Answer:
This question contains a lot of subsections. Please find the variables to each question below
Explanation:
Hypothesis is a testable explanation to a scientific question. It aims at proffering a testable solution to an observed problem. It usually goes in an IF, THEN format.
Dependent variable is the variable being measured in an experiment, while the independent variable is the variable that is manipulated or changed by the experimenter.
The control group is the group that does not receive the experimental treatment while constant is the variable that is kept unchanged for all groups in the experiment.
Based on this explanation, find the answers to the hypothesis, independent variable, dependent variable, constant, and control groups to each question.
2. Dependent variable: How easy it is to remember
Independent variable: Color of the text
Control: Group given Black and White text to read
Constants: Same text
3. Hypothesis: If the temperature is increased, THEN the speed of ants increases or move faster
Independent variable: TEMPERATURE
Dependent variable: SPEED OF ANTS
Control: Ants placed in room temperature
Constants: SAME KIND OF ANTS
4. Hypothesis: IF the pH of the soil is acidic or alkaline, THEN the growth of strawberries will be inhibited
Independent variable: pH of soil
Dependent variable: Growth of strawberries
Control: Strawberries grown in a Neutral pH soil
Constants: Same type of plants (strawberries)
5. Hypothesis: IF caffeine is taken, then the blood pressure will be increased or raised.
Independent variable: CAFFEINE
Dependent variable: BLOOD PRESSURE
Control: Group given no caffeine
Constants: Same amount of caffeine
6. Hypothesis: IF music is played, THEN the heart rate increases
Independent variable: MUSIC
Dependent variable: HEART RATE
Control: Groups placed where no music is played
Constants: Same type of music, same time music runs for etc.
7. Hypothesis: IF bleach is present/used, THEN bacteria will die
Independent variable: Bleach
Dependent variable: Death of bacteria
Control: Bacteria given no bleach
Constants: Same species of bacteria, Same type of bleach
Six atoms of the peptide bond group are always planar due to the ____________. Dipole of amide linkage of a peptide bond is due to partially ___________charged carbonyl oxygen and partially ___________ charged amide nitrogen. Select one: a. phi and psi angles; negatively; positively b. trans position between amide hydrogen and carbonyl oxygen; positively; negatively c. resonance structure; negatively; positively d. resonance structure; positively; negatively e. trans position between amide hydrogen and carbonyl oxygen; negatively; positively
Answer:
D
Explanation:
Resonance because the lone pairs undergo resonance due tothe partial bond relationship BTW Carbon - Nitrogen bond so the bond length shortens making the six atoms of peptide bond planar
And positive because The dipole of amide linkage of a peptide bond is as a result of the partially positively charged carbonyl oxygen and partially positively charged amide oxygen.
And the negative because The carboxylic acid group -COOH is an acid donates H+ and -NH2 being a base is H+ so causes a partial negative charge to develop on -COO(-) and partial positive charge to develop on -NH3(+).l
Which of the following is a positively charged subatomic particle?
Electron
Neutron
Nucleus
Proton
What element is CU?plz helpppp
Separate the list P, F, V, v, rho, T, a, m, L , and t into intensive properties, extensive properties and non-properties.
Answer:
Generally intensive properties are properties that are dependent on mass
So from the list given in the question we see that
P => pressure
V => volume
[tex]\rho[/tex] => density
T => tension
Are intensive properties
Generally extensive properties are properties that are increase or decreased by mass i.e that scale with mass i.e the are properties that their value is proportional to the quantity of matter(mass) in the system
So from the list given in the question we see that
m => mass
V => volume
Non -properties are
F => Force
a = > acceleration
L => length
t => time
v => velocity
Explanation:
As per the question separate the P, V, F, v and rho and T a and m and L then we have intensive properties and an extensive property and a non extensive property
Generally intensive properties are properties that are dependent on mass So from the list given in the question we see that P => pressure V => volume D => density T => tension Are intensive properties.Learn more about the list P, F, V, v, rho, T, a, m, L.
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Which of these is a chemical property of a material?
density
flammability
color
brittleness
Answer:
Flammability.
