Answer:
solids, liquids, gases
The hydrophobic effect is the primary driving force for protein folding because: Question 4 options: a) A folded protein is able to form the most hydrogen bonds b) An unfolded protein maximizes the entropy of a biological system c) A folded protein maximizes the entropy of water
Potassium’s atomic number is 19, and its atomic mass is approximately 39. How many neutrons does potassium have?(1 point)
39
58
20
19
Answer:
20 neutrons
Explanation:
13. Find the total number of atoms present in the following molecules. a. 5 H₂O b. Zn Cl₂
Answer:
A= 15 atoms B= 3
Explanation:
5 x 2 + 5 x 1
3 + 2 x 1
An unknown element is a mixture of isotopes ¹²⁹X and ¹³²X. The average atomic mass of X is 131.01 amu. What is the percent abundance of ¹³²X?
Answer: 67%
Explanation: The weighted averages of the two isotopes must add to 131.01. Let Y be the percentage of isotope 129. Then (1-Y) will be the percentage of isotope 132. The weighted average of each is:
129: 129Y
132: 132(1-Y)
Their sum is equal to 131.01
129Y + 132(1-Y) = 131.01
Y = 0.33, or 33%
(1-Y) = 0.67, or 67%
Check: 129*(0.33) = 42.57
132*(0.67) = 88.44
Sum = 131.01 It checks OK The 132 isotopes is 67% of the sample.
Considering the definition of atomic mass, isotopes and atomic mass of an element, the percent abundance of ¹³²X is 67%.
Definition of atomic massFirst of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Definition of atomic massOn the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes. In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Percent abundance of ¹³²XIn this case, you know:
An isotope has an atomic mass of 132 amu and a percent natural abundance of y.An isotope has an atomic mass of 129 amu and a percent natural abundance of 1-y. The average atomic mass of X is 131.01 amuThen, the average mass of X can be calculated as:
132 amu×y + 129 amu×( 1-y)= 131.01 amu
Solving, you can find the percent abundance of ¹³²X:
132 amu×y + 129 amu×1 - 129 amu×y= 131.01 amu
132 amu×y + 129 amu - 129 amu×y= 131.01 amu
132 amu×y - 129 amu×y= 131.01 amu - 129 amu
3 amu×y= 2.01 amu
y= 2.01 amu÷ 3 amu
y= 0.67= 67%
Finally, the percent abundance of ¹³²X is 67%.
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If the density of carbon tetrachloride is 0.893 g/mL, and a sample has a volume of 9.29 mL, what is the mass?
Answer:
8.3g
Explanation:
d=m/v
m=d*v
m=0.893*9.29
m=8.3g
If the density of carbon tetrachloride is 0.893 g/mL. The mass of the compound will be 8.3 g.
What is mass?Mass is the quantity of matter. The mass can be calculated by multiplying density with the volume. The evaluation of how close something is packed. As the mass per unit volume, it has that definition.
Volume is the space occupied by the object. The liquid that weighs heavier is denser if you weigh two liquids with similar volumes or amounts. A substance that is less dense than water will float if it is gently introduced to the water's surface.
So the formula will be d = m / v
m = d x v
The density of carbon tetrachloride is 0.893 g/m
The volume of carbon tetrachloride is 9.29 mL
What the mass is?
Putting the value in the formula
m = 0.893 x 9.29 = 8.3g
Thus, the mass of the compound will be 8.3 g.
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PLS HELP ME !!!!!!!!!!
Answer
the answer is it will bubble and foam.
Explanation:
when mixed with vinegar, baking soda will foam almost like a shaken carbonated drink.
Hope that helps!!!
If a tube is 2.2 meters in length, how long is the the tube in feet ?
Answer:
7.22 feet long
Explanation:
1 meter = 3.28084 feet
2.2 × 3.28084 = 7.21785
= 7.22
I hope this is helpful :)
what is RbCIO2 name?
Answer:
RbCIO2 rubidium chlorite magnesium hypocarbonite.
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, RbCIO[tex]_2[/tex] is named as rubidium chlorite magnesium hypo carbonite.
What is chemical Compound?Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. The name of the given compound is rubidium chlorite magnesium hypo carbonite.
Therefore, RbCIO[tex]_2[/tex] is named as rubidium chlorite magnesium hypo carbonite.
