As mentioned in its properties, one of the properties of synthetic fibres is that it will stick to the body if in contact with fire, or high temperatures. Hence, as the answer follows, rayon, being a synthetic fibre, will stick to the body.
What is base in chemistry
Hello!
In chemistry, compounds can have one of two properties. Acidic and Basic.
To determine whether a compound/solution/test subject is basic or acidic, you need to look for the pH level. pH is a unit scale for your understanding.
1-6 on the pH scale means an item is acidic.
7 on the pH scale tends to be what we consider even ground as it matches the closest to the human bodies pH level.
Anything greater than 7 is considered basic.
Examples of basic solutions and compounds are many bleaches, milk of magnesia, ammonia, even limewater!
I hope this gives you an answer to your question.
In chemistry, a base is a substance that can either release hydroxyl ions (OH⁻) in solution or accept hydrogen ions (H⁺).
A base in chemistry can be defined from several perspectives. According to the Bronsted-Lowry theory, a base is a substance that can accept hydrogen ions (H⁺), which is equivalent to being a proton acceptor. Alternatively, the Lewis theory defines a base as an electron pair donor.
Common characteristics of bases are that they are slippery to the touch, have a bitter taste, and can change the color of indicators (such as turning red litmus paper blue). They also react with acids to form salts and water, and promote certain chemical reactions (base catalysis).
One of the most straightforward ways to identify a base is by its ability to release hydroxyl ions (OH⁻) in solution. These hydroxyl ions can then combine with hydrogen ions (H⁺) in the solution, leading to the formation of water (H₂O).
The volume of an irregular object can be measured by
A scientist conducts an experiment to determine how the CO2 levels in ocean water affect the number of plants that can grow in the ocean. What is the dependent variable?
CO2 level Number of plants Plant height Types of plantsThe dependent variable is 'Number of plants' which is the correct answer.
The independent variable is CO₂ levels in ocean water, however, the growth of plants in ocean water depends on the CO₂ levels. Higher CO₂ is level is conducive to the growth of plants.
Plants use CO₂ and water in photosynthesis to prepare food in the presence of light.
6CO₂ + 6H₂O + light energy = C₆H1₁₂O₆ + 6O₂.
Answer:Number of plants.
Explanation:
When any experiment is conducted then there are two variables in the experiment. One of the variable is independent variable that we can change according to the need of the experiment.
Then the result of the experiment is known as dependent variable which depends on the independent variable.
Here, the concentration of carbon dioxide can be changed and is known as independent variable but the number of plants that will grow in the given carbon dioxide concentrations is dependent variable.
what properties do elements found in groups 1B–8B on the periodic table display?
Final answer:
Transition metals in groups 1B-8B on the periodic table display similar properties such as high melting and boiling points, good electrical and heat conductivity, and the ability to form colored compounds.
Explanation:
The elements in groups 1B-8B on the periodic table, also known as transition metals, display similar properties. These elements have partially filled d orbitals in their electron configurations, which give them their unique characteristics. Some common properties of transition metals include high melting and boiling points, good conductors of electricity and heat, ability to form colored compounds, and variable oxidation states.
Therefore, the required properties are high melting and boiling points, good electrical and heat conductivity, and the ability to form colored compounds.
What do the group 1 elements form when they react with oxygen?
Group 1 elements react with oxygen to form metal oxides. These oxides are highly reactive and upon contact with water, form alkaline hydroxides and release hydrogen gas.
Group 1 elements react with oxygen to produce metal oxides, which then react with water to form hydroxides.
Group 1 elements, also known as alkali metals, include elements like lithium (Li), sodium (Na), and potassium (K). These elements have a single electron in their outermost shell, making them highly reactive, especially with oxygen. When Group 1 elements react with oxygen, they form metal oxides that are typically white solids. The reaction of these oxides with water results in the formation of alkaline hydroxides, releasing hydrogen gas in the process. For instance, when lithium reacts with water, it forms lithium hydroxide and hydrogen gas. However, it's important to note that simply burning these metals in air will also produce mixtures of oxides and nitrides due to their high reactivity.
The reaction of Group 1 elements with oxygen is a fundamental chemical process that results in the formation of basic metal oxides, which further react with water to create hydroxides, useful in various chemical applications.
