Answer:
answer is c
Explanation:
single replacement
How many moles are present in 2.45×10²³ molecules of CH4 ? Show your work!!!
The number of moles of CH4 present in 2.45 × 10²³ molecules is 0.41 moles.
How to calculate number of moles?The number of moles of a substance can be calculated by dividing the number of molecules by Avogadro's number.
no. of moles = no of molecules ÷ 6.02 × 10²³
According to this question, 2.45×10²³ molecules of CH4 are given. The number of moles is calculated as follows:
no of moles = 2.45 × 10²³ ÷ 6.02 × 10²³
no of moles = 2.45/6.02
no of moles = 0.41moles
Therefore, the number of moles of CH4 present in 2.45 × 10²³ molecules is 0.41 moles.
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_____H2 + _____O2 _____H2O
How many grams of water will you make from 7 moles of H2?
Answer:
126 g of H₂O
Explanation:
Firstly, we complete the equation:
2H₂ + O₂ → 2H₂O
If we have 7 moles of hydrogen, we assume, the oxygen is in excess.
Ratio is 2:2.
2 moles of hydrogen can produce 2 moles of water
Then, 7 moles of H₂ must produce 7 moles of water.
We convert moles to mass → 7 mol . 18 g/mol = 126 g
What relates moles of 1 substance to another in a chemical reaction?
Answer:
Chemical reactions list reactants and products in molar amounts, not just molecular amounts. We can use the coefficients of a balanced chemical equation to relate moles of one substance in the reaction to moles of other substances
Explanation:
How many mL of 0.10 M H₂SO₄, is
25.0 ml
50.0 ml
100 ml
150 ml
200 ml
Answer:
0.0025 moles H₂SO₄
0.0050 moles H₂SO₄
0.0100 moles H₂SO₄
0.0150 moles H₂SO₄
0.0200 moles H₂SO₄
Explanation:
The question is "How many MOLES..."
Molarity, M, is an unit of concentration in chemistry defined as the ratio between moles of solute and liters of solution. To solve this question we must find the moles of 0.10M H₂SO₄ in the volumes:
25.0mL:
0.025L * (0.10mol / 1L) = 0.0025 moles H₂SO₄
50.0mL:
0.050L * (0.10mol / 1L) = 0.0050 moles H₂SO₄
100.0mL:
0.100L * (0.10mol / 1L) = 0.0100 moles H₂SO₄
150.0mL:
0.150L * (0.10mol / 1L) = 0.0150 moles H₂SO₄
200.0mL:
0.200L * (0.10mol / 1L) = 0.0200 moles H₂SO₄
I need help with this question!!
Answer:
Fossil fuels..........
How many hydrogen atoms are present in an alkyne with 5 carbon atoms?
Answer:
cuatro
Explanation:
ino->4
Alkynes are triple bonded hydrocarbons. There are 7 hydrogen in an alkyne with 5 carbon atoms. This compound can be named as pentyne.
What are alkynes?Alkynes are hydrocarbons with one triple bond between two carbon atoms. alkynes are unsaturated compounds. Alkynes are named with the suffix 'yne' like ethyne, propyne etc..
There are three types of hydrocarbons namely, alkanes, alkenes and alkynes. Alkanes are saturated hydrocarbon having single bond between carbon atoms. Eg. methane , ethane etc all having suffix of 'ane'. Alkenes are unsaturated hydrocarbons with double bond between two or more carbon atoms.
Alkenes are named with the suffix 'ene'. Hence, the names become ethene, propene etc. The prefix for the names of hydrocarbons is based on the number of carbons. meth for 2, eth for 2 prop for 3, but for 4 and pent for 5 and so on.
The valency of carbon is 4 and it will bind to four other atoms. When it forms triple bond with a carbon it can bind to one hydrogen only. If it is a middle carbon then it dont have a hydrogen since either side will be carbons.
Thus for a 5 carbon alkyne, there will be total 7 hydrogens and the compound is pentyne.
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Which of the following chemical formulas represents a total of 12 atoms of oxygen?
3Sn(SO4)2
2Fe(NO2)3
4Cu3(PO4)2
2Cr(NO3)3
Answer:
3Sn(s04)2
Explanation:bc it cant be anything else
2Fe(No2)3
Explanation:
by multiplying 2×3 we get 6
then 2×6 so we get 12 atoms of o
How many grams are there in 3.26 x 10^25 Molecules of Mg(NO3)2?
Answer:
8025.996 grams are there in 3.26*10²⁵ Molecules of Mg(NO₃)₂.
Explanation:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 6.023*10²³ molecules are contained in 1 mole of the compound, 3.26*10²⁵ molecules are contained in how many moles of the compound?
[tex]amount of moles=\frac{3.26*10^{25}molecules*1 mole }{6.023*10^{23}molecules }[/tex]
amount of moles= 54.12
Molar mass is the mass of one mole of a substance, which can be an element or a compound. Being the molar mass of the compound Mg(NO₃)₂ 148.3 g/mole, so 54.12 moles of the compound contains 8025.996 grams.
8025.996 grams are there in 3.26*10²⁵ Molecules of Mg(NO₃)₂.
Weathering and erosion are the only
processes that work together to change
our environment and landforms.
true
false
Answer:
false
Explanation:
there are more than 2 forces of nature that change the environment and landforms
A liquid-fueled rocket engine has two liquids, usually called the fuel and the oxidizer. Which two liquids are most commonly used for this propellant?
Answer:
A liquid-fueled rocket has two liquids (liquids are good because of the density, they need less space than a gas to be stored), such that these liquids are called the fuel and the oxidizer.
These liquids are injected into a system that leads to a combustion chamber, where the liquids are mixed (we need to mix the fuel with the oxidizer to enable the combustion of the fuel) and burned to produce thrust.
Some common examples of oxidizers are liquid oxygen, which may be combined with fuels like liquid hydrogen, liquid methane, kerosene and hydrazine.
Other oxidizers are liquid fluorine (which also can be combined with the fuels liquid hydrogen and hydrazine), nitrogen tetroxide (which can be combined whit kerosene, hydrazine and other fuels) and FLOX-70, which can only be combined with kerosene.
The "most commonly used" may depend on the country and the type of liquid propellant ( petroleum, cryogens, and hypergols)
Such that the most common oxidizer may be liquid oxygen, and the most common fuel the kerosene.
why sodium chloride is a poor conductor of electricity in solid state?
Answer:
Because the electrons in this ionic compound arent free to move and so cannot carry charge. For an iconic compound to conduct electricity it must be a liquid, either in a molten form or dissolved in water.
Explanation:
Is this clear?
what volume of 0.5 HCL contains 10 moles of HCL
Answer:
20L
Explanation:
molar concentration = moles of solute ÷ volume of solution
⇒ 0.5 = 10 ÷ volume
⇒ volume = 10 ÷ 0.5 = 20L
Answer:
Explanation:
moles = mass/molar mass
10 = mass/(1.016 + 35.453)
10 = mass/ 36.469
36.469 * 10 = mass
3646.9 g = mass
molarity = moles/volume
0.5 = 3646.9/volume
0.0001371 = volume
OP
An increase in concentration (or pressure) increases rate of reaction
because...
B: the collision frequency is increased
A the arvaton energy is increased
D. All of these
there are more unsuccessful
collisions
Represente lo que ocurre mediante flechas cuando dos cargas negativas, dos cargas positivas y una carga positiva y otra negativa se acercan Es urgente
Answer:
Neutral.
Explicación:
Cuando dos cargas negativas, dos cargas positivas y una carga positiva y una carga negativa se unen, los átomos se vuelven neutrales porque las cargas opuestas cancelan el efecto de la otra. Si hay igual número de cargas y además son opuestas entre sí, entonces todas estas cargas cancelan el efecto de la otra formando el átomo neutral, pero si hay diferencia en el número de cargas, entonces la carga que es alta en número aparece en el átomos.
