Answer:
Does it question provide the volume? To find density you need to divide the mass by the volume (d=m/v).
Explanation:
Oxidation number for H+
Answer:
+1
The oxidation state of H+ = +1. The Oxidation state of Zn2+ = +2. The oxidation state of H2 = 0. The sum is equal to zero because there are 2 H+ ions.
Explanation:
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:
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:
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 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!
How does the bond formed determine the physical and chemical characteristics of the compounds and molecules formed?
I'm pretty sure we have the same class (I go to FL), because I have the same problem, and it was assigned the day you posted this, so I can't give a full answer but important things would be conducting electricity, solubility, flexibility, shape, and geometries. Sorry I can't be of more help!
Which of these are highest in fat?
Almonds
Butter
Sesame oil
Answer:
almonds and sesame oil have the same amount of fat.
Explanation:
Almonds: 14 g
Butter: 12 g
Sesame Oil: 14 g
A log has a density of .8 g/cm³. What will happen to this log in freshwater, which has a density of 1.0 g/cm³?
It will sink.
It will float.
It will move deeper.
It will decrease in density.
Answer:
The log will float on the water because its density is lower than the liquid, so it will stay at the top due to Archimedes' principle.
Answer:
B: It will float.
Explanation:
on edge2021! hope this helps!!~ (=^▽^=)
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:
........................................
The term that refers to how much of a solute can be dissolved is
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.
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
The melting points for the compounds Li2S, Rb2S, and K2S are 900, 500, and 840 degrees C, respectively. Give the three compounds in order of increasing lattice energy
Answer: [tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]
Explanation:
Lattice energy is the energy required to dissociate 1 mole of the an ionic compound into its constituent ions.
Thus higher is the lattice energy more energy will be required to melt the compounds.
As [tex]Li_2S[/tex] has highest melting point, it will require most energy to melt an hence it will have highest lattice energy. The order of three compounds in order of increasing lattice energy
[tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]
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:
https://brainly.com/question/7558603
#SPJ2
Stoichiometry is the branch of chemistry that deals with elements in
compounds and with reactants and products in chemical reactions,
focusing on.
a. bonding
b. energy transfers
c. mass relationships
d. physical characteristics
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.
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
please help on question 7 and 8
Answer:
7. 5km/h
8. 10km/h
I just need to add characters so i can post
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..!
What are 2 reasons molecules cannot pass easily through the cell membrane? What part of the cell membrane helps them get through?
Answer:
The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot. A concentration gradient is a just a region of space over which the concentration of a substance changes, and substances will naturally move down their gradients, from an area of higher to an area of lower concentration.
In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.
Explanation:
there are your two reasons molecules cannot pass easily through the cell membrane and what part of the cell membrane helps them get through is concentration gradient
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:
Hope you like it
The speed of a water wave is 6.2 meters/sec. Its wave length is 0.50 meters. What is its frequency, cycles/see?
a. 0.080
b. 12.0
c. 3.10
d. 4.60
e. 0.0806
Answer:
e is right ▶️▶️▶️▶️▶️▶️▶️
A compound contains 64.3% carbon, 7.14% Hydrogen, and 28.6% Oxygen. What is the empirical formula for this substance?
Оа
C₂H₂O
Oь
C9H₂O2
Ос
C₂H₂O
Od
CHO
Answer:
Empirical formula is C₃H₄O
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number .
Given data:
Percentage of hydrogen = 7.14%
Percentage of carbon = 64.3%
Percentage of oxygen = 28.6%
Empirical formula = ?
Solution:
Number of gram atoms of H = 7.14 / 1.01 = 7.1
Number of gram atoms of O = 28.6 / 16 = 1.8
Number of gram atoms of C = 64.3 / 12 = 5.4
Atomic ratio:
C : H : O
5.4/1.8 : 7.1/1.8 : 1.8/1.8
3 : 4 : 1
C : H : O = 3 : 4 : 1
Empirical formula is C₃H₄O.
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.
Give an example of number 14 in real life?
Answer:
im 14 years old.
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
How many moles of bromine gas are produced
when fluorine reacts with 347.5 g of potassium
bromide?
Answer:
1.46 mol
Explanation:
Given data:
Moles of bromine gas produced = ?
Mass of potassium bromide = 347.5 g
Solution:
Chemical equation:
2KBr + F₂ → 2KF + Br₂
Number of moles of KBr:
Number of moles = mass/ molar mass
Number of moles = 347.5 g/ 119.0 g/mol
Number of moles = 2.92 mol
Now we will compare the moles of KBr and bromine.
KBr : Br₂
2 : 1
2.92 : 1/2×2.92 = 1.46 mol
Which components of a galaxy move in circular patterns or revolve around a star?
A:Gas
B: Dust
C:Other orbiting objects
D: Sun
Answer:
B
Explanation: hoped this helped!!!
Answer:
it is c no cap
Explanation: C
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
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.
