Answer:
chemical bonds and covalent bonds
Explanation: covalent bonds are in which the valence electrons density is shared between two atoms and chemical bonds are the connections between atoms in a molecule . electrons can be either free [not attached to any atom] or bound to nucleus of an atom. atom or molecule is a number of an ion which is either positive or negative. when we combine ion we can only combine elements with ionic bonds. when atoms join together , they form chemical bonds without transferring any electrons but they rather share them. copper sulphide are the last shell that are shared with bonding . proteins, carbohydrates, lipids are the example of macromolecules . nucleic acids, lipids, proteins, carbohydrates are the main atoms involved in carbon chemistry.
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A gate made of painted iron is beginning to rest in areas where the paint has worn away why is the formation of rust considered a chemical change?
Answer:
because it is two substances reacting together to create a new substance
Explanation:
when iron rusts, iron molecules react with the oxygen molecules creating iron oxide aka rust.
Nitrogen and hydrogen make ammonia. If you begin with 36.2g of nitrogen and excess hydrogen, how many grams of ammonia can you make?
Answer:
Mass = 44.2 g
Explanation:
Given data:
Mass of nitrogen reacted = 36.2 g
Mass of ammonia formed =?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of nitrogen:
Number of moles = mass/molar mass
Number of moles = 36.2 g / 28 g/mol
Number of moles = 1.3 mol
Now we will compare the moles of nitrogen and ammonia from balanced chemical equation to determine how many moles of ammonia re formed.
N₂ : NH₃
1 : 2
1.3 : 2/1×1.3 = 2.6 mol
Mass of ammonia:
Mass = number of moles × molar mass
Mass = 2.6 mol × 17 g/mol
Mass = 44.2 g
What is solubility a measure of?
A. The amount of solute that will dissolve
B. The type of solute that will dissolve
C. The rate at which the solute will dissolve
D. The energy needed for the solute to dissolve
Answer:A
Explanation:
I just took the test
The diagram below shows the eye, with several features labeled.
Which part of the eye is responsible for focusing an image onto the retina?
A
B
C
D
For your question about diagram it is definitely A
Answer:
A
Explanation:
what will you suggest to a person who is suffering from the problem of acidity after overeating?
Answer:
If someone is suffering from the problem of acidity after overeating Baking soda solution would be suggested as a remedy as it is basic in nature, it neutralises excess acid in the stomach.
Help will give brainliest!!
Give oxidation and reduction half-reactions to the equation provided
Half reaction :
Oxidation
Cu ⇒ Cu²⁺ + 2e⁻
Reduction
2Ag⁺+ 2e⁻ ⇒2Ag
Further explanationGiven
Reaction
Cu+2AgNO₃⇒Cu(NO₃)₂+2Ag
Required
Oxidation and reduction half-reactions
Solution
Oxidation is an increase in oxidation number, while reduction is a decrease in oxidation number.
OxidationCu ⇒ Cu²⁺ + 2e⁻
0 to +2
Reduction2Ag⁺+ 2e⁻ ⇒2Ag
+1 to 0
A student placed one hundred dominoes upright in a row. He knocked over the first domino and the rest all fell over; one after another. What made the domino at the end of the row move?
a.chemical energy
b.heat energy
c.mechanical energy
d.electric energy
Answer:
b. heat energy
Explanation:
The domino at the end of the row move should be heat energy.
What is heat energy?Heat energy refers to the energy where it leads to the small particles movement. It can be treated as the atoms, molecules, etc. Also, the one object to other object should be shifted in this. Since the student placed one hundred dominoes upright in a row so here the heat energy should be used.
Learn more about energy here; https://brainly.com/question/17172186
The force that pulls falling objects toward Earth is called?
the force that pulls falling objects is gravity.
please help on question 7 and 8
Answer:
7. 5km/h
8. 10km/h
I just need to add characters so i can post
The term that refers to how much of a solute can be dissolved is
Why do molecules with lone pairs of
electrons have different molecular
geometry's compared to those with the
same number of electron domains.
Answer:
Because according to VSEPR theory lone pair occupies more space than bond pair.
Explanation:
Lone pair of electrons repels from bonded pair of electrons than that between bond pair of electrons itself. Hence, molecules attain a geometry in which the repulsive force is minimum.
What is lone pair of electrons ?The lone pair of electrons are pair of electrons which are not involved in bonding in any occasion but can be donated through coordinate bonds in some compounds.
Oxygen, nitrogen etc. contains lone pair of electrons. According to VSEPR theory, the lone pair -lone pair repulsion > lone pair -bond pair > bond pair-bond pair repulsion.
Therefore, these electron pairs are aligned around the central atom in such a way that the repulsive force between the electron clouds are minimized.
For example, if consider hybridization of water molecule, it must acquire a tetrahedral shape, but the lone pairs will align axial and will assume a bent shape.
Find more on molecular geometry:
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is inorganic fertilizer and chemical fertilizer same?
Fertilizers supplement the soil with macronutrients needed in large amounts: nitrogen, phosphorous and potassium. ... Inorganic fertilizer, also referred to as synthetic fertilizer, is manufactured artificially and contains minerals or synthetic chemicals. so no
Explanation:
What is the molarity of a sodium carbonate solution containing 32.52 g Na2CO3 dissolved in enough water to make 822 ml of solution?
NEED ASAP PLEASE!!
The molarity of a Sodium carbonate solution : 0.373 M
Further explanationGiven
32.52 g Na₂CO₃
822 ml of solution = 0.822 L
Required
The molarity
Solution
Molarity shows the number of moles of solute in every 1 liter of solution.
[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]
mol of solute = mol of Na₂CO₃ :
= mass : MW Na₂CO₃
= 32.52 g : 106 g/mol
= 0.307
Molarity :
= n : V
= 0.307 mol : 0.822 L
= 0.373 M
Complete and balance the equations for the following double displacement reactions:
Answer:
A. AgNO₃ + NaCl —> AgCl + NaNO₃
B. Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂
C. 3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃
Explanation:
The equation given in the question above can be balanced as follow.
A. AgNO₃ + NaCl —> AgCl + NaNO₃
The above equation is already balanced.
B. Mg(NO₃)₂ + KOH —> KNO₃ + Mg(OH)₂
There are 2 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 2 before KOH as shown below:
Mg(NO₃)₂ + 2KOH —> KNO₃ + Mg(OH)₂
There are 2 atoms of K on the left side and 1 atom on the right side. It can be balance by writing 2 before KNO₃ as shown below:
Mg(NO₃)₂ + 2KOH —> 2KNO₃ + Mg(OH)₂
Thus, the equation is balanced.
C. LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃
There are 3 atoms of H on the right side and 1 atom on the left side. It can be balance by writing 3 before LiOH as shown below:
3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + LiNO₃
There are 3 atoms of Li on the left side and 1 atom on the right side. It can be balance by writing 3 before LiNO₃ as shown below:
3LiOH + Fe(NO₃)₃ —> Fe(OH)₃ + 3LiNO₃
Thus, the equation is balanced.
How are atoms an example of diversity?
A. Atoms can gain and lose protons.
B. Atoms can change their properties.
C. Atoms behave unpredictably.
D. Atoms form millions of molecules.
D. Atoms form millions of molecules. :)
Answer:
As I guess ans to yr question is D. Atoms from millions of molecules.
Why is it important to know the properties of both solutes and solvents when preparing a solution that is expected to meet a certain need?
Does this involve a chemical change or a physical change? Explain
Answer:
A solution is consist of solute and solvent and they both together determine the properties of complete solution. It is important to know the properties of both solute and solvent because they both depend on each other to meet a certain need, for example: the intermolecular forces between solutes and solvents determine the solubility of solute in solvent and if solutes must be completely dissolved in the solvent for a homogenous mixture.
The combination of solute and solvent to form a solution is a physical process and not a chemical one because it des not change the chemical properties of solute and solvents.
Which one of the following substances is an element?
Answer: Fe
Explanation: Fe (Iron) is the only element since it involves only 1 atom. The other options are compounds, since there are more than 2 atoms bonded together.
The heating of 7.820 g of hydrated magnesium sulfate (MgSO4 • xH2O) crystals results in a mass of 3.547 g of anhydrous magnesium sulfate. Determine the formula of this hydrate. Name this formula.
MgSO₄•8H₂O
Magnesium sulfate octahydrate
Further explanationGiven
7.820 g of Magnesium sulfate (MgSO₄ • xH₂O)
3.547 g of anhydrous magnesium sulfate
Required
The formula
Solution
Mass of H₂O :
= 7.820 g - 3.547 g
= 4.273 g
MW MgSO₄=120 g/mol
MW H₂O = 18 g/mol
Mol ratio MgSO₄ : H₂O
= 3.547/120 g/mol : 4.273/18
= 0.0295 : 0.2374
= 1 : 8
The formula :
MgSO₄•8H₂O
Magnesium sulfate octahydrate
Balance the following equation on scrap paper:
AIF3+Li2O → Al2O3 + LiF
Answer:
2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF
Explanation:
AlF₃ + Li₂O —> Al₂O₃ + LiF
The above equation can be balanced as follow:
AlF₃ + Li₂O —> Al₂O₃ + LiF
There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 2 before AlF₃ as shown below:
2AlF₃ + Li₂O —> Al₂O₃ + LiF
There are 6 atoms of F on the left side and 1 atom on the right side. It can be balance by writing 6 before LiF as shown below:
2AlF₃ + Li₂O —> Al₂O₃ + 6LiF
There are 2 atoms of Li on the left side and 6 atoms on the right side. It can be balance by writing 3 before Li₂O as shown below:
2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF
Thus, the equation is balanced..!
2. The vertical columns in the periodic
table are called
O families
O periods
O rows
Answer:
2. Periods
Explanation:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.
Which one of these has kinetic energy?
