Except for helium, all the elements in the last column of the periodic table have
valence electrons.
0 7
0 8
О О
O 18
Answer:
O
Explanation:
they have O valence electrons
Which best describes the data?
Answer:
The average?
Explanation:
Please pray for healing and my name is Fairouz
Answer:
I hope everything gets better
Explanation:
Answer:
I hope you are better now
what will happen to the speed of sound if you sing your favorite song during a cold day?
Answer:
The speed will decrease5) How do you describe a person who likes
inventing stories?
Plz Help ;_; :v
Answer:
One word for this is, raconteur - it means a person skilled in telling anecdotes. anecdotist. narrator, or storyteller
Explanation:
2. Which part of the scientific method involves making an educated guess?
Conclusion
hypotheisis
experiment
Resulsts
Answer:
The part of the scientific method that involves making an educated guess is the "hypothesis".
Explanation:
When measuring the volume of a liquid, why is it best to use a measuring container that is narrow?
Answer:
n the sciences, the “tools” for measuring the volumes of liquids are generally made from glass, plastic or occasionally metal, although professionals referred to all of them as “glassware.” Scientists, and chemists in particular, have a variety of glassware at their disposal for measuring volumes. The particular piece of glassware chosen in any situation will depend primarily upon two factors: the required volume and the accuracy required for the measurement.
Explanation:
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Bond the following atoms. Determine if they are ionic or covalent, circle your choice. Show the valence electrons and how they are either shared between the atoms or how they are transferred between atoms. Then write the chemical formula in the space provided.
Ionic or covalent
C Cl
Formula ____________ Ionic or covalent
Mg Cl
Formula _____________
C Cl is a covalently bonded compound with the formula CCl₄. MgCl is an ionic compound with the formula MgCl₂.
What is meant by chemical bonding?The formation of a chemical bond between two or more atoms, ions or molecules to form a chemical compound is known as chemical bonding. The chemical bonding makes sure the atoms are together in the resulting compound.
Chemical bonding is made possible by an attractive force resulting from the overall loss of energy in the resultant molecule compared to its constituents.
Chemical compounds depend on chemical bonding for their stability. There are various kinds of chemical bonds formed. Covalent bonds and ionic bonds are 2 of the most commonly known chemical bonds.
Covalent bonds are formed by the sharing of electrons and an ionic bond is formed by the electrostatic force of attraction between the atoms.
Therefore, in the given examples, C Cl is a covalently bonded compound with the formula CCl₄. MgCl is an ionic compound with the formula MgCl₂.
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The bond of the following atoms in C-Cl and Mg-Cl is polar covalent bond in C-Cl and Mg-Cl ionic bond.
What is polar covalent and ionic bond?Polar covalent bonds are created between two non-metal atoms or molecules that do consist of different electronegativity. and the electronegativity difference that is not equal to zero and the shared pair of electrons forming a bond between will always be towards the high electronegative atom.
An ionic bond the complete sharing or the electron transfer. Ionic bonds basically form or created when the difference in the electronegativity of the two atoms is great or more as compare to covalent bonds form when the electronegativity is same.
Therefore, bond of the following atoms in C-Cl and Mg-Cl is polar covalent bond in C-Cl and Mg-Cl ionic bond.
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Water is a pure substance. Which of the following is true about water?
a
A chemical change is required to separate the elements present in it.
b
A physical change is required to separate the elements present in it.
c
It is made up of two compounds, each with a different set of atoms.
d
It is made up of an element and a compound.
Answer:
A chemical change is required to separate the elements present in it.
Explanation:
The only true statement from the choices given is that water as a pure substance requires a chemical change to separate the elements present in it.
Water is a molecule consist of two atoms of hydrogen and one atom of oxygen.
The atoms are covalently bonded together. A chemical process, the electrolysis of water is often used to separate the atoms of a water. Physical changes cannot be used to separate the atoms of water. Water is a compound which consists of two elements.Therefore, we see that only the first choice satisfies this problem.
What is the purpose of this material in the nucleus?*
O
makes antibodies
DNA makes protein molecules to help with almost every cellular process.
о
DNA makes super molecules to help with almost every cellular process.
to make concrete
Answer: DNA makes protein molecules to help with almost every cellular process.
i think?
Which statement best describes John Dalton’s use of creativity in his work?
Answer:A
Explanation:
On ed2020
The amount of gravitational force between objects depends on their...
O Masses and the distance between them
O Masses and the frictional forces between them
O Speed and direction of motion
O Speed and the distance between the masses
Answer:
mass and distance between them
Hydrogen’s emission spectrum includes a line of violet light that has a frequency of 7.31 x 1014 Hz. What is the energy (in joules) a photon of the violet light?
Select one:
a. 4.85 x 1019 J
b. 1.10 x 10-48 J
c. 9.06 x 10-49 J
d. 4.84 x 10-19 J
Answer:
Option D. 4.85×10¯¹⁹ J
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 7.31×10¹⁴ Hz.
Energy (E) =?
The energy of the photon of violet light can be obtained by using the following formula
E = hf
Where:
E is the energy.
h is the Planck's constant
F is the frequency.
Frequency (f) = 7.31×10¹⁴ Hz.
Planck's constant (h) = 6.63×10¯³⁴ Js
Energy (E) =..?
E = hf
E = 6.63×10¯³⁴ × 7.31×10¹⁴ Hz.
E = 4.85×10¯¹⁹ J
Therefore, the energy of the photon of the violent light is 4.85×10¯¹⁹ J
20 Points!! 10 Each Points Please Help ASAP!! View Attached Image!! Will Mark Brainliest If All Are Answered!!
Answer:
1.a 2.d 3.c 4.b
Explanation:
Answer:
18.B
19.B
20.D
21.A
Explanation:
what is the mass of 80.0mL of ethanol at 20 degress celcius
Answer: What is the mass, in grams, of 135 mL of ethanol? d=0.789 g/mL - the ethanol density. V=135 mL - the volume of ethanol. m=0.789g/mL*135mL=106.515g ~ 106.5g- the mass of ethanol.
