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
1. What happens when an electric current is applied to a tube filled with a gas, like neon, electrons...
Answer:
When an electric current is passed through a gas, the gas emits light. Neon signs operate in this way; a tube having an electrode at each end is filled with a gas at low pressure and a high voltage (generally in the range of 1000 to 5000 volts) is applied to the electrodes.
Explanation:
1. Calculate the RFM of Fe(NO3)2
Answer:
The Relative Formula Mass of Fe(NO₃)₂ is 179.8524 grams
Explanation:
The Relative Formula Mass is the mass of one mole of a compound expressed in grams, obtained by adding together the Relative Atomic Masses, RAM, of the elements which makes the compound
The Relative Formula Mass of a compound is the same as its Relative Molecular Mass
The relative formula mass of Fe(NO₃)₂ is given as follows;
The relative atomic mass of Fe = 55.845 amu
The relative atomic mass of nitrogen, N = 14.0067 amu
The relative atomic mass of oxygen, O = 15.999 amu
Therefore, we have;
The formula mass of Fe(NO₃)₂ = (55.845 + 2×(14.0067 + 3×15.999)) amu = 179.8524 amu
The Relative Formula Mass of Fe(NO₃)₂ = 179.8524 grams.
a compound has hydrogen ion and nitrate ion in solutionstate what is the name of that compound
Answer:
This compound is HNO2
Explanation:
HNO2 ----> H+ + NO2
When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.
What is chemical formula?
Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.
Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.
Therefore, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.
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A model that describes the formation, ______________, and reformation of rocks.
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 "
what part of the atom determines what kind of reaction an element will have ?
A 1,600-milliliter bucket of paint is at a temperature of 70°F. Then the paint is divided equally into four smaller buckets. Each bucket is at 70°F before the paint is poured.
the temperature of each 400 milliliter bucket is about _____ the temperature of the original bucket of paint.
a.the same as
b.four times
c.one fourth
science
Answer:
a.the same as
Explanation:
The temperature of each 400mL bucket is about the same as the temperature of the original bucket of paint.
This is because the temperature of the paint inside the bucket is not dependent on the amount of paint present.
In this regard, the temperature is an intensive property. So each of the boxes will have a temperature that is the same as that of the original bucket. Each of the particles have the same amount of kinetic energy.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.
What is natural selection help plz help
Answer:
Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, the change in the heritable traits characteristic of a population over generations.
Explanation:
Hope this helps! Please consider marking brainliest! I hope you have an amazing day. Always remember, your smart and you got this! -Alycia :)
Answer:
Natural selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
Explanation:
What is an everyday example of covalent bonds and ionic bonds
Answer:
1. CARBON DIOXIDE- it is a covalent compound, which is used in soft/cold drinks and some other fluids as well , and use it in daily life.
2. HYDROGEN MONOXIDE- it is the normal or original or pure water which we drink everyday in our daily life and it is very important for our survival
Explanation:
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!
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:
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 ;-;
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.
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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
Build Carbon (6 red protons, 6 grey neutrons, 6 blue electrons) How many
neutrons could an isotope of carbon have?
A. 5
B. 6
C. 7
Answer:
B. 6
Explanation:
Isotope given:
¹⁴₆C
In specie written as this;
Superscript = Mass number
Subscript = Atomic number
To find the protons, it is the same as the atomic number;
Protons = Atomic number = 6
Neutrons have no charges;
Neutrons = Mass number - Atomic number =
Neutrons = 14 - 6 = 8
The number of electrons is the same as the atomic number = 6
can the element oxygen form a molecule O² . interpret why so
Answer:
Yes, it can
Find the explanation below
Explanation:
A molecule is a substance made up of more than one atom. Most times, the individual atoms of elements are UNSTABLE, hence, their atoms get chemically bonded to one another to form a MOLECULE.
Oxygen is an element denoted by the symbol O. Oxygen is made up of atoms that becomes chemically joined together via covalent bonds i.e each atom of oxygen shares their valence electrons, to form OXYGEN MOLECULE (O2). Oxygen molecule is referred to as a diatomic molecule because it is made up of two of the same atoms.
What is a lone pair?
A. Two pairs of electrons that form a double bond
B. Two atoms that have been pushed close to each other
C. A pair of electrons that is not used in bonding
D. A diatomic molecule attracted to no other molecule
Answer:
I BELIEVE IT is c.
Explanation:
"During germination, the fertilized egg begins to sprout and grow. Each seed contains an embryo, or tiny plant, and it needs the right condition to grow. These conditions include the basic need of water, the correct temperature, and the right location, which is in the soil."
Answer:
See the answer below
Explanation:
Read the following passage and identify the error. During germination, the fertilized egg begins to sprout and grow. Each seed contains an embryo, or tiny plant, and it needs the right condition to grow. These conditions include the basic need of water, the correct temperature, and the right location, which is in the soil. Select the statement that corrects the error in the passage. Seeds are fertilized during germination, not before. Basic conditions include wind, not water. The fertilized egg begins to grow and mature, not an embryo. The fertilized seed begins to grow and sprout, not an egg.
A typical seed consists of a fertilized ovule which forms the embryo. Double fertlization ensures that a structure, the endosperm, surrounds and provide nutrition to the embryo while in a state of inactivity.
During germination, the embryo sprouts and grows given the right conditions of moisture, air, temperature, and other factors that may vary from seeds to seeds.
Explain why the answer is correct and why the others aren’t.
Please and thank you
Answer:
B. bedrock structure.
Explanation:
A landform refers to a geomorphic or natural feature of the Earth's surface, which typically makes its terrain. Some examples of landforms on planet earth are mountain, plains, valley, hills and plateau.
Basically, the tectonic plates such as the oceanic and continental lithosphere interact in three (3) ways and these are; divergent, transform and convergent boundaries.
A convergent plate boundary can be defined as a boundary where two (2) plates move towards each other, usually, resulting in subduction or collision. This action often causes mountain range such as the Himalayas to form by the collision between the plate carrying Eurasia and that of India; as a result of subduction which causes a plate to be forced underneath the mantle, deep ocean trenches are formed such as the Mariana trench.
The Catskills are commonly called mountains but are actually part of the Allegheny Plateau also referred to as Appalachian Plateau. The Catskills are classified as a plateau because of their bedrock structure which is caused by a valley, continental glaciers, and erosion from various watercourse.
Additionally, the Catskills is a mountain which got its name from early Dutch settlers in the United States of America.
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.
The way Earth's rotation makes winds curve.
Answer:
it is called the prevailing westerlies
Explanation:
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:
The electron configuration for nitrogen is 152 2s22p3. When N2 forms,
how does each nitrogen atom fulfill the octet rule?
Answer:
N2 has a triple bond with its Lewis structure. Nitrogen has 5 valence electrons. Two nitrogen's have a total of 10 valence electrons. There will be 6 valence electrons that are unequally shared. We move them in the middle. Therefore, Each nitrogen gives three pairs of electrons to the to the other nitrogen atom. N2 has a total of 8 electrons which completes the octet rule.
Explanation:
Hope it helped!
Describe how an adaptation may have allowed giraffes to survive in savanna ecosystems
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
What is the molecular formula of a compound that molecular mass of 54 g/mol and an empirical formula of C₂H₃? C₂H₃, C₄H₆, C₆H₉, C₈H₁₂
Answer:
Molecular formula = C₄H₆
Explanation:
Given data:
Molecular mass of compound = 54 g/mol
Empirical formula = C₂H₃
Molecular formula = ?
Solution:
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
Empirical formula mass = 12×2 + 3×1 = 27 g/mol
n = 54 / 27
n = 2
Molecular formula = n (empirical formula)
Molecular formula = 2(C₂H₃)
Molecular formula = C₄H₆
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