Answer:
Counting individuals
Explanation: just did the quiz A.P.E.X.
Which answer is an isotope of 40/20x?
Question Pictured here:
An isotope of ₂₀⁴⁰X ⇒₂₀⁴⁴X
Further explanationThe elements in nature have several types of isotopes
Isotopes are atoms that have the same number of protons and a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
In the following element notation,
[tex]\large {{{A} \atop {Z}} \right X}[/tex]
X = symbol of elemental atom
A = mass number
= number of protons + number of neutrons
Z = atomic number
= number of protons = number of electrons, on neutral elements
For symbol of isotope X :
₂₀X⁴⁰ : atomic number = 20, mass number = 40
A. ₄₀²⁰X : atomic number = 40, mass number = 20, neutrons=20
B. ₂₀⁴⁰X²⁺ : atomic number = 20, mass number = 40, neutrons=20
C. ₂₁⁴⁰X : atomic number = 21, mass number = 40, neutrons=19
D. ₂₀⁴⁴X : atomic number = 20, mass number = 44, neutrons=22
true or false/Air masses are responsible for the weather in a region
Answer:
False
Explanation:
The air masses are not responsible for weather , it is cause by the Earth evolution
How many atoms should be present at the end of the reaction ?
What is the difference between a conductor and an insulator?
A) An insulator allows electricity to flow through it easily and a conductor does not
B) A conductor allows electricity to flow through it easily and an insulator does not.
C) An insulator is magnetic and a conductor is not
D) A conductor is magnetic and an insulator is not
Answer:
A conductor allows electricity or heat to flow through it easily and an insulator does not.
Explanation:
The difference between a conductor and an insulator is a conductor allows electricity to flow through it easily and an insulator does not.
What is conductor?A conductor is a material that conducts electricity. Most metals are good conductors. The best conductors are single element materials such as copper(Cu), silver(Ag), gold(Au), which are characterized by atoms with only one valence electron very loosely bound to the atom. What is an insulator?A material that does not easily transmit energy such as electric current or heat is called insulators. All materials contain electrons. The electrons in insulators like rubber are not free to move. They are tightly bound inside atoms.Hence, we can conclude that option B is the correct answer.
To learn more about conductor and insulator here
https://brainly.com/question/20102785
#SPJ2
how does the main function of the nervous system help the body react to internal and external stimuli??
The reaction 2KBr(s) →+ Br2(l) + 2K(s) is a
Decomposition reaction
Answer: True
Explanation:
I'm not sure if this was the question.
how do i tell someone how i feel?
An ion of calcium has a charge of 2+. The ion contains 18 electrons. How many protons does a neutral atom of calcium possess?
18
20
36
2
2
Answer:
Explanation:
The ion and the neutral atom both contain 20 protons. Generally the protons stay in the nucleus forever.
A student found a pretty rock while hiking with her family. She discovered
that the rock will scratch glass, but not her steel knife.
Mohs Hardness Scale
Take
Gypsum
5
Apatite
6
Orthoclase
Caleite
Fluorite
7
Quartz
8
Topaz
9
10
Corundum Diamond
finger nail penny
glass knife
According to the Mohs Hardness Scale shown above, what does the
student know about the rock? (6.6C, 6.2E)
F. It is harder than quartz, but softer than topaz.
G. It is harder than fluorite, but softer than quartz.
H. It is harder than calcite, but softer than fluorite.
Answer:
If the rock can't scratch a knife, but glass, it's a 7-10 (Hard Rock)
It's between Quartz and Topaz.
So the answer is,
F.1. Part A: Use the periodic table to order the following Period 3 elements from smallest to largest atomic radius: aluminum (Al), sulfur (S), and chlorine (Cl). Choose the appropriate order from the options below:
From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.
The periodic table has been the arrangement of the elements with increasing atomic numbers and similarities. The elements comprising of the same valence electrons are arranged in the same group.
