Answer:
1 is the chemical formula for water, meaning that each of its molecules contains one oxygen and two hydrogen atoms.
2 a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.
3 Chemical abbreviation for sodium chloride (table salt)
Which is an example of geologic evolution?
Answer:
A gradual change in the shape of the continents.
Explanation:
An example is tropical plant fossils are found in the Artic.
An example of geologic evolution is a gradual change in the size of continents.
Geological evolution is the process of gradual change and events in antiquity that include the steps to create the Earth.
At first, there was extreme volcanism, later the planet cooled to create the crust. Also, condensed water vapor formed the oceans and seas.
The geological history of Earth follows the major geological events in Earth's past based on the geological time scale, a system of chronological measurement based on the study of the planet's rock layers (stratigraphy).
Geological evolution studies the shape of the globe, how it formed, and the relationships of the different eras and the matter that changed during them.
Therefore, An example of geologic evolution is a gradual change in the size of continents.
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I need help with this question.
Instruction : Answer the following questions using the given options.
Questions :
1. The reaction between an acid and a base is an example of ___ reaction ?
a. Valence
b. Endothermic reaction
c. Chemical reaction
d. Exothermic reaction
2.The following are the factors affecting the rate of a chemical reaction except ___
a. catalyst
b. nature of reactants
c. activation energy
d. lights
3.___ gives a dense white fume when in contact with HCL
a. propane
b. ammonia
c. tetraoxosulphate(vi) acid d. water
Explanation:
The reaction between an acid and a base is known as a neutralisation reaction.
Reactant concentration. Increasing the concentration of one or more reactants will often increase the rate of reaction. ...
Physical state of the reactants and surface area. ...
Temperature. ...
Presence of a catalyst.
ammonia
An alkaline gas which produces dense white fumes when reacted with HCl gas is ammonia and fumes are of compound ammonium chloride.
BRAINILIEST PLEASE
what device has made car emissions much cleaner?
automatic transmission
better wheels
tail pipes
catalytic converters
Answer:
automatic transmission
Explanation:
An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in motor vehicles that does not require any driver input to change gears under normal driving conditions.
Does Water gives the body the ability to do work. True or false
Answer:
I think it's true
Explanation:
hey by the way
How many atoms does methane=CH4?
Answer:
It has 1 carbon atom and 4 hydrogen atoms
Explanation:
hope this helps :)
3. How are natural selection and selective breeding related?
can someone help?
Answer:
In natural selection, organisms adapt to the environment to best suit nature's needs to survive. In selective breeding, it's as if nature were humans and the humans can choose which organisms can survive and die. They do it so they can develop organisms with desirable characteristics.
If 186.0 liters of gaseous O_{2} at 1.09 atm and 577.0 ºC are required for the model rocket to climb 1000 feet, how many grams of solid KClO_{3} must be in the rocket engine?
Answer:
The right answer is "236.53 g".
Explanation:
The given values are:
P = 1.09 atm
V = 186 liters
The reaction will be:
⇒ [tex]KClO_3 (s)\rightarrow 2Kcl(s)+3O_2(g)[/tex]
The moles of O₂ will be:
= [tex]\frac{PV}{RT}[/tex]
On substituting the values, we get
= [tex]\frac{1.09\times 186}{0.0821\times 850}[/tex]
= [tex]\frac{202.47}{69.785}[/tex]
= [tex]2.90 \ moles[/tex]
Now,
1 mole O₂ is produced from
= [tex]\frac{2}{3} \ mol \ KClO_3[/tex]
then,
2.90 mole O₂ is produced from 2 mol KClO₃
= [tex]\frac{2}{3}\times 2.90[/tex]
= [tex]1.93 \ mol \ KClO_3[/tex]
hence,
The number of grans of solid in the engine will be:
= [tex]1.93\times 122.55[/tex]
= [tex]236.53 \ g[/tex]
5.
Which sentence best describes the relationship between genes and chromosomes?
A.
Genes are found within chromosomes.
B.
Several chromosomes make up one gene.
C.
Genes and chromosomes are the only things that form the nucleus.
D.
Several genes are attached to different parts of the Golgi apparatus.
Answer:
a
Explanation:
How many grams are in 5 mole of carbon dioxide? (CO2)
plz include your work
Answer: Hence, mass of CO2 is 22g.
Explanation: N/A
Answer:
mole=mass/RMM
5mole =mass/44
mass= 44×5=220grams
Explanation:
Co2 molecular weight =44 ,cross multiply then you get your mass.
La clorurarea catalitică a toluenului, se obţine un amestec format din 2-clorotoluen, 4-clorotoluen şi benzennereacționat în raport molar de 3 : 2 : 1. Calculaţi cantitatea de 2-clorotoluen, exprimată în moli, care se obținedin 110,4 g de toluen, în în prezența catalizatorului FeCl3.
