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Carbon fibre is finding many uses as a very strong, yet lightweight, material. It is currently used in tennis rackets, skis, fishing rods, rockets and aeroplanes.Impure carbon in the form of charcoal (from wood) and coke (from coal) is used in metal smelting. It is particularly important in the iron and steel industries.[tex]{\huge{\underline{\small{\mathbb{\blue{HOPE\:HELPS\:UH :)}}}}}}[/tex]
3. When substances cross cell membranes by simple diffusion, they
a. squeeze between phospholipid molecules.
b. have help from channel proteins.
C. move from a higher to lower concentration.
d. two of the above
Answer:B
Explanation:due to osmosis and osmoregulation of the cell membrane
Which of these metal oxides would you be unable to reduce to pure metal using carbon?
zinc oxide
Coppes oxide
calciumoxide
iron oxide
Answer:
calcium oxide
Explanation:
its stable
There are several metals which can be used to reduce the metal oxides to corresponding metals. Carbon is an efficient reducing agent. Here Calcium oxide cannot be reduced to calcium by carbon. The correct option is C.
What is metal oxide?The reaction of metals with oxygen result in the formation of oxygen containing compounds called metal oxides. The binary compounds of oxygen with lesser electronegative elements are called oxides. Most of the stable oxides have 'O' in its -2 oxidation state. Na₂O, CO₂, etc. are some oxides.
Carbon is a reducing agent and it is present above the elements like 'Zn', 'Cu', 'Fe', 'Ag', etc. in the electrochemical series. But the oxides of highly reactive metals cannot be reduced with carbon. Because these metals have more affinity for oxygen than carbon.
The highly reactive metals are extracted by using the electrolytic reduction of their molten chloride. It is not possible for carbon to reduce the oxides of metals like 'Na', 'Ca', 'Al', etc.
Thus the correct option is C.
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True or false When heat flows to an object, it can change states.
Answer: True
Explanation:
The matter exists as solid, liquid or gas. These are called the states of matter. The change of matter from one state to another can be achieved by heating or cooling.
The solid state can be converted into liquid state by providing heat to solid. The heat will make the particles move farther, resulting into liquid state.
Similarly when liquid state is provided heat, it changes to gaseous state. The heat will make the particles move much more faster.
Thus the statement that when heat flows to an object, it can change states is True.
Carbon dioxide (CO2) is a common compound made of
A)3 elements and a total of 3 atoms
B)2 elements and a total of 2 atoms
C)3 elements and a total of 2 atoms
D)2 elements and a total of 3 atoms
Hotter objects have _______________________ particles, while cooler objects have _______________________ particles.
Hope this helps
Hotter objects have faster particles, and cooler objects have slower particles.
when is light produced during e- configuration
1. How many molecules of H,O are in 4.32 moles?
Answer:
dont know
Explanation:
PLZ HELP!
Why do we use ramps (inclined planes) to help us move objects?
Plz nothing from the internet :D
Which statement compares the attractive forces that hold particles together?
A. Polar covalent bonds and Van der Waals forces are weakly
attractive; ionic and hydrogen bonds are strongly attractive.
B. lonic and hydrogen bonds are weakly attractive; polar covalent
bonds and Van der Waals forces are strongly attractive.
C. lonic and polar covalent bonds are weakly attractive; hydrogen
bonding and Van der Waals forces are strongly attractive.
D. Hydrogen bonding and Van der Waals forces are weakly attractive;
ionic and polar covalent bonds are strongly attractive.
Polar covalent bonds and Van der Waals forces are weakly
attractive; ionic and hydrogen bonds are strongly attractive.
What is the attractive forces that hold particles together?We usually ranked the attractive forces that hold particles together while discussing them. Ionic bonds are the strongest, followed by hydrogen bonds that are somewhat weaker than that, and finally, his disciple disciple forces that are slightly weaker still. Then, Vander Wal's forces, also known as dispersion forces, are the weakest. The first one is ionic compounds, whereas the remaining three are frequently related to molecules or covalin compounds. Consequently, when comparing these attractive forces, the most accurate statement is is one of the first polar covalin bonds to form, resulting in dipole dipole forces. Let's call them polar covalin bonds, then. Van der Waals forces and polar covalin bonds are appealing on a weekly basis; these are the weakest.To learn more about attractive forces refer to:
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Answer:
D. Hydrogen bonding and Van der Waals forces are weakly attractive;
ionic and polar covalent bonds are strongly attractive.
Explanation:
.....
....
......
When shark pups are small what do they eat
Answer:
The baby sharks are not connected to their mum through an umbilical cord. Instead, they feed on their egg's yolk supply, other unfertilized eggs or even the embryos of their brothers and sisters. Through the latter method, only the strongest 1-3 sharks will get born, which is seen in the sand tiger shark.
Explanation:
Which of the following is a trend seen on the periodic table?
O A. Energy in ionic bonds
O B. Number of neutrons
O C. Electronegativity
O D. Mass of the electron
it’s electronegativity (:
Answer:
c
Explanation:
a p e x :)
PLSSSSSS HURRYYYYYYYY
Which of these systems can be explained by Newton’s laws of motion and gravitation?
SELECT ALL THAT APPLY
A.the motion of a race car on a racetrack
B.the motion of Earth around the Sun
C.the motion of a ball falling on Earth
D.the motion of electrons in an atom
Answer:
B,D.
Explanation:
Answer:the motion of Earth around the Sun , the motion of Earth around the Sun , ,
the motion of electrons in an atom
Explanation:
Please help
mg(oh)2
How many H atoms are there?
How many Mg?
What is the total number of atoms?
Answer:
There are 2 hydrogen atoms, one magnesium atom, and 5 atoms in total.
Explanation:
We are given a compound in formula form. To make things easier to understand, we can first convert this to the name of the compound.
When a compound contains one or more elements in parentheses, these are usually a polyatomic ion. Polyatomic ions are ions made up of two or more elements with a positive or negative charge over the entire ion. Commons examples of these NH₄⁺ (ammonia) and HCO₃⁻ (bicarbonate). You can combine metals with polyatomic ions to create commonly known compounds, such as baking soda. The chemical name for baking soda is sodium bicarbonate, so we can combine Na (sodium) with HCO₃⁻ (bicarbonate) and create sodium bicarbonate: NaHCO₃.This compound is one magnesium atom bonded to two hydroxide ions.
Hydroxide is the compound between one hydrogen atom and one oxygen atom. The compound overall adopts a negative charge of 1.If we have one hydrogen atom and one oxygen atom, the most electronegative atom is written first in chemical formulas. Therefore, the symbol for Oxygen (O) goes first.Then, write in the hydrogen atom directly after the O symbol: OH.Finally, since we have a negative charge on the ion, we need to play a negative sign as a superscript for the compound. Therefore, this becomes OH⁻.Now, we need to determine the charge on the Magnesium atom which is determined from the amount of valence electrons the atom has.
On a periodic table, the symbol for Magnesium is Mg and this element has 2 valence electrons. In order to fulfill the Octet Rule, the It is more likely to give up 2 electrons to a nonmetal than it is to gain 6, so we can safely assume that the charge is ²⁺.We need to use the criss-cross technique to transfer the charges between the element and the ion, so the negative 1 charge goes to the Mg, which does not appear (negative 1 or positive 1 are implied) and since the magnesium has a charge of positive 2, this is the subscript for the hydroxide ion.Therefore, our compound becomes Mg(OH)₂, and we have labeled this as magnesium hydroxide.Now, to the number of atoms:
The new charge on Mg is 1-, so there is only one atom of Mg.The charge is 2+ on the OH ion, so there are two atoms of H and two atoms of O.Two atoms of oxygen, two atoms of hydrogen, and one atom of magnesium add up to be five atoms in total.Can somebody plz help answer both these 2 questions ONLY 1-2 sentences if good! thanks :]
WILL MARK BRAINLIEST WHOEVER ANSWER FIRST :DDDDD
I already answered number one, so I'll do number two. A turbine is a machine that spins in order to create energy or electricity, in some cases. The turbine collects the wind and it flows throughout the body of the turbine, where the machine then forms it into electricity.
Answer: 1. Generating energy is the meaning of process, which generates the electric power coming from sources of foremost energy. 2. A turbine is a machine that is for producing constant power, which works by a wheel or rotor, consisting of vanes, made to spin by speedy movement of steam, gas, air, water, etc. Due to this process, it allows for energy to be produced.