Explanation:
Chemical properties of a substance are properties of a substance that occur in the chemical reactions in which it is involved. These are the basis for the classification of substances, such as metals, halogens, acids, alcohols, alkenes, arenes, etc. A class of substances is characterized by chemical properties common to that group. Differences in the chemical and physical properties of substances allow the substance to be identified, and the components of a mixture of substances to be separated and purified.
The chemical properties of a substance are its chemical stability, reactivity, oxidizability, acidity, bromine number, polymerisability, flammability, toxicity, etc. These can be determined by chemical exposure.
Question 1 2 pts This question is worth 2 points. Using the ruler included below, how long are these crucible tongs?
The radius of a uranium atom is 149 pm. How many uranium atoms would have to be laid side by side to span a distance of 1.66 mm?
Given :
Radius of uranium atom , [tex]R=149\ pm = 149\times 10^{-12}\ m[/tex] .
To Find :
How many uranium atoms would have to be laid side by side to span a distance of 1.66 mm .
Solution :
Diameter of uranium atom :
[tex]D=2r=2\times 149\times 10^{-12}\ m\\\\D=298\times 10^{-12}\ m[/tex]
Number of atoms are :
[tex]n=\dfrac{D}{d}\\\\n=\dfrac{1.66\times 10^{-3}\ m}{ 298\times 10^{-12}\ m}\\\\n=5.57\times 10^{6}[/tex]
Hence , this is the required solution .
What assumptions do we make in order to use the Henderson-Hasselbalch equation? a. Both the weak acid and its conjugate base are present initially. b. x (or the change in the reaction) is approximately zero, that is we use the weak acid approximation. c. The final and initial concentration of the acid and it's conjugate base are approximately equal, that is we use the weak acid approximation. d. We only have the weak acid initially.
Answer:
The final and initial concentration of the acid and it's conjugate base are approximately equal, that is we use the weak acid approximation.
Explanation:
The Henderson-Hasselbalch is used to calculate the pH of a buffer solution. It depends on the weak acid approximation.
Since the weak acid ionizes only to a small extent, then we can say that [HA] ≈ [HA]i
Where [HA] = final concentration of the acid and [HA]i = initial concentration of the acid.
It also follows that [A^-] ≈ [A^-]i where [A^-] and[A^-]i refer to final and initial concentrations of the conjugate base hence the answer above.
Electrons are embedded in a mass of positively
charged matter.
Answer:
plum pudding model .
Explanation:
the electrons were 'like plums embedded in a pudding'. Also called the Raisin Bread Model.
Scientific explanations
can include supernatural explanations
cannot include supernatural explanations
must include supernatural explanations
O must show supernatural forces do not exist
I think that it's cannot include supernatural explanations, or C.
If i got it wrong sorry
An unidentified solid substance has a mass of 769.09 grams and a volume of 17.38 cm/3 What is the density of this substance?
Answer:
The answer is
44.25 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass of substance = 769.09 g
volume = 17.38 cm³
The density is
[tex]density = \frac{769.09}{17.38} \\ \equiv44.2514384...[/tex]
We have the final answer as
44.25 g/cm³Hope this helps you
what is the answer to this^
Your answer would be D.
What is the best definition of physics?
A. The study of different kinds of matter and how they react with
each other
B. The study of how energy and matter interact in the physical world
C. The study of the laws of nature
D. The study of how matter is used in living things
SUNMIT
Where are the most reactive elements on the periodic table? What makes one element more reactive than another?
These elements are located in the upper right and lower left corners of the periodic table and in certain element groups. The halogens, alkali metals, and alkaline earth metals are highly reactive. The most reactive element is fluorine, the first element in the halogen group.
Changes in the temperature of an ice cube taken every minute for 15 minutes line graph scatter plot bar graph histogram
Answer:
1st part: line graph
2nd part: bar graph
Explanation:
edge, yw!
When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. Therefore, 1st part is line graph and 2nd part is bar graph.
What is phase transition?Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.
During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing. 1st part is line graph and 2nd part is bar graph.
Therefore, 1st part is line graph and 2nd part is bar graph.
