Someone please help will mark as brainliest please answer all of the questions
Answer:
1.The main difference between SPECT and PET scans is the type of radiotracers used. While SPECT scans measure gamma rays, the decay of the radiotracers used with PET scans produce small particles called positrons. ... These react with electrons in the body and when these two particles combine they annihilate each other.
2 .A single photon emission computed tomography (SPECT) scan is an imaging test that shows how blood flows to tissues and organs. It may be used to help diagnose seizures, stroke, stress fractures, infections, and tumors in the spine.
3.Uses for PET scan include checking brain function; diagnosing cancer, heart problems, and brain disorders; examining blood flow to the heart; and determining spread of cancer and response to therapy. The use of PET scans may help doctors more accurately detect the presence and location of cancer cells.
4.Stress-only SPECT protocols resulting in lower dosimetry and less time in the imaging laboratory may be appropriate for many patients. PET perfusion imaging offers indisputably better images that are characterized by higher resolution, better attenuation correction, less scatter, and better contrast
Hope I wasn't too late.
Which of the following describes redox in displacement plating?
What is the speed of an object that covers 10 miles in 5 hours?
a. 5 mph
b. 15 mph
c. 2 mph
d. 50 mph
Answer:
2 miles per hour.
Explanation:
10/5=2
To solve this we must be knowing each and every concept related to speed and its calculations. Therefore, the correct option is option C.
What is speed?Speed may be defined as the distance traveled by an item in the amount of time it requires to travel that distance. In other words, it measures how rapidly an item travels but does not provide direction.
The Scientific unit system is most typically used to express speed. Speed is determined in metres per second, or m/s, since distance is recorded in metres while time is recorded in seconds.
Mathematically,
speed= distance/ time
distance= 10 miles
time= 5 hours
substituting all the given values in the above equation, we get
speed=10/5
on calculations, we get
speed = 2 mph
Therefore, the correct option is option C.
To learn more about speed, here:
https://brainly.com/question/13263542
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Most of the elements on the Periodic Table are metals.
True
False
Answer:
the answer is true
Explanation:
I hope so it is helpful to u
Name the Ionic Compounds listed below.
1.) Al2O3 =
2.) NaCl=
3.) MgO =
4.) CaCl2=
Answer:
1. Aluminum oxide
2. Sodium chloride
3. Magnesium oxide
4. Calcium Chloride
Explanation:
Ionic compounds with only 2 elements all end with "ide" Use the full name of the element listed first and the second element with ide. Ex: Chlorine would become chloride.
Answer:
Explanation:
1. Al2O3 = Aluminum Oxide
2. NaCl = Sodium Chloride
3. MgO = Magnesium Oxide
4. CaCl2 = Calcium Chloride
What is the name of the following chemical compound?
Answer: Dinitrogen pentoxide
Explanation:
Answer:
Dinitrogen Pentoxide
Explanation:
A 10g sample of Fe reacts with O to form 18.2g of FeO. How many grams of O reacted?
Answer:
Mass of O = 8.2 gram
Explanation:
Given:
Mass of Fe = 10 g
Total volume = 18.2 g
Find:
Mass of O
Computation:
Using Conservation of total mass
Total volume = Mass of O + Mass of Fe
18.2 = Mass of O + 10
Mass of O = 8.2 gram
if the mass of 3 black beans it's 0.7 what's the mass of one bean?
Answer:0.233333333
Explanation: Let me be!
Answer:
yea what that guy said is correct I'm pretty sure
Do bacteria help people?? This is science but there is no tab
Answer:
Yes
Explanation:
Some bacteria is good for you like the bacteria in your digestive system, which helps with breaking down food and keeping you healthy
Which of the following is a characteristic of covalent compounds?
How many moles of Mg(OH)2 will react with 2.5 mol HCI?
Answer:
1.25mole of Mg(OH)₂
Explanation:
The reaction is between Mg(OH)₂ and HCl, this is a neutralization reaction between an acid and a base.
Mg(OH)₂ + 2HCl → MgCl₂ + 2H₂O
The balanced reaction equation is given above.
2 mole of HCl reacts with 1 mole of Mg(OH)₂
So, 2.5mole of HCl will react with [tex]\frac{2.5}{2}[/tex] = 1.25mole of Mg(OH)₂
The number of moles of Mg(OH)₂ is given as 1.25mol
What Group would this element be in?
Answer:
Non-metals because it has 9 electrons meaning it is fluorine
Explanation:
Predict the precipitate that will be formed in the following reaction:
NaF(aq) + AgNO3(aq) →
The precipitate that will be formed : AgF
Further explanationOne indication of the double displacement reaction is the precipitation reaction
Solubility Rules:
• 1. soluble compound
All compounds of Li +, Na +, K +, Rb +, Cs +, and NH4 +
All compounds of NO₃⁻ and C₂H₃O₂⁻
Compounds of Cl−, Br−, I− except Ag⁺, Hg₂²⁺, Pb²⁺
Compounds of SO₄²⁻ except for Hg₂²⁺, Pb²⁺, Sr²⁺, Ba²⁺
• 2. insoluble compounds
Compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li +, Na +, K +, Rb +, Cs +, and NH₄ +
Compounds of OH− except Compounds of Li +, Na +, K +, Rb +, Cs +, NH₄⁺, Sr²⁺, and Ba²⁺
Reaction
NaF(aq) + AgNO₃(aq) →NaNO₃(aq)+ AgF(s)
From the solubility rules above, it has been shown that the salts of the Ag⁺ cations are insoluble salts
The world's largest importer of fish products is:
A. Japan
B. China
C. United States
D. Norway
PLEASE GICE ME THE RIGHT ANSWER MY GRADES ARE BADDDD
Answer:
A. Japan
Explanation:
Answer:
japan xd
Explanation:
6CO2 + 6H20 --> C6H12O6 + 602
What is the total number of grams of water needed to make 6.2 moles of CoH1206?
79.5 g
402.9
670.2 g
381.2 g
which two elements make up the main structure of an organic compound?
A. Carbon and oxygen
B. Nitrogen and oxygen
C. Carbon and hydrogen
D. hydrogen and sulfur
Answer:
b nitrogen&oxygen
Explanation:
i'm built different
What is another name for a row on the periodic table?
Answer choices :
Group
Period
Family
Transition Metals
What is the percentage composition of each element in carbon dioxide, CO2? Remember percent composition is based on mass. (Show your calculations for full credit.)
%C = 27.3%
%O=72.7%
Further explanationProust states the Comparative Law that compounds are formed from elements with the same Mass Comparison, so that compounds have a fixed composition of elements
The empirical formula is the mole ratio of compounds forming elements.
MW CO₂ : 44 g/mol
Ar C = 12 g/mol
Ar O = 16
%C[tex]\tt \dfrac{12}{44}\times 100\%=27.3\%[/tex]
%O[tex]\tt \dfrac{2.16}{44}\times 100\%=72.7\%[/tex]
I pushed a 2 kg car with an 8 N force. Calculate the acceleration.
Answer:
4 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{8}{2} \\ [/tex]
We have the final answer as
4 m/s²Hope this helps you
Which group of elements in the periodic table contains the noble gases?"
O Group 1
O Group 13
O Group 10
O Group 18
Answer:
its the 4th one (group 18 )
What is the affected variable in an experiment. A:independent. B:dependent. C:control
In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
IamSugarBee
How long would it take a current of 10A to deposit 6.36g of copper during the electrolysis of copper (ll) tetraoxosulphate VI solution. (Cu = 63.5,1F=96500C)
Cu2+ + 2e- Cu
It take 0.54 hours to deposit 6.36g of copper
Further explanationFaraday's Law I
"The mass of the substance formed at each electrode is proportional to the electric current flowing in the electrolysis
W = e.i.t / 96500
[tex]\tt \large {\boxed {\bold {W \: = \: \dfrac {e \times i \: x \: t} {96500}}}}[/tex]
e = equivalent = Ar / valence
i = current, A
t = time, s
W=6.36 g
e = 63.5 : 2 =31.75
i = 10 A
[tex]\tt t=\dfrac{W\times 96500}{e.i}\\\\t=\dfrac{6.36\times 96500}{31.75\times 10 }\\\\t=1933.04~s\approx 0.54~hours[/tex]
What type of reaction does each of the following equations represent?
A. Single replacement
B. Double replacement
C. Decomposition
Answer:
Option C. Decomposition
Explanation:
To know which option is correct, it is important we know what is a single displacement reaction, double displacement reaction and decomposition reaction.
A Single displacement reaction can be defined as a reaction in which a single element is replaced by another element in a compound.
A double displacement reaction is a reaction involving the exchange of ions of two parts of ionic compounds to form two different compounds.
A decomposition reaction is a reaction in which a compound splits into two or more simpler compound or element.
Bearing the above definitions in mind and considering the question given above, we can conclude that the reaction given in the question above is a decomposition reaction since the compound (NH₄OH) splits into two different compound (NH₃ and H₂O)
Which element could provide one atom to make an ionic bond with calcium
How would a drop in pressure affect a gaseous system at equilibrium?
A. The reaction would slow down, but the number of moles of gas
would not change.
B. The number of moles of gas of reactants and products would
increase.
C. The reaction would shift to favor the side with the least moles of
gas.
D. The reaction would shift to favor the side with the most moles of
gas.
The reaction would shift to favor the side with the most moles of gas.
A.P.E.X. b/c yk that's why you're here :)
I need help......................
The answer is -1 as they gain 1 electron
Sodium metal and chlorine gas are combined in a reaction to produce sodium chloride also known as table salt. What are the reactants?
Group of answer choices
Sodium metal only
Chlorine gas only
Sodium Chloride (salt)
Chlorine gas and Sodium Chloride (salt)
Sodium metal and Chlorine gas
Answer: sodium metal and chlorine gas
Explanation:
Anyone know the answer
Answer:
a and d
Explanation:
a bromine and the calcium atom loses two elections
Question 14
An element's periodic table identity is defined by its number of
А.
neutrons.
B
isotopes.
С C
electrons.
protons
Answer:
c
Explanation:
protons are the atomic number which define an element
Write one paragraph explaining what you have learned so far about Kinetic and Potential Energy.
(will give brainliest)
Answer: Energy stored in an object due to its position is Potential Energy. The energy that a moving object has due to its motion is Kinetic Energy. All forms of kinetic energy are the result of a previous state of potential energy. For example, the stored chemical potential energy of a battery converts to electrical kinetic energy to transport electricity to a light bulb, which radiates thermal kinetic energy. Potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.