Answer:
A scientific method is the one which is independent of the person taking the measurements. Hence, a method which includes a scientific instrument/experiment, systematic observation, measurement, testing etc and is independent of personal feelings or opinions is known as a scientific method.
The measurement of temperature, testing of the material of surface, and moisture content in the atmosphere are testable questions and part of scientific method to find the reasons of different shapes of dewdrops. whether the different shapes are formed due to change in temperature, surface or moisture content in the atmosphere or not? The result of this measurement would not depend on the scientist doing the experiment. Scientific instruments would be used which would give the same reading. But the result of the observation of most unusual shape and pleasing shape of drop is purely dependent on one observer. It cannot be generalized reason
Explanation:
Answer:
brainliest pls pls pls
Explanation:
Suppose you used 0.5 M NaOH to titrate your vinegar sample instead of 0.1 M. What effect does the concentration of base added have on the reliability of the results of your titration?
Answer: the reliability will be worse
Explanation:
Suppose we used 0.5 M NaOH to titrate our vinegar sample instead of 0.1 M.
Now by using 0.5M instead of 0.1M we are increasing the concentration of NaOH,
We know that the moles used = Volume x concnetration.
so for the same no of moles, if the concentration increases, the volume decreases.
Hence it will consume less NaOH.
now Since the volume decreases, the titration volume of less number will increase the % error.
Therefore the reliability will be worse.
The effect that the concentration of the added base has on the reliability of the results of the titration in question is; The reliability will be worse.
We are told that;
0.5 M NaOH is to be used to titrate a vinegar sample instead of 0.1 M.
Now, 0.5 M means a concentration of 0.5 and since it is higher than 0.1M, it means the concentration of NaOH will increase.
Formula for number of moles used is;
n = V × M
Where;
n is number of moles
V is volume
M is concentration
We can see that number of moles is directly proportional to the volume and concentration.
Thus, if the number of moles remains unchanged, as we have increased the concentration, it means that the volume will decrease.
Thus, lesser volume of NaOH will be used and as a result of this decrease in volume, there will be a greater possibility of error.
In conclusion, we can say that the reliability will be worse.
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Humans have 50 pairs of chromosomes true or false
Answer:
False
Explanation:
humans have 23 pairs
A copper wire is left outside on the ground for several weeks. Which
statement describes a change resulting from the chemical properties of the
wire?
A. It conducts electricity when lightning strikes it.
B. It melts when heated.
C. It becomes tarnished.
D. It bends when someone steps on it.
Answer:
c
Explanation:
the oxygen in the air and water from the rain caused oxidation causing the copper wire to become tarnished.
The statement that describes a change resulting from the chemical properties of the wire is it becomes tarnished. The correct option is C.
What are chemical properties?Chemical properties are those properties that are not always shown physically, but they came out of a chemical reaction. Chemical properties are pH, solubility, toxicity, the heat of combustion, flammability, reactivity, etc.
The copper wire, when left out in the environment, becomes tarnished, due to the air and moisture present in the environment. The meaning of tarnished means it loses its luster or its quality.
Copper is a shiny, soft, and brown-colored metal. It is usually used in making wire used for electricity.
Thus, the correct option is C. It becomes tarnished.
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What type of heat transfer occurs when you touch a metal
seat with your hand and the seat feels cold?
Answer:
heat conduction
Explanation:
Conduction :]
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.
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.
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Which characteristic of a strong acid
Answer:
Strong acid breaks up into ions
Explanation:
A compound of a transition metal and iodine is 56.7% metal by mass.How many grams of the metal can be obtained from 630 g of this compound?
Answer:
357 g of the transition metal are present in 630 grams of the compound of the transition metal and iodine
Explanation:
In any sample of the compound, the percentage by mass of the transition metal is 56.7%. This means that for a 100 g sample of the compound, 56.7 g is the metal while the remaining mass, 43.3 g is iodine.
Given mass of sample compound = 630 g
Calculating the mass of iodine present involves multiplying the percentage by mass composition of the metal by the mass of the given sample;
56.7 % = 56.7/100 = 0.567
Mass of transition metal = 0.567 * 630 = 357.21 g
Therefore, the mass of the transition metal present in 630 g of the compound is approximately 357 g
The concentration of carbon dioxide in the atmosphere has been increasing for many years. How might this increase affect photosynthesis? (15 points if answered)
Answer:
Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.
Which sentence best describes a bond formed between two unlike atoms?
O A. The bond could form only between two atoms of very different
electronegativities.
O B. The electrons involved in the bond are shared equally between the
atoms.
O C. The bond could have been formed only as the result of ions
attracting each other.
D. The type of bond is determined by the difference in
electronegativity of the atoms.
The type of bond is determined by the difference in electronegativity of the atoms. Hence, option D is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
The ability of an atom to attract a pair of electrons in a chemical bond is called its electronegativity. The difference in electronegativity between two atoms determines how polar a bond will be.
Hence, option D is correct.
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Which graph shows the pressure-volume relationship expected for an ideal gas? (This is an illustration of Boyle's law.)
Question 11 options:
A)
Graph B
B)
Graph C
C)
Graph D
D)
Graph A
Answer:
D
Explanation:
The graph of Boyle's law is known as pressure-volume graph or PV curve. It is as follows:
As observed from the graph above, pressure increases with a decrease in volume, and vice versa. Thus, pressure is inversely proportional to volume. Other parameters (temperature and amount of gas) are constant in the graph above.
Volume is on the x-axis and pressure, on the y-axis. The equation of the curve is PV = k, which is the equation of Boyle's law. The curve is hyperbolic in nature having two asymptotes: P = 0 (horizontal) and V = 0 (vertical).
As volume tends to positive infinity, pressure tends to zero, and we get the horizontal asymptote, P = 0.
Horizontal asymptote, P=0
When volume approaches zero, pressure approaches infinity, and it results in the vertical asymptote, V = 0.
The graph which shows the pressure-volume relationship expected for an ideal gas is: C) Graph D.
Boyle's states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.
Mathematically, Boyle's law is given by the formula:
[tex]PV = k[/tex]
Where;
P is the pressure of an ideal gas.V is the volume of an ideal gas.For the illustration of Boyle's law using a graph, volume is represented on the x-axis while pressure is represented on the y-axis.
Generally, the graph of Boyle's law is a hyperbolic curve with two asymptotes:
P = 0 (horizontal axis).V = 0 (vertical axis).Find more information: https://brainly.com/question/1437490
All of the following are principles of the cell theory EXCEPT
O A) the cell is the smallest unit of life
O B) water is the main ingredient in every cell
O C) All new cells come from pre-existing cells
OD) all living things are made of one or more cells
Which of the following statements is true?
Question 10 options:
a chromosome is larger than a cell
a DNA strand is made of many chromosomes
a gene contains may chromosomes
a chromosome contains many genes
Answer:
a chromosome contains many genes
Explanation:
What information does a solubility table give?
A. It tells which compounds react with oxygen.
B. It tells which reactants are in the gaseous state.
O C. It tells which metals will replace other metals.
D. It tells which compounds will dissolve in water.
Answer:
Option D - It tells which compounds will dissolve in water.
Explanation:
It is used to predict whether or not a given ionic compound is soluble.
Answer:
d
Explanation:
A candle made of certain wax blend burns at a rate of 44.2 mg/min. What is the value of this burn rate if expressed in grams/hour
Answer:
2.652 g/h.
Explanation:
Burn rate (in mg/min) = 44.2 mg/min
Burn rate (in m/h) =?
We'll begin by converting 44.2 mg/min to g/min. This can be obtained as follow:
1 mg/min = 0.001 g/min
Therefore,
44.2 mg/min = 44.2 mg/min × 0.001 g/min / 1 mg/min
44.2 mg/min = 0.0442 g/min
Finally, we shall convert 0.0442 g/min to g/h. This can be obtained as follow:
1 g/min = 60 g/h
Therefore,
0.0442 g/min = 0.0442 g/min × 60 g/h / 1 g/min
0.0442 g/min = 2.652 g/h
Therefore, 44.2 mg/min is equivalent to 2.652 g/h.
Thus, the burn rate (in m/h) is 2.652 g/h.
How many moles are in the 100,000g of CuSO4 • 5H2O ?
Answer:
try (107.87 amu)
Explanation:
Transverse waves move the medium perpendicular
true or false
Answer:
True
Explanation:
Guys I need help with this ASAP! An atom of Iron has a mass of 56 atomic mass units. What is the number of protons and the number of neutrons in the nucleus?
Answer:
protons = 26; neutrons = 30
Explanation:
protons = atomic number; neutrons = atomic mass – # of protons.
8)
C(diamond) → C(graphite)
delta G° = -2.9 kJ/molrxn
Which of the following best explains why the reaction represented above is not observed to occur at
room temperature?
(A) The rate of the reaction is extremely slow because of the relatively small value of AGº for
the reaction.
(B) The entropy of the system decreases because the carbon atoms in graphite are less ordered
than those in diamond.
(C) The reaction has an extremely large activation energy due to strong three-dimensional
bonding among carbon atoms in diamond.
(D) The reaction does not occur because it is not thermodynamically favorable.
Answer: its b hope this helps.
Explanation:
These allow electricity to flow easily through them (think copper and aluminum).
(Lessons 5.01-5.03)
Insulators
Electric Currents
Conductors
Resistors
Answer:
conductors
Explanation:
Occurs when the membrane surrounds a large substance and engulfs it.
) Active Transport
O Diffusion
O Endocytosis
Exocytosis
Does this sound catchy or invite you to read more? "GMOs and pesticides are general amongst farmers for generations and should not be that common." If not please help me.
Answer:
It sounds fine, but it may be a bit too long. It's difficult to shorten things like this, but getting more straight to the point would give it that "catchy" feel.
Explanation:
Carbon has 6 dots around the symbol in the correct lewis structure
True
False
Answer:
It has 4
Explanation:
the carbon Lewis dot struc has 4 around it it looks like this
. .
C
. .
