Answer:
I think its vaccines
Which of the following is the best thermal insulator to reduce the transfer of
thermal energy by radiation?
O A. Air
OB. Glass
O C. Wood
OD. A vacuum
Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Hence, Option (D) will be the correct option
What is Heat radiation ?Heat Radiation refers to the transfer of heat from a hot body to cold body directly, without heating the medium between two bodies.
Vaccum does not have any particles in it. Thus, there will be no transfer of heat through it.
The best example of it is thermous flask in which vaccuum inside thermous flask reduces the transfer of energy through it.
Hence,Among the given mediums, Vaccuum is the best thermal insulator to reduce the transfer of thermal energy by radiation as there will be no air particles which carries heat from one place to other. Thus, Option (D) will be the correct option
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What kind of exercise does not require the use of oxygen to metabolize energy? strength aerobic stretching anaerobic
Answer:
See Below
Explanation:
'an aerobic ' means it does not use oxygen
Answer:
anaerobic
Explanation:
what is carbon cycle
Will sodium iodide react with bromine to produce sodium bromide and iodine? Why or why not?
Question 10 options:
A) Yes, because bromine has lower activity than iodine
B) No, because bromine has higher activity than iodine
C) No, because bromine has lower activity than iodine
D) Yes, because bromine has higher activity than iodine
I believe its either B or D
Answer:
C
Explanation:
The higher the period the higher the activity of an element, therefore, since iodine is in period 6 and bromine is in period 5, the described reaction is not possible due to the fact that bromine is less active
Which two protests evolved from symbolic relationships of organism which resulted in eukaryotic organisms chloroplast
Red algae and euglena evolved from a symbiotic relationship of organisms, which resulted in eukaryotic organisms containing chloroplasts
Theory of endosymbiosis:
Early eukaryotes developed by the symbiotic connection of prokaryotes, in accordance with the endosymbiosis idea. Which two protists underwent symbiotic evolution, leading to the development of eukaryotic creatures with chloroplasts.
-Symbiotic relationships between two or more prokaryotic cells led to the evolution of the first eukaryotic cells. Greater prokaryotic cells invaded or devoured smaller prokaryotic cells. The connection provided a secure home and nourishment for the tiny cells. By absorbing part of the organic molecules or energy generated by the endosymbionts, the bigger cells (now referred to as hosts) profited.
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Which group of the periodic table consists of elements that share similar
properties and have 2 electrons in their outer shells?
A. 1
B. 14
C. 13
D. 2
The alkaline earth metals are also referred to as Group 2A. elements are comparable to one another in terms of their electron configurations and thus, their properties.
Alkaline-earth metals:From beryllium (Be) through radium, the alkaline-earth metals comprise Group 2 of the periodic table (Ra). The alkaline earth metals are so reactive because each of these elements has two electrons in its lowest energy level that they are rarely encountered alone in nature. However, they don't react as quickly as alkali metals do. Compared to the alkali metals, their chemical reactions normally proceed more slowly and generate less heat.
Elements and their electronic configuration are listed below:-Be :- [He]2S2
Mg:-[Ne]3S2
Ca :-[Ar]4S2
Sr:-[Kr]5S2
Ba:-[Xe]6S2
Ra:-[Rn]7S2
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Group 2A is another name for the alkaline earth metals, which are similar to one another in terms of their electron configurations and thus, their properties.
Alkaline Earth MetalsGroup 2 of the periodic table is made up of alkaline-earth metals, starting with beryllium (Be) and ending with radium (Ra). The fact that each of these elements possesses two electrons at its lowest energy level makes the alkaline earth metals extremely reactive, which is why they are rarely found by themselves in nature. They don't respond as quickly, though, as alkali metals do. Their chemical reactions often take longer and produce less heat than those of the alkali metals.
Following is a list of elements along with their electronic configuration:-Be:- [He]2S2
Mg:-[Ne]3S2
Ca:-[Ar]4S2
Sr:-[Kr]5S2
Ba:-[Xe]6S2
Ra:-[Rn]7S2
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how power station that produce electricity affect our environment what can we do to minimize these harmful effects?
Answer:
they help becuz they dont use any extra power and the are reneable
. You need to prepare 755ml of a 3.50M solution of sodium hydroxide solution. If
the original solution had a molarity of 20.0M how much should you take out to
make the diluted solution?
M₁V₁=M₂V₂
20 x V₁ = 3.5 x 755
V₁ = 132.125 ml
An aqueous solution of 4 mol/L nitric acid is electrolysis in an electrolytic cell using graphite electrodes.
Name the gas given off at the anode
The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
What is electrolysis?The term electrolysis has to do with the decomposition of a substance by the passage of a direct current through it.
The ions present in the system are[tex]H^+[/tex], [tex]OH^-[/tex] and [tex]NO_3^-[/tex] ions. The gas given off at the cathode is hydrogen while the gas given off at the anode is oxygen.
The half-reaction equation of the reduction is;
[tex]2H^+(aq) + e[/tex] → [tex]H_2(g)[/tex]
The oxidation half-reaction equation is;
[tex]4OH^- (aq)[/tex] → [tex]2H_2O(l) + 4e[/tex]
The overall equation is;
[tex]4H^+(aq) + 4OH^- (aq)[/tex] → [tex]4H_2(g) + 2H_2O(l) + 4e[/tex]
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What temperature is absolute zero?
OA. 0°C
OB. OK
O
C. 0°F
D. O molecules
Answer: 0 K
Explanation:
This is a fact - absolute zero is defined as 0 degrees Kelvin.
How many grams of nitrogen,
N2, would be required to react with
6.25 moles hydrogen, H2?
N₂ + 3H₂ → 2NH3
[?] g N₂
Answer: 29.2
Explanation:
From the coefficients of the equation, we know that for every 3 moles of hydrogen consumed, 1 mole of nitrogen is consumed.
This means we would need 6.25/3 = 2.0833333333333 mol of nitrogen.
Nitrogen has an atomic mass of 14.007 g/mol, so 2.0833333333333 moles of nitrogen have a mass of (14.007)(2.0833333333333) = 29.2 g (to 3 sf)
the mr-vp tests are part of a battery of tests called imvic tests. these tests are useful in identifying and differentiating:
the mr-vp tests are part of a battery of tests called imvic tests. these tests are useful in identifying and differentiating Gram-positive cocci.
What is mr-vp tests?mr-vp tests can be regarded as a test that is used in the determination of fermentation pathway that is required in glucose.
It is used in mixed acid fermentation pathway and can be used in identifying and differentiating Gram-positive cocci.
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What are distilled chemicals used for and what are the environmental impacts?
Answer:
Cryogenic distillation is the commercially viable separation; however, it consumes over 20 Gigajoules of energy for every ton of ethylene produced. This energy consumption is associated with significant greenhouse gas emission and depletion of non-renewable energy resources
Explanation:
hope it's helpful to you
What is the mass of 0.20 mole of glucose C6H12O6?
a. 230 g
b. 36 g
c. 23 g
d. 4.6 g
Answer:
answer will be b
Explanation:
mole is given 0.20
you have to find mass so just convert it into mass
remember if you move away from mole you multiply and if you move towards mole you divide so
just multiply mole with molar mass of glucose
so
0.20×180 = 36 grams
simple keep learning.......
54.0 g Al reacts with 64.0 g O2 to
form Al2O3 according to the equation.
4A1+30₂ → 2Al2O3
Al: 26.98 g/mol Al2O3: 101.96 g/mol
How many grams of Al2O3 form
from 54.0 g Al?
[?] g Al₂O3
Answer:
102 g Al₂O₃
Explanation:
To find the mass of Al₂O₃, you need to (1) convert grams Al to moles Al (via molar mass), then (2) convert moles Al to moles Al₂O₃ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles Al₂O₃ to grams Al₂O₃ (via molar mass). It is important to arrange the ratios in a way that allows for the cancellation of units. The final answer should have 3 sig figs to reflect the given values.
Molar Mass (Al): 26.98 g/mol
Molar Mass (Al₂O₃): 101.96 g/mol
4 Al + 3 O₂ ---> 2 Al₂O₃
54.0 g Al 1 mole 2 moles Al₂O₃ 101.96 g
-------------- x ----------------- x ----------------------- x ---------------- = 102 g Al₂O₃
26.98 g 4 moles Al 1 mole
Answer: 102 for 54.0 and 136 for 64.0
Explanation:
Question 3
Not yet
answered
Points out of
If you dissolve 2.70 g of NaCl in 425 mL of water, what is the molarity of the
solution? (Report your answer to three places past the decimal point. Moodle is
looking for a number only, no units.)
I added a screenshot because I recently answered the same question. I hope this helps you!! :)
What kind of air mass will bring cold, dry weather as it moves toward an area
Answer:
i think the answer is Continental polar air masses
Explanation:
a fossil contains c14 and n14 in the ratio of 1:3 how old is the bone
Answer:
Approximately 11460 Years Old
Explanation:
i looked this up :/
way to much maths for me
The age of the bone given that it contains C-14 and N-14 in ratio of 1:3 is 11460 years
How to determine the percentage remainingC-14 is usually used for radioactive dating (i.e to determine the aga of substance)
From the question, C-14 and N-14 exist in ratio of 1:3.
thus, the amount of C-14 remaining can be obtained as follow:
Ratio of C-14 = 1Ratio of N-14 = 3Total ratio = 1 + 3 = 4Percentage of C-14 remaining =?Percentage of C-14 remaining = 1/4 × 100
Percentage of C-14 remaining = 25%
How to determine the number of half-lives that has elapsedOriginal amount (N₀) = 100%Amount remaining (N) = 25%Number of half-lives (n) =?2ⁿ = N₀ / N
2ⁿ = 100 / 25
2ⁿ = 4
2ⁿ = 2²
n = 2
How to determine the ageHalf-life of C-14 (t½) = 5730 yearsNumber of half-lives (n) = 2Time (t) = ?t = n × t½
t = 2 × 5730
t = 11460 years
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Hich statement about scientific consensus is true? a. it represents the beliefs of most scientists. b. it is the only way to prove a theory true. c. it is necessary to form a hypothesis. d. it is an assurance that the interpretations of a study are correct. e. it is necessary before research can be published in a science journal.
