Answer: A
Explanation:
Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute. If the half-life for carbon-14 is 5720 years, how old is a wood sample that gives a rate for carbon-14 decay of 7.9 counts per minute?
A. 5.3 x 102 yr.B. 7.6 x 102 yr.C. 1.1 x 103 yr.D. 9.5 x 103 yr.
The question is incorrect, the correct question is;
Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute. If the half-life for carbon-14 is 5720 years, how old is a wood sample that gives a rate for carbon-14 decay of 11.9 counts per minute?
Answer:
C. 1.1 x 103 yr
Explanation:
A = count rate of the wood sample
Ao= count rate of a living tissue
t1/2= half life of C-14
t = time taken
From;
0.693/t1/2 = 2.303/t log Ao/A
0.693/5720 = 2.303/t log (13.6/11.9)
1.2 * 10^-4 = 2.303/t * 0.05799
1.2 * 10^-4 = 0.1336/t
t = 0.1336/1.2 * 10^-4
t = 1.1 x 103 yr
True or False
ATP energy is used to move muscles and build protein in your body
11. Chemist Ernest Rutherford performed the gold foil experiment in which he concluded the
atom is mostly empty space, with a small, dense, positively charged center. Rutherford's
discovery of the proton did not fully account for the entire mass of the atom. Which is an
example of research that extended Rutherford's findings?
a. De Broglie viewed electrons exhibiting wave-like behavior.
b. Bohr concluded that electrons orbit the nucleus in set circular paths.
c. Chadwick determined the charge of the neutron to be neutral and its mass similar to
that of a proton.
d. Thomson determined that the atom consists of negatively-charged particles.
Answer:
c. Chadwick determined the charge of the neutron to be neutral and its mass similar to that of a proton.
Explanation:
The research that furthered Rutherford's work is the discovery made by James Chadwick who determined the nature of neutron.
Rutherford was inadequate to characterized the composition of the nucleus. This furthered the curiosity of Chadwick by which he discovered the neutrons. The mass of the neutrons is similar to that of the protonsTogether they account for the mass number of the atom. The neutrons do not carry any charges on them.
The sun is the biggest source of visible_
energy caused by the movement of waves of
_____
Answer:
the sun is the biggest source of visible (solar?) energy caused by the movement of waves of (electromagnetic?)
Not confident sry :(
Explanation:
How do substances and mixtures diifer
The composition of one is always the same, and the composition of the other varies
One contains only one type of atom, and the other contains two or more
One is always homogeneous, and the other is always heterogeneous
One contains one type of molecule, and the other contains two types
it for 100 points please give it correctly.
Answer:
hello hope this helps :)
a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.
Explanation:
a pea plant which produces green pods is crossed with a pea plant which produces yellow pods. the resulting offspring had green pods. with respect to pod color the genotype of the offspring is most likely
Answer: the green plant probly was the more domanate with a gentype of TT or Tt
Explanation:
it took after the green plant make it more domanate
The term "genotype" can also reference towards the alleles or variations that an individual possesses. The green plant was most likely the most dominant, having a genotype of TT or Tt.
What is genotype?An organism's genotype is its whole collection of genetic material. The term "genotype" can also reference towards the alleles or variations that an individual possesses in a certain gene or genetic region. The amount of alleles a person can have in a particular gene is determined by the amount of duplicates of each chromosome contained in that species, which is also known as ploidy.
Diploid organisms, such as humans, have two complete sets of chromosomes, implying that each person possesses two alleles for each given gene. When both alleles are identical, the genotype is said to be homozygous. When the alleles were distinct, the genotype is called heterozygous. The green plant was most likely the most dominant, having a genotype of TT or Tt.
Therefore, the green plant was most likely the most dominant, having a genotype of TT or Tt.
To learn more about genotype, here:
https://brainly.com/question/10644243
#SPJ6
A _____________reaction mechanism involves loss of a leaving group, formation of a ________ followed by the removal of a proton (H ) from the adjacent Carbon.
A. electrophile
B. carbocation
C. E1
D. E2
E. nucleophile
Answer:
The correct answer is Option C (E1) and Option B (carbocation).