Which of the following objects would float when placed in water? (Note: 1 mL 1 cm+3)*
apple: density-0.7 g/m
gold: density 19.3 g/mL
iron: density-7.8 g/mL
rubber: density-1.2 g/mL
Only an apple will float when placed in water.
An object will float in water if its density is less than that of water (1.0 g/mL).
An object will sink in water if its density is greater than that of water.
Thus, solid objects made of gold, iron, or rubber will all sink in water.
I DON'T UNDERSTAND... HIGH SCHOOL CHEMISTRY HELP???!?!! What happens to the half-life and mass of reactants broken down during a nuclear decay reaction?
A The half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases.
B The half-life of reactants in a nuclear decay reaction decreases over time, but the mass of the reactants that are consumed stays the same.
C The half-life of the reactants in a nuclear decay reaction remains constant over time, and the mass of the reactants that are consumed stays the same.
D The half-life of reactants in a nuclear decay reaction increases over time, and the mass of the reactants that are consumed increases.
Answer is: A The half-life of reactants in a nuclear decay reaction remains constant over time, but the mass of reactants that are consumed decreases.
1) For example, the half-life for the radioactive decay of U-238 is 4.5 billion years and is independent of initial concentration.
2) Another example, half-life is the time required for a quantity to reduce to half its initial value.
Initial mass of sample: 30 grams.
After first half-life (60 days): 50% · 30 g ÷ 100% = 15 g.
After second half-life (120 days): 0.5 · 15 g = 7.5 g.
Which of the following will produce a precipitate?
a) Rh3+(aq) + K3PO4(aq)
b) Nb3+(aq) + Li2CO3 (aq)
c) Co2+(aq) + Zn(NO3)2 (aq)
d) K1+(aq) + Na2S (aq)
Answer: The correct answer is Option d.
Explanation:
Precipitation reaction is defined as the reaction in which an insoluble salt is formed when two solutions are mixed containing soluble substances. The insoluble salt settles down at the bottom of the reaction mixture.
For the given options:
Option a: [tex]Rh^{3+}(aq.)+K_3PO_4(aq)[/tex]The chemical equation follows:
[tex]Rh^{3+}(aq.)+K_3PO_4(aq.)\rightarrow RhPO_4(aq.)+3K^+(aq.)[/tex]
As, no solid product is getting formed, it will not form any precipitate.
Option b: [tex]Nb^{3+}(aq.)+Li_2CO_3(aq)[/tex]The chemical equation follows:
[tex]2Nb^{3+}(aq.)+3Li_2CO_3(aq.)\rightarrow Nb_2(CO_3)_3(aq.)+6Li^+(aq.)[/tex]
As, no solid product is getting formed, it will not form any precipitate.
Option c: [tex]Co^{2+}(aq.)+Zn(NO_3)_2(aq)[/tex]The chemical equation follows:
[tex]Co^{2+}(aq.)+Zn(NO_3)_2(aq.)\rightarrow Co(NO_3)_2(aq.)+Zn^{2+}(aq.)[/tex]
As, no solid product is getting formed, it will not form any precipitate.
Option d: [tex]K^{+}(aq.)+Na_2S(aq)[/tex]The chemical equation follows:
[tex]2K^{+}(aq.)+Na_2S(aq.)\rightarrow K_2S(s)+2Na^+(aq.)[/tex]
As, potassium sulfide is getting formed as a solid. It is considered as a precipitate.
Hence, the correct answer is Option d.
Why do some types of batteries stay fresh longer if they are kept in a refrigerator? A. Cooling increases the surface area inside the batteries.
B. Cooling increases the concentration of the reactants in the batteries.
C. Cooling lowers the rate of the chemical reaction in the batteries.
D. Cooling is similar to adding a catalyst to the batteries.
Answer:
Cooling lowers the rate of the chemical reaction in the batteries.
Explanation:
When a battery is not in use and it may undergo some chemical changes which leads to decrease in its life (shelf life).
For example in case of Zinc battery, the zinc undergoes reaction with ammonia which deteriorate the cell or battery.
Now if we keep the battery in a cool place like refrigerator, the rate of chemical reaction will decrease (the rate of reaction generally decreases with decrease in temperature). Thus the battery stay fresh longer.
A common function of proteins and carbohydrates in the plasma membrane is...
A. Synthesis of enzymes
B. Cell recognition and interaction
C. Transcription of DNA
D. Regulation of the cell cycle
A common function of proteins and carbohydrates in the plasma membrane is cell recognition and interaction.
What are carbohydrates?A carbohydrate is defined as a bio-molecule which consists of carbon,hydrogen and oxygen atoms which are usually in the ratio of 2:1 with the empirical formula C[tex]_n[/tex](H₂O)[tex]_n[/tex].
This term is most commonly used in biochemistry as a synonym of saccharide which is a group of sugars, starch and cellulose.
They perform various functions in living organisms. They serve as an energy source and as well as structural components . They are a key component in providing nutrition and are found in wide variety of natural as well as processed foods.
Carbohydrates occur as cellulose in the cell walls of plants and is one of the components of insoluble dietary fibers.
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Is the volume of water measured using the graduated cylinder identical to the volume calculated. Why ?
The volume of water measured using the graduated cylinder is not exactly identical identical to the volume calculated.
Explanation:Calculated volume is theoretical value calculated from the density and mass of water.
But volume measured in cylinder can contain the personal error of individual.
Because in graduated cylinder volume is measured in a specific way that is:
Place the graduated cylinder on a flat surface and view the height of the liquid in the cylinder with your eyes directly level with the liquid. The liquid will tend to curve downward. This curve is called the meniscus. Always read the measurement at the bottom of the meniscus.If someone told you they had a career in either ecology, paleontology, or botany, what area of science is this? Question 2 options: astronomy biology physics chemistry
Final answer:
Ecology, paleontology, and botany are all branches of biology, which is the area of science they pertain to.
Explanation:
If someone told you they had a career in either ecology, paleontology, or botany, they would be working in the area of biology. These are all branches of biological science that deal with different aspects of living organisms and their environments. Ecology involves the study of how organisms interact with each other and their environment, paleontology uses fossils to understand the history of life on Earth, and botany focuses on the study of plants. Biology, as a natural science, encompasses a variety of fields that all aim to understand the various facets of life and living organisms.
A wave travels 12 m east in 3.0 s. What is the velocity of the wave?
Answer: + 4 m/s
Working Out:
V = Δ x ÷ Δ t ;where V = velocity, Δ x = displacement, Δ t = change in time
V = Δ x ÷ Δ t
V = (12 m east) ÷ 3.0 s
V = 4 m/s to the east OR V = + 4 m/s
∴ The velocity of the wave is + 4 m/s
Answer:
4 m/s
Explanation: TOOK THE TEST
How do I balance Na + H2O = NaOH + H2
You have to combine each element on each side together.
You would do
1-Na-1 because there is 1 Na on each side
2-H-3 because there is 2 H on one side and 3 H on the other side
1-O-1 because 1 O on one side and 1 O on the other
Your final answer would be 2Na+2H2O-->2NaOH+H2
Hope I could help! :)
Although some substances we encounter in our routine lives are elements, most occur in the combined state
which is known as molecules/compounds.
A 4.700 L sample of gas is cooled from 71.0 °C to a temperature at which its volume is 3.300 L. What is this new temperature? Assume no change in pressure of the gas.
initial condition : Vi = 4.700 L , Ti = 71.0ºC +273 => 344 K
final condition : Vf = 3.300 L , Tf = ?
Pressure is constant:
According to charle's law , volume is directly proportional to temperature at constant pressure !
Hence Vi / Ti = Vf / Tf
4.700 L / 344 K = 3.300 L / Tf
Tf = 3.300 L * 344 K / 4.700 L
Tf = 1135200 / 4.700
Tf = 241.53 K
Tf = 241.53 - 273
Tf = -31.47ºC
Imagine that Kevin can instantly transport himself between Planet X and Planet Y. Which statement could be said about Kevin in this situation? Kevin’s weight may change between Planet X and Planet Y. Kevin’s volume may change between Planet X and Planet Y. Kevin’s mass may change between Planet X and Planet Y. Kevin’s matter may change between Planet X and Planet Y.
Answer:
Kevin’s weight may change between Planet X and Planet Y.
Explanation:
Mass is the amount of matter contained in an object. Gravity is Earth’s pull of a body towards its centre.
