The standard unit for measuring mass is the
Answer:
kilogram (kg)
Explanation:
Determing Valence Electrons
Use your periodic table to determine the correct number of valence electrons for the elements below
Element
Group Number
Valence
Electrons
Period
Energy Levels
+
Cesium (Cs)
lodine 0
Arsenic (As)
Gallium (Ga)
Calculate the mass of 4.55x1024 molecules of sucrose
Answer:
2584 g
Explanation:
The molecular formula for sucrose is C₁₂H₂₂O₁₁, which means its molar mass is 342.3 g/mol.
First we convert molecules into moles by using Avogadro's number:
4.55x10²⁴ molecules ÷ 6.023x10²³ mol/molecules = 7.55 molNow we convert moles of sucrose into grams, using its molar mass:
7.55 mol * 342.3 g/mol = 2584 gIf you used .010 moles of baking soda, what mass of carbon dioxide should be produced?
Answer:
d
Explanation:
Where are the electrons inside an atom?
A.The electrons are in the nucleus of an atom
B.They are arranged in energy levels
C.The electrons are spread equally throughout the atom
Answer: B.They are arranged in energy levels
Explanation: Electrons orbit around the nucleus of an atom, and are not spread around equally throughout an atom because there are a different amount of electrons that can fit in each energy level or electron shell (both are the same thing). For example the first energy level can hold up to 2 electrons, the second shell can hold up to 8 electrons, the third can hold up to 18, and so on represented by the equation 2(n^2)
write short note on earth sheltering
Answer:
hfxyktxykt
Explanation:
An earth shelter is a structure (usually a house) with earth (soil) against the walls, on the roof, or that is entirely buried underground.
An earth sheltered house in Switzerland (Peter Vetsch)
Earth acts as thermal mass, making it easier to maintain a steady indoor air temperature and therefore reduces energy costs for heating or cooling.
Earth sheltering became relatively popular after the mid 1970s, especially among environmentalists. However, the practice has been around for nearly as long as humans have been constructing their own shelters.
PLEASE THANK, RATE AND FOLLOW ME,
AND PLEASE MARK ME AS "BRAINLIEST" ANSWER
HOPE IT HELPS YOU
What are the two main types of energy?In an illustration, lines of force are drawn around a magnet to illustrate the magnetic
______and __________ factors can affect an organism’s genetic traits
Answer:
i think its Environmental and mutagens
Explanation:
Since protons (p+) with a positive charge and neutrons (n0) without a charge are located in the nucleus, what is the overall charge of the nucleus portion of an atom: positive, negative, or no charge at all? Explain.
Answer:
Positive
Explanation:
The nucleus of an atom has a net positive charge which is balanced by the negative charge of the electrons residing in the orbital of an atom. The reason why the nucleus of an atom is positively charged is because it contains two sub atomic particles;
The protons and neutrons. In terms of charge, the proton is positively charged and the neutron is neutral. This means the neutron does not partake in the charge of the nucleus. Hence the net charge of the nucleus is decided by the protons which are positively charged
11
Two students are investigating relative motion. One student is on a bike and the other is on
foot.
The students on foot runs alongside the student on the bike as they cycles at the same speed.
Is their relative motion the same? Explain your answer? (highlight the correct answer)* 193
(1 Point)
Explanation:
No because the person on the bike is going faster then the person on foot.
Which describes an atom that has fewer neutrons than protons and more lecterns than protons?
Answer:
An atom that has fewer neutrons than protons and more electrons than protons is a negative ion. The negatively charged particles in an atom are the electrons. The charge an atom carries depends on the balance between the number of protons and electrons in an atom.
Explanation:
why are cells small?
Answer:
you know what i really dont know but imagine if they were huge
Explanation:
1
1. Inphotosynthesis, plants convert Inwhat type of energy into what other type of energy?
Pls help me
can someone help answer this? thanks!
if surface tension relies on intermolecular forces, how could you make surface tension decrease?
(think about how and where molecules bind to each other)
Answer:
We could make the surface tension to decrease by removing and causing a disruption to the intermolecular forces(hydrogen bonds).
Explanation:
To explain this answer, we will consider an experiment whereby a paper clip is made to rest at the top surface of water inside a container/beaker.
First of all, the intermolecular forces present in water are also known as hydrogen bonds.
It's relationship with surface tension is that when there is high surface tension in the water, this high tension will allow the paper clip to rest on top of the hydrogen bonds present at the top surface in between the water molecules.
However, the surface tension will decrease when we remove or cause a disruption to the intermolecular forces (hydrogen bonds).
A process in which substances chemically rearrange to form new substances
Molecule
Energy
Organism
Chemical reaction
Matter
Cellular respiration
Answer:
Chemical reaction
Explanation:
After new substances are formed they can't be reversed to their original state.