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A 1.00 kg sample of water at 9.00°C is in a calorimeter. You drop a piece of steel with a mass of 0.370 kg at 210°C into it. After the sizzling subsides, what is the final equilibrium temperature (in °C)? (Make the reasonable assumptions that any steam produced condenses into liquid water during the process of equilibration and that the evaporation and condensation don't affect the outcome.)
Answer:
The final temperature of the water-steel system is 16.853 ºC.
Explanation:
We consider the system of water sample and the piece of steel as control mass, which is supposed to be an isolated system, that is, a system with no mass and energy transfer with surroundings. As water has more mass and a higher specific heat that piece of steel, it is very unlikely that evaporation and condensation would affect the outcome.
The piece of steel is cooled down while water is heated up, until thermal equilibium is reached. By First Law of Thermodynamics, we must observe that:
[tex]Q_{water}-Q_{steel} = 0[/tex]
[tex]Q_{water} = Q_{steel}[/tex]
Where:
[tex]Q_{water}[/tex] - Heat received by the water sample, measured in joules.
[tex]Q_{steel}[/tex] - Heat released by the piece of steel, measured in joules.
Now, we expand each term by definition of sensible heat:
[tex]m_{w}\cdot c_{w}\cdot (T-T_{w,o})=m_{s}\cdot c_{s}\cdot (T_{s,o}-T)[/tex]
Where:
[tex]m_{w}[/tex], [tex]m_{s}[/tex] - Masses of the water sample and the piece of steel, measured in kilograms.
[tex]c_{w}[/tex], [tex]c_{s}[/tex] - Specific heat of water and steel, measured in joules per kilogram-Celsius.
[tex]T_{w,o}[/tex], [tex]T_{s,o}[/tex] - Initial temperatures of the water sample and the piece of steel, measured in Celsius.
[tex]T[/tex] - Final temperature of the sample-piece system, measured in Celsius.
The final temperature is cleared:
[tex](m_{w}\cdot c_{w}+m_{s}\cdot c_{s})\cdot T = m_{w}\cdot c_{w}\cdot T_{w,o}+m_{s}\cdot c_{s}\cdot T_{s,o}[/tex]
[tex]T = \frac{m_{w}\cdot c_{w}\cdot T_{w,o}+m_{s}\cdot c_{s}\cdot T_{s,o}}{m_{w}\cdot c_{w}+m_{s}\cdot c_{s}}[/tex]
If we know that [tex]m_{w} = 1\,kg[/tex], [tex]m_{s} = 0.370\,kg[/tex], [tex]c_{w} = 4186\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]c_{s} = 460\,\frac{J}{kg\cdot ^{\circ}C}[/tex], [tex]T_{w,o} = 9\,^{\circ}C[/tex] and [tex]T_{s,o} = 210\,^{\circ}C[/tex], the final temperature of the system is:
[tex]T = \frac{(1\,kg)\cdot \left(4186\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (9\,^{\circ}C)+(0.370\,kg)\cdot \left(460\,\frac{J}{kg\cdot ^{\circ}C} \right)\cdot (210\,^{\circ}C)}{(1\,kg)\cdot \left(4186\,\frac{J}{kg\cdot ^{\circ}C} \right)+(0.370\,kg)\cdot \left(460\,\frac{J}{kg\cdot ^{\circ}C} \right)}[/tex]
[tex]T = 16.853\,^{\circ}C[/tex]
The final temperature of the water-steel system is 16.853 ºC.
how far can you travel in 7 hours if you are driving at a rate of 55 mph
the answer is 385 miles
Transpiration is the loss of water from the leaves of plants. The stomata of leaves must open to allow
carbon dioxide to enter the leaf for photosynthesis, but when they are open, water vapor escapes into
the atmosphere.
HYPOTHESIS: As the intensity of light is increased, the rate of transpiration will increase, as
measured in by the loss of mass of the plant.
Independent variable:
Dependent variable:
Answer:
Independent variable: The light intensity (what YOU CHANGE)
Dependent variable: The rate of transpiration (what YOU MEASURE)
Independent variable are the light intensity that what we change and dependent variable are the rate of transpiration that what we measure.
What is photosynthesis ?Photosynthesis is the process that can be used by the plants and other animals to covert light energy into the chemical energy. Photosynthesis is the main source of food in the earth.
Photosynthesis is the process in which oxygen is released. For survival oxygen is very important, from this process we obtain sufficient amount of oxygen.
The dependent variable is the rate of transpiration and the independent variable is time.The dependent variable is the rate of transportation because it is depends on the environmental factor the plant is placed.
Thus,Independent variable are the light intensity that what we change and dependent variable are the rate of transpiration that what we measure.
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A piece of brass is found to have a mass of 24.32 g. When placed in a graduated cyclinder with an initial reading of 5.60 mL the water level rises to 13.50 mL. What is the density of the piece of brass? Record your answer using sig figs and the correct unit. (Example: 2.3 g/mL)
Answer:
[tex]\rho=3.1g/mL[/tex]
Explanation:
Hello,
In this case, considering that the density of a body is computed given its mass and volume:
[tex]\rho =\frac{m}{V}[/tex]
Taking into account that the mass is 24.32 g and the volume is computed via the difference between the volume of the water with the brass and the volume of water by itself as follows:
[tex]V=13.50mL-5.60mL=7.9mL[/tex]
The density of the piece of brass turns out:
[tex]\rho =\frac{24.32g}{7.9mL}\\\\\rho=3.1g/mL[/tex]
Best regards.
The mass of the whole watermelon is 300g.
What is the mass of all 6 watermelon slices?
The solubility of oxygen in water
A) isn't significantly dependent on temperature.
B) is greater in cool liquid water than in warm liquid water.
O C) is responsible for thermoclines.
D) allows for a greater concentration of O2 in water than in air.
Answer:
B) is greater in cool liquid water than in warm liquid water.
Explanation:
The solubility of oxygen in water is more in cold water in comparison to warm water.
The solubility of oxygen in water depends on the temperature as in warm water, more oxygen is released while in cold water, less oxygen is released and more oxygen get dissolved.
Hence, the correct option is "B".
Answer: is greater in cool liquid water than in warm liquid water.
Explanation:
he solubility increases with the increase in the partial pressure of oxygen at a constant temperature and concentration.
Which of the following questions can be answered by science? (2 points) What makes a song sound beautiful? What is the meaning of life? What makes a painting beautiful? What are the effects of low pH in soil?
Answer: The answer is "What are the effect of low pH in soil"
Explanation: This is because this can be tested and because it is not a opinion or a moral value. Thus this question can be tested with the scientific method.
The question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.
What is Science?Science may be defined as a branch of scientific study that involves the application of knowledge and understanding of the natural and social world following a systematic methodology based on evidence.
It can broadly be classified into three categories such as Physics, Chemistry, and biology. Each sub-classification illustrates its own field of detailed study.
Science always deals with the concept of nature as well as natural phenomena. So, among the given options, the soil is an abiotic component of nature.
The effects of low pH in the soil depend on various factors like the complexity of organisms living on a particular area, resources, pollution level, etc.
Therefore, the question that can be answered by science is "What are the effects of low pH in soil". Thus, the correct option for this question is D.
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How many moles of hydrogen atoms are present in a 25.2 g sample of propane, C3H8?
Answer:
Explanation:
mass of the hydrogen atom in C3H8= 4.58 gram
C3H8 8H
25.2 gram x
(3x12)+ 8 8x1
x = 4.58 grams of H
# moles of hydrogen = mass/m.wt
= 4.58/8= 0.57 mole of hydrogen atom
Assume that each large number is a centimeter. How long is this pencil? Only part of the pencil is shown. Pick the best estimate.
A) 8.25 cm
B) 8.3 cm
C) 83 cm
D) 8.0 cm
From the figure we can notice that the tip is ended surely before 9 cm .
Also , the tip crossed two cuts after 8 .
Therefore , it is greater than 8.2 .
Now , if we see that the tip end between 2 and 3 .
Therefore , the best estimate is 8.25 cm .
Hence , this is the required solution .
A 150-lb patient is prescribed acetaminophen at 7.34 mg/kg. If acetaminophen is available on hand as a 0.125 mg/ml syrup, how many mililiters will the nurse administer?
