Answer:
B
Explanation:
A characteristic of members of the domain Bacteria is that they: C. lack a nucleus in their cells.
What is a cell?A cell can be defined as the fundamental, functional, structural and smallest unit of life, which is primarily found in all living organisms.
The classification of living organisms.Basically, all living organisms are broadly classified into two (2) main categories according to their cell type and these are;
Unicellular organisms: these are living organisms with a single cell.Multicellular organisms: these are living organisms that possess multiple cells.The domain Bacteria are generally prokaryotes, which means that they are prokaryotic cells with bacterial rRNA but no nuclear membrane.
In conclusion, all members of the domain Bacteria lack a nucleus in their cells.
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Transition metals have delocalized electrons called an "electron sea." What property does this allow?
A. Conducting electricty
B. Brittleness
C. Forming multiple bonds
D. Flammability
Answer:
A conducting electricity
Explanation:
The "electron sea" allows the current to flow across the electrons. If the electrons were stuck in their positions, these metals would be better insulators than conductors because they couldn't spread (or conduct) the energy as electricity.
B, C, and D are all not things directly caused by the delocalized electrons.
Transition metals have delocalized electrons called an "electron sea." they are responsible for conducting electricity. option A is correct.
What are transition metals?As the name in transition only so these are the d group elements of the periodic table comes in between of s and p block and the properties of transition metals lies between this.
According to this they contain the properties of both the metals and non-metals as their property consist or transit between the metals and non metals known as d block elements they also behave like a bridge in between them.
As they allow the transfer of electrons and due to which they form an electron sea and these electrons are responsible for conduction of electricity.
Therefore, transition metals have delocalized electrons called an "electron sea." they are responsible for conducting electricity. option A is correct.
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Which is most likely an effect of long-term environmental changes
Answer:
adaptation
extinction
speciation
Explanation:
Answer:
D
Explanation:
Which of the following Substances would have the highest vapor pressure at 298 K?
A) propanol (b.p.= 97 °C)
B) acetone (b.p.=56°C)
C) benzene (b.p. = 80°C)
D) chloroform (b.p. = 61°C)
Answer:B
Explanation:Because acetone has the lowest boiling point of the options given,it also has the weakest intermolecular forces and will therefore have the highest vapor pressure
"acetone (b.p.=56°C)" would be the highest vapor pressure.
The maximum vapor pressure would be found at the lowest temperature. Acetone seems to have the smallest intermolecular hydrogen bonding and therefore the greatest evaporation rate.Acetone seems to have the different boiling points of something like the choices shown. As a result, acetone seems to be the right answer, while the other answers are erroneous even though they have greater boiling pressures than acetone.Thus the above option i.e., "alternative B" is correct.
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what is it called when
Light changes direction and slows down when it enters water from air.
Answer:
When light travels from air into water, it slows down, causing it to change direction slightly. This change of direction is called refraction. When light enters a more dense substance (higher refractive index), it 'bends' more towards the normal line.
Explanation:
How would you describe a particle of alpha radiation?
-a helium atom with no neutrons
-an electron ejected from a neutron
-a highly energized light particle, or photon
-a helium nucleus with no electrons
Answer:
A helium atom with no neutrons
The diagram below shows the wavelengths and frequencies for the various regions of the electromagnetic spectrum. Based on the visible light spectrum, which of the following has the longest wavelength? A. a ray of green light B. a ray of violet light C. a ray of blue light D. a ray of orange light
D.
a ray of violet light
Explanation:
Which kind of investigations are meant to provide lager amounts of information about a wide range of variables
A. Hypothesis
B. Experimental
C. Descriptive
D. Comparative
Answer:
comparative
Explanation:
Comparative research, simply put, is the act of comparing two or more things with a view to discovering something about one or all of the things being compared. This technique often utilizes multiple disciplines in one study.
How many moles of SnF₂ will be produced along with 48 grams of H₂? *
10 points
Captionless Image
12 moles
24 moles
48 moles
96 moles
Answer:
The correct option is;
24 moles
Explanation:
Here, we have the reaction as follows;
Sn(s) + 2HF(g) → SnF₂ (s) + H₂ (g)
Therefore, one mole of Sn reacts with 2 moles HF to form one mole of SnF₂ and one mole of H₂
Molar mass of H₂ = 2.01588 g/mol
Therefore, the number of moles of H₂ in 48 grams of H₂ is given by the relation;
[tex]Number \ of \ moles \ of \, H_2 = \frac{Mass \ of H_2}{Molar \ Mass \ of H_2}=\frac{48}{2.01588} = 23.8109 \ moles \approx 24 \ moles[/tex]
Since one mole each of SnF₂ and H₂ are produced, the number of moles of SnF₂ produced = 24 moles.
The number of moles of SnF₂ that will be produced is 24 moles.
PLEASE HELP ANYONE IM TOO DUMB TO ANSWER THESE :(
Answer:
The "2" applies only to the sodium, and sugar is a substance
Explanation:
The amount of atoms in an element are written using small letters after the element they refer to.
dark matter causes objects to what
Answer:
Dark matter does not really affect objects to do anything really, but it is know to be very dense in gravitational pull and does not emit any radiation.
Explanation:
A titration graph shows little resistance to a change in pH at the start and has a single equivalence point of 8.6.
This graph most likely presents data from what type of titration?
a polyprotic acid titrated by a strong base
a strong base titrated by a strong acid
a weak base titrated by a strong acid
a weak acid titrated by a strong base
Answer: A weak acid titrated by a strong base
Explanation:
The graph refers to the titration of a weak acid such as Hydrofluoric acid with a strong base such as Sodium Hydoxide. What happens is that as the process begins, the pH rises quickly as there is little resistance to the base.
After some time the solution formed begins to act as a buffer between the remaining acid and the base. This reduces the pH change rate and will continue until the base overcomes the solution's buffering capacity.
The Equivalence point which is where the acid will be at it's base form, will be at a pH of 8.6.
I have attached a graph showing the process for better understanding.
Danielle has blonde hair. Her mother has blonde hair and her father has brown.
Which explains how danielle inherited her hair color
Answer: She inherited a chromosome that carries an allele for hair color from each parent.
Explanation: took test - this answer is correct on Edg
Answer:
D is the answer :)
6) Calculate the [H^+] of a solution that has a pH of 8.76 *
Answer:
7.737e-9
Explanation:
[H+]=10^-pH
10^-8.76
7.737800829e-9
what do a group of cells make up
Which of the following choices will an atom of sulfur (S) be most likely to bond with?
A. 1 oxygen (O) atom
B. 1 helium (He) atom
C. 2 hydrogen (H) atoms
D. 3 nitrogen (N) atoms
Answer:
2 hydrogen (H) atoms
Explanation:
Answer via Founder's Education/ Educere
An atom of sulfur (S) is most likely to bond with 2 hydrogens (H) atoms. Hence, option C is correct.
What is an atom?An atom consists of a central nucleus that is usually surrounded by one or more electrons.
The bond between a hydrogen atom and a sulfur atom is nonpolar covalent, so the electrons are shared because its outer shell is not full, a single atom of sulfur can make a molecular bond with each of the two hydrogen atoms, resulting in a single molecule of hydrogen sulfide.
Hence, an atom of sulfur (S) is most likely to bond with 2 hydrogens (H) atoms.
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If a student wanted to find a diagram of the human reproductive system in his/her science textbook, which part of the book should be looked at FIRST?
A) appendix
B) bibliography
C) glossary
D) index
Answer:D)index
Explanation:
Calculate the percent yield for the reaction above if 25.0 grams of
H2SO4 was actually produced and the theoretical yield was predicted to be 42.0 grams. (% yield = Actual/ theoretical x 100)
SO3(g) + H200 H2SO4(9)
O 59.5
O 168
O 0.595
O 1.68
Answer:
A. 59.5
Explanation: actual divided by theoretical times 100 equals percent yield so 25/42 times 100 is 59.5 ish
Hunter’s velocity was 4.5 m/s. At the end of his race, his velocity was the same. Which best describes his movement?
Answer:
His movement stopped
Explanation:
Which of the following choices will an atom of nitrogen (N) be most likely to bond with?
A. 2 calcium (Ca) atoms
B. 1 hydrogen (H) atom
C. 3 lithium (Li) atoms
D. 2 carbon (C) atoms
Answer:
3 lithium atoms
Explanation:
just took the quiz
3 lithium (Li) atoms of nitrogen (N) will be most likely to bond with ,therefore option (c) is correct.
What are the characteristics of lithium atom ?Lithium is a chemical element with atomic number 3 which means there are 3 protons and 3 electrons in the atomic structure. The chemical symbol for Lithium is Li.
Properties of lithium element-
Lithium is located at position 3 on the periodic table. Lithium is a light and highly reactive metal. Lithium can be used as a refrigerant due to its high specific heat.The electronic configuration for lithium is [He] 2s1.3 lithium (Li) atoms of nitrogen (N) will be most likely to bond with, hence option (c) is correct.
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____ rain falls in areas that have air pollution.
Answer:
acid rain falls in areas that have air pollution
Answer:
Acid rain
Explanation:
Acid rain is caused by a chemical reaction that starts with the release of compounds such as sulfur dioxide and nitrogen oxides into air.
Determine whether the statement is true or false, and why? “Climate change could cause many habitats to be destroyed, leading to the extinction of many plant species.”
A. False, it should read, “Climate change cannot cause habitats to be destroyed, and animal & plant species are not in danger.”
B. True
C. False, it should read, “Climate change could cause many habitats to be destroyed, leading to the extinction of many animal species.”
D. False, it should read, “Climate change could cause many habitats to be destroyed, leading to the extinction of many plant and animal species.”
Answer:
D
Explanation:
False, it should read, “Climate change could cause many habitats to be destroyed, leading to the extinction of many plant and animal species.”
The Climate change could cause many habitats to be destroyed, leading to the extinction of many plant species is False, it should read, “Climate change could cause many habitats to be destroyed, leading to the extinction of many plant and animal species.” option D is correct.
What is the extinction of animals?The animals that ever existed on earth became extinct due evolution which is happening on the basis of climatic changes in earth and due to human habits too.
Extinctions happen when a species dies out from a metabolic events, evolutionary change, or human interference or habits.
The truth there is not even a exact number or data from which it can be known how many species of plants, animals, fungi, and bacteria exist on Earth.
Natural disasters, Changes in weather , death causing Disease , Pollution, Climate change are some other causes for this mostly for extinction of plants.
Therefore , option C is correct.
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Please show all of your work! :)
Answer:
A
Explanation:
To answer this, we need to use Gay-Lussac's law, which states that:
[tex]\frac{P_1}{T_1}= \frac{P_2}{T_2}[/tex] , where P is pressure and T is temperature
The initial pressure we're given is 4.5 atm (so P1 = 4.5) and the temperature is 45.0°C; however, we need to change Celsius to Kelvins, so add 273 to 45.0: 45.0 + 273 = 318 K (so T1 = 318).
The final pressure is what we want to find, but we do know the final temperature is 3.1°C. Converting this to Kelvins, we get: 3.1 + 273 = 276.1 K, which means T2 = 276.1.
Plug these values in:
[tex]\frac{P_1}{T_1}= \frac{P_2}{T_2}[/tex]
[tex]\frac{4.5}{318}= \frac{P_2}{276.1}[/tex]
Multiply both sides by 276.1:
[tex]P_2[/tex] ≈ 3.9 atm
The answer is thus A.
Answer:
A) 3.9 atm
Explanation:
Gay Lussac's Law Formula :
⇒ P₁/T₁ = P₂/T₂
Given :
P₁ = 4.5 atmT₁ = 45.0 °C = 318 KT₂ = 3.1 °C = 276.1 KSubstituting the values :
4.5/318 = P₂/276.1P₂ = 276.1/318 x 4.5P₂ = 0.87 x 4.5P₂ = 3.915 atm ≈ 3.9 atmThe correct option is : A) 3.9 atm
what total mass of a 16 gram sample of 60Co will remain unchanged after 15.9 years
Answer:
2 g
Explanation:
A person suffered indigestion after eating a freshly jarred pickle. If the amount of white vinegar consumed in the pickle was 25.0 mL (5% or 0.80 M of aqueous acetic acid), how many tums would they need to consume to neutralize the acid?
Final answer:
To neutralize the acid in the jarred pickle, you would need an antacid such as Tums which contains calcium carbonate. The balanced equation for the neutralization reaction between acetic acid and calcium carbonate is 2CH3COOH + CaCO3 -> Ca(CH3COO)2 + H2O + CO2.
Explanation:
Vinegar is a solution of acetic acid in water. To neutralize the acid, you would need an antacid such as Tums which contains calcium carbonate (CaCO3). The balanced equation for the neutralization reaction between acetic acid and calcium carbonate is:
2CH3COOH + CaCO3 → Ca(CH3COO)2 + H2O + CO2
Based on the equation, you can determine the number of moles of acetic acid present in the pickle (given the volume and molarity), and then calculate the number of moles of Tums (calcium carbonate) needed to neutralize that amount of acetic acid.
The concentration of an acid or base is defined as the ratio of the amount of
O A. solvent to the amount of solute in a solution
O B. conjugate acid to conjugate base
O C. conjugate base to conjugate acid
OD. solute to the amount of solvent in a solution
The concentration of an acid or base is the ratio of the amount of solute to the amount of solvent in a solution, which is option D.
Explanation:The concentration of an acid or base is defined as the ratio of the amount of solute to the amount of solvent in a solution. This means that the correct answer is D. solute to the amount of solvent in a solution. When looking at a solution of an acid or base, you may also consider the number of H+ or OH- ions present in the formula to understand the actual concentration of H3O+ or OH- ions, which can differ from the overall concentration of the acid or base.
"The correct answer is D. solute to the amount of solvent in a solution.
The concentration of an acid or base, or any solution, is typically expressed as the amount of solute present in a given amount of solvent. The solute is the substance that is dissolved in the solvent, which is the substance that does the dissolving. In the context of acids and bases, the concentration is often given in terms of molarity (moles of solute per liter of solution), molality (moles of solute per kilogram of solvent), or other concentration units.
In this expression, the amount of solute (n) is divided by the volume of the solution (V), which includes both the solute and the solvent. This ratio gives us the concentration of the solute in the solvent.
The other options provided are incorrect for the following reasons:
Option A (ratio of the amount of solvent to the amount of solute) is the inverse of the correct definition of concentration.
Option B (ratio of the conjugate acid to the conjugate base) refers to the acid dissociation constant (Ka) for acids or the base dissociation constant (Kb) for bases, which are measures of the strength of an acid or base, not its concentration.
Option C (ratio of the conjugate base to the conjugate acid) is also related to the strength of an acid or base in terms of its equilibrium constant, not its concentration.
Therefore, the correct definition of the concentration of an acid or base solution is the ratio of the amount of solute to the amount of solvent, which corresponds to option D."
Which is the correct order of the celestial
bodies during a solar eclipse?
A. Sun, Moon, Earth
B. Sun, Earth, Moon
C. Moon, Earth, Sun
D. Moon, Sun, Earth
Answer:
Which is the correct order of the celestial
bodies during a solar eclipse?
A. Sun, Moon, Earth the right answer good luck
The radioisotope xenon-133 has a half-life of 5.2 days. How much of an 80 gram sample would be left after 20.8 days? PLEASE SHOW YOUR WORK
Final answer:
Approximately 5 grams of an 80 gram sample of xenon-133 would be left after 20.8 days.
Explanation:
To determine how much of the xenon-133 sample would be left after 20.8 days, we need to calculate the number of half-lives that have occurred. The formula to calculate the remaining amount is:
Remaining amount = Initial amount imes (1/2)ⁿ
In this case, the initial amount is 80 grams and the half-life of xenon-133 is 5.2 days. Therefore, the number of half-lives is given by:
Number of half-lives = (20.8 days) / (5.2 days per half-life) = 4
Plugging the values into the formula, we have:
Remaining amount = 80 g imes (1/2)⁴ = 80 g imes (1/16) = 5 g
Therefore, approximately 5 grams of the 80 gram sample would be left after 20.8 days.
When air near Earth's surface is heated, it rises, taking heat with it. The type of energy transfer involved here is called *
Convection, conduction or radiation
Please choose an accurate answer and explain
Answer: The heat moves through the atmosphere through the process of radiation.
Explanation:
There are three modes of transfer:
1. Conduction: This type of heat transfer happens when there is direct contact between the two object.
2. Radiation: This type of heat transfer happens when there is direct transfer of energy through space.
3. Convection: This type of heat transfer happens when there is a movement of fluid (liquid or gas) in which convection currents are produced due to the movement of hot fluid upwards and cold fluid downwards.
Thus heat moves through the atmosphere through the process of radiation
If 153.48 mL of hydrogen is collected at 14.0 degrees C and 973 kPa, what will be its volume at STP?
Answer:
1.53 L.
Explanation:
Given,
Volume pf hydrogen, V₁ = 153.48 mL = 0.15348 L
Temperature, T₁ = 14°C = 273+14 = 287 K
Pressure,P₁ = 973 kPa
1 atm = 101.325 kPa
973 kPa = 9.60 atm
At STP
P₂ = 1 atm
T₂ = 25° C = 273+25 = 298 K
V₂ = ?
Now,
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
[tex]\dfrac{9.60\times 0.15348}{287}=\dfrac{1\times V_2}{298}[/tex]
[tex]V_2 = 1.53\ L[/tex]
Hence, the volume at STP is 1.53 L.
A scientist observed a fungus and recorded what she saw:
• orange in color
• found on the surface of a leaf
• tightly arranged hyphae
• contains cell wallsesult of this?
Answer:
C)
Explanation:
tightly arranged hyphae
PLEASE MARK ME BRAINLIEST IF YOU ARE HAPPY WITH THE ANSWER
Answer:
Tightly arranged hyphae