Explanation:
Intramolecular immunity idols are considered as that of the formation mechanism with E1 responses or reactivity. Reactants with E1 were indeed obligations of both parties, meaning that an E1 reaction was conducted thru all the two stages known as ionization but rather deprotonation. Involves the absence of either an aromatic ring, a carbocation has been generated throughout the ionization solution.Some other possibilities offered aren't relevant to the procedure outlined. So the above alternative is accurate.
Question 14 Multiple Choice Worth 2 points) If we have less power, we most likely have A. the same amount of work being done over a shorter period of time B. more work done over a shorter period of time C. more work done over the same amount of time D. the same amount of work being done over a longer period of time
Answer:
its c
Explanation:
Answer:
A. the same amount of work being done over a shorter period of time
Explanation:
I believe. Sorry if it is incorrect.
How many atoms are in 8.2 moles of magnesium
Answer:
4.93804*10^24 atoms
Explanation:
Hope this helped!
how many valence electrons in an oxygen atom?
Answer:
6 valence electrons
Explanation:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom. For example, oxygen has six valence electrons, two in the 2s subshell and four in the 2p subshell.
How many atoms of hydrogen in the product side of the balanced equation?
Fe + H2O ---> FeO + H2
A) 2
B) 3
C)6
Answer:
i think the answer should be a
Your aunt is sipping on iced tea and fanning herself during a hot South Carolina summer day. You tell her that there is enough energy in one drop of her iced tea to run the air conditioner for the rest of her life if the energy could be extracted with 100% efficiency. Your aunt asks you to explain. Use the concepts you learned in this unit to explain the relationship between forces, energy, and matter.
Answer:
Isn't this like having enough energy to supply the world for centuries with just 1% of the sea's force?
Explanation:
I guess it's because the amount of energy in it can supply energy.
Is temperature beginning to rise a physical or chemical change?
Answer:
If temperature increases, as it does in most reactions, a chemical change is likely to be occurring. This is different from the physical temperature change. During a physical temperature change, one substance, such as water is being heated.
Explanation:
Answer:
the least of these are to get some good deals for a circle for your business
Explanation:
GG have been in which I was not have a chance of the square and it
Nick needs 3.5 moles of sodium fluoride (NaF) for a solution he is mixing in the lab. How many grams of NaF does Nick need to measure out?
Answer:
147 g
Explanation:
The number of moles of a substance is the ratio of the mass of the substance and the molar mass of that substance. Mathematically,
mole = mass of substance/molar mass
In this case, Nick needs 3.5 moles of NaF, the molar mass of NaF is calculated as:
23 + 19 = 42 g/mol (Note: Na = 23, F = 19)
Hence,
mass of 3.5 mole NaF = mole x molar mass
= 3.5 x 42 = 147 g.
Hence, Nick would need to measure out 147 g NaF using a suitable weighing balance.
need help asap........................................
Answer:
its a
Explanation:
beacause the movement goes forward
Answer the in under 30 minutes and I will give brainliest
After which event in Indonesia did one of the worst tsunamis form?
a hurricane
a volcanic eruption
a landslide
an earthquake
Answer: I believe the answer is an earthquake.
Explanation: Sorry If I am wrong!
Answer:
earthquake
Explanation:
I took the k12 test
b. Change the following sentences from passive to active
i. The kids have served the family with dinner.
ii. The police have been watching the house for weeks.
iii
. I was doing my homework when the lights went off.
Answer:
the family have been served dinner with the kids
the house has been watched by the police for week
the lights went off when i was doing my home work
To evaluate R. the volume of a gas measured in the temperature of the gas is measured in
while
Answer:It is necessary to use Kelvin for the temperature and it is conventional to use the SI unit of liters for the volume.
Explanation:
However, pressure is commonly measured in one of three units: kPa, atm, or mmHg. Therefore, can have three different values.
Answer: liters; Kelvin
Explanation:
what is an atomic element of carbon
Answer: do u mean atomic number? The atomic number for carbon is 6
Explanation:
Answer:
Chemical element
Explanation:
Carbon is a chemical element with the symbol C and atomic number 6. It is nonmetallic and tetravalent—making four electrons available to form covalent chemical bonds. It belongs to group 14 of the periodic table. Carbon makes up only about 0.025 percent of Earth's crust.
What’s a good summary for pseudoscience?
Answer:
Beliefs or practices that are regarded as "scientific" and "factual" but have not been proven nor are they backed by science.
