Answer:
A substance may undergo phase change from a solid to a gas or from a gas to a solid if the temperature it is exposed to is changed very quickly. If the temperature around a solid is raised very quickly, it can sublimate, or phase change from a solid to a gas without existing as a liquid.
Explanation:
Which of these questions can be answered using science?
What is the best career?
Does water exist on Venus?
Should the use of automobiles be stopped?
Which is the most interesting subject to study?
Answer:
B. Does water exist on Venus?
Explanation:
The first question, " which is the best career " isn't answered by science since it's subjective. different individuals will have different views, but I believe, whatever field a particular person like is the best field career. The third question is a " computer and technology " related question along with It being subjective while the forth
the question, just like the up to two questions, it's also subjective but the second question is in fact understandable by science.
Answer:
Does water exist on Venus?
Explanation:
This answer would be answered using science because venus is another planet and we don't have access to it, the only way we would know would be if scientists traveled there and explored it.
which acids are found In lemon and milk
Answer:
lemon- citric acid
milk- lactic acid
Answer:
lemon=citric and malic acids.
milk=Lactic Acid
Explanation:
Please helppp asapppp due soon ignore the answers i put in their wrong
PLEASE HELP
When an electron in a hydrogen atom drops from the fifth energy level to the second energy level 4.58 x 10-19 J of energy is released What is the frequency of the photon that is produced?
Answer:
e=hf conversion
hope it helps! stay safe as always!
One group of students is investigating the properties of the bar magnet shown below.
Bar magnet
The students' observations are listed below.
When an iron nail is taken near the North Pole (N) of the bar magnet, it is pulled towards the magnet.
When an iron nail is taken near the South Pole (S) of the bar magnet, it is pulled towards the magnet.
The experiment was repeated by several students using different bar magnets. Based on the investigations, which of these theories would the students most likely propose?
Group of answer choices
magnets attract iron nails
the poles of a magnet attract all materials
iron nails are attracted towards all materials
iron nails have the same properties as magnets
magnets attract everything with metal inside of it
Answer: magnets attract everything with metal inside of it
Explanation:
A solution containing 0.60 moles of sodium hydroxide is added to excess magnesium sulfate in solution. A white solid, magnesium hydroxide, is formed.
a) Write a balanced equation including the states of reactants and products.
b) write the name of the other product formed?
Explanation:
and then name of the other product will be sodium sulphate
how does the number of valence electrons change as you move to the right across the periodic table?
Answer:
The number of valence electrons goes up by one each time you move
Let’s Apply B
Directions: Identify the stages in the life cycle of a frog that is being described.
Give the correct answer that is being described.
NONSENSE = REPORT
PLEASE PA SAGOT !!!!!
Answer:
b a c a b
Explanation:
how can knowledge of percent composition help you as a consumer ? how can you promote responsible consumerism ?
Answer:
it is a nice question....my mind tells me that the first is it use me as a good vibes and can use to anything the second i will do my best too absorbe it.
Explanation:
Hope this help...
Will give 10 points.
Why does an atom have a neutral charge?
A It has equal numbers of electrons and protons.
B. The number of neutrons equals the number of protons and
electrons in the atom.
C. It has equal numbers of electrons and neutrons.
D. It has equal numbers of neutrons and protons.
Answer:
option A it has equal numbers of electrons and protons
Explanation:
electrons are negatively charged and protons are positively charged, so if the numbers of each are equal, then the atom will be neutral.
Answer:
A. it has equal numbers of electrons and protons
Explanation:
The overall charge of every atoms is neutral because the number of electrons and protons is the same. Protons are positively charged while electrons are negatively charged and so they cancel out.
What does it mean when the
frequency of a wave increases?
A. the amplitude increases
B. the amplitude decreases
C the wavelength becomes shorter
D. the wavelength becomes longer
Answer:
The answer is C
Can you put a brainliest for me
Explanation:
Answer:
the wavelength becomes shorter
Explanation:
frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.
HELP WILL MARK BRAINLIEST
If an electrically charged plastic bag is placed close to an uncharged cloth, what will happen?
The charge of the bag will change.
The charge of the cloth will change.
The plastic bag will attract the cloth.
The plastic bag will repel the cloth.
Answer:the plastic bag will attract the cloth
Explanation:
Answer:
c
Explanation:
hope this helps
Which of the following would
9 indicate a new substance has
been formed?
Bubbling and fizzing
occur.
Powder dissolves in
an unknown liquid
A beaker of
hydrochloric acid
evaporates after
several days
Solid iron is melted to
a liquid
Color YELLOW
Color ORANGE
Color PINK
Which one?
Answer:
Bubbling and fizzing are likely to occur when a new substance is formed. The other examples are simply changing to a different form of the same substance.
What role do plants play in reducing carbon dioxide in the atmosphere? How can plants play a role in combating climate change?
Please help!!? ASAP
Answer:
an indirect cooling effect.
Explanation:
they play that role by reducing water vapor in the heat .
what is a “ medium” in regards to waves ?
Give one example of how environmental factor could influence the way a gene is expressed.
Answer:
The presence of drugs or chemicals in an organisms environment can also influence gene expression in the orgains.
What is released when a bond between two atoms breaks?
A. Electrical energy
B. Chemical energy
C. Intermolecular force
D. Intramolecular force
What is a trial? please
Chandra wants to know how many moles are contained in 150. 0 g CCl4 (carbon tetrachloride). What quantity of CCl4 should she use to make this conversion? number of moles molecular mass molar mass mole ratio.
Answer:
Molar mass
Explanation:
The molar mass is the number of grams by which there's exactly one mole of one specific substance. So what you do is divide the grams by the molar mass to obtain the number of moles :).
Answer:
Yep Moler mass is the answer
Explanation:
Calculate the density of sulfur dioxide gas (SO2) at 147°C and 29.9 kPa.
The density of the gas is obtained as 0.55 g/L.
We can find the density of the gas using the relation;
PM = dRT
P = pressure of the gas
M = molar mass of the gas
d = density of the gas
R = gas constant
T = temperature
Now;
P = 29.9 kPa
R = 8.314 L·kPa mol·K.
T = 147°C + 273 = 420 K
d = ?
M = 64 g/mol
Substituting values;
d = PM/RT
d = 29.9 kPa × 64 g/mol/ 8.314 L·kPa mol-1K-1 420 K
d = 1913.6/3491.88
d = 0.55 g/L
Learn more about density: https://brainly.com/question/952755
3CaCl2 + Al2O3 —> 3CaO + 2AlCl
im not sure about the answer sorry in advance if it's wrong
calculate the volume in dm3 occupied by 26.4 g of carbon dioxide
[tex]\\ \sf\longmapsto Density=\dfrac{Mass}{Volume}[/tex]
[tex]\\ \sf\longmapsto Volume=\dfrac{Mass}{Density}[/tex]
[tex]\\ \sf\longmapsto Volume=\dfrac{0.0264}{1564}[/tex]
[tex]\\ \sf\longmapsto Volume=1.687m^3=1.69m^3[/tex]
1m^3=1000dm^3[tex]\\ \sf\longmapsto Volume=1.69(1000)=1690dm^3[/tex]
Knowing that the solubility of a salt at 80°C is 45g/100 g of H,O, calculate the mass of water required for dissolve 250 g of this salt at 80º C.
The mass of water required will be approximately [tex] \bf = 555.6\: g [/tex].
To solve this question, just make a simple rule of three between the amount of salt dissolved at 80ºC and the mass of water:[tex]\qquad[/tex] 45g of salt [tex] \sf \longrightarrow[/tex] 100g of H₂O
[tex]\qquad[/tex] 250g of salt [tex] \sf \longrightarrow[/tex] x g of H₂O
[tex]\qquad[/tex] [tex]\red{\twoheadrightarrow\bf45\times x = 250\times 100}[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf45x=25000[/tex]
[tex]\qquad[/tex] [tex]\twoheadrightarrow\sf x=\cancel{\dfrac{25000}{45}}[/tex]
[tex]\qquad[/tex] [tex]\red{\twoheadrightarrow\bf x = 555.6\:g}[/tex]
Therefore, knowing that the solubility of a salt at 80ºC is 45g/100g of water (H₂O), the mass of water needed to dissolve 250g of this salt at 80ºC will be [tex] \red{\bf = 555.6\: g }[/tex]__________________________________________________
XTRA POINTS 4 CHRISTMAS
What is an empirical formula?
Explanation:
a formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
Answer:
The answer is A
Explanation:
its is the chemical formula in which the subscripts are given in the smallest ratio
which particle diagram represents a sample of oxygen gas at stp
The diagram in image (4) in the image attached represents a sample of oxygen gas at stp.
Oxygen is a diatomic molecule, a diatomic molecule is a molecule that consists of only two atoms of the same element. In this case, the oxygen molecule consists of two oxygen atoms.
If we look at the diagram in the image attached very well, we will discover that the image in diagram (4) shows a molecule composed of two atoms of the same element and this fits exactly into the description of the oxygen molecule.
Learn more about diatomic molecules:
Particle diagram 4 represents the particles of oxygen at standard temperature and pressure.
A model of molecular (or diatomic) oxygen, which is made up of two oxygen atoms attached to each other through a covalent bond.
Dioxygen, also known as oxygen, is a naturally occurring molecule made up of two oxygen atoms that attach to each other with a strong covalent bond to form oxygen (dioxygen). Oxygen is sp3-hybridized, i.e. it has 4 sp3 hybrids. One of these hybrid orbitals overlaps with the s orbitals of hydrogen to create the O-h sigma bonds.
To learn more about oxygen refer to the link:
https://brainly.com/question/13905823
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The diagram in question is attached below.
Two samples of solids have similar reactivity with acids and similar densities. Their masses
and volumes, however, are not at all similar. Is it possible that these are the same
substance? (1 point)
O. No, it is not possible because they have different extensive properties.
O Yes, it is possible because they have similar intensive properties.
O Yes, it is possible because they have similar extensive properties.
O No, it is not possible because they have different intensive properties.
They may be the same substance even though they have different volumes and masses.
Intensive properties are the properties are characteristic a substance. Intensive properties are those properties of a substance that can be used to describe the substance.
We can see that the substances have similar reactivity and similar density. This means that they may be the same substance even though they have different volumes and masses.
The correct option is; "Yes, it is possible because they have similar intensive properties."
Learn more: https://brainly.com/question/17323212
Find the volume of hydrogen gas that reacts with 200 cm of nitrogen gas
measured at the same temperature and pressure.
N2 + 3H2(g) 2NH3(g)
Answer:
15 L
Explanation:
The important thing to remember about reactions that involve gases kept under the same conditions for pressure and temperature is that the mole ratios that exist between the gases are equivalent to volume ratios.
This can be proven using the ideal gas law equation for two gases kept at a temperature
T
and a pressure
P
.
P
⋅
V
1
=
n
1
⋅
R
⋅
T
→
the ideal gas law equation for the first gas
P
⋅
V
2
=
n
2
⋅
R
⋅
T
→
the ideal gas law equation for the second gas
Divided these two equations to get
P
⋅
V
1
P
⋅
V
2
=
n
1
⋅
R
⋅
T
n
2
⋅
R
⋅
T
This means that you have
n
1
n
2
=
V
1
V
2
→
the mole ratio is equivalent to the volume ratio
In your case, the balanced chemical equation looks like this
N
2(g]
+
3
H
2(g]
→
2
NH
3(g]
The problem tells you that this reaction takes place at constant temperature and pressure. You don't need to know the exact values, you just need to know that they are constant for all three chemical species.
You can thus say that since you have a
1
:
3
mole ratio between nitrogen gas and oxygen gas, you will also have a
1
:
3
the volume ratio between these two gases
n
N
2
n
H
2
=
V
N
2
V
H
2
=
1
3
The volume of hydrogen gas needed to react with that much nitrogen gas will thus be
5.0
L N
2
⋅
3
L H
2
1
L N
2
=
15 L H
2
In the conclusion to the snake mole lab, you have to convert 3.45 moles of (NH4)2S04 to
grams. What is the molar mass of (NH4)2504?
The chemical equation below shows the decomposition of ammonium nitrate (NH4NO3). NH4NO3 Right arrow. N2O 2H2O A chemist who is performing this reaction starts with 160. 1 g of NH4NO3. The molar mass of NH4NO3 is 80. 03 g/mol; the molar mass of water (H2O) is 18. 01 g/mol. What mass, in grams, of H2O is produced? 9. 01 18. 01 36. 03 72. 6.
The mass of water, H₂O produced from the reaction is 72.06 g
We'll begin by calculating the mass of NH₄NO₃ that reacted and the mass of H₂O produced from the balanced equation.
NH₄NO₃ —> N₂O + 2H₂O
Molar mass of NH₄NO₃ = 80.03 g/mol
Mass of NH₄NO₃ from the balanced equation = 1 × 80.03 = 80.03 g
Molar mass of H₂O = 18.01 g/mol
Mass of H₂O from the balanced equation = 2 × 18.01 = 36.02 g
From the balanced equation above,
80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O
Finally, we shall determine the mass of H₂O produced by the reaction of 160.1 g of NH₄NO₃.
From the balanced equation above,
80.03 g of NH₄NO₃ reacted to produce 36.02 g of H₂O.
Therefore,
160.1 g of NH₄NO₃ will react to produce = (160.1 × 36.02) / 80.03 = 72.06 g of H₂O.
Thus, the mass of water, H₂O produced from the reaction is 72.06 g
Learn more on stiochoimetry: https://brainly.com/question/15048051
why is oxygen more electronegative than hydrogen
Answer:
The attraction of the Oxygen for an electron as measured by the electronegativity of Oxygen is 3.5 which is higher than the electronegativity of Hydrogen at 2.2
Explanation: