Select the correct terms to complete the statement. The words in red, type which word
completes the statement correctly.
Electron-dot notation shows only the electrons in the innermost/outermost energy shell of
an atom. These electrons are called valence/orbital electrons and are/ are not involved in
chemical reactions. Elements with a full outer energy shell are typically very reactive/
unreactive.
Answers
Answer:
Outermost energy shell
Valence electrons
are involved
Unreactive
Explanation:
Electron-dot notation shows only the electrons in the outermost energy shell of an atom. These electrons are called valence electrons and are involved in chemical reactions. Elements with a full outer energy shell are typically very reactive.
The notation shows only the chemical symbol of the element surrounded by dots that represents the valence electrons. The chemical symbol denotes the nucleus and all electrons except the valence electrons. These valence electrons are the outer shell electrons. They take part in chemical reactions and determines the chemical properties of an atom. Elements with completely filled outer orbitals are unreactive and they are the noble gases.Related Questions
You performed an experiment to find out how far three different sizes of
arrows would fly from a bow. Which of the following is a new scientific
question that can be investigated in the laboratory?
A. How much money should you spend on arrows?
B. How much farther does the arrow fly when you use a stronger
bow?
C. What type of arrow looks the coolest as it flies?
D. Are people more interested in seeing larger or smaller arrows in
movies?
Answers
Answer:
B how much farther does the arrow fly when you use a stronger bow
Explanation:
Option b. How much farther does the arrow fly when you use a stronger bow? represent the new scientific question that can be investigated in the laboratory.
What is the scientific question?It is a question that may result in a hypothesis for helping out in. It should be answering or figuring out the reason for some kind of observation.
So based on this, we can say that Option b. How much farther does the arrow fly when you use a stronger bow? represent the new scientific question that can be investigated in the laboratory.
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what is magnesium? why does your body need it? how much do you need (per day)? What happens if you have too much or too little of it? Which foods do you find in it? What are some facts about magnesium?
Answers
Magnesium is a nutrient that the body needs to stay healthy. if you dont get enough magnesium in your body then you could get magnesium deficiency. Symptoms of magnesium deficiency include loss of appetite, nausea, vomiting, fatigue, and weakness. Extreme magnesium deficiency can cause numbness, tingling, muscle cramps, seizures, personality changes, and an abnormal heart rhythm. The RDA for magnesium is 310–420 mg for adults depending on age and gender. Sources of magnesium are greens, nuts, seeds, dry beans, whole grains and low-fat dairy products.
random facts:
A magnesium ion is present in the chlorophyll molecule of every living green plant.
Magnesium is critically important for the human metabolic system's functioning.
ILL GIVE BRAINLIST IF YOU GET IT RIGHT Which of the following is an example of gravitational potential energy?
Question 9 options:
A battery powering a radio
A flag waving in the wind
A glass jar sitting on a shelf
A ball rolling along a sidewalk
Answers
If the shelf gets tipped the jar will slide off and convert to kinetic energy as gravity pulls it to land on the next level/floor
Plz help!
It takes a car going 40 mph 3 seconds to come to a stop. What is the acceleration?
Answers
Answer:
6 second???
Explanation:
Im so sorry if thats wrong!!!!
Name:
R = 0.0821 Latm
PV = nRT
P1 V1\ n1 T1 =P2 V2/ n2 T2
1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature
of 28.5 °C?
2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has
cooled?
Answers
Answer:
1. V = 1.47L
Explanation:
1) Using PV = nRT
Where;
P = pressure (atm)
V = volume (L)
R = gas constant (0.0821 Latmk mol)
n = number of moles
T = temperature (K)
To get number of moles, we say mole = mass/molar mass
Molar Mass of C2H2 = 12(2) + 1(2)
= 24 + 2 = 26g/mol
mole = 3.86/26
mole = 0.148mol
T (K) = 28.5°C + 273.15
T(K) = 301.65K
PV = nRT
2.5 × V = 0.148 × 0.0821 × 301.65
2.5V = 3.665
V = 3.665/2.5
V = 1.466
V = 1.47L
R =
PV = nRT
P1 V1\ n1 T1 =P2 V2/ n2 T2
1. What volume, will be occupied by 3.86 g of C2H2 gas (acetylene) at 2.50 atm and a temperature
of 28.5 °C?