In the periodic table, on moving down the group there has been the atomic size has been increased with the increase in the shell on each period. The increase in the electrons in the same shell results in the increase in the attraction force and thus, the atomic size decreases across the period.
From the arrangement in the periodic table, the increasing order of the atomic radius is Chlorine < Sulfur < Aluminum.
For more information about the atomic radius, refer to the link:
https://brainly.com/question/9629555
Which element’s atoms have the greatest average number of neutrons?
Answer:
not sure but i guess it's Tellurium
what is the density of a block marble that occupies 255 cm^3 and has a mass of 1000g
Answer:
3.92 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question we have
[tex]density = \frac{1000}{255} \\ = 3.921568...[/tex]
We have the final answer as
3.92 g/cm³Hope this helps you
What is the cathode of a galvanic cell made with magnesium and gold?
OA. Magnesium ions
O B. Gold ions
C. The magnesium electrode
D D. The gold electrode
Answer:
The cathode of a spontaneous electrochemical cell is the cell in which metal cations undergo reduction. The electrons are supplied by the anode. Without much thought, we can conclude magnesium is much less favorably reduced than gold.
The branch of science which deals with chemicals is called chemistry.
The correct option to the question is B.
The system in which the compound is breakdown into its ionic components is called a galvanic cell. In this cell there are two rods, These rodes are as follows:-
AnodeCathodeIn the given question, the cathode is the rode in which electrons enter into the galvanic cell. The cathode is defined as the negatively charged rode.
Hence, the correct option is B that is gold ions.
For more information, refer to the link:-https://brainly.com/question/25026730
Report writing about air pollution ! Thx if u answered ‼️
Answer:
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog. Air pollution is the presence of substances in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. There are different types of air pollutants, such as gases, particulates, and biological molecules. Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires. Air pollution can also cause headaches, dizziness, and nausea. ... Long-term health effects from air pollution include heart disease, lung cancer, and respiratory diseases such as emphysema. Air pollution can also cause long-term damage to people's nerves, brain, kidneys, liver, and other organs. The most basic solution for air pollution is to move away from fossil fuels, replacing them with alternative energies like solar, wind and geothermal. Producing clean energy is crucial. But equally important is to reduce our consumption of energy by adopting responsible habits and using more efficient devices.
Its sad of what our world has become
8 sentence paragraph:
Air pollution is a mixture of solid particles and gases in the air. Car emissions, chemicals from factories, dust, pollen, and mold spores may be suspended as particles. Ozone, a gas, is a major part of air pollution in cities. When ozone forms air pollution, it's also called smog. Some air pollutants are poisonous. Inhaling them can increase the chance you'll have health problems. People with heart or lung disease, older adults, and children are at greater risk from air pollution. Air pollution isn't just outside like the air inside buildings can also be polluted and affect your health.
Which of the following represents a type of change (physical or chemical) that is different from the rest?
a
Setting an inflated balloon on fire
b
Stretching a balloon before blowing air into it
c
Deflating a balloon by releasing all the air present in it
d
Twisting a long balloon to change its shape to form a flower
Answer:
a
Explanation:
The atom of an element S has a mass number of 88 and contains in its nucleus 12 neutrons more than protons. What is the electronic structure:
a) of the atom
b) The S2 + ion that it forms
Answer:
Explanation:
Mass number = No of neutrons + no of protons
Let no of protons be p , No of neutrons = p + 12
Putting the given values
88 = p + 12 + p
76 = 2p
p = 38
n = 50
a ) Atom is Strontium ( Sr )
Electronic configuration
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶5s²
b ) Sr²⁺
1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶
Help
SOS
IM SUPER CONFUSED
Answer:
reactant
Explanation:
oxygen is the one causing the change
Answer:
It is the one that is going into it so i think reactant
Explanation:
Sorry if i am wrong
differeniate between speed and acceleration
Answer:
speed is always positive
acceleration may be positive or negative
speed is scalar quantity
accleration vector quantity
Describe the correct electron dot diagrams for the first ten elements of the periodic table.
Answer:
Describe the correct electron dot diagrams for the first ten elements of the periodic table. H and Li will each have one dot, He and Be will each have two dots, B will have three, C will have four, N will have five, O will have six, F will have seven, and Ne will have eight. Sulfur has 16 electrons in its atoms.
Larry uses a transformer to step down an incoming voltage. The transformer has ten loops in the primary coil and six in the secondary. If the incoming voltage is 120 volts, what is the outgoing voltage?
A. 720
B. 72
C. 200
D. 20
The outgoing voltage : 72 V
Further explanationGiven
Vp=primary=120 V
Np=10
Ns=6
Required
the secondary voltage
Solution
[tex]\tt \dfrac{V_p}{V_s}=\dfrac{N_p}{N_s}[/tex]
Input the value :
[tex]\tt \dfrac{120}{V_s}=\dfrac{10}{6}\\\\V_s=\dfrac{120\times 6}{10}=72~V[/tex]
AgF + Fe2(CO3)3 = FeF3 + Ag2CO3
Answer: Silver Fluoride + Ferric Carbonate = Ferric Fluoride + Silver Carbonate
Reaction Type
Double Displacement (Metathesis)
Reactants
Silver Fluoride - AgF
Argentous Fluoride Silver(I) Fluoride
Molar Mass of AgF Bond Polarity of AgF Oxidation State of AgF
Ferric Carbonate - Fe2(CO3)3
Molar Mass of C3Fe2O9 Oxidation State of C3Fe2O9
Products
Ferric Fluoride - FeF3
Molar Mass of F3Fe Oxidation State of F3Fe
Silver Carbonate - Ag2CO3
Silver(I) Carbonate
Molar Mass of CAg2O3 Oxidation State of CAg2O3
Explanation: did u understand that? if not pls contact me in the contacts ty
What is the "octet rule?"
a.
The octet rule says that atoms are most stable when they have a full shell of electrons in the outermost shell
c.
The octet rule says that any atom can form a maximum of eight covalent bonds
b.
The octet rule states that the sum of all electrons in the lower subshells must equal eight
d.
None of the above
Answer:
A
Explanation:
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell. When atoms have fewer than eight electrons, they tend to react and form more stable compounds. When discussing the octet rule, we do not consider d or f electrons. Only the s and p electrons are involved in the octet rule, making it useful for the main group elements (elements not in the transition metal or inner-transition metal blocks); an octet in these atoms corresponds to an electron configurations ending with s2p6 .
Answer:
it's A
The octet rule is a chemical rule of thumb that reflects the theory that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.
The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. An exception to an octet of electrons is in the case of the first noble gas, helium, which only has two valence electrons.
Explanation:
please mark me as brainliest thank
a student conducts an experiment to test how the temperature affects the amount of sugar that cab dissolve in water. In the experiment, she uses 100 milliliters of water in each trial and stirs for five minutes each time.
What is the dependent variable?
a. the time stirred
b. the temperature of the water
c. the amount of water
d. the amount of sugar
Answer:
Answer: B) the temperature of the water
Explanation: The independent variable is the one that is manipulated or changed
You are a scientist working on increasing the efficiency of appliances to waste less
electricity. You are running experiments measuring the input, output, and waste energy
from 3 light bulbs. Given the data below, determine which model has the lowest
percentage of energy lost as waste.
Lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out
Lightbulb 2: 100 joules in, 30 joules wasted, 70 joules out
Lightbulb 3: 150 joules in, 100 joules wasted, 50 joules out
Lightbulb 1 has the lowest percentage of energy lost as waste : 25%
Further explanationGiven
The input, output, and waste energy of Lightbulb
Required
The lowest percentage of energy lost as waste.
Solution
Lightbulb 1 :
[tex]\tt \%energy~lost=\dfrac{50}{200}\times 100\%=25\%[/tex]
Lightbulb 2 :
[tex]\tt \%energy~lost=\dfrac{30}{100}\times 100\%=30\%[/tex]
Lightbulb 3:
[tex]\tt \%energy~lost=\dfrac{100}{150}\times 100\%=66.7\%[/tex]
Answer: lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out
Explanation:
PLEASE HELP
Which diagram represents a gas that has been ionized?
