PbO + CO → Pb + CO₂
Oxidation States of the Elements
Reactants Products
Pb +2 0
O -2, -2 -4
C +2 +4
Since the oxidation state/number of Pb decreased, it is being Reduced.
Since the oxidation state/number of C increased, it is being Oxidized.
∴ this is a Redox ReactionPatterns are everywhere in science. Is there a pattern in how one can predict how many covalent bonds an atom will form? Explain your reasoning or provide evidence to support your answer.
HELP
Actual answer: 6
Well I also need help with this, this should help the both of us:
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Explanation:
The first two period elements can form maximum 4 covalent bonds. However, third or higher period elements can make higher number of bonds for example; SF6.
PLS HELP ASAP!
How many years?
The radioactive isotope carbon-14 is used for radiocarbon dating. The half-life of carbon-14 is 5.73×103 years.
A wooden artifact in a museum has a 14C to 12C ratio that is 0.745 times that found in living organisms. Estimate the age of the artifact.
use graph
Answer:
about 5 years i think
Explanation:
I've tried all the methods i know
it's about 5 years
hope it helps
The age of the artifact is equal to 2.5 × 10³ years when the half-life of carbon- 14 is 5.73 × 10³ years.
What is the half-life period?The half-life of a radioactive element is defined as the time that is required to decrease the original quantity of a radioactive isotope to half after decay.
The half-life of a radioactive isotope is the feature of the element and does not depend upon the actual amount of the radioactive isotope.
Given, the ratio of the initial and left amount of ¹⁴C is :
N = 0.745 N₀
The half-life period of the ¹⁴C isotope = 5.73 × 10³ years
The rate constant of the decay of radioisotope can be calculated from the below-mentioned formula:
[tex]\displaystyle k=\frac{0.693}{t_{1/2}}[/tex]
[tex]\displaystyle k=\frac{0.693}{5.73 \times 10^3}[/tex]
k = 0.123 × 10⁻³ yr⁻¹
The age of the artifact can be calculated as:
[tex]\displaystyle t =\frac{2.303}{k} log\frac{N_0}{N}[/tex]
[tex]\displaystyle t =\frac{2.303}{0.123\times 10^{-3}} log\frac{N_0}{0.735 N_0}[/tex]
t = 2.5 × 10³ years
Learn more about the half-life period, here:
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please help!! will have a thanks and brainliest
Answer:
A
Explanation:
I just did learned all about this
1. What is the name of the metal which exists in liquid state at room temperature?
(a) Sodium
(b) Potassium
(c) Mercury
(d) Bromine
2. Heterogeneous mixture in which the solute particles do not dissolve and remain suspended throughout the solvent and the solute particles can be seen with the naked eye is known as:
(a) Colloidal solution
(b) Solution
(c) Suspensions
(d) both (b) and (c)
3. In tincture of iodine, find the solute and solvent?
(a) alcohol is the solute and iodine is the solvent
(b) iodine is the solute and alcohol is the solvent
(c) any component can be considered as solute or solvent
(d) tincture of iodine is not a solution
4. A pure substance which is made up of only one kind of atom and cannot be broken into two or more simpler substances by physical or chemical means is referred to as ?
(a) a compound
(b) an element
(c) a molecule
(d) a mixture
Answer:
1. mercury.
2. suspensions.
3.iodine is the solute and alcohol is the solvent.
4. A element.
Read the claim.
Breakfast is an important meal. It jump starts the body’s process of using calories to break down food. Appetite can decrease with age, but going too long without eating causes metabolism to slow down. Current research shows that incorporating legumes such as lentils and chickpeas into meals boosts metabolism for twenty-four hours.
Who might benefit from this claim?
people who have a fast metabolism
stores that sell exercise equipment
people who take vitamin supplements
grocery stores that sell legumes
Answer:
i think people who take vitamins
Answer:
its d;grocery stores sell legumes
Explanation:
I just took the test
What is the formula for the ionic compound formed when aluminum bonds with arsenic?
Answer:
AlAsO4
Explanation:
Aluminium arsenate is an inorganic compound with the formula AlAsO4. It is most commonly found as an octahydrate. It is a colourless solid that is produced by the reaction between sodium arsenate and a soluble aluminium salt.
Is it alr to have a rebound??
Answer:
Next time you're just recently out of a serious relationship, and you're craving some sort of intimacy and comfort, feel confident that a rebound might actually be a good thing as long as it's an upgrade, either physically, emotionally, a fun date, or even just finding a way to shift your mentality toward viewing. so what im saying is if your happy in that relationship stay in it and if he or she becomes a meany leave it its not goo for your health
Why can groundwater only collect in rock that is porous?
Porous rock has gaps between rock particles that can fill with water.
Porous rock contains different-sized particles.
Porous rock is made of certain types of rock that attract water molecules.
Porous rock contains particles that are very close together.
Answer: Porous rock has gaps between rock particles that can fill with water. but i’m not 100% sure
Explanation:
Answer:
porous rock has gap between rock particles that can fill with water
Which element has the greatest first ionization energy?
B
C
Be
Li
Which statement is true about the ionic size of the elements in a group as one moves from bottom to top in that group?
Ionic size decreases from bottom to top within the group.
Ionic size increases from bottom to top within the group.
Ionic size does not vary in any predictable way within the group.
Ionic size stays the same within the group.
Answer:
helium
Explanation:
The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.
Answer: 2nd answer " C "
Explanation:
First ionization energy is a periodic trend that increases up and to the right on the periodic table. After looking at the position of these elements on the periodic table, carbon is clearly the best answer-choice (B) aka " C "
Someone pls help me I will make you brain
Answer:
I think it's true
the energy of an electron in a multielectron atom is determined by
Answer:
by principal quantum number (n) and azimuthal quantum number (l)
Explanation:
I used the web to answer so I'm not sure if this is right
When an electron in excited energy level drops to a lower energy
level, a photon is emitted.
If the electron is dropping to n=1, which transition will emit the longest
wavelength? n= ____ was to n=1.
The transition between n=1 and n=2 corresponds to the longest wavelength with the lowest frequency.
An electron is said to be "excited" when it is promoted to a higher energy level inside its bound state.
Either the electron absorbs a photon and obtains all of its energy, or it receives energy via a collision with another, energetic electron.
Understanding energy levels :
Therefore the transition between n=1 and n=2 corresponds to the longest wavelength at the lowest frequency.
The higher the frequency of a photon, the higher its energy.
The longer the wavelength of a photon, the lower its energy.
E ∝ 1/λ [ FOR PHOTON ]
The lowest energy is 1 eV, which corresponds to the transition between the n=1 and n=2 levels.
The longest wavelengths are associated with the lowest energies, so transitions between n=1 correspond to the longest wavelengths.
The term "thermal excitation" refers to the process by which electrons within a semiconductor crystal lattice are elevated to a higher energy band via lattice vibrations. This process, known as electron relaxation, occurs when an excited electron returns to a less energetic state.
As a result, a photon is released into the environment, or energy is transferred to another particle. The amount of energy released is proportional to the gap in potential energy between the electron's lowest and highest states.
Want to know more about electrons;
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Which diagram or diagrams represent a compound?
Answer:
A - X Only
Explanation:
classify these diatomic molecules as diamagnetic or paramagnetic.
water resists changing its temperature because it has a high specific heat. true or false?
Answer:
true
Explanation:
what kind of bond is formed between the two hydrogen atoms and the single oxygen atom?
What MUST always be true of the masses of the red and blue liquids?
А.
They will NEVER equal the mass of the purple liquid to the right of the arrow.
B.
They will ALWAYS equal the mass of the purple liquid to the right of the arrow.
A student was adding baking soda and vinegar in a bottle. They then put a balloon on top of the bottle immediately after adding them together. The student observed that the balloon inflated and got larger. The student then predicted that the chemical reaction between the vinegar and the baking soda had created brand new matter, and would have more mass at the end of the reaction. Would you agree with the student’s prediction or not? Explain your answer.
Whoever answers my question gets BRAINLIEST!!
Answer:
The prediction of the student about the amount of reactant and product is incorrect.
No, I do not agree with the student’s prediction because the amount of reactant is always equals to the amount of product. According to the Law of Conservation of Mass, mass cannot be created nor destroyed. Therefore in any chemical reaction the mass of the products must equal or same to the mass of the reactants so according to this law, the prediction of the student is incorrect.
Explanation:Give brailiest please
Answer:
The chemical reaction that occurs when vinegar and baking soda (sodium bicarbonate) are combined, creates a gas that is known as carbon dioxide (or CO2). I would agree with the student's prediction because the atoms rearrange themselves to create the product.
Explanation:
Hope this helps! Pls give brainliest!
Which letter corresponds with the location of f orbitals on the periodic table?
Answer:
The correct would be C i think :)
Explanation:
Stay postivie :)
What is photosynthesis?
Answer:
when the sun's light hits a living thing
Please someone help!!!!!!!!
Answer & Explanation:
For the water to H2 and O2 problem:
1) Reactant is H20, it is to the left of the arrow.
2) Products are H2 (gas) and O2 (gas) because it is to the right and what is created.
For the CO2 + water -> Glucose + Oxygen problem:
1) Reactant is CO2 and H2O, it is to the left of the arrow and what is being changed.
2) Products are C6H12O6 (glucose) and O2 (gas) because it is to the right and what is created.
2. In which sentence is the term heat used correctly?
A. Heat moves from a cold cup to warm tea.
B. A thermometer measures the heat in an object.
C. The heat from the hot cup warms my hands.
D. Warm soup contains more heat than cold soup does.
Answer:
c. The heat from the hot cup warms my hands
True or false chemistry. No links.
Could someone help me pls
Answer:
a) dispersion
b) draw the path ray of green light between the red and violet path rays
c) greater/faster
Explanation:
b) Order of rainbow colours:
RedOrange YellowGreenBlueIndigoVioletc) Violet is the most refracted colour while red is the least refracted colour; the colour with a greater speed is the most refracted
The atomic mass of hydrogen is 1. How many protons does a hydrogen atom have?
What is the name of this process?
Answer:
Fertilization
Explanation:
Fertilization occurs when the nucleus of both a sperm and an egg fuse to form a diploid cell, known as zygote. The successful fusion of gametes forms a new organism.
Someone pls help me I will make you brain
Answer:
2 and 3 is the answer because Methane is emitted from a variety of anthropogenic (human-influenced) and natural sources. Anthropogenic emission sources include landfills, oil and natural gas systems, agricultural activities, coal mining, stationary and mobile combustion, wastewater treatment, and certain industrial processes
Which change is likely to happen to an atom of the element strontium (Sr) during bonding?
(1 point)
It will gain electrons, forming a positive ion.
It will gain electrons, forming a positive ion.
It will give up electrons, forming a negative ion.
It will give up electrons, forming a positive ion.
It will gain electrons, forming a negative ion.
Answer: It will give up electrons, forming a positive ion.
During bonding, strontium atom will give up electrons, forming a positive ion.
STRONTIUM:
Strontium (Sr) is an element in group 2 of the periodic table. Just like every other element in group 2, strontium posseses two valence electrons in its outermost shell. Strontium will undergo bonding with other atoms by losing its two (2) valence electrons to form a cation i.e. a positively charged ion. Therefore, strontium atom will give up electrons, forming a positive ion when it undergoes bonding.Learn more at: https://brainly.com/question/21085681?referrer=searchResults
1.The chemical or substance used to start a reaction are called
Answer:
The substance (or substances) initially involved in a chemical reaction are called reactants or reagents.
Explanation:
Answer:
The chemical or substances used to start a reaction are called reactants.
How many grams in 2.33 mols of H20 (water)?
Answer:
41.9866
Explanation:
18.02x2.33
Hope this helps!
(please make me brainleist I need to level up)