Select the best answer.
Which element's atoms are most likely to touch each other without overlapping?
iron
hydrogen
carbon
radon
Answer: iron
Explanation: Metals' atoms are closely bonded in a crystal lattice. In metallic bonds, the electron cloud boundaries of atoms touch each other. Many nonmetals occur as diatomic molecules. The electron clouds of these two bonded nonmetal atoms overlap .
Hydrogen atoms are most likely to touch each other without overlapping because of their small size and simple atomic structure.
A hydrogen molecule is a particle of the synthetic component hydrogen. The electrically unbiased molecule contains a solitary emphatically charged proton and a solitary adversely charged electron bound to the core by the Coulomb force. Nuclear hydrogen is around 75% of the baryonic mass of the universe.
Hydrogen exist as diatomic particle, I.e., it can exist by attaching to another hydrogen. You realize that hydrogen has just a single electron in it's furthest and just shell. Yet, to accomplish a steady design, there should be two electrons in this shell. So two hydrogen molecules share their electrons by holding.
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What type of element are the following elements?
A) Na
B) Со
C) Bi
D) O
The table describes some characteristics of a layer of earth
Which layer is described by the data in the table?
crust
mantle
outer core
inner core
Answer:
crust .......
.........
what is kinetic enegry
Kinetic energy → the kinetic energy of an object is the energy that it possesses due to its motion
For an example ↓
Scientists believe the evidence to support the Big Bang Theory is that the Universe is________
Shrinking
Still expanding
Answer:
The Universe will continue to expand :)
Explanation:
Dark matter reverses the effect of gravity in some cases, and the Doppler effect also supports this claim, in which it states that the later the star has formed, the farther away it will be from the center/origin point of our universe.
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which is a semi conductor? metal, nonmetal, mettaliod
Answer:
mettaliod
Explanation:
Answer:
Metalloids have properties intermediate between the metals and nonmetals. They can form alloys with other metals. … Some metalloids, such as silicon and germanium, can act as electrical conductors under the right conditions, thus they are called semiconductors.
Explanation:
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Alkali metals react violently with water. How much Hydrogen gas (in g) is produced when 10.0 g of sodium reacts with excess water according to the following equation?
2Na + 2H2O ----> 2NaOH + H2
The mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
From the question,
We are to determine the mass of Hydrogen gas produced when 10.0g of sodium reacts with excess water.
From the balanced chemical equation for the reaction
2Na + 2H₂O → 2NaOH + H₂
This means
2 moles of sodium reacts with 2 moles of water to produce 2 moles of sodium hydroxide (NaOH) and 1 mole of Hydrogen gas.
Now, we will determine the number of moles of sodium present
Mass of sodium = 10.0 g
Atomic mass of sodium = 22.99 g/mol
From the formula
[tex]Number\ of\ moles\ = \frac{Mass}{Molar\ mass}[/tex]
∴ Number of moles of sodium present = [tex]\frac{10.0}{22.99}[/tex]
Number of moles of sodium present = 0.43497 mole
From the balanced chemical equation
2 moles of sodium reacts with 2 moles of water to produce 1 mole of Hydrogen gas.
Then,
0.43497 mole of sodium will react with 0.43497 mole of water to produce [tex]\frac{0.43497}{2}[/tex] mole of Hydrogen gas
[tex]\frac{0.43497}{2} = 0.217485[/tex]
∴ 0.217485 mole of Hydrogen gas was produced during the reaction
Now, for the mass of Hydrogen gas produced
Using the formula
Mass = Number of moles × Molar mass
Molar mass of H₂ = 2.016 g/mol
∴ Mass of Hydrogen gas produced = 0.217485 × 2.016
Mass of Hydrogen gas produced = 0.43845 g
Mass of Hydrogen gas produced ≅ 0.44 g
Hence, the mass of Hydrogen gas produced when 10.0 g of sodium reacts with excess water is 0.44 g.
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How does the rock cycle and plate tectonics interfere with geochemists trying to determine the age of the Earth? Chose the best answer.
The rock cycle and plate tectonics cause Earth to lose its outer layer every one billion years as it creates new crust.
The rock cycle and plate tectonics cause Earth's rocks to break down over time and they are recycled through natural processes.
The rock cycle and plate tectonics cause Earth's original rocks to be buried deep in the ocean where they cannot be discovered.
Answer:
The rock cycle and plate tectonics cause Earth's rocks to break down over time and they are recycled through natural processes.
Explanation:
Rock cycle(Attachment-1)
The rock cycle and plate tectonics cause Earth's rocks to break down over time and they are recycled through natural processes is the best answer.
What are rock cycle?The rock cycle is defined as the process through which the three main rock types i.e. igneous, metamorphic and sedimentary rock transfer from one type to another type.
The plate tectonics is defined as a theory that earth's outer shell is divided into large slabs of solid rocks known as "plates" that glide over earth mantle, the rocky inner layer above earth's core.
Thus, the rock cycle and plate tectonics cause Earth's rocks to break down over time and they are recycled through natural processes is the best answer.
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At this location, it is winter because the North Pole is tilted
Towards the sun
Away from the sun
Answer:
Away from the sun
Explanation:
winter
In the Northern Hemisphere, winter generally begins on December 21 or 22. This is the winter solstice, the day of the year with the shortest period of daylight. Summer begins on June 20 or 21, the summer solstice, which has the most daylight of any day in the year.
please help my little brother on this I don't get it either free brainless
Answer:
igneous rock is the correct answer
L 2.5.2 Test (CST): Computer-Scored Unit Test
Question 5 of 25
How does increasing the temperature affect a reaction?
A. An increase in temperature slows down the reaction.
B. An increase in temperature increases the reaction rate.
C. An increase in temperature lowers the reaction's activation energy.
D. An increase in temperature changes equilibrium concentrations.
SUBMIT
Answer:
b
Explanation:
The concept Arrhenius equation is used here to determine the temperature dependence of the rate of a reaction. An increase in temperature increases the rate of a reaction. The correct option is B.
What is Arrhenius equation?The rate of a chemical reaction is affected by the factors like temperature and activation energy. The influence of these factors on the rate of the reaction is explained by the Arrhenius equation.
The equation is given as:
[tex]k = A. e^{-} ^{E_{a} } /RT[/tex]
k - Rate constant
A - Frequency factor
Eₐ - Activation energy
R - Gas constant
T - Temperature
Since 'Temperature' appears in the denominator of the negative power of the exponential factor of the equation, it is evident that an increase in temperature increases the value of rate constant and thereby increases the rate of the reaction.
Thus the correct option is B.
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Look at diagram 1 above. What type of eclipse is shown based on the alignment of the Earth, Sun, and Moon?
Solar eclipse
Lunar eclipse
You have a gas sample of carbon dioxide at 298 K. If the pressure is 0.827 atm what is the pressure in mmhg
Answer:
628.520 mmHg
Explanation:
1 atm = 760 mmHg
[tex](760 \div 1) \times 0.827[/tex]
The pressure of 0.827 atm in mmHg is 628.52 mmHg
Pressure has various units of measurement such as atmosphere (atm), pascal, mmHg, Newton per square metre (N/m²) etc. These units can be converted from one to the other.
Considering the question given above, we can convert 0.827 atm to mmHg as illustrated below:
1 atm = 760 mmHg
Therefore,
0.827 atm = 0.827 × 760
0.827 atm = 628.52 mmHg
Thus, 0.827 atm is equivalent to 628.52 mmHg
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Si a un resorte se le cuelga una masa de 800 g y se deforma 50 cm. ¿Cuál será el valor de su constante en N/m? (g = 9.81m/s2).
Answer:
50cm
Explanation:
because thats the only thing i got
What are the sources of petrochemicals
Answer:
Petrochemicals are chemical products derived from petroleum, although many of the same chemical compounds are also obtained from other fossil fuels such as coal and natural gas or from renewable sources such as corn, sugar cane, and other types of biomass.
Answer:
The sources of petrochemical are: fossil fuel such as coal and natural gases or from renewable sources such corn, sugar, cane and other types of biomass .
Explanation:
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Look at the graph above showing the composition of air. Which component is the solvent?
The component that would be the solvent from the graph would be nitrogen.
From the graph, nitrogen takes up 78%, oxygen had 21%, while the remaining gases take the remaining 1%.
A solvent is a substance or the component of a solution that has the capacity to dissolve other substances
In a mixture consisting of 2 or more substances, the substance with the highest volume usually acts as the solvent.
In this case, nitrogen holds the highest volume of all the gases in the graph. Thus, it can be considered as the solvent while the remaining gases are the solutes.
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Polymers are large organic molecules that are made of
a.
cations.
c.
carbon and oxygen only.
b.
anions.
d.
repeating units.
Answer:
D) Repeating units.
Explanation:
Polymers are large macromolecules which are made up of many repeating structural units called monomers :)
help please !!! THANK YOU !
Answer:The nucleus emits particles and/or energy.
