Answer:
A.Rn,Ne,Ar,Kr.......
How does nano frabic work
Answer:
Nano silver is woven into fabric to give it anti-bacterial properties.
Explanation:
Helps by fending off the bacteria that make those clothes smell after you sweat. Nano-titanium dioxide adds sun protection to clothing just as it does in sunscreen. The use of nanoparticles to achieve fresh-smelling clothes and UV protection may not be safe.
Help please. ASAP.
1. Explain how you think changing in the thickness or length of the nail will affect the strength of the electromagnet
Answer:
I believe- If there is more metal for the magnet to reach for, then the strength will grow but it may be harder to pick up off of a surface depending on the weight of the nail. If it is a light nail, it would be more efficient for a quick result in having the magnet to pick it up
Explanation:
Answer:
Ferromagnetic materials make the magnet stronger than non-ferromagnetic materials like paper, wood, or air. A wider nail will make the magnet stronger. Making the nail longer will not make the magnet stronger, unless you also add more turns to the coil.
Explanation:
I hope this helps!!
What is the mass of 0.0467 mol of the element sodium (Na)
Answer:
Explanation:
All periodic tables list different amounts of elemental masses. I'm going to round Sodium to 23
1 mol of sodium = 23
0.0467 mol sodium = x
Cross multiply
1*x = 0.0467 * 23
x = 1.0741 grams
Four substances are tested for different properties. The results of the tests are in the table below.
Substance
Combustible
Reactivity
Solubility in water
Solubility in ether
Boiling point (ºC)
W
Yes
Yes
Soluble
Insoluble
883
X
Yes
No
Insoluble
Insoluble
2,750
Y
Yes
No
Insoluble
Soluble
196
Z
No
Yes
Soluble
Soluble
98
Which substance is most likely an alkane?
W
X
Y
Z
Answer:
Element Y, or the third option
Explanation:
Alkanes are insoluble in water, but soluble in ether. Their boiling points are pretty low, barely reaching 200 degrees, so element Y is an alkane.
Answer:
c.
Explanation:
Question 4
Which best describes a chemical reaction that follows the law of conservation of matter?
А
The reactants have the same mass as the products.
B
The reactants have the same density as the products.
С
The products conserve all physical properties of the reactants.
D
The products conserve all chemical properties of the reactants.
Distinguishing Types of Waves through Examples
A 2-column table with 3 rows. The first column labeled mechanical waves has entries ocean water, light waves, earthquake waves. The second column labeled electromagnetic waves has entries sound waves, radiation waves, X-ray waves.
How should the table be changed to correctly distinguish between mechanical and electromagnetic waves?
Earthquake waves and radiation waves need to change places.
Light waves and X-ray waves need to change places.
Ocean waves and X-ray waves need to change places.
Sound waves and light waves need to change places.
Answer:
Sound waves and light waves need to change places.
Explanation:
Given table:
Mechanical waves Electromagnetic waves
Ocean water Sound waves
Light waves Radiation waves
Earthquake waves X-ray waves
From the given table, to be correct, light and sound waves must change their position.
Light wave is an electromagnetic wave
Sound wave is a mechanical wave
An electromagnetic wave does not require a material medium for propagation.
Mechanical waves require material medium for their propagation.
Mechanical waves Electromagnetic waves
Ocean water Light waves waves
Sound waves Radiation waves
Earthquake waves X-ray waves
Answer:
Sound waves and light waves need to change
Explanation:
When their is a new moon the sun and moon are on the same side of the earth this leads to a combination of gravitational forces causing usually high tides called
Neap tides
Low tides
Supreme tides
Spring tides
Answer:
Low Tides
Explanation:
Took the test
100%
Which formula represents a tetrahedral molecule?
LiBr
CO2
H₂
SIF4
um this is kinda weird I am take a guest SIF4
The formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4
From the question,
We are to determine which of the given formulae represents a tetrahedral molecule
In order to determine the molecule that represents a tetrahedral molecule, we will determine which of the molecules has a tetrahedral molecular geometry.
A tetrahedral molecular geometry has a central atom located at the center with four substituents that located at the corners of a tetrahedron
Among the given options, the molecule that has four substituents is SiF₄. Si is the central atom and the F atoms are the substituents.
Hence, the formula that represents a tetrahedral molecule is SiF₄. The correct option is the fourth option - SIF4
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1+1 = ?
plz say plzplapL
is xenon a metal and is Beryllium a metal
Answer:
No and yes
Explanation:
Xenon is a noble gas and beryllium is a metal
Answer: no and yes i also agree
Xenon is a noble gas and Beryllium a metal
Explanation:
heyyyyyyy......................
Answer:
helllllooooooo hi how is life
Answer:
hiiii
Explanation:
Which chemical family below would the element iodine most likely belong to?
The chemical family that the element iodine should belong to is halogen.
The following information related to the halogen is:
It is the subset that has chemical elements i.e. reactive. It is in Group 17 on the periodic table that should be existed in the environment as the compounds instead of the pure elements.The other type of halogens should consist of fluorine (F), chlorine (Cl), etc.Therefore we can conclude that the chemical family that the element iodine should belong to is halogen.
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A student would like to test the effect of eating a lot of candy on
student hyperactivity. She sets up two groups for her experiment and
measures her results in the number of times a student jumps out of their
seat. What is the independent variable?
Answer:
Number of candies
Explanation:
The independent variable in this experiment is the number of candies eaten by the student.
An independent variable is best pictured as the cause in an experiment. It is the reason why the effects in experiments are produced.
In this experiment, the hyperactivity is the hyperactivity is the dependent variable. It is the effect that is produced in this set up.
Answer:
Just to make it short, its eating a lot of candy
Explanation:
why chemical reactions are important to society?
In the burning food investigation where you are trying to find out which food contains the most energy - what is the independent variable? *
Answer:
sorry but i dont know it but you can ask me other things
A mixture contains 20% iron ions by mass. What mass of iron chloride (FeCl) would
you need to provide the iron ions in 50 g of the mixture? A of Fe = 56, A of Cl = 35.5.
.
Mass of iron chloride (FeCl₂) : 22.68 g
Further explanationProust stated the Comparative Law that compounds are formed from elements with the same Mass Comparison so that the compound has a fixed composition of elements
In the same compound, although from different sources and formed by different processes, it will still have the same composition/comparison
With this law, we can calculate how many grams an element is needed to make a compound with a certain mass, as desired
[tex]\tt mass~Fe=\dfrac{Ar~Fe}{MW~FeCl_2}\times mass~FeCl_2[/tex]
The iron ions in 50 g mixture :
[tex]\tt 20\%\times 50~g=10~g[/tex]
[tex]\tt 10=\dfrac{56}{127}\times mass~FeCl_2\\\\mass~FeCl_2=22.68~g[/tex]
pb3(po4)2 compound name
Answer:
Lead phosphate
Explanation:
Pb3(po4)2 has the compounded name of lead(II) phosphate.
What is lead(II) phosphate like ?It is a white, crystalline solid that is insoluble in water. Lead(II) phosphate is used in some paints and plastics, and it is also used as a pigment.
The name of the compound is based on the oxidation state of the lead atom. Lead can have two oxidation states, +2 and +4. In Pb3(PO4)2, the lead atom has an oxidation state of +2, so the compound is named lead(II) phosphate.
The phosphate ion has an oxidation state of -3, so there are two phosphate ions in the compound to balance the +6 charge of the three lead atoms.
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Heyy, I am a 14 year old girl
How can a mixture be separated?
Answer:
Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.
Which of the following is not likely to occur if a city loses its tax base due to economic decline? A. The city will have fewer police and fire fighters. B. City residents will have adequate health care and hospital services. C. The city will have a decline in public housing. D. Public and private buildings will decay.
Answer:
B.
City residents will have adequate health care and hospital services.
Explanation:
the correct answer for edg 2020
Answer:
B
Explanation:
How do changes in wind currents affect the short-term climate in a region?
Prevailing winds can cause a milder climate with heavy rain.
Global winds can cause a longer summer.
Prevailing winds can cause heavy rains or a dry climate.
Global winds can cause a longer winter.
Answer:
a
Explanation:
Prevailing winds can cause a milder climate with heavy rain is the change that affects the short-term climate in a region, hence option A is correct.
What is wind currents?Concentrated areas of winds are known as air currents. They primarily result from variations in the temperature or atmospheric pressure.
