Which of these is not produced when a fuel undergoes complete
combustion?
Carbon monoxide
Carbon dioxide
Water
Answer:
Carbon monoxide
As then Oxygen is available in sufficient amount
Explanation:
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U-238 which has a long half-life is also find the ages of geological formations (rocks). Meanwhile I-131, which has much shorter half-life, is used for diagnosing thyroid disorders. What is the mass of an original 5.6 gram sample of I-131 that is still radioactive after 16.042 days?
The mass after 16.042 days : 1.4 g
Further explanationGiven
mass of 5.6 gram sample of I-131
time=16.042 days
Required
The mass of a sample
Solution
General formulas used in decay:
[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]
T = duration of decay
t 1/2 = half-life
N₀ = the number of initial radioactive atoms
Nt = the number of radioactive atoms left after decaying during T time
Half-life of I-131 = 8 days
Input the value :
[tex]\tt Nt=5.6.\dfrac{1}{2}^{16.042/8}\\\\Nt=\boxed{\bold{1.4~g}}}[/tex]
How many moles of hydrogen atoms are there in one mole of C6H12O2
In 1 molecule of the compound C₆H₁₂O₂ there are 12 moles of hydrogen atoms
Further explanationGiven
C₆H₁₂O₂ compound
Required
moles of Hydrogen
Solution
In a compound, there is a mole ratio of the constituent elements.
The empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
In the C₆H₁₂O₂ compound, there are 3 forming elements: C, H and O
The number of each element is indicated by its subscript
C: 6 moles
H = 12 moles
O = 2 moles
A student wants to use the lever to lift the book. At
which point should she push downward to use the
least amount of force to lift the book?
Compare and contrast carbon dioxide and water.
What does a reaction energy diagram represent ?
A. The changes in concentrations with time
B. The changes in energy during reaction reaction
C. The changes in phases with temperature
D.The changes in the reaction rate with time
Answer:
B. changes in energy during the reaction
Explanation:
y-axis measures "energy" and x-axis measures "reaction progress". Those units fit well with (B) and not so well with concentration and time (A), phases and temperature (C), or reaction rate and time (D).
Answer:
b. changes in energy during reaction
Explanation:
graph
As rocks erode from Earth's surface, they are replaced by the process ____of
A. recrystallization
B. uplift
C. weathering
D. foliation
Answer:
B. uplift is answer
Explanation:
may be this is helpful!
balence the following equation : _____ NH3 --------> _____ N2 + _____ H2
pls can i have the explanation too
2 NH3 -> 1 N2 + 3 H2
Explanation:
That would be the answer to this
GRADEC
Evaluate these two sound waves and determine what property they have in common
A)
They have the same amplitudes.
B)
They have the same wavelengths.
c)
They make the same exact sound.
D)
They have crests in the same position
Answer:
it's-B.....................
the diagram below represents the organization levels of living things. Which of the following examples represents the missing organizational level?
Answer:
The heart
Explanation:
Answer:
The heart
Explanation:
Because its an organ and i got it right ;)
Which BEST explains why the ice cube sank in the liquid?
Answer:
The liquid could be cooking oil
Explanation:
Density contributes to sinking or floating. If this is vegetable oil of something like that, the ice cube will sink.
Question 2
Put the events below in the order in which they happened.
a) The marble is moved up the ramp using a pulley system.
b) The marble is placed on a wooden sled.
c) Iron wedges are used to break the massive marble.
d) Masons begin carving the marble.
b, a, c, d
b, c, a, d
c, d, b, a
c, b, d, a
Answer:
The event placed in order is;
b, a, c, d
Explanation:
1) b) The marble is placed on a wooden sled
Before the marble is lifted up the ramp, it is placed on a wooden sled that allows the pulley system which can be attached to the wooden sled to lift it up the ramp
2) a) The marble is moved up the ramp using the pulley system
The attached pulley system is then used to move the marble up the ramp
3) c) Iron wedges are used to break the massive marble
The massive marble is broken into pieces that can be worked upon by each mason
4) d) Masons begin carving the marble
The masons (more than one mason) begin carving the pieces of marbles into shape
What two conversion factors would you need in order to determine the number of moles of H 2O used to run the reaction?
Answer:
mol ratio and molar mass
Explanation:
30)
A scientific theory is based on
A)
data collected over time.
B)
a general claim by scientist.
0
the best guess of a scientist.
D)
an idea that can only be proven true.
