Answer:
C. Alchemy is not scientific, but chemistry is based on evidence.
Explanation:
Alchemy was based on mystical beliefs instead of the scientific method.
Chemistry is the study of matter and change based on evidence.
Which statement about acids is true?
a) Weak acids have a pH of less than 2.
b) The pH value of acids can only be measured in aqueous form.
c) The stronger the acid, the higher the pH value.
d) Strong acids have a low percent ionization.
Answer:
weak acids have a pH of less than 2
4. A chemical reaction has the equation 2NaCl (aq) + F2 (g) + 2NaF (s) + Cl2 (g). What type of reaction occurs between NaCl and F2?
A. Double displacement
B. Single displacement
C. Synthesis
D. Decomposition
A chemical reaction has the equation 2NaCl(aq) + F₂ → 2NaF(s) + Cl₂ (g). The reaction type occur between NaCl and F₂ is Single displacement.
Hence, Option (B) is correct answer.
What is a Chemical reaction ?A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.
Now lets check all options one by one
Option (A): Double displacement
A double displacement is a chemical reaction in which elements are exchange between the two compounds. In the given reaction F₂ is not a compound. so this reaction cannot occur
Hence, option (A) is incorrect.
Option (B): Single displacement
A Single displacement reaction is a chemical reaction in which one element replaces the another element in a compound.
In the given reaction F₂ element replaces with the element Na in a compound NaCl. So this reaction occur.
Hence, option (B) is correct.
Option (C): Synthesis
A synthesis reaction is a chemical reaction where two or more substances react to produce a new compound.
In the given reaction two products are formed NaF which is a compound and Cl₂ which is element. So this reaction cannot occur.
Hence, option (C) is incorrect.
Option (D): Decomposition
A decomposition reaction is a chemical reaction in which one reactant breaks down to form a two or more products.
In the given reaction two reactants are given NaCl and F₂. So this reaction cannot occur.
Hence, option (D) is incorrect.
Thus, from above conclusion we can say that The reaction occurs between NaCl and F₂ is single displacement reaction.
Hence, Option (B) is correct answer.
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Calculate the number of moles in each of the following:
a. 82.0 g of Ag
b. 0.288 g of C
c. 15.0 g of ammonia, NH3 d. 7.25 g of CH4
e. 245 g of Fe2O3

Answer:The mole, symbol mol, is the SI base unit of amount of substance. The quantity amount of substance is a measure of how many elem
Explanation:
In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best
describes what occurred?
A. Energy was added, so the reaction is endothermic.
B. Energy was added, so the reaction is exothermic
C. Energy was released, so the reaction is exothermic.
D. Energy was released, so the reaction is endothermic.
Answer:
Energy was added, so the reaction is endothermic.
Explanation:
Answer:
A. Energy was added, so the reaction is endothermic
Explanation:
For each of the esters provided, identify the alcohol and the carboxylic acid that reacted.
52. Methyl propanoate+_________
53. Ethyl methanoate+__________
Answer:
52. The alcohol USED => methanol, CH3OH
The carboxylic acid USED => propanoic acid, CH3CH2COOH.
53. The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
Explanation:
52. To obtain Methyl propanoate, CH3CH2COOCH3, we simply react propanoic, CH3CH2COOH and methanol, CH3OH together as shown below:
CH3CH2COOH + CH3OH —> CH3CH2COOCH3 + H2O
The alcohol used: methanol, CH3OH
The carboxylic acid used: propanoic acid, CH3CH2COOH.
53. To obtain Ethyl methanoate, HCOOCH2CH3, we simply react
Formic acid, HCOOH and ethanol, CH3CH2OH together as show below:
HCOOH + CH3CH2OH —> HCOOCH2CH3 + H2O
The alcohol USED => Ethanol, CH2CH3OH
The carboxylic acid USED => Formic acid, HCOOH.
The correct name for molecule I is
Molecule I
I
|
CH3-CH-CH3
a. Iodopropane
b. 2-iodylpropane
c. 2-iodopropane
D. Propyliodine
14. The correct name for molecule III is
Molecule III
F
|
C= CH
——-
a. 2-Fluoroeth 1-yne
b. Fluoroethyne
C. Fluoroethene
D. Methylfluorine
16. Synthetic chlorinated hydrocarbons such as dioxins and furans are usually greater pollution hazard then natural organic substances because synthetic hydrocarbons are
a. More volatile
b. Less water soluble
C. Less Biodegradable
D. More chemically reactive
Question 17.
