Answer:
+4
Explanation:
In PbO2, oxygen exhibits an oxidation number of -2 (since it's not a peroxide or superoxide):
Let the oxidation number of Pb be x. Then, for the compound to be neutral, the oxidation numbers of all atoms should add up to zero.
⇒ x + (−2) + (−2) = 0
x = +4
So the oxidation no. of Pb is +4.
I hope this helps.
During winter in cold climates, salt is often used on roads to prevent the buildup of slippery ice. Although salt may make driving safer, it can cause the metallic parts of cars to corrode or rust relatively quickly. In a few sentences, please explain what is occurring.
Answer:
this is because the salt may be acidic and also may have oxygen substituent which can lead to rust
During cold winters, the salt present on the roads reacts with the iron and the dew water and results in the formation of the iron oxide as rust.
What is rust?The rust has been given as the iron oxide compound, that has been formed with the reaction of the water with the iron in the presence of oxygen.
In the winters, there has been the presence of the water in the salt, and the interaction of the salt with the iron to form the iron oxide that is rust.
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Given that the molar mass of naoh is 40.00 g/mol, what mass of naoh is needed to make 2.500 l of a 2.000 m naoh solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.1250 g 5.000 g 32.00 g 200.0 g
The mass of Sodium hydroxide which is needed to make 2.500 L of a 2.000 M NaOH solution is 200 grams.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = required mass
M = molar mass
Given that, molarity of NaOH = 2M
Volume of NaOH solution = 2.5L
Moles of NaOH will be calculated by using the below equation as:
M = n/V
n = (2)(2.5) = 5 moles
Now we calculate the mass of NaOH of 5 moles as:
W = (5mol)(40g/mol) = 200g
Hence option (4) is correct.
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Answer:
d
Explanation:
I will mark brainlist
If the colored spheres represent different solute particles, based on the principles of osmosis, in which overall direction is water (not pictured) most likely to move?
A.
Water will move into the cell.
B.
Water will not move into or out of the cell.
C.
Water will move into and out of the cell equally.
D.
Water will move out of the cell.
Water will move into the cell because of lower concentration of water inside the cell as compared to outside.
Why water moves inside or outside of the cell?Water has a tendency to move across a membrane from a lower osmolarity to a higher osmolarity which means from higher concentration region to the lower concentrated region.
So we can conclude that water will move into the cell due to lower concentration of water inside the cell as compared to outside.
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Answer:
If you're from study island, the answer is D. Water will move out of the cell.
Explanation:
I got it on study island and this was right.
help me my homework pls
Answer:
1. Boron B 13 2 Non-Metal
2. Aluminium Al 13 3 Metal
3. Tin Sn 14 5 Metal
4. Helium He 18 1 Non- Metal
5. Neon Ne 18 2 Non- Metal
6. Calcium Ca 2 4 Metal
7. Francium Fr 1 7 Metal
8. Gold Au 11 6 Metal
2. Fe(s) + O2(g) → Fe3O4(s) a. When 13.54 g of O2 is mixed with 12.21 g of Fe, which is the limiting reactant? b. What mass in grams of iron oxide is produced? c. What mass in grams of excess reactant remains when the reaction is complete? d. A student performed completed this reaction in a lab and made15.88 g of Fe3O4, what was their percent yield?
The percent yield shows the extent to which the reactants are converetd into products . The limiting reactant is used up in the reaction.
What is a limiting reactant?A limiting reactant is the reactant that is in the least amount in the system. Now;
Number of moles of Fe = 12.21 g/56 g/mol = 0.22 moles
Number of moles of O2 = 13.54 g/32 g/mol = 0.42 moles
Balanced reaction equation;
3Fe(s) + 2 O2(g) = Fe3O4(s)
If 3 moles of Fe reacts with 2 mole of O2
0.22 moles of Fe reacts with 0.22 moles * 2 mole/3 moles = 0.15 moles
Hence, Fe is the limiting reactant
If 3 mole of Fe produces 1 mole of Fe3O4(s)
0.22 moles of O2 produces 0.22 moles * 1 mole/3 moles of Fe3O4(s) = 0.1073 moles
Mass of Fe3O4(s) =0.1073 moles * 232 g/mol =16.9 g
Number of moles of excess reactant = 0.42 moles - 0.15 moles = 0.27 moles
Mass of excess reactant = 0.27 moles * 32 g/mol = 8.64 g
percent yield = 15.88 g/16.9 g * 100/1
= 93.4%
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What are the three types of stresses that can be applied to
a system at equilibrium?
Answer:
The 3 stressers are 1. Adding or removing reactants or products. 2. Changing the total pressure or volume. 3. changing the tempature of the system.
Explanation:
All three of these are stressers that can be applied.
-Hope This Helps!
-Justin:)
HELP ANYONE PLEASEE?? TY!!!
Answer:
so the order is grass, which gets eaten by the grasshopper, which is eaten by the frog, which gets eaten by the snake. grass wpuld be at top, snake at bottom.
Explanation:
hope this helps
In an ecosystem, the first trophic level is for grass followed by , grasshopper,snake and then frog.
What is an ecosystem?An ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by action of microbes nutrients are released back in to the soil.
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ATCG combine different patterns to form different ____
Answer:
Chemicals
Explanation:
Your answer would be chemicals because of you have different inputs you would also have a different output depending.
I hope it helps! Have a great day!
Anygays-
Answer:
Chemicals
Explanation:
Different ATCG makes different chemicals.
I hope it helps! Have a great day!
Muffin °-°
NEED IT ASAP!PLEASE HURRY
Answer:
snow, or freezing rain?
Explanation:
because freezing rain can occur then, but snow is more common.
10. How many molecules are contained in 5.6 L of H2 at STP?
Answer:
1 mole of any material contains 6.023×1023 elementary particles. Hence, by ratio and proportion, 5.61mol of diatomic hydrogen gas contains 5.61×6.023×1023 hydrogen molecules =3.3789×1024 H2 molecules.
Explanation:
Chemical that can be mixed with another chemical to reduce the dangerous of a specific chemical
Answer:
Chemical that can be mixed with another chemical to reduce the dangerous of a specific chemichal
HELPPPPPPPPP!!!!....... Which statement best describes how chemical equations demonstrate conservation of mass?
A.
The number of reactants is the same as the number of products.
B.
The compounds are the same on each side of the reaction.
C.
The number of atoms of each element is the same on each side of the equation.
D.
The state of matter is the same on each side of the equation.Which details from the passage are emphasized in both the text and images?
Answer:
A. The mass of reactants is the same as the mass of products
Explain 3 sources of carbon dioxide production and explain how the production of CO2 can lead to global warming.
Answer:
Natural sources include decomposition, ocean release and respiration. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas.
Explanation:
What is the ph of a solution of h2so4 that has [h3o ] = 5.45 × 10–5 m?
The pH of a solution of sulphuric acid that has hydronium ion concentration is 4.26.
How do we calculate pH?pH of any solution is define as the negative logarithm of the concentration of H⁺ ion present in any solution, i.e.
pH = -log[H⁺]
In the question, it is given that:
Concentration of hydronium ion or H⁺ ion = 5.45×10⁻⁵ M
So, pH will be:
pH = -log(5.45×10⁻⁵)
pH = -(-4.26)
pH = 4.26
Hence required pH is 4.26.
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58.0 g of K2SO4 was dissolved in 500 g of water.
What is the molality of the solution? (Molar mass of
K2SO4 = 174.0 g/mol)
m
Round your answer to the nearest hundredth. Do not include units
in your answer.
Answer:
0.67
Explanation:
Molality is mols of solute over kilograms of solvent
there are 58/174 mols of solute, and 0.5 kg of solvent
(58/174)/0.5=0.6666...
Round to the nearest hundreth to get 0.67
Potassium chlorate decomposes to form potassium chloride and oxygen according to the following
equation:
2 KCIO3(s) + 2 KCl(s) + 3 O2(g)
How many grams of oxygen are produced if 244 grams of potassium chlorate decompose and 148
grams of potassium chloride are produced?
O 1.65 g
O 0.607 g
0 96.0 g
O 392 g
Answer:
O 392 g
Explanation:
39.2 grams of oxygen (O2) can be produced.
The concept stoichiometry is used here to determine the grams of oxygen produced. The amount of oxygen produced from the decomposition of 244 grams of potassium chlorate is 96.0 g . The correct option is C.
What is stoichiometry?The stoichiometry is an important concept in chemistry which helps us to use the balanced chemical equation to calculate the amount of reactants and products. Here we make use of the ratios from the balanced equation. It help us to understand how much substance is needed or present.
Here the balanced reaction is:
2 KCIO₃(s) + 2 KCl(s) + 3 O₂(g)
2 moles of KCIO₃ = 2(39 + 35.5 + 3 × 16) = 245 g
3 moles of O₂ = 3 × 2 × 16 = 96 g
245 g KCIO₃ produces 96 g O₂
Therefore 245 g gives 96 × 244/245 = 95.6 g ≈ 96.0 g
Thus the correct option is C.