Explanation:
Why are iron oxides in rocks evidence for prehistoric photosynthesis? (1 point)
o Iron oxides form when carbon dioxide, a reactant of photosynthesis, is in the atmosphere.
o Iron oxides form when cyanobacteria use carbon dioxide for photosynthesis.
o Iron oxides form when cyanobacteria produce oxygen via photosynthesis.
o Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
Answer:
Iron oxides form when oxygen, a product of photosynthesis, is in the atmosphere.
When floating a ping-pong ball with a hairdryer, which two forces are balanced?
Answer:
The ping-pong ball will fly up with the air from the hair dryer until it reaches a point of balance – this is where the force of gravity (which pushes the ping-pong ball down) is equal to the force of the air (which is pushing the ping-pong ball up) hop it helps:)
Noble gas:
Oxygen
Chlorine
Or Krypton
Answer:
Krypton
Explanation:
Answer:
C
Explanation:
trust me :)
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Read the following statement:
For every action, there is an equal and opposite reaction.
Does the statement describe a scientific law?
Yes, because it describes action-reaction force pairs
No, because it describes action-reaction force pairs
Yes, because it is applicable to a single or only a few events in the natural world
No, because it is applicable to a single or only a few events in the natural world
Yes, because it describes action-reaction force pairs
Copy and Complete these sentences to describe how particles are arranged in solids, liquids, and gases.
In solids, the particles are arranged ____________________
In liquids, the particles are arranged ____________________
In gases, the particles are arranged ____________________
Answer:
soilds - close together arranged in a regular way
liquids - close together arranged in a random way
gases - far apart arranged in a random way
Explanation:
describe another medical condition or disease where the primary system causes a serious problem with a secondary system
Answer:
Congestive heart failure
Explanation:
Congestive heart failure happens when your heart gets too weak to pump blood from the lungs out to the body. Pressure builds up in the heart which puts pressure on the blood vessels of the lungs. This will lead to leakage of the vessels and the fluids build up in the air sacs of the lungs. This condition is called pulmonary edema.
Pulmonary edema occurs when fluid builds up in the lungs making it hard to breathe. It may start out as running out of breath easily but if left untreated (both conditions) symptoms get worse over time.
Which letter in the diagram represents the transition from liquid to gas?
A
B
C
D
B, D in the diagram represents the transition from liquid to gas. A phase diagram is a sort of figure that is used in physical chemistry.
What is phase diagram?A phase diagram is a sort of figure that is used in physical the field of chemistry engineering, mineralogy, as well as materials science to demonstrate the conditions (pressure, temperatures, volume, etc.) that exist when thermodynamically different phases (such solid, liquid, or gaseous states) arise and coexist at equilibrium.
Lines of equilibrium, also known as phase boundaries, or circumstances under which different phases may exist at equilibrium, are typical elements of a phase diagram. Phase changes take place along equilibration lines. Despite their frequent occurrence, metastable phases are not equilibrium phases, hence they are not depicted on phase diagrams. B, D in the diagram represents the transition from liquid to gas.
Therefore, B, D in the diagram represents the transition from liquid to gas.
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Which location in the diagram above is the Southern Hemisphere experiencing summer?
Location A
Location B
Location C
Location D
Answer:
location a
Explanation:
Answer:
Location B
Explanation:
Which tool should Darla and Rob use to measure the force that pulls a car down the map
Answer:
C. A Spring Scale
Explanation:
Using process of elimination, we can quickly decide that a stopwatch and a ruler will not be useful in measuring the force. This leaves us with either the spring scale or a balance scale. A balance scale is used to compare two weights, so this is eliminated. That leaves us with a spring scale. This is because we can attached the spring scale to the car and when we let it go, we can record the force. I hope this helps!
Write the equation for the alpha decay of C-11.
Write the equation for the beta decay of Be-10
HELP HELP HELP
Answer:
We know that in the decay process the sum of molecular number as well as molecular weight should be constant.
The following three reaction are as follows
1 .
Explanation:
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looking for some help here,
Liquid A has a mass of 80 grams and a volume of 10 ml. What is liquid A's density?
1: 1.25 g/ml
2: 800 g/ml
3: 8 g/ml
4: 80 grams
If Bromine has a charge of 1-, how many electrons does it have?
Answer:
35
Explanation:
The atomic number for bromine is 35, which means it has 35 protons in its atomic nuclei. A neutral bromine atom would also have 35 electrons. In order for a bromine atom to become a
1
−
bromide ion, it would have to gain an additional electron.