Sources of pollutants
1. High temperature combustion
2. Pulp and paper industry
3. Pesticides
4. Sour gas plants
Match each source of pollutant as numbered above with its pollutant as listed below. Use each number only once
17. Dioxins/furans
18. SO2(g)
19. Nox(g)
20. Phosphates
Answer:
c). 2-iodopropane
14) C). Fluoroethene
16) D). More chemically reactive
17) 1). High temperature combustion - Dioxins/furans
2). Pulp and paper industry - SO2(g)
3). Pesticides - Phosphates
4). Sour gas plants - Nox(g)
Explanation:
The correct name for molecule I would be '2-iodopropane' where the number 2 reflects the position of iodine. There are three carbons and 8 hydrogen atoms which reflect that it is an alkane compound. In the given carbon chain. In this chain of three carbons, iodine is present on the second carbon. Therefore, option C is the correct answer.
14). The appropriate name for molecule III exemplifies Fluoroethene as it consists of two carbons due to which it belongs to the 'ethane' group and it bears the prefix 'fluoro as it belongs to fluorine group and the suffix '-ene' due to double bond.
16). Synthetic hydrocarbons are 'more chemically reactive' and therefore, it generates greenhouse gases and leads to climate change, global warming, depletion of the ozone layer, etc.
17). 1). Dioxins are generated as a result of high-temperature combustion processes like commercial waste incineration or burning of fuels.
2). Pulp and paper industry releases various gases like nitrogen oxide, sulfur dioxide SO2(g), carbon dioxide, etc.
3). Phosphate is the pollutant released from pesticides that badly affects the fertility of the soil.
4). Nox(g) nitrogen oxide released by sour gas plants and coal-fired emissions is a major contributor to increased greenhouses gases and global warming.
Bromine water was added dropwise to test tubes containing aqueous solutions of bromide, chloride, and iodide. lodide was oxidized to iodine; bromide and chloride gave no reaction Arrange Br 2 ,Cl 2 ,I 2 in order of their strength as an oxidizing agent.
Answer:
Cl₂ > Br₂ > I₂
Explanation:
An oxidizing agent gains electron for itself by removing electrons from other reactants during a reaction. Oxidation is the loss of electrons. Chlorine can take electron from bromine and chlorine while bromine can take electron from iodine, therefore chlorine is a more oxidizing agent than bromine and iodine while bromine is a more oxidizing agent than iodine.
Oxidizing ability decreases down the group.
Therefore Cl₂ > Br₂ > I₂
Consider the combustion of butane: 2C4H10(g) + 1302(g) ===> 8CO2(g) + 10H2O(1)
If you want to produce 120 moles of carbon dioxide (CO2), who many moles of butane would you need
to react?
A. none are correct
B. 195 moles
C. 150 moles
D. 30 moles
E. 480 moles
Given the following equation: 2 KCIO, 2 KCI + 3 Oz, how many grams of Oz can
be produced by letting 8.00 moles of KCIO, react?
Answer : The mass of [tex]O_2[/tex] produced is, 384 grams.
Explanation : Given,
Moles of [tex]KClO_3[/tex] = 8.00 mol
First we have to calculate the moles of [tex]O_2[/tex]
The balanced chemical equation is:
[tex]2KClO_3\rightarrow 2KCl+3O_2[/tex]
From the reaction, we conclude that
As, 2 moles of [tex]KClO_3[/tex] react to give 3 moles of [tex]O_2[/tex]
So, 8.00 mole of [tex]KClO_3[/tex] react to give [tex]\frac{3}{2}\times 8.00=12[/tex] mole of [tex]O_2[/tex]
Now we have to calculate the mass of [tex]O_2[/tex]
[tex]\text{ Mass of }O_2=\text{ Moles of }O_2\times \text{ Molar mass of }O_2[/tex]
Molar mass of [tex]O_2[/tex] = 32 g/mole
[tex]\text{ Mass of }O_2=(12moles)\times (32g/mole)=384g[/tex]
Therefore, the mass of [tex]O_2[/tex] produced is, 384 grams.
the sun is 73% hydrogen and 25% helium the rest is other elements what is the percentage of other elements in the sun
Answer:
12%
Explanation:
What factors influence the absorption of sunlight at Earth's surface
Answer:
Solar elevation.
Ozone.
Cloud cover.
Ground surface reflectivity.
Altitude.
Aerosols and pollutants.
Direct and diffuse UV.
I'm not sure if this was what you were looking for, but if it helps please mark me as brainliest.
What qualifications do you need to be a research scientist?
A. High IQ
B. College degree
C. High school diploma
D. Ph.D
Answer:
Ph.D
Explanation:
For the most part, research scientists need a bachelor's degree in a highly associated field. A master's degree or a doctorate is frequently expected.
Which process is based on repulsion of oil and water?
Answer:
We can seprate oil and water by the process of seprating funnel
How many moles of Al would be produced from 12.85 moles of Al2O3?
