Answer:
a.) A starch sample turns blue when introduced to iodine
Explanation:
A is a chemical change whereas the other answers would be physical changes.
The chemical property has been the turning of the iodine blue with starch introduction. Thus, option A is correct.
The substance properties can be differentiated as Physical properties and chemical properties. Physical properties can be defined as the properties that do not lead to the change in the chemical composition of the compound, For example, electrical conductivity, malleability, density, etc.
The properties of the compound that have been led to the change in the chemical composition of the compound have been termed chemical properties. For example. burning, reduction, etc.
Since the starch sample has been reacted with iodine there has been a chemical change that leads to the product of blue color. Thus, the starch turning iodine blue has been the chemical property. Thus, option A is correct.
For more information about the chemical properties, refer to the link:
https://brainly.com/question/5186976
Use the graph to determine the instantaneous speed at 2 seconds.
What is the average speed over the entire trip?
Answer:
The instantaneous speed at 2 seconds =
3 m/s
The average speed over the entire trip is
2 m/s
Explanation:
Answer above is wrong and doesn't state anything about the answer, so this is the correct answer hope this helped! :)
Answer:
1.) 3 m/s 2.) 2 m/s
Explanation:
I hope this helps!!
What is the minimum number of kiloJoules needed to change 40.0 grams of water at 100C to steam at the same temperature and pressure
Answer:
90.4Kg
Explanation:
The energy required= latent heat of vaporization
Latent heat of vaporization of water= 2260 KJ/Kg
Mass of water = 0.04 Kg
Heat required= 0.04Kg× 2260 KJ/Kg
Heat required= 90.4Kg
Answer: The minimum number of kilo Joules needed is 90.4KJ.
Explanation:
The energy required= latent heat of vaporization.
Latent heat of vaporization of water= 2260 KJ/Kg
Mass of water = 0.04 Kg
Heat required= 0.04Kg× 2260 KJ/Kg
Heat required= 90.4KJ.
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i need to know what occupied vs full means for chemistry
A heat energy of 645 J is applied to a sample of glass with a mass of 28.4 g. Its temperature increases from –11.6 °C to 15.5 °C. Calculate the specific heat of glass.
Answer:838J/kg/K
Explanation:
use : Q= mS◇ T
What happens when you put an ice-pop outside? This is for the people who don’t know
Answer:
It melts
Explanation:
Answer:
It melts?
Explanation:
Please help I’ll give you guys brainiest!
Thank youuuuuuu :))
Answer:
I think it's unbalanced
(I'm so sorry if it's wrong)
Hope this helps!
Answer:
unbalanced
Explanation:
what is the octet rule?
Answer:
the octet rule is a chemical rule of thumb that reflects the observation that main group elements and bonds and such a way that each has a electrons in its valence shell giving the same electronic configuration as noble gas
what are the three things transported by global ocean circulation?
Answer:
The produce large circular currents in all the ocean basins. Currents, The North Equatorial Current, the Gulf Stream, the North Atlantic Current, and the Canary Current.
Explanation:
When two continental plates of similar
densities collide,
A. they remain level since densities in both plates are equal.
B. they both push back down into the mantle
C. one plate rides over the other one and forms a trench
D.they buckle upward and form mountains
Answer:
D. They buckle upward and form mountains.
Explanation:
When two plates (either oceanic or terrestrial) converge and they are of similar density then they will crash into each other and form mountains. A great example of this is when India crashed into the Asian continent and the Himalayas were formed.
A local plant nursery uses large sprinklers to water the plants twice a day. The water contains phosphorus, which is a fertilizer that helps plants grow. Some of the water becomes runoff and ends up in nearby streams and lakes. This is an example of which type of short-term human-induced environmental change? eutrophication
Answer:
It’s eutrophication
Explanation:
There is no way it can be DEFORESTATION or NON SUSTAINABLE SPECIES
Non sustainable harvesting has something to do with animals and eutrophication means adding excessive nutrients
Answer:A.
