Answer:
because of nothing...............................
A bird flies from its nest to a lake for food and water. The nest and lake are 2 miles apart. It takes the bird 10 minutes to get from the nest to the lake. What is its average speed in mi/min?
What is
metal refinning
Answer:
It is the way of cleaning of impurities present in metals
The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO). 2Mg O2 Right arrow. 2MgO The molar mass of O2 is 32. 0 g/mol. What mass, in grams, of O2 is required to react completely with 4. 00 mol of Mg? 2. 00 grams 64. 0 grams 128 grams 256 grams.
Magnesium or metal reacts with oxygen to produce magnesium oxide or metal oxide. The mass of oxygen needed to completely react with magnesium is 64 g.
What is mass?Mass is the weight or the quantity of the substance that is estimated in grams and kilograms.
The balanced reaction can be given as:
[tex]\rm 2Mg + O_{2} \rightarrow 2MgO[/tex]
From the balanced reaction, 2 moles of magnesium and 1 mole of oxygen are required to produce 2 moles of magnesium oxide.
If 2 mol Mg requires 1 mol oxygen then, 4 mol Mg will need 2 mol of oxygen.
The mass of oxygen can be calculated as:
[tex]\begin{aligned}\rm mass &=\rm molar\; mass \times moles \\\\&= 32 \times 2\\\\&= 64 \;\rm gm\end{aligned}[/tex]
Therefore, option B. 64 gm of oxygen are required.
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Chemical reactions involve the rearrangement of atoms.
True
False
Answer:
True
Explanation:
In a chemical reaction, bonds between atoms in the reactants are broken and the atoms rearrange and form new bonds to make the products.
Answer:
true
Explanation:
chemical reactions use reactants, to form products, and the process involves rearranging atoms :)
who was the first person to create the periodic table
Answer:
Dmitri Ivanovich Mendeleev
Explanation:
A Russian chemist Dmitri Ivanovich Mendeleev gave the framework of the periodic table in 1869
Answer:
the first person was Dimitri mendeleev
Show the reaction : Phenol to benzene
The reaction is given by
[tex]\\ \rm\Rrightarrow C_6H_5OH+Zn\longrightarrow C_6H_6+ZnO[/tex]
Answer:
See below ~
Explanation:
20pts!!!! Plutonium will go through alpha decay. Which nuclear equation is correct?
Answer:
by my knowledge, i think it is the 3rd option.
Explana tion:
There are well over 100 __________________ that exist on Earth
Answer:
species like plants, animals , human etc
Answer:
Dogs, Chocolate, Tvs, Phones.
Explanation:
2. How have observations of the natural world helped
in the development of calendars?
Answer:
just wanted points
Explanation:
i wasted your time srry
Helppp mee plz guysss
Answer:
11 and a half
Explanation:
well it luks to be
Answer:
11.5 cm
Explanation:
jsosne92he9dbw9wns9wne9dbe8d
1. Which example below would not be found on primitive Earth?
volcanoes
lightning storms
oxygen gas
ammonia gas
2. Which event would have occurred by the end of the Hadean era?
Asteroid and comet bombardment had increased.
Earth’s crust had cooled and solidified
Lightning storms had stopped completely.
Free oxygen was available in the atmosphere.
3.
Classify Earth’s current atmosphere.
secondary atmosphere
quaternary atmosphere
primary atmosphere
tertiary atmosphere
Answer:
1. oxygen gas
2. Asteroid and comet bombardment had
increased
3. A secondary atmosphere is an atmosphere of a planet that did not form by accretion during the formation of the planet's star. A secondary atmosphere instead forms from internal volcanic activity, or by accumulation of material from comet impacts.
The climate of the Quaternary period showed several decreases in global temperature (glacial periods) separated by warm (interglacial) periods. Core samples taken from sea beds elude to at least sixteen glaciations during the Quaternary period.
A primary atmosphere is an atmosphere of a planet that forms by accretion of gaseous matter from the accretion disc of the planet's sun. Planets such as Jupiter and Saturn have primary atmospheres. Primary atmospheres are very thick compared to secondary atmospheres like the one found on Earth.
