Answer:
Q1: Gases, liquids and solids are all made up of atoms, molecules, and/or ions, but the behaviors of these particles differ in the three phases. ... gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
Q2: Mass is how much stuff something is made of. Volume is how much space an object takes up.
Zn + 2HCl → ZnCl2 + H2
What is the half reaction for the reduction of hydrogen in the reaction?
Answer:
2H^+ +2e -> h2(g)
Explanation:
Since hydrogen is reduced, look for a decrease in oxidation number and the gain of electrons.
Answer:
ZnCl2 + H2
Explanation:
got it correct!
what did the law of octaves state about the elements
Law of octaves states that when the elements are arranged in ascending order of atomic mass, every eighth element has comparable properties.
What are the characteristics of law of octaves ?Features of law of octaves -:
Newland Octaves arranged the known 62 elements into 8 groups of 8 each. The elements were in increasing order of atomic weight.Every element shared properties with the 8th element after it.Some limitations were made into this -:
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The law of octaves state about the elements that there must be 8 electrons in the outermost or valance shell of the electron to obtained the stability.
What is octaves rule?when the elements are arranged in the increasing order of atomic mass, every eighth element has comparable properties and that was the first time an atomic number was introduced to each element of the periodic table.
To become the stable according to rule element must complete it octave otherwise it cannot be considered the stable one.
Therefore, law of octaves state about the elements that there must be 8 electrons in the outermost or valance shell of the electron to obtained the stability.
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Describe the error (what rule does it violate) if there is one in each of the following:
Answer:
prolly the gay one
Explanation:
Which reactant (X) is missing from the equation shown?
X+ PO4 → H3PO4
Answer:
H
Explanation:
b/c the polyatomic PO4¯³
have 3 valance number
20 points to whoever can answer these 3 questions correctly
Pt. 3
Answer:
Explanation:
You can't award 20 points once you have awarded 5.
One
2K + Cl2 ==> 2KCl
It's True
There are 2 Ks and Cl2 has 2 atoms making up on the left.
On the right, 1 molecule of KCl has 1 Potassium and 1 Cl. But there are 2 molecules so between the two of them, there's 2 Potassiums and 2 Cl
Two
The reactant side is the Left side. Cl2 means there are 2 Cl atoms making Cl2. Answer B
Three
False: There are 2 but read below.
I really don't know how to answer that. It's not qualified enough. There are a total of 2 Chlorines on the right hand side when there are 2 molecules. I think you are intended to answer False, but don't be surprised if you get it wrong.
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 foot
The question is incomplete. The complete question is :
A worker paints a 5.2 foot wide crosswalk on a street her boss tells her to make crosswalk 1.25 feet wider. How wide is the finished crossroad ?
Solution :
It is given that the worker paints a crossroad on a street whose width is = 5.2 feet.
The boss of the worker asks the worker to make the width of the cross road 1.25 feet more wider.
Thus the required width of the cross road is = 5.2 feet + 1.25 feet
= 6.45 feet.
Therefore the finished cross road is = 6.45 feet wide.
1. How many atoms of oxygen are present in 0.04 mole NaNO3?
2. How many moles of nitrogen atoms are present in 10.5g of N2O5?
3. How many atoms of oxygen are present in 50g of Fe(H20)2(S04)3? Please answer fast
Answer:
1. 7.227x10²⁴ O atoms
2. 0.1944 mol
3. 3.18x10²³ atoms
Explanation:
1. To solve this problem we need to use Avogadro's number, which states the number of molecules that are in 1 mol of a substance:
0.04 mol NaNO₃ * 6.023x10²³ molecules/mol = 2.409x10²⁴ molecules NaNO₃There are 3 O atoms per NaNO₃ molecule, thus the answer is (3* 2.409x10²⁴) 7.227x10²⁴ atoms.
2. First we convert 10.5 g of N₂O₅ into moles, using its molar mass:
10.5 g N₂O₅ ÷ 108 g/mol = 0.0972 mol N₂O₅There are 2 N moles per N₂O₅ mol, thus the answer is (2*0.0972) 0.1944 mol.
3. First we convert grams into moles:
50 g Fe(H₂O)₂(SO₄)₃ ÷ 379.85 g/mol = 0.132 molThen we use Avogadro's number:
0.132 mol * 6.023x10²³ molecules/mol = 7.95x10²² molecules Fe(H₂O)₂(SO₄)₃There are 14 O atoms per Fe(H₂O)₂(SO₄)₃ molecule, so the answer is (7.95x10²² * 4) 3.18x10²³ atoms.
What happens to the air temperature if you add extra CO2?
Answer:
Adding more CO2 to the atmosphere will cause surface temperatures to continue to increase. However, more energy is absorbed in the weaker bands and in the wings of the strong band, causing the surface and lower atmosphere to warm further.
Sheryl sketched models of two different neutral isotopes of carbon. If the isotope models are accurate, which statement might be true? (Refer to the periodic table if necessary.) O A. One shows 6 neutrons, and one shows 8. O B. One shows 5 protons, and one shows 7. O c. One shows 6 protons, and one shows 7. D. One shows 6 electrons, and one shows 5.
Answer:
O A. One shows 6 neutrons, and one shows 8.
How to name the hydrocarbons? according to IUPAC i guess?
Answer:
hydrocarbons are compounds which contains Hydrogen and carbon
Janice wants to grow flowers in her backyard. She has four types of dirt that she could use, but she is unsure of which type would allow the flowers to grow the best. In order to figure this out, she sets up an investigation. Janice puts each type of soil in a different pot and plants a flower in each pot. What scientific question should Janice ask from her experiment?
A.
Which soil looks the best?
B.
Which soil type allows the flower to grow the most?
C.
Which soil is the oldest?
D.
Which soil type is preferred by most people?
Answer:
B
Explanation:
She is unsure of which soil would allow the flowers to grow best so the soil that allows the flower to grow the most is the best soil.
Answer:
B. which soil type allows the flower to grow the most?
Find the amount of heat (Q) needed to raise the temperature of 5.00 g of a substance from 20.0 C to 30.0C if
the specific heat of the substance is 2.01 J/gC.
Answer:
100.5 J
Explanation:
Percentage of isotopes in 35/17 Cl and 37/17 Cl with the molar mass of chlorine as 35.5g and the mass of each nucleon to be 1.0000 amu
Answer:
The abundance of 35/17 Cl is 75% and 25% of 37/17Cl
Explanation:
The molar mass of an atom is defined as the sum of the masses of each isotope times its abundance, that is:
35.5amu = 35amu*X + 37amu*Y (1)
Where X is the abundance of the 35/17Cl and Y the abundance of 37/17 Cl
As there are just these 2 isotopes and the abundances of both isotopes = 1:
X + Y = 1 (2)
Replacing (2) in (1):
35.5 = 35X + 37(1-X)
35.5 = 35X + 37 - 37X
-1.5 = -2X
X = 0.75 = 75%
And Y = 100-75% = 25%
The abundance of 35/17 Cl is 75% and 25% of 37/17ClWhat is a major problem with CFCs?
A-it is toxic to breathe.
B-It does not readily break down in the atmosphere.
C-It is a greenhouse gas.
D-It isn't a good refrigerant
Select the correct answer.
What is the chemical formula of trisilicon tetranitride?
A.
Si3N4
B.
Si4N3
C.
Si3N6
D.
Si6N3
E.
Si4N6
1. Which of these is a chemical property? *
a) oxygen is a gas at 25 degree Celsius. b) helium is very nonreactive. c) ice melt at 0 degree Celsius. d) sodium is a soft, shiny metal.
Describe the structure of the beryllium atom. In your answer make reference to the number of sub-atomic particles and where they are found in the atom.Immersive Reader
(5 Points)
Answer:
The nucleus consists of 4 protons (red) and 5 neutrons (orange). Four electrons (white) occupy available electron shells (rings). The stability of an element's outer (valence) electrons determines its chemical and physical properties. Subatomic particles are particles that are smaller than the atom. Protons, neutrons, and electrons are the three main subatomic particles found in an atom. Protons have a positive (+) charge. An easy way to remember this is to remember that both proton and positive start with the letter "P."
hope this helped:)
brainliest?
