A population is all the organisms of a single species in a given area
Answer:
Explanation:
A population is a group of organisms of the same type. A population is a group of members that belong to the same species.
Therefore, an organism is a part of a population.
25) If an object’s density is greater than 1.00 g/mL, it will ______________ in water.
A) Sink
B) Float
__________________________________________
If an object’s density is less than 1.00 g/mL, it will ______________ in water.
A) Sink
B) Float
_______________________________________________________
26) What is the density of a rock if it has a mass of 50 g and a volume of 10 mL? (You must show your work!)
Answer:
1- Option A = Sink
2- Option B = Float
Explanation:
1- If an object’s density is greater than 1.00 g/mL, it will sink in water.
For example, the density of aluminum is 2.7g/cm³. That is why it will sink in water.
2- If an object’s density is less than 1.00 g/mL, it will float in water.
For example, the density of oak is 0.7 g/cm³. That is why oak will float in water.
3- Given data:
Mass, m = 50 g
Volume, v = 10 cm3 ( 1ml = 1cm3)
Formula of density :
Density = mass/ volume
d = m/v
d = 50g/10cm3
d = 5 g/cm3
A gas occupies 318 liters at 10.0 atm. What is the pressure if the volume becomes 662.5 L?
Answer:
4.8 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm.
V is the volume of the gas in L.
n is the no. of moles of the gas in mol.
R is the general gas constant,
T is the temperature of the gas in K.
If n and T are constant, and have two different values of V and P:
P₁V₁ = P₂V₂
P₁ = 10.0 atm, V₁ = 318.0 L.
P₂ = ??? atm, V₂ = 662.5 L.
∴ P₂ = P₁V₁/V₂ = (10.0 atm)(318.0 L)/(662.5 L) = 4.8 atm.
34. Given the fact that the concentrations of reactants and
products are not changing, why is the word dynamic
used to describe chemical equilibrium?
Answer:
The word dynamic is used to describe chemical equilibrium because even though the concentration of reactants and products remains constant, the reaction does not stop, but still continues with the rate of forward reaction equal to the rate of backward reaction. This is opposed to static equilibrium where there is no reaction at all.
Hope this helps you out!
The word dynamic is used to describe chemical equilibrium because, despite concentrations of reactants and products being constant, reactions continue in both directions at the same rate, indicating continuous exchange.
Given the fact that the concentrations of reactants and products are not changing, the word dynamic is used to describe chemical equilibrium because, at this state, the forward and reverse reactions are happening at the same rate. Even though there is no net change in the concentrations of reactants and products, reactions continue to occur in both directions. This means that molecules of reactants are constantly being converted into products at the same rate as products are being converted back into reactants, maintaining a constant concentration of both. Therefore, the equilibrium is dynamic because the reactants and products are in a state of continuous, but balanced, exchange.
How are acids and bases similar and different
Answer & Explanation:
Similarities:
Both acids and bases are electrolytes which means that they're good conductors of electricity. Acids and bases both produce ions in water solution.Difference:
Acids release hydrogen ions (H⁺) whereas, bases release hydroxide ions (OH⁻).Someone help pls.
A s a p
A s a p
A s a p
It’s C. One or more substances with different chemical properties will form.
At 0 degrees Celsius, a gas occupies 22.4L. How hot must the gas be in celcius to reach a volume of 25.0L
Answer:
31.7 °C
Explanation:
Charles law states that for volume of a gas is directly proportional to the absolute temperature for a fixed amount of gas at constant pressure
we can use the following equation
V1/T1 = V2/T2
where V1 is volume and T1 is temperature at first instance
V2 is volume and T2 is temperature at second instance
temperature should be in kelvin scale
T1 - 0 °C + 273 = 273 K
substituting the values in the equation
22.4 L / 273 K = 25.0 L / T2
T2 = 304.7 K
temperature in celcius is - 304.7 K - 273 = 31.7 °C
the gas must be 31.7 °C to reach a volume of 25.0 L
When 2 grams of powdered lead (IV) oxide was added to 100 cm3 of hydrogen peroxide, water and oxygen were produced. Lead (IV) oxide was not used up in the reaction. Based on the information, which of the following is likely to decrease the rate of formation of the products?
