Answer:Water is entirely composed of hydrogen and oxygen Being composed of such elusive and invisible elements
Explanation:this is helped to be clear by oxygen and invisible elements like nutrients
Pls tell me the answers for the ones that aren’t answered
Answer:
2 - B, 5 - D, 6 - A
Explanation:
2 - Penicilin was actually discovered on accident!
5 - Microbes were discovered around the mid-1600s
6 - Choice A seems to be correct here, noting that the answers of C and D are marked out and B seems a bit far-fetched (from my current knowledge)
Why does a solute depress the freezing point?
A) because the solute has bigger molecules than the solvent
B) because the solute disrupts crystal formation by the solvent
C) because the solute is colder than the solvent
D) because the solute tends to sink to the bottom of the solution
Answer: Option (B) is the correct answer.
Explanation: Freezing point depression is defined as the decrease in temperature of freezing of a solvent when a non-volatile solute is added into it.
This decrease in temperature arises because addition of solute particles into the solvent tend to disrupt the crystal formation of the solvents.
As a result, particles does not come closer to each other. Hence, we need to provide more lower temperature due to which there will be formation of crystal lattice in order to form the solid.
Thus, we can conclude that a solute depress the freezing point because the solute disrupts crystal formation by the solvent.
Question 1:
Moles - If a solution contains 0.02 g of Thiamine (vitamin B1) and has the molecular formula
C12H17N4OS
How many moles are present in the solution?
Explanation:
mole=mass/molar mass
molar mass of c12H17N4OS
12×12+17+14×4+16+32
=265
molar mass=265
mole=0.02/265
which of these sets of elements has similar properties? responses strontium, magnesium, calcium, beryllium strontium, magnesium, calcium, beryllium chromium, magnesium, iron, cobalt chromium, magnesium, iron, cobalt hydrogen, helium, neon hydrogen, helium, neon oxygen, nitrogen, carbon
A 3.2 L sample of a gas at 2 atm of pressure is expanded until its volume is 5 L. What will be thepressure in atm of the expanded gas sample? Include proper units (abbreviated). Round your answer to two decimal places.
1.28atm
Explanations:According to Boyle's law
P1V1 = P2V2
where
P is the pressure
V is the volume
Given the following
P1 = 2atm
V1 = 3.2L
V2 = 5L
Required
Final pressure P2
Substitute
P2 = P1V1/V2
P2 = 2*3.2/5
P2 = 6.4/5
P2 = 1.28atm
Hence the pressure in atm of the expanded gas sample
when 4.14 moles of ibr gas is initially injected into a 1 l container at 150 c, the kc for this reaction is 8.5 calculate the equilibrium concentration of i2
By using the expression for the equilibrium constant for the reaction and solving the appropriate quadratic equation, we can calculate that the equilibrium concentration of iodine will be 1.77 M.
The balanced reaction equation for this reaction looks like this:
[tex]2 IBr[/tex] → [tex]I_{2}+Br_{2}[/tex]
The expression for the equilibrium constant will look like this:
[tex]K_{c} =\frac{[I_{2} ][Br_{2} ]}{[IBr]^{2} }[/tex]
Because all the volumes are the same, we can just use the moles of all reaction components instead of concentrations. Now, because there was no iodine or bromine when the reaction began, all iodine and bromine present at equilibrium are formed by IBr decomposition, their concentrations will be the same (X). The concentration of IBr will be reduced by 2X, so we can plug that into the equilibrium constant expression:
[tex]8.5=\frac{X^{2} }{(4.14-2X)^{2} }[/tex]
We transform this expression to get a quadratic equation:
33X² - 140.76X + 145.6866 = 0
When we solve for X, one solution is 2.49 M (which is impossible, because 4.14 moles of IBr can create a maximum of 4.14 mol / 2 = 2.07 mol of iodine), and the other (correct) solution is 1.77 M.
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The relative abundance and atomic masses are: 30.8% for mass of 64.93u
Answer:
The element copper has naturally occurring isotopes with mass numbers of 63 and 65. The relative abundance and atomic masses are 69.2% for mass = 62.93 amu, and 30.8% for mass = 64.93 amu.
as you climb to the top of a hypothetical mountain in florida, air pressure decreases from 1 atm to 0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain?
As you climb to the top of a academic mountain in florida, air pressure decreases from 1 atm to0.75 atm at the peak. what will the partial pressure of oxygen be at the top of the mountain.
Pressure
Pressure( symbol p or P) is the force applied vertical to the face of an object per unit area over which that force is distributed.
Colorful units are used to express pressure. Some of these decide from a unit of force divided by a unit of area; the SI unit of pressure, the pascal( Pa), for illustration, is one newton per forecourt metre( N/ m2); also, the pound- force per forecourt inch( psi) is the traditional unit of pressure in the Homeric and U.S. customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere( atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units similar as the centimeter of water, millimeter of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.
Pressure is the quantum of force applied vertical to the face of an object per unit area. The symbol for it's" p" or P.( 2) The IUPAC recommendation for pressure is a lower- case p.( 3) still, upper- case P is extensively used. The operation of P vs p depends upon the field in which one is working, on the near presence of other symbols for amounts similar as power and instigation, and on writing style.
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what is the order of chemical process in the synthetic cycle for generation of fatty acid? what is the order of chemical process in the synthetic cycle for generation of fatty acid? condensation, dehydration, reduction and reduction reduction, dehydration, condensation and reduction condensation, reduction, dehydration and reduction reduction, condensation, dehydration and reduction
The order of synthetic cycle for generation of fatty acid is Condensation > Reduction > Dehydration > Reduction.
What is fatty acid?
An aliphatic carboxylic acid with a saturated or unsaturated chain is referred to as a fatty acid and is employed in chemistry, particularly in biochemistry. In some species, like microalgae, fatty acids make up a significant portion of the lipids (up to 70% of the total weight). However, in some other creatures, such as triglycerides, phospholipids, and cholesteryl esters, fatty acids are not found in their freestanding form. In all of these forms, fatty acids are essential nutritional sources of energy for animals and essential cellular building components.
The synthetic synthetic cycle for the generation of fatty acids takes place in such a way that at first Condensation happens then Reduction then Dehydration then again Reduction happens.
The cycle of condensation, reduction, dehydration, and reduction continues until palmitoyl‐ACP gets completely made.
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The electron configurations of two unknown atoms are shown.
Electron Configuration
Based on the electron configuration of each atom, what is the number of valence electrons for each atom?
a Atom X = 1; Atom Y = 1
b Atom X = 1; Atom Y = 7
c Atom X = 10; Atom Y = 10
d Atom X = 11; Atom Y = 17
Answer:
b Atom X = 1; Atom Y = 7
Explanation:
a valence electron is an electron in the outer shell
So X has 1 in outer shell
Y has 7 in outer shell
1. Which of the following surfaces does NOT absorb moisture? *
OCardboard
O Metal
Magazine cover
Rough wood
Metal of the following surfaces does NOT absorb moisture.
The correct option is B.
How would you define moisture?The presence of a liquid, things like water, even in minute amounts, is referred to as moisture. Examples of locations where small amounts of water can be found include the air (humidity), foods, and some commercial goods. The amount of water vapor in the atmosphere is also alluded to as moisture.
What causes moisture?Warm, moist weather that comes in touch with a cool surface, such uninsulated cold water mains, causes moisture to condense into water droplets. Numerous other represent the lowest including cooking, taking a bath, drying clothing, washing the dishes, and others also release moisture into the air.
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The complete question is -
Which of the following surfaces does NOT absorb moisture? *
A-Cardboard
B- Metal
C-Magazine cover
D-Rough wood
Determine what elements are denoted by the following electron configurations:
6) 1s²2s²2p 3s²3p4
7) 1s²2s²2p 3s²3p64s²3d¹04p65s¹
8) [Xe] 6s²4f¹2
9) [Xe] 6s4f45d10
10) [Ne]3s²3p4
The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
What is electron configurations?
One orbital can house a maximum of two electrons, and there are four different types of orbitals (s, p, d, and f). More electrons can be held in the p, d, and f orbitals since they contain various sublevels. Each element's position on the periodic table determines the specific electron configuration of that element. The arrangement of an atom's or molecule's electrons in atomic or molecular orbitals is known as the electron configuration in atomic physics and quantum chemistry.
A standardized notation is used for expressing electron configurations, in which the energy level and type of orbital are written first, followed by the number of electrons in the orbital, which is expressed in superscript. For instance, carbon's (atomic number: 6) electronic configuration is 1s22s22p2.
Hence. The elements are denoted by the electron configurations are,
1) Beryllium
2) Boron
3) Magnesium
4) Silicon
5) Phosphorus
6) Calcium
7) Nickel
8) Krypton
9) Bromine
10) Strontium
The complete question is,
Determine the elements denoted by the following electron configurations.
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which of the folllowing is the Arrhenius definition of an acidl
Answer:
Arrhenius defined an acid as a compound that increases the concentration of hydrogen ion (H +) in aqueous solution. Many acids are simple compounds that release a hydrogen cation into solution when they dissolve.
A sealed weather balloon contains 10.0 L of helium gas at 5 °C. What is the volume of helium in the weather balloon at 15 °C?
Volume of the helium in weather balloon at 15 °C with initial volume of 10L and temperature of 5 °C is 30 L
Given that, Initial volume (V1) = 10 L
Initial Temperature (T1) = 5 °C
Final Temperature (T2) = 15 °C
By gas law,
V1 / V2 = T1 / T2 (Pressure constant)
10 / V2 = 5 / 15
V2 = (15 / 5) * 10
V2 = 3 * 10
V2 = 30 L
Thus, the volume of helium in the weather balloon at 15 °C is 30 L
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Imagine that a researcher has developed a way to isolate thylakoids from chloroplasts and to make the ph of the thylakoid space acidic. If these isolated thylakoids are transferred to a ph8 solution in the dark, what might the researcher expect to observe?.
These isolated thylakoids are transferred to a ph8 solution in the dark, that the isolated thylakoids produce ATP.
Isolated thylakoidsThe chloroplasts are exposed to a hypotonic buffer devoid of sorbitol in order to achieve this. While stromal extract (SE) must also be isolated during this preparation if the cpSec1 or cpSRP pathways are to be studied, isolated thylakoids can be used to test any of the translocation pathways.
Can isolated thylakoids produce ATP?In the experiment that follows, it is possible to make thylakoid membranes that were isolated from chloroplasts produce ATP without the assistance of photosynthetic electron transport. Thylakoids are taken out of chloroplasts and suspended in a pH 4 buffer.
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the pressure inside a hydrogen-filled container was 2.10 atm at 21 ∘c . what would the pressure be if the container was heated to 89 ∘c ? express your answer with the appropriate units.
By utilizing ideal gas laws and the conversion of given temperatures into absolute temperatures we can calculate that the pressure of the gas at 89 °C will be 2.59 atm.
Amonton's law (one of ideal gas laws) states that at constant volume and number of moles of the ideal gas, the pressure that the gas exerts is directly proportional to the temperature of the gas. In mathematical form:
[tex]\frac{P_{1} }{T_{1} } = \frac{P_{2} }{T_{2} }[/tex]
P is the pressure of the gas while T is absolute temperature (in Kelvins). First, we convert temperature in Celsius to Kelvins:
T1 = (21 + 273) K = 294 K
T2 = (89 + 273) K = 362 K
Now, we transform the Amonton's law equation so that we can calculate the pressure at the higher temperature:
P2 = T2 * P1 / T1
Finally, we plug the known values into the transformed equation:
P2 = 362 K * 2.10 atm / 294 K = 2.59 atm
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Question 3 please
How many mL of … are required…
Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution.
What is true for a strong base?Strong and Weak Foundations Bases provide a similar problem: a strong base is one that is completely ionized in solution. A weak base is one that is less than 100% ionized in solution.
Acids and bases are incompatible. Acids and bases will balance one another out. A solution's pH can be changed by acids but not by bases. While bases give hydrogen ions (H+), acids give hydroxide ions (OH-).
The aqueous solution of the salt formed by neutralisation of weak acid and strong base possesses basic nature, while aqueous solution of salt produced by neutralisation of weak base and strong acid possesses acidic nature.
