How many valence electrons are in an atom of Zinc (III)
Atomic number 30
Atomic mass 65.38
a 12
b 35
c 3
d 30
Answer:
A.) 12
Explanation:
The number of valence electrons= the group number
Answer:
c) 3 valence elcertons
Level 3
Q1
Forces that are equal but opposite
are called
A. Net force
B. Friction
C. Centripetal force
D. Balanced forces
option D Balanced force
A 40 g gold coin is heated from 10°C to 50°C (CAuis 0.13 J/g−°C). What is the △H?
The answer would be +208 J.
The empirical formulae of a compound is CH2O. The relative formula mass for the molecular formula is 180. What is the molecular formula?
Answer:
ch20 is the empirical formula for glucose , c6h1206 is the molecular formula .
PLESE HELP! Which of the following sugar solutions is the most concentrated?
Select one:
a. 25 g of sugar in 60 mL of water
b. 2 g of sugar in 100 mL of water
c. 15 g of sugar in 25 mL of water
d. 12 g of sugar in 30 mL of water
c.15gof in25mlof wather
The sugar solution that is the most concentrated is 15 g of sugar in 25 mL of water.
CONCENTRATION:
The concentration of a solution is related to the amount of a substance and its volume. The concentration of a solution is directly proportional to the amount of a substance but inversely proportional to the volume. This means that the concentration increases with an increasing amount of substance but decreases with an increasing volume. According to this question, 15g of sugar is the highest amount and it dissolves in 25mL of water, which is the lowest volume. Therefore, it is the most concentrated sugar solution.Learn more at: https://brainly.com/question/202460?referrer=searchResults
Why can't hydrogen be grouped in a family?
Answer:
A Family Portrait
That element is NOT in the family. When we told you about families, we said that they were groups of elements that react in similar ways. Hydrogen is a very special element of the periodic table and doesn't belong to any family. While hydrogen sits in Group I, it is NOT an alkali metal.
Answer:
Explanation:
The chemical properties are so different and cannot be group into a family Hydrogen is the simplest, smallest and lightest of the elements. Unlike the other elements of the periodic table, the combination of properties it exhibits doesn't match any one single grouping or family.
A student uses 0.0821 L• atm/mol • K as the value of the gas constant. What is most likely true about the variables in the ideal gas law?
P has the units of liters • atmospheres, and T has the units of kelvin.
P has the units of liters • atmospheres, and T has the units of degrees Celsius.
V has the units of liters, and T has the units of kelvin.
V has the units of liters, and T has the units of degrees Celsius.
Answer: V has the units of liters, and T has the units of kelvin.
Ideal gas law: p·V = n·R·T.
atm · L = mol · L·atm/mol·K · K; both side of equatation have same values.
R = 0,08206 L·atm/mol·K; universal gas constant.
p is pressure of the gas, unit is standard atmosphere (atm).
V is volume of the gas, unit is liters (L).
n is amount of substance of the gas; unit is mole (mol).
T is temperature of the gas, unit is Kelvin (K
Hope this helps!!
Explanation:
Answer: V has the units of liters, and T has the units of kelvin.
Explanation:
formula of barium hydroxide and potassium superoxide
Answer:
Barium hydroxide Ba(OH)2
Potassium superoxide KO2
Which of these is NOT found in the earths crust?
Oxygen
Iron
Sulphur
Helium
Explanation:
helium
Helium gas is not found in earth crust
magine that you need to take a medicine that the doctor has prescribed for you. Explain why scientists who developed that medicine would need to know whether or not the compound in that medicine is polar. How might a polar medicine behave differently as it dissolved in the body than a nonpolar medicine would?
Answer:
hi
Explanation:
The compound in medicines should be non polar. Therefore scientists need to be sure of using compounds that are non polar in nature so they pass through the cell membrane and enter into the blood circulation of the body and perform its due function.
True/False. A program is an algorithm that has been coded into something that can be run by a machine. *
Answer:
true
Explanation:
What is the key difference between a liquid and a gas?
A. average kinetic energy
B. intermolecular attractions
C. the ability to flow
B. intermolecular attractions.
If the electromagnet in the PhET simulation is disconnected from the battery, the compass needle will...
Answer: Point north.
The surface currents of Earth’s oceans are most likely created by which of the following?
Answer:
global wind patterns. the rotation of the Earth. the shape of the ocean basins.
Explanation:
How to name the hydrocarbons? according to IUPAC i guess?
Answer:
hydrocarbons are compounds which contains Hydrogen and carbon
what is the conclusion that males are stronger than females
A car is driving directly south down a road. It slows down to
stops at a few stop signs, and then, accelerates up to 30 miles
per hour.
Is the car's velocity changing? Why or why not?
when combined the two substances together in the cup, the product can be described as a ____ or ____ (there are two possible answers . you just need to choose one )
1. white gas
2. white liquid
3. white solid
why is carbon classified as an element
Answer:
D: It combines with oxygen to form a gas.
