Answers
Answer: MCCCMC
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Related Questions
Which gas will have the least collisions between its particles?
A. Helium at 20 C
B. Oxygen at -45 C
C. Carbon dioxide at 80 C
D. Argon at 265 K
Answers
WHY: oxygen we breathe so there’s nothing too bad about oxygen carbon dioxide yes it’s kind of thick air though it won’t work so helium is the only good answer here
The gas that has the least collisions between its particle is helium at 20° C. The correct option is A.
What is collision?Collision is a term used when two particles or object collides or clash and there is an exchange or transformation of energy between them. When a collision happens, the force is exerted on each other.
Helium is the second most abundant element present in the atmosphere. It is the lightest gas and its particle collides when there is an increase in the temperature.
Thus, the correct option is A. Helium at 20° C., regarding the collision of particles between its particles.
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High Melting points
Ionic or covalent
Answers
ionic
hope this help you
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Which of these items is made up of one or more molecules?
Gold
Hydrogen
Salt
Neon
Answers
The item that is significantly made up of one or more molecules is hydrogen. Thus, the correct option for this question is B.
What is a Molecule?A molecule may be defined as a group of one or more atoms that are held together by numerous chemical bonds. It is the smallest particle of a substance that has all sorts of physical and chemical properties of that substance.
Among the given options, gold and neon are the elements, while salt is a compound. Hydrogen is a gas of diatomic molecules bearing the formula H2. It is colorless, tasteless, odorless, non-toxic, and highly combustible. Hydrogen in its molecular form is more common.
A hydrogen molecule is one of the simplest possible molecules which significantly consists of two protons and two electrons. These protons and electrons are remarkably held together by electrostatic forces.
Therefore, the item that is significantly made up of one or more molecules is hydrogen. Thus, the correct option for this question is B.
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Is grilling a ham and cheese sandwich and chemical or physical change?
Answers
Answer:
Physical
Explanation:
I say physical because if you just think about the cheese it wasnt melted before u put that heat on it .
Write a balanced chemical equation, complete ionic equation and a net ionic equation for Copper lll sulfate and zinc.
Answers
Answer: CuSO4 (aq)+ Zn (s) → Cu (s) + ZnSO4(aq)
Explanation: do you mean copper II sulphate CuSO4?
In terms of activation energy, why does increasing the temperature of a
reaction make it proceed more quickly?
A. Increasing the temperature reduces the activation energy.
B. Increasing the temperature increases the potential energy of the
reactants.
O C. Increasing the temperature increases how many reactant
molecules reach activation energy.
D. Increasing the temperature makes the molecules move slower.
Answers
Increasing the temperature increases the potential energy of the reactants, thus making the reaction faster.
What is activation energy?Activation energy is the minimum energy that reactant molecules must possess in order to collide together to form products.
Increasing the temperature of a reaction helped to make the reaction proceed faster. This is because more reactant particles acquire the energy greater than or equal to the activation energy.
Therefore, increasing the temperature of a reaction makes it proceed more quickly.
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A barometer is used to measure air pressure.
Please select the best answer from the choices provided
Т
F
Answers
One of the greatest dangers in a tornado is from flying objects. A 15 pound piece of lumber can turn into a flying missile that could severely damage walls and homes. A piece of steel with a mass of 200 pounds and travelling at the same velocity would cause even more damage. Select any evidence from the list below that you could use to explain why a 200 pound piece of steel would cause more damage than a 15 pound piece of wood travelling at the same velocity.
As the kinetic energy of an object increases, the force it can exert on another object decreases.
As the kinetic energy of an object increases, the force it can exert on another object increases.
Objects with more mass have less kinetic energy.
Objects with more mass have more kinetic energy.
As the velocity of an object increases, its kinetic energy decreases.
As the velocity of an object increases, its kinetic energy increases.
Answers
Answer:
As the kinetic energy of an object increases, the force it can exert on another object decreases.
Explanation:
The diagram below represents H2 and Cl2 molecules that will potentially react to form HCI.
Hydrogen
Chlorine
Which of the following best describes this reaction?
А
The limiting reactant is chlorine.
B
The percent yield will be greater than 100%.
с
Hydrogen and chlorine are nonreactive.
D
All molecules shown will react to form the product.
Answers
The limiting reactant is chlorine in the given reaction of hydrogen and chlorine. Therefore, the correct option is option A.
What is chemical reaction?A chemical reaction is a procedure that causes one group of chemical components to change chemically into another. Chemical atom bonds are formed and broken during chemical reactions, which traditionally only involve changes in the locations of electrons.
The study of chemical processes involving unstable and radioactive materials, where both electronic or nuclear changes may take place, is known as nuclear chemistry. The limiting reactant is chlorine in the given reaction of hydrogen and chlorine.
Therefore, the correct option is option A.
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Select the statements that are true regarding open tubular and packed columns in gas chromatography.