Explanation:
Hope this helps :)
what frequency does television channel 7 broadcast at?
Answer:
Channel 7's frequency is 117.5 MHz
Answer:
174 MHz - 180 MHz w/ center frequency of 177 MHz
Explanation:
216 - 174 = 42
42/7 = 6
6 + 174 = 180 - 7 - 177 MHz
180 + 6 = 186 - 8 - 183 MHz
186 + 6 = 192 - 9 - 189 MHz
192 + 6 = 198 - 10 - 195 MHz
198 + 6 = 204 - 11 - 201 MHz
204 + 6 = 210 - 12 - 207 MHz
210 + 6 = 216 - 13 - 213 MHz
When hit from behind in a car crash, a passenger can suffer a
neck injury of whiplash. This is an example of Newton's
law,
Answer:
Neck injury, and back injury
Explain how nuclear and chemical reactions differ in terms of how they are balanced. (PLEASE ANSWER ASAP THIS NEEDS TO BE TURNED IN SOON)
Explanation:
(1) Nuclear reactions involve a change in an atom's nucleus, usually producing a different element. Chemical reactions, on the other hand, involve only a rearrangement of electrons and do not involve changes in the nuclei. ... (3) Rates of chemical reactions are influenced by temperature and catalysts.
Which argument is correct about the growth of an organism?
Only genetic factors affect the growth of an organism.
Only genetic factors affect the growth of an organism.
Only environmental factors affect the growth of an organism.
Only environmental factors affect the growth of an organism.
The combination of genes and environmental factors affects the growth of an organism.
The combination of genes and environmental factors affects the growth of an organism.
Genes remove the environmental factors that affect the growth of an organism.
Genes remove the environmental factors that affect the growth of an organism.
Answer: The combination of genes and environmental factors affects the growth of an organism.
Explanation:
Gene consists of DNA and it's heredity physical and functional unit. Genes play a vital role in a organisms growth. For example in humans, if one's parents are tall, there's a large tendency that such child will be tall and vice versa.
Environmental temperature also affects growth of living organisms. These include water soil pH, temperature, gender, chemicals etc. These all affects growth, it should be noted that proteins in living organisms can be damaged at a certain temperature which invariably affects the growth of such organism.
Also, the environment influences gene expressions as temperature, light, drugs, and chemicals, affects genes as they determine which ones will either be turned on or off which will further lead to how such organism grows.
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Which particle matters the most when it comes to stable atom protons or neutrons?
Answer:
Protons
Explanation:
Protons are worth 1, while neutrons are neutral and are worth zero.
How many atoms are in 1.9 g C? Answer in units of atoms.
Answer:
9.5E22
Explanation:
(1.9/12.011)×6.02E23
why is it important for a measurement system to have an international standard ?
Answer:
Mark me brainliest
Explanation:
Standards help avoid confusion and ambiguity when taking measurements. For example, a meter will always be the same length, no matter who is taking the measurement or where it is being taken.
As a result of the reaction of 109.5 grams of a solution of hydrochloric acid with an excess of zinc, a gas with a volume of 3.36 litres Was released. Calculate the mass fraction of hydrochloric acid in the original solution
Explanation:
Volume of gas produced = 3.36 L
as molar volume of gas at STP is 22.4 L
so
no of moles of H2 = 3.36 ÷ 22.4 = 0.15 mole
from balanced reaction equation
Zn + 2HCl = ZnCl2 + H2
Ratio of no of moles between H2 : HCl is 1:2
as H2 moles = 0.15 mole
so
HCl moles reacted = 0.15 × 2 = 0.3 mole
as HCl molar mass = 1 + 35.5 = 36.5 g/mole
so Mass of 0.3 mole of HCl = 0.3 × 36.5 = 10.85 gram
fraction of HCl in Solution
= 10.85 ÷ 109.5 = 0.1
0.1 ×100 so HCl is 10% of solution mass
What is the primary type of heat transfer?: A cool breeze blows off the water.
Answer:
Explanation:
Heat transfer occurs by three main mechanisms: conduction, where rigorously vibrating molecules transfer their energy to other molecules with lower energy; convection, in which the bulk movement of a fluid causes currents and eddies that promote mixing and the distribution of thermal energy
Calculate the heat that must be supplied to
a 532 , stainless steel vessel containing 375 g
of water to raise its temperature from 35 C
to the boiling point of water 100°C. Cs. =0.51 J/g. degrees C
Answer in units of J.
Also what percentage of the heat is used to raise the temperature of the water?
Answer:
Q must be supplied = 119523.3~J
Explanation:
The law of conservation of energy can be applied to heat changes, i.e. the heat received/absorbed is the same as the heat released
Q in = Q out
Heat can be calculated using the formula:
Q = mc∆T
Q = heat, J
m = mass, g
c = specific heat, joules / g ° C
∆T = temperature difference, ° C / K
So from the question :
Q to the system(Q supplied) = Q water + Q steel vessel(Q gained)
5. How many elements do we have in Octane?
5 elements
2 elements
20 elements
26 elements
Answer:
2 elements
Explanation:
Octane is composed of carbon and hydrogen atoms.
How would you record the length of an object?
Answer:
a ruler
Explanation:
Forensic psychiatry focuses on the relationship between human behavior and criminal justice.
O True
O False
The density of a gas is 0.68 g/mL. What amount of space would 23.8 g of this gas occupy