Answer:
4 atoms of oxygen
Explanation:
2 atoms of oxygen gas O2
Answer:
4 atoms of oxygen
Explanation:
The given chemical formula is:
2CO₂
Unknown is the number of atoms;
There are :
C : 2 atoms of carbon
O: (2 x 2) atoms of oxygen in the given molecule
4 atoms of oxygen
Make a claim about why scientists might have two ways for thinking about Earth's layers. Summarize evidence to support the claim and explain your reasoning.
Answer:
Direct evidence from rock samples and indirect evidence from seismic waves may account for why scientists have two ways of thinking about earth's layers
Explanation:
Scientists who study about the earth's structure and components called geologists have two main types of evidence to learn about Earth's interior namely
1. direct evidence from rock samples
2. indirect evidence from seismic waves
Direct evidence From Rock Samples
Scientists examine rocks from inside the Earth and these rocks give them clues about Earth’s structure. Some scientists have drilled holes as much as 12 kilometers into Earth and bring up samples of rock. From these samples, they can make inferences about conditions deep inside Earth, where these rocks formed. In addition, forces inside Earth sometimes blast rock to the surface from depths of more than 100 kilometers. These rocks from deep within the Earth provide more information about the interior.
Indirect evidence From Seismic Waves
Since scientist cannot look inside Earth, they have devised an indirect methods of observation by using seismic waves. When earthquakes occur, they produce seismic waves. Scientists record the seismic waves and study how they travel through Earth. The speed of seismic waves and the paths they take reveal the structure of the planet. Using data from seismic waves, scientists have learned that Earth’s interior is made up of several layers with each layer surrounding the layers beneath it.
What does it mean if a cell has a positive voltage?
O A The reaction will occur if energy is added.
O B. The reaction will occur naturally
C. The reaction is not spontaneous.
D. The reaction will not occur naturally.
Answer:
B
Explanation:
The reaction will occur naturally
Answer:
B. A pE x
Explanation:
Trust
options are:
1. Kelvin
2. Grams
3. Degrees Celcius
4. Degrees Fahrenheit
Answer:
1. Kelvin
Explanation:
The standard temperature for scientific report is the kelvin.
According to the SI unit definition, temperatures should reported in Kelvin.
On the kelvin scale, the freezing point of water is 273kThe melting point of water is 373k The kelvin is widely accepted in scientific climes. It is possible to convert from this scale to another.please answer this question for me I will answer your questions too I promise!!
Answer:
C
Explanation:
The airplanes speed would decrease
Which metalloid is often found in microchips, semiconductors, and sand?a. boron b. arsenic c. germanium d. silicon
Answer:
silicon
Explanation:
Silicon. Silicon is often found in electronic devices, as well as the sand.
hope this helps UwU
Aqueous copper(II) nitrate reacts with aqueous sodium sulfide to produce aqueous sodium nitrate and copper(II) sulfide as a precipitate. In this reaction 469 grams of copper(II) nitrate were combined with 156 grams of sodium sulfide to produce 272 grams of sodium nitrate.
Yield of reaction = 80%
Further explanationReaction
Cu(NO₃)₂ (aq) + Na₂S (aq) ⇒ 2 NaNO₃ (aq) + CuS (s)
mol Cu(NO₃)₂ :(MW 187,56 g/mol)
[tex]\tt \dfrac{469}{187.56}=2.5[/tex]
mol Na₂S :(MW 78,0452 g/mol)
[tex]\tt \dfrac{156}{78.0452}=2[/tex]
Limiting reactant⇒Na₂S( 2 < 2.5)
mol of NaNO₃ (MW = 84,9947 g/mol)
[tex]\tt 2\times 2=4[/tex]
mass NaNO₃ (theoretical)
[tex]\tt 4\times 84.9947=339.979~g[/tex]
yield[tex]\tt \dfrac{272}{339.979}=0.8\rightarrow=80\%[/tex]
Differentiate between acids and bases on the basis of their pH values. Give an example of each type.
Bases are the chemical opposite of acids. Acids are defined as compounds that donate a hydrogen ion (H+) to another compound.
Definition of Acids - An acid is any chemical compound which when dissolved in water gives a solution with a hydrogen ion activity greater than in pure water. Bronstead Lowry
Definition of Base - A base is an aqueous substance that can accept hydrogen ions. Bronstead Lowry Definition: A base is any substance which accepts a proton.
Physical Characteristics of Acids - Depending on the temperature, acids can occur in solid, liquid or gaseous form. Taste sour.
Physical Characteristics of Base - Bases feel slippery because of the reaction of the base with the oils of your hand. Frequently solids except ammonia which is a gas. Taste bitter.
Properties of Acids - Electrolytes, conduct electricity (because electrolytes), react with many metals.
Properties of Base - Electrolytes, conduct electricity, ranges from insoluble to so soluble that they can react with water vapor.
Acids are often used to remove rust from metals, as an electrolyte in batteries, for mineral processing, to produce fertilizers and gasoline and as additives in food and beverages. Bases are used primarily in cleaning as dishwashing and laundry detergents, oven cleaners and stain removers.
Here are some differences! Hope this helps, sorry I couldn't think of anything else. ;(
HELP AGAIN!!!
Which item in Figure 1 expanded the most when heated?
aluminum
steel
glass
oak
How is this person able to stay on the skateboard? explain
Gravity, friction, and balance keeps people able to not fall off a skateboard.
Please help me the picture is above, I’ll mark as brainliest.
What two things do you need to determine speed
the distance traveled and the time it took to travel that distance
NO ONE ANSWERS MY QUESTIONS
answered
Continue off my answer
Choose one of the compounds from the table and explain how you know the numbers of atoms in your formula. Carbon Monoxide (co) is a mix of carbon and oxygen and when they mix they make carbon monoxide.
Answer:
where is the answer options because it sounds like I need some
Answer:
Sodium Hydride=NaH which has 1 sodium atom, and 1 hydrogen atom, i know this because there are no added numbers meaning theres one of each element.
Explanation:
If a 2kg bird is pushed by the wind with a force of 2N, how fast does the
bird accelerate?
O 1m
O 2 m/s2
O 4m/s2
O 1 m/s2
The bird will accelerate with an acceleration of 1 m/s². Therefore, option (4) is correct.
What is acceleration?Acceleration of a body can be explained as the change of velocity of a body with respect to time. The acceleration of a body is a vector parameter with both magnitude and direction. Acceleration can be defined as the 2nd derivative of position with respect to time.
According to Newton's 2nd law of motion, force is the product of the mass and acceleration of an object.
F = ma
And, a = F/m
Therefore, the acceleration and mass of a body have an inverse relationship.
Given, the force acting on the bird, F = 2 N
Given the mass of the bird, m = 2Kg
The acceleration in the speed of the bird can be calculated as:
a = F/m
a = 2N/2 Kg
a = 1 m/s²
Therefore, the bird accelerates at 1 m/s² because of the wind.
Learn more about acceleration, here:
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PLEASE HELP!!!!!!!
1. _____ - the phase change in which a substance changes from a liquid into a gas.
Vaporization
Heat of vaporization
Condensation
Evaporation
2. _____ - the process that changes a substance from a liquid to a gas at temperatures below the substances boiling point.
Vaporization
Condensation
Evaporation
Heat of vaporization
3. _____ - the energy a substance must absorb in order to change from a liquid to a gas.
Vaporization
Condensation
Heat of vaporization
Evaporation
4. The arrangement of molecules in water becomes less orderly as water melts and _____ orderly as water freezes.
more
less
Other:
Answer:
1. Vaporization
2. Evaporation
3. Heat of vaporization
4. more
Explanation:
This problem deals with a phase change from liquid to gas. In such a change heat is added to cause the vaporization of the liquid to form gases.
Vaporization is a phase change from liquid to gas. It is achieved by boiling a liquid to the boiling point. Evaporation is one of such form of vaporization attained when a liquid does not reach boiling point. The heat of vaporization is the amount of heat supplied to change a liquid to gas. Molecules of water becomes orderly as it freezes.Answer:
Hey again sissy how you doing?
Explanation:
does anyone know how to do this ??
Answer:
Look at your periodic table
Explanation:
It tells you everything like Potasium 1 and 1 ox and 1 hydrogen
NEED HELP NOW
Which item does not contain a noble gas?
neon sign
mp3 player
flash camera
helium balloon
Answer:
may be mp3 player......
Answer:
mp3 player
Explanation:
Neon sign contains Neon
Flash camera contains Xenon
Helium balloon contains Helium
What type of change is rotting of fruits?
Answer:
Chemical
Explanation:
The rotting of fruit is a chemical reaction. This is because when fruit spoils, an enzymatic reaction occurs. Because an enzymatic reaction causes molecules to change when rotting, rotting is a chemical reaction.
well,It is a chemical change because once an apple rots, it cannot go back to its original form as a new, clean, and fresh apple. and that is a chemical change. making it be different on a chemical level.
Answer:
chemical change
Explanation:
the reason for a fruit to rot is the enzyme reactions in it we can take that as a solid reason and on the other hand if it is a physical change we can reverse the change that means we should be able to take a rotten fruit and make it to its original position so that we can have it. but we can never do that so we can prove that rotting of fruits is a chemical change.
hope this helps
GUYS I REALLY NEED THIS ASAP!!!!!
Answer:
I don't think so
Explanation:
The equation doesn't look balanced
how many gram of sulphutic acid is present in 0.25 moles of sulphuric acid
Answer:
Mass = 24.52 g
Explanation:
Given data:
Mass of sulfuric acid = ?