The complete question is:
A strong base or salt in solution exist predominately as electrons in solution.
a) True
b) False
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Which statement describes the relationship of resistance and current?
Resistance is directly proportional to current because R = V over I..
Resistance is inversely proportional to current because R = .
Resistance is directly proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI.
Resistance is inversely proportional to current because R = VI. Option D.
If you increase the applied voltage and don't change the resistance, the current will also increase. The higher the resistance the more strongly the electron interacts with the resistance, slowing it down. Electrons repel each other, so even if more electrons pass through the resistor this cannot be counteracted.
As resistance increases current decreases and all other factors remain constant. Materials with low resistance, such as metals, are called electrical conductors and allow current to flow easily. High-resistance materials such as plastics are called electrical insulators. Current is inversely proportional to resistance. If I fix the voltage across a variable resistor the current that flows is inversely proportional to the resistance.
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Answer:
B) Resistance is inversely proportional to current because R = V/I
Explanation:
HELP BRIANLIEST AND 30 POINTS
If the density of an object is greater than 1 g/ml, what does that mean?
Group of answer choices
The object is heavier than gold
The object will float in water
The object will either sink or float in water depending on its size
The object will sink in water
If the density of an object is greater than 1 g/mL, the object will sink in water (option D).
What is density?Density of a substance can be defined as the measure of the mass of matter in the substance contained by a unit volume.
The density of a substance is a determinant of whether or not the substance will float or sink in a liquid substance like water.
This means that an object will float in water if it has a density less than water but will sink if it has a density higher than water.
Since the density of water is 1g/mL, therefore, an object with density greater than 1g/mL will sink in water.
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Takisha conducted an experiment to determine the effect of salt on the boiling point of water. She measured the boiling points of 100 ml of water with salt added in 5 g increments. As a control, she also recorded the temperature of water with no salt added. What is the purpose of this control?.
The control provides a reference value for comparison to samples in which a variable is changed.
What effect does salt have on the experiment with water boiling point?Giddings said that the presence of salt makes it more difficult for water molecules to escape from the pot and transition into the gas phase, which occurs when water boils. Salted water has a higher boiling point as a result.What happens if you experiment with adding salt to water?When salt is added to water, the water becomes denser. Salt provides bulk to the water as it dissolves in it (more weight to the water). By making the water denser, more items that would normally sink in fresh water can float on the surface.What does salt and water come to?Since salt water heats up more quickly and reaches its boiling point first, it will boil more quickly than pure water. When pure solvent (in this case, water) and a dissolved material (salt) are combined to form a solution, boiling elevation point occurs (the salt water).To learn more about boiling point of water visit:
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Which two terms describe this type of data?
A. Qualitative
B. Continuous
C. Quantitative
cm
D. Discrete
Which items are fuel for physical activity.
Select 2 correct answer(s)
options:
A)Specialized sports drinks
B)Food Intake
C)Supplementation
D)Water Intake
Answer:
Water Intake,Food Intake
Explanation:
At a fixed temperature and pressure, the volume occupied by a gas is _____ proportional to the number of moles of gas present. For ideal gases under these conditions, equal _____ of gas contain equal numbers of particles or moles.
Answer:
that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." For a given mass of an ideal gas, the volume and amount (moles) of the gas are directly proportional if the temperature and pressure are constant.
is the following sentence true or false? every chemical or physical change in matter includes a change in energy
a rigid plastic container holds 6.38 l of methane gas at 127 torr pressure when the temperature is 26.0 degrees celsius. how much pressure will the gas exert if the temperature is raised to 43.1 degrees celsius?
A pressure of 210.5 torr will be exerted by the gas if the temperature is raised to 43.1°C.
What are pressure and temperature?Temperature as we have been learning from childhood is the degree of hotness or coldness.Pressure is the force exerted per unit area that is the force you exert on a given surface.By using the gas equation that is PV=NRT we can solve his question to know the pressure exerted when the temperature is changed.According to Charles's law P₁/T₁ = P₂/T₂
Given, P₁ is 127 torr and T₁ is 26°C and T₂ is 43.1°C.
127/ 26 = P₂/ 43.1
P₂ = (127 × 43.1) / 26
P₂ = 5473.7 / 26
P₂ = 210.5 torr
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PLS HELP, I DIDN'T KNOW THIS WAS DUE UNTIL I CHECKED-AND IM WORKING ON MY OTHER 5 HOMEWORK ASSIGNMENTS, SO I DONT HAVE TIME TO DO THIS!!! I just need the answers you don't need to go into full detail! I'LL GIVE BRAINLIEST!!!
Proton has positive charge whereas neutron has no charge.
What are the difference between a proton and neutron?Proton is a type of subatomic particle that has a positive charge whereas Neutron is a type of subatomic particle that has no charge.
An atom that has lost one or more number of electrons is known as anion.
Isotopes is defined as an element that have the same number of protons i.e. atomic number but different numbers of neutrons i.e. mass number.
Electron is located outside the nucleus of an atom.
Fluorine is that atom which has 9 number of protons so its atomic number is 9.
Atomic number is related to the number of particles in the nucleus of an atom because in the nucleus, proton is present which shows the atomic number of an atom.
There are three parts of an atom i.e. proton, electron and neutron.
The size of electron is about 2 × 10⁻¹⁰ cm, The size of proton is about 0.84×10⁻¹³ cm and the size of neutron is about 1.7×10⁻¹⁵ meters
Electron has negative charge, proton has positive charge and neutron has no charge.
Yes, we can tell about the element if we know about the charge and the number of electrons in it because different atoms has particular number of electrons.
The diameter of a nucleus in scientific notation is 1.6 x 10⁻¹⁵.
The mass of hydrogen atom in whole number is 0.00000000000000000000000000167.
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BRAINLIST AND 30 POINTS
Which of the following is NOT a physical change? [Choose all that apply.]
Group of answer choices
melting ice cream
water evaporating from a puddle
making elephant toothpaste
roasting a marshmallow
mashing potatoes
burning a piece of paper
cutting wood
Answer: Making elephant toothpaste, roasting a marshmallow, And burning a piece of paper are all examples of chemical changes.
Explanation:
A chemical change is when the atoms in something have broken old bonds and made new ones.
Making elephant toothpaste is NOT a physical change because two things are mixed together to make a chemical change and therefore it's a chemical change not a physical change.
Burning a piece of paper is not a physical change because when a paper is burned it turns into ash/dust and it changes its chemical composition. Therefore it's a chemical change, not a physical one
12. Which of these are the reactants in the photosynthesis equation?
O CO2 and water
02 and sugar
Energy and CO2
Sunlight and sugar
Answer:
The reactants of photosynthesis are carbon dioxide and water.
What is the resistance of a light bulb if a potential difference of 120 V will produce a current of 0.5 A in the bulb?
0.0042
0.5
60
240
Answer:
120/0.5
=240ohms
A chemistry student as Agora is calculating the average atomic mass of potassium using the following data.
Isotope k-39 Relative abundance 93.12% atomic mass 38.964 amu.
Isotope k-41 Relative abundance 6.88% atomic mass 40.962 amu.
The student calculated the average atomic mass to be 40.823 amu but it is 39.098 amu on the periodic table. What did the student do incorrectly?
The student made a mistake in substituting the wrong values of the relative abundance of the isotopes Potassium-39 and Potassium-41. That is why his answer was wrong.
The student exchanged the values of the relative abundance of the isotope values. That is why it has resulted in the wrong value of the average atomic mass. On substituting the correct values using the following formula, we get the atomic mass of the respective isotopes as,
atomic mass = Mass x Relative abundance
atomic mass of K⁴¹₁₉ = 40.962 x 0.0688
the atomic mass of K⁴¹₁₉ = 2.8181856amu
Similarly, for the mass of K₃₉¹⁹ = 38.964 x 0.9312
= 36.28327amu
Thus the average atomic mass of Potassium is given by,
Average atomic mass of potassium = Mass of K₃₉¹⁹ + Mass of K⁴¹₁₉
The average atomic mass of potassium = 36.2832 +2.8181
The average atomic mass of potassium = 40.962amu
Hence, the correct value of the average atomic mass is thus obtained.
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