Answer:7.229 grams of oxygen is formed by the complete reaction of 35.23 g of metallic sodium with oxygen at 130–200 °C, a process that generates sodium oxide, which in a separate stage absorbs oxygen: 4 Na + O2 → 2 Na2O. The ozone oxidizes the sodium to form sodium peroxide.
Someone pls help me I will make you brain
Answer:
Lung function decreses at a faster rate for young people (last answer choice)
Explanation:
If the xylem vessels of a plant are plugged :
a)
No food will be made
b)
The plant will wilt (shrivel)
c)
The leaves will turn yellow
Answer:
b is right answer because xylem provide nutrition and water to the plant
6. Which of the following is a binary compound?
a. CaCO3
b. CuSO4
c. H2O
d. Pb(NO3)2
Answer:
The answer to your question is c. H2O
Explanation:
a. CaCO3 ----> Calcium Carbonate is obviously not a binary compound because it contains more than two elements.
b. CuSO4 ----> CuSO4 stands for copper(II) sulfate. Sulfate is the polyatomic ion SO4 -2.
c. H2O ----> Binary molecular compounds are composed of only two elements. Examples are H2O, NO, SF6 etc.
d. Pb(NO3)2 ----> Lead(II) nitrate is an inorganic compound with the chemical formula Pb(NO3)2.
I hope this helps and have a great day!
write the 5 major characteristics of traditional map making
Answer:
insta
Explanation:
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a standard solution is made by diluting a small volume of stock solution. if 2.42 ml of stock solution is mixed with 7.55 ml of water, what is the concentration of the diluted solution? the stock solution concentration is 0.197 m.
Taking into account the definition of dilution, the concentration of the diluted solution is 0.063 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeConcentration of the diluted solutionIn this case, you know:
Ci= 0.197 MVi= 2.42 mLCf= ?Vf= 7.55 mLReplacing in the definition of dilution:
0.197 M× 2.42 mL= Cf× 7.55 mL
Solving:
(0.197 M× 2.42 mL)÷ 7.55 mL= Cf
0.063 M= Cf
In summary, the concentration of the diluted solution is 0.063 M.
Learn more about dilution:
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The period of the vibrating string is 0.004 seconds. What is the frequency of the
standing wave?
Answer:4
Explanation:
Which of the following are products of combustion?
liquid and solid water
newly discovered elements
additional atoms
heat and light
The answer option which are products of combustion is: D. Heat and light.
In Chemistry, there are five (5) main types of chemical reaction and these include;
Combination reaction.Double-replacement reaction.Decomposition reaction.Single-replacement reaction.Combustion reaction.A combustion reaction can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.
An example of a combustion reaction is the burning of forest trees and plants.
In conclusion, the products of combustion are heat and light.
Read more: https://brainly.com/question/21453409
Answer:
heat and light
Explanation:
d. Period 3 element with 6 valence electrons
Answer:
Sulfur is an element is Period 3 with 6 valence electrons.
wants to help?
it's agriculture science not chemistry
Answer:
the jamaians need food to survive
Explanation:
the reaction of zinc metal and hydrochloric acid produces hydrogen gas and zinc chloride. true or false?
Answer:
true.
Explanation:
Zn(s) + 2HCI(aq)=H2(g)+ZnCl2(g)
Unless otherwise instructed, you may refer to the periodic table in the Chemistry: Problems and Solutions book for this question.
Which element belongs to the p-block?
cobalt
oxygen
rubidium
hydrogen
What would cause a liquid to turn into a solid?
Answer:
Freezing the liquid
Explanation:
Freezing a liquid causes a liquid to become a soild.
Answer:
changing the temperature of the liquid
Explanation:
Ex. Cooking brownie batter(liquid), turns it into an edible brownie(solid). Ex. Putting water into a freezer freezes it, turning it into a solid.
hi everyone can anyone help with this, the question and diagram is in the pic thx!
Answer:
QP
Explanation:
P has 9 electrons.
Electronic Configuration : 2, 7
Valence electrons : 7
P needs 1 electron to get stable electronic configuration.
Q has 3 electrons.
Electronic Configuration : 2, 1
Valence electrons : 1
P needs to loose 1 electron to get stable electronic configuration.
Q donates 1 electron,
Q -----> Q+ + 1 e-
P gains 1 electron,
P + 1 e- -----> P-
Q+ + P- -----> QP
This is an ionic compound.
characteristics of mixtures
Answer:
The mixture has no fixed composition.
To form a mixture energy is neither produced nor evolved.
The mixture has no fixed melting points and boiling points.
the Mixture retains the properties of its components.
Components of mixtures can be separated by simple physical methods.
in order for a circuit work there can be no _______ within the circuit?
Explain how heat gets transferred?
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation.
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If the statement is true, write true. If the statement is false, change the underlined word
or words to make the statement true.
1. An element’s mass number tells the number of protons in its
nucleus.
2. Negatively charged particles in an atom are called electrons.
3. The cloud model of the atom describes the location of
electrons as specific orbits around the nucleus.
4. Atoms with the same number of protons but different numbers
of neutrons are called isomers.
5. The sum of the protons and neutrons in an atom is called the
atomic number.
6. An object that helps explain ideas about the natural world is
called a model.
Fill in the blank to complete each statement.
7. The positively charged particle of an atom is called a(n) .
8. A particle with no charge is a(n) .
9. A(n) is the particle of an atom that moves rapidly in the
cloudlike region around the nucleus.
10. The tells the number of protons in the
nucleus of every atom of an element.
11. Atoms of the same element that have the same number of protons but different
numbers of neutrons are called .
12. The sum of protons and neutrons in the nucleus of an atom is the
.
Write the letter of the correct answer on the line at the left.
13. The positively charged particle in an atom’s nucleus is the
A electron
B neutron
C proton
D isotope
14. The smallest particle an element can be divided into is the
A electron
B neutron
C isotope
D atom
15. An element’s identity can be determined from its
A atomic number
B number of neutrons
C number of isotopes
D energy levels
16. The model of the atom that described electrons scattered throughout a ball of positive charge was proposed by
A Niels Bohr
B Ernest Rutherford
C J. J. Thomson
D John Dalton
Answer:
5. An element's mass number tells the number of protons in its nucleus.
Atomic
6. Negatively charged particles in an atom are called electrons.
True
7. The cloud model of the atom describes the location of electrons as specific orbits around the nucleus.
Bohr
8. Atoms with the same number of protons but different numbers of neutrons are called isomers.
Isotopes
9. The sum of the protons and neutrons in an atom is called the atomic number.
Mass
10. An object that helps explain ideas about the natural world is called a model.
True
11. Mendeleev arranged his periodic table in order of increasing atomic number.
Mass
12. The rows in the periodic table are called periods.
True
13. Moving across the periodic table from left to right, one finds, in order, metals, then gases, then nonmetals.
Metalloids
14. Another name for a period is a family.
Group
15. On the periodic table, elements in the same column have similar properties.
True
Explanation:
convert 1 bromopropane to bromoethane.
Answer:
The Dehydrohaogenation of 1-bromo propane with alcoholic KOH gives propene which on again hydrohalogenation with HBr gives 2-bromo propane due to Markonikove's rule for addition.
Explanation:
A sample of an unknown solid is found to have a volume of 24.3 cm3 and a mass of
217.0 grams. What is the density of the unknown
Density = mass ÷ volume
= 217.0 g ÷ 24.3 cm³
= 8.93 g/cm³
∴ the unknown sample of mass 217.0 grams and volume of 24.3 cm³ has a density of 8.93 g/cm³.Can you convert this balanced equation into a nominative equation?
Answer:
yes you can
Explanation:
Inside the box is a list of endangered animals in the Philippines. Group the animals in three ways and make a diagram of your groupings in the space below.
Equation between Mg and H2O
Answer:
Mg + 2H2O → Mg(OH)2 + H2, is normally sluggish, but it becomes reasonably rapid when a milled composite of powdered magnesium metal and powdered iron (1−10 mol %) is used with sodium chloride solutions.
How many protons does silicon have?
28
2
14
28.08
Answer:
14
Explanation:
Boron has two naturally-occurring isotopes. Boron-10 has an abundance of 19.8% and actual mass of 10.013 amu, and boron-11 has an abundance of 80.2% and actual mass of 11.009 amu. What is the average atomic mass for all isotopes of boron?