A beryllium atom has atomic number 4 where its nucleus has 4 protons and 5 neutrons and 4 electrons revolving around the nucleus in in the shells.
What is an atom?An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.
The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral 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 alter the chemical properties of the substances.
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During ANY type of phase change, which of the following is TRUE? *
1. The temperature changes
2. The energy increases
3. The energy decreases
4. The temperature stays the same
pls help asap!!!!!!!
which of the following correctly represents the radioactive decay of cesium-137?
Can someone help me thx asap
Answer:
solvent
Explanation:
the solvent is usually a liquid substance
The value of resistance r was determined by measuring current I flowing through the resistance with an error
Correct question is;
Resistance of a given wire is obtained by measuring the current flowing in it and the voltage difference applied across it. If the percentage errors in the measurement of the current and the voltage difference are 3% each, then error in the value of resistance of the wire is?
Answer:
6%
Explanation:
From ohms law, we know that;
R = V/I
Where;
R is resistance
V is voltage
I is current
Now, the percentage error in the resistance is given by the formula;
ΔR/R = ΔV/V+ ΔI/I
We are told that the current and the voltage difference have a percentage error of 3% each. Thus;
ΔR/R = 3% + 3% = 6%
identify a pH value between 2.5 and 7.5 at which the concentration of the weak acid being titrated is less than the concentration of its conjugate base.
The acids do not completely dissociate in water. So, they tend to form a buffer system. Above pH 3.5, the concentration of the conjugate base is more than the concentration of the acid.
Weak acids: These are the acids that do not completely dissociate in water. So, they tend to form a buffer system.Buffers are used to resist a slight change in pH. The pH is equal to the pKa of the solution at equivalence.At equivalence, the concentration of weak acid and its conjugate base is equal.After the equivalence point, the concentration of the conjugate base is more than the concentration of the acid.
Therefore, after 3.5 the concentration of the conjugate base is more than the concentration of the acid.
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Human reproduction involves eggs, ovaries, sperm, and testes.
Which of these are gametes?
A eggs and sperm
B eggs and ovaries
C ovaries and testes
D sperm and testes
Answer:
A. Eggs and sperm
Explanation:
Genres are an organisms reproductive cells. Also referred to as sex cells. Females they are ova or egg cells, and males they are sperm.
Can someone help me thx
Answer:
salt i know the answer and even sugar is
describe a second degree burn
Answer:
Second-degree burns, or partial thickness burns, are more severe than first-degree burns. They affect the outer layer of skin, called the epidermis, and part of the second layer of skin, called the dermis. Second-degree burns can be very painful and often take several weeks to heal.
Explanation:
Help chemistry work!!!!!!!!
Answer:
SEE EXPLANATION
Explanation:
A)
1) The balanced chemical reaction is;
Fe2O3 + 3H2O------> 2Fe(OH)3
2) C12H22O11------> 12 C + 11H2O
B) 1 is a combination reaction
2 is a decomposition reaction
C) The molar mass of NH3 is 14 + 3(1) = 17 g/mol
Percentage composition of N = 14/17 * 100/1 = 82. 4 %
D) 1 mole of O2 contains 6.02 * 10^23 particles
E) For (NH4)3 PO4
We have 3(14 + 4(1)) + 31 + 4(16) = 149 g/mol
F) 1 mole of CaCO3 contains 100g of CaCO3
1.25 moles of CaCO3 contains 1.25 * 100/1 = 125 g of CaCO3
Explain:Will the bag of dog food be easier to lift?
Answer: Registered. My 65 pound dog and my 20 pound dog share an 18 pound bag of 4Health and it lasts them 3 and 1/2 weeks.
Explanation:
Answer:
Well it depends how much the bag weighs in LB and your strength.
Explanation:
What are the number of atoms in chromium
Answer: The correct answer is 24
Explanation:
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.