Answer:
Sharing of electrons such that each atom attains an octet
I NEED HELP!! PLEASE
what is the predicted order of electronegativity values from least to greatest for elements in the second period?
A. li b>n>f
B. c b>n>f
D. there is no way to predict
Susana heats up a sample of red crystals. While the sample is being heated,a gas is released and a blue powder is left after heating. Is the sample of red crystals an element or compound?
Answer & Explanation:
Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.
Answer:
Susana's red crystal sample is a compound because it was broken down into a gas and blue powder. It is not an element because elements cannot be broken down into simpler substances by ordinary means, such as heating.
Explanation
Sample response form Edg
The gram-formula-weight for U205 is __________ g/mol.
Group of answer choices
Answer:
556g/mol
Explanation:
The gram formula-weight for U₂O₅ is the molar mass of a compound. It is determined by adding the atomic masses of the component and then expressed in grams.
Atomic mass of U = 238g/mol
Atomic mass of O = 16g/mol
gram formula-weight for U₂O₅ = 2(238) + 5(16) = 556g/mol
What is the difference between the substances represented by the symbols Co and CO
Answer:
Be careful about when to use capital letters. For example, CO means a molecule of carbon monoxide but Co is the symbol for cobalt
Explanation:
Which type of bond shares the electrons between two elements?
Answer:
Covalent Bonds
General Formulas and Concepts:
Different types of bondsExplanation:
We have 3 types of bonds: Polar Covalent, Nonpolar Covalent, and Ionic bonds.
Nonpolar Covalent bonds share the electrons equally between the compound.
Polar Covalent bonds do NOT share the electrons equally, but STILL SHARE the electrons; the electron tends to stay with the element with the stronger electron affinity and thus creates dipoles.
Ionic bonds DO NOT share electrons. The electrons are transferred to the respective elements.
When the potential difference across a lamp is 3.3V the current is 0.15 calculate the resistance of the lamp and give the unit
Answer:
22Ω
Explanation:
Given parameters:
Potential difference = 3.3V
Current = 0.15A
Unknown:
Resistance = ?
Solution:
According to ohm's law, potential difference, current and resistance are related by the expression below;
V = I R
where V is the voltage
I is the current
R is the resistance
3.3 = 0.15 x R
R = [tex]\frac{3.3}{0.15}[/tex] = 22Ω
Sonja and Jeremy performed several experiments to show how changes in temperature affected the volume of an inflated balloon. They made sure the pressure stayed the same. They also showed the effects of pressure on volume if temperature stayed the same. They organized their information in this table. Which experiments provide evidence for Boyle’s law?
Answer:
They also showed the effects of pressure on volume if temperature stayed the same
Explanation:
They also showed the effects of pressure on volume if temperature stayed the same is the experiment that will provide an evidence for Boyle's law.
Boyle's law states that "the volume of a fixed mass of a gas varies inversely as the pressure changes, if the temperature is constant".
The law is an affirmation of what happens when there is a dynamics between pressure and volume if temperature is made constant. So the experiment designed to investigate this proves and shows Boyle's law.Please help. It's for chemistry
How many protons are in the nucleus of one atom of neon based on this information found in the Periodic Table?
Answer:
10 protons
Explanation:
The atomic number of an element is equal to the number of protons of the element. The atomic number of neon is 10. Therefore, neon contains 10 protons.
10 protons are in the nucleus of one atom of neon based on this information found in the Periodic Table.
What is periodic table ?The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements. It is frequently used in physics, chemistry, and other disciplines and is frequently regarded as a symbol of chemistry.
The elements are organized in what is known as the periodic table. Columns and rows are used to organize the table. The horizontal rows are referred to as "periods," while the vertical columns are known as "groups."
Thus, The atomic number of an element is similar to the number of protons of the element. The atomic number of an element neon is 10. So, neon contains 10 protons.
To learn more about the periodic table, follow the link;
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How glycerin is form?
A flask that weighs 450 g is filled with 145 ml of benzene. The weight of the flask and benzene is found to be 754 g. From this information, calculate the density of the benzene.
