Answer:
is an assumption , in an idea that is proposed for the sake of argument so that it can be tested to see if it might be true.
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A substance is considered more efficient at storing energy when its specific heat enables it to resist changes in temperature. so, a more efficient substance will stay hotter, or cooler, for longer. based on your answers for questions 1 through 3, which substance—air or water—stores energy more efficiently under equal conditions?
Water stores energy more efficiently than air under equal conditions.
It requires more energy to heat water than it does to heat air because water has a significantly larger heat capacity and specific heat than air. Compared to air, which has a specific heat of 1.005 J/g degreesC, water has a specific heat of 4.186 J/g degreesC.
Specific heat:
The amount of heat required to raise the temperature per unit mass is known as specific heat capacity. The heat in Joules required to increase the temperature of 1 gram of sample by 1 Kelvin or degree Celsius is often stated. Water is an excellent temperature regulator since it has a very high specific heat capacity.
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Which describes the molecule shown below?
O A. Saturated alkane
B. Unsaturated alkyne
C. Saturated alkene
O D. Unsaturated alkene
Answer:
saturared alkane
because of its single bonded
When olive oil and sodium hydroxide are mixed together, soap and glycerol are made. The solubility of each of the materials are shown in the table below.
Material olive oil sodium hydroxide soap glycerol
Solubility not soluble very soluble soluble soluble
What is the best conclusion, based on the information given?
A.
This is not a chemical reaction because all of the materials mixed can be dissolved in water, and dissolving is a physical change.
B.
This is not a chemical reaction because all of the materials are liquids and can be completely dissolved in water.
C.
This is a chemical reaction because the materials that were mixed have different solubilities than the materials that were made.
D.
This is a chemical reaction because all of the materials used can be combined with water to produce a mixture.
Answer:
C
Explanation:
This is a chemical reaction because the materials that were mixed have different solubilities than the materials that were made.
Answer:
C
Explanation:
When a chemical reaction occurs, new materials form. Different materials each have unique physical properties, such as solubility.
When olive oil and sodium hydroxide were mixed together, soap and glycerol were made. The table shows that olive oil and sodium hydroxide have solubilities that are different than soap and glycerol. This means that olive oil and sodium hydroxide are different materials than soap and glycerol. Therefore, this is a chemical reaction because the materials that were mixed have different solubilities than the materials that were made.
Which of the following describes scientist?
Complete Question :
Which of the following describes scientists?
A. People with similar personalities
B. People from different backgrounds
C. People with perfect understanding of science
D. People with only one perspective
Answer :
Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct answer
What is Scientist ?
A scientist is a person who conducts scientific research to advance knowledge in an area of interest.
Scientists are motivated to work in several ways. Many have a desire to understand why the world is as we see it and how it came to be. They exhibit a strong curiosity about reality.
Therefore, Scientists can be described as People with perfect understanding of science. Hence, Option (C) is correct.
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The second part of the lab procedure focused on
particle size and also involved several factors.
Label each factor listed below as "variable" or
"constant."
Amount of water:
Reaction rate:
Temperature:
Initial amount of tablet:
Particle size:
DONE
Answer:
Amount of water- constant
reaction rate- variable
temperature- constant
initial amount of tablet- constant
particle size- variable
Explanation:
In a phase diagram,which of the following is the term used for a substance held at a temperature and pressure where the solid ,liquid and gaseous states of substance exist simultaneously? A. triple point. B. critical point. C.absolute zero. D. critical temperature
Which of the following substances is responsible for donating H+ ions to act as a buffer when blood PH rises? A. oxygen b.carbon dioxide. C.carbonic acid .d.Carbon monoxide
In a certain plant red flowers are dominant over whote flowers. A plant heterozygous for red and a plant white flower are created. Which of the following is the expected proportion of phenotypes in the next generation? A. 3 red 1 white. B. 1 red 3 white. C. 2 red 2 white d. 4 red 0 white.
If a portion of a strand of DNA bases reads AGCTAGCGT3, what would the sequence of bases on the complementary strand read?,.
Which of the following are specific immune responses (select all that apply.) a. The formation of memory B cells. B. complement proteins binding to and destroying bacteria. C. antibody production. D. endocytosis of a virus by a phagocyte lymphocyte. E. T lymphocyte activation and clonal expansion
Which of the following is a mass within the ovary that secrets hormones to maintain the uterine lining during pregnancy. A. ovidcut. B.oocyte. C. umbilical cord. D corpus luteum
A myocardial infarction affects which of the following blood vessesls of the heart? A. pulmonary. B vena cava. C.coronary d. Aorta
The correct answers are triple point, Carbonic acid, Antibody production, endocytosis of a virus by a phagocyte lymphocyte. E. T lymphocyte activation and clonal expansion, Corpus luteum and Aorta.
What is triple point?In a phase diagram, triple point is the term used for a substance held at a temperature and pressure where the solid ,liquid and gaseous states of substance exist simultaneously.
Carbonic acid is a substance that is responsible for donating H+ ions to act as a buffer when blood pH rises.
Antibody production, endocytosis of a virus by a phagocyte lymphocyte. E. T lymphocyte activation and clonal expansion are specific immune responses.
Corpus luteum is a mass within the ovary that secrets hormones to maintain the uterine lining during pregnancy.
A myocardial infarction affects Aorta blood vessels of the heart.
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Pt2 please help????
Some of the methods that can be used to prevent diseases and health problems are:
VaccinationsPracticing clean hygieneHandling food and water properly, etcWhat is Disease Prevention?This refers to the proactive measures that are taken in order to stop a disease from ever occurring.
Hence, we can see that disease prevention is important as it helps to keep a person healthy and he can do this by engaging in healthy practices such as washing of hands, etc.
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Put the following forms of visible light in order of increasing wavelength:
blue
yellow
green
Clear All
Shortest Wavelength
Second Longest
Wavelength
Longest Wavelength
Does all waves have the same wave length
Answer:
no
Every wave has a specific wavelength
Explanation:
Two interfering waves have the same wavelength
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byjus
The correct set-up for solving the following problem would be:
A concentrated solution of HCI is 11.7 M and has a density of 1.65 g/mL. What is the % by mass of HCI in this solution?
16
M HCl = 11.7 M = 11.7 mol/L = 0.0117 mol/ml
mass HCl = 36.5 g/mol x 0.0117 mol/ml =0.427 g/ml
% mass = mass HCl : density
% mass = 0.427 : 1.65 = 0.259 = 25.9%
or formula:
M = (%mass x ρ x 10) : MM
% mass = (M x MM) : (ρ x 10)
% mass = (11.7 x 36.5) : (1.65 x 10)
% mass = 25.9
Which of these ionic compounds have polyatomic ions? Check all that apply.
Need help with this
Answer:
- Nucleus Function - Controls and regulates the activity of the cell.
- Ribosome builds proteins.
- A vesicle structure is kinda like a sac filled with a fluid of sorts.
- Rough ER has ribosomes attached to the cytoplasmic side of the membrane.
- Golgi apparatus kinda looks like a "stack of peta bread"
- Golgi apparatus functions as a factory in which proteins received from the ER are further processed and sorted for transport to their eventual destinations
The cytoskeleton of a cell is made up of microtubules, actin filaments, and intermediate filaments.
- The smooth endoplasmic reticulum functions in many metabolic processes. It synthesizes lipids, phospholipids as in plasma membranes, and steroids.
- The mitochondria produced energy/ATP
- Mitochondria have a double membrane arrangement that separates the organelle into four distinct compartments
- The cytosol contains an organized framework of fibrous molecules that constitute the cytoskeleton
given the reaction below, if 0.00345 g of carbon dioxide is used up, how many grams of water will be produced?
CO2 + 2LiOH → Li2CO3 + H2O
From the stoichiometry of the reaction, 1.4 * 10^-3 g is produced.
What mass of water is produced?The equation of the reaction is written as; CO2 + 2LiOH → Li2CO3 + H2O. This can help us to apply the principle of stoichiometry here.
Thus;
Number of moles of CO2 = 0.00345 g/44 g/mol = 7.8 * 10^-5 moles
If 1 mole of CO2 produced 1 mole of water
7.8 * 10^-5 moles of CO2 produced 7.8 * 10^-5 moles of water
Mass of water produced = 7.8 * 10^-5 moles * 18 g/mol = 1.4 * 10^-3 g
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I need help with the solution
Answer:
52.6 g C₆H₆O₂
Explanation:
Unfortunately, the problem does not specify which of the reactants is the limiting reagent. This means you must convert both starting amounts into the product to identify the final answer.
To find the mass of hydroquinone (C₆H₆O₂) produced, you need to (1) calculate the molar masses of the reactants and product, then (2) convert grams of the reactants to grams of the product (via the molar masses and the mole-to-mole ratio from equation coefficients), and then (3) determine the limiting reagent and the actual answer.
(Step 1)
Molar Mass (C₆H₅OH): 6(12.011 g/mol) + 6(1.008 g/mol) + 15.998 g/mol
Molar Mass (C₆H₅OH): 94.112 g/mol
Molar Mass (H₂O₂): 2(1.008 g/mol) + 2(15.998 g/mol)
Molar Mass (H₂O₂): 34.012 g/mol
Molar Mass (C₆H₆O₂): 6(12.011 g/mol) + 6(1.008 g/mol) + 2(15.998 g/mol)
Molar Mass (C₆H₆O₂): 110.11 g/mol
(Step 2)
It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the sig figs of the given values.
45.0 g C₆H₅OH 1 g 1 mole C₆H₆O₂ 110.11 g
------------------------ x -------------- x ------------------------- x ----------------- =
94.112 g 1 mole C₆H₅OH 1 mole
= 52.6 g C₆H₆O₂
20.0 g H₂O₂ 1 mole 1 mole C₆H₆O₂ 110.11 g
------------------- x ----------------- x ------------------------- x --------------- =
34.012 g 1 mole H₂O₂ 1 mole
= 64.7 g H₂O₂
(Step 3)
The limiting reagent of the reaction is C₆H₅OH because it is not able to produce as much product as H₂O₂. As such, product stops being made as C₆H₅OH runs out, making the final amount 52.6 g C₆H₆O₂.
Answer:
See below
Explanation:
Mole weight of C6H5OH = 94 gm/mole (approx)
45 gm / 94 gm/mole = .479 Moles of phenol
Mole wt of H2O2 = 34 (approx)
20 gm / 34 gm /mole = .588 moles of hydrogen peroxide
From the equation.....it takes equal moles of these to react to produce the same number of moles of hydroquinone.....
there isn't enough phenol to match the peroxide....so phenol is limiting reactant and you will only get .479 moles of hydroquinone
hydroquinone mole weight = 110 gm / mole (approx)
.479 mole * 110 gm/mole = 52.69 gm produced
For the reaction: N2(g) + H2(g) → NH3(g)
If the rate of decrease of N2 is -0.11M/s what is the rate of increase of NH3?
I know I must first balance the equation, to which I get: N2+3H2 -> 2NH3
Where do I go from here? Please explain step by step
The rate of increase of NH3 is 0.22M/s.
What is the balanced equation of the reaction?The balanced equation of the reaction is given below:
N2(g) + 3 H2(g) → 2 NH3(g)The rate of decrease of N2 is half the rate of increase of NH3.
Rate of decrease of N2 = -0.11 M/s
Rate of increase of NH3 = 2 × +0.11 M/s = 0.22M/s.
In conclusion, the rate of formation of products is dependent on the rate of disappearance of reactants.
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arrange the sub levels in ascending order by the number of electrons they can obtain
The sub-levels in order of the number of electrons they can hold will be s, p, d, and f.
What are sub-levels?There are 4 sub-levels, namely; s, p, d, and f.
Each level represents an orbital with some orbitals having multiple degenerates.
s orbital can take a maximum of 2 electronsp orbitals can take a maximum of 6 electronsd orbitals can take a maximum of 10 electronsf orbital can take a maximum of 14 electrons.Thus, the ascending order in terms of the number of electrons each sublevel can hold will be s, p, d, and f.
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Which of the following can contribute to food spoilage
Answer:
keeping things above 40 degrees Celsius as that can fasten the rot process of fruits and vegetables
Light, oxygen, heat, humidity, temperature and spoilage bacteria can contribute to food spoilage
What is food spoilageTiny living things called microorganisms like bacteria, molds, and yeasts can get into our food and make it go bad. They can become larger in size and increase in number, causing the food to feel different, look different, smell different, and taste different.
Enzymes in food can speed up spoilage. Enzymes can break apart the nutrients in food, which can cause the food to change and become less fresh.
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A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 x 10^20 molecules
of reactant at time t = 0, how many molecules remain unreacted after 100.0 minutes?