Competition is rivalry between individuals for a particular resource.
Question 1 options:
True
False
Answer:
True
Explanation:
Competition is the act of competing with one another for a particular resource. An example is two animals quarrelling over a food or two people quarreling over who lost their money. Competing is a type of rivalry in which two people compete for one resource. The answer for this question is True.
The answer is TRUE. Competition is rivalry between individuals for a particular resource
Competition amongst individuals?
Competition can be described as an interaction between two individuals in which they both fight for the available resources in the environment.
For example, when there is limited source of food and water in an environment, the individuals or organisms present will struggle to take the available food in order to survive while those individuals that were unable to get this resource might end up dead as the available food is limited.
This also occurs in plants and they also compete for sunlight, food, water.
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is the answer A or B?
Answer:
Letter DHope I helped!♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥ ♥
1.What phase change is being observed when ice melts? *
2. What phase change is being observed when water droplets are found outside the glass of a cold water?
3. When dry ice (CO2) is placed on top of the table, after couple of minutes there is no dry ice left. What kind of phase change is it?
4. How do we classify the phase changes in matter if we put water in the freezer of the refrigerator?
Answer:
1 melting
2
3 evaporationa
4 freezing point
The phase of the following are:
1. Melting.
2. Condensation.
3. Evaporation
4. Freezing point.
What is melting?When any substance change from solid state to liquid state, it is called melting.
Ice change into water is an example.
What is condensation?Condensation is a process in which the air is cool down and convert into liquid from, like dew.
Water drops outside cold water bottle is an example.
What is evaporation?Evaporation is the opposite of condensation, in which the liquid become so hot that it change into gaseous form.
Water turns into vapor in hot temperature.
What is freezing point?Freezing point is when liquid is converted into solid.
Water converted into ice in fridge is an example.
Thus, The phase of the following are:1. Melting., 2. Condensation., 3. Evaporation., 4. Freezing point.
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What happens when a liquid becomes a gas?
A. It changes shape and volume
B. It changed volume but not shape
C. It changes shape but not volume
D. Nothing happens
Answer:
A It changes shape and volume
Explanation:If a liquid turns into a gas it starts to change shape since they are not the same
Answer:I believe it’s A
Explanation:when a liquid turns into a gas it the volume increases of the substance and of course the shape changes
The Alliance to Save Energy seeks to increase energy efficiency through _______.
a.
petitioning consumers to change their habits
b.
lobbying for policy changes
c.
reducing greenhouse gases
d.
increased spending on consumer goods
Please select the best answer from the choices provided
A
B
C
D
Answer:
B.) Lobbying for policy changes
The Alliance to Save Energy seeks to increase energy efficiency through lobbying for policy changes and the correct option is option B.
What is Alliance to Save energy?The Alliance to Save Energy (ASE) is a nonprofit organization formed by industrial, technological, environmental and consumer leaders. It promotes energy efficiency across the world through research, education and advocacy.
Their mission is to improve energy productivity by:
Leading bipartisan initiatives that drive technological innovation and energy efficiency across all sectors of the economy, through policy advocacy, education, communications, and research.Convening and engaging in diverse public private partnerships, collaborative efforts and strategic alliances to optimize resources and expand our sphere of influence.Therefore, The Alliance to Save Energy seeks to increase energy efficiency through lobbying for policy changes and the correct option is option B.
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Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.Which statement best describes these three components of air?They are all classified as pure substances.They cannot react with another substance.They are chemically bonded to one another.They can be classified as elements.
Answer:
The three components of air are all classified as pure substances since they are not chemically bonded so they can be separated by certain processes and be present as a pure substance.
Explanation:
The components of air are all pure substances, the correct option is A.
What are Pure Substances?A pure substance is a single type of matter that cannot be physically divided into other types of matter.
A pure substance has a known and consistent composition at all times.
A physical combination of two or more pure chemicals that maintain each substance's unique chemical identity is referred to as a mixture.
A pure material exists as a distinct entity. Mixtures are not pure substances, but elements and compounds are.
The characteristics of the mixture are sort of an average of the characteristics of the constituent ingredients.
The ingredients that make up a compound are substantially distinct from one another. However, a blend resembles the constituent parts.
Air is made up of different gases, such as oxygen, nitrogen, and carbon dioxide.
Air is a mixture of oxygen, nitrogen, and carbon dioxide, which are pure substances.
The statement that best describes the components of air is that they are all pure substances.
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Please Answer all 4 questions and i will give brainliest!
You haven't added the 4 questions, so when you upload them, i'll answer.
Give me an example of electrons. in your own words.
Answer:
Electrons are the negative particles that are part of an atom
Explanation:
It’s short sorry
What is the source of solar energy? electricity . solar panels the sun None of the above
Answer:
The Sun
Explanation:
Solar power is energy from the sun that is converted into thermal or electrical energy.
Answer:
The sun
Explanation:
The sun is the main source of solar energy.
5 개의 kpop 노래 쓰기
너희들은 나를 도울 수 있습니까?
Answer:
que es eso?
Explanation:
Answer:
[tex]\huge\colorbox{violet}{✏﹏ \: K-POP \: Songs \:}[/tex]
✏ Dynamite (BTS)
✏ Pretty Savage (BlackPink)
✏ Life Goes On (BTS)
✏ On The Ground (Rosé)
✏ Lovesick Girls (BlackPink)
✏ Wannabe (ITZY)
✏ I Can't Stop Me (Twice)
✏ Growl (EXO)
Butter - BTS (곧 출시 될 예정입니다)
who discovered electron
Answer: Electricity
Answer:
J.J Thomas in 1897
Which best describes global CO2 emissions?
O A. The amount of CO2 released by humans has increased over the
last 200 years.
B. There are no fuels that release CO2 when burned.
C. Humans have reduced the amount of CO2 in the atmosphere.
D. Humans have stopped releasing CO2 into the atmosphere.
Which best describes global cO2 emission
Answer:
The amount of CO2 released by humans has increased over the
last 200 years.
Hope it helps!!!
Answer:
A. The amount of CO2 released by humans has increased over the
last 200 years.
What is reproduction?
Which of the following effect increases the solubility of Ca(OH)2?
O Adding an acidic solution
O Adding KOH
O Adding solid CaCl,
O Adding solid NaOH
O Adding CaCO3
Answer:
adding an acidic solution
Explanation:
Strong acids dissociate completely in water and the H⁺ ions react with the OH⁻ ions to make H₂O. If we add an acid to our solution of Ca(OH)₂, the acid protons would react with some of the OH⁻ ions and drive the equilibrium to the right. More of the solid Ca(OH)₂ should dissolve.
Which of the following is not a reason for extinction?
a change in climate
a change in predation rate
the ability to breed successfully
loss of habitat
Answer:
the ability to breed successfully
Explanation:
Answer:
the ability to breed successfully
Explanation:
the more offspring's an organism has, the less chance of extinction would happen. I hope that helped bestie
As a result of additional carbon dioxide in the atmosphere diffusing into the oceans, the water has become acidified. This is an example of:
Answer:
Ocean acidification
Explanation:
Ocean acidification is the progressive decrease in the pH of the oceans on Earth as the increasing amount of carbon dioxide CO₂ in the atmosphere which is due mainly to fossil fuel combustion, is dissolved into the oceans
Carbonic acid is formed when carbon dioxide, CO₂, in the atmosphere is dissolved in the ocean water to form carbonic acid as follows;
CO₂ + H₂O → H₂CO₃
H⁺(aq) ⇄ HCO₃⁻ (aq)
According to L e C h a t e l i e r ' s an increase in the amount of carbon dioxide in the atmosphere will result in more CO₂ dissolving into the oceans and forming more carbonic acid, HCO₃⁻ (aq), thereby increasing the acidity of the oceans which is equivalent to a reduction in the pH of the ocean waters.