Explanation:
Carbon is classified as an element because of its ability to combine with other elements and form a new substance or compound.
Looking at the options, the correct option in the light is option D
What is the formula for sulfate?
What is the charge of sulfate?
What is the correct formula for copper (II) sulfate?
Answer:
SO₄²-, -2, CuSO4
Explanation:
Dang that was long.
What type of chemical reaction is given by the following balanced equation:
Al₂O3 → AL+ O₂
Answer:
Decomposition
Explanation:
Select the correct answer.
Copper carbonate (CuCO3) reacts with hydrochloric acid (HCl) according to this equation:
CuCO3(s) + 2HCl(aq) → CuCl2(aq) + H2O(l) + CO2(g).
Which statement correctly describes the substances in this reaction?
A.
Exactly one product and two reactants are either liquid or dissolved in water.
B.
Exactly one of the reactants is in a water-based solution, but none of the products are.
C.
The reactants include both a liquid and a gas.
D.
Exactly one reactant is a solid, and exactly one product is a gas.
E.
The products include a solid, a liquid, and a gas.
Answer:
I think the answer would be option d.
hope it helps.
How many moles are in 435 grams of sulfur, S?
Answer:
32.065 is the correct answer.
How many times as bright as a light that is 90 m away from you does a light that is 10 m away from you appear?
Answer:
81 x as bright
Explanation:
The intensity of light is dependent on distance according to this simple equation:
(90/10)^2 = 9^2
= 81
This was derived from the inverse-square law. Respectively a light that is 10 m away from you is 81 x as bright.
5. What is the charge on a single proton?
Answer:
it may be +1 or -1 hope this help
An atom is a kind of stuff that cannot be further decomposed chemically. Therefore, the charge on a single proton is +1.
What is atom?
The building block of an element is an atom. An atom is a kind of stuff that cannot be further decomposed chemically. The three main components of an atom are protons, neutrons, plus electrons.
Some substances are either bigger or smaller than atoms. Instances of chemical species that aren't commonly regarded as atoms include protons, neutrons, and electrons, which are atom-related particles. Atoms make up molecules and compounds, however they are not actual atoms. Salt is an example of a molecule and a compound (NaCl). The charge on a single proton is +1.
Therefore, the charge on a single proton is +1.
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35. 124.31 g of silver nitrate reacts with 52.89 g of sodium chloride.
g
a. What is the mass of the products?
Answer: Thus mass of products is 177.2 g
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical reaction is:
[tex]AgNO_3+NaCl\rightarrow NaNO_3+AgCl[/tex]
mass of silver nitrate [tex](AgNO_3)[/tex] = 124.31 g
mass of sodium chloride [tex](NaCl)[/tex] = 52.89 g
mass of reactants = mass of silver nitrate [tex](AgNO_3)[/tex] +
mass of sodium chloride [tex](NaCl)[/tex] = 124.31 g + 52.89 g = 177.2 g
Thus mass of products = mass of reactants = 177.2 g
How many moles of water (H2O) are produced when 2 moles of KMnO4 react with plenty of HCl?
2 KMnO4 + 16 HCl → 2 KCl + 2 MnCl2 + 8 H2O + 5 Cl2
A. 2
B. 16
C. 8
D. 5
Answer:
16
Explanation:
2 KMnO4 (aq) + 16 HCl (aq) → 2 MnCl2 (aq) + 2 KCl (aq) + 5 Cl2 (g) + 8 H2O (l)
This is an oxidation-reduction (redox) reaction:
2 MnVII + 10 e- → 2 MnII (reduction)
10 Cl-I - 10 e- → 10 Cl0 (oxidation)
KMnO4 is an oxidizing agent, HCl is a reducing agent.
This is a gas evolution reaction, Cl2 is the formed gas.
What is the volume of a container containing 7.59 moles of krypton gas at STP?
170.034 L is the volume of a container containing 7.59 moles of krypton gas at STP.
What is an ideal gas equation?
The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
Using the ideal gas equation
PV =nRT
Where P is the pressure
V is the volume
n is the number of moles
R is the ideal gas constant (R = 0.08206 L atm mol⁻¹ K⁻¹)
T is the temperature.
From the given information
V =?
n = 7.59
and at STP
P = 1 atm
T = 273 K
Putting the parameters into the formula, we get
PV =nRT
1 atm x V = 7.59 mol x 0.08206 L atm mol⁻¹ K⁻¹ x 273 K
V = 170.034 L
Hence, 170.034 L is the volume of a container containing 7.59 moles of krypton gas at STP.
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An increase in the bat population would most likely result in
А
Decrease in mold growth
B
An increase in the outisde insect population
с
A decrease in bat bug population
D
A decrease in the outside insect population
Answer:
Explanation:
D
A decrease in the outside insect population
How many atoms are in a single molecule of FeCl2