A. For similar analysis times, open tubular columns provide better resolution than packed columns.
B. Packed columns offer increased sensitivity to small sample sizes.
C. Packed columns have a greater sample capacity than open tubular columns.
D. Open tubular columns give better resolution but longer analysis separation times compared to packed columns.
E. Packed columns give broader peaks with longer retention times.
Answers
Answer:
true or false :-
a) yes
b) no
c)yes
d)yes
e)no
For similar analysis times, open tubular columns provide better resolution than packed columns, Packed columns have a greater sample capacity than open tubular columns and Open tubular columns give better resolution but longer analysis separation times compared to packed columns are true regarding open tubular. Hence, options A, C and D are correct.
What is gas chromatography used for?The chemical constituents of a sample mixture are identified, separated, and quantified using an analytical technique called gas chromatography.
Gas chromatography is a technique for separating compounds in mixtures by injecting a gaseous or liquid sample into a mobile phase, which is usually referred to as the carrier gas, and passing the gas through a stationary phase. The mobile phase is often composed of an inert gas or an unreactive gas, such as helium, argon, nitrogen, or hydrogen.
Thus, options A, C and D are correct.
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species evolve at different rates. for example, bacteria are unlikely to become extinct because they adapt more quickly than mammals to environmental changes. which pf the following best explains this difference
A: Bacteria reproduce more rapidly, allowing species to evolve more quickly
B:Bacterial populations are more isolated, permitting increases in genetic variability
C:certain bacteria grow more steadily over time, giving an evolutionary advantage over mammals
D: Individual bacteria have the same genes, providing opportunities for increased biodiversity in one population.
Answers
Answer:A
Explanation:
Species evolve at different rates. for example, bacteria are unlikely to become extinct because they adapt more quickly than mammals to environmental changes. Bacteria reproduce more rapidly, allowing species to evolve more quickly best explains this difference. Therefore, option A is correct.
What allows bacteria to evolve so quickly ?Bacterial species evolve quickly because of their large populations, which provide numerous opportunities for mutations, and because they readily exchange genetic information, even between species. Some of this genetic diversity influences drug sensitivity or resistance, providing material for Darwinian selection.
Bacteria are among the world's fastest reproducing organisms, doubling every 4 to 20 minutes. Some pathogenic strains of E. coli grow quickly.
Bacterial populations evolve antibiotic resistance so quickly due to their fast generation times, large population sizes, and unique gene acquisition methods. These are some of the reasons bacteria have been so successful in evolution.
Thus, option A is correct.
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A student learns that salts like potassium chloride and sodium chloride are introduced in a weekly conducting solution. What option explains the chemical reactions that salts undergo and affect the conductivity of the solution?
a.Salts react chemically with the water particles and decrease the conductivity of the solution
b. Salts help to make the solution non-conducting by reacting with the particles of the solution
c. Salts mix with the particles of the weak conducting solution and helps to produce oxygen from the solution
d. Salts undergoes a chemical reaction with the particles of the solution and increase its conductivity
Answers
Answer:
d. Salts undergoes a chemical reaction with the particles of the solution and increase its conductivity
Explanation:
Salt compounds like potassium chloride (KCl) and sodium chloride (NaCl) mentioned in this question have the ability to disintegrate into their respective ions or charged atoms when dissolved in water. For example;
NaCl (aq) → Na+ + Cl-
However, these ions (Na+ and Cl-) are responsible for the ELECTRICAL CONDUCTIVITY of a solution. Hence, a salt compound when placed in an aqueous solution will form ions, which will conduct electricity. Hence, salinity of a solution increases its conductivity.
According to this question, salts undergoes a chemical reaction to with the particles of the solution to form ions that increase its conductivity.
For the reaction
C2H4(g) + 302(g) → 2002 (g) + 2H20 (8)
if 6.0 mol of CO2 are produced, how many moles of Oz were reacted?
4.0 mol
0 7.5 mol
9.0 mol
o none of these
O 15 mol
Answers
Answer:
9.0 mol
Explanation:
C₂H₄(g) + 3O₂(g) → 2CO₂ (g) + 2H₂O (g)In order to convert from moles of CO₂ to moles of O₂, we need to use the stoichiometric coefficients in the balanced reaction. We use a conversion factor that has moles of CO₂ in the denominator and moles of O₂ in the numerator:
6.0 mol CO₂ * [tex]\frac{3molO_2}{2molCO_2}[/tex] = 9.0 mol O₂Which is an advantage of selling plant fertilizer as a powder rather than as a liquid?
Choose one.
A. The powder must be stored in a childproof container.
B.Transportation costs are reduced.
C.The powder may be a health hazard if proper procedures are not followed during mixing.
D.The gardener has to be able to read directions carefully and mix the proper amount of solvent and solute.