Replacing the powdered lead oxide with its large crystals
Removing lead (IV) oxide from the reaction mixture
Using 50 cm3 of hydrogen peroxide
Using 1.0 gram of lead (IV) oxide
Answer:
The right answer is:
Replacing the powdered lead oxide with its large crystals
Removing lead (IV) oxide from the reaction mixture
Using 1.0 gram of lead (IV) oxide
Explanation:
Based on the given information this reaction is the catalytic decomposition of H₂O₂ into water and oxygen using Lead (IV) oxide as a catalyst.
The catalyst surface area is directly proportional to the reaction rate So, Replacing the powdered lead oxide with its large crystals would decrease the reaction rate due to the has larger surface area than its large crystals.2. Also, Removing lead (IV) oxide from the reaction mixture the reaction rate decreased because as the catalyst is removed.
3. Using 50 cm³ of hydrogen peroxide doesn't affect the rate because the concentration of the reactant doesn't change.
4. Using 1.0 gram of lead (IV) oxide would decrease the reaction rate because the amount of catalyst decreased
So, The right answer is:
Replacing the powdered lead oxide with its large crystals
Removing lead (IV) oxide from the reaction mixture
Using 1.0 gram of lead (IV) oxide
calculate the empirical formula 9.1 g of lithium and 10.4 g of oxygen
To find the empirical formula of a compound with 9.1 g of lithium and 10.4 g of oxygen, we calculate the moles of each element and express their ratio in the simplest whole numbers. The empirical formula is determined to be Li₂O.
Explanation:To calculate the empirical formula of a compound formed from lithium and oxygen, we need to determine the moles of each element present in the 9.1 grams of lithium and 10.4 grams of oxygen. The molar mass of lithium (Li) is approximately 6.94 g/mol, and the molar mass of oxygen (O) is about 16.00 g/mol.
First, we calculate the moles of lithium:
Moles of Li = mass (g) ÷ molar mass (g/mol) = 9.1 g ÷ 6.94 g/mol = 1.31 moles of Li
Next, we calculate the moles of oxygen:
Moles of O = mass (g) ÷ molar mass (g/mol) = 10.4 g ÷ 16.00 g/mol = 0.65 moles of O
Now we determine the simplest whole number ratio of the elements in the compound:
Li to O ratio = 1.31 moles of Li ÷ 0.65 moles of O = 2:1
Therefore, the empirical formula is Li₂O
This is the process where wind, water or ice may add a layer of sediment to a landform.
Answer:
Deposition
Explanation:
Answer:
Deposition...
Explanation:
Deposition is a process in which the water, ice and wind for layers of sediments when the fluid flow loses it's kinetic energy. After losing energy, the flow of soil in restricted and a layer over layer of soil is formed by deposition called sediments.
-Material A has a melting point of 34°C whereas Material B has a melting point of 56°C. Both materials have been placed in an oven at 50°C Describe the state of each material after being being in the oven for a period of time.
I'm confused, if material B is on for the same amount of time does that mean that it has liquified and material A has melted slightly?
Answer:
Explanation:
Material A has a melting point of 34°C
Material B has a melting point of 56°C
Both materials, lets say a metal have been subjected to a temperature of 50°C
After a period of time, both of them would have melted to their liquid state.
The atoms of the solids would vibrates and the bonds would begin to break to form melt.
Material A would be the first to melt as it has a lower melting point. The lower the melting point, the faster and quicker it would reach its melting temperature.
Material B would need to accumulate more heat and its temperature would continue to rise for the phase change to occur. As it reaches the 50°C mark, the bonds are set free and a melt forms.
If the amount of CFCs in the atmosphere decreases, then __.
Plato users: ozone holes could begin to shrink in size
Answer:
Ozone holes could begin to shrink in size.