2. A gas at 650.0 torr and 75 °C is cooled to 25 °C. What is the pressure of the gas after it has
cooled?
on platooooo
What does the law of conservation of energy state?
A.
Energy can be created from nothing.
B.
Energy cannot be destroyed.
C.
Energy cannot change forms.
D.
The total amount of energy in a system changes continuously.
Answers
Answer:
Your answer is B. Energy cannot be destroyed
Explanation:
The total amount of energy remains constant in an isolated system. It states that energy can neither be created nor destroyed, but it can change from one form to another.
Explanation: energy can’t be destroyed you can only store it
what is the amount of matter in an object.
A mass
B volume
C Density
Answers
Answer:
Option A
Explanation:
The answer is "mass" or option A. It's not option B because volume is the amount of space in a object which is not what the question is asking for. It's also not option C because density goes hand in hand with volume measuring how much space a object takes up, and also density is mass per volume. Leaving only option A, therefore it is your answer.
Hope this helps.
Which molecule contains only single covalent bonds?
A CL
B CO2
C CN2
D 02
Answers
CO2 i think if you understand so mark me as brainliest please.
Answer:
a
Explanation:
because that is a clorune that compose of a single covalent bonds
Which of the following is NOT an element? Nickel Potassium Carbon dioxide Aluminum
Answers
Answer:
carbon dioxide
Explanation:
carbon dioxide is a compound
A block of wood has the mass of 180 grams.it is 10 cm long,6 cm wide and 4 cm thick.what is it’s density?
Answers
Answer:
0.75 g/cm³
Explanation:
Given data:
Mass of wooden block = 180 g
Length of block = 10 cm
Width of block = 6 cm
Height or thickness = 4 cm
Density of block = ?
Solution:
Volume of block = height × length × width
Volume of block = 4 cm × 10 cm× 6 cm
Volume of block = 240 cm³
Density of block:
density = mass/ volume
d = 180 g/ 240 cm³
d = 0.75 g/cm³
Jodie is studying the sleeping habits of various types of animals. She wants to know how long each type of animal sleeps during the day.
Jodie puts each of the animals in a cage with food, water, and light. However, she cannot stay to watch the animals all day.
Which of the following tools would be most helpful to Jodie's experiment?
A.
a tape recorder
B.
a video camera
C.
a metric ruler
D.
a triple beam balance
Answers
Would rust be considered a chemical or physical change? (I know the answer) Answer this first, and you will receive 20pts regardless, and will receive the "Most Brainiest." (I'm just testing you). I will correct any wrong answers. Any answer afterwards, will be for fun. :)
Answers
Answer:
pretty sure it's chemical
Answer:
Its a chemical
Explanation:
Which statement best describes a source of new genetic variations in a species? A. Asexual reproduction produces many offspring with a successful set of genes.
B. Sexual reproduction results in offspring that each have a unique set of genes.
C. Lifelong leaming helps offspring with the same parents have different skills.
D. Limited resources cause some offspring to survive longer than others,
Answers
Answer:
B. Sexual reproduction results in offspring that each have a unique set of genes.
Explanation:
New genetic variation arises in a species as a result of sexual reproduction which results in offspring having a unique set of genes.
Genetic variation is the differences in the genetic make up of organisms within a population. During sexual reproduction, there is an exchange of materials between sexes and the new combination produces a varied form of the original genetic materials. The main source of genetic variation is mutation.Answer:
B
Explanation:
What’s the difference in the number of protons of an atom of lithium and an atom of chlorine :)) I need this answer quick
Answers
Answer:
14
Explanation:
The lithium atom has 3, which is its atomic number. (Atomic number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.) The chlorine atom has 17, so if you find the difference, it would be 14.
32.0 g SO2
Calculate the number of moles
Answers
500 moles
Explanation:
Given mass of SO2 = 32
Molar mass of SO2 =64
So, 32x10^8/64=500
Please hurry I'm in a test!!!
Consider the following intermediate chemical equations.
2 equations. First: 2 upper N a (s) plus upper C l subscript 2 (g) right arrow 2 upper N a upper C l (s). Second: 2 upper N a subscript 2 upper O (s) right arrow 4 upper N a (s) plus upper O subscript 2 (g).
In the final chemical equation, NaCl and O subscript 2 are the products that are formed through the reaction between Na subscript 2 O and Cl subscript 2. Before you can add these intermediate chemical equations, you need to alter them by
A.) multiplying the second equation by 2.
B.) multiplying the first equation by 2.
C.) multiplying the first equation by (1/2).
D.) multiplying the second equation by (1/4).
Answers
Answer:
OMG Why has nobody answered this FREE 40 POINTS!!!!
For your ConVenIence Sir!
I shall provide thine with the answer, copied from other great sir.
B.) multiplying the first equation by 2.
Explanation:
Here is an image for Thine HappyNess!!!!!!!!!!!!! :D :D :D :D
Before adding the intermediate chemical equations to get the final products first we have to multiplying the first equation by 2.
What is the stoichiometry?Stoiciometry of any chemical reaction gives idea about the amount of species present before and after the completion of the reaction.
Given first intermediate chemical equation is:
2Na(s) + Cl₂ → 2NaCl(s)
Second intermediate chemical equation is:
2Na₂O(s) → 4Na(s) + O₂(g)
Final products of the given chemical reactions are NaCl and O₂ which are formed by the below given balanced chemical reaction:
2Na₂O + Cl₂ → 4NaCl + O₂
To get the desire balance chemical equation before adding the given intermediate equation, first we have to multiply the first equation by 2.
Hence option (B) is correct.
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Which of the following is referenced in the modern "periodic law"
A. Atomic mass
B. Electron configuration
C. Wavelengths of radiation
D. Atomic number
Answers
You pull a sled with a package on t across a snow-covered fiat lawn. If you
apply a force of 46.8N to the sled, I accelerates at 0.75 m/s2 What is the
combined mass of the package and the sied? (Assume there is no friction
Answers
Answer:
Explanation:
Answer:
62.40kg
Explanation:
What mass of sodium hydroxide is needed to make 0.500 L of 2.50 M NaOH ?
Answers
Answer:
50 g NaOH
General Formulas and Concepts:
Chemistry - Solutions
Reading a Periodic TableUsing Dimensional AnalysisMolarity = moles of solute / liters of solutionExplanation:
Step 1: Define
0.500 L
2.50 M NaOH
x moles of solute
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of NaOH - 22.99 + 16.00 + 1.01 = 40 g/mol
Step 3: Find moles of solute
2.50 M NaOH = x moles NaOH / 0.500 L
x = 1.25 moles NaOH
Step 4: Convert
[tex]1.25 \ mol \ NaOH(\frac{40 \ g \ NaOH}{1 \ mol \ NaOH} )[/tex] = 50 g NaOH
Step 5: Check
We are given 3 sig figs. Since our final answer has 2 sigs, there is no need to round.
plzzzzzz help me ?????
8. Well-aerated soils have the _______________ smell of good soil.
Answers
Answer:
Pore spaces filled with water
The given diagram shows the structure of an electrolytic cell.
Ella wants to construct an electrolytic cell using equipments found at home.
Give examples of materials (found at home )she can use for :
1. Anode (+Ve)
2. Cathode (-Ve)
3. Electrolyte ( Ella plans to use salty water. Will it work ? )
4. External Circuit (Battery) How powerful must it be
5.Bulb ( What kind ?)
Answers
Answer:
1. she requires the anode and cathode
3. the electrolyte : the increase amount of salty water she uses will determine the transfer in of electron needed to power the bulb
4. the battery she uses must be able to power a torch
5. the bulb could be a torch bulb or a bulb lesser than 25 watts
Which of the following is the correct formula for cesium sulfide
Answers
Answer:
Cs2S
Explanation:
The chemical formula of cesium sulfide is Cs₂S.
What is the chemical formula?A chemical formula gives information about the chemical proportions of atoms of each element in a chemical compound or molecule. The chemical formula of a compound can be written by utilizing the chemical symbols of elements, numbers (subscripts), and other symbols, such as plus (+) and minus (−) signs, commas, dashes, and brackets.
A chemical formula of a compound consists of not any words but can be represented in certain simple chemical structures. Chemical formulae can be more restricted in power than chemical names and chemical structural formulae. In chemistry, we have two kinds of chemical formulas: one empirical formula and another molecular formula.
The chemical formula of cesium sulfide is Cs₂S which is an inorganic salt. It can be produced by the reaction of cesium and sulfur in solvent THF and also can be produced from cesium hydroxide and hydrogen sulfide.
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Which arrow would most likely represent the phase change that occurs when silver is poured into a mold and cools to become a solid bar?
Answers
Answer:
5
Explanation:
took test edge 2020
D. 5
got it correct on test <3
Which of the following minerals scratches
fluorite mineral?
a. talc
b. diamond
c. gypsum
d. calcite
Answers
Answer:
b. diamond
Explanation:
Diamond is the hardest known naturally occurring substance. And it will scratch any other minerals below it on the moh's scale of hardness.
Fluorite is below diamond in the scale of hardness and it will readily scratch it. Talc, is the softest mineral, it will not scratch fluoriteBoth gypsum and calcite also below fluorite. They will not scratch this mineral.Which property of an atom or element will determine how it reacts with other elements or atoms?
O valence electrons
O protons
O neutrons
O electrons
Answers
Answer:
valence electrons
Explanation:
This is because the valence electrons determine if an atom of an element can bond with other elements.
When the volume of the gas is 8L what is the pressure being exerted upon it?
Answers
Answer:
54
Explanation:
Recall that atoms gain or lose electrons to become ions. So, an ion has a different number of electrons than its corresponding neutral atom. Positive ions have lost electrons, and negative ions have gained electrons. The table includes the electron configuration of several ions. Complete the rows for magnesium and oxygen (oxide) ions by identifying the correct ion charge, electron configuration, and neutral atom with the same configuration as the ion. You may need to use online resources or the periodic table to determine the correct ion charges. Select the correct answer from each drop-down menu to complete the table.
Answers
Answer:
2+/1s2 2s2 2p6/neon
2−/1s2 2s2 2p6/neon
Explanation:
Explanation:
A magnesium atom that loses two electrons to become a magnesium cation has the same electron configuration as neon. An oxygen atom that gains two electrons to become an oxygen anion also has the same electron configuration as neon.
Ion Ion Charge Electron ConfiguratIon Neutral Atom with Similar
Electron ConfiguratIon
sodium 1+ 1s2 2s2 2p6 neon
magnesium 2+ 1s2 2s2 2p6 neon
aluminum 3+ 1s2 2s2 2p6 neon
potassium 1+ 1s2 2s2 2p6 3s2 3p6 argon
calcium 2+ 1s2 2s2 2p6 3s2 3p6 argon
nitrogen (nitride) 3− 1s2 2s2 2p6 neon
oxygen (oxide) 2− 1s2 2s2 2p6 neon
fluorine (fluoride) 1− 1s2 2s2 2p6 neon
sulfur (sulfide) 2− 1s2 2s2 2p6 3s2 3p6 argon
chlorine (chloride) 1− 1s2 2s2 2p6 3s2 3p6 argon
Answer:
Below
Explanation:
Second image
Stoichiometry: Calculate the moles of H2 produced by .042 g Mg in the equation Mg + 2HCl > MgCl2 + H2
Answers
Answer:
Mg (s) + 2HCI2 (aq) → MgCI2 (aq) + H2 (g)
I think this is the correct answer I not a 100% sure if it is correct.
Explanation:
Guessing
Two reasons that show sugar is a compound
Answers
Answer:
Sugar, any of numerous sweet, colourless, water-soluble compounds present in the sap of seed plants and the milk of mammals and making up the simplest group of carbohydrates. (See also carbohydrate.) The most common sugar is sucrose, a crystalline tabletop and industrial sweetener used in foods and beverages.
Explanation:
PLS HELP ASAP!!!!!! WILL GIVE BRAINLIEST!!!!!!!!!!
Write a summary paragraph for each part discussing this experiment and the results. Use the following questions and topics to help guide the content of your paragraph. Part 1 What was your hypothesis? According to your data, do you think your hypothesis was correct? (Be sure to refer to your data when answering this question.) Summarize any difficulties or problems you had in performing the experiment that might have affected the results. Describe how you might change the procedure to avoid these problems. Be sure to submit your data along with your paragraph. Part 2 What effect did the temperature have on the viscosity of the honey? (Be sure to refer to your data when answering this question.) Give at least two practical examples where knowledge of viscosity is important.
Answers
Answer:
Explanation:
Dang which subject is this history or science