The question is incomplete, the complete question is;
Theresa creates an experiment where she mixes two red-colored substances together in a container and observes the solution slowly changing from red to blue for the next eight minutes. The solution becomes completely blue after eight minutes. What does this represent about the type of change happening in the container? A chemical change started immediately and finished at eight minutes. A non-chemical change started immediately and finished at eight minutes. A chemical change occurred at four minutes. A non-chemical change occurred at four minutes.
Answer:
A chemical change started immediately and finished at eight minutes.
Explanation:
A chemical change is one in which a new substance is formed. One of the indicators that a chemical change has occurred is the change in the color of the system from red to blue.
The question clearly stated that the change occurred gradually. This means that the reaction must have started immediately the substances were mixed and went on to conclusion after eight minutes when the complete blue color appears.
How do I find the formula for Phosphorus Tetroxide
69. Sequencing Arrange these hydrates in order of
increasing percent water content: MgSO;-7H.O.
Ba(OH)2-8H.O. COC1, 6H2O.
In order of increasing percent water content:CoCl₂.6H₂O, Ba(OH)₂.8H₂O, MgSO₄.7H₂O
Further explanation[tex]\tt \%element=\dfrac{Ar~element}{MW~compound}\times 100\%[/tex]
CoCl₂.6H₂O.MW=237.90 g/mol
6H₂O MW = 6.18=108 g/mol
[tex]\tt \%H_2O=\dfrac{108}{237.9}\times 100\%=45.4\%[/tex]
MgSO₄.7H₂O.MW=246.48 g/mol
MW 7H₂O = 7.18=126 g/mol
[tex]\tt \%H_2O=\dfrac{126}{246.48}\times 100\%=51.1\%[/tex]
Ba(OH)₂.8H₂O MW=315.48 g/mol
MW 8H₂O = 8.18=144 g/mol
[tex]\tt \%H_2O=\dfrac{144}{315.48}\times 100\%=45.6\%[/tex]
1. Calculate the amount of heat required for 25.0 grams of water tochange from 10 degrees Celsius to 30 degrees Celsius.
2. 50.0 grams of water at 100 degrees Celsius evaporated to water vapor 2 points
at 100 degrees Celsius. Calculate the amount of heat required for this
conversion.
3. A student measured 15.0 grams of ice in a beaker. The beaker was then
placed on a hot plate where it was heated uniformly for a certain amount
of time. During the melting process of the ice, the student noted that the
temperature was at 0 degree Celsius. When all the ice converted to water,
the final temperature was also at 0 degree Celsius. How much heat was
used to melt the ice?
4. If 5.0 grams of water was cooled from 50 degrees Celsius to 40
degrees Celsius, then calculate the amount of heat released by the water.
5. A certain amount of water used exactly 84.0 Joules of heat energy to
change from 25.0 degrees Celsius to 35 degrees Celsius. How many
grams of water was used?
Please help me
Answer:
Explanation:
1 )
amount of heat required = mass x specific heat x rise in temperature
= 25 x 4.2 x 20 = 2100 J .
2 )
Amount of heat required
= mass x latent heat of vaporisation
= 50 x 2260 = 113000 J .
3 )
Amount of heat required in melting the ice
= mass x latent heat of fusion
= 15 x 336 = 5040 J
4)
heat released in cooling water
= mass x specific heat x fall in temperature
= 5 x 4.2 x 10
= 210 J
5 )
amount of heat required = mass x specific heat x rise in temperature
84 = mass x 4.2 x 10
mass = 2 grams .
a cube has a length of 1.02 cm and a mass of .001012 kg what is its density
Answer:
d = 9.5× 10⁻⁴ Kg/cm³
Explanation:
Given data:
Length of cube = 1.02 cm
Mass of cube = 0.001012 Kg
Density of cube = ?
Solution:
The length , height and width of cube is always same. Thus the volume of cube is,
Volume = length × height× width
Volume = 1.02 cm × 1.02 cm × 1.02 cm
Volume = 1.06 cm³
Density of cube:
d = 0.001012 Kg /1.06 cm³
d = 9.5× 10⁻⁴ Kg/cm³
Which of the following is the final stage of development before birth?
a
zygote
b
embryo
c
uterus
d
fetus
Answer:
D. Fetus
Explanation:
If a compound begins with a metal, it most likely is a _______ compound
metallic
molecular
covalent
ionic
Answer:
A
Explanation:
If a compound begins with metal, it is most likely to be a metallic compound. Thus, option A is correct.
The metallic compound has been formed when the metal has been bonded with a metal or more than 1 metal by the ionic or covalent interaction.
The ionic interactions result in between the metal and non-metal or between two metals, and the covalent interactions have been found in the nonmetals.
The molecular compound has been the one that has been formed a molecule. All the compounds are molecular compounds.
Thus, if it starts with metal, it has been most likely to form a metallic compound. Thus, option A is correct.
For more information about the compounds with metal, refer to the link:
https://brainly.com/question/18665430
How many elements are in H
a) 3
b) 2
c) 1
d) 5
Answer: C (1)
Explanation:
H is only the element hydrogen.
A 2.00 L pocket of air at sea level has a pressure of 99.9 atm. What is the
pressure if the pocket of air rises and expands to 8.0 L? *
0.04 atm
O
400 atm
25 atm
52 atm
Answer:
The answer is 25 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{2 \times 99.9}{8} = \frac{199.8}{8} \\ = 24.975[/tex]
We have the final answer as
25 atmHope this helps you
Answer:
25 atm
Explanation:
Hope I helped
PLEASE HELP!
How many moles of NaOH would produce 10 moles of water in this reaction?
2NaOH + H2SO4 → Na2SO4 + 2H20
Answer:
The correct answer is 10
1. What is the name of the ion formed from the sulfur atom?
Sulfuride
Sulfurous
Sulfur
Sulfide
2. Which of the following elements does not form an ion with a charge of +1
A:Sodium
B:Fluoride
C;Potassium
D:Hydrogen
3. The chemical properties of an element are largely determined by____
A:The number of valence electrons they have
B:The number of total protons the element has
C:The number of total ions the element has
D:The number of total electrons the element has
5. How does magnesium obey the octet rule when reacting to form compounds?
A. It gives up electrons
B. Magnesium does not obey the octet rule.
C. It gains electrons
D. It does not change its number of electrons
6. How many electrons does strontium have to give up to achieve a noble gas electron configuration?
0
1
2
3
Answer:
1 sulfide
2 Fluoride
3 A
5 A
6 2
How does the suns energy contribute to the movement of water in the water cycle?
Answer:
The sun is what makes the water cycle work. ... Heat causes liquid and frozen water to evaporate into water vapor gas, which rises high in the sky to form clouds... clouds that move over the globe and drop rain and snow. This process is a large part of the water cycle.
Explanation:
Answer it doesn't contribute
Explanation: it doesn't contribute
The spontaneous disintegration (breaking down) of a nucleus into slightly
lighter and more stable nucleus describes
A.nuclear fusion
B. nuclear fission
C. radioactive decay
D. nuclear radiation
Answer:
Radioactive Decay
Explanation:
science againnnnnn helppp!!!!!
Answer: this is not my own words :)
Learn how factors, such as exposure to the atmosphere, the composition of rock and climate affect the rate of weathering. Weathering is the mechanical or chemical process by which rocks are broken down. The weathering that happens to rocks can be understood by relating it to the digestion of a chocolate chip cookie
One of the factors that affects the rate of weathering is exposure to the atmosphere. ... Another factor that affects the rate of weathering is the composition of rock. Rocks are composed of minerals, which are solid substances found within rocks that have their own distinct chemical composition.
The reactants in a chemical equation have 3 carbon atoms, 6 oxygen atoms, and 4 hydrogen atoms. In order to follow the conservation of matter, the products of the chemical equation will have
Answer:
The same amount of atoms (3 carbon atoms, 6 oxygen atoms, and 4 hydrogen atoms).
Explanation:
According to the law of conservation of mass, when a chemical reaction takes place there is no synthesis or degradation of matter, that is, matter can be neither created nor destroyed. It can only be transformed.
Therefore, in a chemical reaction the atoms are conserved. That means that the elements that in definite proportions are forming a compound, will reorganize to form new compounds, and the amount and type of atoms of the products will be the same as the reactants.
In summary, if the reactants in a chemical equation have 3 carbon atoms, 6 oxygen atoms, and 4 hydrogen atoms, the products of the chemical equation will have 3 carbon atoms, 6 oxygen atoms, and 4 hydrogen atoms as well.
Which process creates new cells from existing cells?
A. Cell division
B.Cell limitation
C.Cell addition
D.No answer text provided.
Answer:
the answer is cell division
Explanation:
cell division is the process by which a present cell divides into two or more daughter cells.
the process can also be called cell cycle
heyyyyyyy......................
Answer:
helllllooooooo hi how is life
Answer:
hiiii
Explanation:
can someone help me with this
i need help with my assignment asap
How do limestones that begins as a coral be found on land?
Answer:The limestone began to form millions of years ago, when the land was under the ocean. The rock developed from shells of tiny organisms that float in the ocean. ... However, in the case of reefs, the limestone is produced directly as coral organisms build their skeletons one on top of another.
HURRY DONT HAVE MUCH TIME LEFT. Vegetarians do not eat animal products but rather derive their protein from plant sources. Which type of protein do vegetarian food sources lack?
Answer:
b12 and d3
Explanation:
Most plastics are made from oil or natural gas. One step in making plastics from these resources is called cracking. Cracking is a process that breaks down bigger molecules into smaller ones. In one cracking reaction, ethane breaks down to become ethylene and hydrogen. During this process, thermal energy is absorbed from the surroundings and converted to chemical energy.
True or False
Answer:
true im pretty sure
Explanation:
______ have trees with cones.
A. temperate rainforests
B. boreal forests
C. tropical rainforests
D. temperate deciduous forests
Answer:
D.
Explanation:
Chemical and physical element properties are determined by their valence electrons. How do you describe metals with only one valence
electron?
A .highly reactive
B. poor conductors of electricity
C. reactive with other metals
D. likely to gain more electrons
Answer:
B
Explanation:
Chemical and physical element properties are determined by their valence electrons metals with only one valence electron are poor conductors of electricity. Option B is correct.
What are valance electrons?Valence electrons are the electrons present at the valance shell or orbit of the atom and always take part in the chemical reaction or reaction with other metals and can conduct electricity.
If the atom contains only one valance electron in the outermost shell or valance shell then it cannot conduct the electricity properly due to the fewer number of electrons.
Therefore, Option B is correct. Chemical and physical element properties are determined by their valence electrons metals with only one valence electron are poor conductors of electricity.
Learn more about valance electrons, here:
https://brainly.com/question/866518
#SPJ2
HELP ASAP
Describe the function of Cytokinesis in the cell cycle.
describe the Rutherford model... and and what are its limitation...
going offline forever ✌️
Answer:
Limitations of Rutherford Atomic Model
Although the Rutherford atomic model was based on experimental observations it failed to explain certain things. Rutherford proposed that the electrons revolve around the nucleus in fixed paths called orbits. ... Ultimately the electrons would collapse in the nucleus.
I need to find the orbit notation
1. Ne - 1s 2s 2p 3s 3p 4s 3d 4p 5s
Answer:
1s*2 2s*2 2p*6
Explanation:
atomic number of neon is 10 so the s-shell contains 2 electron and p-shell contains 6
asthenosphere
OA.
oceanic continental convergent boundary
B.
oceanic-oceanic convergent boundary
O c.
divergent boundary
D.
transform boundary
Awnser I know if ur right I’ll mark brainlesst
Answer:C
Explanation:The samples are composed of different proportions of copper and zinc
What type of a solution is 60g NaNO3 at 40°C in
100g H202
Answer:
Explanation:
Saturated solution
Which of the following structures are found in eukaryotes, but not prokaryotes?
A) Cytosol
B) Cilia
C) Golgi body
Answer:
B
Explanation:
Select all that apply. Using your periodic table of the elements which chemical symbols indicate an element?
Question 5 options:
O
I
i
Ca
Answer:
O, I, Ca
Explanation: