What chemical bonds occur to get oxygen?
Explanation:
covalent bonds
Two covalent bonds form between the two oxygen atoms because oxygen requires two shared electrons to fill its outermost shell.
a,b,c, or d?
(will give brainliest)
Answer:
b
Explanation:
Which properties of alkaline earth metals decrease going down group 2?
Answer:
Ionization energy
Electron affinity
Electronegativity
Explanation:
what 3 pieces of evidence did wegener use to support his theory
What is the percent composition of Fluorine in CF5?
Which atom had the largest ionization energy 1) Na 2)cl 3)O 4)Se
Answer:
Na
Explanation:
Na Because it's exist in group 1
Answer:
la tabla de la derecha muestra una lista de los elementos ordenados por su energía de ionización. El elemento de mayor energía de ionización es el Helio, y el de menor el Cesio. La unidad de energía de ionización es el electrón voltio (eV).
CAN SOMEONE PLEASE HELP ME?!
If you have a 17% salt solution, how much salt will need to be added to 71 mL of water?
Salt added : 14.5 g
Further explanationGiven
17% salt solution
71 ml water
Required
salt needed
Solution
%mass = (mass solute : mass solution) x 100%
71 ml water = 71 g water(density = 1 g/ml)
mass solute = x
[tex]\tt 17\%=\dfrac{x}{x+71}\times 100\%\\\\0.17(x+71)=x\\\\0.17x+12.07=x\\\\0.83x=12.07\\\\x=14.5[/tex]
MS (R) Science 7 Q3 20-21
Which statements describe molecules? Check all that apply.
Molecules are made of two or more atoms.
Molecules are all the same size
Molecules range in size.
Molecules are only made of atoms of the same element.
Molecules are only made of atoms of different elements.
Molecules are made of atoms of the same element or different elements.
Answer:
Molecules are made of two or more atoms
Molecules are made of atoms of the same element or different elements.
Molecules range in size.
Explanation:
A molecule is formed whenever two or more atoms combine. Hence we can define a molecule as a combination of two or more elements that are combined chemically and can not be separated by any physical means.
Molecules may be composed of the same atoms as in O2, F2 etc or different atoms as in CO2, H2O, etc.
The sizes of molecules differ. Some molecules are quite small in size while others are quite large in size.
Answer:
Molecules are made of two or more atoms
Molecules range in size
Molecules are made of atoms of the same element or different elements.
Step 5: Measuring the Volume of Air Near 20°C (Room Temperature) temperature of gas height of the column of gas
1. Temp of gas: 3C Height of the column of gas: 6.2cm
2. Temp of gas: 294K Volume of gas: 0.78cm3
Answer:
1. Temp of gas 21C, 6.2
2.Temp of gas 294, Volume of gas 0.78cm3
Explanation:
Just answered on Edge
Answer:
picture
Explanation:
edge 2021
The internal combustion engine takes advantage of the ability of the combustion reaction of gasoline to do _______ and move a piston up and down.
A. free energy
B. enthalpy
C. work
D. entropy
PLS HELP ASAP THANK YOU!!!
Question 1:
In photosynthesis what is used to convert water and carbon dioxide into glucose and oxygen?
carbonated water
heat energy from the sun
light energy from the sun
nutrients from decomposers
Question 2: Which term refers to microscopic plants?
consumers
copepod
phytoplankton
zooplankton
Question 3:
Which organism is a kind of phytoplankton?
algae
sea butterfly
copepod
lion’s mane jellyfish
-
please help!! and try and answer them all, not just one!
Answer:
Answer 1
light energy from the sun.
answer 2
Microscopic organisms are tiny life forms, often consisting of a single cell. ... Algae — these are single celled plants also known as phytoplankton (from the Greek, meaning drifting plants)
answer 3
Some phytoplankton are bacteria, some are protists, and most are single-celled plants. Among the common kinds are cyanobacteria, silica-encased diatoms, dinoflagellates, green algae, and chalk-coated coccolithophore
Explanation:
it uses light to convert water and carbon dioxide molecules into glucose (sugar molecule) and oxygen
Say I grab a bunch of aluminum foil (9.5g) and ball it up. Aluminum has a specific heat of .9J/g*C. How much would the aluminum’s temperature change if I added 67Joules of energy (Q) to it?
Answer:
ΔT = 0.78 °C
Explanation:
Given data:
Mass of Al = 9.5 g
Specific heat capacity of Al = 0.9 J/g.°C
Temperature change = ?
Heat added = 67 J
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
67 J = 9.5 g × 0.9 j/g.°C × ΔT
67 J = 85.5 j/°C × ΔT
ΔT = 67 J / 85.5 j/°C
ΔT = 0.78 °C
Need help please can someone do these willing to give brainiest!
