Answer:
9.033 × 10²³ molecules
Explanation:
Given data:
Mass of oxygen = 48.0 g
Number of molecules = ?
Solution:
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 48.0 g/ 32 g/mol
Number of moles = 1.5 mol
Avogadro number:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ molecules
1.5 mol × 6.022 × 10²³ molecules / 1mol
9.033 × 10²³ molecules
A system does 125 J of work and cools down by releasing 438 J of heat. The change in internal energy is ____________ J.
Given that,
Work done by the system = 125 J
Energy released when it cools down = 438 J
To find,
The change in internal energy.
Solution,
As heat is released by the system, Q = -438 J
Work done by the system, W = -125 J
Using the first law of thermodynamics. The change in internal energy is given by :
[tex]\Delta U=Q-W\\\\=-438-125\\\\=-563\ J[/tex]
So, the change in internal energy is 563 J.
how many liters are in 20 grams of hydrogen gas?
[tex]\huge\bold{\mathfrak{\purple{A{\pink {n {\green {s{\blue{w{\red{e {\orange {r}}}}}}}}}}}}}[/tex]
Volume of 20 g of hydrogen at normal temperature and pressure (NTP) = 240.55 ml.
[tex]\huge\sf\underline{\underline{\red{❥︎ Thanks}}}[/tex]
Atoms was determined to be 143 picometers. What is the percent error of this measured value?
Answer:
9.1% error
Explanation:
Full Question:
A measured value for the atomic radius of platinum atoms was determined to be 143 picometers. What is the percent error of this measured value?A diagram represents the life cylce of a frog. The diagram shows that, in a frog...
1) methods of sexually reproduction depends on the species
2) metabolism is the sum of all chemical reactions
3) body structures change during development
4) Offspring always look like the adult
PLEASE HELP AND ANSWER
Answer:
I think 1 option ok basically I am a scientist
Answer:
(3)
Explanation:
The scientific method is a that can be used to answer any . The process begins when a scientist makes an . Then, they do to learn more about the topic and write a . The scientist will and conduct an , eventually coming to a . They will share their with other scientists to help further discovery
Answer:
The scientific method is a process that can be used to answer any questions . The process begins when a scientist makes an observation. Then, they do research to learn more about the topic and write a hypothesis. The scientist will make predictions and conduct an experiment, eventually coming to a conclusion. They will share their results with other scientists to help further discovery.
Explanation:
The Scientific method is process used to observe, predict and explain phenomena around us. It involves a series of steps listed as follows:
1. Making observations: the scientist must be a keen observer of events around him
2. Ask questions: the scientist asks questions based on the observations
3. Form a hypothesis and make predictions: the scientist puts forward a reasonable explanation for the observations known as hypothesis. Predictions are then made and tested upon.
4. Experimentation: experiments are conducted to test the hypothesis and the predictions made.
5. Analysis of data and conclusion: the result of the experiments are analysed and conclusion are then drawn.
6. Communication of results: the results obtained from the experiments are then shared with other scientists to aid further research and discoveries.
Usually the number of protons matches the number of?
Answer:
Electrons
Explanation:
can u please answer this for me
Answer:
answer c
Explanation:
A. 207 kJ
B. 4730 kJ
C. 9460 kJ
D. 414 kJ
Answer:
[tex]\boxed {\boxed {\sf C. \ 9460 \ kJ}}[/tex]
Explanation:
The formula we must use is given to us:
[tex]q=mL_{vapor}[/tex]
q is the energy, m is the mass, and L(vapor) is the latent heat of vaporization.
The energy is what we calculate and the mass is 2 kilograms. We need to find the latent heat of vaporization, which is on the table.
We know the sample is copper. Find that element on the table, then the third box tells us it's latent heat of vaporization is 4730 kJ/kgNow we know:
[tex]m= 2 \ kg \\L_{vapor}=4730 \ kJ/kg[/tex]
Substitute the values into the formula.