Which are correct statements about the emission spectrum of hydrogen in the visible region
The statement that is correct about the emission spectrum of hydrogen in the visible region is that the line corresponding to the greatest emission of energy is in the ultraviolet region.
What is hydrogen spectrum?Hydrogen spectrum is defined as the dissociation of hydrogen atom upon action of electric current into spectral lines that can be seen in that visible light.
These lines falls under the electromagnetic wave of ultraviolet and infrared regions. But the lines of greatest emission is found in the ultraviolet region.
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4. How many moles of atoms are present in 7 moles of sulfuric acid, H₂SO4?
Avogadro's Number: 6.022 X 1023
a) 7 x 6 x 1023
b) 49
c) 21
d) 7
Answer:
49 moles of atoms
Explanation:
There are 7 individual atoms in each molecule of H2SO4: (2 hydrogens + 1 sulfur + 4 oxygens).
Therefore, if 7 moles are decomposed, there would be 7 times that amount of individual atoms:
7 x 7 = 49 moles of atoms
What functional group is found in a carboxylic acid?
OA. Ester
B. Amino
C. Carbonyl
D. Hydroxyl
Answer:
the answer is c
Explanation:
A carboxylic acid is an organic compound that contains the carboxyl functional group.
Which of the following is used as a thermal insulator?
A. A hot plate to keep the mug warm
B. A ceramic mug filled with coffee
C.a lid to cover the coffee mug
D. A metal spoon to stir the coffee
The work of which scientist was most essential to the use of radioactive isotopes in medicine
The work of John Lawrence scientist was most essential to the use of radioactive isotopes in medicine.
Which scientist use of radioactive isotopes in medicine?John Lawrence was the first scientist that use a radioactive isotope in the treatment of a human disease. He became known as the father of nuclear medicine and his laboratory is considered the birthplace of this field.
So we can conclude that the work of John Lawrence scientist was most essential to the use of radioactive isotopes in medicine.
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Rosalind franklin helped discover the structure of what molecule?.
That would be...*drumroll* the structure of DNA!
Convert 951.9 to scientific notation. for this question, a superscript is displayed using ^ (ex.
108 would be e^8).
Answer:
9.519e^-2
Explanation:
To accurately show the number in scientific notation, you need to move the decimal place to the left 2 spaces. Because you are moving the decimal place to the left, the exponent will be a negative number. Because the decimal place moves 2 units to the left, the exponent will be a -2.
Therefore, the answer in correct scientific notation is:
951.9 ----------> 9.519e^-2
The human skeleton is made mostly
of hard blank
tissue.
When hydrated copper(II) sulfate crystals are heated, anhydrous copper(II) sulfate forms. A mass of 12.5 g of hydrated copper(II) sulfate crystals is heated in a crucible until all the water of crystallisation is removed.
A mass of 8.0 g of anhydrous copper(II) sulfate forms.
Calculate the formula of hydrated copper(II) sulfate CuSO4.nH2O
Show your working.
[Mr of CuSO4 = 159.5 Mr of H2O = 18]
Mass of water = g
Water of crystallization (n) =
Formula of hydrated copper(II) sulfate =
The formula of hydrated copper(II) sulfate is CuSO4.10H2O
What is the formula of the hydrated copper (ii) sulfate salt?The formula of the hydrated copper (ii) sulfate is determined as follows:
Mass of hydrated salt = 12.5 g
Mass of anhydrous salt = 8.0 g
Mass of water = 12.5 - 8 = 4.5 g
mole ratio of water and anhydrous salt is;
4.5/18 : 8.0/159.5
0.562 : 0.05
10 : 1
Water of crystallization (n) = 10.
Therefore, the formula of hydrated copper(II) sulfate is CuSO4.10H2O
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Which of the following is an example of a testable scientific hypothesis?
A.
Why do plants grow better in the Sun than in the shade?
B.
Gorillas are happier in the wild than they are in the zoo.
C.
Roses grow faster in the Sun than in the shade.
A reduction reaction involves either the addition of hydrogen or removal of:
Reduction involves the either the addition of hydrogen and removal of oxygen.
What is reduction?Reduction involves the removal of oxygen.
This implies there is a loss of oxygen in reduction.
This can be represented in the extraction of iron from it ores.
Fe₂O₃ + 3CO → 2Fe + 3CO₂
Reduction is also the addition of hydrogen. This implies it is the gain of hydrogen.
For example
CH₃CHO → CH₃CH₂OH
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