Answer:
i dont lnow you heat alcohol over an open flame
Why is there a bond between the ions in potassium chloride
Answer:
Explanation:
When the two atoms are in contact, potassium transfers its outer electron to chlorine which readily accepts it, resulting in both atoms achieving a state of eight outermost electrons. With this electron transfer, the ionic bond in KCl is formed.
Hope this helped!!!
Potassium has just one valence electron and Chlorine has 7 electrons, Chlorine needs just one atom to complete its octet which is provided by Potassium atom for formation of Potassium Chloride (KCl).
What is Chemical Bonding?Chemical bonding is the formation of chemical bonds present between two or more atoms or molecules which give rise to new compound. Bond is formed from electrostatic force present between oppositely charged ions like in ionic bonds or by sharing of electrons like in covalent bonds.
There are two types of Chemical Bonding:
1. Ionic Bonding
It is formed between opposite charged particles like Anion (negatively charged) and Cation (Positively charged) by the strong force of attraction.
For example, KCl formed by the ionic bond formation present between Potassium and Chlorine
2.Chemical Bonding
It is formed between two atoms for completing its octet by sharing of electrons.
For example, [tex]H_2[/tex] formed by sharing the electrons to complete its electronic configuration.
Thus, Potassium has just one valence electron and Chlorine has 7 electrons, Chlorine needs just one atom to complete its octet which is provided by Potassium atom for formation of Potassium Chloride (KCl).
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why can molar mass be used as a conversion factor
From the relative atomic mass of each element, it is possible to determine each element's molar mass by multiplying the molar mass constant (1 g/mol) by the atomic weight of that particular element. The molar mass value can be used as a conversion factor to facilitate mass-to-mole and mole-to-mass conversions.
Answer:
A substances molar mass is determined by increasing its relative nuclear mass by the molar mass constanttt (1 g/mol). So the molar mass consistent can be utilized to change mass over to moles. So by duplicating a given mass by the molar mass, the measure of moles of the substance can be determined.
Explanation:
From the general nuclear mass of every component, it is feasible to decide every component's molar mass by duplicating the molar mass steady (1 g/mol) by the nuclear load of that specific element.The molar mass worth can be utilized as a change factor to work with mass-to-mole and mole-to-mass transformations.
Brainliest?
The equation below shows the decomposition of lead nitrate. How many grams of lead (II) oxide are also produced when 20.5 g NO2 is formed?
Answer:
ligma
Explanation:
Calculate the work for the expansion of CO2 from 1.0 to 6.5 litres against pressure of 1.0 atm at constant temperature
Answer:
557.3J is the work of expansion of the CO2 gas
Explanation:
The work of expansion of a gas under constant temperature and pressure (Isobaric pressure) is:
W = P*ΔV
Where W is work
P is pressure = 1.0atm
ΔV = Final volume - Initial Volume = 6.5L - 1.0L = 5.5L
Replacing:
W = 1.0atm*5.5L
W = 5.5atmL
In Joules (1atmL = 101.325J):
5.5atmL * (101.325J / 1atmL) =
557.3J is the work of expansion of the CO2 gas
0.47 M KNO3 solution contains .757475 mol of KNO3 what is the volume
Answer:
Volume is the quantity of three-dimensional
Explanation:
Balance the following chemical equation by providing the correct coefficients.
[ ]Na+[ ]H2O -> [ ] NaOH + [ ]H2
Answer:
[2 ]Na+[2 ]H2O -> [ 2] NaOH + [1]H2
A nuclear power plant is used to generate:
steam
solar energy
heat energy
electricity
Answer:
Anuclear power plant is used to generate electricity
Answer:
Anuclear power plant is used to generate electricity
thank me later
Explanation:
I need answers to the lab report.
Answer:
Title.
Abstract.
Introduction.
Method.
Results and analysis.
Discussion.
Conclusion.
References.
This question is about acids and bases.
Which ion is found in all acids?.
CI-
H
Nat
OH-
Answer:
OH- is the correct answer
mark me brainst answer
Answer:
h
Explanation:
The common ion in all acids is the hydrogen or hydronium ion
Drugs change the chemical processes in what organ to cause addiction?
Answer:
the brain
Explanation:
drugs mainly affect the brain to keep the addiction going
Answer:
In pituitary gland addiction causes to drugs
Mark me as brainliest
Which of the following statements concerning double covalent bonds is correct?
They are found only in molecules that contain S or O.
S
They are found only in molecules that contain a coordinate covalent bond.
They occur on y between atoms containing 4 valence electrons.