[tex]q=(2 \ kg ) * (4730 \ kJ/kg)[/tex]
Multiply. Note that the kilograms (kg) will cancel each other out.
[tex]q= 2* 4730 \ kJ[/tex]
[tex]q= 9460 \ kJ[/tex]
9460 kilojoules are required to vaporize 2 kilograms of copper.
Which properties do all solids share?
A. Color and fixed shape
B. Color and fixed volume
C. Fixed volume and fixed shape
D. Fixed shape; volume that depends on container
Answer:
c
Explanation:
because when you hold a solid in your hand does it move does it shift no it stays the same so it doesn't take the form of the container it's in cuz that's a liquid.
Which factors Cause Earth to experience seasons? Check all that apply
Answer:
what are the options to the question
Answer:
b and c
Explanation:
just took it on edge :)
What contribution did Niels Bohr make to atomic theory
Answer:
Bohr's greatest contribution to modern physics was the atomic model. The Bohr model shows the atom as a small, positively charged nucleus surrounded by orbiting electrons.
Explanation:
Answer: He proposed a theory for the hydrogen atom based on quantum theory
Explanation:
In your home, you can turn off your television set but all of your other appliances will stay on. This is because the appliances in your home are connected *
in series
in parallel
Well
Together
Answer:
in parallel
Explanation:
All of the home equipment in the residence are linked in parallel.
Are domestic appliances linked in collection or parallel?parallel association
electric appliances are connected in a parallel arrangement in a house circuit because every appliance gets complete voltage as resistance in a parallel association is low.
Why are electrical appliances in our household no longer connected in collection?electric appliances are not linked in series because the cutting-edge can be the same thru all the home equipment connected but voltage increases if extra no. Of appliances are related. If the battery has low voltage than the full voltage it can short circuit.
research greater approximately the parallel.
Learn more about parallel circuit
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Elements that are most similarities are located in the same...?
Answer: In the same Group
Explanation: Elements in the same group (row going down) have the same number of valance electrons. These valance electrons dictate their chemical properties and how they react with other elements/compounds.
Caleb is an inventor who has designed a new kind of fishing net. He is looking for a strong, flexible material that can be used to hold a lot of weight and will not dissolve in water. He wants a synthetic material so he does not have to depend on harvesting a natural product.
NEED CORRECT
Which material would be best for Caleb’s invention?
cellulose
nylon
polystyrene
vulcanized rubber
Answer:
Its B Nylon
Explanation:
i just took the quiz and got it right.
Answer:
nylon
Explanation:
nylon is a common material used for nets and it is strong
From the formula, write the correct name for the ionic compound. MgBr₂ KCl Al₂S₃ BeCl₂ MgCl₂ GaN CaO BaO AgBr 10. NaF SrS LiCl AlP CsI
Explanation:
For binary ionic compound, the compound is named by first writing the cation followed by the anion. The names of the compounds are;
MgBr₂ - Magnesium Bromide
KCl - Potassium Chloride
Al₂S₃ - Aluminium Sulphide
BeCl₂ - Berylium Chlride
MgCl₂ - Magnesium Chloride
GaN - Gallium Nitride
CaO - Calcium Oxide
BaO - Barium Oxide
AgBr - Silver Bromide
NaF - Sodium Flouride
SrS - Strontium Sulphide
LiCl - Lithium Chloride
AlP - Aluminium Phosphide
CsI - Caesium Iodide
Ralph wanted to breed a pea plant that produced only purple flowers. He continued to breed purple-flowers producing pea plants together over six generations. The results of Ralph's artificial selection are shown above. What did artificial selection do the population of pea plants?
Answer:
B
Explanation:
Number of purple flowers
Number of white flowers
1
705
224
2
792
189
3
834
102
4
889
84
5
938
21
6
952
0
Ralph wanted to breed a pea plant that produced only purple flowers. He continued to breed purple-flower producing pea plants together over six generations. The results of Ralph's selective breeding are shown above. What did the selective breeding do to the population of pea plants?