Answer:
The nurse should administer 3995.2 millilitres of syrup.
Explanation:
The conversion factor of pound weight to kilogram is; 1 lb = 0.453592 kg
The body weight of the patient in Kg = 150 * 0.453592 = 68.04 kg
A prescription of 7.34 mg/kg acetaminophen means that he should receive;
7.34 mg * 68.04 = 499.4 mg of acetaminophen
Amount in grams of acetaminophen per millilitre of syrup = 0.125 mg
Number of millilitres of syrup required = 499.4 mg / 0.125 mg/mL = 3995.2 mL
Therefore, the nurse should administer 3995.2 millilitres of syrup.
Identify the control group the experimental group the independent variable and the dependent variable
A company wants to test a new dog food that’s aid supposed to help overweight dogs lose weight. 50 dogs are chosen to get the new food and 50 more continue their normal diets after one month the dogs are checked to see if they lose any weight
It took 73.2 J of heat to raise the temperature of 10.0g of a substance 8.58°C. What is the
specific heat of the substance?
Answer:
[tex] \boxed{\sf Specific \ heat \ of \ the \ substance \ (c) = 0.85 \: J/g \degree C } [/tex]
Given:
Mass (m) = 10.0 g
Rise in temperature (∆T) = 8.58°C
Energy required (Q) = 73.2 J
To Find:
Specific heat of the substance (c)
Explanation:
Specific heat (c) of a substance is the energy required to raise the temperature of one gram of the substance by one degree Celsius.
Formula of specific heat is given as:
[tex] \boxed{ \bold{c = \frac{Q}{m\Delta T}}}[/tex]
By substituting value of Q, m & ∆T in the formula we get:
[tex] \sf \implies c = \frac{73.2}{10 \times 8.58} \\ \\ \sf \implies c = \frac{73.2}{85.8} \\ \\ \sf \implies c = 0.85 \: J/g \degree C [/tex]
The nucleus has almost _____ the mass of the atom. It is made up of protons (+) and neutrons (0)
Answer:
1/100,000
Explanation:
its radius is only about 1/100,000 of the total radius of the atom. if an atom were the size of a football stadium, the nucleus would be about the size of a pea! Electrons have virtually no mass, but protons and neutrons have a lot of mass for their size. As a result, the nucleus has virtually all the mass of an atom.
. Monthly measurements of atmospheric CO2 concentration at Mauna Loa began in March 1958. The average CO2 concentration for that month was 315.71 ppm. In 2020, the March monthly average value was 414.51 ppm. Calculate the total increase in March concentration (in ppm) from 1958-2020 (62 years). Also calculate the average increase per year.
Answer:
[tex]Increase=98.8ppm[/tex]
[tex]Average\ increase/year=1.594\frac{ppm}{year}[/tex]
Explanation:
Hello,
In this case, since the nowadays concentration of CO2 is 414.51 ppm and the concentration in 1958 was 315.71 ppm, the total increase is computed via the difference between them:
[tex]Increase=414.51ppm-315.71ppm\\\\Increase=98.8ppm[/tex]
Moreover, the average increase per year is computed considering that from 1958 to 2020, 62 years have passed, therefore, such average is:
[tex]Average\ increase/year=\frac{98.8ppm}{62 years} \\\\Average\ increase/year=1.594\frac{ppm}{year}[/tex]
Regards.
A. The total increase in March concentration (in ppm) from 1958 to 2020 is 98.8 ppm
B. The average increase per year is 1.59 ppm / year
A. How to determine the increase Concentration in March 1958 = 315.71 ppmConcentration in March 2020 = 414.51 ppmIncrease =?Increase = (Concentration in March 2020) – (Concentration in March 1958)
Increase = 414.51 – 315.71
Increase = 98.8 ppm
B. How to determine increase per year Increase = 98.8 ppmTotal year = 2020 – 1958 = 62Increase per year =?Increase per year = Increase / Total year
Increase per year = 98.8 / 62
Increase per year = 1.59 ppm / year
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How many moles are there in 2.59x1024 molecules CO2?
Answer:
2.59
x
1024
=
C
O
2
=
Explanation:
