Answer:
In a conventional optical microscope, objects less than about 200 nanometers apart cannot be distinguished from one another. ... Although electron microscopes produce a detailed image of very small structures, they cannot provide an image of the proteins that make up those structures.
Answer:
b. transmission electron microscope
Explanation:
Lead has a density of 11.3 g/mL. If you have 105 grams of lead,
what is the volume in milliliters?
Remember to select an answer with the correct number of
significant figures.
Answer:
Volume = 9.29 mLExplanation:
Density of a substance can be found by using the formula
[tex]Density( \rho) = \frac{mass}{volume} [/tex]
From the question
Density = 11.3 g/mL
mass = 105 g
Substitute the values into the above formula and solve for the volume
That's
[tex]11.3 = \frac{105}{v} [/tex]
Cross multiply
11.3v = 105
Divide both sides by 11.3
[tex]v = \frac{105}{11.3} [/tex]
v = 9.29203
We have the final answer as
Volume = 9.29 mLHope this helps you
If a neutral copper atom becomes an ion that has a charge of 2+, how many electrons does the resulting ion have?
a31
b27
c29
d28
The resulting copper ion has 27 electrons.
Copper ions:The Copper atom has an atomic number 29.
This means that the neutral Copper atom has 29 electrons and 29 protons.
Now, the copper ion with 2+ charge means that the copper ion has an extra positive charge. This extra positive charge is due to the loss of electrons.
When the copper atom loses electrons, the number of electrons in the atom is less than the number of protons, therefore, the charges are not balanced.
For a copper ion with 2+ charge, the neutral copper atom must has lost 2 electrons.
So, now the copper has 29 - 2 = 27 electrons.
The resulting ion has 27 electrons and 29 protons.
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Why does every sample of water have the same boiling point?
Answer:
beacuse water is same every where because it is the combination of h2 +o2 h2o which doesn't change while it is different
Explanation:
ok
what is chemical safety?
cyclohexene from aminobenzene conversion
Answer:
By dehydrogenation of cyclohexane you may get Benzene as a product. We may use noble metals(Au, Ag, Pt etc.) to dehydration of cyclohexane. Consider following reaction which gives an idea about reaction.
Explanation:
I think it is the correct answer
i have read this in one of the book
To find the density of an irregular object, what method should be used?
Answer:
You can find the volume of an irregular object by immersing it in water in a beaker or other container with volume markings, and by seeing how much the level goes up. You can use this relation backwards too -- if you know what material an object is made of, you can look up its density in a book. hOPE THIS HELPS! =)
A neutral atom has an equal number of positive and negative charges. If a neutral fluorine atom has 9 protons and 10 neutrons, how many electrons will it have?
The number of electrons should be 9.
Given that,
If a neutral fluorine atom has 9 protons and 10 neutronsCalculation of a number of electrons:
= Number of protons = Number of electrons
9 = Number of electrons
Therefore,
Number of electrons = 9
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Mercury has a density of
13.55 g/mL .What would be the volume of a 122 g sample?
Answer:
V = 9.0037
Explanation:
V = M/D
V = 122/13.55
V = 9.0037
Q3: What fundamental unit of the metric system always has a prefix in front of Write your answer here
Answer:
prefix kilo
Explanation:
Hope this helps.......
During what part of the experiment is the hypothesis "judged" as being rejected or supported?
Answer:
null
Explanation:
the hypothesis is a typical statistical theory which suggest that no statistical relationship and significance exists in a set of a given single observed variable between two sets of the observed data and measured phenomena
What is the solution to the problem rounded to the correct number of significant figures?
12.77 + 0.8 = ?
Answer:
13.57 approximately 14
Convert 732.0 mmHg to atm
Answer:
The answer is
0.95 atmExplanation:
To solve the question we use the following conversion
That's
1 mmHg [tex]\cong[/tex] 0.0013 atm
So we have
If 1 mmHg [tex]\cong[/tex] 0.0013 atm
Then 732 mmHg will be
732 × 0.0013 atm
We have the final answer as
0.95 atmHope this helps you
Catalase is an enzyme that speeds up the breakdown of hydrogen peroxide in cells. During this reaction oxygen is given off. A scientist designs an experiment to determine how much oxygen is given off when varying concentrations of catalase are used. Identify the independent variable A the concentration of the catalase B the result of the reaction C Type of proxide D the shape of the container
Answer:
The correct option is A
Explanation:
An independent variable is a variable that is intentionally altered (directly or indirectly) and is not dependent on another variable in the course of an experiment. Unlike the independent variable, the dependent variable depends or is presumed to depend on the altered independent variables.
From the explanation above, it can be deduced that the concentration of the catalase is the independent variable as it was intentionally altered (by using different concentrations) in the course of the experiment. The amount of oxygen given off is the dependent variable here
Which two characteristics affect ocean water’s temperature?
salinity and waves?
location and depth?
mass and salinity ?
waves and location??
Answer:
The correct answer is location and depth
Explanation:
Correct on edge 2020
Answer:
B.) Location and Depth
1) Two clear solutions are placed in separate beakers. The first solution has a pH = 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting solution has a pH = 7, describe the second solution.
Answer:
pH = 10
Explanation:
pH = -log [H⁺]
A solution that is pH = 4 has a [H⁺] = 1x10⁻⁴M
As the mixture of the two solutions is pH = 7 (Neutral). The second solution must contain the exact amount of OH⁻ to neutralize the H⁺ of the first solution. That is [OH⁻] 1x10⁻⁴
And as pOH = -log [OH⁻]
pOH = -log 1x10⁻⁴
pOH = 4
Also, pH = 14-pOH
pH of the second solution must be:
14 - 4
pH = 10Which contributes to the lack of evidence of the Period of Heavy
Bombardment on Earth?
The correct answer to this would be:
Earth’s volcanoes
Together with weathering and plate tectonic movements, Earth’s volcanic eruptions and emission of lava has destroyed/covered many of the craters which were created on Earth during the Period of Heavy Bombardment.
IamSugarBee
The correct answer to this would be letter:
A. Earth’s volcanoes
Together with weathering and plate tectonic movements, Earth’s volcanic eruptions and emission of lava has destroyed/covered many of the craters which were created on Earth during the Period of Heavy Bombardment.
which product of petroleum is normally used as fuel in cars and light vehicles
Answer:
mostly gasoline in cars nowadays
Which of the following combustion reactions is balanced correctly?
O A. C5H12 + 402 → 5C02 + 3H20
O B. C5H12 + 402 → CO2 + 6H20
O C. C5H12 + 802 → 5002 + 6H20
O D. C5H12 + 5.502 → 5CO2 + H20
Answer:
c
Explanation:
The chemical equation which is balanced is C₅H₁₂+ 8 O₂ [tex]\rightarrow[/tex] 5 CO₂ + 6 H₂O which is a combustion reaction.
What is chemical equation?
Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.
A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .
The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.
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Life has existed on Earth for about 3.8 billion years despite gradual and sudden environmental changes. How do the scientific factors of sustainability help explain how life has continued to survive and evolve?
Answer:
As we all are aware that life on Earth is existed due to several environmental changes and there are several scientific factors of sustainability that support the survival and evolution of life on Earth.
Scientific factors of sustainability include solar energy, chemical cycle, and biodiversity that supported life on Earth. solar energy helps all organism and especially producers to gain energy and store the energy which further used in chemical cycles of transferring energy to other trophic levels.
Chemical cycle also involves the interaction of biotic and abiotic envrionment with each other that leads to environmental changes as well as organisms adapt themselves accordingly.
Biodiversity maintains the balance in the ecosystem and prevent dominancy of one organism otherwise it can lead to scarcity and organism would not be able to survive. Variation in biodiversity due to random mating in the same species leads to evolution and produces new species of organisms.
Hence, scientific factors of sustainability play major role in survival and evolution of life on the Earth.
what is the symbol of mercury
Answer: Hg
Explanation:
The symbol of Mercury is Hg drived from Hydra gayrum
The periodic table _____. is arranged by atomic mass is arranged by number of protons was developed by early alchemists is divided into vertical periods and horizontal groups
Is the range by number of protons sorry if I'm wrong
Answer:
Is the range by number of protons sorry if I'm wrong
Explanation:
The density of gold is 19.3 g/cm3 and the density of lead is 11.4 g/cm3. If you have 5 grams of gold and 5 grams of lead, which will have the greater volume?