Answer: It would have to be Diagram 4
Explanation: That is the only one that looks Ionized and you can hook up a picture of an Ionized Diagram online. That can also help with this question.
Water gas
3
Copper oxide and carbon dioxide are made when copper carbonate is heated strongly. Which
is a product?
(1 Point)
Heat
Copper carbonate
Copper oxide
Oxygen
The product : Copper oxide
Further explanationGiven
Word equation
Required
The product of the reaction
Solution
The chemical equation can be expressed in terms of:
words equation the skeleton equation balanced equationIf we state the word equation above into a chemical equation(with formula)
CuCO₃ ⇒ CuO + CO₂
This reaction is a type of decomposition reaction
AB⇒A+B
Where the copper carbonate is decomposed into copper oxide and carbon dioxide
As we know, in a chemical reaction, the reactants are on the left and the products are on the right
So that the products of this reaction are copper oxide and carbon dioxide and the reactants are copper carbonate
Question 15 of 25
What is the standard cell notation of a galvanic cell made with aluminum and
magnesium?
A. Al3+(aq) | Al(s) || Mg(s) | Mg2+(aq)
B. Mg2+(aq) | Mg(s) || Al(s) | A13+(aq)
C. Mg(s) | Mg2+(aq) || A13+(aq)| Al(s)
D. Al(s) | Al3+(aq) || Mg2+ (aq) | Mg(s)
SUBMIT
The standard cell notation of a galvanic cell made with aluminum and magnesium is option A. Al3+(aq) | Al(s) || Mg(s) | Mg2(aq).
The right side is the cathode and the left side is the anode. The cell is represented by the convention that the metal is written first, then the metal ions present in the electrolyte. And these two should be separated by a vertical line. Zinc becomes the cathode of the galvanic cell.
Galvanic cells consist of two different metal electrodes connected by a conductive solution electrolyte, which are also connected externally to complete an electrical circuit. Cell notation or cell representation in chemistry is a simple way of representing reactions in an electrochemical cell. The silver half-cell is reduced due to its high standard reduction potential. Tin half-cells are oxidized.
Learn more about Galvanic cells here:-https://brainly.com/question/28182115
#SPJ1
Answer: C
Explaination:
What is the total pressure in units of kPa in a 7.85 L container that contains 4.45 moles of N2 and 2.45 moles of O2 at a temperature of 307 K?
Answer:
Total pressure = 22.15 atm
Explanation:
Given data:
Total pressure = ?
Volume of container = 7.85 L
Number of moles of N₂ = 4.45 mol
Number of moles of O₂ = 2.45 mol
Temperature = 307 K
Solution:
Pressure of N₂:
PV = nRT
P = nRT/V
P = 4.45 mol ×0.0821 atm.L/mol.K ×307K / 7.85L
P = 112.16 atm.L/7.85 L
P = 14.28 atm
Pressure of O₂:
PV = nRT
P = nRT/V
P = 2.45 mol ×0.0821 atm.L/mol.K ×307K / 7.85L
P = 61.75 atm.L/7.85 L
P = 7.87 atm
Total pressure = P(N₂) + P(O₂)
Total pressure = P( 14.28 atm) + P( 7.87 atm)
Total pressure = 22.15 atm
2. How much energy must be removed from a 50.0 g sample of steam in order to get it to condense
into a liquid? (assume the steam is at 100 ℃)
Answer:
113 kJ or 113,000J
Explanation:
Since we are condensing it, a physical change in the state of matter is occurring. 113 kJ or 113,000J because of the following equation: Q = 2260 times 50. 2260 is the Heat of Vaporization constant.
8. A wave has a frequency of 46 Hz and a wavelength of 2.1 meters. What is the speed of the wave?
Answer:
the speed of the wave is 96.6
Explanation:
to find do frequency x wavelength