Answer:
Volume of 10M HCl containing 4 moles HCl = 400 ml
Explanation:
Molarity x Volume (L) = moles
10M·V = 4 moles HCl
V = 4moles/10Molar = 4moles/10moles/Liter = 0.40L = 400ml
A product's price will increase the most if:
A. its supply and demand both fall at the same rate.
B. its supply declines while its demand goes up.
C. its demand remains the same but its supply goes up.
D. its supply remains
the same but its demand goes down.
Assuming a constant temperature, which sample below would you expect to be at
the highest pressure?
A
B
С
ОА
B
Ос
Answer:
The answer is C
Explanation:
This is pretty obvious, considering. Since they all are the same temperature and have the same amount of molecules, the place with the smallest amount of space has the highest amount of pressure. Because there is so little space, there is so much more pressure.
Does anyone know if this is correct?
Answer:
try 76.35 or d didi in the back of the STREETS of the city girls are the same time as hell
How many molecules of HCl would react with 2 moles of Al?
2Al + 6HCl → 2AlCl3 + 3H2
Answer:
3.612 × 10^24 molecules
Explanation:
The balanced chemical equation in this question is given as;
2Al + 6HCl → 2AlCl3 + 3H2
Based on the equation, 2 moles of Aluminum (Al) is needed to react with 6 moles of HCl
Since 1 mole of a substance is equal to 6.02 × 10^23 molecules;
This means that, according to the question, 6 moles of HCl needed to react with 2 moles of Al will contain;
6 × 6.02 × 10^23 molecules
= 36.12 × 10^23
= 3.612 × 10^24 molecules
In a nutshell, 3.612 × 10^24 molecules of HCl would react with 2 moles of Al.
Answer:
1.806 × 10^24
Explanation:
Which of the following is a property of bases in aqueous solutions?
A. They reacts with metals to produce hydrogen gas.
B. They taste sour.
C. They increase the concentration of H+ ions.
D. They decrease the concentration of H+ ions.
A force of 5000 newtons is applied to a 1200 kg car at rest. What is its acceleration?
HELP ASAP Will Give Brainlist
The correct answer is actually
D. requires a lot of energy to become hot.
As the definition of specific heat is "the heat required to raise the temperature of the unit mass of a given substance by a given amount."
Post- Assessment:
Multiple Choice. Choose the letter of the best answer. Write the chosen letter on a separate sheet of paper.
1. Abiotic factors are
A. factors of atmosphere which affect life
B. chemical factors of soil which affect life
C. mechanical factors of soil which affect life
D. all non-living factors that sustain the living organisms
2. Which factor is responsible for poor vegetation in deserts?
A. low rainfall C. native mankind
B. poor sunlight D. grazing by animals and goats
3. When Sammi came in from a weekend away she noticed that all of the fish in her aquarium were dead. Which of the following most likely caused this?
A. The light caused the fish to stay to the bottom.
B. The temperature fell and the dissolved oxygen went down.
C. The temperature was very high and the dissolved oxygen decreased.
D. The temperature was very high and the levels of dissolved oxygen went up.
4. When there is a lot of pollution, rain can be acidic, harming plants and animals. What is this an example of?
A. a mutualistic type of symbiosis
B. an individual affecting a community
C. an abiotic factor affecting an ecosystem
D. competition between a population and a community
5. Which is an example of an abiotic element changing an area?
A. Introducing a new type of grass C. Water flooding the area
B. Two species of birds competing D. Algae growing on crabgrass
6. Which of the following would be an abiotic limiting factor for oysters living in Talaba, Bacoor?
A. The amount of algae
B. The number of parasites
C. The number of human collecting them
D. The amount of sediment in the water
7. Which of the following correctly represents an abiotic factor as the cause of a disease?
A. Ringworm - due to a fungal growth on the skin
B. Diarrhea - due to bacteria present in drinking water
C. Food poisoning - due to bacteria present in food and water
D. Arsenicosis - due to heavy metal arsenic residues present in drinking water
8. Temperature is an abiotic factor of an ecosystem because
A. It has almost no mass
B. It can move from one place to another.
C. It lacks all the characteristics of a living thing.
D. It is required for the survival of many organisms.
9. How do organisms return nutrients and water to the environment?
A. By cycling between temperature and moisture.
B. By cycling between evaporation and transpiration.
C. By cycling between the flora and fauna of the Earth.
D. By cycling between the abiotic and biotic environment.
10. Which of these phrases describes the abiotic factors of an ecosystem?
A. an environmental factor that tends to limit population size
B. the nonliving physical or chemical conditions of an environment
C. a species that lived in one place but that has moved to a new geographic location because of human interference
D. the complete process by which habitat loss results in the division of large, continuous habitats into a greater number of smaller patches of lower total area
11. During a long period when there is no rainfall, a mountain lion may temporarily leave its usual hunting territory to drink from a farm pond. This behavior is due to
A. its need to find a new habitat
B. its need to find different foods to eat
C. the change in a biotic factor in its environment
D. the change in an abiotic factor in its environment
12. Which is an example of how biotic and abiotic factors interact?
A. Humidity in the air forms fog in a valley.
B. Water and soil mix together to make mud.
C. Tree roots split apart rocks in the ground.
D. Sunlight increases the temperature of pond water.
13. Which is the main causative factor of desertification?
A. tourism C. irrigated agriculture
B. overgrazing D. developmental activities
14. Habitats are affected by environmental factors. Which one of the following factors is most unlikely to affect a habitat?