Explanation:
Sulfur is a non metallic material that has a density of 2g/cm3. The volume of a sample of sulfur was measured to be 5.0cm3. What is the density of the wood?
question: Sulfur is a non metallic material that has a density of 2g/cm3. The volume of a sample of sulfur was measured to be 5.0cm3. What is the mass of the sulfur
Answer:
0.01 kg
Explanation:
Density: This can be defined as the ratio of mass of a body and it's volume. The S.I unit of volume is kg/m³.
Therefore,
Density = mass/volume
D = m/V......................................................... Equation 1
making m the subject of the equation
m = D×V ................................... Equation 2
Given: D = 2 g/cm³ = 2000 kg/m³, V = 5.0 cm³ = 0.000005 m³
subtitute into equation 2
m = 2000×0.000005
m = 0.01 kg or 10 g
Lab: Ionic and Covalent Bonds
Answer:
see image
Explanation:
Answer:
hope this helps
Explanation:
If X is the symbol of an element, which pair correctly represents isotopes of X
Answer:
What pair???
Explanation:
Answer:
C is the pair that represent the isotopes of x
can someone pls help me im tryna get this done tysm brailiest for free
Answer:
geothite
Explanation:
i did a test on this a few months ago
Answer:
sphalerite i think
Explanation:
Moles /Number of Particles Con
A) Convert the following to Moles
(1) 2.03X1022 atoms of lithium, Li
(2.03x10^22)/(6.02x10^23) = .033721 mol Li
I hope this helps, if not, i am sorry
Based on the image below, what is the displacement of the sound wave for Sound A + B at 0.1025 seconds?
A. -0.3316
B.0.3316
C.0.6255
D.1.6162
Answer:
The displacement of the sound wave for Sound A + B at 0.1025 is;
D. 1.6162
Explanation:
The sum of the displacement of two sound waves is given by the principle of superposition as follows;
y(x, t) = [tex]y_m[/tex]·sin(k·x - ω·t) + [tex]y_m[/tex]·sin(k·x - ω·t + ∅)
Therefore, by the property of the superposition of waves, the amplitudes of linear waves are added linearly when they meet at the same point at a the same time
The given parameters for the wave are;
The time at which the value of the wave amplitude are given, t = 0.1025 seconds
The displacement of the sound wave A at the given time, "t" is A = 0.9739
The displacement of the sound wave B at the given time "t" is B = 0.6423
Therefore, the displacement of the sound A + B = 0.9739 + 0.6423 = 1.6162
Which is an example of radiation?
O Troy's hand is burned when he touches hot wax.
O Earth is heated by energy from the Sun.
O Ahot dog is held over a fire and gets warm.
O Water is boiled in a pot on a stove burner.
The statement which is considered to be a good example of radiation is: B. Earth is heated by energy from the Sun.
The types of heat transfer.In Science, there are three (3) main types of heat transfer and these include:
ConductionConvectionRadiationWhat is radiation?Radiation can be defined as the transmission (transfer) of energy in the form of waves particles through a material medium or space. Thus, radiation is a type of heat transfer which causes a person on Earth that is sitting under the Sun to feel warm.
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We add 5.0 g of sugar to 100 mL of water.
What is the mass of the solution?
The mass of the solution : 105 g
Further explanationGiven
5 g sugar
100 ml water
Required
The mass of the solution
Solution
Density is a quantity derived from the mass and volume
Density is the ratio of mass per unit volume
Density formula:
[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]
ρ = density
m = mass
v = volume
Density of water = 1 g/ml
So mass of water :
= density x volume
= 1 g/ml x 100 ml
= 100 g
So total mass of solution :
=mass sugar+mass water
= 5 g + 100 g
= 105 g
Which feature does an iron metal have?
O electrons that transfer between atoms to make cations and anions
O a sea of electrons
O firmly bonded electrons
O electrons shared between single pairs of atoms
Answer:
a sea of electrons
Iron metal has a sea of electrons.
Iron metal is an element which possesses a sea of electrons as a result of it
containing cations which are usually surrounded by electrons which move at
a very fast pace .