A 10.0 amu
B 10.5 amu
C 10.511 amu
D 10.812 amu
Answer:
D) 10.812
Explanation:
Given:
The two isotopes of boron (B).
Boron-10 has an abundance of 19.8% and Boron -11 has an abundance of 80.2%
To find:
The atomic mass of europium.
Solution:
Mass of Boron-10 = 10.013 amu
The percentage abundance of Boron-10 = 19.8%
The fractional abundance of Boron-10 =0.198
Mass of Boron-11 = 11.009 amu
The percentage abundance of Boron-11= 80.2%
The fractional abundance of Boron-11= 0.802
The average atomic mass of Boron = A.M
A.M = Mass of isotope x Fractional abundance of isotope
= 10.013amu x 0.198 +11.009amu x 0.802 = 10.81u
Therefore, D) 10.812 amu is the atomic mass of boron.
Compare and contrast how light acts as a wave and as a particle
here you go
Explanation:
the flow of photons is a wave. ... The various properties of light, which is a type of electromagnetic wave, are due to the behavior of extremely small particles called photons that are invisible to the naked eye
When you rub an inflated balloonon your head on a dry day,it can make your hair stand up! what force is that?
When you rub an inflated balloon on your head and it makes your hair stand up, the force that makes the hair stand up is known as static electricity.
When the balloon is rubbed on the head, electrons from the hair atoms move into the balloon, thus making the balloon to be negatively charged and the hair positively charged due to loss of electrons.
Unlike charges attracts. Thus, when you try to pull the balloon away slowly, the positively charged hair and the negatively charged balloon will attract each other and this is usually what makes the hair stand up.
More on static electricity can be found here: https://brainly.com/question/24160155
Answer:
static electricity
Explanation:
this is because there is an imbalance between negative and positive charges
when you keep on rubbing, a negative charge is created which is carried by electrons.
when you pull the balloon away slowly, the opposite charges attract to each other which makes your hair attract to the balloon
how many molecules of butane are contained in 25.0 ml of butane? the density of butane is 0.6011 g/ml and the molar mass is 58.12 g/mol.
Explanation:
To determine the molecules of butane we can either use multiple steps or use a combined equation based on the following formulas:
Molecules of butane = Moles × Avogadro's Number
Moles of Butane = Mass ÷ Molar Mass
Mass of Butane = volume × Density
∴ Molecules of butane
= [(volume × Density) ÷ Molar Mass] × Avogadro's Number
= ([(25.0 ml × 0.6011 g/ml) ÷ 58.12 g/mol] × (6.022 × 10²³ molecules/mol))
= 1.557 × 10²³ molecules
∴ 25.0 ml of butane of density of 0.6011 g/ml contains 1.557 × 10²³ molecules.Two different medical students made models to show their ideas about the molecules that should be in the functioning cells of a healthy body. Using what you have figured out from reading and investigating so far, evaluate the models by answering the questions following the models.
Are these models accurate? choose one)
Medical Student A’s model is accurate.
Medical Student B’s model is accurate.
Both models are accurate.
Neither model is accurate.
Answer:
A
Explanation:
it's a because model is like the same thing as walking on a Runway but it's like a model in the medical field
What is the temperature of Spica?
Answer:
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Explanation:
22,400 Kelvin
22,400 KelvinSpica A and B are both classified as B-type stars and are very hot, with surface temperatures of 22,400 Kelvin and 18,500 Kelvin respectively. The primary component has a luminosity of some 12,100 Suns while the secondary shines with the power of 1500 Suns.
Light energy travels in waves, originates directly from the Sun, and is used by plan
to make food. Scientist use light energy to create lasers for cutting, heating,
measuring. Light energy is so important that it is responsible for the existence
most life forms. Furthermore, light energy is the only visible form of energy. It ca
travel through air, space, water, and glass. Light travels in a straight line until
strikes an object or travels from one medium to another. As it travels from or
medium to another it appears to bend.
Which term is best used to describe the bending of light waves?
A
refraction
B
reflection
C
rotation
D
revolution
La
Answer:
A) Refraction , this is the correct answer.
Hope it helps!!
Answer:
A refraction. I'm an electrician building aspects they put circular cones through the building and where they bend they have refractors and so you can have a completely closed off building and the light will come through from the rooftops through these tubes and the light been through refractors to make it look like you have a moonroof