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Part of the complement system of defense is opsonization. This process
causes the pathogen to become trapped in mucus.
coats the pathogen exterior so that it is recognized by the host's phagocytes.
creates an acidic environment that prevents pathogen attachment
causes holes to form in the pathogen's cell walls.
Answer:
The correct answer is coats the pathogen exterior so that it is recognized by the host's phagocytes. :)
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Need help with predicting products
Na3PO4
+
ZnSO4
Which statement is true of a mechanical wave? a It must have a medium.
b It can travel in a vacuum.
c It must travel in empty space.
d Both sound and light are examples.
Answer:
The answer is A. It must have a medium
Explanation:
With out a medium the wave will not travel at all.
-Hope This Helps!
-Justin:)
Equation for the hydrolysis of glyceryl triethanoate.
The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
What is Hydrolysis?Hydrolysis is a chemical reaction which water molecule break down one or more chemical bonds. This is use for substitution, elimination, and solubility.
Hydrolysis depend on the pH, solubility and chemical constituent of the substance.
Therefore, The equation for the hydrolysis of glyceryl triethanoate is C3H5(OH)3 + 3CH3COOH = C3H3(OCOCH3)3 + HOCH2CH(OH)CH2OH
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Which term describes the molecule shown below?
H H
C=C
H
H
O A. Saturated alkene
O B. Unsaturated alkane
O C. Unsaturated alkene
O D. Saturated alkane
Answer:
The answer is C
Explanation:
unsaturated hydrocarbons have multiple carbon bonds
Unsaturated alkene describes the molecule shown below as the atoms are attached by double bonds.
An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is solid,liquid , gas consists of atoms . Each atom has a nucleus which is contains protons and neutrons and shells in which the electrons revolve.
The protons are positively charged particles and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged particles and hence the atom as a whole is neutral particle and stable due to presence of oppositely charged particles.
Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not change the chemical properties of the substances.
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Why do the protons identify the element and not the electrons or the
neutrons?
what is chemical formula of benzaldehyde?
Answer:
the chemical formula of benzaldehyde is C₇H₆O
When we react an acid with a base a neutralisation reaction occurs.
What pH do you end up with?
Explanation:
Good question!
When you react an acid with a base,the pH of the product is determined by the concentrations of the reactants (the acid and the base)
If both reactants (acid and base) are strong,the pH of the product is 7
If the acid is stronger than the base,the pH of the product will be less than 7
If the base is stronger,the pH of the product will be greater than 7
I hope this helps
What is two masses exerting a force on each other an example of?
Kepler's law
geocentric theory
universal law of gravitation
heliocentric theory
Answer:
universal law of gravitation
Explanation:
According to Newton's law of gravitation, every particle in universe attracts every other particles with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between their centres!
Consider two particles having masses m1 and m2 and are apart r units, then the gravitational force acting between them is given by
[tex]F = G \cdot \frac{m1\cdot \: m2}{ {r}^{2} } [/tex]
Where G is universal gravitational constant or proportionality constant!!
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Boron-10 is commonly used as a control rod for nuclear reactors because it absorbs _______ and releases an alpha particle and a lithium-7 nuclide.
A. a neutron
b. a gamma ray
c. an electron
d. a protron
Your answer is A. a neutron
A rod, plate, or tube containing a material such as hafnium, boron, etc., used to control the power of a nuclear reactor. By absorbing neutrons, a control rod prevents the neutrons from causing further fissions.
Answer:
A. a neutron
Explanation:
Boron-10 is commonly used as a neutron absorber due to the high neutron cross section of isotope 10B.
hope this helps!
Question 10 of 25
How many total electrons can the p orbitals hold?
O A. 2
B. 3
C. 6
D. 10
SUBM
Answer:
[tex]\huge\boxed{\sf C. \ 6}[/tex]
Explanation:
Orbitals:
Wave function that describes the location, electronic cloud and wave-like properties of an electron is called an orbital.Types:
There are 4 types of main orbitals.
s orbital (can accommodate 2 electrons)p orbital (can accommodate 6 electrons)d orbital (can accommodate 10 electrons)f orbital (can accommodate 14 electrons)[tex]\rule[225]{225}{2}[/tex]
what is the numerical value of gold silver and platinum?
Metallic minerals are consumed in _______ amounts than nonmetallic minerals and materials. group of answer choices
giving brainliest please help!