Explanation:
The use of CFCs today is one of the anthropogenic causes of ozone depletion. CFCs are found in Air conditioners, refrigerators and are excellent coolants.
When CFCs are released into the atmosphere, they react spontaneously with ozone.
Ozone is made up of 3 oxygen atoms and it serves as a protective covering for the very harmful ultraviolet rays from reaching the earth. Ozone cuts off these radiation and it reflects them back into space.
Chloroflurocarbons release Chlroine atoms when they get broken down by ultraviolet rays. The Cl released produces a series of reactions in the presence of ozone.
Chlorine is very reactive as it is an halogen. It requires just an electron to complete its octet.
Chlorine freely reacts with the ozone producing a range of compounds. Most of the ozone becomes oxygen molecules.
This would deplete the ozone greatly. The increasing use of CFCs leaves holes in the ozone layer. The holes allow for harmful UV rays to reach the earth surface. This can lead to various harm on human lives on the earth surface.
This is why CFCs are not permitted in appliances again.
What is the overall order of reaction for this rate law: Rate = k ? A. zero B. first C. second D. third
Answer: hey plato buddie, the answer is A! zero
Explanation:
Answer : The overall order of reaction is, (A) zero order reaction.
Explanation :
Rate of reaction : It is defined as the rate of change in concentration of reactant or product with respect to time.
Order of reaction : It is defined as the sum of the exponents or powers to which the molar concentration in the rate law equation are raised to express the observed rate of reaction. It depends on the power of concentration of reactant.
As per question, the given rate expression is,
[tex]Rate=k[/tex]
From this expression we conclude that there is no power of concentration of reactant. That means, it is a zero order reaction.
Hence, the rate order of reaction is, zero order reaction.
Which property describes how much energy must be added to an atom to remove an outermost election
Answer:
By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase. The process by which the first ionization energy of hydrogen is measured would be represented by the following equation.
Explanation:
Niagara Falls is a good example of
A.kinetic energy being converted into potential
B.potential energy being converted into kinetic energy
C.energy being lost
D.energy being created
Which one ?^
B. Potential energy being converted into kinetic energy. Hope this helps!
The second answer choice
What will the final volume of a gas be if it is heated from 9 K to 117 K, and the initial volume is 85.5 L?
Answer:
1111.5L
Explanation:
Snow forms when clouds cool to the dew point. True False
Answer:
False.
Explanation:
Snow forms when tiny ice crystals in clouds stick together to make snowflakes.
Answer:
what he said lol.
Explanation:
Need help !!!!! ASAP
The answer is:
The new temperature will be equal to 4 K.
[tex]T_{2}=4K[/tex]
Why?We are given the volume, the first temperature and the new volume after the gas is compressed. To calculate the new temperature after the gas was compressed, we need to use Charles's Law.
Charles's Law establishes a relationship between the volume and the temperature at a gas while its pressure is constant.
Now, to calculate the new temperature we need to assume that the pressure is kept constant, otherwise, the problem would not have a solution.
From Charle's Law, we have:
[tex]\frac{V_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}[/tex]
So, we are given the following information:
[tex]V_{1}=500mL\\T_{1}=20K\\V_{2}=100mL[/tex]
Then, isolating the new temperature and substituting the given information, we have:
[tex]\frac{V_{1}}{T_{1}}=\frac{V_{2}}{T_{2}}[/tex]
[tex]T_{2}=\frac{T_{1}}{V_{1}}*V_{2} \\[/tex]
[tex]T_{2}=\frac{20.00K}{500mL}*100mL\\[/tex]
[tex]T_{2}=4K[/tex]
Hence, the new temperature will be equal to 4 K.
[tex]T_{2}=4K[/tex]
Have a nice day!
In sexual reproduction, an offspring is produced with genes from both parents. When the offspring has a new genetic variation that it got from neither of its parents, it is called A. an autosome. B. a recessive gene. C. a mutation. D. a phenotype.
Answer:c a mutation
Explanation:
Final answer:
In sexual reproduction, a new genetic variation in offspring that did not come from either parent is called a mutation. Mutations are a key source of genetic diversity and contribute to the evolution of new characteristics within a population. So the correct option is C.
Explanation:
In sexual reproduction, when an offspring exhibits a new genetic variation not found in either parent, this is known as a mutation. Mutations are changes in DNA that serve as the ultimate source of new alleles or new genetic variation within a population. This genetic diversity is essential for the evolution of species, as it allows for adaptations to changing environments and the development of new traits.
Harmless mutations and sexual recombination play a crucial role in the evolution of new characteristics by contributing to genetic diversity. While sexual reproduction can introduce unique combinations of existing genes, it is through mutations that entirely new genetic variations can arise, potentially influencing an organism's phenotype—the observable characteristics of an individual.
Consider the following three-step representation of a reaction mechanism.
Step 1: A + B --> AB (fast) and the rate = k[A][B]
Step 2: AB + B --> AB2 (slow) and the rate = k[AB][B]
Step 3: AB2 + B --> AB3 (fast) and the rate = k[AB2][B]
Overall: A + 3B --> AB3 and the rate = k[A][B]2
Which explains why the rate law for the overall equation is not the same as the rate equation for the rate-determining step?
A; The fastest step determines the overall rate law.
B: The overall rate law is determined from the balanced equation.
C: AB is an intermediate; therefore the rate law is determined from the reactants in the previous step.
D: B is an intermediate; therefore the rate law is determined from the reactants in the previous step.
Answer:
The answer is C. AB is an intermediate; therefore the rate law is determined from the reactants in the previous step.
I just took the test and C. was correct. Please mark me as brainliest!
Answer: C: AB is an intermediate; therefore the rate law is determined from the reactants in the previous step.
Explanation: : Rate law is usually determined from the slowest step of the reaction mechanism.
Thus as we can see that the reaction which is slow has AB as its intermediate, rate law can be determined from the same.
Moreover , we can see that the overall rate law is very different from the rat law determined from the slowest step.
What is the rate law for the reaction?
Answer:
The correct answer option A.
Explanation:
The reaction rate is determined experimentally for different concentrations of the reactants. These data indicate that by changing the concentration of Nh4 + or NO2-, the reaction rate changes. If the concentration of Nh4 + is doubled, keeping constant at NO2- the reaction rate is doubled, and if the concentration of that same reactant is changed by a factor of 4, it is quadrupled, and so on. If the concentration of NO2- is now modified in the same way as the previous one, it is observed that it also changes the reaction rate in this way. And he overall dependence of the reaction on the concentration will be the same for both reactants.
Therefore the reaction rate is proportional to the concentration of Nh4 + and NO2-.
which statement defines activation energy?
Answer:
The statement which defines activation energy is that it is the difference between reactant energy and maximum energy.J
Explanation:
A reaction that does not have activation energy will not take place at all.
Answer:
c
Explanation:
To which mineral group do most of the rocks in Earths crust belong?
Answer: silicate
Explanation:
Answer:
Silicates
Explanation:
About 90 percent of the earth's crust is composed from silicate class of minerals. They are the various compounds of silicon and other chemical elements. Quartz and feldspar are the two most common types of silicate types that are found in Earth’s crust. Mica and olivine, which are the lesser concentrates of silicates are also found abundantly in the earth's crust.
Gases are easily compressible, but other states of matter are not. Which statement best helps to explain the statement above? Their particles are more lightweight than the particles of the other states. Their particles are more spread out than the particles of the other states. Their particles are more flexible than the particles of the other states. Their particles are smaller in size than the particles of the other states.
Answer:their particles are more spread out than others
Explanation:
Answer:
Number 2
Explanation:
Their particles are more spread out than the particles of the other states
what is the percent by mass of a solution that contains 30 grams of potassium nitrite in 0.5 kilograms of water?
Answer:
5.66 %.
Explanation:
mass percent is the ratio of the mass of the solute to the mass of the solution multiplied by 100.
mass % = (mass of solute/mass of solution) x 100.
mass of potassium nitrite = 30.0 g,
mass of the solution = mass of water + mass of potassium nitrite = 500.0 g + 30.0 g = 530.0 g.
∴ mass % = (mass of solute/mass of solution) x 100 = (30.0 g/530.0 g) x 100 = 5.66 %.
What is the mass of 2.30 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?
Answer:
1.52 g NaOH
Explanation:
The molar mass M is a physical property defined as the mass of a given substance (chemical element or chemical compound) divided by the amount of substance.
Molar mass of NaOH is 40.0 g/mol
40.0 g/mol contains 6.022 × 10²³ molecules
∴ 2.30 × 10²² molecules will contain (2.30 × 10²²) * (40.0)/6.022× 10²³
= 1.52 g NaOH
which two traits best help a cactus conserve water in the dry conditions of a west texas desert ecosystem?
The answer is sharp spines and waxy stems. Hope this helped.
The temperatures of the two glasses of water shown in the photograph above are 30°C and 0°C. Which of the following is a correct statement about two glasses of water?
A. The cold water has a higher average kinetic energy
B. The warmer water has lower thermal energy
C. The molecules of the cold water move faster
D. The molecules of the warm water have more kinetic images
What is true about the relative concentrations of hydrogen ions or hydroxide ions in an acidic solution?
a
Hydrogen-concentration is less
b
Hydroxide-ion concentration is greater
c
The concentrations are equal
d
Hydroxide-ion concentration is less
Hydroxide ion concentration is less this statement is true about the relative concentration of hydrogen ions or hydroxide ions in an acidic solution.
Hence, Option (D) is correct answer.
What is pH ?pH is used to measure whether the substance is acidic, basic or neutral and the range is 0 - 14. If the pH is less than 7 then the solution is acidic in nature. If the pH is more than 7 then the solution is basic in nature. If the pH is equal to 7 then the solution is neutral in nature.
What is concentration of hydrogen ion or hydroxide ion in acidic solution ?Acidic solution means the pH of the solution is less than 7. When the solution has pH less than 7 it shows that the hydrogen ion concentration is higher than the hydroxide ion concentration.
Thus, from the above conclusion we can say that Hydroxide ion concentration is less this statement is true about the relative concentration of hydrogen ions or hydroxide ions in an acidic solution.
Hence, Option (D) is correct answer.
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In an acidic solution, the concentration of hydrogen or hydronium ions is greater, and as a result, the concentration of hydroxide ions is less.
Explanation:In an acidic solution, the concentration of hydrogen ions (H+) or hydronium ions (H3O+) is greater than the concentration of hydroxide ions (OH-). This is due to the ionization of the acid in water, which adds more hydrogen ions into the solution, leading to a proportionally lower concentration of hydroxide ions. As per Le Châtelier's principle, the reaction equilibrium of water autoionization shifts to the left, which reduces the concentration of hydroxide ions. Therefore, the correct answer is d: Hydroxide-ion concentration is less.
What products are formed in the electrolysis of 1.0 M
aqueous HBr?
In the electrolysis of 1.0 M aqueous HBr, hydrogen gas is formed at the cathode, while bromine gas and hydroxide ions are formed at the anode.
Explanation:In the electrolysis of 1.0 M aqueous HBr, the following products are formed: hydrogen gas (H2) at the cathode, and bromine gas (Br2) and hydroxide ions (OH-) at the anode.
At the cathode, reduction occurs where two hydrogen ions (H+) gain electrons to form hydrogen gas:
2H+ + 2e- -> H2
At the anode, oxidation occurs where bromide ions (Br-) lose electrons to form bromine gas and hydroxide ions:
2Br- - 2e- -> Br2
2H2O - 4e- -> 4OH- + O2
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which of the following is not a base?
A. bleach
B.toothpaste
C.shampoo
D.orange
Answer:
c. shampoo
Explanation: