Answer:
Light receptors within the eye transmit messages to the brain, which produces the familiar sensations of color. Newton observed that color is not inherent in objects. Rather, the surface of an object reflects some colors and absorbs all the others. We perceive only the reflected colors.
State the types of change that take place in each of the following
a)Burning a piece of charcoal .........
b) Heating copper (ii) carbonate strongly....
c) Heating Zinc oxide strongly
In a experiment to determine the percentage o
40cm3 of 0.51
Answer:
Chemical changes
Explanation:
a)Burning a piece of charcoal - chemical change
b) Heating copper (ii) carbonate strongly - chemical change
c) Heating Zinc oxide strongly - chemical change
The given types of reaction indicates chemical changes. A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible and hence, it is a permanent procedure.
Burning of charcoal produces a new kind of produces in the combustion process.
Both heating of copper(ii)carbonate strongly and zinc oxide will lead to a decomposition reaction in which new compounds are formed.
why is the moisture of cirrus clouds mostly in the solid state
Answer:
Wind is the horizontal movement of air, transporting energy transferred from the earth's surface as sensible and latent heat. Sensible heat is transferred by the processes of conduction and convection. Conduction transfers energy within a substance, and convection transfers energy through the vertical movement of the heated substance. Latent heat is the transfer of energy by transforming the substance itself. As you recall, water has the ability to exist as liquid, gas or solid. The transformation from liquid to gas is called evaporation; the reverse process, from gas to liquid, is called condensation; from liquid to solid is known as solidification (freezing); and from solid to liquid, fusion (melting). Water can also be transformed directly from solid to gas (sublimation), or the reverse, through a process called deposition. We will see these various processes in the formation of clouds.
Explanation:
if I did not give answer then i hope i at least helped!
Which of the following statements is one of the postulates in Dalton´s theory?
Answer:
spanish conquistadors, who were primarily poor nobles from the impoverished west and south of Spain, were able to conquer the huge empires of the New World with the help of superior military technology, disease (which weakened indigenous resistance), and military tactics including surprise attacks and powerful and there were no strangers to love and they knew the rules and so did i they just wanted to tell people how the were feeling and they wanted someone to understand so they were never gonna give you up and they were never gonna let them down and they were never gonna turn around and hurt other people in the army they were never gonna make the soldiers cry and they never were going to say goodbye but the years stop comming and they dont stop comming head to the rules gotta keep the groud running but Remember those walls I built Well, baby, they're tumbling down And they didn't even put up a fight They didn't even make a sound I found a way to let you win But I never really had a doubt Standing in the light of your halo I got my angel now It's like I've been awakened Every rule I had you breaking It's the risk that I'm taking I ain't never gonna shut you out Everywhere I'm looking now I'm surrounded by your embrace BabPatrician. Patricians were considered the upper-class in early Roman society. They controlled the best land and made up the majority of the Roman senate.y, I can see your halo You know you're my saving grace You're everything I need and morei t's written all over your face Baby, I can feel your halo Pray it won't fade away Hit me like a ray of sun Burning through my darkest night You're the only one that I want Think I'm addicted to your light swore I'd never fall again But this don't even feel like falling Gravity can't forget To pull me back to the ground again PatricPatrician. Patricians were considered the upper-class in early Roman society. They controlled the best land and made up the majority of the Roman senate.ian. Patricians were considered the upper-class in early Roman society. They controlled the best land and made up the majority of the Roman senate.
Explanation:
Answer:
All elements are composed of Atoms.
(if you have the same question with a different set of answers read the notes I left down bellow)
Explanation:
Dalton’s Atomic Theory - All elements are composed of atoms, atoms of the same element are identical, atoms of different elements can chemically combine to in whole number ratios, chemical reactions occur when atoms are separated, joined or combined.
(those are from my notes that I took for my chem module. I really hope this helps, also I took the test and this is the right answer :)) )
Please help me with these questions... please..
Imagine you are a scientist who has just discovered a new element. The element has an atomic number of 113, and it has three elections in the outer energy level of each atom.
Which element would have properties most similar to the new element?
Group of answer choices
A.boron
B.carbon
C.hydrogen
D.beryllium
What would you name this new element?
Answer:
3 valence electrons
The element with the atomic number 113 would fall in the 13th column of the periodic table Group IIIA. This group has an electron configuration that would end as p1 , meaning there would be 3 valence electrons. The valence electrons are the electrons found in the highest energy level in the s and p orbital.
Explanation:
Nihonium has to be the #113 element of the periodic table
A. is the correct answer because Boron has 3 electrons too,
All elements in Group 13 have three electrons in their outermost energy level. The two most popular elements in this group are Boron and Aluminum.
Boron element would have properties most similar to the new element. Therefore, option (A) is correct.
Why do the elements of same group have similar chemical behavior?The chemical properties of elements depend on the number of valence electrons in their valence shell. Elements in the same group in the modern periodic table have the same number of valence electrons. Therefore, chemical elements situated in same group of the modern periodic table have similar chemical behavior.
The chemical elements having an identical outer electronic configuration in their atoms are placed in the same group of the periodic table. These valence electrons of an element are responsible chemical behavior and reactivities of the elements.
Therefore, both Boron and a new element with atomic number 113 have three electrons in their valence shells. So they belong to the same group and will have similar chemical properties.
Learn more about elements with similar chemical behavior, here:
brainly.com/question/5364617
#SPJ2
Calculate the speed of a dog running through a field if he is covering 23.7 meters in 54 seconds.
Explanation:
speed = distance/time
= 23.7/54 m/s
= 0.44 m/s
speed of a dog running through a field = 0.44 m/s
What is the coefficient for iron when the equation below is balanced?
Fe + Cl2 = FeCl3
A) 1
B) 4
C) 3
D) 2
The coefficient for iron (Fe) in the balanced chemical equation is 3.
How does the balance chemicals equation look like?Lets first analyse the chemical equation presented to us which is Fe + Cl2 = FeCl3
The number of iron atoms on each sides is 1. However, the number of Cl atoms on the left and right sides is 2 and 3, respectively.
To balance the equation, we need to make sure tht the same number of atoms of each element is present on both sides of the equation.
To balance the number of Cl atoms, we need to add a coefficient of 2 to FeCl3 which becomes Fe + Cl2 → 2FeCl3
For us to o balance the number of Fe atoms, we need to add a coefficient of 3 to Fe. It becomes 3Fe + Cl2 → 2FeCl3
Find more exercises on chemical equation;
https://brainly.com/question/30087623
#SPJ1
Which of the following is the correct name for Cr203?
A. Chromium trjoxide
B. Chromium(III) oxide
O C. Chromium(II) oxide
D. Dichromium trioxide
Answer:
The correct name is Chromium(iii) oxide
A photon of light possesses 5 x 10^-19 J of energy. Calculate its frequency
Answer:
The frequency of photon is 0.75×10¹⁵ s⁻¹.
Explanation:
Given data:
Energy of photon = 5×10⁻¹⁹ J
Frequency of photon = ?
Solution:
Formula;
E = hf
h = planck's constant = 6.63×10⁻³⁴ Js
5×10⁻¹⁹ J = 6.63×10⁻³⁴ Js ×f
f = 5×10⁻¹⁹ J / 6.63×10⁻³⁴ Js
f = 0.75×10¹⁵ s⁻¹
The frequency of photon is 0.75×10¹⁵ s⁻¹.
Pb(NO3)2(aq) + KCl(aq) ---- → KNO3(aq) + PbC12(s)
Predict the Products and then Balance: H2CO3 =
A) H2CO3 = H2O + CO2
B) H2CO3 = H2 + CO2
Answer:
(A) H2CO3 = H20 + CO2
Explanation:
Carbonic acid is formed from carbon dioxide and water so its equation will be
H2CO3 → H2O + CO2
The equation is balanced as same no of atoms of each specie is present both sides
Why a steel ball sinks in water but floats on mercury
Answer:
Mercury is a thick substance and able to sustain and hold anything with any metallics with metal, such as with water it is not working as water is a thin substance and not able to hold heavy things
Explanation:
2. Many rings and other jewelry are made of gold. Gold can be found on the periodic table as Au. It has a melting point of 1337K and a boiling point of 3234K. What is gold classified as?
A. An element B. A Compound
C. A Homogenous Mixture D. A Heterogeneous Mixture
A. An element.
As long as it's on the periodic table, it's always an element.
A compound is made up of two or more elements in a chemical reaction, resulting in covenant and/or ionic bonds.
A homogenous mixture (a solution) is a combination of two or more elements physically without causing a reaction (like salt water or applejuice).
Heterogeneous mixtures are physical combinations that mix but don't appear uniform (think of cereal in milk.)
JANKS is looking under a microscope and sees a colony of green cells living on a spherical structure. She is most likely to be observing a...
A. volvox
B. Amoeba
C. Paramecium
D, Euglena
Answer:
euglena
Explanation:
hope this helps
For each successive electron removed from an atom, the ionization energy
Select one:
a. increases.
b. decreases.
C. remains the same.
d. shows no pattern.
the answer is:
a. increases
a. increases.
Ionization energy:The amount of energy required to remove an electron from an isolated atom or molecule.
→ Trend for Ionization energy:
First ionization energy generally increases as you move left to right across a period. This is due to increasing nuclear charge, which results in the outermost electron being more strongly bound to the nucleus.First ionization energy generally decreases as you move down a group. This is because the outermost electron is, on average, farther from the nucleus, meaning it is held less tightly and requires less energy to remove.Thus, for each successive electron removed from an atom, the ionization energy increases.
Learn more:
brainly.com/question/10545417
*URGENT* Question 3: Chemical Bonds (1 point)
Match each chemical bond to its correct description. (1 point)
A. Ionic bond
___ Sharing of electrons
B. Covalent bond
___ Freely moving electrons
C. Metallic bond
___ Transfer of electrons
Answer:
A) Ionic bond
___transfer of electrons
B) Covalent bond
___sharing of electrons
C) Metallic bond
___freely moving electrons
The correct match of chemical bonds to its correct description are:
A) Ionic bond - transfer of electrons.
B) Covalent bond - sharing of electrons.
C) Metallic bond - freely moving electrons.
What are chemical bonds?Chemical bonds are the attraction of electrons of different atoms to form a bond. These bonds are the reason for the joining of different atoms and forming of substances and compounds.
There are different types of bonds that are formed according to the different atoms and different types of attraction or joining. These bonds are ionic bonds, metallic bonds, and covalent bonds.
The covalent bonds are the strongest bonds because there is sharing of electrons in them. Ionic bonds transfer electrons to each other. Metallic bonds get the free-moving electrons of the elements.
Thus, the correct match is
A) Ionic bond - c, transfer of electrons.
B) Covalent bond - a, sharing of electrons.
C) Metallic bond - b, freely moving electrons.
To learn more about chemical bonds, refer to the link:
https://brainly.com/question/15444131
#SPJ2
How many electrons does gallium give up when it becomes an ion?
Answer:
3 electrons comrade
Explanation:
Which wil be the lower number Atomic Number of Atomic Mass?
-A Whatever
B.DK .
c. Atomic Number
Die Atomic Mass
Answer:
atomic mass
Explanation:
Answer:
The atomic number
Explanation:
The atomic number is the number on the bottom, as for the atomic mass it's the top. You just have to memorize that.
The length breadth and thickness of a brick is 18cm 8 cm and 5cm respictively find the area of the widest part of rhe brick
Answer:
144cm²
Explanation:
Given dimensions:
Length x breadth x thickness
18cm x 8cm x 5cm
The widest part of this figure will be the face containing the length and the breadth.
The breadth is the width of the figure;
Area of the widest part = length x breadth = 18cm x 8cm = 144cm
The area of the widest part of the figure is 144cm²
Determine what elements are denoted by 1s22s22p63s23p64s23d104p65s1
Answer:
Rubidium
Explanation:
Rubidium has atomic number 37 and belong to group one alkali metals and has one valence electron at the outermost shell whiz is 5s1
The given electronic configuration is that of element rubidium which is a s-block element with one valence electron.
Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
Thus, given electronic configuration is that of element rubidium which is a s-block element with one valence electron.
Learn more about electronic configuration,here:
https://brainly.com/question/29184975
#SPJ6
1. Place the molecules in the list in order with the smallest molecules at the top and the largest molecules at the bottom.
= glucose molecule
= starch molecule
= protein molecule
= carbon dioxide molecule
= water molecule
= amino acid molecule
= oxygen molecule
Answer:
Explanation:
In creating this list, one will have to start from the atom (which is the smallest in the list) to the giant polymer (which is the largest in the group). The arrangement below will also be based on there molecular weight.
oxygen molecule (this is the first because it is an atom)
water molecule (this is lighter in weight than carbon dioxide)
carbon dioxide
amino acid molecule (most amino acids have a lesser molecular weight than glucose)
glucose (has a molecular weight of 180.156 g/mol)
protein molecule (several proteins have a lesser molecular weight than starch)
starch molecule (has a molecular weight of 359.33 g/mol)
The arrangement of molecules in the ascending order is: oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.
• The size of the molecules can be determined by knowing their molecular weights.
• The sum of the atomic weights of the atoms in the molecule is known as the molecular weight of the molecule.
• The molecular weight of water is 18 gram per mole, glucose 180.2 g/mol, starch 360 g/mol, carbon dioxide 44 g/mol, protein 20000 g/mol, amino acid for example glycine 75 g/mol, and oxygen 16 g/mol.
Thus, the molecules can be arranged with the smallest to the largest as oxygen, water, carbon dioxide, amino acid, glucose, starch, and protein.
To know more about:
https://brainly.com/question/19922822
What is the volume of 89.6 moles of gas at STP *
Which statement is best supported by the information in the chart?
Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.
Answer:
B
Explanation:
Because , it is the answer .
Based on the information provided in the chart, the statement that is best supported is Atom X will donate electrons to Atom Y. Option A is the correct answer.
Atom X has 6 valence electrons, which means it has 6 electrons in its outermost energy level. Atom Y has 2 valence electrons, indicating that it has 2 electrons in its outermost energy level. In a chemical reaction, atoms tend to either donate or accept electrons to achieve a stable electron configuration. Option A is the correct answer.
Atom X has more valence electrons than Atom Y, suggesting that it is more likely to donate electrons. Since Atom Y has fewer valence electrons, it is more likely to accept electrons from Atom X. Therefore, based on the number of valence electrons, Atom X will donate electrons to Atom Y in order to achieve a stable electron configuration.
Learn more about Atom here:
https://brainly.com/question/17545314
#SPJ2
1) A vehicle is traveling at 150 km/h after 3 hours it is traveling 240 km/h.
Was the vehicle accelerating or decelerating and at what rate?
OkSpeed is still the most common factor in fatal road accidents, ... a few kilometres per hour above the speed limit greatly increases the risk of an ... For a car travelling at 70 km/h the risk increased fourfold. ... where Vf is the final velocity, V0 is the initial velocity, a is the rate of deceleration and d is the distance ...
Missing: 240 | Must include: 240
Rahul was given iron filings and sulphur powder. He prepared a compound of iron sulphide by heating the components in a china dish. What would be his observation if he adds a few drops of dilute sulphuric acid into the compound?
Answer:
A gas with a rotten egg smell is evolved
Explanation:
When iron fillings and sulphur were heated in the vessel, the following chemical reaction took place;
Fe(s) + S(s) -----> FeS(s)
This is a direct combination reaction.
Subsequently, when dilute H2SO4 is added, the following reaction takes place;
FeS(s) + H2SO4(aq) ------> FeSO4(aq) + H2S(g)
He immediately observes the evolution of a gas with a rotten egg smell.
The mass number is the average mass of all isotopes of that element, while the atomic mass is the quantity of protons and neutrons within one atom/isotope. true or false
Answer:
False
Explanation:
Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.
Answer:
false :)
Explanation:
How does an increase in reactant concentration affect the rate of reaction?
Answer:
increase the rate of reaction.
Explanation:
Answer:
A. It leads to more frequent collisions, which increase reaction rate.
Explanation:
EDG
How does cold water affect the speed of dissolving?
Answer:
Anything that can be done to increase the frequency of those collisions and/or to give those collisions more energy will increase the rate of dissolving.
Explanation:
depended on the temperature
calculate the number of different atoms in 0.2 mol ethene
Answer:
1.204 × 10²³
Explanation:
The number of atoms in a mole is always 6.022 × 10²³, known as Avogadro's number or Avogadro's constant.
To convert moles to atoms, multiply the molar amount by Avogadro's number.
(6.022 × 10²³) × 0.2
= 1.204 × 10²³
A baby carriage is sitting at the top of a hill that is 21 m high. The carriage with the baby weighs 12 N. The carriage has __________ energy.
A. Kinetic
B. Potential
Answer:
B
Explanation:
The carriage has potential energy
y’all wanna explain what a water table is?
Answer:
the level below which the ground is saturated with water.
Explanation:
