Answer:
7.875 grams
Explanation:
You multiply 175 g by .045
This gives you 7.875 grams of lactose
Final answer:
The mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, is 7.875 grams.
Explanation:
Mass is a fundamental physical quantity that represents the amount of matter in an object. It is a scalar quantity, meaning it has magnitude but no direction. Mass is typically measured in units such as kilograms (kg) or grams (g). In classical mechanics, mass plays a crucial role in determining an object's inertia, which is its resistance to changes in motion.
To calculate the mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, you can use the following formula:
Mass of lactose = (Percentage of lactose by mass) × (Total mass of the milk)
Mass of lactose = 0.045 × 175 g = 7.875 g
Therefore, the mass of lactose present in 175 g of milk is 7.875 grams.
Are gases more or less dense than liquids or solids at room temperature?
Answer:
less denser
Explanation:
soild
solid (steel) is the most dense,
gas
the gas (air) is the least dense
liquid
the density of the liquid (water) is in between
A gas sealed in a drum container occupies 7.70 L at a sizzling 325C degrees. What will the volume be if the drum is quickly chilled at 9C degrees.
The volume of the drum after chilled quickly is 3.6 L.
Explanation:
As per the Charles Law, for any gas at constant pressure, volume of the gas is in direct proportion with the temperature measured in Kelvin. As the temperature increases, the gas expands and vice versa.
[tex]$\frac{V1}{T1} = \frac{V2}{T2} \\[/tex]
After chilling the drum, the volume will get reduced and it can be found as,
V2 = [tex]$\frac{V1T2}{T1}[/tex]
= [tex]$\frac{7.7 L \times 282 K}{598 K}[/tex]
= 3.6 L
Here the drum is chilled quickly, that is temperature is reduced and so the volume also decreases.
Read the temperatures shown to the nearest 0.5°C.
40
Е
с
DONE
DONE
Answer: 37.0 °C , 42.5 °C
Explanation:
Answer:
1st one - 37.0
2nd one - 42.5
Explanation:
What type of simple machine is found on a water bottle cap
Answer:
A Lever
Explanation:
ZnCl2 is used in soldering flux, an alloy used to join two metals together. Determine the moles of Cl- ions in 2.50 mol ZnCl2.
5.00 mol Cl-
0.500 mol Cl-
1.75 mol Cl-
15.0 mol Cl-
Answer : The number of moles of [tex]Cl^-[/tex] ions are, 5.00 mole.
Explanation :
When 1 mole of [tex]ZnCl_2[/tex] dissociates then it gives 1 mole of [tex]Zn^{2+}[/tex] ion and 2 moles of [tex]Cl^-[/tex] ions.
As we are given that there are 2.50 mole of [tex]ZnCl_2[/tex].
Now we have to determine the number of moles of [tex]Cl^-[/tex] ions.
As, 1 mole of [tex]ZnCl_2[/tex] dissociate to give 2 moles of [tex]Cl^-[/tex] ions.
So, 2.50 mole of [tex]ZnCl_2[/tex] dissociate to give [tex]2\times 2.50=5.00[/tex] moles of [tex]Cl^-[/tex] ions.
Therefore, the number of moles of [tex]Cl^-[/tex] ions are, 5.00 mole.
There are 5.00 moles of Cl- in 2.50 moles of ZnCl2.
We have that the amount of moles of ZnCl2 is equal to 2.50 moles, so, according to the equation that forms this compound we can say that:
[tex]Zn + 2Cl[/tex] ⇒[tex]ZnCl_{2}[/tex]
So, 1 mole ZnCl2 of decomposes as 1 Zn ion and 2 Cl ions, that is, the number of moles of chlotide is twice the number of moles of ZnCl2:
[tex]2 \times 2.50 = 5.00 moles[/tex]
So, there are 5.00 moles of Cl- in 2.50 moles of ZnCl2.
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The element silver has both physical and chemical properties, some of which do not change when the size of the sample changes. Which of these choices is a physical property that does not change when the size of the sample changes? flammability volume density reactivity with oxygen
I believe that the answer is density.
Reason being is because the density of an object does not change when an object changes size.
The physical properties are the physical modifications like color, conductivity, shape, etc. Density does not vary with changes in size.
What are physical properties?Physical properties are the reversible properties related to the appearances, melting and the boiling point, conductivity, density, shininess, etc.
The density of the silver element does not vary with changes in the size of the sample as it is a physical property and is constant. The volume is the physical property that varies with size and flammability and reactivity with oxygen are chemical properties.
Therefore, option C. density is the physical property that will not vary with size.
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A solution of I3¯(aq) can be standardized by using it to titrate As4O6(aq). The titration of 0.1021 g of As4O6(s) (MW = 395.68) dissolved in of water requires 36.55 mL of I3¯(aq). Calculate the molarity of the I3¯(aq) (Reaction ratio is 4 mol I3¯ / 1 mol As4O6)
Answer:
[tex]\large \boxed{\text{0.028 24 mol/L}}[/tex]
Explanation:
1. Balanced chemical equation.
The unbalanced equation is
As₄O₆ + I₃⁻ ⟶ H₃AsO₄ + I⁻
The balanced equation is
1As₄O₆ + 4I₃⁻ + 10H₂O ⟶ 4H₃AsO₄ + 12I⁻ + 8H⁺
2. Moles of As₄O₆
[tex]\text{Moles of As$_{4}$O}_{6} =\text{ 0.1021 g As$_{4}$O}_{6} \times \dfrac{\text{1 mol As$_{4}$O}_{6}}{\text{395.68 g As$_{4}$O}_{6}} = 2.580 \times 10^{-4} \text{ mol As$_{4}$O}_{6}\\\\=\text{0.2580 mmol As$_{4}$O}_{6}[/tex]
3. Moles of I₃⁻
[tex]\text{Moles of I}_{3}^{-} = \text{0.2580 mmol As$_{4}$O}_{6} \times \dfrac{\text{4 mmol I}_{3}^{-}}{\text{1 mmol As$_{4}$O}_{6}} =\text{1.032 mmol I}_{3}^{-}[/tex]
4. [I₃⁻]
[tex]c = \dfrac{\text{1.032 mmol }}{\text{36.55 mL }} = \textbf{0.028 24 mol/L}\\\text{The concentration of I$_{3}^{-}$ is $\large \boxed{\textbf{0.028 24 mol/L}}$}[/tex]
The molarity of the iodide ion in the given solution has been 0.028 M.
The balanced chemical reaction can be given as:
[tex]\rm As_4O_6\;+\;4\;I^3^-\;+\;10\;H_2O\;\rightarrow\;4\;H_3AsO_4\;+\;12\;I^-\;+\;8\;H^+[/tex]
Moles of [tex]\rm \bold{As_4O_6}[/tex] = [tex]\rm \dfrac{0.1021}{395.68}[/tex]
Moles of [tex]\rm \bold{As_4O_6}[/tex] = 0.2580mmol
Moles of [tex]\rm \bold{I^3^-}[/tex] = [tex]\rm moles\;of\;As_4O_6\;\times\;ratio\;of\;\dfrac{I^3^-}{As_4O_6}[/tex]
Moles of [tex]\rm \bold{I^3^-}[/tex] = 0.2580 [tex]\rm \times\;\dfrac{4}{1}[/tex]
Moles of [tex]\rm \bold{I^3^-}[/tex] = 1.032 mmol
Molarity = [tex]\rm \dfrac{moles}{volume\;(L)}[/tex]
Molarity = [tex]\rm \dfrac{1.032\;\times\;10^-^3}{36.55\;\times\;10^-^3}[/tex]
Molarity = 0.028 M
The molarity of the iodide ion in the given solution has been 0.028 M.
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Which of these is a product of photosynthesis and a requirement
for cellular respiration?
Select one:
sunlight
carbon dioxide
glucose
water
Answer:
glucose
Explanation:
Glucose is the product of photosynthesis that is required for cellular respiration, serving as an energy source converted into ATP. Option C is correct.
The product of photosynthesis that is also a requirement for cellular respiration is glucose. Photosynthesis uses sunlight, carbon dioxide (CO₂), and water (H₂O) to produce glucose (C₆H₁₂O₆) and oxygen (O₂). While glucose is utilized as a source of energy during cellular respiration, oxygen is also involved in this process but is not considered a product of photosynthesis that is used in cellular respiration.
Glucose is the crucial link between these two processes, serving as the energy source that cellular respiration converts into ATP (adenosine triphosphate), the energy currency of the cell.
Hence, C. is the correct option.
The complete question is:
Which of these is a product of photosynthesis and a requirement
for cellular respiration?
Select one:
A) sunlight
B) carbon dioxide
C) glucose
D) water
Consider the following step of a reaction mechanism.
A+B___>D+E (slow)
Which statement identifies a reaction intermediate?