A. The soil type of the habitat.
B. The number of times it is photographed.
C. Competition between plants in the habitat.
D. The weather most prevalent in the habitat.
15. Which one of the following statements is incorrect?
A. Animals need plants as a source of food.
B. Plants depend upon animals for food and shelter.
C. Plants rely on animals to help them scatter their seeds.
D. Bacteria and fungi help plants to return minerals to the soil.
Answer:
the answer is C
I just took the test
Explanation:
❤♥♥❤♥♥
What are examples of physical properties of substance? Select all that apply. A Solubility B Odor C Color D Flammability
Solubility, odor, and color are physical properties; they can all be discerned without having to subject a substance to a chemical change. Flammability, on the other hand, is a chemical property. Thus, choices A, B, and C would be correct examples of physical properties.
True or False: Different substances, like shortening and soap, will melt at the same temperature. True False
Answer:
false
Explanation:
different things will have different melting points
PLSSS HELP
How is a balanced chemical reaction, like N2 +
3H2 --> 2NH3, similar to a recipe?
Answer: With each input, there is an output, a recipe requires certain ingredients, and certain amounts of each. A recipe calls for measurements, missing something can ruin it, just like a chemical formula, take something out or add something else, you get something completely different. when putting things together to make something you have to make sure what your putting in, will give you the product you want as the output.
Explanation:
Identify the elements that make up water and ozone .Name the element common between the two molecules .
Answer: Water is made up of elements hydrogen and oxygen. Ozone is made up of element oxygen. The common element between them is oxygen.
Explanation:
Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions.Example: Hydrogen (H)
Water and ozone are compounds which are formed by the combination of elements in fixed ratio by mass.Water and ozone have molecular formulas of [tex]H_2O[/tex] and [tex]O_3[/tex] respectively.Water is made up of elements hydrogen (H) and oxygen (O). Ozone is made up of element oxygen (O).
Thus the common element between them is oxygen (O).
PLEASE HELP
which subatomic particle identifies the element?
A. atomic mass
B. neutrons
C. protons
D. electrons
Answer:
C. The Protons
Answer:
The Answer is Protons C.
Explanation:
Its quite simple, u see, according to my calculations its c.
How many neutrons does calcium have?
.20. 60. 79. 40
Answer:
20
Explanation:
Atomic number/proton number = 20 (protons in nucleus)
Atomic mass number = 40 (protons + neutrons in nucleus)
40 - 20 = 20
Use the information in the table to calculate ASrxn
for each of these reactions. Round all answers to
nearest whole number.
Answer:
-198
-5
-148
Explanation:
The entropy of a system is usually denoted by the symbol 'S'. The change in entropy is given as ΔS. It is generally expressed in JK⁻¹mol⁻¹.
What is entropy?The entropy is defined as the property of a system which measures the disorder or randomness of the system. Like internal energy and enthalpy entropy is a state function and it is also an extensive property.
The change in entropy is given as:
ΔS reaction = S-Products - S -Reactants
1. ΔS = (2 × 192.5 - (3 × 130.58 + 191.50) = -198.24 J/K
2. ΔS = (213.6 + 2 × 188.83) - 186.3 + 2 × 205.0 = -5.04 J/K
3. ΔS = (2 × 220.0) - (2 × 191.50 + 205.0) = -148 J/K
For spontaneous process in isolated systems, the entropy change is positive. The greater the disorder in a system, the higher is the entropy. The solid state has lower entropy.
To know more about entropy, visit;
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366 Cal to kilowatt-hours, how to convert?
Answer:
0.000425 kilowatt hour
PLEASE HELP
I WILL GIVE BRAINLIEST
4 Which pair of ions is isoelectronic?
A Ca2+ and 02-
B Na+ and 02-
OC Lit and Cl-
OD Mg2+ and CI-
Answer:
B. Na+ and O2-
Explanation:
Na+ plus has 10 electrons and O2- also has 10 electrons
Why is balance important in organisms?
Solve and show work. Li2S + 2 HNO3 --> 2 LiNO3 + H2S (a) Calculate the mass of lithium sulfide that will react with 250 mL of 0.65 M nitric acid (b) How many mL of 9.6 M HNO3 are needed to make 250 mL of 0.65 M HNO3 solution? (c) How many grams of nitric acid are needed to make 750 mL of 9.6 M HNO3.
