Answer:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Explanation:
In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. ... Groups may also be identified using their topmost element, or have a specific name. For example, group 16 is also described as the "oxygen group" and as the "chalcogens".
(hope this helps ^^)
If a substance has a PH of 7 is it a acid, base or a neutral.
Answer:
Neutral
Explanation:
A pH below 7 is acidic and a pH above 7 is basic, and a pH of 7 is neutral.
If an atom has a diameter of 395 pm,
what is its radius?
Answer:
197.5pm
Explanation:
Given parameters:
Diameter of the atom = 395pm
Unknown:
Radius of the atom =?
Solution:
Radius is the half of diameter;
Radius = [tex]\frac{diameter}{2}[/tex]
Radius = [tex]\frac{395}{2}[/tex] = 197.5pm
Which of the following contains the same number of electrons as an atom of neon?
Cl-
Li
Li+
02
Answer:
D. [tex] O^{2-}[/tex]
Explanation:
In Chemistry, electrons can be defined as subatomic particles that are negatively charged and as such has a magnitude of -1.
Valence electrons can be defined as the number of electrons present in the outermost shell of an atom. Valence electrons are used to determine whether an atom or group of elements found in a periodic table can bond with others. Thus, this property is typically used to determine the chemical properties of elements.
Oxygen has a total number of eight (8) electrons and as such the [tex] O^{2-}[/tex] is able to gain (receive) two (2) more electrons in order to have the same electron arrangements as the noble gas i.e an atom of neon that has a total number of ten (10) electrons.
Hence, [tex] O^{2-}[/tex] contains the same number of electrons as an atom of neon.
will mark BRAINLIEST
Answer:
A and D
Explanation:
explain how a motorcar engine produces nitrogen oxides
Answer: combustion causes a chemical reaction between nitrogen and oxygen in the engine.
Explanation:
Nitrogen oxides are produced in combustion processes, partly from nitrogen compounds in the fuel, but mostly by direct combination of atmospheric oxygen and nitrogen in flames. Nitrogen oxides are produced naturally by lightning, and also, to a small extent, by microbial processes in soils.
Answer:
when fuels are burned in vehicle engines high temperatures are reached. at these high temperature nitrogen and oxygen from the air combine to produce nitrogen
Eliza places an 18-gram piece of an unknown substance into a graduated cylinder that is filled with 5 mL of water, and the water rises from the 5 mL line to the 8 mL. What is the density of the unknown substance in g/mL?
Answer:
6g/mL
Explanation:
Given parameters;
Mass of the unknown substance = 18g
Volume of water before the mass is introduced = 5mL
Volume of water after the mass is introduced = 8mL
Unknown:
Density of the mass = ?
Solution:
Density is the mass per unit volume of a substance.
Density = [tex]\frac{mass}{volume}[/tex]
Mass is the amount of matter in a substance
Volume is the space occupied by a body
Volume of the body = 8mL - 5mL = 3mL
Insert the parameters and solve;
Density = [tex]\frac{18g}{3mL}[/tex] = 6g/mL
Answer:
I think its 6g or 16g but im pretty sure its 6g
Explanation:
Which has kinetic energy?
Ob
a tank of gasoline
a moving car
a battery
Ос
Od
water in a reservoir
Answer:
a moving car
Explanation:
because The faster an object is moving, the more kinetic energy it has. Any object that is moving has kinetic energy – the moving object has energy because of its motion.
Construct the chemical formulas for the ionic compounds.
Ionic compounds are formed from metal and non-metal elements
Further explanationThe chemical formula of compounds (especially ionic compounds) can be determined from the charge of each ion.
Determination of the ionic charge of the constituent elements of the compound can be seen from the electron configuration to achieve stability according to the octet rule
The charge of each ion will be crossed in the compound
Aluminum bromide
Al³⁺ + Br⁻ ⇒ AlBr₃
Magnesium bromide
Mg²⁺ + Br⁻ ⇒ MgBr₂
Sodium sulfide
Na⁺ + S²⁻ ⇒ Na₂S
Sodium nitride
Na⁺ + N³⁻ ⇒ Na₃N
Which of the following is the best hypothesis?
O A. Why does salt water boil at a higher temperature than
pure water?
O B. Americans use too much salt when they cook.
O C. If I add salt to water, it will cause the boiling point to increase.
D. It's better to cook pasta in salt water than in pure water.
compare the size of F- and Na+ with atomic size of Neon?
Fluorine's atomic configuration is (2,7). As it's charge is -1, it will have 8 electrons in it's outermost shell thus filling its octate. similarly, Sodium loses one electron.
There you go :)
The mixture and elements of Coffee w Cream and Sugar
Which of the following is a difference between naming ionic and covalent compounds?
Group of answer choices
In ionic compounds the ending of the second element changes to -ide, but not in covalent compounds.
In covalent compounds, the prefix of the first element is always ignored but the prefix in the second element depends on the subscript of the element. In ionic compounds, the subscript on each element does not affect the name of the compound.
In covalent compounds the ending of the second element changes to -ide, but not in ionic compounds.