Given :
The density of gold is [tex]19.3 \ g/cm^3[/tex] and the density of lead is [tex]11.4\ g/cm^3[/tex] respectively .
To Find :
Which have greater volume .
Solution :
We know , density is given by :
[tex]\rho=\dfrac{mass}{volume}[/tex]
Now , volume of 5 gm gold .
[tex]Volume=\dfrac{mass}{\rho}\\\\Volume =\dfrac{5}{19.3}\ cm^3\\\\Volume =0.26\ cm^3[/tex]
Also , volume of 5 gm lead .
[tex]Volume=\dfrac{mass}{\rho}\\\\Volume =\dfrac{5}{11.4}\ cm^3\\\\Volume =0.44\ cm^3[/tex]
Therefore , volume of lead will be greater than gold.
Hence , this is the required solution .
Explain the similiarities and differences between combustion and food digestion?
Answer:
Digestion is not an example of combustion. Digestion is an endothermic process where energy is utilized to break down the complex food molecules into simple forms. In a combustion reaction carbon dioxide,water,energy and some by products are released.
Explanation:
Do you think it is possible to be an environmentalist without also being an environmental activist? Why or why not?
Solve the following, observing significant figure
rules
1 355.24 g -
0.954 g
Answer:
355.24 - 0.954 = 354.29
Sig Figs = 5
Decimals = 2
Scientific Notation ;
[tex]3.5429 \times 10^2[/tex]
Explanation:
Which state of matter can change both shape and volume?
O solid
O liquid
O gas
Answer:
Gas
Explanation:
Gasses will fill the shape whatever container they are in and can be compressed down into smaller volumes quite easily.
Solids have a definite shape and volume
liquids have an indefinite shape but a definite volume
what evidence is there that all state of matter have mass
Answer:
Matter is the "stuff" that makes up the universe everything that takes up space and has mass is matter.
All matter is made up of atoms, which are in turn made up of protons, neutrons and electrons
Matter itself must have mass irrespective of its state.
Matter is anything that has mass and occupy space. Matter exists in three states;
Solid Liquid GasIn all these states of matter, matter is made up of "stuff". For instance, if a solid, liquid or gas is introduced into an empty bag attached to a scale, the bag will move downwards and the scale will record an increase in mass.
This shows that matter in solid, liquid or gaseous state all have mass.
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What is the mass of the object?
Answer:
37.3
263.5
Explanation:
The scale measures hundreds of units, tens of units, units, and parts of units (1 decimal place.
Scale 1
Hundreds 0 * 100 = 0
Tens: 3 * 10 = 30
Units: 7 * 1 = 7
1/10 unit = 3* 0.1 = 0.3
Total 30 + 7 + 0.3 = 37.3
Scale 2
Hundreds 2 * 100 = 200
Tens: 6 * 10 = 60
Units: 3 * 1 = 3
1/10 unit = 5* 0.1 = 0.5
Total = 200 + 60 + 3 + 0.5 = 263.5
What is the mass of a 12.31 cubic centimeter piece of copper having a density of 8.96 grams/ cubic centimeter?
m ≈ 110.30 grams
Explanation:d = m/V
m = d×V
m = 8.96g/cm³×12.31cm³
m = 110.2976
m ≈ 110.30 grams
Answer:
[tex]\Huge \boxed{\mathrm{110.2976 \ grams}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf \displaystyle density = \frac{mass}{volume}[/tex]
[tex]\displaystyle \rho = \frac{m}{V}[/tex]
Solving for the mass.
[tex]m = \rho \cdot V[/tex]
The density of the copper piece is 8.96 g/cm³.
The volume of the copper piece is 12.31 cm³.
[tex]m = 8.96 \cdot 12.31[/tex]
[tex]m= 110.2976[/tex]
The mass of the copper piece is 110.2976 grams.
[tex]\rule[225]{225}{2}[/tex]
what do elements in block have in common?
Answer:
The d-block elements are all metals and most have one or more chemically active d-orbital electrons. Because there is a relatively small difference in the energy of the different d-orbital electrons, the number of electrons participating in chemical bonding can vary.
Answer:
the d block element are all metals and most have one ore more chemically active d-orbital electrons.because there is a realatively small differernce in the energy of the different d-orbital electrons ,the number ofelectrons participating in chemical bonding can vary.