Answer:
B.9
Explanation:
Complete the three words. The oxidation state tells you how many electrons an atom has g....................... , l......................... , or s......................... , in forming a compound.
Answer:Gained, Lost , Shared
Explanation:
The oxidation state tells you how many electrons an atom has GAINED.................. , LOST....................... , or SHARED........................ , in forming a compound.
Oxidation state is defined as the the total number of electrons that an atom gains or loses when forming a chemical bond with another atom.
----To form an ionic bond for example in NaCl, Na, with 11 electrons and one valence electron in its outermost shell donates or lose that valence electron to Chlorine with 17 electron and 7 in its outermost shell. Therefore Sodium, Na acquires the +1 oxidaton state to become stable and Chlorine acquires the -1 oxidation state to become stable forming the NaCl compound.
To form a covalent compound, There must be sharing of electrons between atoms.For example, in PCl3, The phosphorous atom with atomic number 15 shares its three unpaired electrons with the single valence electrons of three chlorine atoms. making the four molecules to attain stability with Phosphorous having +3 and the chlorine atoms having -1 oxidation states
The way Earth's rotation makes winds curve.
Answer:
it is called the prevailing westerlies
Explanation:
5
What substance would do the best job of cleaning pots and
pans?
A
A substance with a pH of 7
B
A substance with a pH of 2
C
A substance with a pH of 4
D
A substance with a pH of 8
Answer:
D . A substance with a pH of 8
Explanation:
pH stands for "Potential for Hydrogen." This is an indicator of a solution's acidity or alkalinity. It is also used to tell which chemicals are great for cleaning.
pH 7 and pH 8 are both considered "neutral pH," thus, solutions with these pH are often used as dishwashing detergents because they do not destroy the surfaces of objects. However, pH 8 is said to be more alkaline in nature. This allows it to destroy the residues, such as fats and oils, in pots and pans. It is the pH of baking soda.
CAN SOMEBODY PLEASE HELP ME ANSWER THIS CORRECTLY?! (There’s only one option per term, I just really need help and I would appreciate it)
~TERMS~
1. Theory
2. Controlled
3. Variables
4. Hypothesis
5. Independent
6. Quantitative
~DEFINITIONS~
A.) a variable that stays the same during an experiment.
B.) All the things that can be tested and/or observed in an experiment.
C.) An explanation that best explains observable facts, has been well tested and is widely accepted.
D.) describing something using your senses.
E.) summary explaining whether or not the hypothesis was supported by the experimental results.
F.) the variable that changed after doing the experiment.
G.) the variable you choose to test.
H.) Using numbers or amounts to describe something.
I.) your prediction on how the experiment will turn out.
(Answer like 1a or 2b.) (I need answers for all 6 terms) if you help me, thank you like alot
Answer:
1: C
2: A
3: B
4: I
5: G
6: H
Explanation:
Please don't crucify me if I'm wrong ;-;
How does a rock
Wither? Explain.
First, it combines with carbon dioxide in the soil to form a weak acid called carbonic acid. ... Carbonic acid slowly dissolves away minerals in rock, especially the carbonate minerals that make up limestone and marble. The weak acid decomposes the insoluble rock into watersoluble products that move into the groundwater.
I need help pls Where does it belong to?
Two cars travel next to each other. One speedometer reads
20 meters per second and the other reads 72 kilometers per
hour. If arrows represent speed, which pair of arrows
represents the relationship of speeds of these two cars?
The blue arrow is always the 20 meters per second car.
PLEASE HELP
Answer:
The pair of arrows which represents the relationship of speeds of the two cars is;
The second option as shown in the attached drawing
Explanation:
The given parameters are;
The reading on the speedometer of one car = 20 m/s
The reading on the speedometer of the other car = 72 km/h = 20 m/s
The blue arrow = 20 m/s
Therefore, given that the speeds of both cars are equal (20 m/s = 72 km/h = 20 m/s), the pair of arrows that represent the relationship of speeds of the two cars is two equal length blue arrows which is the second option
The attached diagram showing the pair of arrows that represents the relationship of speeds of the two cars is drawn using Microsoft Visio.
1) Which electrons are involved in bonding between atoms?|
Answer:
VALENCE ELECTRONS are involved in the bonding of atoms
Explanation:
Hope that helps
Soil with high amounts of
_____ is acidic.
Magnesium
Potassium
Hydrogen Ions
Calcium
Answer:
C. Hydrogen Ions.
Explanation:
The pH level of soils is measured based upon the acidity or basicity level in the soil. The pH scale usually measures between 0-14. 7 is the neutral pH level of soil and a pH level below 7 is considered acidic and above 7 is alkaline.
So, soil with a high amount of hydrogen ions (H+) will be considered acidic. As the amount of hydrogen ions increases in the soil, the pH level of the soil decreases, making it acidic.
Therefore, option C is correct.
Approximately how long does it take for the moon's phases to change from a NEW moon to a FULL moon?
1 week
3 weeks
2 weeks
4 weeks
Answer:
4 weeks
Explanation:
It takes 4 weeks for the cyclle to be happening again
How many representative particles are 9.01 moles of water? (Make sure to write you answer in scientific notation.)
PLEASE HELP!!!!
Answer:
54.26 × 10²³ representative particles
Explanation:
Given data:
Number of moles of water = 9.01 mol
Number of representative particle = ?
Solution:
one mole of any substance contain 6.022 ×10²³ representative particles.
9.01 mol × 6.022 ×10²³ representative particles
54.26 ×10²³ representative particles
The number 6.022 × 10²³ is called Avogadro number.
"It is the number of atoms , ions , molecules or representative particles in one gram atom of element, one gram molecules of compound and one gram ions of a substance "
Increased human population will most likely have which consequence? *
A: decrease global warning
B: increase the use of fossil fuels
C: increase animal habits
D:replenish Fish species in our Ocean
Please help with my homework
Answer:
B its most likely sorry if im wrong :D :(
Explanation:
NaOH+HCL=NaCL+H2O
what is the total number of grams of h2o produced when 116 grams of the product NaCL is formed from 80 grams of NaOH and 72 grams of HCL?
A)9.0. B)18.o. C)36.0 D54g
How many grams of H2O2 will be produced if 14.86-grams of water is reacted with excess oxygen? How many molecules of H2O2 were produced?
2H2O (l) + O2 (g) ® 2H2O2 (aq)
Answer:
4.99 ×10²³ molecules
Mass = 28.22 g
Explanation:
Given data:
Mass of H₂O₂ produced = ?
Mass of water react = 14.86 g
Number of molecules of H₂O₂ produced = ?
Solution:
Chemical equation:
2H₂O + O₂ → 2H₂O₂
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 14.86 g/ 18 g/mol
Number of moles = 0.83 mol
Now we will compare the moles of water and H₂O₂.
H₂O : H₂O₂
2 : 2
0.83 : 0.83
Mass of H₂O₂:
Mass = number of moles × molar mass
Mass = 0.83 mol × 34 g/mol
Mass = 28.22 g
Number of molecules:
1 mole = 6.022×10²³ molecules
0.83 mol × 6.022×10²³ molecules / 1 mol
4.99 ×10²³ molecules
Which two compounds are used in batteries?
sulfuric acid and potassium hydroxide
ammonium hydroxide and nitric acid
potassium hydroxide and nitric acid
sulfuric acid and ammonium hydroxide
Answer:
The chemicals which are electrolytes include: Sodium chloride, chloric acid, nitric acid, potassium nitrate, hydrochloric acid, potassium nitrate, sulfuric acid, sodium hydroxide, magnesium hydroxide and sodium acetate.
Answer:
Sulfuric acid and potassium hydroxide.
Explanation:
These are the two compounds used in car batteries, hope this helps!
why do minerals only form in certain areas?
Answer:
Often, chemical changes in the water might result in the release of different minerals such as salt or calcium carbonate. Pressure and heat in the process of creating metamorphic rock can also result in the formation or transformation of minerals. Minerals in igneous rocks often form where magma has cooled over time.
Explanation:
Minerals only form in certain areas due to presence of specific environment.
Minerals only form in certain areas because of the presence of suitable environmental condition for it. Every mineral needs specific environment for its formation. Without that specific temperature, pressure and some other factors, the mineral can't formed.
Every mineral needs specific environment for its formation which is different from one another so we can conclude that mineral formation needs particular environmental conditions.
Learn more: https://brainly.com/question/21076968
Which type of combination is a mixture?
A.
electrical
B.
chemical
C.
physical
D.
thermal
Answer:
C. physical
Explanation:
A mixture is a physical combination. Mixtures are combinations of compounds and molecules without any chemical reaction taking place.
Mixtures have the following properties:
They have an indefinite composition i.e they consist of two or more elements and or compounds in any proportion by massTheir constituents retains their identities i. e physical property is retained. Their constituents reacts differently to changed conditions. They are easily separated into constituents by physical methodsIn what ways might the Ring of Fire have
changed in shape and size throughout time?
Explanation:
this question tion is so hard sorry but I can't do is sorry
A chemist is studying the properties of a gas under various conditions. He observes that when the gas is at room temperature and low pressure, it behaves as an ideal gas. When the gas is cooled to 10 kelvin and is placed under high pressure, however, it deviates significantly from an ideal gas. Explain these observations
Answer:
An ideal gas is a theoretical concept and a real gas behaves in an ideal manner under conditions which includes a high temperature and a low pressure such that the gas has high kinetic energy, and the intermolecular forces between the molecules are weak
The Ideal Gas Law is P·V = n·R·T
Where;
P = The pressure of the gas
V = The volume of the gas
n = The number of moles of the gas
R = The Universal Gas Constant
T = The temperature of the gas
For a gas cooled to 10 Kelvin and placed under high pressure, the interaction between individual gas molecules increases, and the kinetic energy of the gases is much lower and more comparable to the inter molecular forces between the gas molecules, which in turn produces observable changes from the initial ideal behavior of the gas such that the gas behavior deviates from the Ideal Gas Laws appreciably and are better modelled by the Van der Waals Equations which takes into account, the volume the gas particles occupy and the intermolecular forces between the molecules
The Van der Waals equation is presented as follows;
[tex]P = \dfrac{R \cdot T}{V - b} - \dfrac{a}{V^2}[/tex]
Where;
V = The molar volume
a = The gas constant a represents the attractive forces between the gas particles
b = Represent the volume occupied by the particles of the gas
Explanation:
Answer: A, B, & C
Explanation:
A. The ideal gas model assumes that gas particles experience no intermolecular attractions and these forces cause the gas to deviate from ideal behavior.
B. At very low temperatures, gas particles move slowly.
C. At very high pressures, gas particles are very close together.
Got it right on edge :)
A very specific procedure scientists follow when conducting experiments is known as the
Answer:
Scientific Method.
Explanation:
A scientific method is basically a method or a process when you conduct an experiment. Normally, the process goes like this:
1. You make like a question or something that you want to investigate, it's like the aim of the experiment.
2. You make an experiment and a hypothesis. A hypothesis is basically a guess on how the results of the experiment would turn out. You don't have to be correct for the hypothesis since there is no right or wrong answer.
3. Conduct the experiment. I don't think this needs a detailed explanation since experiments vary from one another.
4. Collect results. The data you collect come in different ways based on your experiment, but it is crucial you get data so that you can answer your question in 1.
5. Make inferences. You can't directly get a conclusion or answer from the results, so inferences are needed.
6. Craft a conclusion or answer. This is the final step when conducting an experiment and the part where you have the answer you needed when you conducted the experiment :)
Please help me it’s due tmrw
1. In this section, you read about firefighters cleaning
up a hazardous spill of a base. This is the chemical
reaction they used:
H3PO4 + 3 KOH → K3PO4 + 3 H2O
(a) What type of reaction is this?
(b) Write the general equation for this kind of
reaction. Compare the equation above with the
general equation.
(c) Name the reactants
D) Name the products
a. double replacement
b. AB + CD ⇒ AD +CB
c and d
H₃PO₄ : Phosphoric acid
KOH : Potassium hydroxide
K₃PO₄ : Tripotassium phosphate
H₂O : water
Further explanationGiven
Reaction
H₃PO₄ + 3 KOH → K₃PO₄ + 3 H₂O
Required
Type of reaction
General equation
Name of reactants and product
Solution
Type of reaction :Double replacement reaction : Cations and anions of different compounds switch places
It can also be said as a neutralization reaction because it produces water(reaction between an acid and a base)
General equation :AB + CD ⇒ AD +CB
Name of reactants and productsH₃PO₄ : Phosphoric acid
KOH : Potassium hydroxide
K₃PO₄ : Tripotassium phosphate
H₂O : water
How many atoms are in 6.3 moles of lead
Answer:
3.79 x 10²⁴atoms
Explanation:
Given parameters:
Number moles of lead = 6.3moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem,
1 mole of a substance contains 6.02 x 10²³ atoms
6.3 mole of Pb will contain 6.3 x 6.02 x 10²³ = 3.79 x 10²⁴atoms
How many moles of carbon dioxide (CO2) does 250 grams of the substance have? How many
molecules of CO2 are there? The molar mass of CO2 is 44.01 g/mol.
Explanation:
Given parameters:
Mass of carbon dioxide = 250g
Molar mass of carbon dioxide = 44.01g/mol
Unknown:
Number of moles of carbon dioxide = ?
Number of molecules of carbon dioxide = ?
Solution:
We first find the number of moles of carbon dioxide;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Number of moles = [tex]\frac{250}{44.01}[/tex] = 5.68moles
From mole concept;
1 mole of a substance contains 6.02 x 10²³ molecules
5.68 mole of carbon dioxide will contain 5.68 x 6.02 x 10²³
= 3.42 x 10²⁴molecules
How many moles of sand (SiO2) are in 30 g of sand?
0.50 mol SiO₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableUsing Dimensional AnalysisExplanation:Step 1: Define
30 g SiO₂ (sand)
Step 2: Identify Conversions
Molar Mass of Si - 28.09 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of SiO₂ - 28.09 + 2(16.00) = 60.09 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 30 \ g \ SiO_2(\frac{1 \ mol \ SiO_2}{60.09 \ g \ SiO_2})[/tex]Multiply/Divide: [tex]\displaystyle 0.499251 \ mol \ SiO_2[/tex]Step 4: Check
Follow sig figs and round. We are given 2 sig figs.
0.499251 mol SiO₂ ≈ 0.50 mol SiO₂
Answer:
[tex]\boxed {\boxed {\sf About \ 0.5 \ moles \ of \ SiO_2}}[/tex]
Explanation:
To convert from grams to moles, we must use the molar mass.
1. Molar Mass
Use the Periodic Table to find the masses of the individual elements (silicon and oxygen) in sand.
Silicon (Si): 28.085 g/mol Oxygen (O): 15.999 g/molExamine the formula for sand: SiO₂. There is a subscript of 2 after oxygen, so there must be 2 oxygen atoms. Multiply oxygen's mass by 2 and add silicon's mass to find the molar mass of sand.
SiO₂: 2(15.999 g/mol) + 28.085 g/mol= g/mol2. Calculate Moles
Use the molar mass as ratio.
[tex]\frac{60.083 \ g \ SiO_2}{1 \ mol \ SiO_2}[/tex]
Multiply by the given number of grams (30)
[tex]30 \ g \ SiO_2 * \frac{60.083 \ g \ SiO_2}{1 \ mol \ SiO_2}[/tex]
Flip the fraction so the grams of sand will cancel.
[tex]30 \ g \ SiO_2 *\frac{1 \ mol \ SiO_2}{60.083 \ g \ SiO_2}[/tex]
[tex]30 *\frac{1 \ mol \ SiO_2}{60.083 }[/tex]
[tex]\frac{30 \ mol \ SiO_2}{60.083 }[/tex]
[tex]0.499309289 \ mol \ SiO_2[/tex]
3. Round
The original measurement of grams has 1 signfiicant figure. We must round our answer to 1 sig fig.
For the answer we found, that is the tenth place. The 9 in the hundredth tells us to round the 4 to a 5.
[tex]\approx 0.5 \ mol \ SiO_2[/tex]
There are about 0.5 moles of SiO₂ in 30 grams.
How many grams of hydrogen peroxide are needed to produce 1.30 moles of oxygen gas?
2H2O2=2H2O+O2
Answer:
12.736 grams of hydrogen peroxide
Explanation:
You are running late to school and need to go 1,500 m in 10 minutes. What speed will you travel?
10 m/min
15 m/min
150 m/min
O 1 m/min
Answer:
15 m/min
Explanation:
You take the 1500 divide by 10 and your answer is 15
This chemical equation represents a chemical reaction H2SO4 + 2LiOH Li2SO4 + 2H2O which two chemicals are the products of the chemical reaction shown?
Answer:
Lithium sulphate (Li₂SO₄) and water (H₂O
Explanation:
H₂SO₄ + 2LiOH —> Li₂SO₄ + 2H₂O
The equation represented above indicates a neutralization reaction.
A neutralization reaction is a reaction involving acid and base which result in the production of salt and water.
In the equation above,
Reactant:
H₂SO₄ (acid)
LiOH (base)
Product:
Li₂SO₄ (salt)
H₂O (water)
Thus, lithium sulphate (Li₂SO₄) and water (H₂O) are the products of the reaction
Magnetic Field
What is a magnetic field?
Answer:
a region around a magnetic material or a moving electric charge within which the force of magnetism acts. hope it helps :)
Answer:
is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials
Explanation:
What are half-reactions?
O A. Equations showing which elements are oxidized and which are
reduced
O B. Equations showing the electronegativities of atoms in a reaction
O C. Equations showing what compounds are involved in a reaction
O D. Equations showing only the ions involved in a net ionic equation
Answer:
A
Explanation:
A Equations showing which elements are oxidized and which are
Answer:
A.
Explanation:
Equations showing which elements are oxidized and which are
reduced
Describe how an adaptation may have allowed giraffes to survive in savanna ecosystems