Explanation:
a) K(s) + I2(s) --> KI(s)
The balanced equation is;
2K(s) + I2(s) --> 2KI(s)
b) Mg(s) + Br2(l) --> MgBr2(s)
The balanced equation is;
Mg(s) + Br2(l) --> MgBr2(s)
c) KBr(aq) + AgNO3(aq) --> KNO3(aq) + AgBr(s)
The balanced equation is;
KBr(aq) + AgNO3(aq) --> KNO3(aq) + AgBr(s)
d) KClO3(s) --> KCl(s) + O2(g)
The balanced equation is;
2KClO3(s) --> 2KCl(s) + 3O2(g)
e) C2H6(g) + O2(g) --> CO2(g) + H2O(l)
The balanced equation is;
2C2H6(g) + 7O2(g) --> 4CO2(g) + 6H2O(l)
f) Al(s) + O2(g) --> Al2O3(s)
The balanced equation is;
4Al(s) + 3O2(g) --> 2Al2O3(s)
g) P4(s) + H2(g) --> PH3(g)
The balanced equation is;
P4(s) + 6H2(g) --> 4PH3(g)
After the nuclear plant in Japan failed in 2011, nuclear waste was released into the surrounding groundwater and ocean. How did this impact the surrounding human population?
A)The nuclear waste leaked into the ground and stayed in that location, affecting only humans who farmed or otherwise disturbed the soil.
B)The nuclear waste was not radioactive; therefore it did not affect the human population
C) The nuclear waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer.
D)The nuclear waste leaked into the sea and affected those exposed to seawater, but did not affect those on land
Answer:
C) The nuclear waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer.
Explanation:
your welcome girlies <33
The nuclear waste leaking into groundwater and exposing humans to radiation was how nuclear plant impacted the human population.
What is Nuclear plant?This is referred to a thermal power station in which the heat source is a nuclear reactor with radioactive elements.
The waste leaked into groundwater, and exposed humans to radiation that could potentially cause cancer which was how it affected the surrounding human population and why option C was chosen.
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During the formation of the compound sodium chloride, the correct symbol and charge for each of the ions must be...
O Na+1 and Cl-1
O Na+1 and F-1
O Na+1 and Br-1
O Na+1 and O-2
Answer: The correct answer is option A. [tex]Na^+\text{ and }Cl^-[/tex]
Explanation:
An ionic compound is defined as the compound formed by the complete transfer of electrons from one element (forming cation) to another element (forming anion)
Sodium (Na) is an element having atomic number 11 and its electronic configuration is [tex]1s^22s^22p^63s^1[/tex]
It will loose 1 electron to form [tex]Na^+[/tex] ion (cation)
Chlorine (Cl) is an element having atomic number 17 and its electronic configuration is [tex]1s^22s^22p^63s^23p^5[/tex]
It will gain 1 electron to form [tex]Cl^-[/tex] ion (anion)
The ionic compound so formed will have the chemical formula of NaCl.
Hence, the correct answer is option A. [tex]Na^+\text{ and }Cl^-[/tex]
I need help, thank you.
Answer:
B
Explanation:
hope this helps :)
The Big Bang theory is used to explain the origins of the universe. Why is this called a theory and NOT a law?
Answer:
It's called a theory because it has not been proven yet. so we can not claim it to be a fact without proof.
Answer: There is no concrete evidence.
Explanation: If we could do an experiment and create the Big Bang and watch it happen and study it, it would be law. It's for the same reason that evolution is considered a theory. We are not watching it take place and there is no eye witness account of evolution happening because evolution happens over millions and millions of years. If we could sit here and watch the universe be created without need for simulations or theories, then it would be law.
Hexane burns in air to form carbon dioxide and water. The oxygen is store at 40.0 Celsius and at a pressure of 106.6kPa. How many moles of oxygen will react with 500. Grams of hexane
Answer: 55.233 moles of oxygen will react with 500 g of hexane.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given mass of hexane = 500g
Molar mass of hexane = 86 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of hexane}=\frac{500g}{86g/mol}\\\\\text{Moles of hexane}=5.814mol[/tex]
The chemical equation for the reaction of burning of hexane in air follows:
[tex]2C_6H_{14}+19O_2\rightarrow 12CO_2+14H_2O[/tex]
By stoichiometry of the reaction:
2 moles of hexane reacts with 19 moles of oxygen
So, 5.814 moles of hexane will react with = [tex]\frac{19}{2}\times 5.814=55.233moles[/tex] of oxygen
Hence, 55.233 moles of oxygen will react with 500 g of hexane.
Please help ASAP!
Explain how to find the combining ratio and chemical formula between the following pairs of elements using the periodic table:
-Rubidium and sulfur
-Sodium and oxygen
Please explain your answer and dont answer if you dont know
Explanation:
Rubidium is in Group 1 and exists as Rb+ ions.
Sulfur is in Group 16 and exists as S2- ions.
To form a compound containing rubidium and sulfur, the charges of the ions must be equal.
Therefore there are 2 rubidium and 1 sulfur atoms.
=> Chemical formula is Rb2S.
Sodium is also in Group 1 and exists as Na+ ions.
Oxygen is also in Group 16 and exists as O2- ions.
Therefore there are 2 sodium and 1 oxygen atoms.
=> Chemical formula is Na2O.