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what are the principal functions of a laboratory store
The main duties of a laboratory shop are to offer a secure setting for the distribution and storage of materials, tools, and supplies used in laboratories.
What is the fundamental idea on research facility ?Any laboratory or research facility must have this to run efficiently. A laboratory store's primary duty is to safely and securely store materials, equipment, and supplies used in laboratories.
Making sure the objects are stored in a way that keeps them from becoming harmed or contaminated is part of this. This also entails making certain that the goods are arranged such that they may be quickly found and retrieved when required.
In addition, the laboratory store should have a system in place to track the inventory and ensure that the items are always in stock. A laboratory store's second purpose is to act as a distribution system for materials, tools, and supplies used in labs.
This involves making sure the supplies are sent to the right people in a timely way and that they are kept in the suitable places for storage. Additionally, the staff should be able to receive support and guidance from the laboratory shop on how to use and care for the equipment.
The storage and distribution of laboratory supplies, tools, and materials takes place in a safe atmosphere, which is the laboratory store's third purpose. This involves making sure the assets are kept in a secure place and that only authorised people are allowed access to them.
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How many grams of tin would occupy 5.5 cm^3, if it had a density of 7.265 g/cm^3
Answer:
Density=Mass/Volume
7.265=M/5.5
Mass=7.265×5.5g
=39.9575g
10 cm3 of metallic cylinder has a mass of 39.35 g. The density of this cylinder is
Group of answer choices
3.935 g/cm3
39.35 g/cm3
10 g/cm3
5.935 g/cm3
Answer:3.935g/cm3
Explanation:39.35 g. /10cm3 = 3.935g/cm3
10 cm³ of metallic cylinder has a mass of 39.35 g. The density of this cylinder is 3.935 g/cm³.
Density is a measure of the amount of mass per unit volume of a substance. It is an intensive physical property, meaning that its value does not change depending on the size of the object.
Density is calculated by dividing an object’s mass by its volume.
The density of water is 1,000 kg/m³ at 4°C. The unit of density is kg/m³ (kilogram per cubic meter). The SI unit of density is kg/m³
Density = mass/volume
= 39.35 g/10 cm³
=3.935 g/cm³.
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Please help ASAP!!!!!!!!
Answer:
the correct answer is option B batteries use chemicals to store energy
We have that the statement that remains true about batteries is
"Batteries use chemical to store energy "
Option B
-All battery are able to be recharged that is not correct as some batteries are non rechargeable
-A battery is a device composed of petrochemical cells, that rel sole upon the energy from chemical reactions to give off charge
-A battery is a device that is use to store energy. Therefore Batteries to not conserve energy
Hence the statement that remains true about batteries is
"Batteries use chemical to store energy "
Option B
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Someone please answer this ty <3
Answer: Sound
Explanation:
For Carbon - 14, the top number will be ____. The bottom number will be ____.
Giving Brainlyest
How are the small intestines and large intestines similar?
They are located above the stomach and help distribute food throughout the body.
They are located in the abdomen and release bile that further breaks down the food.
They are tube-like structures that absorb nutrients or water from digested food into the bloodstream.
They look like big sponges that absorb oxygen and release carbon dioxide out of the body.
FLVS
Answer:
They are tube like structures that absorb nutrients or water from digested food into the bloodstream.
Hi i'm butt your
hahahahahahahahahahahahaha
b. The student leaves the beach because a hurricane warning comes in. In a
hurricane, water is warmed by the Sun. The air above the ocean is warmed by the
water and rises, causing cooler air masses to sink, resulting in wind. Describe how
heat transfer is involved in hurricanes. (3 points)
Hehe someone help I have put down heat but I think there is another
Answer:
chemical potential enery
Mark brainliest
matter can be classified as a ____ or a ____
Answer:
matter can be classified as a substance or a element
what is Planck's constant ??
Planck's constant =
6.62607004 × 10-34 m2 kg / s
Explanation:
Step by Step explanation
The Planck constant, or Planck's constant, is a fundamental physical constant denoted h, and is of fundamental importance in quantum mechanics. A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency. Wikipedia
Answer:
The Planck constant, or Planck's constant, is a fundamental physical constant denoted h, and is of fundamental importance in quantum mechanics. A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency.
Plancks constant =
6.62607004 × 10-34 m2 kg / s
pls mark me as brainliestWhat determines the type of decay a radioisotope will undergo
The type of decay a radioisotope will undergo is determined by: the neutron to proton ratio.
An atom can be defined as the smallest unit which comprises the matter that forms all chemical elements. Thus, atoms are typically the fundamental building blocks of matter and as such determines (defines) the structure of a chemical element.
Generally, atoms are typically made up of three (3) distinct particles and these are;
Protons. Neutrons. Electrons.Isotopes can be defined as the atom of a chemical element that has the same number of protons but different number of neutrons.
This ultimately implies that, the isotopes of a chemical element have the same atomic number (number of protons) but different atomic mass (number of nucleons).
On a related note, this two distinct particles (protons and neutrons) found in the atom of a chemical element determines the type of decay or disintegration a radioisotope will undergo.
In conclusion, the type of decay a radioisotope will undergo is determined by the neutron to proton ratio.
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Answer: the proton : neutron ratio
Explanation:
stability
2 Several scientists have adapted our model of the atom. These scientists include Democritus, Dalton, Thompson, Rutherford, Bohr, and several others. Describe why the model of the atom changed and what additional evidence would require the model to change again.
Answer:
he model of the atom changed and what additional evidence would require the model to change again.
because ;
Explanation:
This atomic model has changed over time. Scientists used the model to make predictions. Sometimes the results of their experiments were a surprise and they did not fit with the existing model. Scientists changed the model so that it could explain the new evidence.
Atomic model keep changing because the electrons around the nucleus are not fixed and they keeps rotating or changing their position in valence orbits around the nucleus. In one moment they are present on one side of the nucleus and at very next moment they will be on the other side due to their continuous rotation.
the aim of an experiment is to
A. massage the data
B.test a hypothesis
C. declare the unknown
Answer:
1) test a hypothesis this is the main aim of experiment
The following picture would be best described us
Answer:
I think its B because yeah lol but I hope you get it right
The following can be best described as a gaseous compound. The correct option is C.
What are states of matter?A state of matter is one of the various forms that matter can take in physics. In everyday life, four states of matter are visible: solid, liquid, gas, and plasma.
The elements those are gases basically at standard temperature as well as pressure are referred to as gaseous elements. The periodic table contains 11 gaseous elements.
A gas is a sample of matter that conforms to the shape of the container in which it is held and acquires a uniform density inside the container, even when gravity is present and regardless of the amount of substance in the container.
The given image depicts that the molecules of particles are at some distance from each other, this usually implies for gaseous compound.
Thus, the correct option is C.
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difference between orbit and orbital
Answer:
An orbit is a fixed path on which electrons revolve around the nucleus.
An orbital is the probable area of finding the maximum density of electrons in an atom. ..
Which is a component of John Dalton’s atomic theory?
The ratio of atoms in a compound can vary.
The atoms of a single element differ.
An atom is a small particle that cannot be broken down.
Atoms of different elements can be identical.
Answer:
should be D
Explanation:
PLZ HELP ME
What is the mass number of fluorine (F) with ten neutrons? Such an atom has a mass of 18.998 amu
What is its mass in grams?
Explanation:
mass of Fluorine = 10proton + 10 neutron
mass = 20
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The MSDS for sodium hydroxide gives it a health rating of 3, a flammability rating of 0, and a reactivity rating of 1.
According to the MSDS, which best describes sodium hydroxide?
highly corrosive but not highly flammable
highly reactive and corrosive
highly flammable but not highly corrosive
not highly reactive or corrosive
Answer:
highly corrosive but not highly flammable
Explanation:
When a chemical has a high, or even a 1, in the health rating, it usually means that the chemical is corrosive or can damage a human in another way.
Answer: highly corrosive but not highly flammable
Explanation: When a chemical has a high, or even a 1, in the health rating, it usually means that the chemical is corrosive or can damage a human in another way.
What information in a balanced chemical equation shows how many moles of a reactant are involved in the reaction?
Answer: Coefficients
Explanation: The coefficients in a balanced chemical equation tell you how many moles of reactants you'll require and how many moles of product you'll be able to make.
Answer: The coefficient in front of the molecule tells it’s relative number of moles.
Explanation: Quiz
What will happen to the atoms and molecules of a substance when it undergoes a
chemical reaction?
Answer:They change
Explanation:
Be more specific the next time you ask a question :)
Need it in 2 minutes ASAP
Answer: read your book
Explanation: if you read it should be in there