Molecules are
close and
barely move
They keep
one shape
Was Dalton's Atomic Theory correct or incorrect and why?
Answer:
The indivisibility of an atom was proved wrong: an atom can be further subdivided into protons, neutrons and electrons. However an atom is the smallest particle that takes part in chemical reactions. ... According to Dalton, atoms of different elements combine in simple whole number ratios to form compounds.
List and describe all five types of chemical reactions. thx.
Answer:
combination, decomposition, single-replacement, double-replacement, and combustion.
Explanation:
How can a chemical reaction be sped up?
Select from the drop-down menu to correctly complete the statement.
Pack in more of the reactant to increase the
A) Catalyst
B) Concentration
C) Surface Area
D) Temperature
Answer: monki says d
Explanation: monki big brain oof
Answer:
d
Explanation:
What might the student have done that caused this
error? List all possible causes.
Answer:
The capillary tube was too close to the bottom of the beaker.
The ruler may have moved.
Water got into the capillary tube.
The temperature was not allowed to equilibrate in the 2-4 minutes.
Explanation:
HELLPP!!! What is needed in order to write the electron configuration for elements? Choose all that applies.
Answer:
atomic number and electrons
Explanation:
How does thermal energy flow between a hot or cold pack and the atmosphere?
Answer:
Heat is the transfer of energy. During energy transfer, the energy moves from the hotter object to the colder object. This means that the hotter object will cool down and the colder object will warm up. The energy transfer will continue until both objects are at the same temperature.
Explanation:
Which elements had only one valence electron?
Answer:
sodium has only one valance electron in valence shell
The CO2 that builds up in the air of a submerged submarine can be removed by reacting it with sodium peroxide. 2 Na2O2 (s) + 2 CO2 (g) → 2 Na2CO3 (s) + O2 (g)
If a sailor exhales 150.0 mL of CO2 per minute at 20oC and 1.02 atm, how much sodium peroxide is needed per sailor in a 24 hr period?
Answer: The sodium peroxide needed per sailor in a 24 hr period is 674 grams.
Explanation:
According to ideal gas equation:
[tex]PV=nRT[/tex]
P = pressure of gas = 1.02 atm
V = Volume of gas = 150.0 ml = 0.15 L
n = number of moles of carbon dioxide = ?
R = gas constant =[tex]0.0821Latm/Kmol[/tex]
T =temperature =[tex]20^0C=(20+273)K=293K[/tex]
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{1.02atm\times 0.15L}{0.0821 L atm/K mol\times 293K}=0.006moles[/tex]
[tex]2Na_2O_2(s)+2CO_2(g)\rightarrow 2Na_2CO_3(s)+O_2(g)[/tex]
According to stoichiometry:
2 moles of carbon dioxide require = 2 moles of sodium peroxide
Thus 0.006 moles carbon dioxide require= [tex]\frac{2}{2}\times 0.006=0.006[/tex] moles of sodium peroxide
Mass of sodium peroxide needed for 24 hour=[tex]moles\times {\text {Molar mass}}=0.006mol\times 78g/mol\times 24\times 60=674g[/tex]
Thus sodium peroxide needed per sailor in a 24 hr period is 674 grams.
The amount (in grams) of sodium peroxide needed per sailor in a 24 hr period is 673.92 g
Determination of the mole of CO₂Volume (V) = 150 mL = 150 / 1000 = 0.15 L Temperature (T) = 20 °C = 20 + 273 = 293 KPressure (P) = 1.02 atmGas constant (R) = 0.0821 atm.L/Kmol Mole of CO₂ (n) =?Using the ideal gas equation, we can obtain the mole of CO₂ as follow:
n = PV / RT
n = (1.02 × 0.15) / (0.0821 × 293)
n = 0.006 mole
How to determine the mole of Na₂O₂ required2Na₂O₂ + 2CO₂ → 2Na₂CO₃ + O₂
From the balanced equation above,
2 moles of CO₂ required 2 moles of Na₂O₂.
Therefore,
0.006 mole of CO₂ will also require 0.006 mole of Na₂O₂.
How to determine the mass of Na₂O₂ required Mole of Na₂O₂ = 0.006 mole Molar mass of Na₂O₂ = (23×2) + (16×2) = 78 g/mol Mass of Na₂O₂ =?Mass = mole × molar mass
Mass of Na₂O₂ = 0.006 × 78
Mass of Na₂O₂ = 0.468 g per minute
Mass of Na₂O₂ required for 24 h = 0.468 × 24 × 60 = 673.92 g
Learn more about stoichiometry:
https://brainly.com/question/14735801
What type of elements can react with metals to form salts
Answer:
The Alkali metals
Explanation:
The alkali metals react with the nonmetals in Group VIIA (F2, Cl2, Br2, I2, and At2) to form ionic compounds or salts. Example: Chlorine reacts with sodium metal to produce sodium chloride, table salt. Because they form salts with so many metals, the elements in Group VIIA are known as the halogens.