Li2S + 2 HNO3 --> 2 LiNO3 + H2S
Li2 S + H2 N2 O2 --> Li2 N2 O5 + H2 S
Li S + H2 N2 O5 -> Li N2 O5 + H2 S
Li2 S2 + H4 N4 O10 --> Li2 N4 O10 + H4 S2
Li^2 S^2 + H^4 N^4 O^10 --> Li^2 N^4 O^10 + H^4 S^2
What is the percent by mass (mv) of a solution with 1.56 g of benzene dissolved in gasoline to make 998.44 mL of solution? (density of gasoline = 0.7489 g/mL)
please I need help lol
Answer:
The percentage by mass of benzene in the solution is approximately 0.2%
Explanation:
The given parameters are;
The mass of the benzene solute dissolved in the gasoline solvent, m₁ = 1.56 g
The total volume of the benzene gasoline solution made, V = 998.44 mL
The density of gasoline, ρ = 0.7489 g/mL
Mass, m = Density, ρ × Volume, V
∴ The mass of gasoline in the 998.44 mL, solution = 0.7489 g/mL × 998.44 mL = 747.731716 g
The total mass of the solution = The mass of the benzene in the solution + The mass of the gasoline in the solution
∴ The total mass of the solution = 747.731716 g + 1.5 g = 749.231716 g
[tex]The \ percentage \ by \ mass = \dfrac{The \ mass \ of \ a \ fraction}{(The \ mass \ of \ the \ total \ solution)} \times 100[/tex]
The percentage by mass of benzene in the solution = (1.5 g/749.231716 g)×100 ≈ 0.2% by mass.
6) What causes the stars to give off light when ignited?
Answer:
When fireworks explode in the sky, the gunpowder reactions create a lot of heat, causing the metallic substances pres- ent in the stars to absorb energy from the heat and emit light. ... These electrons absorb energy from the heat, which causes them to move from their original ground-energy state to an excited state.
Explanation:
:))
The process which generates energy in sun and other stars is nuclear fusion. The emission of light energy is thus the result of fusion reaction taking place in stars.
What is nuclear fusion?Nuclear fusion is a chemical process in which two light nuclei or isotopes of an atom fuse together to form a heavy nuclei with the release of million tons of energy.
The process in which a heavy atom breaks into lighter atoms is called nuclear fusion and it is also releasing massive energy but less than the from fusion because, the breaking of chemical bonds needs some energy to absorb.
Fusing two chemical bonds is needs no more energy and it is an energy releasing process. Millions of hydrogen atoms and its isotopes fuse together in several steps and form helium atoms.
This process of release million tons of heat energy and light energy. This will make the stars glow.
To find more about nuclear fusion, refer the link below:
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How many molecules are in 5.60 L of oxygen gas
Answer:
5.6L of O2 means we have 0.25 moles of O2. and as 1 molecule of O2 has 2 atoms, so, 1.50575*10^23 molecules will have 2*1.50575*10^23 atoms=3.0115*10^23 atoms of O.
2) Which of the following statements are true about energy and matter?
The transfer of energy through empty space can be by radiation.
Conduction is heat transfer by direct contact of particles of matter.
Conduction is the transfer of heat by the movement of a heated fluid.
Density is a measure of how much mass there is in a volume of a substance.
The movement of energy from a warmer object to a cooler object is called heat
transfer.
Answer:
the transfer through empty space can be radiation
Explanation:
because when it transfers it turns into radiation
science, not math
clearly define the dependent and independent variables
Calculate the reaction rate given the following:
After 2 minutes (120 seconds), the concentration of a product was measured to
increase from 0.0012 M to 1.48 M.
1.48 M/s
0.0123 M/s
0.0012 M/s
-0.0123 M/s
Answer:
0.0123 M/s
Explanation:
The reaction rate is the rate at which the reaction takes place and results in an increased concentration of the products. The rate of the reaction is 0.0123 M/s.
What is the reaction rate?
The reaction rate is the increase of the concentration of the product with respect to time in seconds. The rate of reaction is given by,
[tex]\rm rate = \rm \dfrac {\Delta C}{\Delta t}[/tex]
Given,
Change in product concentration = 1.478
Time period = 120 seconds
Substituting values in the above equation:
[tex]\begin{aligned} \rm rate &= \rm \dfrac {\Delta C}{\Delta t}\\\\& = \dfrac{1.478}{120}\\\\&= 0.0123 \end{aligned}[/tex]
Therefore, option B. 0.0123 M/s is the reaction rate.
Learn more about reaction rate here:
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Which of the following is the correct chemical equation and is properly balanced for:
Iron III oxide reacts with potassium iodide to produce iron III iodide and potassium oxide
Answer:are there any abc or do you have to make an answer?
Explanation:
Which is the mass of 0.13 moles of potassium chloride, KCl
Answer:
9.69 grams
Explanation:
e
Answer:
9.69g KCl
Explanation:
[tex]0.13 molesKCl\frac{74.55gKCl}{1moleKCl} =9.69gKCl[/tex]
__BaF2+__Na2S-->__BaS2+__NaF
Answer:
The reaction can't be balanced
Explanation:
To solve the chemical reaction:
_BaF₂ + _Na₂S → _BaS₂ + _NaF
We will use the algebraic method:
XBaF₂ + YNa₂S → ZBaS₂ + WNaF
Ba = X = Z
F = X/2 = W
Na = Y/2 = W
S = Y = Z/2
From the equations of F and Na:
X= Y
But from Ba and S equations:
X = 2Y
As both equations are inconsistent:
The reaction can't be balancedwhat is valency pls i need it now