Answer:
Density, [tex]d=2.09\ g/cm^3[/tex]
Explanation:
Given that,
Mass of a flask is 450 g
Volume of benzene added to the flask is 145 mL or 145 cm³
The weight of the flask and benzene is found to be 754 g.
We need to find the density of the benzene.
Weight of benzene added = total weight of flask and benzene-mass of flask
m = 754 g - 450 g
m = 304 g
Density = mass/volume
So,
[tex]d=\dfrac{304\ g}{145\ cm^3}\\\\d=2.09\ g/cm^3[/tex]
So, the density of the benzene is [tex]2.09\ g/cm^3[/tex].
Please hurry i really need it fast
The answers are here
In which figure does Colin do work?
A. Figure A
B. Figure B
C. Both figures
D. Neither figure
predict the formula for a compound containing carbon (C) and chlorine (Cl)
Answer:
Carbon has a valency of+4 and chlorine has a valency equal to −1.Compound is Carbon tetrachloride CCl4.
HELP PLEASE
all charged objects create an electric field around them. what two factors determine the strength of two electric fields upon the charged objects creating them?
1) how charged the object creating the field is and the density of the charged objects
2) how charged the object creating the field is and weather the objects are positively or negatively charged
3) how charged the object creating the field is and the mass of the two charged objects
4) how charged the object creating the field is and the distance between the two charged objects
Answer:
4) how charged the object creating the field is and the distance between the two charged objects
How many moles of acetaminophen are in a 0.8mL (0.0008L) dose of infants Tylenol
Answer:
0.007 mol
Explanation:
Step 1: Given data
Volume of acetaminophen: 0.8 mL
Step 2: Calculate the mass corresponding to 0.8 mL of acetaminophen
The density of acetaminophen is 1.26 g/mL.
0.8 mL × (1.26 g/mL) = 1 g
Step 3: Calculate the number of moles corresponding to 1 g of acetaminophen
The molar mass of acetaminophen is 151.16 g/mol.
1 g × (1 mol/151.16 g) = 0.007 mol
What is the electron configuration for boron (B)?
Answer:
[He]2s2 2p1.
that is the answer have an amazing day. Remember your an amazing person for who you are.
explain the economic features of gandaki province
Answer:
there are many valleys and mountain in this region
magar,gurung,brahmins are the main inhabitants of this province
there is possibility of tourism development in this province
production of apple in mountains and coffe in hilly has made this region popular .
Hope it helps
Answer:
There are many valleys and mountain in this region . Magar, Gurung, and Brahmins are the main inhabitants of this province . There is possibility of tourism development in this province . Production of apple in mountains and coffee in hilly has made this region popular.
Explanation:
May I have brainliest please? :)
PLEASE HELP WITH CHEMISTRY !! WILL GIVE BRAINLIEST AND 10 POINTS
Wavelength = 6.25 x 10⁻¹⁰ m
Energy=3.1805 x 10⁻¹⁶ 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
f = c / λ
c = speed of light
= 3.10⁸
λ = wavelength
Frequency : 4.8 x 10¹⁷ /s
the wavelength :
[tex]\tt \lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3.10^8}{4.8.10^{17}}=6.25\times 10^{-10}~m[/tex]
Energy :
[tex]\tt E=6.626.10^{-34}\times 4.8\times 10^{17}=3.1805\times 10^{-16}~J[/tex]
Sorry,for table 3 , I can't find it
You have a 155-g sample of Al2O3. If there are 22.5 g of Al in the solution, what is the percent by mass of the solute? Use details to support your answer.
Answer:
14.52%
Explanation:
The percentage by mass (WW%) is calculated by using the formula:
Mass of solute/mass of solution ×
100
The solute (Al) is 22.5g while the solvent (Al2O3) is 155g
Hence, percent by mass is:
22.5/155 × 100
= 0.1452 × 100
= 14.52%
What is the empirical formula for N2H6
Answer:
NH4
Explanation:
empirical formula is the ratio of all elements to each other. so
2:6= 1:4
that's why
N1H4 or NH4
write the number 3000,000,000 in scientific notation
Answer:
3 x 10^9
Explanation:
In going down a group in the periodic table, what effect does electron shielding generally have on the effective nuclear
charge acting on the outermost electron in an atom?