Alkali metals are the type of metal that can react with metals to form salts. They form ionic compounds or salts when reacting with non-metals.
What are alkali metals?Alkali metals are the six elements of group 1 of the periodic table. thee metals are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
The main characteristics of alkali metals are:
They are brittle, metallic bonding causes them to be soft metals.Both their melting and boiling points are low.They are metals that are quite reactive.Ionization energy is the force needed to eject an electron from the outermost shell.Alkali metals interact to generate ionic compounds or salts. As an illustration, sodium metal and chlorine react to form sodium chloride or table salt.
Thus, alkali metals form salt when reacting with metals.
To learn more about alkali metals, refer to the link:
https://brainly.com/question/5063184
#SPJ2
Can someone pls help me on this
Answer:The bottom 3
Explanation:
Beacuse all of these have to do with this subject hope this helps.
PLEASE HELP!! WILL MARK BRAINLIEST
Use the Internet to list five examples of elements with their properties and five examples of compounds with their properties.
Answer:
here you go
Explanation:
5 elements and properties:
Boron- The chemical properties of boron are more similar to carbon and silicon than elements of its own group, although boron is more electron deficient. Boron has a high affinity for oxygen-forming borates, and reacts with water at temperatures above 100 °C to form boric acid and other boron compounds.
Carbon- As a member of group 14 on the periodic table, it is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. The most common isotope of carbon has 6 protons and 6 neutrons, and has an atomic mass of 12.0107 amu. Its ground state electron configuration is 1s22s22p2.
Nitrogen- Nitrogen gas (chemical symbol N) is generally inert, nonmetallic, colorless, odorless and tasteless. Its atomic number is 7, and it has an atomic weight of 14.0067. Nitrogen has a density of 1.251 grams/liter at 0 C and a specific gravity of 0.96737, making it slightly lighter than air.
Oxygen- is the air you breath
Nickel- Nickel is a hard silver white metal, which forms cubic crystals. It is malleable, ductile, and has superior strength and corrosion resistance. The metal is a fair conductor of heat and electricity and exhibits magnetic properties below 345°C
5 compounds and properties:
Water - Formula: H2O = Hydrogen2 + Oxygen. ...
Hydrogen Peroxide - Formula: H2O2 = Hydrogen2 + Oxygen2 ...
Salt - Formula: NaCl = Sodium + Chlorine. ...
Baking Soda - Formula: NaHCO3 = Sodium + Hydrogen + Carbon + Oxygen3
Octane - Formula: C8H18 = Carbon8 + Hydrogen18
hope this helps
TIMED TEST PLEASE HURRY!!! The development of a new experimental method is most likely to change a theory if it makes it possible to
analyze samples when they are frozen.
perform the experiment in a different lab.
obtain and analyze results more quickly.
study a larger sample size than before.
Answer:
study a larger sample size than before.
Explanation:
Science is evolving day by day and every new experiment is contradict the old experiment, giving new theories.
The advancement in the technology modifying the new experimental methods and it can change a theory if study a larger sample size than before. It is so because new experiment verify and validates larger sample size and evidences can contradict the old theory. Large sample size means more experiments and more validations.
Hence, the correct answer is "study a larger sample size than before."
Answer: is the D
Explanation:
what ions are formed when sodium reacts with fluorine
Answer:
One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it.
Explanation:
Which of these does not cause seasonal change?
A.the tilt of the Earth’s axis
B.the Earth’s orbit around the sun
C.the Earth’s distance from the sun
D.which side of the Earth is tilted toward the sun
Answer:
C.the Earth’s distance from the sun
Explanation:
Distance Does Not Cause Seasons
It is a common misconception that seasons occur because of Earth's elliptical orbit around the Sun, with winter occurring when Earth is farthest away from the Sun, and summer when it is closest to it. However, our planet's distance from the Sun has little effect on the onset of seasons.
The distance of the earth from the sun does not cause seasonal change. Therefore, option (C) is correct.
What is the reason for the seasonal changes?The seasons are changing depending on the sunlight reaching the Earth as it orbits around the sun during the year. The season changes are caused by the Earth as it is tilted on its axis. The earth travels each year in a loop around the sun.
The hemisphere of the Earth has tilted towards or away from the Sun. Because of that, there are different types of seasons are formed which are experienced in a whole year.
Summer season occurs on the earth when the hemisphere is tilted towards the sun and winter occurs in the hemisphere tilted away from the sun.
Because sunrays travel directly to the surface of Earth, the hemisphere which is tilted toward the sun is warmer. So they are less scattered in the atmosphere.
Learn more about seasonal change, here:
https://brainly.com/question/8760061
#SPJ2