEST!
Which of the following is not a catalyst?
A. Phosphorus
B. Platinum
C. Enzymes
D. Nickel
Answer: platinum
Explanation:
i think
Which of the following uses mechanical energy to function?
a computer
a battery
a microwave oven
a windmill
Answer:
Explanation:fff
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.
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.
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.
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
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! :)
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