The horizontal and vertical currents are present at the mesoscale, whereas horizontal currents predominate at the synoptic scale.
A region's short-term climate can be dramatically impacted by changes in wind currents. As they move moisture from one place to another, prevailing winds can result in a milder climate with heavy rain.
As a result, the impacted area may see higher precipitation and a more temperate environment.
Therefore, prevailing winds can cause a milder climate with heavy rain can impact the short-term climate in a region.
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How many Joules of heat are needed to melt 3.0 g of ice?
Answer:A substance must absorb heat energy so that it can melt or boil. The temperature of the substance does not change during melting, boiling or freezing - even though energy is still being transferred
Explanation:imm not sure
The lowest allowable energy state of an atom is called its .
Help plzzzz urgent !!!!!!!!!!!!!!
Answer: B < C < A
Explanation:
Ok so things that have the lowest pka are the strongest acids. the higher the pka the less acidic it is.
A sample substance has the chemical formula:
H2CO3
One molecule of the sample contains -
Two different elements with atomic numbers 1 and 27
Two different elements with atomic numbers 1, 6, and 8
Two different elements with atomic numbers 2 and 29
Two different elements with atomic numbers 2, 8 and 20
Answer:
1,6,8
Explanation:
Periodic Table- H=1.C=6,O=8
Hydrogen is H, Carbon is C, Oxygen is O
One molecule of the sample contains three different elements with atomic numbers 1,6 and 8.
What is an element?Element is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.Each element has its own characteristic property.
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Your question is incomplete, but most probably your full question was,a sample substance has the chemical formula:
H2CO3
One molecule of the sample contains -
Two different elements with atomic numbers 1 and 27
Two different elements with atomic numbers 1, 6, and 8
Two different elements with atomic numbers 2 and 29
Two different elements with atomic numbers 2, 8 and 20
Three different elements with atomic numbers 1,6 and 8
4. Hot material in the Earth's mantle rises and cool material
sinks. This is an example of
a. conduction
b. convection
c. radiation
d. none of these
Answer:
Th answer is b. convection.
Explanation:
As the heat rises it cools down and it sinks and as the cold sinks it heats up so then it rises back up.
The first atomic structure *
Yes
NO
Answer:
Yes? Sry I’m kinda confused
Explanation:
Sry if I’m wrong
What does the chemical formula show?
a) The number of elements in each molecule
b) The number of atoms in each molecule
c) How heavy the molecule is.
d) The elements in the molecule and the number of atoms of each one .
Answer:
A
Explanation:
You can eliminate C because you need to consult a periodic table to determine the mass (not the weight).
There are other answers you could use. The wording is awfully sloppy. D is an example of that. The elements part is true, the atoms part is not really true in all cases. For example NaCl is table salt and both the elements are ions, not atoms. Na is plus ion and Cl is minus one. B is wrong for the same reason.
I think in the end I would choose A. I think this is a very sly question. It is not really testing chemistry. It is testing how well you know your definitions.
Which element would have chemical reactions most similar to fluorine (F)?
A. O
B. Br
C. Ne
D. Fm
giving brainliest if right
[tex]\mathrm {Hey, there!}[/tex]
The answer is: Bromine
Oxygen is not similar to flourine, it is not a noble gas with high ionization.
Neon does not have chemical reactions like flourine.
The answer is Bromine! Best of Luck!
Answer:
Br
Explanation:
In the cell, amino acid molecules combine to form
Answer:
A polypeptide chain!
Explanation:
Hopefully this helps! If this wasn't the answer you were looking for please don't hesitate to comment here or private message me! Have a nice day/night! :))
Amino acids are the fundamental building blocks of proteins. In the cell, amino acid molecules combine to form polypeptide chain or protein.
What are amino acid ?The term amino acids are defined as the building block of the protein. Amino acids are the fundamental building blocks of proteins. Their molecule contains both an amino and a carboxylic group.
Alpha-amino acids are amino acids that have an amino and a carboxyl group attached to the same carbon atom, i.e., an alpha-carbon atom. Glycine, Alanine, etc.
Proteins are made up of monomers called amino acids. A protein is composed of one or more linear chains of amino acids, each of which is referred to as a polypeptide.
Thus, In the cell, amino acid molecules combine to form polypeptide chain or protein.
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