Answer:
Explanation: The air inside the bulb is taken out and replaced with a gaseous mixture of argon and nitrogen which help ensure a longer-life for the filament. The bulb will be tested to make sure they're up to the job.
write the metals and nonmetals and metalloids in the first 30 elements
Answer: Metals: Li, Be, Na, Mg, Al, K, Ca, Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Zn
Non-metals: H, He, C, N, O, F, Ne, Si, P, S, Cl, Ar
Metalloid: B
Explanation: The first 30 elements are H, He, Li, Be, B, C, N, O, F, Ne, Na,
Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Mn, Fe, Co, Ni, Cu, Zn
Metallic elements are more electropositive (tending to form ions by donating electrons) with fewer electrons in their outer shell
Non-metallic elements are more electronegative (tending to form ions by accepting electrons) with more electrons in their outer shell
Metalloids are elements somewhere between, but without any specific clear boundary between them and metals/non-metals
group1 and group2 elements, with one or two outer electrons, are all metals: Li, Na, K, Be, Mg, Ca
similarly the transition metals 21-30 are all electropositive and metals.
The noble gases He, Ne, Ar are gases that have completed outer shells and are non-metallic, likewise the halogens F, Cl with 7 outer electrons, and O and S with 6 are non-metals. N and P (5 outer electrons) are non-metallic as are C and Si (4 outer electrons).
This leaves H, B, Al. H, with its single electron close to the nucleus is a non- metallic gas. Al (3 outer electrons) is metallic, but B, has its 3 electrons close to the nucleus and has the in-between character of a metalloid.
When force are ____ the object does not move
when forces are balanced the object does not move.
Explanation:
if you and your friend push both sides of the chair at the same time with the same amount of strength the chair wouldn't move.
1. How many moles of Mg are there in 9.20 x 1024 atoms of Mg?
Answer:
15.28 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{9.20 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 15.282392..[/tex]
We have the final answer as
15.28 molesHope this helps you
How would you define what the conductivity of a substance is?
Answer:
Conductivity of a substance is defined as 'the ability or power to conduct or transmit heat, electricity, or sound'.
Explanation:
hope it helps
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What do the colors on the periodic table show?
A. which element it is
B. the metallic properties of the element
C. the types of compounds the element can make
D. whether the element is a solid, a liquid, or a gas at room temperature
Answer:
Periodic tables can use color to identify other element characteristics. For example, an electronegativity periodic table color codes the elements based on how electronegative they are. The valence periodic table uses color to identify the most common valence state for each element.Oct 2, 2019
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The color given to a the elements in periodic table is to characteristics of the elements mainly to identify whether they are solid, gas or liquid. Thus option D is correct.
What is periodic table?A periodic table contains all the discovered elements which are classified into different groups and periods. Groups are vertical columns of elements with similar properties and same number of valence electrons.
Periods are horizontal rows from left to right with an increase in atomic number. There are 18 groups and 7 periods in periodic table. Each group has given each color and some elements showing exceptional characteristics such as hydrogen and helium have separate colors.
All the first group elements called alkali metals have one color and the second groups elements with another color, All the d-block elements are given the same colour and metals in p-block elements have the same color.
Similarly, all the metalloids have one color and all other gases have the same colour in which inert gas group and halogen group have seperate colours.
Hence, the color in periodic table helps to identify the element's nature like its state also. Thus option D is correct.
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What is an acid in Science
Answer :An acid is any hydrogen containing substance
Explanation: i hope it helps i got a little help from a friend
What is the significance of the color of the light observed in a line spectrum?
What conclusion can she make from her experiment?
Heather is testing a substance as to whether it is
organic or inorganic. She works with the solid
substance and discovers it can conduct electricity
without burning. She also knows the carbon to oxygen
ratio is 1 to 2
O The substance is organic because it is solid at room
temperature.
O The substance is organic because it cannot burn
readily
O The substance is inorganic because it has carbon.
The substance is inorganic because it conducts
electricity
Answer:
Im pretty sure the answer is D
Explanation
Answer:
Answer D
Explanation:
The percentage by volume of oxygen in clean and dry air is approximately
Answer:
[tex]\huge\bf\underline{\underline{\pink{A}\orange{N}\red{S}\green{W}\purple{E}\blue{R}}}[/tex]
ONLY 20.95% IN THE AIR
:)
▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃▃
How can we use properties to identify unknown minerals?
Answer:
BY NAMING THE MINERALS :>
Explanation:
Answer:
NAMING THE MINERALS
Explanation:
Choose all that are correct about the elements in the column highlighted in blue
in the periodic table below (there are FOUR correct answers)
Answer:
1. Are Metals
2. Are Solids
3. Are Un-reactive
4. Have 18 valence electrons
Explanation:
In a color coded periodic table of the components, the crate for every component is colored. This tone speaks to the classes of components, which incorporate metals, metalloids and non-metals. All in all, the color blue is used for metals, orange for metalloids and green for non-metals. The periodic table might be further tone coded to incorporate different gatherings, for example, transition metals, rare earths, alkali metals, alkaline earths, halogens and noble gases.
The modern periodic table coordinates components by their nuclear number, which is extraordinary to every component. The nuclear number speaks to the quantity of protons in a particle of the component. In the cutting edge occasional table, the nuclear number increments from left to right and through and through. The occasional table is likewise coordinated into periods and groups. Periods are the rows and groups are the columns. The components in every period start with metals on the left side, at that point move to metalloids and afterward to non-metals on the right. The components contained in each group have comparative actual properties.