Explanation:
Example: Astrology
How many known elements have atoms, in their ground-state, with valence electrons whose quantum numbers are n = 5 and l = 1?a. 36..
b. 37.
c. 6.
d. 8.
Answer:
c. 6.
Explanation:
Looking at the description given in the question, the elements involved must belong to the p- block of the periodic table and must be in period 5. They also must possess valence electrons in the 5p- orbital.
Now if we look at the p- block of period 5, the following elements satisfy these requirements; Sr, In, Sn, Sb, Te and I.
Hence there are six of such elements.
The chemical elements that have atoms, in their ground-state, with valence electrons whose quantum numbers are n = 5 and l = 1 are: C. 6.
What is a valence electron?A valence electron can be defined as the number of electrons that is present in the outermost shell of an atom.
In Chemistry, valence electrons are primarily used to determine whether an atom or group of chemical elements that are found on the periodic table can bond with others.
Based on electronic configuration, quantum numbers of n = 5 and l = 1 simply represents a 6p orbital and there a total of six (6) chemical elements with this orbital, and these include;
ThalliumLeadRadonAstatinePoloniumBismuthRead more on valence electrons here: https://brainly.com/question/16554158
What element has the noble gas configuration [Ne]3s23p??
Answer:
Sulfur
Explanation:
The first ten electrons of the sodium atom are the inner-shell electrons and the configuration of just those ten electrons is exactly the same as the configuration of the element neon (Z = 10).
...
Noble Gas Configurations.
Element Name Sulfur
Symbol S
Atomic Number 16
Noble Gas Electron Configuration [Ne]3s23p4
bonds. Carbon dioxide has a. Ionic b. Covalent c. Nonpolar covalent d. Polar covalent
Answer:
B
Explanation:
Covalent bond.
How much more pressure does a 250 lb person exert on the ground than a 120 lb person if they are both standing on one foot with area 16 in2?
Answer:
57.124.18 Pascals
Explanation:
The pressure that each person exerts on the ground is given by:
Pressure = force/area
The force that each person exert is given by:
Force = mass (kg) x acceleration due to gravity (10 m/s2)
1 lb = 0.4536 kg, hence;
250 lb person = 113.398 kg
120 lb person = 54.431 kg
Force exerted by the 250 lb person = 113.398 x 10 = 1133.98 kg/m2
Force exerted by 120 lb person = 54.431 x 10 = 544.31 kg/m2
16 inch2 = 0.0103226 m2
Pressure exterted by 250 lb person = 1133.98/0.0103226
= 109,854.11 pascals
Pressure exerted by 120 lb person = 544.31/0.0103226
= 52,729.93 Pascals
Difference in pressure = 109,854.11 - 52,729.93
= 57,124.18 Pascals
Hence, a 250 lb person will exert 57.124.18 Pascals pressure more than a person of 120 lb on a foot with a 16 inch2 area.
What is the volume of 100 g neon at STP?
Answer:
Well
STP
specifies 100⋅kPa,and 273.15⋅K...
Explanation:
And so we solve for n
moles of gas
in the Ideal Gas equation, and of course we have to fish out an appropriate gas constant...
n=PVRT=100⋅kPa×10⋅L8.314⋅L⋅kPa⋅K−1⋅mol−1×273.15⋅K
=0.440⋅mol
And thus a mass of 0.440⋅mol×20.18⋅g⋅mol−1...approx. 9⋅g...
Explanation:
Question in picture plsss help
Answer:
2nd answer is correct. Hope it helped you!
How do atoms form chemical bonds
Answer:
Atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. A chemical bond is a force of attraction between atoms or ions. Bonds form when atoms share or transfer valence electrons. In a covalent bond, two atoms share one or more electrons.
At room temperature, one of the molecules is a gas and one is a liquid. Identify which structure is a gas and which is a liquid.
At which part of a river would you have the best luck growing food?
A. Bend
B. Delta
C. Alluvial fan
D. Source
Answer:
B. Delta
Explanation:
Which products of photosynthesis does your body break down to be used for cellular respiration?
Answer:
Photosynthesis makes the glucose that is used in cellular respiration to make ATP. The glucose is then turned back into carbon dioxide, which is used in photosynthesis. While water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.
hope this helps!