Answer: Electron shielding has little effect on the effective nuclear charge because electrons are being added to principal energy levels, not to any inner levels. As the nuclear charge increases across a period, the effective nuclear charge acting on the outermost electrons increases.
Explanation:
Down a group in periodic table, the number of electron in an atom increases. Therefore, the shielding of an electron from the nuclear charge by neighbouring electrons increases which further reduces the ionization energy.
What is ionization energy?Ionization energy is the minimum amount of energy required to remove the loosely bound electron from the valence shell of the atom. From the left to right in a row in periodic table the ionization energy increases and down a group it decreases.
Metals in left side of periodic table are electron rich and easily loss electrons because, the valence electrons in them are loosely bout due to less effective nuclear pulling.
The less the nuclear pulling to the electrons the less electronegative the atom is. The electrons can shield each other from the nuclear attractive pulling. Hence, down a group as the number of electrons increases, this shielding or screening effect also increases results in less nuclear charge to the valence electron.
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Which of the following statements about biodiversity is true? a. Changes to biodiversity always positively affect an ecosystem. b. Changes to biodiversity always negatively affect an ecosystem. c. Changes to biodiversity can positively and negatively affect on an ecosystem. d. Changes to biodiversity never affect an ecosystem.
Answer:
I believe C
Explanation:
Saying it always does one thing or another is mostly not the case. When it comes to biodiversity, there can be positive impacts! But an ecosystem is affected by everything in it's biodiversity.
send help thank u asap
Answer:
The Answer is ________ Please Make sure You Put it In and Trust Have a wonderful day/Night:)
Explanation:
Answer:
3 is B 4 is the number 3
Explanation:
I hope this helps :D
Which of the following geographical features acted as a natural defense for Egypt against enemies from the south? A. the Nubian desert B. the Mediterranean Sea C. the cataracts of the Nile D. the black silt on the river banks Please select the best answer from the choices provided A B C D
Answer:
C
Explanation:
The geographical features acted as a natural defense for Egypt against enemies from the south is cataracts of Nile. Hence, option C is correct.
What is cataracts of Nile ?The Nile River, one of Egypt's most notable natural features, was the envy of neighboring civilizations and allowed the Egyptians maintain contact with populations in the Mediterranean region.
Huge deserts extend well beyond the lush terrain that surrounds the Nile River on both sides. The Sahara Desert, the world's biggest desert, is to the west. More desert and the Red Sea may be found east of the Nile. These deserts served as an excellent natural defense against invaders.
The Egyptians had built-in fortifications thanks to the river and the desert. The delta of the Nile River is swampy. Egypt was unable to construct a port at the mouth of the Nile as a result. Invaders found it hard to approach Egyptian villages along the river as a result.
Find more on Nile river:
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A student wants to make a fair comparison of the reactivity of the metals with
hydrochloric acid.
Name two variables that must be kept constant.
Answer:
the concentration of hydrochloric acid
the temperature in heating
What is the total amount of heat required to completely vaporize a 100.0 g of
water at its normal boiling point?
Work too pls !!
The total amount of heat : 225.704 kJ
Further explanationHeat of vaporization(ΔH vap) : heat needed to vaporize 1 mole of water , units : kJ/mol
For water at boiling point (100 °C) : ΔH vap = 40.66 kj/mol
mole of 100 g water :
[tex]\tt \dfrac{100}{18.015}=5.551[/tex]
so total Heat :
[tex]\tt 40.66\times 5.551=225.704~kJ[/tex]
Based on the scientific sources you found, did you think one person’s points were more scientifically valid than the other’s
Answer:
Yes. The scientific sources disputed several of the fitness instructor’s points. For example, he mentioned that GMO foods cause food allergies, but two credible sources disputed this claim. The lab technician, however, supported her findings with verifiable scientific information.
Explanation: plato
I'm confused what valence electrons are ? idk if they're the same as just regular electrons
Answer: valence electrons are simply the electrons in the outer most ring of the chart. in your example, this atom has four valence electrons.
What is the temperature of a gas at STP?
O A. 273 K
O B. 273°C
ОС. ОК
O D. -273°C
Answer:
The temperature of a gas at STP is 273K