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Why is it important to pasteurize certain liquids?
Answer:
Pasteurization involves heating liquids at high temperatures for short amounts of time, it can make it better if you wanted hot cocoa but bad for milk
Explanation:
Answer:
Pasteurization kills harmful microbes in milk without affecting the taste or nutritional value
Explanation:
Please help me !!!!!
Formula for the compound that contains Mg2+ and O2-
Answer:
MgO.
Explanation:
charges of both satisfy one another (balanced) -- producing a compound MgO.
PLZ HELP ASAP THIS IS DUE LIKE RIGHT NOW
Answer:it's either the first or second one
Explanation:
the layers of the earth
About ______ impact the creators have been recognized on earth.
A) one thousand
B) 50
C)500
D)150
The central atom in PbSO4 is..............???????
Answer:
The central atom is S.
Explanation:
Look at the structure.
Typhoons are large storms that form over the Pacific Ocean Hurricanes are large storms that form over the Atlantic Ocean. Which of the following are essential components in the formation of a hurricane
or a lyphoon
A High pressure, high temperature, cyclonic winds, dry air
B. High pressure cool temperature, strong winds, humid air
cWarm front, clouds, low pressure, high slevation
D Low pressure, warm temperature, warm ocean waters, spiraling winds
How long does it take for 87.5 % of each isotope(Krypton-73, Krypton-74, Krypton-76, and Krypton-81) to decay?
Which has a higher frequency: microwaves or blue light? How do you know?
Answer:
Microwaves
Explanation:
Microwaves have more energy than blue light
Among microwaves or blue light, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.
What is the relationship between frequency and wavelength?The frequency of any wave is inversely related to the wavelength. This means that when the frequency of the wave increases, the wavelength decreases. While the relationship between frequency is directly related to the energy.
According to the context of this question, gamma rays have the highest frequency and shorter wavelength, while radiowaves have a shorter frequency and the highest wavelength.
Therefore, blue light has a higher frequency. This is because blue light belongs to the visible region has a short wavelength and produces a higher amount of energy.
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uses of indicators in points?
Answer:
The common application of indicators is the detection of end points of titrations. The colour of an indicator alters when the acidity or the oxidizing strength of the solution, or the concentration of a certain chemical species, reaches a critical range of values.
How many moles in 435 liters of Krypton gas at STP?
19.4 mol Kr
General Formulas and Concepts:Chemistry
Stoichiometry
Using Dimensional AnalysisGas Laws
STP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KMath
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right Explanation:Step 1: Define
435 L Kr at STP
Step 2: Identify Conversions
[STP] 22.4 L = 1 mol
Step 3: Convert
[tex]435 \ L \ Kr(\frac{1 \ mol \ Kr}{22.4 \ L \ Kr} )[/tex] = 19.4196 mol Kr
Step 4: Check
We are given 3 sig figs. Follow sig fig rules and round.
19.4196 mol Kr ≈ 19.4 mol Kr
How many moles of sodium hydroxide are required to react completely with 23.1 moles of sulfuric acid?
H2SO4(aq) + NaOH(aq) = 2H2O(L) + Na2SO4(aq)
Select one:
a. 46.2 moles NaOH
b. 11.6 moles NaOH
c. 5.78 moles NaOH
d. 23.1 moles NaOH
Answer:
46.2 moles of NaOH are required.
Explanation:
Given data:
Moles of NaOH required = ?
Moles of H₂SO₄ = 23.1 mol
Solution:
Chemical equation:
H₂SO₄ + 2NaOH → 2H₂O + Na₂SO₄
Now we will compare the moles of NaOH with H₂SO₄.
H₂SO₄ : NaOH
1 : 2
23.1 : 2×23.1 = 46.2
Thus, 46.2 moles of NaOH are required.
The transfer of energy in the form of invisible waves is
Answer:
Radiation
Explanation:
What kind of bond would form between an iron and an oxygen atom: ionic, covalent, or metallic? What kind of bond would form between two silver atoms: ionic, covalent, or metallic? What happens to the valence electrons in this bond? How do ionization energy and electronegativity help explain why this occurs? 3) What kind of bond would form between two chlorine atoms: ionic, covalent, or metallic? What happens to the valence electrons in this bond? How do ionization energy and electronegativity help explain why this occurs?
Answer:
See explanation
Explanation:
Since iron is a metal and oxygen is a non metal, a bond is formed between the two when electrons are transferred from iron to oxygen. Hence the bond is ionic.
Two silver atoms are held together by metallic bonds. Metallic bond are bond forces that exist between metal atoms in a crystal lattice. The valence electrons in this bond form a cloud. Metals have low ionization energy and low electronegativity hence they loose electrons easily. This accounts for the nature of the metallic bond.
The bond formed between two chlorine atoms is a covalent bond. The valence electrons in this bond are localized between the two chlorine atoms. Chlorine is a nonmetal hence it has a high ionization energy and high electronegativity. Hence it forms covalent bonds in which electrons are shared between bonding atoms.
No help just posting a picture
what makes one of your cells you ?
How do electrons affect the state of an element?
Answer:
Explanation:
All matter is made up of atoms. ... These shells are actually different energy levels and within the energy levels, the electrons orbit the nucleus of the atom. The ground state of an electron, the energy level it normally occupies, is the state of lowest energy for that electron.
ill attach a picture
Answer:
35.50
Explanation:
There are two stable isotopes, 35Cl (75.77%) and 37Cl (24.23%), giving chlorine a standard atomic weight of 35.45