Answer:
Blank 1: 4
Blank 2: 1
Blank 3: 2
Explanation:
The unbalanced reaction expression is given as:
Na + O₂ → Na₂O
Now, we use a mathematical approach to balance the reaction given above.
Assign coefficients a , b and c for the blanks:
aNa + bO₂ → cNa₂O
Conserving Na : a = 2c
O: 2b = c
So, let c = 1, a = 2 and b = [tex]\frac{1}{2}[/tex]
Multiply through by 2;
a = 4, b = 1 and c = 2
4Na + O₂ → 2Na₂O
Blank 1: 4
Blank 2: 1
Blank 3: 2
If Angie knows that baking soda reacts with vinegar producing CO2, what conclusion can she draw from this experiment?
A
CO2 has the capacity to combust in the air around the flame and extinguish it.
B
CO2 can displace oxygen around the flame because it has a lower density than air.
C
CO2 can displace oxygen around the flame because it has a higher density than air.
D
CO2 has the capacity to absorb the heat of the air around the flame and extinguish it.
Answer:
Option C:
CO2 can displace oxygen around the flame because it has a higher density than air.
Explanation:
CO2 is heavier - or in this case, we can say denser than air. In addition to that, CO2 does not support burning. t is a major component in fire extinguishers that are designed to stop minor domestic fire incidents.
Since CO2 is denser than air, it sinks to the bottom of the room, and surrounds the flame with an atmoshphere inert to combustion, pushing the oxygen upwards in the process, away from the reach of the flames.
This causes the fire to starve to death from lack of oxygen
A small amount of solid potassium dichromate is added to water and stirred until all of the solid has dissolved and a clear orange liquid is produced. This process may be described as: Group of answer choices the formation of a heterogeneous mixture. dissolution of the molecular compound sublimation. dissolution and dissociation of the ionic compound.
Answer: dissolution and dissociation of the ionic compound.
Explanation:
Ionic compound is formed by the transfer of electrons.
For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.
Here potassium metal forms [tex]K^+[/tex] cation and [tex]Cr_2O_7^{2-}[/tex] anion which exchange their oxidation states to form [tex]K_2Cr_2O_7[/tex].
When ionic compound is dissolved in water, it dissociates to its respective ions.The ions form bonds with oppositely charged ions of water molecules and thus get dissolved in water called as dissolution.
a Use carbon's position in the Periodic Table to explain why carbon normally
forms four covalent bonds.
Which compound would be classified as a covalent bond
A. KI
B. CaCl2
C. P2O5
D. MgO
Answer:
Explanation:
Examples of compounds that contain only covalent bonds are methane (CH4), carbon monoxide (CO), and iodine monobromide (IBr). Covalent bonding between hydrogen atoms: Since each hydrogen atom has one electron, they are able to fill their outermost shells by sharing a pair of electrons through a covalent bond
The compound that is classified as covalent bond is P₂O₅
The correct answer to the question is Option C. P₂O₅
Covalent bond is a type of bond in which there is a sharing of electron(s) between the atoms involved. Compounds formed by this type of bond are called covalent compounds.
Covalent bond exist between non metals only
With the above information in mind, we can conclude that P₂O₅ is a covalent compound as both phosphorus and oxygen are non metals.
The rest options in the question contains metal and non metals.
The correct answer to the question is Option C. P₂O₅
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What would be the new pressure if a gas at 1 atm pressure and 20c was heated to 80c
Answer:I think it’s
Explanation:
190c
Removing tropical rain forests has a _____ effect on climate.
a. warming
b. cooling
An erupting volcano has a _____ effect on climate.
a. cooling
b. warming
Answer:
1. a) warming
2. a) cooling
Explanation:
1. Deforestation leads to more carbon dioxide and less oxygen in the atmosphere, because trees are in charge of taking in CO2 and releasing O2. More of the sun's radiation is reflected back to Earth if there's more CO2 in the atmosphere, which is why it has a warming effect on climate.
2. During a volcanic eruption, a volcano releases ash or dust particles that shade sunlight, which causes temporary cooling. The smallest particles can stay in the stratosphere for months, blocking sunlight, causing a long cooling effect on climate.
A 5.00 g sample of a pure substance powder is heated, and the powder leaves 4.63g of a shiny, metallic liquid. Is the powder an element or a compound? Explain
Answer:
compound
Explanation:
We already know that the original substance was pure. If this substance was pure and it was powdery in nature then we have a footing to start from.
Secondly, a 4.93 g of shinny metallic liquid was left behind. This shinny metallic liquid must be an element.
Since there was a loss in mass during heating, it follows that there were other components of the pure powder.
If the reasoning stated above is correct, then the substance is a compound.
Temperature is a measure of __________ movement.
Hint: It includes two words.
Answer:
Kinetic Energy
Explanation:
Temperature is a measure of the average kinetic energy of the particles in a substance. And also Kinetic Energy has 2 words.
percent composition for Na2S
Answer:
i gotchu my g
Explanation:
Element Symbol Mass Percent
Sodium Na 58.914%
Sulfur S 41.086%
What is diffusion?
Class 9th
Chemistry
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration . Diffusion happens in liquids and gases because their particles move randomly from place to place . Diffusion is an important process for living things ; it is how substances move in and out of cells .
Pls follow me and Mark as brainlest :-)
Answer:
diffusion is a means of transport, which occurs through cells . for example exchange of gases that takes place in alveoli occurs due to diffusion.
Explanation:
in diffusion the object or fluid moves from region of higher concentration to the region of lower concentration.
How to fronts and air masses affect weather?
Answer:
Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface.
Explanation:
Good luck!
Plisss help I’ll give you brainless Waves can be identified in many different ways. Using the diagram below, identify
which property of a wave is shown by the part of the diagram labeled F?
Answer:
Wavelength
Explanation:
Convert the following word equations into formula equations by changing element and compound names into chemical formulas.
1. sodium + oxygen → sodium oxide
2. copper + silver nitrate → copper(II) nitrate + silver
3. aluminum chlorate + barium sulfate → aluminum sulfate + barium chlorate
4. bromine + calcium iodide → calcium bromide + iodine
5. zinc sulfide + magnesium arsenate → zinc arsenate + magnesium sulfide
6. cobalt + lead(II) nitrite → cobalt(III) nitrite + lead
7. potassium + water → potassium hydroxide + hydrogen
Answer:
Na + O.2 = NaO.2 whereas Cu + AgNo3 = Cu.2No.3 +AG
The given reactions can be converted to equations as follows:
1. 2 Na + O2 → 2 Na2O
2. Cu + 2 AgNO3 → Cu(NO3)2 + 2 Ag
What is a balanced chemical equation ?A balanced chemical equation is a representation of a chemical reaction using chemical formulas of reactants and products. It shows the number of atoms of each element on both the reactant and product sides of the equation.
The equation is balanced when the number of atoms of each element is the same on both sides of the equation.
The given reactions can be written as balanced equations as follows:
2 Na + O₂ → 2 Na₂O2. Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag2 Al(ClO₃)₃ + 3 BaSO4 → Al2(SO₄)₃ + 3 Ba(ClO₃)₂Br₂ + CaI₂ → CaBr₂ + I₂ZnS + Mg₃(AsO₄)2 → Zn₃(AsO₄)₂ + 3 MgSCo + 2 Pb(NO₂)₂ → Co(NO₂)₂ + 2 Pb2 K + 2 H₂O → 2 KOH + H₂Find more on balanced chemical equations :
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How many moles are in 6.7x10^23 formula units of NaCI?
A. 872 moles.
B. 3.87x10^24 moles.
C. 21.07 moles.
D. 1.1 moles.
Answer:
UNIT 10
1.) A cylinder is filled with 2.00 moles of nitrogen, 3.00 moles of . If
the gas mixture is at STP, what is the partial pressure of the argon?
(A) 152 torr (B) 228 torr (C) 380. torr (D) 760. torr
2.) Compared to the average kinetic energy of 1 mole of water at 0 oC, the average kinetic energy
of 1 mole of water at 298 K is
(A) the same, and the number of molecules is the same
3.) If the pressure on a given mass of gas in a closed system is increased and the temperature
remains constant, the volume of the gas will
(A) decrease (B) increase (C) remain the same
4.) Which gas has approximately the same density as C2H6 at STP?
