Answer:
C. Physical Change
Explanation:
Peeling a banana is not changing the banana's structure, it's still the same banana, but it looks different, which is a chemical change! Hope I helped!
What is the ratio of hydrogen atoms to oxygen atoms in a water molecule?
What can rocks tell paleoclimatologists about Earth’s atmosphere at the time that the rock was forming?
Science Safety Poster Project
A .......... notifies you that danger is present if the directions are not followed.
•A . Warning
•B.Hazard
•C. Safety
•D. Danger
Answer:
A. Warning
Explanation:
Out of all said choices, the best choice would be warning since it would fit the sentence the most.
"A Warning notifies you that danger is present." compared to:
"A Hazard notifies you that danger is present."
"A Safety notifies you that danger is present."
"A Danger notifies you that danger is present."
Why do balls bounce higher on hard floors than on carpet?
a) They don't. That is a myth.
b) The carpet friction creates thermal energy.
c) The carpet fibers attract the molecules in the ball.
d)The carpet is so nice and soft the ball doesn't want to go.
Answer:
I'm pretty sure c......
Answer is B
The friction causes the ball to lose energy on carpets, which makes the ball bounce less. On hard floors, not as much thermal energy is lost, which is why it bounces higher.
8. How many moles of carbon dioxide are there in 52.06 g of carbon dioxide?
A) 0.8452
B) 1.183
C) 6.022 x 1023
D) 8.648 x 1023
E) 3.134 x 1025
Answer:
B) 1.183
Explanation:
To convert from grams (mass) to moles, we need to divide by the atomic mass (amu)..
The amu of [tex]CO_{2}[/tex] is 44.008
52.06/44.08 = 1.182966733
This can be rounded to 1.1830 moles of CO2
1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.
Explanation:
Moles of substance are defined ratio of the given mass of the substance to the molar mass of the substance.Given :
The 52.06 grams of carbon dioxide.
To find :
The moles of carbon dioxide.
Solution:
The mass of carbon dioxide = 52.06 g
The molar mass of carbon dioxide = 44.01 g/mol
The moles of carbon dioxide:
[tex]=\frac{52.06 g}{44.01 g/mol}=1.183 mol[/tex]
1.183 moles of carbon dioxide are there in 52.06 g of carbon dioxide.
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Increasing the force on an object _________ its acceleration, if the mass of the object stays the same
The following is a procedure that was theoretically performed by a student. Read through the procedure and answer the questions below.1.A 10.0 mL graduated cylinder to measure 10.0 mL of a 1.00 M CaCl2 solution into an initially empty 50.0 mL beaker.2.A 50.0 mL graduated cylinder was then used to measure out 25.0 mL of 0.500 M K2CO3. This K2CO3solution was then added to the beaker containing the CaCl2 solution. The solution became cloudy, and the student concluded that a precipitate must have formed. Write a balanced chemical reaction below, including phases, and identify the chemical formula of the precipitate:
Answer:
CaCl2 (aq) + K2CO3(aq) ---------> CaCO3(s) + 2KCl(aq)
Explanation:
We have the reactants as calcium chloride and potassium carbonate. Recall that we are expecting that the reaction will yield a precipitate. We must keep that in mind as we seek to write its balanced chemical reaction equation.
So we now have;
CaCl2 (aq) + K2CO3(aq) ---------> CaCO3(s) + 2KCl(aq)
Recall that the rule of balancing chemical reaction equation states that the number of atoms of each element on the right side of the reaction equation must be the same as the number of atoms of the same element on the left hand side of the reaction equation.
Propionic acid (CH3CH-COOH) has a K, 1.3 x 10^-5 and phosphoric acid (H3PO2) has a Ka = 7.5 x 10^-3
Choose the conjugate base for each.
A. CH3CH2COO2- for CH3CH2COOH; HPO4 2- for H3PO4
B. CH3CH2CO- for CH3CH2COOH; H2PO3 - for H3PO4
C. CH3CH2COOH2 for CH3CH2COOH; H4PO4 for H3PO4
D. CH3CH2COO- for CH3CH2COOH; H2PO4 - for H3PO4
Answer:
D. CH3CH2COO- for CH3CH2COOH; H2PO4 - for H3PO4.
Explanation:
Hello!
In this case, since the ionization of a weak acid produces a conjugate acid, molecule to which the leaving H⁺ is added to, and a conjugate base, everything that remains after the withdrawal of the H⁺, we can note down the ionization of each acid down below:
[tex]CH_3CH_2COOH\rightleftharpoons CH_3CH_2COO^-+H^+\\\\H_3PO_4\rightleftharpoons H^++H_2PO_4^-[/tex]
Thus, we notice that the answer is D. CH3CH2COO- for CH3CH2COOH; H2PO4 - for H3PO4 because the phosphoric acid is most likely to ionize to dihydrogen phosphate ions rather than phosphate, or hydrogen phosphate ions it undergoes a stepwise ionization in which the first step is the predominant one.
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9. What metric unit would be most
appropriate to use when measuring
the length of a paperclip?
a. Millimeter
b. Decimeter
c. Meter
d. Kilometer
Answer: a. Millimeter
Explanation:
A paperclip is a small device or instrument that can be used to hold the papers or stack of papers together. The length of the paperclip can be measured using millimeter. It is equal to the thousands of meters. The millimeter is a dimension which is used to measure the very small length objects which have visible scale distances and length.
Decimeter can be used to measure the length of the object smaller than paperclips. Meter and kilometers are used for objects and distances larger than paperclip.
How do I round 74,000 to have only one significant figure?
Answer:
7x10⁴.
Explanation:
Hello!
In this case, when rounding big number to a representation with less significant figures than it, we need to make sure we remove the spare figures and round up whether the next digit is five or more.
In such a way, for 74,000, we notice that 4 is not enough to round up the 7, that is why the number would contain a 7 only; moreover, to get rid of the thousand places, we need to introduce an exponent in 4 places, which means that the result would be:
7x10⁴.
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Which chemical equation is unbalanced?
C + O2 Right arrow. CO2
Sr + O2 Right arrow. 2SrO
6H2 + 3O2 Right arrow. 6H2O
H2 + H2 + O2 Right arrow. H2O + H2O
Answer:
Sr + 02 Right arrow.2Sr0
Answer:
b
Explanation:
. What were the main inventions of the industrial revolution? What changes did they bring about ?
Answer:
The Industrial Revolution was a period of great industrialization that began in the late 18th century in Britain, leading to massive population growth and agricultural innovations, which laid the foundation for increased productivity, both with increased labor and a larger market for the products. There was a revolution in the production methods of the textile industry, especially with the advent of the steam engine and urban development, the influx of people from the countryside to the cities meant that there was an abundance of labor, which laid the foundation for the industrial cities of the nineteenth century. The steam engine was also used in the new generation of transport, in locomotives and steamships. With the advent of steel as a building material along with a series of new discoveries in communication technology in the second half of the 19th century, the tone was set for the continued technological development of the 20th century.
PLSS HELP ME
Think critically, explain why some fronts produce stronger storms than others. GIVE 2 EVIDENCES PLSSS.
I WILL GIVE YOU BRAINLIEST
Which of the following would likely occur as a result of an oil spill in the ocean?
I. The levels of salt and other nutrients typically present in ocean water would greatly increase.
II. There would be no more upwelling of nutrients from cold ocean depths.
III. Humans would be less able to use fish and shellfish from the affected area as food.
IV. There would be global interruptions in the water cycle.
A. III only
B. IV only
C. I and III only
D. I, II, III, and IV
Answer:
D.
Explanation:
The Oil spill effects on environments and habitats can be catastrophic: they can kill plants and animals, disturb salinity/pH levels, pollute air/water and more. Read more about the types of oil pollution.
Statements that express occurrences as a result of oil spill in the ocean are:
C: I. The levels of salt and other nutrients typically present in ocean water would greatly increase.
III. Humans would be less able to use fish and shellfish from the affected area as food.
An oil spill can be regarded as a of release liquid petroleum hydrocarbon into the environment.This release can be on land or in the body of water especially ocean, however this spillage is very dangerous to aquatic lives which indirectly affects man.Once spillage occur, levels of salt and other nutrients will increase in the ocean and this can harm aquatic lives.especially the marine ecosystem, due to human activity, and is a form of pollution.
Therefore option C is correct.
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what is the difference between the number of electrons in an atom of selenium, Se and the number of electrons in an atom of aluminum, Al?
Answer:
Well, electrons can be converted into a atomic number so if SE atomic number is 34 that means it has 34 electrons. AI has a atomic number of 13 meaning it has 13 electrons. So the difference is that SE has more electrons then AI.
PLS HELP GIVING 100 PTS EASY SCIENCE HELP PLS
Answer:
B hope it helps
Explanation:
A gas in a sealed container has a pressure of 100 kPa at a temperature of 27 C. If the pressure in the container is increased to 20 kPa, what is the new temperature?
Answer: 32.4 C
Explanation: Gay-Lussac's Law or Third Gas Law states that for a constant volume, the pressure is directly proportional to absolute temperature: P alpha T; also stated as P/T = K, where K is a constant, and similarly, P1/T1 = P2/T2 .
Here P1= 100 kPa, P2=120 kPa (If pressure increases by 20 kPA), T1=27 C [Given]
Hence, T2= (T1*P2)/P1 = (27*120)/100=32.4 C [C is degree in Celcius]
The new temperature of the gas in the container when the pressure increased by 20 KPa is 87 °C
Data obtained from the question Initial pressure (P₁) = 100 KPa Initial temperature (T₁) = 27 °C = 27 + 273 = 300 KNew pressure (P₂) = 120 KPa New temperature (T₂) =? How to determine the new temperatureThe new temperature of the gas can be obtained as follow:
P₁ / T₁ = P₂ / T₂
100 / 300 = 120 / T₂
Cross multiply
100 × T₂ = 300 × 120
Divide both side by 100
T₂ = (300 × 120) / 100
T₂ = 360 K
Subtract 273 to obtain answer in °C
T₂ = 360 – 273 K
T₂ = 87 °C
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Isopropanol burns in oxygen to yield carbon dioxide, water, and heat. Which word equation best represents this chemical reaction?
isopropanol Right arrow. carbon dioxide + water + heat
isopropanol Right arrow. carbon dioxide + water + oxygen
isopropanol + oxygen Right arrow. carbon dioxide + water + heat
isopropanol + oxygen + heat Right arrow. carbon dioxide + water
Answer:
isopropanol + oxygen Right arrow. carbon dioxide + water + heat
Explanation:
Word equation:
isopropanol + oxygen → carbon dioxide + water + heat
Chemical equation:
2C₃H₇OH + 9O₂ → 6CO₂ + 8H₂O + Heat
The given reaction is combustion of isopropanol. Isopropanol burn in the presence of oxygen and produced carbon dioxide and water. Heat is also produced in this reaction.
The given reaction also follow the law of conservation of mass. There are equal number of moles of each element on both side of reaction equation thus mass remain conserved.
isopropanol + oxygen Right arrow. carbon dioxide + water + heat
The following information should be considered:
Word equation:
isopropanol + oxygen → carbon dioxide + water + heat
Chemical equation:
[tex]2C_3H_7OH + 9O_2 \rightarrow 6CO_2 + 8H_2O + Heat[/tex]
The given reaction is combustion of isopropanol. Isopropanol should be burn with the presence of oxygen and generated carbon dioxide and water. Heat is also generated in this reaction. The given reaction also follows the law of conservation of mass
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A 50.0mL flask filled with a solution of hydrogen peroxide has a total mass of 88.5 g. The mass of the flask is 16.5 g. The density of the hydrogen peroxide solution is
Answer:
1.44 g/mL
Explanation:
total mass is mass of the flask plus mass of the solution
TM = Flask + H2O2
88.5 = 16.5 + x
x = 72.0 gram
density = mass/volume
H2O2 density = 72/50
= 1.44 g/mL
When recommending solutions to decrease human impact, which location were you able to make the greatest positive impact? Please explain your selection by using data from the simulation.
What recommendations would you give to your local community to help to decrease the local effects of human impact on the environment? List 2 recommendations and how they will positively impact your community.
What recommendations would you give to the global governments to help decrease the global effects of human impact on the environment? List 2 recommendations and how they will positively impact our planet.
When recommending solutions to decrease human impact, which location were you able to make the greatest positive impact? Please explain your selection by using data from the simulation.
New york, 893 - 853 = 40 which is the highest quotient.
What recommendations would you give to your local community to help to decrease the local effects of human impact on the environment? List 2 recommendations and how they will positively impact your community.
Installing solar panels and replanting 2 trees for every tree that’s been cut down, this will help the atmosphere and deforestation.
What recommendations would you give to the global governments to help decrease the global effects of human impact on the environment? List 2 recommendations and how they will positively impact our planet.
Constructing using only recycled materials decreases water pollution to 823 ppm and Creating more protected areas decreases air pollution to 368 ppm this will help the environment and oxygen.
Answer:
........
Explanation:
Can I get Help with this question ♂️ please?
Answer:
Molar mass of the substance
which mineral is composed of calcium and fluorine?
Answer:
Fluorite
What is Fluorite? Fluorite is an important industrial mineral composed of calcium and fluorine (CaF2). It is used in a wide variety of chemical, metallurgical, and ceramic processes
Many organisms on Earth exhibit similar ____________.
Question 1 options:
time
single-celled
characteristics
nonliving
Answer:
characteristics
Explanation:
i promise becasue i am a teacher so i hope you like it
PLEASE HELP WHICH ONE IS IT AND CAN YOU EXPLAN HOW YOU GOT THE ANSWERS TY!!!
In a titration, a 20 mL sample of NaOH(aq) was neutralized by 14.9 mL of 0.13 mol/L
H2SO4(aq). The concentration of the base is
A)8.7 mol/L
B)10.048 mol/L
C)0.19 mol/L
D)0.35 mol/L
/L
Answer:
C)0.19 mol/L .
Explanation:
Hello!
In this case, since the chemical reaction between sodium hydroxide and sulfuric acid is:
[tex]H_2SO_4+2NaOH\rightarrow Na_2SO_4+2H_2O[/tex]
Whereas a 1:2 mole ratio is seen between the acid and the base, we can write:
[tex]2*M_{acid}V_{acid}=M_{base}V_{base}[/tex]
In such a way, we solve for the concentration of base and plug in to obtain:
[tex]M_{base}=\frac{2*M_{acid}V_{acid}}{V_{base}} \\\\M_{base}=\frac{2*0.13mol/L*14.9mL}{20mL} \\\\M_{base}=0.19mol/L[/tex]
Thus, the answer is C)0.19 mol/L
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name all nonmetals that are noble has.
PLEASE HELP ASAP ILL GIVE YOU BRAINLIEST
CHEMISTRY H E L P
In the following chemical reaction, what reactant is represented by X? AlCl₃ + X → Al(OH)₃ + NaCl
A) NaOH
B) ClOH
C) Al(OH)
D) It cannot be determined.
Answer: NAOH
Explanation:
Question 10 of In which way does a balanced chemical equation demonstrate the conservation of matter? A. It shows the same number of atoms of each element on both sides of the equation. B. It shows how the atoms of an element can appear on only one side of the equation. C. It shows the same number of molecules of each compound on both sides of the equation. D. It shows how matter can be both created and destroyed by a chemical reaction. SJEMALT
Answer:
it’s probably c
Explanation:
Answer:
C
Explanation:
I searched it up
anybody?i will appreciate it
Answer:
fat provide 9 calories per gram
A coffee cup calorimeter contains 100.0 mL of 1.50 M Ba(NO3)2 at 25.0o C. A student pours 100.0 mL of 1.50 M Na2SO4 at 25.0o C into the calorimeter. A precipitate forms and the temperature rises to 29.7o C. Assume that no heat was lost to the surroundings, the volumes were additive, the specific heat capacity of the solution was 4.184 J/gK, and the density of the solution was 1.00 g/mL.
A. This reaction could be represented as a complete ionic or a net ionic equation. Write the balanced chemical equation that should be used in association with the Delta Hrxn value for this reaction.
B. Find the amount of heat that was lost or gained by the solution in the calorimeter.
C. Find the heat of reaction, Delta Hrxn.
D. Is the reaction endothermic or exothermic?
Answer:
Ba(NO₃)₂ + Na₂SO₄ → BaSO₄ + 2NaNO₃
q = 3.93 kJ
ΔH_{rxn} = 26.2 kJ/mole
Exothermic
Explanation:
Given that:
The Volume of Ba (NO₃)₂ = 100.0 mL
The molarity of Ba (NO₃)₂ = 1.50 M
The volume of Na₂SO₄ = 100.0 mL
The molarity of Na₂SO₄ = 1.50 M
From the above, the total volume of solution = 200.0 mL
Density of solution = 1 g/mL
The balanced equation can be written as:
Ba(NO₃)₂ + Na₂SO₄ → BaSO₄ + 2NaNO₃
We know that:
Density = mass/volume
Thus;
the mass of the solution = density × volume
= 200 × 1
= 200 g
Temperature change ΔT = T₂ - T₁
ΔT = (29.7 - 25)° C
ΔT = 4.7° C
Heat capacity c = 4.184 J/gK
∴
The amount of heat lost or gained q = m× c×ΔT
q = 200 × 4.184 × 4.7
q = 3932.96 J
q = 3.93 kJ
From the above information, we can determine the number of moles of Ba(NO₃)₂ and Na₂SO₄
For Ba(NO₃)₂
number of moles = 0.10 × 1.50
= 0.15
For Na₂SO₄
number of moles = 0.10 × 1.50
= 0.15
∴
ΔH_{rxn} = q/number of moles
ΔH_{rxn} = 3.93/0.15
ΔH_{rxn} = 26.2 kJ/mole
From the reaction, we will notice that the temperature increased. This significantly implies that heat is evolved from the reaction. As such, the reaction is exothermic.