This property makes Iron metal to be reactive when exposed to air( oxygen)
and it then forms various compounds such as Iron(II) oxide, Iron(III) oxide and
rust.
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How can people conserve water at home?
rinsing dishes with cold water instead of warm water
washing dishes only when the dishwasher is full
bathing pets with a hose instead of a bucket
eating fish bought from the store
Answer:
washing dishes only when the dishwasher is full
Explanation:
Out of the following options, the best way to conserve water is:
B. washing dishes only when the dishwasher is full
Ways to conserve water:Conserving water is important because it keeps water pure and clean while protecting the environment.
Turn off the faucet while brushing your teeth.Only run the washing machine and dishwasher when you have a full load.Use a low-flow showerhead and faucet aerators.Fix leaks.Take a Shower of 5 Minutes or Less. Install a Water-saving Toilet Flush System.Thus, option B is correct.
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5. CaCO, - CaO+CO,
Reaction Type
Answer:
(a) Decomposition: A substance breaks down to smaller species. [e.g. CaCO3(s) → CaO(s) + CO2(g) Decomposition of limestone to calcium oxide (quicklime) and carbon dioxide on heating.]
Hi, can someone help me balance this chemistry equation:
H2SO4 + RbOH -> Rb2SO4 + H2O
H2SO4 + 2RbOH -> Rb2SO4 + 2H2O
If you want an explanation, keep reading.
In the first portion, there are two hydrogen ions and four sulfate ions.
The second portion has one rubidium ions and one hydroxide ion.
On the other side of the equation, in order to keep those two rubidiums balanced, you'll need to add a two at the beginning of the second portion, but in that process you are giving a second hydroxide value.
Back to the right side, there is there is water (H2O).
On the first portion, there were two hydrogen ions. The second portion also has two hydroxides because of the value change (adding the two to the front).
So on the fourth portion, you'd have to add another two so you could balance the four hydrogen ions (H2 and 2OH) and the two oxygen ions (2OH).
I hope this was easy to understand.
Can someone answer all 3 questions plz?
Question one should be obvious..
Mass can't be created not destroyed no matter what, so even in a chemical reaction, the answer will remain. The first answer is correct.
Question two
No, because even when water is broken down, there should only be one molecule of oxygen. The fact there is two means it's incorrect.
Question three
Yes. The equation is perfectly balanced on both sides, so it's safe to say the value of mass remains constant.
Helpp
Me pls. I need help
Answer:
P = momentum
m = mass
v = velocity
Answer:
P = Momentum
M = Mass
V = Velocity
Explanation:
P = Momentum : The quantity of motion of a moving body, measured as a product of its mass and velocity.
M = Mass : A coherent, typically large body of matter with no definite shape.
V = Velocity : The speed of something in a given direction.
Explain how scientists
came to the conclusion that “All living things are made of cells".
Answer:
scientist came to the conclusion that all living things are made of cells by con
Explanation:
DUE TOMORROW!!! 15 POINTS
please help!! the answers are already given i just need to show work :( ive been stuck on this for an hour now
Answer:
A. write balanced chemical equation (including states), for this process.
Explanation:
Almost all hydrocarbon 'burn' reactions involve oxygen; it's by far the most reactive substance in air.
Hydrocarbon combustions always involve
[some hydrocarbon] + oxygen --> carbon dioxide + steam.
C6H6(l) + O2 (g)--> CO2 (g)+ H2O (g)
Balance carbon, six on each side:
C6H6(l) + O2 (g)--> 6CO2 (g)+ H2O (g)
Balance hydrogen, six on each side:
C6H6(l) + O2 (g)--> 6CO2(g) + 3H2O (g)
Now, we have fifteen oxygens on the right and O2 on the left.
Two ways to deal with that. We can use a fraction:
C6H6 (l)+ (15/2)O2 (g)--> 6CO2 (g)+ 3H2O (g)
Or, if you prefer to have whole number coefficients, double everything
to get rid of the fraction:
2C6H6 (l)+ 15O2 (g)--> 12CO2 (g)+ 6H2O (g)
With the SATP states thrown in...
C6H6(l) + (15/2)O2(g) --> 6CO2(g) + 3H2O(g)