(A) NO (B) NH3 (C) H2S (D) SO2
5.) At a temperature of 273 K, a 400. milliliter gas sample has a pressure of 760. millimeters of
mercury. If the pressure is changed to 380. millimeters of mercury, at which temperature will
this gas sample have a volume of 551 milliliters?
(A) 100 K (B) 188 K (C) 273 K (D) 546 K
Get the answers to these questions
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PLZ HELP THIS IS DUE IN 2 MINS!!!!!!
8. You hold a 50N bowling ball above your head for 15 minutes. How much work have you done? Why?
9. You run the 100 M race in 15 seconds and your identical twin runs it in 14s. Who did more work? Why?
Answer:
8. 3.333333n per minute
9. you
Explanation:
8. Divide 50 by 15 and you get 3.333333.
9. 100 divided by 15 is 6.66666. 100 divided by 14 is 7.14.
So you did more work.
What is the best definition of solar radiation?Storing Storing of of energy energy in in Earth'Earth's s oceansoceansEnergy Energy from from the the Sun Sun that that reaches reaches EarthEarthMoisture Moisture and and heat heat energy energy in in the the atmosphereatmosphereIncreased Increased evaporation evaporation due due to to warm warm waterwater
Answer:The solar energy that we receive through solar radiation is directly or indirectly responsible for aspects as important to life as: Photosynthesis in plants; maintaining a planet temperature compatible with life. of the wind. The solar energy that reaches the earth's surface is 10,000 times greater than the energy currently consumed by all
Explanation:
A 0.200 M NaOH solution was used to titrate a 18.25 mL HF
solution. The endpoint was reached after 31.20 mL of titrant
were added. Find the molar concentration of the original HF
solution.
Answer:
The molar concentration of HF is 0.34 M
Explanation:
Given data:
Molarity of NaOH =M₁ = 0.200 M
Volume of HF =V₂= 18.25 mL
Volume of NaOH added = V₁ = 31.20 mL
Molarity of HF solution = M₂ = ?
Solution:
M₁V₁ = M₂V₂
by putting values,
0.200 M × 31.20 mL = M₂ × 18.25 mL
M₂ = 0.200 M × 31.20 mL / 18.25 mL
M₂ = 6.24 M.mL / 18.25 mL
M₂ = 0.34 M
Thus, the molar concentration of HF is 0.34 M.
A carpenter uses a saw to cut a wooden board into two different sized pieces. Which of the following physical properties is most
likely to be the same for both pieces of wood?
1. density
2. mass
3. volume
4. weight
Plz help me with is thank you
Answer:
d
Explanation:
the pattern of the chart
Explain cell division in multicellular organisms?
Answer:
the divide through osmosis of mitosis or sum
Explanation:
Answer:
In multicellular organisms, cell division aids in the formation of gametes, which are cells that combine with others to form sexually produced offspring. For growth to occur in living organisms, the number of cells have to increase through cell division until it reaches its maximum size. The human body also repairs injuries by means of cell division.
I hope this answer helps you find your answer! Have a great day! :)
Compare heat and thermal energy. Correct answers please. Or I’ll report you(:
What percent of FeSO4 • 6H20 is Fe?
The percentage of FeSO4 • 6H20 is Fe is 36.04%.
What is FeSO4 ?The iron sulphate or ferrous sulphate is a range of salts with the formula of FeSO4. These are the compounds that exist with the heptahydrate.
The ferrous sulphate is mainly used as a preprocessor for the iron compounds. It is a reducing agent and can be seen in cement to lessen the toxic compounds. It generally consists of 20 to 30% of the elemental, iron per mg of the mineral.
Find out more information about the FeSO4 • 6H20.
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If wind is eroding an area at a rate of 2 mm per year and depositing it in a smaller area at a rate of 7 mm per year, how much lower will the first area be in meters after 2 thousand years? How much higher will the second area be?
Answer:
After 2000 years, the first after will be 4m lower.
After 2000 years, the second area will be 14m higher.
Explanation:
From the given information:
At the first area:
if the wind is eroding at 2 mm/year, then after 2000 years; we have:
2 mm/year × 2000 year = 4000 mm
4000 mm to meters, we have:
[tex]=4000 \ mm \times \dfrac{1 \ m}{ 1000 \ mm}[/tex]
= 4 m lower
At the second smaller area:
Given that the wind is depositing it at the rate of 7 mm per year;
Then:
7 mm/year × 2000 year = 14000 mm
[tex]=14000 \ mm \times \dfrac{1 \ m}{ 1000 \ mm}[/tex]
=14 m higher
How are cancer cells different that normal cells
Answer:
I have that same photo (I always where that combo lol)
Explanation:
In contrast to normal cells, cancer cells don't stop growing and dividing, this uncontrolled cell growth results in the formation of a tumor. Cancer cells have more genetic changes compared to normal cells, however not all changes cause cancer, they may be a result of it.
Answer: Can i have Brainliest & 100 POINTS
Explanation:
How many strawberries would you need to make 12 smoothies?
Answer: Hey! You need 48 Strawberries to make 12 smoothies.
Explanation: I knew this before but needed to make sure if it's true. So I tested it by myself and got it!
You are very welcome!
You need 84 strawberries to make 12 smoothies.
What is multiplication?Multiplication is a mathematical arithmetic operation. It is also a process of adding the same types of expression for some number of times.
Example - 2 × 3 means 2 is added three times, or 3 is added 2 times.
Given:
Martha needs 28 strawberries to make 4 smoothies.
To make one smoothie,
Martha needs = 28/4 = 7 strawberries.
To make 12 smoothies,
Martha needs = 12 x 7
= 84 strawberries.
Therefore, you need 84 strawberries.
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The complete question:
Martha needs 28 strawberries to make 4 smoothies.
How many strawberries would Martha need to make 12 smoothies?
Sarah throws a ball to Billy, but it does not go far enough for him to catch it. What must Sarah apply to her next throw in order for it to reach Billy?
Answer:
Power
Explanation:
That’s the answer
The volume of a gas is 450 mL when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L?
Use P Subscript 1 Baseline V Subscript 1 = P Subscript 2 Baseline V Subscript 2.
0.225 atm
0.444 atm
2.25 atm
4.44 atm
Answer:
0.225 atm
Explanation:
v1=450ml÷1000=0.45l(1l=1000ml)
P1=1
v2=2.00l
p2=?
p1v1=p2v2
p2=p1v1/v2
=1×0.45/2
=0.225
so the answer is first one
This question is based on Boyle's law as temperature is constant. Boyle's law is derived from ideal gas equation only at constant temperature. Thus the pressure calculated is 0.225atm.
What is Boyle's law?
Boyle's law is a law which states that at constant temperature, the pressure that is exerted by an ideal gas on the walls of the container is inversely proportional to the volume occupied that gas.
Ideal gas is a gas where there is no forces of attraction or forces of repulsion between the particles . The volume of container is equal to the volume occupied by the gas.
Mathematically,
Initial condition to final condition
[tex]P_{1}V_{1} \rightarrow P_{2}V_{2}[/tex]
[tex]P_{1}[/tex]=1.00atm
[tex]V_{1}[/tex]=450 mL=0.45l
[tex]P_{2}[/tex]=?
[tex]V_{2}[/tex]=2.00L
Substituting all values in given equation
[tex]P_{1}V_{1} \rightarrow P_{2}V_{2}\\P_{2}=P_{1}V_{1}\div V_{2}[/tex]
[tex]P_{2}[/tex]=(1×0.45)÷2.00
[tex]P_{2}[/tex]=0.225atm
Thus the pressure when volume changed to 2.00 is 0.225atm.
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Explain the trend you see in your graph and explain why this occurs at a particle level what is happening when the volume or pressure increases what does the particles do within the sample explain this concept in detail
Answer:
incline
Explanation:
what is the formula for copper (iii) selenide?
Answer:
compound formula is CuSe is answer.
Explanation:
I hope it's helpful!