In covalent compounds, the prefix of the first element and second element depends on the subscript of each element. In ionic compounds, the subscript on each element does not affect the name of the compound.
The difference between naming ionic and covalent compounds is that, in ionic compounds the ending of the second element changes to -ide, but not in covalent compounds.
Ionic compounds are compounds that are formed by the by the transfer of electrons from a metal to a nonmetal. Covalent compounds are formed when electrons are shared between nonmetals.
For ionic compounds, the name of the second element(the nonmetal) often ends in -ide. For instance; sodium bromide, cesium oxide and potassium nitride. This does not apply when naming covalent compounds. The are named based on the subscripts of each element in the compound.
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How to do this question plz answer me
Answer:
dissolved
Explanation:
The figure shows sodium chloride is in solution. It gets that way by being dissolved.
Scientists believe that the earth's core is:
what are two ways in which you can increase the potential energy of a marble on ramp
Answer:
You can make the ramp really steep and hold the marble at the top of it
Explanation:
The statement of two ways in which increase the potential energy that is "potential energy is declining, while its kinetic energy is rising. Due to friction, potential energy is also transformed into heat."
What is potential energy?Potential energy is the energy stored in an object due to its location relative to some zero position, that objects can be compressed such as rubber bands, trampolines, and bungee cords are examples of potential energy.
A marble dropped at the top of the ramp seems to have more gravitational force than one discharged further down the ramp, and that potential energy is turned into kinetic energy when the marble is again dropped and begins to roll down the ramp.
Learn more about potential energy here
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yo, i need help. 25 points and brainliest. :|
Answer:
here's your answer...
Explanation:
Full moon, also hey lol.
have a germ-free day.
How are the atomic number and the number of protons related to each other?
describe how metamorphic rocks are formed by heat and pressure
Answer:
Metamorphic rocks form when heat and pressure transform an existing rock into a new rock. Contact metamorphism occurs when hot magma transforms rock that it contacts. Regional metamorphism transforms large areas of existing rocks under the tremendous heat and pressure created by tectonic forces.
Explanation:
Potato strips placed in a container of concentrated salt water will ultimately __.
Can someone help? Ill give brainliest!
Directions: count each side of the reaction then Circle yes or no if it follows the law of conservation of mass
Answer:
Explanation:
before the reaction you have K=2 and Cl=4
after the reaction K=2 and Cl=2 so it does not follow the law of conservation
An example of a physical property of an element is the element's ability to what?
Explanation:
Appearance, melting point, density, solubility, polarity
6th grade science i mark as brainliest
Describe the chemical makeup of DNA. (site 1)
Answer:
DNA, or Deoxyribonucleic acid, has three types of chemical component: phosphates, a sugar known as deoxyribose, and four nitrogenous bases which are:
-adenine
-guanine
-cytosine
-thymine.
Two of the bases, adenine and guanine, have a double-ring structure characteristic of a type of chemical called a purine.
Hope this helped,
Philip
Brainliest always appreciated! <3
If 9.6 X 1021 molecules of hydrogen are reacted with excess nitrogen, how many liters of ammonia can be produced at STP?
The volume of NH₃ produced at STP : 0.237 L
Further explanationReaction
N₂ + 3H₂ → 2NH₃
1 mol = 6.02 x 10²³ particles
9.6 X 10²¹ molecules of Hydrogen, mol :
[tex]\tt \dfrac{9.61\times 10^{21}}{6.02\times 10^{23}}=1.596\times 10^{-2}~moles[/tex]
mol H₂ : mol NH₃ = 3 : 2
mol NH₃ :
[tex]\tt \dfrac{2}{3}\times 1.596\times 10^{-2}=0.0106[/tex]
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.
The volume of NH₃ :
[tex]\tt 0.0106\times 22.4=0.237~L[/tex]
CO2(g) +H2(g)------>CO(g) + H2O(/)
What is being oxidized?
Carbon
Carbon Dioxide
Oxygen
Hydrogen
Answer:
Srry its so hard
Explanation:
The specific heat capacity of a certain type of cooking oil is 1.75 J/(g⋅∘C). What is the amount of heat exchanged when the temperature of 2.76 kg of this oil is cooled from 191∘C to 23 ∘C?
Answer:
Q = -811440 J
Explanation:
Given data:
Mass of oil = 2.76 Kg (2.76× 1000 = 2760 g)
Initial temperature = 191 °C
Final temperature = 23°C
Specific heat capacity of oil = 1.75 J/g.°C
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 23°C - 191 °C
ΔT = -168°C
Q = 2760 g ×1.75 J/g.°C ×-168°C
Q = -811440 J
Negative sign show heat is released.
List and define the 3 parts of a chemical equation (R->P).
Answer:
R- reactants
arrow- yields
p- products
Explanation:
Which observation is the best indication that a chemical reaction has occurred?
A. Change in temperature
B. Presence of ashes
C. Change from liquid to gas
D. Absence of fizzing
Answer:
B: Presence of ashes
Explanation:
Burning molecules turns them into other molecules
Answer:B
Explanation:
mass density and volume of molasses
Answer:
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Explanation:
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