Which of the following best represents the levels of organization of the root system from most complex to least complex? *
1 point
root system → cell → root
root system → root → cell
cell → root system → root
root → cell → root system
Answer:
b
Explanation:
THis is true because the root system is last ,then root,and cell
HOPe this helps:)
pls mark brainly
c. What might have happened in Kush and Egypt if Kush had developed iron
weapons?
Answer:
Kush would have been able to fight better and probably would have never been invaded by Egypt, and they could have beaten the Assyrians when they tried to takeover Egypt. And the 25th dynasty would have continued.
Explanation:
that is my explanation and answer^
In like manner, represent particle diagrams that account for the fact that one volume of hydrogen combines with one volume of chlorine to form hydrogen chloride. What do you suppose is the formula of hydrogen chloride?
Answer:
According to Avogadro's law which states that equal volumes of all gases under the same condition of temperature and pressure contain equal number of molecules. Therefore, one molecule of hydrogen reacts with one molecule of chlorine to yield two molecules of hydrogen chloride.
The formula of hydrogen chloride is HCl
The particle diagram is found in the attachment below.
Explanation:
The reaction between hydrogen and chlorine to form hydrogen chloride is represented by the equation below
H₂(g) + Cl₂(g) ---> 2HCl(g)
In the reaction equation above, one mole (or one volume) of diatomic hydrogen gas reacts with one mole (or one volume) of diatomic chlorine gas to form two moles (or two volumes) of hydrogen chloride gas. This is in accordance with Avogadro's law which states that equal volumes of all gases under the same condition of temperature and pressure contain equal number of molecules.
What is the wavelength of a 3 x 1012 Hz infrared wave?
Answer:
[tex]\lambda=10^{-4}\ m[/tex]
Explanation:
Given that, [tex]\lambda=10^{-4}\ m[/tex]
The frequency of infrared wave, [tex]f=3\times 10^{12}\ Hz[/tex]
We need to find the wavelength of infrared wave. The relation between the frequency and the wavelength is given by :
[tex]c=f\lambda[/tex]
where
c is the speed of light
[tex]\lambda=\dfrac{c}{f}\\\\\lambda=\dfrac{3\times 10^8}{3\times 10^{12}}\\\\=0.0001\ m\\\\=10^{-4}\ m[/tex]
So, the wavelength of the infrared wave is [tex]10^{-4}\ m[/tex].
Markus was doing his chemistry homework and needed to find the
number of electrons in an atom of carbon. He looked at his periodic table
and saw that it had an atomic mass of 12 and the atomic number was 6.
What should his answer be?
Answer:
1869, the Russian chemist Dmitri Mendeleev came to prominence with his tabular ... He found that few of the new developments in the field of chemistry had made ... He corrected the known atomic masses of some elements and he used the ... Atomic number 101, Mendelevium, is named after the periodic table's architect
Explanation:
1869, the Russian chemist Dmitri Mendeleev came to prominence with his tabular ... He found that few of the new developments in the field of chemistry had made ... He corrected the known atomic masses of some elements and he used the ... Atomic number 101, Mendelevium, is named after the periodic table's architect
Polonium-214 went through a series of radioactive decays to produce a stable isotope of bismuth-210 choose the correct decay series that would produce bismuth-210
A: Polonium-214 undergoes 2 beta decay and 1 gamma emission
B: Polonium-214 undergoes 1 alpha decay and 2 gamma emission
C: Polonium-214 undergoes 2 alpha decay and 1 beta decay
D: Polonium-214 undergoes 1 alpha decay 1 beta decay and 1 gamma emission.
The correct decay series :
₈₄Po²¹⁴⇒₈₃Bi²¹⁰+₂He⁴+ ₋₁e⁰+ ₀γ⁰
Further explanationRadioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
alpha α particles ₂He⁴ beta β ₋₁e⁰ particles gamma particles ₀γ⁰ positron particles ₁e⁰ neutron ₀n¹Decay's reaction :
₈₄Po²¹⁴⇒₈₃Bi²¹⁰+x+y+z
From this decay reaction can be concluded
mass number decreased by 4
atomic number decreased by 1
Then the most suitable are:
Polonium-214 undergoes 1 alpha decay 1 beta decay and 1 gamma emission.
₈₄Po²¹⁴⇒₈₃Bi²¹⁰+₂He⁴+ ₋₁e⁰+ ₀γ⁰
So that the mass number and atomic number are the same both before and after decay
What do you have to do to break a molecule?
Answer:
Heat the molecule
Explanation:
Since most bonds require energy to form, they also give off energy when they are broken. But before most bonds break, the molecule has to be heated. Then the atoms start to move, and when they move too much, the bond breaks. Molecules that require less energy to break than they give off when broken are called fuels.
All solutions
are mixtures; but
all mixtures are
not solutions.
why?
All solutions are mixtures of two or more substances, but unless the mixture has a homogeneous distribution of solutes in the solvent, then the mixture is not a solution. Therefore, all mixtures are not solutions.
In the life cycle, growth happens after:birth death decay reproduction
Answer:
Birth
Explanation:
Once your out of the wound you develop into a kid to a toddler, then a teen and so on