Al2O3 → AL + O2
Select one:
O a. 25.7
O b. 6.43
O c. 19.3
d. 8.61
PLEASE HELP ME
The table shows the atomic number of four atoms.
Which one is NOT a metal?
Answer:
A. Argon
Explanation:
Argon is a nonmetal. It is a noble gas with an atomic number of 18.
Based on the periodic table of chemical elements, the atom which is not a metal is the atom with an atomic number (number of protons) of 18.
Given the following data:
Number of protons = 18Number of protons = 19Number of protons = 19Number of protons = 20An chemical element can be defined as a pure substance which is made up of atoms that are having the same atomic number (number of protons) in its atomic nucleus.
This ultimately implies that, an atomic number is equal to the number of protons in the nucleus of an atom of a chemical element.
In Chemistry, the following chemical elements have this atomic number:
Argon = 18 = 2:8:8Potassium = 19 = 2:8:8:1Calcium = 20 = 2:8:8:2Note: Both group 1 and 2 chemical elements are metals.
However, an atom with an atomic number of 18 is in group 8 of the periodic table and as such isn't a metal but a noble gas.
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Scientific evidence shows that Earth's diameter, and thus overall size, does
not change. This evidence goes against which two theories?
A. Expanding Earth
B. Plate tectonics
O c. Contracting Earth
D. Continental drift
U
SUBMIT
Answer:
The evidence goes against A. Expanding Earth and B. Contracting Earth
Consider preparing ammonia gas by the following reaction:
N2(g) + 3H2(g)
===>
2NH3(g)
If you have 28.02 g of N2 and excess H2, how many grams of NH3(g) can be produced.
6.06 g
14.01 g
34.08 g
68.16 g
28.02 g
Answer:
34.08 g
Explanation:
Take the atomic mass of N=14.0, H=1.0/
no. of moles=mmass/molar mass
no. of moles of N2 used = 28.02 / (14x2)
=1.0007mol
From the equation, the mole ratio of N2 : NH3 = 1: 2,
so one mole of N2 produces 2 moles of NH3.
Using this ratio, we can deduce that the no. of moles of NH3 = 1.0007x2
= 2.001428mol
mass = no. of moles x molar mass
Hence,
mass of NH3 produced = 2.001428 x (14+1x3)
= 34.03
≈C
In this molecule, what's the formal charge on the central O atom?
A. -1
B. -2
C. 0
D. +1
In water, oxygen is covalently bonded to two hydrogen atoms. Oxygen has the formal charge of zero and hydrogens also has the formal charge of zero.
What is formal charge ?Formal charge of an atom is the charge it possess in a compound. The formal charge of an atom is found out from its valence electrons, lone pair of electrons and bond pairs.
The equation of formal charge is written as follows:
Formal charge = Valence electrons - (Lone pair + bond pair)
In water, oxygen covalently bonds to two hydrogen atoms. The bond pair of electrons from oxygen is 2.
number of valence electrons in oxygen = 6
no.of lone pairs = 4
Then FC = 6 - (4 + 2) = 0
Therefore, the formal charge of oxygen in water is zero.
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50 Points for whoever does it and shows their work. Maya has four glasses of milk. The temperature and the amount of milk in each glass are shown: Glass A: 20 grams of milk at 10 °C Glass B: 50 grams of milk at 80 °C Glass C: 20 grams of milk at 50 °C Glass D: 50 grams of milk at 80 °C Which statement is correct?
Answer:
A. 20 grams of milk at 10°C
Explanation:
Since we refrigerate milk, it would be cooler than the room temperature, which standard norm is 25°C. So the milk has to be colder than the room temperature. Therefore, our answer is A.
Answer: A is the correct answer
Explanation:
The temperature of room temperature is more than that and you need to keep it colder, hope this helped!
which three events occur when earths convection currents move toward each other
Answer:
Option A, Tectonic plates above the currents move toward each other.
Option C, One plate will submerge beneath another plate.
Option D, A convergent boundary is formed at the site of the collision.
Explanation:
The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.
Answer:
- Tectonic plates above the currents move toward each other;
- One plate will submerge beneath another plate;
- A convergent boundary is formed at the site of the collision;
The convection currents are the ones responsible for the movement of the tectonic plates, thus shaping the Earth's appearance with their movement, as well with the structures created by the movement. If the convection currents move toward each other, than the tectonic plates are moving toward each other. That will cause collision between the continents, and convergent boundaries will be formed. If the collision is between two or more continental plates, than they will merge, and from the pressure mountain ranges will start to form, but if there an oceanic plate involved as well, than the oceanic plate will be subducting beneath the continental plate or plates.
Which state of matter is characterized by ionized particles, no definite shape or volume, and good electrical conductivity? gas liquid plasma solid
Answer: Plasma
Explanation: Plasma is the state of matter where the substance is ionized and has no definite shape or volumen. The fact of being ionized makes the substance a good electrical conductor.
Hope it helps.
Matter generally exists in three physical states, namely solid, liquid and gaseous states. The three states mainly differ in the arrangement of particles and the force of attraction among the constituent particles. Here plasma is characterized by ionized particles. The correct option is C.
What is plasma?Plasma is a hot ionized gas which contains equal numbers of positively and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that it is considered as the fourth state of matter.
Since plasma are made up of electrically charged particles, they are strongly influenced by electric and magnetic fields while neutral gases are not. Like gases plasmas have no fixed shape or volume and are less dense than solids or liquids.
Plasma is a superheated matter, so hot that the electrons are ripped away from the atoms forming ionized gas. It comprises over 99% of the visible universe.
Thus the correct option is C.
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How many grams of water are produced when 2.50 mol oxygen reacts with hydrogen?
H2 + O2 + H2O
Select one:
a. 45.0 g
b. 22.5 g
c. 90.0 g
O d. 3.6 g
PLEASE HELP
Answer:
it is 90.0
Explanation:
A group in the periodic table has the same
A. number of protons.
B. number of neutrons.
C. number of outer shell electrons.
D. shell number.
Hey there! :)
Answer:
C. Number of outer shell electrons.
Explanation:
Groups consist of the vertical columns of the periodic table, such as 1A, 2A, etc. (Not including transition metal groups) which depict the number of valence electrons, or the number of electrons in the atom's outer shell.
For example, Oxygen, which is in group 6A, contains 6 valence (outer shell) electrons.
Answer:
number of outer shell electrons.
Explanation:
Which one has a greatest mass, one atom of carbon, one atom of hydrogen, or one atom of litium
Sugar can be converted to carbon dioxide and water by burning in air or by metabolic reactions inside living cells. How are these reactions similar and how are they different?
Answer:
These reactions are similar because the process is similar and the products are carbon dioxide they are different because the substances are different to outgo these reactions
Explanation:
Heat is a measurement of temperature change. TRUE or FALSE
Answer:
i think its false because heat is defined as the sum of kinetic enegry present in the molecules of substances.
In the reaction Ca + Cl2 → CaCl2, what is the mole ratio of chlorine to calcium chloride?
Select one:
O a. 2:3
O b. 2:1
O c. 1:2
O d. 1:1
PLEASE HELP ME
Answer:
D. 1:1
Explanation:
For every 1 mole of chlorine (Cl₂), there is one mole of calcium chloride (CaCl₂).
So, the mole ratio of chlorine to calcium chloride is 1:1.
Hope this helps. :)
The mole ratio of chlorine to calcium chloride in the given chemical reaction is 1:1.
What is the stoichiometry?Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.
Given chemical reaction is:
Ca + Cl₂ → CaCl₂
From the stoichiometry of the given reaction it is clear that,
1 mole of chlorine = reacts with 1 mole of calcium chloride
So, mole ratio = Chlorine / calcium chloride = 1:1
Hence required mole ratio is 1:1.
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Which factor will increase a population's size?
Answer:
The two factors that increase the size of a population are natality, which is the number of individuals that are added to the population over a period of time due to reproduction, and immigration, which is the migration of an individual into a place.
procedure to find out if the penny is real copper with copper wire
Answer:
Four ways to test a copper penny are given below:-
Explanation:
Firstly, take a quick look only at the color of the penny. Zinc pennies may appear patchy, irregular whereas copper-gold coins may seem more probable to be orange or even chocolate. Secondly, drop your penny on the floor and hear the noise it's making. The copper penny would have a "started to ring" sound in this situation, whereas the zinc penny should "clunk." Third, you can weigh the centimeter. You'll need an accurate scale weighing in grams. The penny of copper will weigh 3.11 grams while the penny of zinc weighs 2.5 grams. In the end, look at the date. If your penny was taken out of circulation before 1982, 95 percent copper and 5 percent zinc will be made. Beginning in 1982, pennies had just 2.5 percent copper and 97.5 percent zinc in them. Pennies from any of the two formulations made in 1982 may be produced.
How did the change of stress (adding or removing reactants or products) cause a shift in the equilibrium system of your solutions? Use data to support your answer. Make sure you discuss all four stress changes: Adding a reactant Adding a product Removing a reactant Removing a product
Answer:
When reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. When a product is added, the equilibrium moves in order for reactants to reduce the stress.
Explanation:
:)
It should be noted that when a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product.
It should be noted that a reactant simply means a substance that takes part in a chemical reaction to form products.
When a reactant is added, the equilibrium moves in order to reduce this stress which then makes more product. Also, when a product is added, the equilibrium moves in order for reactants to reduce the stress. This is vital for the reaction.
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