Now we have Earth's “third atmosphere,” the one we all know and love—an atmosphere containing enough oxygen for animals, including ourselves, to evolve. So plants and some bacteria use carbon dioxide and give off oxygen, and animals use oxygen and give off carbon-dioxide—how convenient!
For problems 1-9, use rectangle QUAD. Treat each problem independently
The value of DP in the rectangle QUAD can be gotten by equating DP and DA which will be 17 units.
How to solve the rectangle?From the complete question, DP = 4x + 1, and PA = x + 13. In this case, the value of DP will be calculated thus:
DP = DA (property of rectangle)
4x + 1 = x + 13
Collect like terms
4x - x = 13 - 1
3x = 12
Divide both side by 3
3x/3 = 12/3
x = 4
Therefore, DP will be:
= 4x + 1
= 4(4) + 1
= 16 + 1 = 17
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Which area is most likely to support a marsh ecosystem?.
Answer:
A location that is humid, would most likely support a marsh ecosystem.
Explanation:
The Florida Everglades are an example of a marsh :)
"Marshes are a type of wetland ecosystem where water covers the ground for long periods of time. Marshes are dominated by herbaceous plants, such as grasses, reeds, and sedges."
SOMEONE PLEASE HELP LIKE ASAP ITS DUE IN A COUPLE MINUTES AND I MARK BRAINLIEST
first one: like charges
second one: opposite charges
third one: opposite charges
fourth one: opposite charges
yw :)
Anyone know the answer to this question
Answer:
Construction
Explanation:
How much space does 750.00 g of a substance occupy it if has a density of 0.78 g/mL?
Answer:
The substance occupy 961.54 cm³ space.
Explanation:
Given data:
Mass of substance = 750.00 g
Density of substance = 0.78 g/mL
How much space it occupy = ?
Solution:
The space occupy by the substance is equal to its volume. Thus we will calculate the volume by applying density formula. Which is actually the space cover by substance.
d = m/v
d = density
m = mass
v = volume
0.78 g/mL = 750.00 g/ v
v = 750.00 g/ 0.78 g/mL
v = 961.54 mL
1 mL = 1 cm³
v = 961.54 cm³
Thus substance occupy 961.54 cm³ space.
Element X has 2 following stable isotopes, X-23 (relative abundance 41.9%) and X-25 (relative abundance is [100-41.9]%). What is the average atomic mass of Element X? Record the numerical answer to the hundredths place (2 places after the decimal).
Isotopes : the same atomic number, but different mass numbers
Atomic mass is the average atomic mass of all its isotopes
avg atomic mass = m1.%m1 + m2.%m2....mn.%mn
You did not include the mass of each isotope
Element X :
X-23 = 41.9%
X-25 = 58.1%
The average atomic mass of Element X :
[tex]\tt =0.419\times mass~X-23+0.581\times mass~X-25[/tex]
What occurs during a solar eclipse?
Earth is closest to the Sun.
There are small tides across Earth.
The moon’s shadow falls on Earth.
The moon is covered in Earth’s shadow.
Answer:
Explanation:
option C is correct
Answer:
The moon is covered in Earth’s shadow.
Explanation:
When the moon goes behind the earth to the shadow it becomes a solar eclipse.
PS, Can you mark me brainlyest please.
how does energy transfer from computer to speaker plz help fasttt
Answer:
As the coil moves through the magnetic field, created by the magnet, an electric current flows through it. The electric current flows out from the microphone to a computer or other recording device, and you can hear it. Aspeaker works in almost the same way, except that the process isreversed.
How does heat transfer? *
cold object to cold object
cold object to hot object
hot object to cold object
hot object to hot object
Answer:
hot object to cold object
2. A submarine is able to raise and lower itself
underwater. A rock sinks when it is dropped in a
pool because it is denser than water. A piece of
wood floats in the pool because it is less dense
than water. What could the submarine change in
order to sink or float? Choose all that apply.
A. the submarine's volume
B. the submarine's mass
C. the state of the surrounding water
D. the mass of the surrounding water
Answer:
I think it's the state of the surrounding water because if the water holds impurities it will float and if it doesn't have impurities it will sink
A submarine is able to raise and lower itself underwater. A rock sinks when it is dropped in a pool because it is denser than water. A piece of wood floats in the pool because it is less dense than water. If we want to change in sink or float of submarine then we must change the state of surrounding water. Thus, option c is correct.
How a submarine is float in water while a small stone is sink in water?According to Archimedes's principle the upward buyout force that is exerted on a body immersed in a fluid whether fully or partially, is equal or less than the fluid that the body displaces.
Mathematically
Buyout force = Fb=-pgv
Where
p= density of fluid
g= acceleration due to gravity
v = Volume of fluid
So, if a object is floating in the water then buyout forces must be equal to their weight, and for that weight of water that is displaced by object must be greater than or equal to the weight of object. So object is floating.
Therefore, a submarine is able to raise and lower itself underwater. A rock sinks when it is dropped in a pool because it is denser than water. A piece of wood floats in the pool because it is less dense than water. If we want to change in sink or float of submarine then we must change the state of surrounding water. Thus, option c is correct.
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what happens when throw up then eat it again?
Can some inherited traits be changed by an organism's environment?
Some inherited traits can be changed by an organism's environment because environment has a direct impact on organisms.
Can inherited traits be changed by environment?Traits allow a plant, animal, or other organism to survive and reproduce in its environment which is known as adaptations. Natural selection occurs when there is some variation in the inherited traits of organisms within a species.
So we can conclude that some inherited traits can be changed by an organism's environment because environment has a direct impact on organisms.
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Which method of finding slope do you prefer? Why?
(slope formula, table, other)
Water, H20, is a molecule made of oxygen and hydrogen. The bonds that hold water
bonds.
molecules together are due to shared electrons, and known as _______ bonds
Answer:
the answer is convalent bonds
Explanation:
Strong linkages—called covalent bonds—hold together the hydrogen (white) and oxygen (red) atoms of individual H2O molecules. Covalent bonds occur when two atoms—in this case oxygen and hydrogen—share electrons with each other.
i hope this helped
A pipet is used to transfer 5.00 mL of a 1.25 M stock solution in flask "S" to a 25.00-mL volumetric flask "B," which is then diluted with DI H2O to the calibration mark. The solution is thoroughly mixed. Next, 3.00 mL of the solution in volumetric flask "A" is transferred by pipet to a 50.00-mL volumetric flask "B" and then diluted with DI H2O to the calibration mark. Calculate the molarity of the solution in volumetric flask "B."
Answer:
The answer is "0.015 M ".
Explanation:
[tex]M_1 = 1.25 \ M\\\\M_2 = M_2\\\\V_1 = 5.00 \ mL\\\\V_2 = 25.00 \ mL \\\\\bold{\text{Formula:}}\\\\\to M_1 \times V_1 = M_2\times V_2\\\\\to M_2 = \frac{ M_1 \times V_1}{V_2}\\\\=\frac{( 1.25 \times 5.00 )}{ 25.00}\\\\=\frac{( 6.25 )}{ 25.00}\\\\= 0.25 \ M \\\\[/tex]
If the volume [tex]V_2 = 3.00 \ mL[/tex]
[tex]M_3=M_3 \\\\V_3 = 50.00 \ mL\\[/tex]
Formula:
[tex]M_3 = \frac{M_2 \times V_2}{V_3}[/tex]
[tex]= \frac{ 0.25 \times 3.0}{50.0}\\\\ = \frac{ 0.75}{50.0}\\\\ = 0.015 \ M \\\\[/tex]
What is occurring with the energy and molecules in a metal that is melting?
Answer:
Melting, or fusion, is a physical process that results in the phase transition of a substance from a solid to a liquid. This occurs when the internal energy of the solid increases, typically by the application of heat or pressure, which increases the substance's temperature to the melting point.
what is the orbital diagram for silicon
Answer: Silicon the first two electrons will go in the 1s orbital. Since 1s can only hold two electrons the next 2 electrons for Silicon go in the 2s orbital. The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.
Hope this helps! :)
What happens during an El Nino event?
o
All of the Above
Droughts and Tropical Storms are stronger
O
The water of the Pacific Ocean gets warmer
O
The trade winds reverse the direction they normally blow in
28. The IUPAC name for OH is
(a) benzophenol
(b) hydroxyphenol
(c) hydroxybenzene
(d) phenol
Answer:
A
Explanation: