Answer:
Some differences between the given particular topics are described below.
Explanation:
Hydrolysis occurs as the water is absorbed in some kind of a response to breaking up the polymer through its corresponding monomers while Dehydration synthesis happens whenever water has been formed as a formation of the polymerization of the latter's corresponding monomers.Hydrolysis seems to be a method during which a chemical bond becomes dissolved by a water molecule while Dehydration would be a state of consuming less liquid than that of the natural rate.The Skeletal System does all of the following except:
Produces Blood Cells
Protects Organs
Stores calcium and minerals
Excretes Waste
The skeletal system does not excrete waste. Therefore, option D is correct.
What is the skeletal system ?The skeletal system is our body's central framework. It is also known as the musculoskeletal system. The skeletal system consists of bones and tendons, and ligaments, connective tissue, including cartilage.
The skeletal system plays an important role in support and protection for the body's internal organs and gives the muscles a point of attachment.
Our circulatory system delivers oxygen-rich blood to your bones. Our skeletal system is depend on our urinary system to remove waste produced by bone cells. The bones of your skeleton create a structure that protects our urinary bladder. Our circulatory system delivers oxygen-rich blood to your bones.
Thus, option D is correct.
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Most of the energy used in the United States comes from
Answer:
Energy in the United States comes mostly from fossil fuels: in 2010, data showed that 25% of the nation's energy originates from petroleum, 22% from coal, and 22% from natural gas.
Explanation:
It is really self explanitory
A solute added to a solvent raises the boiling point of the solution because: Select one: a. The solute particles raise the solvent's vapor pressure, thus requiring a higher temperature to cause boiling. b. The temperature to cause boiling must be great enough to boil not only the solvent but also the solute. c. The solute increases the volume of the solution, and an increase in volume requires an increase in the temperature to reach the boiling point (derived from PV
Answer:
See the answer below
Explanation:
The correct answer would be that the solute particles lower the solvent's vapor pressure, thus requiring a higher temperature to cause boiling.
Dissolving a solute particle in a solvent leads to a decrease in the vapor pressure of the solvent above the resulting solution when compared to the pure solvent. The lower the vapor pressure of a liquid, the higher the temperature required for the liquid to boil and vice versa. Hence, a higher temperature would be needed to boil a solvent with dissolved solutes.
1. The process of photosynthesis requires a source of carbon dioxide.
HYPOTHESIS: Increasing the concentration of carbon dioxide available to aquatic plants will increase
the rate of photosynthesis, as measured by the number of oxygen bubbles produced.
Independent variable:
Dependent variable:
Answer:
The rate of photosynthesis is the dependent and concentration of carbon dioxide is the independent
Explanation: The rate of photosynthesis depends on how much carbon dioxide is being supplied which makes it the dependent variable.
Hope this helped! :)
Use your periodic table to answer the following questions. Pay attention to the spelling of the element names and make sure to write the chemical symbols correctly. 1. What metal is found in the group 1 and period 4? __________________ 2. What metalloid is found in the group 16 and period 5? ______________ 3. What nonmetal is found in the group 17 and period 2? ______________ 4. In what group will you find copper? ____________________ 5. In what group will you find krypton? ____________________ 6. In what group will you find mercury? _______________________ 7. What is the symbol for chlorine? ___________________ 8. What is the symbol for lead? _____________________ 9. What is the symbol for tungsten? ______________________ 10. What is the symbol for antimony? _______________________ 11. What is the symbol for sodium? ______________________ 12. In what period will you find gold? __________________________ 13. In what period will you find silver? _________________________ 14. In what period will you find oxygen? _________________________ 15. In what groups will you find metalloids? ______ ______ _____ _____ 16. What element has the symbol H? _______________________ 17. What element has the symbol He? _______________________ 18. What element has the symbol Ca? ________________________ 19. What element has the symbol Co? ________________________ 20. What element has the symbol C?
Explanation:
1. K (Potassium)
2. Te (Tellurium)
3. F (Flourine)
4. group 11, period 4
5. group 18, period 4
6. group 12, period 6
7. Cl
8. Pb
9. W
10. Sb
11. Na
12. period 6, group 11
13. period 5, group 11
14. period 2, group 16
15. Groups 13–16 of the periodic table contain one or more metalloids
16. Hydrogen
17. Helium
18. Calcium
19. Cobalt
20. Carbon
1. K (Potassium)metal is found in the group 1 and period 4.
2. Te (Tellurium) metalloid is found in the group 16 and period 5.
3. F (Flourine)nonmetal is found in the group 17 and period 2.
4. Group 11, period 4 group will you find copper.
5. Group 18, period 4 group will you find krypton.
6. Group 12, period 6 group will you find mercury.
7. Cl is the symbol for chlorine.
8. Pb the symbol for lead.
9. W the symbol for tungsten.
10. Sb is the symbol for antimony.
11. Na is the symbol for sodium.
12. Period 6, group 11 period will you find gold.
13. Period 5, group 11 period will you find silver.
14. Period 2, group 16 of the periodic table contain one or more metalloids.
15. Groups 13–16 groups will you find metalloids.
16. Hydrogen element has the symbol H.
17. Helium element has the symbol He.
18. Calcium element has the symbol Ca.
19. Cobalt element has the symbol Co.
20. Carbon element has the symbol C.
What is mixture and compound?In chemistry mixture is a combination of two or more different chemical elements which are not chemically bond. A mixture is the physical combination of two or more elements in which their individual identities are retained and it also mixed by solutions, suspension and colloids.
In chemistry compound is combination of two or more different elements which are chemically bond. So compound is held by chemical bond. A compound can't be separate by physical separation and after the mixture you can't identified that it is compound or not.
Therefore, 1. K (Potassium)metal is found in the group 1 and period 4.
2. Te (Tellurium) metalloid is found in the group 16 and period 5.
3. F (Flourine)nonmetal is found in the group 17 and period 2.
4. Group 11, period 4 group will you find copper.
5. Group 18, period 4 group will you find krypton.
6. Group 12, period 6 group will you find mercury.
7. Cl is the symbol for chlorine.
8. Pb the symbol for lead.
9. W the symbol for tungsten.
10. Sb is the symbol for antimony.
11. Na is the symbol for sodium.
12. Period 6, group 11 period will you find gold.
13. Period 5, group 11 period will you find silver.
14. Period 2, group 16 of the periodic table contain one or more metalloids.
15. Groups 13–16 groups will you find metalloids.
16. Hydrogen element has the symbol H.
17. Helium element has the symbol He.
18. Calcium element has the symbol Ca.
19. Cobalt element has the symbol Co.
20. Carbon element has the symbol C.
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What is convention? (not politically)
Answer:
a way in which something is usually done, especially within a particular area or activity.
Explanation:
How much fluid from the 1:5 dilution has to be transferred to the second microcentrifuge tube containing 900 L buffer to prepare a 1:50 dilution? a. 200 ML b. 100 ML c. 10 ML d. 50 ML
Answer: i think it's d 50 ML
Explanation:
100 mililiters of the 1 : 5 dilution must be transferred to the second microcentrifuge tube containing 900 mililiters buffer to prepare a 1 : 50 dilution. (Correct answer: B)
Reminder - The question has a typing mistake, correct form is presented below:
"How much fluid from the 1 : 5 dilution has to be transferred to the second microcentifuge tube containing 900 mL buffer to prepare a 1 : 50 dilution?"
We can estimate the quantity of the 1 : 5 dilution by means of the Principle of Mass Conservation and definition of Concentration, which are represented by the following expression:
[tex]c_{1}\cdot V_{1} = c_{2} \cdot V_{2}[/tex] (1)
Where:
[tex]c_{1}[/tex] - Initial concentration, in units solute to unit solution.[tex]c_{2}[/tex] - Final concentration, in units solute to unit solution.[tex]V_{1}[/tex] - Initial volume of solution, in mililiters.[tex]V_{2}[/tex] - Final volume of solution, in mililiters.If we know that [tex]c_{1} = \frac{1}{5}[/tex], [tex]V_{1} = x[/tex], [tex]c_{2} = \frac{1}{50}[/tex] and [tex]V_{2} = x + 900[/tex], then the amount to be transferred to the buffer is:
[tex]\frac{1}{5} \cdot x = \frac{1}{50}\cdot (x+900)[/tex]
[tex]10\cdot x = x + 900[/tex]
[tex]9\cdot x = 900[/tex]
[tex]x = 100[/tex]
100 mililiters of the 1 : 5 dilution must be transferred to the second microcentrifuge tube containing 900 mililiters buffer to prepare a 1 : 50 dilution. (Correct answer: B)
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2. Can the "facts” of science change over time? If so, how
Answer:
Yes
Explanation:
Some scientific facts are still under investigation of why it is true or not;i.e, science made us to believe that human evolution first started in the Sahara of East Africa which we don't know if it's true or not, but that's what the scientists said. And as of present days the new generations of scientists are still trying to testify if the facts are true, so it might change once their researches proved another facts differ from what we were taught.
The correct chemical equation for the reaction of sodium bromide and lead nitrate is: _________.
a. NaBr(aq) + Pb(NO3)2aq) ---------->PbBr2ts) + NaNO3(aq)
b. NaBr(aq) + Pb(NO3)2----------> PbBr2(aq) + NaNO3(s)
c. 2 NaBr(aq) + Pb(NO3)2(aq)---------> PbBr2(aq) + NaNO3(s)
d. 2 NaBr(aq) + Pb(NO3)2(aq)---------> PbBr2 + NaNO3(aq)
Answer : The correct chemical equation is:
[tex]2NaBr(aq)+Pb(NO_3)_2(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)[/tex]
Explanation :
Balanced chemical equation : It is defined as the equation in which the atoms of individual elements present of reactant side must be equal to the product side.
According to the question, when sodium bromide reacts with lead nitrate then it reacts to give sodium nitrate and lead bromide as a products.
The balanced chemical equation will be:
[tex]2NaBr(aq)+Pb(NO_3)_2(aq)\rightarrow PbBr_2(s)+2NaNO_3(aq)[/tex]
For each image, select the state of matter represented.
Answer:
need image
Explanation:
The images most likely associated with this question are honey, salt, and oxygen. Honey is a liquid, salt is a solid, and oxygen is a gas.
(The pictures below are associated with this question.)
oxygen.
5. What role do chloroplasts and chlorophyll play in a plant cell?
how do cultures form?
Explanation:
Human cultures, as communities of individuals, form when boundaries begin to occur within such communities, and when, through both adaptive and neutral mechanisms, the traits of each community—from language to decoration to technology—begin to diverge.
Societies are formed of our social groupings at varied levels, from small towns, through countries, to broader cultural groupings such as a Western society. Within such societies people tend to form particular cultures, formed of the ideas, customs, and social behaviors that make one society distinct from another.
K₂SO₄(aq) + SrI₂(aq) → 2KI(aq)+ SrSO₄(s) net ionic equation
Answer:
SO4 (aq) + Sr (aq) >> SrSO4 (s)
Explanation:
K+1 SO4-2 + Sr +2 I2- >> sK +1
(you dont separate and write down the ions for Sr SO4 because its a solid)
Cancel out the same ions from both sides and write down what your left with.
Hot coffee with sugar (completely dissolved) is classified as?
Which is not a compound
A.Sugar
B.Water
C.Gold
D.Silicon dioxide
Answer:
C
Explanation:
thats my guess but im not completely sure
The element gold has a consistent melting point and color regardless of the physical changes that it goes through. This identifies gold as what type of substance?
Group of answer choices
A mixture
A physical property
A pure substance
A compound
Answer:
C
Explanation:
The element gold has a consistent melting point and color regardless of the physical changes. This identifies gold as a pure substance. The correct option is C.
What are pure substances?Pure substances are those that are made up of only one type of atom, and nothing is mixed in these substances. They are only one type of particle. They have fixed mass and structure.
Gold is an element that has an atomic number of 79. It is a bright yellow colored and shiny metal. It is used to make an ornament, which is made by mixing other metal to it.
Elements and compounds are subclasses of pure substances. A material that solely contains one type or class of atom is said to be an element. Gold is a pure substance, it is made by one type of atom which is Aurum (Au).
Thus, the correct potion is C. A pure substance.
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Element (20X) in the periodic table exist in:
It occurs in oxygen I think
Suppose you place a hot pack into a vacuum chamber and the hot pack caused the temperature to rise from 21 degrees to 23 degrees Celsius. If the
pressure was initially 1 atmosphere, what equation would you use to determine the new pressure at the new temperature? Assume volume, and quantity of
gas are held constant.
Select one:
a. P1/T1 = P2/T2
b. P1V1 = P2V2
c. P1T1 = P2T2
d. P1n1 = P2N2
Answer:
A
Explanation:
Pressure and Temperature have to be divided by each each other because they are directly related.
Find volume of an object with the mass of 7.9g in the density of 2.28g/ ml
Answer:
The answer is
3.46 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} [/tex]
From the question
mass = 7.9 g
density = 2.28 g/mL
The volume is
[tex]volume = \frac{7.9}{2.28} \\ = 3.46491228[/tex]
We have the final answer as
3.46 mLHope this helps you
What is the best way to make sure an experiment is precise?
Are all molecules of a particular substance alike?
Answer:
Yes.
Explanation:
Yes, all molecules of a particular substance are similar or alike if the substance has similar shape and structure. Molecule is made up of two or more atoms having no charge on them and the atoms present in it make bonds with each other. For example, water is made of similar molecules i. e. two hydrogen atom and one oxygen atom bonded together with a covalent bond.
The table below shows some information about four different elements.
Element
Classification
Density (g/cm³)
barium (Ba)
metal
3.6
beryllium (Be)
metal
1.8
chromium Cr)
metal
7.2
phosphorus P)
nonmetal
1.8
A cube of an unknown element has a shiny, silvery color. The side of the cube measures 2.0 cm and the cube has a mass of 14.56 g.
Based on the information in the table, which element makes up the cube?
barium
beryllium
chromium
phosphorus
Answer:
beryllium
Explanation:
Earth's gravitational potential energy: GPE = mgh = Gravity (9.81m/s2) Mass (kg) x Height (m) Kinetic energy: KE = mu? How do the mass and height of an object affect the gravitational potential energy? O A. Mass and height have the same effect on gravitational potential energy. O B. Mass has a greater effect than height on gravitational potential energy O C. Height has almost 10 times the effect on gravitational potential energy that mass has. D. Height has a greater effect than mass on gravitational potential energy.
Answer:
A
Explanation:
Earth's garvitational energy is directly proportinal to the mass and hight of a body. Thus mass and height have the same effect on gravitational potential energy.
What is gravitational potential energy ?Gravitational potential energy is the energy stored in a massive body relative to its position in gravitational field.
The gravitational potential energy of a massive body can be determined relative to the position of another body affected by gravity. As per the equation for gravitational potential energy i.e., Mgh, both height and mass of a body has equal influence on its gravity.
If and object falls from a large height it experience higher gravity. Similarly more massive body is largely affected by gravity.
Therefore, both mass and height have the same effect on gravitational potential energy
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Answer each part below.
A. Which organism labeled in this food web provides energy, either directly or indirectly, to all of the other organisms? Explain why this is your answer.
B. Explain why the amount of food available to the slug population might increase if the aphid population decreased.
Answer:
A- producers provide energy to all of the other organisms. they directly supply energy to primary consumers (animals who eat plants). They indirectly supply energy to other consumers by feeding the animals that they eat. The energy gets transferred from the producers to the primary consumers, to the secondary consumers, and to the tertiary consumers.
B- aphids and slugs both eat producers. if the aphid population decreases, there will be less competition for the slugs to eat the their food.
The pKa of a weak acid can be determined from its titration curve.a. Trueb. False
Answer:
a. True
Explanation:
Yes, the titration curve can determine or can reveal the pKa value of a weak acid.
Titration is a scientific method to estimate the dissolved substance concentration, known as the titrand, in a known volume when it reacts with another chemical substance of known volume as well as concentration. The other substance is known as Titrant.
When a weak acid like acetic acid is titrated to a very strong base such as NaOH, the titration curve is obtained and the pH value is noted. But the titration curve of any weak acid shows a characteristic shape. At the end of titration, the acetic acid will convert into acetate ions.
pKa is the negative logarithm of the Ka of the acid. pKa is the pH of the acid where the concentration of the weak acid as well as the conjugate base is in equimolar concentration.
Why does density increase with more helium
Answer:
density increases with more helium because of its molar mass
George washes dishes with a new scented dish soap. After washing the dishes, he thinks they
are cleaner using the new scented soap. What can he do to be sure that the new scented
dish soap cleans his dishes better than the old dish soap?
Hint: You will want to set up an experiment, think about all the variables.
1 point-answer attempted
2 points – set up experiment
2 points – correctly identified variables
Answer:
Please find the set up of the experiment below
Independent variable: DISH SOAP
dependent variable: Cleanliness of the dishes
Explanation:
In order for George to be sure that the new scented dish soap cleans his dishes better than the old dish soap, he will set up an experiment using the scientific method.
The scientific method has the following steps:
1) Ask a question: Every scientific experiment starts with a question. I'm this case, George will ask the question that: Does the new scented dish soap clean dishes better than the old dish soap?
2) Formulate a hypothesis: A hypothesis is a testable explanation to an asked question or observed problem. A hypothesis in this case will be: IF the new scented dish soap is used, THEN dishes will be cleaner.
3) Test hypothesis: A hypothesis is tested by conducting an experiment. In this experiment, George will compare the effect of the old dish soap to that of the new scented soap. He will wash a group of plates with the old dish soap and wash another group with the new scented soap. He will then compare how clean the groups of dishes are.
In this experiment, the INDEPENDENT VARIABLE, which is the variable George manipulates is the DISH SOAP while the DEPENDENT VARIABLE, which is the variable George measures is the CLEANLINESS OF THE DISHES.
The control group is the group of dishes washed with the old dish soap while the experimental group is the group of dishes washed with the new scented dish soap.
The control variables of this experiment can be the same type of plates, same color of plates, same type of food eaten with the dishes etc.
4. Conclusion: Concluding in an experiment involves accepting or rejecting the hypothesis depending on the outcome of the experiment. If the outcome aligns with the hypothetical statement, the hypothesis will be accepted but if otherwise, it will be rejected.
For the following reaction, 8.00 grams of silicon tetrafluoride are allowed to react with 7.40 grams of water. silicon tetrafluoride (s) + water (l) hydrofluoric acid (aq) + silicon dioxide (s) What is the maximum amount of hydrofluoric acid that can be formed? grams What is the FORMULA for the limiting reagent? H2O What amount of the excess reagent remains after the reaction is complete? grams
Answer:
For the following reaction, 8.00 grams of silicon tetrafluoride are allowed to react with 7.40 grams of water. silicon tetrafluoride (s) + water (l) hydrofluoric acid (aq) + silicon dioxide (s) What is the maximum amount of hydrofluoric acid that can be formed? grams What is the FORMULA for the limiting reagent? H2O What amount of the excess reagent remains after the reaction is complete? grams
GOLF BALL PROPERTIES 1. Gabriel uses these numbers to find the density of the golf balls. Water has a density of 1.0 g/cm3. Which ball will float? (D = m/V) Ball Mass (g) 22 18 Volume (cm) 20 20 a) Ball A b) Ball B c) Ballc d) Ball D 30 OA 20 20 33
Answer:
ball B
Explanation:
Ball B with a density of 0.9 g/cm³ will float in water.
Option B is the correct answer.
What is density?Density is mass per unit volume.
Its unit is given as g/cm³.
We have,
The density of Ball A.
= 22 g / 20 cm³
= 1.1 g/cm³
The density of Ball B.
= 18 g / 20 cm³
= 0.9 g/cm³
Now,
Since the density of water is 1.0 g/cm³,
The ball that will float is the one with a density of less than 1.0 g/cm³.
Therefore,
Ball B with a density of 0.9 g/cm³ will float in water.
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A chef is testing out new iron cookware. He knows that iron has a specific heat of
445 J/kg°C. He heats a 2 kg iron skillet on stove for 5 minutes and finds that the
temperature of the iron skillet has increased by 250°C. What change in
temperature will the Chef observe when he heats his 4 kg iron skillet on the same
stove for the same amount of time?
A. An increase of 125°C
B. An increase of 250°C
C. An increase of 325°C
O D. An increase of 445°C
He knows that iron has a specific heat of 445 J/kg°C. He heats a 2 kg iron skillet on stove for 5 minutes and finds that the temperature of the iron skillet has increased by 250°C An increase of 250°C change in temperature will the Chef observe when he heats his 4 kg iron skillet on the same stove for the same amount of time.
What is specific heat ?Specific heat can be defined as the measurable amount of heat needed to increase the temperature of one gram of a substance by one degree Celsius of temperature.
The units of specific heat can be represented as calories or joules per gram per Celsius degree where as 1 calorie per gram per Celsius degree.
Specific heat capacity= Heat quantity/ mass × change in temperature.
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