A) 1.00 x 10^4molecules
B) 2.00 x 10^19 molecules
C) 3.20 x 10^16 molecules
D) 5.00 x 10^20 molecules
E) none of the above
Answer:
E
Explanation:
100 minutes is 5 half lives ( 100 min/20 min/half life)
= (1/2 )^5
1 x 10^20 * (1/2)^5 = 3.125 x10^18 molecules
What is the mass of 0.11 moles of sodium carbonate, Na2CO3?
Answer: 11.66g
Explanation:
Number of mole= Mass/Molar Mass
Molar Mass of Na2CO3 = (23*2)+12+(16*3)
= 106g/mol
0.11moles = Mass/(106g/mol)
Mass= 0.11*106
Mass= 11.66g
Molar mass
2(23)+12+3(16)106g/molMass:-
No of moles ×Molar mass0.11(106)11.66gI would appreciate if somebody help me please!!! Pt2 posted
The disease prevention methods are as follows:
Influenza: Avoid close contact with sick people; Cover your mouth and nose, Clean your handsSalmonella: wash hands properly; keep food area clean; cook food properlyType 2 Diabetes : exercise regularly; reduce sugar intake; quit smokingHIV/AIDS: Avoid sharing of unsterilized sharp objects; avoid unprotected sex; screen blood before transfusionHeart disease: avoid trans fat; exercise regularly; avoid smokingWhooping cough: wear face masks; wash regularly; get vaccinatedWhat is the disease prevention?Disease prevention refers to the steps taken to protect oneself from developing a particular disease.
The disease prevention methods for the given diseases is as follows:
Influenza: Avoid close contact with sick people; Cover your mouth and nose, Clean your handsSalmonella: wash hands properly; keep food area clean; cook food properlyType 2 Diabetes : exercise regularly; reduce sugar intake; quit smokingHIV/AIDS: Avoid sharing of unsterilized sharp objects; avoid unprotected sex; screen blood before transfusionHeart disease: avoid trans fat; exercise regularly; avoid smokingWhooping cough: wear face masks; wash regularly; get vaccinatedIn conclusion, disease prevention is the best policy in health care.
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12. Explain the terms as used in potentiometric analysis (i) Accuracy (ii) Precision (iii) Sensitivity (iv) Selectivity 10marks
Precision refers to solute value, sensitivity is the ability to sense a change in solution, whereas accuracy and selectivity refer to the ability to detect the solute.
What is potentiometric titration?Potentiometric titration refers to a chemistry analytical strategy used to identify a particular substance, which may be a solute in the solution.
A potentiometric analysis is based on the use of electrodes capable of recording different values of the titrant substance, which enables the determination of the concentration of a given solute.
In conclusion, precision refers to solute value, sensitivity is the ability to sense a change in solution and accuracy and selectivity refer to the ability to detect the solute.
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The radioactive isotope 210/84 Po decays by alpha emission.
If the mass of a sample of polonium-210 decays from 98.3 micrograms to 12.3 micrograms in 414 days, what is the half-life of polonium-210?
Half-life = ________ days
The half-life of polonium-210, given that it decays from 98.3 micrograms to 12.3 micrograms in 414 days is 138 days
How to determine the number of half-lives Original amount (N₀) = 98.3 microgramsAmount remaining (N) = 12.3 microgramsNumber of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 98.3 / 12.3
2ⁿ = 8
2ⁿ = 2³
n = 3
How to determine the half life Number of half-lives (n) = 3Time (t) = 414 daysHalf-life (t½) = ?
t½ = t / n
t½ = 414 / 3
t½ = 138 days
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The half life of the polonium-210 is 138 days.
What is Half-Life?The half-life is the time taken for half the sample to decay.
It takes 414 days for 98.3 g of to decay from 98.3 micrograms to 12.3 micrograms.
The fraction of 98.3 that is 12.3 g = 98.3/12.3 = 1/8
The sample has undergone 3 half-lives.
The half-life = 414/3 = 138 days.
In conclusion, it takes 138 days for half the sample to decay.
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Do step 3 as outlined in the lab guide. Record your results in the appropriate blanks.
A =
B =
C =
D =
E =
F =
G =
H =
The simulated value of the number of atoms are as follows:
A = 27, B = 16, C = 9, D = 4, E = 2, F = 2, G = 0 and H = 0.
What is the half-life of a radioactive element?The half-life is the time taken for half the number of atoms in a given sample of the element to disintegrate or decay.
The expected amount of the sample left after a given number of half-lives is given in the table.
The simulated value of the amounts are found to be:
A = 27, B = 16, C = 9, D = 4, E = 2, F = 2, G = 0 and H = 0.
In conclusion, the expected number of atoms and the simulated values of the number of atoms differed slightly.
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a 1.642 g sample of calcium bromide is dissolved in enough water to give 469.1 mL of solution what is the bromide ion concentration in this solution
The bromide concentration in this solution of calcium bromide dissolved in enough water to give 469.1 mL is 1.75 × 10-⁵M.
How to calculate concentration?The concentration of a solution can be calculated by dividing the number of moles of the substance by its volume.
No of moles of calcium bromide is calculated as follows:
moles = 1.642 ÷ 199.89 = 8.215 × 10-³moles
Molarity = 8.215 × 10-³moles ÷ 469.1mL = 1.75 × 10-⁵M
Therefore, the bromide concentration in this solution of calcium bromide dissolved in enough water to give 469.1 mL is 1.75 × 10-⁵M.
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Anybody know the answer to this
An atom's mass is determined by its protons and neutrons.
An atom's charge is determined by its number of protons minus it number of electrons.
Atoms become cations, or positively charged when they lose an electron, and since electrons have a negative charge, they become anions, or negatively charged.
Water is a universal solvent.
Carbohydrates (carbs) are used by the body for energy.
Steroids and triglycerides are lipids.
Proteins that catalyze chemical reactions are called enzymes.
3750 J of heat were added to sample of magnesium with an unknown mass. If the temperature ofthe sample increased by 23 °C, what is the mass of the sample? (The specific heat of magnesium is 1.02 J/g. Celsius.
Taking into account the definition of calorimetry, the mass of the sample is 159.85 grams.
What is calorimetryIn first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .).
The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance.ΔT is the temperature variation.Mass of the sampleIn this case:
Q= 3750 Jc= 1.02[tex]\frac{J}{gC}[/tex]m= ?ΔT= 23 CReplacing in the expression to calculate heat exchanges:
3750 J= 1.02 [tex]\frac{J}{gC}[/tex]× m× 23 C
Solving:
m= 3750 J ÷ (1.02 [tex]\frac{J}{gC}[/tex]× 23 C)
m= 159.85 grams
In summary, the mass of the sample is 159.85 grams.
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Consider the equation below.
Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)
Which compound is the gas in this chemical reaction?
O Mg
O HCI
O MgCl₂
OH₂
Answer:
H2(hydrogen gas)
Explanation:
The reaction between magnesium and hydrochloric acid combine to form a salt (magnesium chloride) and release gas (hydrogen).
Hidrocarburos alcanos ejemplos del 30 al 100
Explanation:
Metano: CH₄; Etano: C₂H₆; Propano: C₃H₈; Butano: C₄H₁₀; Pentano: C₅H₁₂; Hexano: C₆H₁₄; Heptano: C₇H₁₆; Octano: C₈H₁₈; Nonano: C₉H₂₀; Decano
The volume of 0.6305 kg of a liquid is 0.430 L. What is its density in g/mL
Answer: 1.466 g/mL
Explanation:
[tex]\frac{0.6305 \text{kg}}{0.430 \text{L}} \cdot \frac{1000 \text{g}}{1 \text{kg}} \cdot \frac{1 \text{L}}{1000 \text{mL}} = 1.466 \,\frac{\text{g}}{\text{mL}}[/tex]
Which of the following does NOT demonstrate the law of conservation of matter?
check all that apply
The one that does not demonstrates the law of conservation of matter would be the third option: [tex]2NO_2 + H_2O -- > HNO_3 + HNO_2[/tex]
What is law of conservation of matter?It is a law that explains that matters are conserved during the course of chemical reactions. They can neither be destroyed nor created.
Thus, the number of moles of the species in a reaction remains the same before and after the reaction.
Thus, an equation that demonstrates the law of conservation of matter will be balanced in terms of the number of moles of species.
The only equation, in this case, is [tex]2NO_2 + H_2O -- > HNO_3 + HNO_2[/tex]
There are 3 oxygen species on the reactant while 5 are present on the product side.
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