A, if it is used in a later step
B, if it is produced in an earlier step
D, if it is used in an earlier step
E, if it is produced in a later step
Answer:
i think it's D I'm not sure...
Answer:
b, if it produced in an earlier step
Explanation:
i got it right :) hope this helps!!
You have a 20 gram piece of aluminum and a 40 gram piece of aluminum sitting in the sun. Which piece of aluminum will increase by ten degrees first? What is your evidence and reasoning?
Since the 2 pieces are made of the same material (aluminum), they have the same specific heat. Then the piece of lower mass will warm up faster.
ΔT = Q/(mc)
They both receive the same heat transfer Q from the sun, they both have the same specific heat c, so the one of lower mass m attains the higher temperature rise ΔT over the same time interval.
The 20-gram piece of aluminum will heat up by ten degrees faster than the 40-gram piece because it has less mass. This is based on the properties of heat capacity, represented by the formula for heat transfer Q = mcΔT.
Explanation:This question is about heat capacity, a concept in physics related to the thermal properties of materials including aluminum. The heat capacity of an object determines how much it will heat up for a given amount of heat applied. It is determined by an object's mass and the specific heat of its material.
As both objects in question are made of aluminum, the specific heat of the material is the same, and thus the only factor that makes a difference is the mass. The heat capacity of an object is proportional to its mass, so a larger object will take longer to heat up. Consequently, the 20-gram piece of aluminum will heat up faster than the 40-gram piece.
This is because less energy is needed to cause a given temperature increase in a smaller mass than in a larger mass, due to the direct proportionality of heat, mass, and temperature change. This is represented by the formula for heat transfer Q = mcΔT, where Q is the heat transferred, m is the mass, c is the specific heat, and ΔT is the change in temperature.
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What will happen if an electric current is flowing through a cord and a magnet is brought near the cord?
The choices are
The resistance of the wire will decrease
It will exert a force on the voltage
It will exert a force on the electric current
The electric current will stop flowing
Answer:
The magnet will exert a force on the electric current
Explanation:
The electric current flowing through the cord will experience magnetic force due to presence of magnetic field created by the magnet brought near it.
The magnitude of the magnetic force experienced by this flowing current is given as;
F = qvB
where;
q is charge of electron (measured in coulomb's, C)
v is the speed of the flowing current (m/s)
B is the magnetic field strength (T)
Therefore, the magnet will exert a force on the electric current
_______is a form of asexual reproduction that occurs when an offspring grows from a piece of its parent
Answer:
vegetative reproduction
Explanation:
Answer:
Animal Regeneration
- If I initially have a gas at a pressure of 379 mmHg, a volume of 467 mL, and a temperature of
31°C, and then I raise the pressure to 621 mmHg and increase the temperature to 49°C, what
is the new volume of the gas?
Answer:
301.89 mL
Explanation:
- Use combined gas law formula
- Rearrange that formula to fit values then plug them in.
- Be sure to change C to K
Hope that helped! Let me know if you need further explanation.
In the polypeptide Phe-Tyr-Glu-Asp-Ser-Ile-Leu-Ser what is the N-terminal amino acid?
and
What is the C-terminal amino acid?
Answer:
N-terminal Phe, C-terminal Ser
Explanation:
Amino acids connect like
NH2 -CH(R1) -CO -NH-CH(R2)-CO-.....-NH-CH(Rn)COOH
So, 1st amino acid is N -terminal , and it is Phe.
Last amino acid is C- terminal, and it is Ser.
How many moles are in 1.0 x 109 atoms of Zn?
Answer:
1.66×10^-15
Explanation:
the explanation is in the picture
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protein in foods are broken down into amino acids through what process? Explain your answer.
a. adsorption
b. elimination
c. chemical digestion
d. mechanical digestion
Final answer:
Proteins in food are broken down into amino acids through chemical digestion, a process that takes place mainly in the small intestine with the help of enzymes. This is different from mechanical digestion, which physically breaks down food without changing its chemical composition. The resulting amino acids are then absorbed in the small intestine.
Explanation:
Proteins in foods are broken down into amino acids through the process of chemical digestion. This process involves the reduction of complex proteins into their chemical building blocks, amino acids, which can then be absorbed into the bloodstream to nourish the cells of the body. Most of chemical digestion occurs in the small intestine, particularly in the duodenum, where enzymes break down proteins. It is important to differentiate this process from mechanical digestion, which refers to the physical breakdown of food into smaller pieces through actions such as chewing, without altering the chemical composition of the food.