Answers
Answer:A
Explanation: because i saw the sheet
Why do materials interact to light differently?
Answers
Answer:
Refracted (refraction) – the bending of transmitted light as it travels across the boundary of one material into another material in which it's speed is different. Unlike diffraction, this change in direction of light occurs because light is changing its speed in the different substances in it traveling in.
Explanation:
Hope it helps
What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?
Answers
The physical property that is characteristic of all of the elements in the group located in the rightmost column of the periodic table is the gaseous state at room temperature.
What are Physical properties?Physical properties may be defined as those properties of matter that do not involves any chemical manifestation or appearance within the element. These properties are measurable and state the alteration between momentary states. Some examples of physical properties are as follows:
Physical appearance or color.Hardness of elementDensity.Melting and boiling points.Electrical conductivity.The groups located in the rightmost column of the periodic table are known as the halogens and the noble gases. These elements are typically gaseous in phase at room temperature. Apart from this, halogens also have high electronegativities because these elements have seven electrons in their valence electrons.
Therefore, the gaseous state at room temperature is the physical property that is characteristic of all of the elements in the group located in the rightmost column of the periodic table.
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What is the molar mass of (NH4)2 CO3
Answers
2. Which of the following are reactants of photosynthesis? *
a. carbon dioxide, water and light energy
b. glucose and oxygen
c. carbon dioxide, water and ATP
d. carbon dioxide, glucose and light energy
Answers
Answer:
A is the answer.
Most ecosystems originally get their energy from
Answers
One essential step in the manufacture of many plant fertilizers is the production of nitrogen monoxide gas, NO(g). This step is represented by the following balanced equation: 4 NH3(g) + 5 O2(g) --> 4 NO(g) + 6 H2O(l)
Determine the amount of oxygen needed to produce 1.2 x 104 mol of nitrogen monoxide gas.
Answers
Answer: 1.5 moles, or 48 grams
Explanation:
Set up the following:
[tex]\frac{1.2 x 10^4 mol NO}{1}[/tex] × [tex]\frac{5 mol O2}{4 mol NO}[/tex] = 1.5 moles of O2 needed
If you're also looking for the number of grams needed:
[tex]\frac{1.5 mol}{1}[/tex] × [tex]\frac{32 g}{1 mol}[/tex] = 48 grams needed
A hot piece of copper was dropped into 155 g of water at 23.6 °C and 2,100 J of energy was transferred to the water. What is the final temperature of the water?
Answers
Answer:
26.8 °C
Explanation:
Step 1: Given and required data
Mass of water (m): 155 gEnergy transferred to the water (Q): 2100 JInitial temperature of the water (T₂): 23.6 °CFinal temperature of the water (T₁): ? Specific heat of water (c): 4.184 J/g.°CStep 2: Calculate the final temperature of the water
We will use the following expression.
Q = c × m × (T₂ - T₁)
T₂ = 2100 J/(4.184 J/g.°C) × 155 g + 23.6 °C = 26.8 °C
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if the pressure of 200 cm cube of a gas is half at constant temperature.what will be the new volume
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Answer:
hbjeofjwwkjjhhwhhyuhcuh
Explanation:
bjsdhoooiiifckuvghvvr
Organelles carry out specif functions within the cell. True False
Answers
Answer:
true
Explanation:
i need help can someone help. pls
Answers
D: ____________________________________________
E: ____________________________________________
Answers
Answer:
I think the awnser would be c urf mom
Explanation:
Pleaseeeee guysssss
Explain Which enthalpy diagram shows that the reaction above is an exothermic reaction that produces -550 kJ of heat? Why? The
Answers
Answer:
no answer of this question
Salt is an ionic compound that is produced when a cation and an anion from an acid-base reaction combine, and solutions of salts can be neutral, acidic, or basic, depending on the acid-base properties of the constituent cations and anions.
a. True
b. False
Answers
Answer:
a. True
Explanation:
The statement given regarding salt is correct,
Salt is ionic in nature, as it is composed of a positive ion, i.e. , cation and a negative ion, i.e. , anion.
Salt can be made by the combination of respective acid and base.
There are three nature of salt, acid, base and neutral.
Hence, from the given statement of the question,
The correct option is a. True.
HELP PLEASE!! (100 points)
Describe what happens to particles of matter as you cool the matter to absolute zero
(OK). In your description, be sure to explain the changes in kinetic energy and
particle motion
Answers
Answer:
As you cool a matter to absolute zero, their kinetic energy reduces significantly and the molecules slows down and begins to aggregate together. ... As heat is added, the molecules gain more kinetic energy. This shown in their increase motion. When heat is withdrawn, the particles slows down hope this helped
What is the first step in this
experiment?
Answers
Answer: Cut the card borad
Explanation:
HELP NEED THIS BADLLLLY !!!!!!!!!
Answers
Answer:
2 is correct
Explanation:
My friend for you this answer