The Correct option is C.
Nuclides below the valley of stability can become more stable through the process of positron emission.
What is Positron emission?Positron emission tomography (PET) is a technique that measures physiological function by looking at blood flow, metabolism, neurotransmitters, and radiolabelled drugs. PET offers quantitative analyses, allowing relative changes over time to be monitored as a disease process evolves or in response to a specific stimulus.
This technique is based on the detection of radioactivity emitted after a small amount of a radioactive tracer is injected into a peripheral vein. The tracer is administered as an intravenous injection usually labelled with oxygen-15, fluorine-18, carbon-11, or nitrogen-13.
Nuclides below the valley of stability can become more stable through the process of positron emission.
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What is the mass of 4.57 x 1021 molecules of ammonia (NH3)?
Answer:
4665.97
Explanation:
A 10.150g sample of a compound known to contain phosphorus and oxygen yields 5.717 g of oxygen. Find the empirical formula of the compound
Answer: The empirical formula is [tex]P_2O_5[/tex]
Explanation:
Mass of O = 5.717 g
Mass of P= (10.150-5.717) g = 4.433 g
Step 1 : convert given masses into moles.
Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{5.717g}{16g/mole}=0.357moles[/tex]
Moles of P=[tex]\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{4.433g}{31g/mole}=0.143moles[/tex]
Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.
For O = [tex]\frac{0.357}{0.143}=2.5[/tex]
For P =[tex]\frac{0.143}{0.143}=1[/tex]
The ratio is to be converted to whole number
Thus whole number ratio of O : P = [tex]2.5\times 2:1\times 2=5: 2[/tex]
Hence the empirical formula is [tex]P_2O_5[/tex]
which of the following describes the properties of a substance?
A. how it reacts with other chemicals.
B. how it behaves.
C. all of these.
D. how it looks
Microorganisms have a major role in maintaining soil biodiversity. They recycle nutrients in ecosystems and decompose organic matter in soil. Organic matter contains dead and living plant and animal materials. Microorganisms convert these materials into simpler compounds that maintain soil quality and help with plant growth.
Which solution could best help to restore or increase microorganisms and soil biodiversity?
A.
adding manure or compost to the soil
B.
spraying chemical weed-killers and fertilizers on the soil
C.
removing all ground-covering plants from the soil
D.
adding sewage containing synthetic materials to the soil
Answer:
A i think
Explanation:
The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.
What are microorganisms?A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.
“Microorganisms are minute organisms that are invisible to the normal eye.” Microorganisms are so small that they can only be seen under a microscope. These include a huge range of organisms such as bacteria, viruses, fungi, algae, protozoa, etc.
Given options are-
A. adding manure or compost to the soil
B. spraying chemical weed-killers and fertilizers on the soil
C. removing all ground-covering plants from the soil
D. adding sewage containing synthetic materials to the soil
Therefore, The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.
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How do I perform a titration on coca-cola or Pepsi, when I cannot see the color change because the color is too dark. The indicator is phenolphthalein.
Answer: maybe you need to do very dilute solution?
Explanation: you should have an pH meter instead of indicator.
Phosphoric acid H3PO4 have three ekvivalent points.
Another way could be using a conductivity meter.
If yeast is given more sugar will they undergo more
cellular respiration than yeast that is given less sugar?
Answer:
True
Explanation:
Cellular respiration is a metabolic pathway that allows cells to take apart food molecules and use their atoms as an energy source. This pathway takes electrons from food molecules and transfers them to oxygen, has energy transferred to ATP and arranges molecules into water, carbon dioxide and waste.
A student suggests that the colorless liquid collected in the U‐tube is water.
Describe how to test the colorless liquid to show it contains water.
Answer:
How would you confirm that a colourless liquid given to you is pure water? A very easy solution is to take a sample of the colourless liquid and put it on the stove if it starts boiling exactly at 100 ºC then it is pure water. Any other colourless liquid such as vinegar always has a different boiling point.
2. What percentage of the offspring
will have the red flowers?
Answer:
1/4 of the offspeing will have the red flowers
PLEASE HELP I LITERALLY CAN'T
What volume does 1 mol of Ar(g) occupy at 25 C and 100 kPa?
a) 24.8 L
b) 1.0 L
c) 22.4 L
d) 40.0 L
What volume is occupied by 1 mol of Cl2(g) at SATP?
a) 12.4 L
b) 11.2 L
c) 22.4 L
d) 24.8 L
The amount of volume will be (1) 23.10 L and ( 2) 22.4 L by using gas law.
What is gas law?
Gas law gave the relation between pressure, volume and temperature.
It can be expressed as:
PV = nRT.
where, P is pressure, R is gas constant and T is temperature.
Calculation of volume by using gas law.
1) Given data:
n = 1 mol
T = 25 degree C = 25 + 273 =
P = 100 kpa
Volume can be determined by the gas law.
PV = nRT
V = nRT/P
V = 1 × 8.31 × 278 / 100
V = 23.10 L
2) It is known that at STP 1 mol of any gas volume will be 22.4 L.
Therefore, the correct answer will be option (c).
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Bloc ate 1 craft craft had 3 crafts. How much crafts are there?
(12) Magnesium metal burns very brightly to produce heat and a white solid.
What type of chemical reaction is taking place?
An endothermic
B exothermic
C reduction
D thermal decomposition
Answer:
exothermic
Explanation:
heat/energy is released when it burns.
The spreading of a mechanical wave into the region behind an obstruction is called --------- what ?
Diffraction occurs whenever a portion of a wavefront is obstructed by some opaque object.
A gas has an initial volume of 15 L. If the temperature increases from 330 K to 450 K, what is the new volume.
Answer:
20.(45)L or about 20.4545L
Explanation:
PV = nRT
Where:
P - pressure
V - volume
n - number of particle moles
R - a constant
T - temperature in K
We can assume the P and n (and definitely R) stay the same, so we infer that
[tex]V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L[/tex]
What does the mole ratio represent
Answer:
A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction
Explanation:
Convert 160g to mg.
Answer:
160 grams is equal to 160,000 milligrams.
Explanation:
Please like and mark brainliest!
Hope it helps!
Answer:
1g=1000mg
160g=160000
How would I make a biodegradable mask
Answer:
Explanation:
Go to a craft store and buy so me material that are biodegradable
1. An unknown compound was found to have a percent composition of: 47.0%
potassium, 14.5% carbon, and 38.5 % oxygen. What is its empirical formula? If
the true molar mass of the compound is 166.22 g/mol, what is its molecular
formula?
Answer:The empirical formula is KCO2
Explanation:
Which best describes the products of a
chemical equation?
A. Chemicals before the reaction starts
B. Chemicals after the reaction ends
C. Chemicals on the left of the arrow
D. Chemicals on the right of the arrow
Answer:
b?
Explanation:
Chemicals after the reaction ends during chemical equation. Therefore, the correct option is option B among all the given options.
What is chemical equation?In chemistry, you will frequently come across a chemical equation. It is a textual depiction of the procedure that takes place throughout a chemical reaction using numbers and symbols.
The reactants are placed on the left side of such an arrow in a chemical equation, while the reaction's products are placed on the right. Though certain equations may imply equilibrium with the reaction occurring in both directions simultaneously, the tip of the arrow normally heads toward the right or product side of the equation. Chemicals after the reaction ends during chemical equation.
Therefore, the correct option is option B.
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1. What is a common example of a converging mirror?
2. Where must you (the object) stand in front of a converging mirror if you want to see an upright,
virtual image of yourself? What is the size of the image compared to the object?
3. A converging mirror produces no image when the object is at
4. If the centre of curvature in a converging mirror is at 10cm, the focal point will be at
om
sorry I don't know 4one
i HOPE IT'S HELP
Which is a property of a covalent compound?
A.being shaped easily
B.good electrical conductivity
C.low melting point
Answer:
c: low melting point
Explanation:
melting point is dependent on intermolecular forces. in covalent compounds, electrons are shared more equally. this means there is less separation of positive and negative charges within the molecules.
The Moon only emits light at night.
True
False - does not emit light at all
Answer:
It's trueeeeeee:))))))
Answer:
TRUE
Explanation:
What is the ratio of the number of molecules in 1 L of CO2(g) to the number of molecules in 1 L of CH4(g) at the same temperature and pressure? * 2 points 1:1 3:5 1:2 2:4
Answer:
1:1
Explanation:
Based on Avogadro's law, the volume of an ideal gas is directly proportional to the moles (Or number of molecules) presents of this gas under constant temperature.
The volume of the gas is independent to the nature of the gas
Using this law, we can change the state as:
X number of molecules of CO₂ in X number of molecules of CH₄ (Because are occupying the same volume). That means the ratio of molecules is:
1:1Help me pretty please
Compare the drops of wax that harden in hot water and Cold water.
Answer: They are are simular because when the wax cools down its not hot or it cools down it is the same with hot water it cools after along while.
Explanation:
If a sound wave refracts, what happens to it? Select all that apply.
It changes its speed and wavelength when it bounces off of a solid surface.
B
It changes direction when it passes through an opening
С
It changes its speed and wavelength when it passes through an opening
D
It changes direction when it passes from one medium to another
E
It changes its speed and wavelength from one medium to another.
F
It changes direction when it bounces off of a solid surface.
If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.
What is refraction of sound wave ?An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.
Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.
If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Sound propagates in all directions from a point source.
Thus, option A, C and D are correct.
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Viruses are not considered organisms, because they lack many of the characteristics of living things. A virus is essentially a string of genetic material in
a protein coat. Some viruses contain DNA, while others, called retroviruses, contain RNA. One example of a retrovirus is HIV, which causes AIDS
How is RNA different from DNA? Choose the 2 statements that apply
A. DNA and RNA use different sets of nitrogen bases.
B
DNA has 1 strand of genetic material while RNA has 2 strands
C. DNA contains deoxyribose sugar and RNA contains ribose sugar,
D. DNA and RNA are proteins
Answer:
well, I think the answer is C
The difference between RNA and DNA are:
A. DNA and RNA use different sets of nitrogen bases.
C. DNA contains deoxyribose sugar and RNA contains ribose sugar.
What are RNA and DNA?DNA and RNA, both are genetic materials, but DNA is double-stranded and RNA is single-stranded.
DNA is present in all animals and plants, and RNA is present in viruses and bacteria.
Both are made up of nitrogenous bases and sugar.
Thus, the correct options are A and C.
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A. How do the following factors affect the spontaneity of a reaction?
i. Enthalpy
ii. Entropy
what happens to the rate of a reaction as the reaction progresses
Most large mountains are the result of a(n)?
River
Volcano
Earthquake
Hurricane
Answer:
C.) Earthquake
Explanation:
Most mountains occur due to the movement of tectonic plates. They slowly push into each other, and the earth's crust rises over time forming mountains.
Earthquakes occur due to the shift of tectonic plates. It sends seismic waves throughout the earth's crust, and causes the ground to shake temporarily.
ng.
3. Connect to Technology How do probes,
including landers and rovers, improve our
ability to make observations of other planets?
s