Explanation: I took the test, sorry if this is incorrect
If molten sodium chloride is split by electrolysis, which reaction occurs at the anode?
2Cl2 (g) →2Cl− (l) + 2e−
2Cl− (l) →Cl2 (g) + 2e−
2Na (l) →2Na+ (l) + 2e−
2Na+ (l) + 2e−→2Na (l)
Answer: [tex]2Cl^-(l)\rightarrow 2e^-+Cl_2(g)[/tex]
Explanation:
Electrolysis of a subastance is breaking it into its constituents by the action of electrical current.
In the electrolysis of molten sodium chloride, sodium metal is produced at the cathode which is a negative electrode and chlorine gas produces as the anode which is a positive electrode.
[tex]2NaCl(l)\rightarrow 2Na^++2Cl^-[/tex]
At anode : [tex]2Cl^-(l)\rightarrow 2e^-+Cl_2(g)[/tex]
At cathode : [tex]2Na^+(l)+2e^-\rightarrow 2Na(l)[/tex]
2Cl- (l) → Cl2 (g) + 2e-
What very specific property of mineral calcite allows geologists to quickly identify it in a mixture of other colorless minerals
Order the following elements from Highest to Lowest Electronegativity.
K, Sc, Ca, Zn, Br
Sc, K, Br, Zn, Ca
OK, Ca, Sc, Zn, Br
O Br, Zn, Sc, Ca, K
Ca, Zn, Br, K, SC
Answer:
O, Ca, Zn, Br
Sc, K, Br,
Explanation:
The correct order of the chemical elements from highest to lowest electronegativity is: C. Br, Zn, Sc, Ca, K.
Electronegativity refers to a measure of the ability of an atom of a chemical element to attract any shared pair of electrons.
Generally, the electronegativity of a chemical element typically increases across the period from left to right.
In Chemistry, the electronegativity of some of the chemical element are:
Bromine (Br) = 2.96Calcium (Ca) = 1.0Zinc (Zn) = 1.65Potassium (k) = 0.82Scandium (Sc) = 1.36Hence, the order of the chemical elements from highest to lowest electronegativity is:
1. Bromine (Br) = 2.96
2. Zinc (Zn) = 1.65
3. Scandium (Sc) = 1.36
4. Calcium (Ca) = 1.0
5. Potassium (k) = 0.82
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Balance equation PLEASSEEE HELPPP MEEE
Answer:
2AgNO₃ + MgCl₂ ⇒ 2AgCl + Mg(NO₃)₂
Explanation:
Match both sides of the equation. practice practice
Is honors high school chemistry hard? Is it hard mathematically? please answer ASAP i have to put in my courses for next year.
Explanation:
yes its hard if you don't pay attention.
Yes, the math is harder but chemistry is not it's really fun the math does get harder tho.
pls help question 2 ill attach a picture
Answer:
X 154
Check solution in explanation
Explanation:
Average atomic mass = ( mass 1× abudance) + ( mass 2× abudance)+ ( mass 3× abudance) / 100
(149×13.8)+(152×44.9) +(154×41.3)/100
2056.2 + 6824.8 + 6360.2/100
=152.412
what is the value of log1.004?
Answer:
−0.60205999
Explanation:
EMERGENCY!!! Can someone tell me the answer plz plz I’ll give you brainlist and points plz This is my final test No wrong answers
Answer:
A. the valence electrons
Explanation:
Answer:
The valence electrons
Explanation:
The valence electrons determine an element's properties because chemical properties of each element are determined by the element's electronic configuration and PARTICULARLY by its outermost valence electrons. I hope it helps!
~Good luck
How many oxygen atoms are there in
Fe203?
Answer:3 oxygen atoms.
Explanation: Each formula unit of Fe2O3 contains 2 atoms of iron and 3 atoms of oxygen (technically they are ions, but that doesn't matter).
How do the physical and chemical properties of wood contribute to the function of the synthetic products made of wood?
Wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time. The rigidity of wood is affected by temperature.
What is wood?Wood is one of the most common and useful natural materials. It is the main tissue that supports and conducts nutrients in trees and other plants. Wood comes in a variety of colours & grain patterns and is produced by numerous botanical species, comprising both gymnosperms & angiosperms.
Its wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time. The rigidity of wood is affected by temperature. Unfavourable weather and unexpected temperatures will have an impact on the wood's strength. Among its attributes are mechanical, chemical, and physical qualities.
Therefore, wood's tensile strength is reduced. Another risk factor for the strength of the wood is the loading time.
To know more about wood, here:
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* The cost of table salt and table sugar is Rs 15 per kg.
and Rs 69 per kg respectively calculate their cost per mole?
Cost per mole
Table salt : Rs 0.878
Table sugar : Rs 23.63
Further explanationGiven
Cost table salt (NaCl) = 15/kg
Cost table sugar(sucrose-C12H22O11) = 69/kg
Required
cost per mole
Solution
mol of 1 kg Table salt(NaCl ,MW= 58.5 g/mol) :
[tex]\tt mol=\dfrac{1000~g}{58.5}=17.09~mol=Rs~15\rightarrow 1~mol=Rs~0.878[/tex]
mol of 1 kg Table sugar(C12H22O11 ,MW= 342 g/mol) :
[tex]\tt mol=\dfrac{1000}{342}=2.92~mol=Rs~69\rightarrow 1~mol=Rs~23.63[/tex]
wich type of matter is always made up of only one kind of atom
Answer:
what is this for?
Explanation:
Answer:
Elements
Explanation:
"Elements are substances, forms of matter and gasses that are made up of only one type of atom."
Panico. (2012, September). The Atomic Model and Matter. Retrieved December 15, 2020, from https://odysseyk12.org/hs/teachers/panico/pdf/atoms/atoms.html
Is radium usually considered as part of the alkaline earth category in terms of chemistry?
Explanation:
Radium (atomic number 88) has similar properties to barium and is also in the Group 2 category. However, radium is a radioactive element and is generally under the category of radioisotopes in addition to being an alkaline earth metal, because it is not a stable element.
"Indicate in each whether the following electron configurations correspond to an atom in its ground state, excited state, or is impossible."
a. [tex]{1s}^{2} {2s}^{2} {2p}^{4} [/tex]
b. [tex] {1s}^{2} {2s}^{2} {2p}^{3} {2d}^{1} [/tex]
c. [tex] {1s}^{2} {2s}^{2} {2p}^{3}{3s}^{1} [/tex]
d. [tex] {1s}^{2} {2s}^{1} {2p}^{2} [/tex]
e. [tex] {1s}^{2} {2s}^{2} {2p}^{1} [/tex]
f. [tex] {1s}^{2} {2s}^{3} [/tex]
Please, I really need help. I don't know what to do...
Answer:
Explanation:
Firstly, let's define what ground and excited state electronic configuration.
Ground state electronic configuration is when the electrons of the atom are in there lowest possible energy level while excited state electronic configuration is when electron(s) have moved to a higher energy level. Examples of these are provided in the options
a. 1s²2s²2p⁴ - This is a ground state electronic configuration (of oxygen) because the electrons are in there lowest possible energy level.
b. This option is not displaying (it is displaying something like an image that isn't loading)
c. 1s²2s²2p³3s¹ - We can see from this that an electron jumped from 2p energy level to 3s (p energy level ought to be completely filled with 6 electrons before another electron moves to the next energy level) meaning the electron is in it's excited state thus this is an excited state electronic configuration (of oxygen).
d. 1s²2s¹2p² - We can see from this also that an electron jumped from the 2s energy level to the 2p energy level (making it 2p² instead of 2p¹ in the ground state). The 2s energy level should ordinarily have 2 electrons. Thus, this is an excited state electronic configuration (of boron).
e. 1s²2s²sp¹ - This is a ground state electronic configuration (of boron) since all the electrons are in there lowest possible energy level.
f. 1s²2s³ - This configuration is impossible because the s energy level should only contain a maximum of 2 electrons, thus impossible to have 3 electrons in the s energy level
A student heats a 2.5 g sample of calcium carbonate in a test tube. What mass of calcium oxide remains in the test tube when the reaction is complete?
CaCO3(s) = CaO(s) + CO2(g)
Select one:
a. 1.4 g CaO
b. 2.1 g CaO
c. 2.5 g CaO
d. 1.0 g CaO
Answer:
1.4 g CaO
Explanation:
Given data:
Mass of calcium carbonate = 2.5 g
Mass of Cao remain in tube = ?
Solution:
Chemical equation:
CaCO₃ → CaO + CO₂
Number of moles of CaO:
Number of moles = mass/molar mass
Number of moles = 2.5 g/ 100 g/mol
Number of moles = 0.025 mol
now we will compare the moles of CaO with CaCO₃.
CaCO₃ : CaO
1 : 1
0.025 : 0.025
Mass of CaO:
Mass = number of moles × molar mass
Mass = 0.025 mol × 56 g/mol
Mass = 1.4 g
Answer:
1.4g CaO
Explanation:
Did the exam and got it right. Hope this helps
(oh no)
What is the mass of silicon when there are 1.8 x 10^21 atoms of silicon?
Answer:
Mass = 0.084 g
Explanation:
Given data:
Mass of silicon = ?
Number of atoms of silicon = 1.8 × 10²¹ atom
Solution:
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
1.8 × 10²¹ atom × 1 mole / 6.022 × 10²³ atoms
0.299× 10⁻² mol
0.00299 mol
Mass of silicon:
Mass = number of moles × molar mass
Mass = 0.00299 mol × 28.1 g/mol
Mass = 0.084 g
Calculate the number of protons and neutrons for ²⁴Mg and 88Sr.
Answer:
12 protons and 12 neutrons are present in Mg and
38 protons and 50 neutrons are present in Sr
Explanation:
Answer:
For ²⁴Mg
1. Proton number = 12
2. Neutron number = 12
For ⁸⁸Sr:
1. Proton number = 38
2. Neutron number = 50
Explanation:
For ²⁴Mg:
1. Determination of the number of proton.
The atomic number of an element is simply defined as the number protons in the atom of the element. The atomic number of ²⁴Mg is 12 since no two elements have the same atomic number.
Atomic number = 12
Proton number = Atomic number
Proton number = 12
2. Determination of the Neutron number.
Mass number = 24
Proton number = 12
Neutron number =?
Mass number = Proton + Neutron
24 = 12 + Neutron
Collect like terms
Neutron = 24 – 12
Neutron number = 12
For ⁸⁸Sr:
1. Determination of the number of proton.
The atomic number of ⁸⁸Sr is 38.
Atomic number = 38
Proton number = Atomic number
Proton number = 38
2. Determination of the Neutron number.
Mass number = 88
Proton number = 38
Neutron number =?
Mass number = Proton + Neutron
88 = 38 + Neutron
Collect like terms
Neutron = 88 – 38
Neutron number = 50
soap making ingredients list (not harmful chemicals)
20 oz. coconut oil
10 oz. olive oil
9 oz. distilled water
essential oils
colorants (optional)
dried herbs or flowers (optional)
soap base accordingly
The Guarantee Clause gives the legislature the power to make all necessary and proper laws.
Answer:
True
Explanation:
Answer:
True ;)
Explanation:
is the lorax story relevant today society?
Answer:
well i would say yes because how the factory made the air bad and how they all were fighting just about a tree
Explanation:
Answer: LOL XD no because of CO/VID
Explanation: BRAINLIEST PLS LOL