The chemical formula of the compounds form are as follows;
For Rubidium and sulfur; Rb2SFor Sodium and oxygen; Na20Discussion:
Rubidium, Rb is in Group 1 and ionises as Rb+ ions.Sulfur, S is in Group 16 and ionises as S2- ions.To form a compound between rubidium and sulfur, the net charge must be zero
As a result, we need 2 rubidium and 1 sulfur atoms.
Chemical formula is therefore; Rb2S.Similarly, Sodium, Na is in Group 1 and ionises as Na+ ions.
Oxygen, O is in Group 16 and ionises as O2- ions.
To form a compound between Sodium and Oxygen, the net charge must be zero
As a result, we need 2 Sodium and 1 Oxygen atoms.
Chemical formula is therefore; Na2O.Read more:
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Chlorine gas is produced by the reaction: 2 HCl --> H2 + Cl2
How many moles of HCl must react to produce 10.0 L of chlorine gas at STP?
Answer:
i believe its 1.56
Explanation:
help i am using all my points on thisss will mark brainliest
1 sodium bromide
2 scandium
3 aluminium selenide
4 sodium fluoride
5 potassium chloride
6 strontium fluoride
7 magnesium bromide
8 sodium oxide
9 lithium oxide
10
11 lithium fluoride
12 calcium bromide
13 methyl beta-d-glucopyeanoside
14
15sodium chloride and 16 sodium nitrate
(hope it helped) ❄️❄️❄️
The combustion reaction for methane is shown below:
CH4 (9) + 2O2 (g) → CO2 (g) + 2H20 (9) + energy
If 64.0 g of methane is reacted with excess oxygen gas, what is
the pressure exerted by water vapor assuming the reaction
went to completion in a 24.0 L engine at 515 K?
Answer:
P = 14.1 atm
Explanation:
Given data:
Mass of methane = 64 g
pressure exerted by water vapors = ?
Volume of engine = 24.0 L
Temperature = 515 K
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O + energy
Number of moles of methane:
Number of moles = mass / molar mass
number of moles = 64 g/ 16 g/mol
Number of moles = 4 mol
Now we will compare the moles of water vapors and methane.
CH₄ : H₂O
1 : 2
4 : 2/1×4 = 8 mol
Pressure of water vapors:
PV = nRT
R = general gas constant = 0.0821 atm.L/mol.K
P = 8 mol × 0.0821 atm.L/mol.K× 515 K / 24.0 L
P = 338.25 atm.L/ / 24.0 L
P = 14.1 atm
Calcium carbonate, CaCO3 (also called calcite), is the principal mineral found in limestone, marble, chalk, pearls, and the shells of marine animals such as clams. A certain sample
of calcium carbonate contain 4.86 moles. What is the mass in grams of this sample?
Answer:
486 grams
Explanation:
No of moles = mass in gram / molar mass
Mass in gram = No of moles × molar mass
Molar mass of CaCO3 = 40+12+(16*3)
= 40+12+48 = 100 amu
Mass in gram = 4.86 × 100
Mass in gram 486 grams
Please help!!!! The question is down below!
PLEASE HELP MEEEE!!!!
1. 18 L
2. 20.832 L
Further explanationGiven
Combustion of ethane
Required
Volume of CO₂
Solution
Avogadro's Law :
In the same T,P and V, the gas contains the same number of molecules
So the ratio of gas volume will be equal to the ratio of gas moles
V₁/n₁=V₂/n₂
1. From equation, mol ratio of C₂H₆ : CO₂ ⇒ 2 : 6
so the volume of CO₂ :
= 6/2 x 6 L
= 18 L
2. mol ethane (MW=32 g/mol) :
= mass : MW
= 10 g : 32 g/mol
= 0.31
mol CO₂ :
= 6/2 x 0.31
= 0.93
The volume CO₂(assume at STP) = 20.832 L
i am so confused
How are Salts formed ?
a) by the covalent bonding of neutral atoms
b) by the covalent bonding of oppositely charged ions
c) by the iconic bonding of a cation and an anion
d) by intermolecular hydrogen bonding
please get me the right answer
Answer:
I think is answer B
but you can chek
Answer:
C
Explanation:
All salts are ionic compounds. Think about NaCl. Na+ is a cation and Cl- is an anion. NaCl form an ionic compound and are then considered a salt.
What is the average speed of a cheetah that runs 9 km in 10 minutes?
Answer:
0.9m/s
hope it helps....
4AI + 302 — 2Al2O3
In this reaction, how many grams of O2 are required to
completely react with 110 grams of Al?
Answer:
Mass = 96 g
Explanation:
Given data:
Mass of oxygen required = ?
mass of Al = 110 g
Solution:
Chemical equation:
4Al + 3O₂ → 2Al₂O₃
Number of moles of Al:
Number of moles = mass/molar mass
Number of moles = 110 g/ 27 g/mol
Number of moles = 4 mol
Now we will compare the moles of Al and oxygen.
Al : O₂
4 : 3
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 3 mol × 32 g/mol
Mass = 96 g
At room temperature, the greatest attractive forces exist between particles of
A. a solid
B. a gas
C. a liquid
Answer:
Solid
Explanation:
because their molecules are tightly packed.
According to the forces of attraction, at room temperature, the greatest attractive forces exist between particles of a solid.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
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