The absorption of nutrients, primarily in the small intestines, follows digestion. The amino acids, once liberated from the proteins by chemical digestion, are absorbed through the walls of the small intestine and enter the bloodstream for distribution to the body's cells. This process is fundamental because proteins in the diet are not directly absorbed but must first be broken down into their constituent amino acids.
Simulation ionic and covalent bonding
An atom has +14 Protons, 15 Neutrons, and -14 Electrons, what is the charge of it’s nucleus?
Answer:
Neutral
Explanation:
The protons and Electrons are equal, so the cancel out each other's charge This leaves the Neutral charge of Neutrons, so, the Atom of Silicon is Neutral.
The charge of an atom's nucleus is determined by its number of protons. In this case, the nucleus has a +14 charge.
Explanation:The nucleus of an atom contains its protons and neutrons. The charge of the nucleus is determined by the number of protons because neutrons do not carry a charge. Therefore, an atom with +14 protons would have a +14 charge in its nucleus, because the protons each have a +1 charge, irrespective of the number of neutrons or electrons.
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What energy transformations occur when using a curling iron?
Answer:
chemical energy to thermal energy
Explanation:
Then the person must click the on button once this occurs the electrical energy is transformed into thermal energy. There are other types of flat irons such as using water to create steam to straighten the hair or using a chemical called butane this is chemical energy which is later transformed into thermal energy.
Explanation:
Electrical energy is transformed to heat energy when the curling iron stays on. Heat energy is transferred to the hair that is being curled.
Which type of decay does not involve the decaying atom's atomic number to change?
a) alpha decay
b) beta decay
c) gamma decay
d) delta decay
please help me
Answer:
c-gamma decay
Explanation:
In gamma decay, neither the atomic number or the mass number is changed
Which of the following compounds will behave MOST like an ideal gas at higher pressures? a) He b) SO2 c) H2 d) N2 e) F2
Answer:
Option A
He
Explanation:
Ideal gas: refers to a type of gas having a perfectly elastic collisions between atoms or molecules with no intermolecular attractive forces. Helium is the most ideal gas amongst the given options because it exists as a single atom, with a low boiling point with a very low or even zero intermolecular interaction.
SO2 is less volatile having more intermolecular interaction (van da waal interaction, this is the reason for it's deviation from ideality).
H2 almost behaves like an idea gas because it has a low intermolecular interaction not zero.
N2 is not an ideal gas
F2 is not the most ideal gas.
Final answer:
Helium (He)- (a) is most likely to behave like an ideal gas at higher pressures due to its minimal intermolecular forces and very small atomic radius, which make its behavior under such conditions closer to the assumptions of the ideal gas law.
Explanation:
The compound that will behave most like an ideal gas at higher pressures is helium (He). Ideal gas behavior assumes that there are no intermolecular forces between the gas particles and that the volume of the gas particles themselves is negligible compared to the container. Helium, being a noble gas with a single atomic structure, has minimal intermolecular forces and a very small atomic radius, making it less likely to deviate from ideal behavior even at higher pressures. Furthermore, helium's atoms are significantly smaller than molecules like SO₂, H₂, N₂ or F₂, which means that the volume the particles take up is less significant. Real gases such as SO₂ and F₂ have stronger intermolecular forces due to their larger size and molecular structure, which will cause these gases to deviate from ideal gas behavior more than helium under the same conditions. Therefore, amongst the options provided, helium will behave most similarly to an ideal gas at higher pressures.How many moles are in 23.4 g
Answer:
0.211 mol CaCI2
Explanation:
on edge
The molar mass of nitrogen gas N₂ is 28 g/mol. Thus, the number of moles present in 23.4 g is 0.83 moles.
What is dinitrogen?Nitrogen is 7the element in periodic table. It exists in diatomic state or molecular state as N₂ gas. Two nitrogen atoms are covalently bonded together through sharing of three electrons each.
One mole of any element contains 6.022 × 10²³ atoms. This number is called Avogadro number. The mass of one mole of a substance is called its molar mass.
The atomic mass of N is 14 g/mol. Thus, for N₂ the mass is 28 g/mol. Hence, one mole of nitrogen gas weighs 28 g. The number of moles in 23.4 g of N₂ is calculated as follows:
Number of moles = weight / molar mass
= 23.4 g/28 g/mol
= 0.83 moles.
Therefore, the number of moles of N₂ in 23.4 g is 0.83.
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Your question is incomplete. But your complete question probably was:
How many moles are in 23.4 g of N₂.
Julissa combined baking soda and calcium chloride solution in a beaker. she observed bubbling and a white solid formed. Julissa completed the reaction again after warming the solutions. What changes will julissa most likely see in the warmer reaction.?
A) The bubbling and white solid formation would occur faster
B)The bubbles and white solid formation would happen slower
C) The bubbling or white solid formation would not be created at all
D) Only the bubbling would occur, but no white solid particles would from.
(50 points pls help)
Answer:
A
Explanation:
With chemical reactions, there are various factors that affect the rate of the reaction. One of these is temperature.
When you raise the temperature, the reaction will move faster. Why? Temperature is directly correlated with the kinetic energy (basically, the energy that makes the particles move). Higher temperatures mean higher kinetic energies. Particles with higher kinetic energies move faster, which makes them more likely to collide. When collisions occur more frequently, the reaction follows through more quickly.
Thus, when Julissa warms the solutions, she will see that bubbling and white solid formation (the products of the reaction) occus faster. So, the answer is A.
Hope this helps!
How would you identify distance traveled on a line
Answer:
depends how long the line is
Explanation:
if the line is short then the distance is short if its long then the distance is long
What substance is removed from the air by living things for respiration?
Answer:
If i'm correct it is carbon dioxide. If i'm not correct sorry!
Explanation:
To solve this we must be knowing each and every concept behind respiration. Therefore, oxygen is the substance which is removed from the air by living things for respiration.
What is respiration?Respiration is a mechanism that happens within cells to produce energy by breaking down glucose molecules. The process may be neatly separated into two groups based on the usage of oxygen: anaerobic and aerobic respiration.
Many people believe that humans as well as other multicellular creatures solely employ aerobic respiration. This is countered by the fact that human muscles perform anaerobic respiration during strenuous activity, creating lactic as a waste byproduct instead of carbon dioxide. Oxygen is the substance which is removed from the air by living things for respiration.
Therefore, oxygen is the substance which is removed from the air by living things for respiration.
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If I have 0.75 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres, what is the volume of the gas
Answer:
the volume is 20 just subtract
Explanation:
0.25 miles of sodium chloride is dissolved to make 0.05 liters of solution. What is the molarity
A: 2 M
B: 5 M
C: 4 M
D: 3 M
M+e → M?
Has M lost or gained an electron?
Answer:
m lost an electron coz it transffered it
Which of the scientists responsible for cell theory would be the most likely to write a book titled Cells Come from Cells?
Hooke
Schleiden
Virchow
Schwann
Answer:
I am not sure but DO NOT PICK SCHWANN.
Explanation:
That other person is wrong. Maybe it is Virchow. Sorry if I am wrong.
The scientist most likely to write a book titled 'Cells Come from Cells' is Rudolf Virchow, as he popularized the idea that all cells arise from pre-existing cells.
Explanation:The scientist most likely to write a book titled Cells Come from Cells is Rudolf Virchow. Virchow is known for popularizing the concept that all cells arise from pre-existing cells, an idea that greatly contributed to the development of the modern cell theory. This statement became known as `Virchow's Law' or 'Omnis cellule e cellula', which means 'every cell comes from a cell'.
Other scientists such as Hooke, Schwann, and Schleiden made key contributions to the cell theory as well, but their work focused on different aspects. Hooke, for example, first identified and named cells, but did not propose their mode of formation. Similarly, Schwann and Schleiden identified that both plants and animals are made up of cells.
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Does the coronavirus have DNA or RNA?
Answer:
The coronavirus has RNA?
Explanation:
Coronaviruses are important human and animal pathogens and contain an extraordinarily long (27-31 kb) RNA genome. Its RNA synthesis involves complex mechanisms of regulation, similar to those of DNA viruses. In this treatise, mouse hepatitis virus (MHV) is used as a model for the discussion of the mechanism of viral RNA synthesis. We show that MHV RNA synthesis requires interactions of multiple RNA components, which are likely mediated by protein-RNA and protein-protein, as well as RNA-RNA, interactions. This virus also provides a unique example of a discontinuous transcription mechanism, which involves a trans-acting RNA component. Finally, study of the cis-acting signals for the various steps of RNA synthesis revealed an insight into the regulation of viral RNA synthesis. This discussion suggests that the regulation of RNA synthesis in coronavirus is more complex than previously thought possible for RNA viruses. Coronavirus RNA transcription and replication may serve as a paradigm of RNA synthesis for RNA viruses in general.