A. increased its genetic diversity
B. decreased its genetic diversity
C. caused a new species of pea plant to form
D. caused a pea plant to exhibit a new characteristic
The correct answer would be that selective breeding decreased the genetic diversity of the population of the pea plants.
The genetic diversity of a population can be viewed as the number of genes in the gene pool of the population.
With each successive generation, more purple-flowered and less white-flowered pea plants were being produced until the 6th generation when only purple-flowered pea plants were produced. The ratio of the purple color gene to that of white color kept increasing until there was no longer a white color gene in the population. Hence, the genetic diversity of the population was decreased by the selective breeding.
The correct option is B
A block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 g. From this information, calculate the mass, volume and density.
Answer:
mass = 78 grams
volume= 2*5*6=60cm^3
density =m/v
=78/60
13/10=1.3 g/cm^3
Explanation:
The mass of the block of metal would be 780 grams
The volume of the block of metal would be 60 centimeter³
The density of the block of the metal is 13 g/cm³
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
The density is the reciprocal of the specific volume of any substance.
ρ =m /v
As given in the problem a block of metal has dimensions of 2 cm by 5 cm by 6 cm. The block weighs 780 grams
The volume of the block of metal would be = 2×5×6 centimeter³
= 60 centimeter³
The mass of the block of metal = 780 grams
ρ =m /v
ρ = 780 /60 gram/ cm³
ρ = 13 g/cm³
Thus, the mass volume and the density of the block of the metal would be 780 grams , 60 centimeter³, and 13 g/cm³ respectively.
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3. Write the equation for the reaction of metal with oxygen and non metal with oxygen and then
predict the nature of the substance formed when the oxide of metal and oxide of non metal is
dissolved in water.
Answer:
Acidic Oxides: Acidic oxide are oxides that react with water to form an acid. Acidic oxides are formed by reaction of non metals with oxygen .
[tex]S+O_2\rightarrow SO_2[/tex]
[tex]SO_2+H_2O\rightarrow H_2SO_4[/tex]
Basic Oxides: Basic oxides are oxides that react with water to form bases. Basic oxides are formed by reaction of metals with oxygen.
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
[tex]MgO+H_2O\rightarrow Mg(OH)_2[/tex]
what are two atoms if hydrogen?
Answer:
ummm molecules i have no idea- i tried tho..
Explanation:
is known as a diatomic element hydrogen is the lightest element has an atomic number of one uses the symbol H at standard temperature and pressure hydrogen is an odorless and colorless gas it is combustible and produces water when it burns in air hydrogen is also the most abundant element in the universe with 90% of atoms in the universe being made of hydrogen main sequence Stars such as the sun burn hydrogen as fuel
Explain why it is important for cells to exchange materials.
Answer:
they need the exchange so they can grow, obtain energy, and get rid of waste. It also helps to mantian a balance of amterials in the cell.
Explanation:
The temperature of 15 grams of water is increased by 3.0 Celsius degrees. How much heat was absorbed by the water? (specific heat of water: 4.18 J/g deg C)
Answer:
188.1J
Explanation:
obtained from Q=MCT
what has 9 protons and -1 charge? PLEASE HELP ME
Fluorine, I still remember this from my science fair
help me pleaseee, if you do tyy :)
What are the reactants in a chemical equation located? (20 Points)
A. On the right side of the arrow
B. Below the arrow
C. Above the arrow
D. On the left side of the arrow
on the left side of the arrow
The reactants in the chemical equation located on the left side of the arrow. Option D is correct.
The arrow in the chemical equation represents the direction of the chemical reaction, and it separates the reactants from the products.
A chemical equation is a symbolic representation of a chemical reaction, showing the starting materials (reactants) and the resulting substances (products). The general form of a chemical equation is as follows:
Reactants → Products
Reactants: The reactants are the substances present at the beginning of the chemical reaction. They are the starting materials that undergo a chemical change or reaction to produce new substances. Reactants were written on the left side of the arrow.
Arrow: The arrow in the chemical equation points from the reactants to the products, indicating the direction of the reaction. It symbolizes the transformation of reactants into products during the chemical reaction.
Products: The products are the substances formed as a result of the chemical reaction. They are the new compounds or elements that are produced by rearranging the atoms of the reactants. Products were written on right side of the arrow.
For example, let's consider the combustion of methane (CH₄) in oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O):
CH₄ (methane) + 2 O₂ (oxygen) → CO₂ (carbon dioxide) + 2 H₂O (water)
In this chemical equation, methane (CH₄) and oxygen (O₂) are the reactants, and they are located on the left side of the arrow. The products, carbon dioxide (CO₂), and water (H₂O), are located on the right side of the arrow.
Hence, D. is the correct option.
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What colour will red litmus paper turn if calcium hydroxide and water reacted?
do you want me to try it?
Answer:
Explanation:
blue for base.
Red for ____. What it goes red when in an acidic compound (like coke or pepsi).
So Ca(OH)2 is a base. That means it will turn blue.
The belief that you lose fat mass in a specific body part by concentrating exercise in that area is known as:
Answer:
Targeted fat loss
Explanation:
Answer:
Spot reduction
Explanation:
<3
determine the energy associated with an e- in hydrogen at n=2 to n=4
Answer:
Kinetic energy of electron = -E₂ = 3.4 ev
Kinetic energy of electron = -E₄ = 0.85 ev
Explanation:
In case of hydrogen atom energy associated with nth state is,
En = -13.6/n²
For n = 2
E₂ = -13.6 / 2²
E₂ = -13.6/4
E₂ = -3.4 ev
Kinetic energy of electron = -E₂ = 3.4 ev
For n = 4
E₄ = -13.6 / 4²
E₄ = -13.6/16
E₄ = -0.85 ev
Kinetic energy of electron = -E₄ = 0.85 ev
The sun produces energy in its ____ through the process of nuclear ____ ?
Answer:
Power and Nuclear Fision
Select all the correct answers.
In this reaction, how does the rate of forward reaction vary with the concentration of the product?
2H,S() =2H() + S(g)
O It increases with an increase in the concentration of S-(g).
OIt decreases with a decrease in the concentration of H().
OIt increases with a decrease in the concentration of H-(g).
It decreases with an increase in the concentration of S,().
It decreases with increase in the concentration of Ha().
The correct answers :
It increases with a decrease in the concentration of H₂(g).
It decreases with an increase in the concentration of S₂(g).
It decreases with an increase in the concentration of H₂(g).
Further explanationForward reaction : rate to form product
In equilibrium :
The product decreases ⇒ system will move from left to right(forward reaction)
The product increases ⇒ system will move from right to left(reverse reaction)
22
Silicon(IV) oxide is a covalently bonded compound.
Which statements are correct?
1
2
Silicon atoms form four single bonds in silicon(IV) oxide.
Oxygen atoms form two double bonds in silicon(IV) oxide.
Silicon(IV) oxide has a high melting point.
Silicon(IV) oxide contains one silicon atom and four oxygen atoms.
3
4
с
D
2 and 3 only
3 and 4 only
B
1 and 3 only
1 and 2 only
А
А
Answer:
Oxygen atoms form two double bonds in silicon(IV) oxide.
Silicon(IV) oxide has a high melting point.
Explanation:
Silicon dioxide is structurally analogous to carbon dioxide in the sense that it also contains two oxygen atoms that are double bonded to silicon the central atom in the molecule.
Silicon dioxide has a very high melting point of about 1710 degrees centigrade because of its large macromolecular structure which requires much energy to break such intermolecular interactions.