Answer:
A) Index Fossils
Explanation:
Index fossils are fossils used to define and identify geologic periods. Index fossils must have a short vertical range, wide geographic distribution and rapid evolutionary trends.
The shapes are placed in a basket
What is the probability of choosing a triangle?
A 12/12
B 2/12
C 3/12
D 4/12
Answer: Option B
Explanation: There are 12 total shapes and 2 triangles, therefore the probability would be 2/12
Answer:
B
Explanation:
Determine the volume, in liters, occupied by 0.015 molecules of oxygen at STp?
5.58 X [tex]10^{-25}[/tex] Litres is the volume, in liters, occupied by 0.015 molecules of oxygen at STP.
Explanation:
Data given:
molecules of oxygen = 0.015
number of moles of oxygen =?
temperature at STP = 273 K
Pressure at STP = 1 atm
volume = ?
R (gas constant) = 0.08201 L atm/mole K
to convert molecules to moles,
number of moles = [tex]\frac{molecules}{Avagadro's number}[/tex]
number of moles = 2.49 x [tex]10^{-26}[/tex]
Applying the ideal gas law since the oxygen is at STP,
PV = nRT
rearranging the equation:
V = [tex]\frac{nRT}{P}[/tex]
putting the values in the rearranged equation:
V = [tex]\frac{2.49 X10^{-26} X 0.08201 X 273}{1}[/tex]
V = 5.58 X [tex]10^{-25}[/tex] Litres.
What forces create the bent triatomic shape of a water molecule
Answer:
Repulsion Forces create the bent triatomic shape of a water molecule.
Calculate the pH of a solution of 0.0025M H2SO4
Please help I dont get how to do these
Answer:
2.60
Explanation:
pH= - log [H₂SO₄]
H₂SO₄ is a strong acid only for the first H+ ion, so the concentration of H+ will equal the concentration of the whole molecule.
pH= - log [0.0025 M]
pH = 2.60
The pH of a solution of 0.0025M H₂SO₄ is 2.3 means the solution is highly acidic.
How do we calculate pH?pH of any solution will be calculated by using the below equation as:
pH = -log[H⁺]
Given that concentration of H₂SO₄ = 0.0025M
Let the volume of the acid is 1 liter means 0.0025 moles of H₂SO₄ are present.
1 moles of H₂SO₄ produces 2 moles of H⁺ ion So 0.0025 moles of H₂SO₄ produces 2(0.0025) = 0.0050 moles of H⁺ ion.In 1 liter of solution 0.005 M of H⁺ ions are present. On putting this value in pH equation, we get
pH = -log(0.005)
pH = -(-2.3) = 2.3
Hence required pH of solution is 2.3.
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Explain why ALL organisms need a source of food.
Answer:
We would die.
Explanation:
Organisms cannot function properly without food. We would essentially die of starvation or possibly malnutrition. I can imagine this being a rather painful way of dying.
Final answer:
All organisms, including humans and microorganisms, need to consume food to gain the energy required for growth, reproduction, and other metabolic activities. This energy is derived from photosynthesis in some organisms, while others obtain it by eating organisms that have stored chemical energy.
Explanation:
Why All Organisms Need a Source of Food
All organisms need a source of food because they require energy to perform life-sustaining activities such as growth, reproduction, maintenance of their structures, and response to their environments. For microorganisms and humans alike, nutrients are crucial for survival. The energy needed for metabolic activities originates from food - with its stored energy coming from a process known as photosynthesis, where some organisms convert sunlight into chemical energy stored in food. Others consume organic materials to acquire this chemical energy, fueling cellular functions and enabling evolution over time.
Which statement best describes the relationship between wavelength and
frequency?*
Help please!!
Answer:
The longer the wavelength, the lower the frequency. It works vice versa as well - the shorter the wavelength, the higher the frequency.
Explanation:
Wavelength is the length from crest to crest or trough to trough, so the shorter that distance is, the more frequent the wave will be.
What do you call the gravitational attraction between you and the earth?
Answer: weight
Explanation:
Carbon Dioxide, CO2, is an Element?
A) True
B) False
C) Im not sure. I need more help with this topic
Answer:
false
Explanation:
element are one type of atom so CO2 is a compound because it is two type of elements with chemical bond.
What type of intermolecular bond occurs between two water molecules?
dipole to dipole
hydrogen
ionic
polar covalent
Answer:
hydrogen bond is the intermolecular bond
One major cause of flood is
Answer:
Localized flooding may be caused or exacerbated by drainage obstructions such as landslides, ice, debris, or beaver dams. Slow-rising floods most commonly occur in large rivers with large catchment areas. The increase in flow may be the result of sustained rainfall, rapid snow melt, monsoons, or tropical cyclones.
Explanation:
It takes 12.5mL of a 0.30M HCl solution to neutralize 285mL of NaOH solution.
What is the concentration of the NaOH solution?
Final answer:
To find the concentration of the NaOH solution, the moles of HCl used in the neutralization were calculated and, due to the 1:1 molar ratio of the reaction, were equivalent to the moles of NaOH. The number was then divided by the volume of the NaOH solution to find its concentration, which is 0.01316 M.
Explanation:
The question requires a calculation based on the concept of titration in chemistry, which is used to determine the concentration of an unknown solution. The balanced chemical equation for the neutralization reaction is HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l). Since it takes 12.5 mL of a 0.30 M HCl solution to neutralize 285 mL of NaOH solution, we start by calculating the number of moles of HCl used using the equation:
n = C × V, where n is the number of moles, C is the concentration in molarity, and V is the volume in liters.
nHCl = 0.30 moles/L × 0.0125 L = 0.00375 moles
Since the reaction between HCl and NaOH is a 1:1 molar ratio, the moles of NaOH will also be 0.00375. To find the concentration (molarity) of NaOH, we use:
M = n/V
MNaOH = 0.00375 moles / 0.285 L = 0.01316 M
Therefore, the concentration of the NaOH solution is 0.01316 M.
Elizabeth is pushing against a wall as she stretches before exercising as shown below. The wall pushes back against Elizabeth's hands with the same force in the opposite direction. Which of Newton's laws does this best demonstrate? A. Newton's universal law of gravitation B. Newton's third law of motion C. Newton's second law of motion D. Newton's first law of motion
Answer:
Newton's third law of motion
Explanation:
According to Newton's third law of motion, for every action force there is an equal and opposite reaction force. In this case, the action force is Elizabeth pushing against the wall with her hands. As this happens, there is an equal and opposite reaction force in which the wall pushes back on Elizabeth's hands.
Final answer:
The scenario where Elizabeth pushes against a wall and the wall pushes back with equal force demonstrates Newton's third law of motion.
Explanation:
When Elizabeth is pushing against the wall and the wall pushes back with an equal and opposite force, this illustrates Newton's third law of motion. According to this law, for every action, there is an equal and opposite reaction. This means that the forces are equal in magnitude but act in opposite directions on different systems, which is why they don't cancel out. An example to further explain this is a swimmer who pushes against the wall of a pool with her feet, and consequently, the wall pushes back on the swimmer, propelling her in the opposite direction of the push.
By applying Newton's third law, we can understand that when Elizabeth pushes against the wall, the wall pushes back on her hands with an equal force in the opposite direction. This law helps us understand the relationship between forces in a given interaction.
Remember, Newton's first law of motion (D) states that an object at rest stays at rest, and an object in motion stays in motion with the same speed and direction unless acted upon by an external force.
When dissolved sodium hydroxide reacts with hydrogen sulfate, aqueous sodium, sulfate, water, and heat are formed. Write out the balanced equation for this
reaction and indicate what the coefficients are from left to right. (Note: Be sure to
keep the reactants and products in the same order that they appear in the
question.)
a) 2,1,1,2
b) 4,2,2,4
c) 1,1,1,1
d) 1,2,2,1
a) 2,1,1,2
When dissolved sodium hydroxide reacts with hydrogen sulfate, aqueous sodium, sulfate, water, and heat are formed.
This reaction is known as Neutralization reaction. Since a base and acid reacts together to produce a salt.
Lets, write balanced chemical equation:
2NaOH + H₂SO₄→ Na₂SO₄+ 2H₂O +HeatAs we see, the number of each atom on reactants is same as number of each atom on product. Thus this chemical equation is balanced.
Therefore, option a) is correct.
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The balanced chemical equation for the reaction of sodium hydroxide with hydrogen sulfate to form aqueous sodium sulfate, water, and heat is H₂SO₄ (aq) + 2NaOH(aq) → Na₂SO₄ (aq) + 2H₂O(l), with coefficients of 1, 2, 1, 2 from left to right, corresponding to answer (a).
Explanation:When dissolved sodium hydroxide reacts with hydrogen sulfate, the balanced chemical equation is:
H₂SO₄ (aq) + 2NaOH(aq) → Na₂SO₄ (aq) + 2H₂O(l)
The coefficients for this reaction from left to right are 1, 2, 1, and 2 respectively, which corresponds to answer (a) 2,1,1,2.
This reaction shows that sulfuric acid (H₂SO₄) is neutralized by sodium hydroxide (NaOH) to form sodium sulfate (Na₂SO₄) and water (H₂O). A mole ratio of 1:2 between sulfuric acid and sodium hydroxide is necessary to completely neutralize the acid, which shows the stoichiometric relationship between the reactants.
Molecules _____.
A) are named according to the alphabet
B) are the smallest units of matter
C) must be made of two different elements
D) are made of two or more atoms
Answer:
D
Explanation:
A is incorrect because they are named by elements and the number of atoms.
B is incorrect because the smallest units of matter are usually considered to be atoms.
C is incorrect because O2 is considered a molecule, and is made of only one element.
So, D is correct, because molecules are groups of two or more atoms that are held together by chemical bonds.
Answer:
D
Explanation:
What vocabulary term refers to the offspring when it possessing the same trait for both genes?
Answer:
Homozygous
Explanation:
Homozygous is a word that refers to a particular gene which possesses identical alleles on both homologous chromosomes. It is referred to by two capital letters (YY) for a trait that is dominant, and two lowercase letters (yy) for a trait that is recessive.
Therefore, if an organism possesses two copies of the same allele, for example AA or aa, then that means it is homozygous for that particular trait.
The vocabulary term that refers to the offspring possessing the same trait for both genes is homozygous.
Homozygous organisms have an identical pair of alleles for a specific gene, meaning that both copies of the gene they've inherited from their parents are the same. This contrasts with heterozygous organisms, which have two different alleles for a gene. While both homozygous and heterozygous genotypes can result in the same phenotype due to dominant and recessive alleles, the actual genetic makeup, or genotype, differs between them.
In the classic example, when true-breeding parents with genotypes GG (homozygous dominant) and gg (homozygous recessive) are crossed, all resulting offspring would be Gg, which are heterozygous for the gene in question. However, if GG is crossed with another GG or gg with gg, the offspring are also homozygous.