They involve tie sharing of 2 electron pairs.
t
they involve tie sharing of 2 electrons pairs.
What are the FOUR major biogeochemical cycles upon which all life depends?
Answer:
Some of the major biogeochemical cycles are as follows: (1) Water Cycle or Hydrologic Cycle (2) Carbon-Cycle (3) Nitrogen Cycle (4) Oxygen Cycle. The producers of an ecosystem take up several basic inorganic nutrients from their non-living environment.
Explanation:
What test would be done to prove the color of specific compounds is due to metal ions apart from flame test
Answer:
Borax bead test
Explanation:
Another test that can be used to identify colored ions in a specific compound such as salt is called "Borax bead test".
This test involves use of a clear glassy bead of borax that is joined together in a wire loop which is going to be involved in chemical reaction with the salts of certain metals.
This reaction will produce colors that we can use to identify the exact metal ions that are present.
5. Make a graph: Plot your data on the graph to the right of the data table. Draw a line to conn points in order.
Answer:
i did c
Explanation:
Write a summary of the following Physical and Chemical Properties
Answer:
The physical properties of matter are those characteristics that can be measured without altering the atomic structure, while the chemical properties of matter are those characteristics that result in a change in the atomic structure.
25 points!! Will give Brainliest What is the molarity of the dilute solution if you dilute 35.0 mL of a 12.0 M solution to make 1000.0 mL of a solution?
Answer:
0.72 good luck with the answer
A
B
prevents different air masses from mixing.
a. Direction
b. Location
c. Density
d. Size
Answer:
c Density
Explanation:
I don'tknow if I am right if I am wrong correct me
Define a transverse wave
2.a. 3.26 g of iron powder are added to 80.0 cm3 of 0.200 mol dm-3 copper(II)
sulfate solution. The following reaction occurs: Fe (s) + CuSO4 (aq) → FeSO4 (aq)
+ Cu (s)Determine the limiting reactant showing your working. *
Your answer
Answer:
The limiting reactant is CuSO₄.
Explanation:
The reaction is:
Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s) (1)
To find the limiting reactant we need to find the number of moles of the reactants.
[tex] \eta_{Fe} = \frac{m}{A_{r}} [/tex]
Where:
m: is the mass of iron = 3.26 g
[tex]A_{r}[/tex]: is the standard atomic weight of iron = 55.845 g/mol
[tex]\eta_{Fe} = \frac{3.26 g}{55.845 g/mol} = 0.058 moles [/tex]
[tex] \eta_{CuSO_{4}} = M*V [/tex]
Where:
M: is the concentration of the CuSO₄ = 0.200 mol/dm⁻³
V: is the volume of the solution = 80.0 cm³
First, we need to convert the units of the volume to dm³ knowing that 1 dm = 10 cm and 1 L= 1 dm³.
[tex] V = 80.0 cm^{3}*\frac{1 dm^{3}}{(10 cm)^{3}} = 0.080 dm^{3} [/tex]
Now, the number of CuSO₄ moles is:
[tex] \eta_{CuSO_{4}} = M*V = 0.200 mol/dm^{3}*0.080 dm^{3} = 0.016 moles [/tex]
So, to determine the limiting reactant we need to use the molar ratio from equation (1), Fe:CuSO₄ = 1:1
[tex]\eta_{Fe} = \frac{1 mol Fe}{1 mol CuSO_{4}}*0.016 moles \: CuSO_{4} = 0.016 moles[/tex]
Since we need 0.016 moles of Fe to react with 0.016 moles of CuSO₄ and initially we have 0.058 moles of Fe, then the limiting reactant is CuSO₄.
Therefore, the limiting reactant is CuSO₄.
I hope it helps you!
The limiting reactant would be CuSO4
Looking at the equation of the reaction:
Fe (s) + CuSO4 (aq) → FeSO4 (aq) + Cu (s)
The mole ratio of Fe to CuSO4 is 1:1. Thus, every 1 mole of Fe will require 1 mole of CuSO4 for reaction.
Recall that: mole = mass/molar mass
Also: mole = molarity x volume
mole of Fe = 3.26/55.8
= 0.058 moles
mole of CuSO4 = 0.200 x 80/1000
= 0.016
The mole of Fe in the reaction is more than the mole of CuSO4. Thus, CuSO4 is the limiting reactant of the reaction. Fe is in excess.
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In the Eqn: [3 Fe + 2 O2 → Fe3O4], How many grams of Fe will be needed to react with 6.85 mol O2 ?
Answer:
575g
Explanation:
Mole ratio Fe : O2 = 3:2
so moles of Fe = 1.5 x 6.85 = 10.275 moles
mass=moles x Ar
Ar Fe= 56
mass = 10.275 x 56=575g