Number of moles of sulfuric acid = 0.25 mol
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of sulfuric acid is 98.07 g/mol
Now we will put the values in given formula.
0.25 mol = mass/ 98.07 g/mol
Mass = 24.52 g
How many quantum numbers are same for 11th and 12th electrons of Magnesium?
Answer: hope this helps if so mark me brainlest
Explanation:
The four quantum numbers determine the state of the electron, and are
n
is the distance of the orbital from the nucleus (
1
,
2
,
3
,
4
etc),
l
is the shape of the orbital (
0
→
n
−
1
)
m
l
is the orientation of the orbital in space (
−
l
→
+
l
), and
m
s
is the spin of the electrons inside the orbital (
−
1
2
or
+
1
2
).
The electronic configuration for magnesium is
1
s
2
2
s
2
2
p
6
3
s
2
. The outermost electron is one in the
3
s
orbital, which means that
n
=
3
.
It also means that
l
=
0
, since
s
is basically shorthand for the orbital shape of
l
=
0
.
m
l
can range from
−
l
to
+
l
, but since
l
=
0
, then
m
l
must also be
0
.
Finally,
m
s
can be either one since there are two electrons in the
3
s
orbital and it doesn't really matter which spin you choose.
Putting all of these together, the final quantum numbers of a magnesium atom are
3
,
0
,
0
,
±
1
2
Which three phenomena occur during a double-slit experiment and support the wave model of light?
A. The light passes through the slit
B. Bright areas appear on the screen
C. Light bends around the edges of the slit
D. Dark areas appear on the screen
Answer:BC And D
Explanation:just did the quiz
The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen. Therefore, option B, C and D are correct.
What is double slit experiment ?The double-slit experiment, which was conducted to study the characteristics of light in the eighteenth century, has subsequently been found to illustrate the duality of photons as well as the ideas of superposition and quantum interference.
It implies that things we refer to as "particles," like electrons, in some ways mix the traits of both particles and waves. That is quantum physics' renowned wave-particle duality.
The three phenomena occur during a double-slit experiment and support the wave model of light is bright areas appear on the screen, light bends around the edges of the slit, dark areas appear on the screen.
Thus, option B, C and D are correct.
To learn more about the double slit experiment, follow the link;
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where would earth's be positioned during autumn if you lived in the southern hemisphere
Answer:
Autumn is one of the four basic seasons of the year in the temperate climate zone. It is characterized by moderate air temperatures with a decreasing daily average, and relatively high annual precipitation. The climate autumn is the period of the year in which the average daily air temperature ranges around 10° C.
Astronomical fall begins at the fall equinox and lasts until the winter solstice, which roughly means in the southern hemisphere between March 23 and June 22 (sometimes these dates are a day earlier or a day later, and in a leap year they may be additionally retracted one day). During astronomical autumn, the day time of the day is shorter than the night time, and moreover, with each successive day of the day it decreases and night increases.
Which has more mass, 2 moles neon or 2 moles nitrogen?
Answer:
two moles noen
so yeah that's my answerwhich compound is ionic?
1. CaBr2
2. NO2
3. CH4
4. NBr3
The morning temperature in a city is 41°F. If a sunny, mild day is forecast, which temperature is most likely for 2:00 p.m.?
Answer:
huh
Explanation:
What is the measure of how likely an atom is to react with another element
please help
1. State the relationship between atomic radius and metallic reactivity down group 2. Explain in terms of atomic structure why this relationship occurs. as atomic radius down group 2
Answer:
Atomic radius is directly proportional to Metallic reactivity in group 2.
Explanation:
Atomic radius is directly proportional to Metallic reactivity in group 2.
As we move down the group in group 2 which is called as the alkaline earth metals, the atomic number increases due to which the subshell increases. And the outermost shell's electron are less tightly held to the nucleus of the atom. Since the electrons are loosely held that means they can easily participate in reactions and that what makes it reactive down the 2nd group. Therefore alkaline earth metals with higher atomic number are more chemically reactive.
A student was assigned to take water samples from a lake near his home. He measured the pH of one of the water samples to be 6.0. Which of the following best describes this sample of water?
Highly acidic
Slightly acidic
Highly basic
Slightly basic
Answer: I'm not sure but I'm making a guess cause that's what I put in mines
Explanation: I think just THINK it's "B.- Slightly Acidic"
What is the differance between iron ii and iron iii?
Answer:
iron ii is reddish in color and is known as the mineral hematite. iron iii is black and is the mineral wustite.
Explanation:
How many moles are in 5.67x10^24 atoms of RbCl?
Answer:
9.42 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{5.67 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 9.418604...[/tex]
We have the final answer as
9.42 molesHope this helps you