Weight (W) is product of the mass (m) of the object and the force of gravity (g) acting on the object.
W = mg
The force of gravity may change between Plant X and Planet Y, and thus Kevin’s weight may change between Planet X and Planet Y.
Answer:
Kevin’s weight may change between Planet X and Planet Y.
Explanation:
yes jaja
What are some natural processes that represent physical and chemical changes?
this is in science, but it made me choose chemistry
A "natural" chemical change would be burning wood, cooking eggs, baking a cake and milk going sour. These changes can't be changed so therefore they are chemical changes.
A natural physical change would be mixing salt or sand with water, melting or boiling water, cutting wood, and shredding paper. The salt and sand can be removed from the water. Hot and cold water are still water. Wood and paper didn't change their composition. All of these examples are reversible.
Answer:
Chemical change:
Rusting of a metal ironFood contaminationSeed germinationPhysical change:
Melting of iceBoiling of waterRock weatheringExplanation:
The difference chemical and physical change is physical change is the change of form, such as change in shape, and chemical change is the change of chemical bonds.
Only answer number 8-9
Column A
1.
isotope:
isotope
2.
neutron:
neutron
3.
drudgery:
drudgery
4.
mass number:
mass number
5.
perceive:
perceive
6.
atomic mass:
atomic mass
7.
implore:
implore
8.
badger:
badger
9.
proton:
proton
10.
atomic mass unit:
atomic mass unit
11.
atomic number:
atomic number
12.
interminable:
interminable
Column B
a.The electrical attraction between a __________ and an electron is forty powers of ten stronger than their gravitational attraction.
b.Lithium, with an __________ of 6.94, is the lightest of all the metals and is therefore an obvious candidate for battery use.
c.Protons and neutrons have masses of approximately 1 __________ each.
d.Other species can __________ colors of the spectrum that are invisible to us.
e.Technological advances have taken much of the __________ out of the assembly line and car plant.
f.Nitrogen has 7 protons and 7 neutrons in its nucleus, giving it a __________ of 14
g.Secondly, we need a leader of charisma to __________ and provoke his colleagues into action.
h.The system thus avoids the seemingly __________ delays that bedevil on-line services when they are used to transmit graphics.
i.The nucleus of a deuterium atom contains a proton and a __________.
j.Newspapers and television __________ us to slit all the candy open to ensure that it contains no foreign body.
k.But barium has an __________ of 56, barely more than half that of uranium.
l.The third __________ of hydrogen, hydrogen-3 or tritium, is highly radioactive and has a very short half-life.
a) Answer is: The electrical attraction between a proton and an electron is forty powers of ten stronger than their gravitational attraction.
Proton is a subatomic particle with a positive electric charge of +1e elementary charge.
The electron (symbol: e⁻) is a subatomic particle whose electric charge is negative one elementary charge.
Opposite charges (positive and negative) attract one another.
b) Answer is: Lithium, with an atomic mass of 6.94, is the lightest of all the metals and is therefore an obvious candidate for battery use.
The atomic mass is the average mass of element.
The average atomic mass of krypton =
= ω(⁸²Kr) · Ar(⁸²Kr) + ω(⁸³Kr)·Ar(⁸³Kr) + ω(⁸⁴Kr) · Ar(⁸⁴Kr) + ω(⁸⁵Kr)· Ar(⁸⁵Kr).
ω(Kr) is average abundance of isotopes of krypton.
Ar(Kr) is atomic mass of krypton isotope.
Another examples, atomic mass of phosphorus (P) is 30.97 and atomic mass of oxygen (O) is 15.99.
c) Answer is: Protons and neutrons have masses of approximately 1 atomic mass unit each.
The unified atomic mass unit (amu) is a standard unit of atom mass.
One unified atomic mass unit is approximately the mass of one nucleon (protons or neutrons).
The unified atomic mass unit is equal 1.66·10⁻²⁷ kg.
d) Answer is: Other species can see colors of the spectrum that are invisible to us.
For example, a common butterfly has five times more photoreceptors in their eyes than human.
So butterfly can see ultraviolet and violet spectar of colors (human can not see violet and ultraviolet), they see different wavelength than human.
e) Answer is: Technological advances have taken much of the drudgery out of the assembly line and car plant.
Drudgery is hard monotonous routine work.
At assembly lines and car plant at the beggining of the 20th century, hard work were doing humans, now with technology advances, that work is than by the machines or robots.
f) Answer is: Nitrogen has 7 protons and 7 neutrons in the nucleus, giving it a mass number of 14.
The mass number (A) is sum of the number of protons and the number of neutrons in atom.
n°(N) = 7; number of neutrons in nitrogen atom.
p⁺(N) = 7; number of protons in nitrogen atom.
A = n° + p⁺.
A(N) = 7 + 7.
A(N) = 14; nitrogen mass number is 14.
h) Answer is: The system thus avoids the seemingly interminable delays that bedevil on-line services when they are used to transmit graphics.
Interminable means something continuing for too long and because of that is boring or annoying.
i) Answer is: The nucleus of a deuterium atom contains a proton and a neutron.
Deuterium (₁²H or D) is an isotope of the hydrogen (H).
Deuterium has atomic number 1 (it has one proton) and mass number 2.
p⁺(D) = 1; number of protons in deuterium.
A = n° + p⁺.
A(D) = 2; mass number of deuterium.
n°(D) = 2 -1.
n°(D) = 1; number of neutrons in deuterium.
Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons).
j) Answer is: Newspapers and television perceive us to slit all the candy open to ensure that it contains no foreign body.
Newspapers and television make us to belief in or about something.
k) Answer is: But barium has an atomic number of 56, barely more than half that of uranium.
Atomic number (Z) is the number of protons (number of protons in neutral atom is the same as number of an electrons), which is characteristic of a chemical element,
Atomic number is unique and defines an element.
Atomic number of uranium (U) is 92 (Z = 92).
l) Answer is: The third isotope of hydrogen, hydrogen-3 or tritium, is highly radioactive and has a very short half-life.
Tritium (₁³H or T) is an isotope of the hydrogen (H).
Tritium has atomic number(Z) 1 and mass number(A) 3.
p⁺(T) = 1; number of protons in the tritium.
A = n° + p⁺.
A(T) = 3; mass number of the tritium.
n°(T) = 3 -1.
n°(T) = 2; number of neutrons in tritium.
Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons), hydrogen, besides deuterium and tritium, has isotope protium.
The range of all forms of radiant energy is given the name ?
The range of all forms of radiant energy is called the electromagnetic spectrum. It ranges from extremely long radio waves to extremely short gamma rays.
Transition metals in the fourth period fill the __________ orbital. A) 3d B) 3p C) 4s D) 4f
I am pretty sure the answer is C, but I am not certain.
The correct answer is A.) 3d
Which compound had the highest melting point
usually its rubber please give me the brainliest!
It is yet unknown compound having highest melting point of all compounds.
It is made up of right amounts of hafnium, nitrogen, and carbon would have a melting point of more than 4400 K (7460°F).
That's about two-thirds the temperature at the surface of the sun and 200 K higher than the highest melting point ever recorded experimentally.
sodium has an atomic number of 38 and a mass number of 88 how many neutrons are in one atom of strontium
88
50
38
126
Neutrons and protons each weight approximately 1 unit, while electrons weigh almost nil.
The atomic number tells us the number of protons (and electrons) there are in each atom.
Thus the mass number (88) is the total of the number of neutrons (N) and protons (38).
Therefore the number of neutrons is N=(88-38)=50
how many atoms are in 80.2 grams of Calcium?
Answer:
There are [tex]1.207\times 10^{24} atoms[/tex] in 80.2 grams of calcium.
Explanation:
Atomic mass of calcium = 40 g/mol
Mass of calcium given = 80.2 g
Moles of calcium = [tex]\frac{80.2 g}{40 g/mol}=2.005 mol[/tex]
1 mol = [tex]N_A=6.022\times 10^{23} [/tex] atoms/ molecules, ions
Number of atoms of calcium in 2.005 moles of calcium:
[tex]2.005 \times 6.022\times 10^{23}=1.207\times 10^{24} atoms[/tex]
There are [tex]1.207\times 10^{24} atoms[/tex] in 80.2 grams of calcium.
The number of atoms in 80.2grams of calcium is 1.207 × 10²⁴ atoms.
How to calculate number of atoms?The number of atoms of an element can be calculated by multiplying the number of moles of the substance by Avogadro's number as follows:
no of atoms = no of moles × Avogadro's number
According to this question, 80.2grams of calcium are given. Calcium has a molar mass of 40.0g/mol. The number of moles can be calculated as follows:
no of moles = 80.2g ÷ 40g/mol = 2.005mol
No of atoms = 2.005mol × 6.02 × 10²³
no of atoms = 1.207 × 10²⁴ atoms
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The number of grams in the molar mass of an element is the same as an elements ...
It is the same as an elements number of protons.
Iron, Fe, is a solid at room temperature. Iron is a shiny, bright white metal that is soft, malleable, ductile and strong. Its surface is usually discolored by corrosion, since it combines readily with the oxygen of the air in the presence of moisture. The density of iron is 7.86 g/cc. Iron is a good conductor of electricity and heat. Consider the paragraph above. What is one chemical property of iron? A) Iron is malleable. B) The density of iron is 7.86 g/cc. C) Iron combines readily with oxygen. D) Iron is a good conductor of electricity and heat.
The correct answer is option C. Iron combines readily with oxygen is the chemical property of iron.
The chemical property of iron is revealed when it reacts with oxygen of the air in the presence of moisture in a chemical reaction to form iron oxide or rust.
Rust corrodes and discolors the shiny, bright white iron metal.
Answer:
C) Iron combines readily with oxygen.
Explanation:
A physical property can be measured and observed without changing the composition or identity of the substance; while a chemical property is observed when a chemical change is given, such as a reaction.
So, the only statement that implies a chemical change is the rapid combination of iron with oxygen, forming an oxide which is a new substance.
Explain the 4 blocks of the periodic table. How many, what are they, and what is strange about block "d"?
Answer and explanation;
An element block is a set of elements located in adjacent element groups.
There are four blocks; s, p, d, f; which originated from descriptions of spectroscopic lines of atomic orbitals: sharp, principal, diffuse and fundamental.
s-block; the first two groups of the periodic table, the s-block metals:
are either alkali metals or alkaline earth metals are soft and have low melting points are electropositive and chemically activeP-block elements include the last six element groups of the periodic table, excluding helium. The p-block elements include all of the nonmetals except for hydrogen and helium, the semi-metals, and the post-transition metals.
D-block elements are transition metals of element groups 3-12. D-Block elements:
have valence electrons in their two outermost and shells 'd' block elements behave in a manner that is somewhere between that of highly reactive electropositive alkali metals and the covalent compound forming elements.have high melting and boiling points usually form colored salts are generally good catalystsf-block; Inner transition elements, usually the lanthanide and actinide series, including lanthanum and actinium. These elements are metals which have:
high melting points variable oxidations states the ability to form colored saltsUniqueness of group D elements; Normally across the period atomic radii should decrease. But d-block elements do not follow this trend. It increases From V to Cr and them remains constant and decreases and remains constant again.
Name the following Ionic Compound:
Fe2O3
(I believe this is Iron (III) Oxide)
It is Iron 2 (Fe2) and Oxygen 3 (O3). Hope this helps!
The chemical formula Fe₂O₃ corresponds to the ionic compound Iron (III) Oxide.
An ionic compound is a chemical compound composed of positively charged ions (cations) and negatively charged ions (anions) that are held together by electrostatic forces.
In this compound, Fe represents iron, and the Roman numeral III indicates the charge on the iron ion, which is +3. The symbol O represents oxygen.
Iron (III) Oxide is commonly known as rust and is a reddish-brown compound that forms when iron reacts with oxygen in the presence of moisture.
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Which steps are important when designing and conducting a scientific experiment?
Hide the results from fellow scientists.
Identify the independent variable.
Eliminate all dependent variables.
Address any confounding variables.
Form a non-falsifiable hypothesis.
there more then 1 answer
Explanation:
When designing and conducting a scientific experiment then it is necessary to sequentially follows all the steps necessary for the experiment.
Also, it is required to identify independent variables, if any. On the other hand, it is required to address any confounding variables, so that it becomes mentioned the type or number of variables present.
Thus, we can conclude that when designing and conducting a scientific experiment:
Identify the independent variable.Address any confounding variables.