A. book on the table
B. rock on top of a hill
C. a stationary car
D. A moving train
Answer:
The moving train
Explanation:
Kinetic energy is energy being used right now. So, the only object using energy right now is the moving train
Good luck on the rest of the test!
what are the two ways light moves through space? for astronomy the solar system
Answer:
The Solar System moves through the galaxy with about a 60° angle between the galactic plane and the planetary orbital plane. The Sun appears to move up-and-down and in-and-out with respect to the rest of the galaxy as it revolves around the Milky Way
Explanation:
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Give an example of number 14 in real life?
Answer:
im 14 years old.
Explanation:
Convert 12.0 g of FeO into moles.
1 mole
71.85 moles
5.99 moles
O.17 moles
Answer:
71.85 moles
5.99 moles
O.17 moles
Explanation:
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Answer:
4th option: 0.17 moles
Explanation:
The number of moles of a substance can be calculated using the following formula: Mole= Mass ÷Mr
The Mr of a compound is its molecular weight, which is the sum of the relative atomic masses of the atoms it is made up of.
Find the Mr using the periodic table:
Mr of FeO
= 55.8 +16
= 71.8
Calculate number of moles:
Amount of FeO
= 12 ÷71.8
= 0.17 moles (2 d.p.)
To learn more about moles, check out: https://brainly.com/question/19294448
Directions: Drag each label to the correct location on the image.
A diagram of a plant cell is shown below. Each line on the diagram points to a different cell organelle. The labels shown each
describe the function of one of these organelles. Correctly match the cell organelles with their functions.
Answer:
........................................
This type of erosion picks up materials and transports them in the air, often causing the abrasion of surfaces.
Answer: Sediment Transport by Wind
Explanation: Like flowing water, wind picks up and transports particles. Wind carries particles of different sizes in the same ways that water carries them (Figure below). Tiny particles, such as clay and silt, move by suspension. They hang in the air, sometimes for days.
suggest why you cannot compare the reactivity of sodium and potassium using displacement reactions in solution
Answer:
Sodium has an atomic number of 11 while potassium has an atomic number of 19
• Despite smaller atomic number, sodium is denser than potassium
• Potassium reacts much more violently with water
• While excess of sodium is harmful for us, low levels of potassium have also been found to be associated with certain disorders of lungs and heart.
Explanation:
found this on the internet
Identify the molecule containing the least oxygen atoms. A) 12.044 × 10^23 molecules of CO2. B) 12 g of O3. C) 0.1 mol of V2O5. D)10 mL of H2O.
Answer:
C. 0.1 mol of V₂O₅
Explanation:
Number of moles of oxygen atoms present in each molecule is derived as follows:
A. Number of molecules of CO₂ in 12.044 * 10²³ molecules of CO₂ = 12.044 * 10²³/6.022 * 10²³ = 2 moles of CO₂ molecules
Each molecule of CO₂ contains 2 atoms of oxygen. Therefore, number of moles of oxygen atom present in 2 molecules of CO₂ = 2 * 2 moles of oxygen atoms = 4 moles of oxygen atoms.
B. Number of moles of O₃ molecules in 12g of O₃ = mass of O₃/molar mass of O₃
molar mass of O₃ = 48 g/mol
Number of moles of O₃ molecules = 12/48 = 0.25 moles of O₃
There are 3 atoms of oxygen in a molecule of O₃, therefore number of moles of oxygen atoms present in 12 g of O₃ = 3 * 0.25 = 0.75 moles of oxygen atoms
C. There are 5 oxygen atoms in a molecule of V₂O₅
0.1 mol of V₂O₅ contains 0.1 * 5 moles of oxygen atoms = 0.5 moles of oxygen atoms.
D. mass of 10 mL of H₂O = 10 g since the density of H₂O = 1 g/mL
molar mass of H₂O = 18.0 g/mol
Number of moles of H₂O in 10 g of H₂O = 10/18 = 0.56 moles
There are 1 atom of oxygen in a molecule of H₂O, therefore, number of moles of oxygen present in 10 g of H₂O = 0.56 * 1 = 0.56 moles of oxygen atoms
Therefore, 0.1 mole of V₂O₅ contains the least number of oxygen atoms.
1. Calculate the percent composition for each element in CH 206 Glucose.
%C = 40
%H = 6.67
%O = 53.33
Further explanationGiven
Glucose C₆H₁₂O₆
Required
The percent composition
Solution
MW Gulucose = 180 g/mol
Ar C = 12 g/mol
Ar H = 1 g/mol
Ar O = 16 g/mol
%C = 6.12/180 x 100% = 40%
%H = 12.1/180 x 100% = 6.67%
%O = 6.16/180 x 100% = 53.33%
What types of solutes are electrolytes when they dissolve in water to form solutions?
Since water does not have charged particles, water is a non-conductor. When some solutes dissolve in water they allow an electric current to flow through the water and the solution conducts electricity. These solutes are called electrolytes. ... Non-electrolytes like sugar dissolve to form molecules in solution.