I think it’s (a)but, I’m not sure.
Answer:
D has to be based on facts so d would be the answer and idea that can only be proven true those are facts not hypothesis or guesses
Explanation:
based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world."
In multicellular organismscells that become specialized to perform a specific function are called?
A. Organelle
B. Tissue
C. Organ
D. Epithelial
Answer:
Answer:
C. Organ
Explanation:
definition- "In biology, an organ is a collection of tissues that structurally form a functional unit specialized to perform a particular function.
3. How does the wave change if the volume increases?
Answer:
When you increase the volume of the tone, you are adding energy to the sound wave, resulting in larger vibrations
Explanation:
A sample of a compound contains 24 grams of carbon and 64 grams of oxygen. What
is the empirical formula of this compound?
Answer:
CO2
Explanation:
it's the simplest whole number ratio of atoms of each element in the compound.
Answer:
C2O4
Explanation:
How many electrons will oxygen have to have to have a +2 charge?
Answer: here is your answer hope this helps I’m sorry if I get it wrong
Explanation:
This means that the nuclei of all oxygen atoms have eight protons. A neutral oxygen atom will also have eight electrons. In an oxygen ion with a 2− charge, the number of protons is still 8, but the number of electrons is 10. This results in the oxygen ion having an octet (8) of valence electrons.
. A frog’s heart has ___________ chambers. Two atrium and _____ ventricle.
Answer:
A frog heart has three chambers.two atrium and one ventricle is answer
Explanation:
I hope it's helpful!
he dose of a medicine is 3.0 mg/kg of body mass. Calculate the dose in milligrams for a 112-lb person.
Group of answer choices
300
740
150
3.0 × 105
74
1500
Can frozen ice transfer thermal energy to another substance? if so, how?
Answer:
Matter can change state when thermal energy is transferred into or out of the substance. Ice melts and liquid water boils as thermal energy is added. Water vapor condenses and liquid water freezes as thermal energy is removed.
A person stands on the floor. What does Newton's third law say must happen
A . The floor pushes up on the person
B. the floor will accelerate
C. the person will accelerate
D. Gravity pulls down on the floor.
Please Help!!!!!!!!!!!!!
Answer:
The answer is B, 106
Explanation:
looked it up
How many moles of H3PO4 would produce 12 moles of water in this reaction? ЗKOH + H3PO4 K3PO4 + 3H20
Answer:
4 moles of H₃PO₄
Explanation:
The reaction expression is given as;
3KOH + H₃PO₄ → K₃PO₄ + 3H₂O
Number of moles of water = 12moles
Unknown:
Number of moles of H₃PO₄ = ?
Solution:
From the balanced reaction expression we see that;
3 moles of water is produced from 1 mole of H₃PO₄
So; 12 moles of water would be produced from [tex]\frac{12}{3}[/tex] = 4 moles of H₃PO₄
Answer:4 moles of H₃PO₄
Explanation: did the test homie
A _________ mixture is not well mixed.
A.) Saturated
B.) Insoluble
C.) Homogeneous
D.) Heterogeneous
Need help don’t understand this??!
Answer:
US. With an installed capacity of 3,639MW in 2018, the US is the leading producer of geothermal energy across the world, producing 16.7 billion kilowatt hours (kWh) of geothermal energy throughout the year. ...
Indonesia. ...
Philippines. ...
Turkey. ...
New Zealand. ...
Mexico. ...
Italy. ...
Iceland.
Why are models used to represent Atoms
Answer:
C
Explanation:
Different scientific models are used to represent an atom. It is because atoms are too small to see and to study their structure and electronic properties we need a model.
What are scientific models?Scientific models are visual representations or mathematical expression to make a scientific concept easy to understand. Atomic models are scientific models to represent the atomic structure and properties.
There are various theoretical models for atomic structure in which the latest one is Bohr's model. This model suggests that the electrons are revolving around the nucleus through circular paths of definite energies.
Subatomic particles, electrons, protons, and neutrons are microscopically small and we can't make its clear picture by reality. Therefore, using suitable experiments and assumptions scientists are proposing various theoretical models for atomic structure.
To find more on atomic models,refre here:
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Which of these landforms is created due to deposition?
O Cirque
O Fjord
O Horn
O Sandbars
Answer: sandbars
Explanation:
Does water evaporates only from the sea
Frank has a paper clip. It has a mass of 9g and a volume of 3cm3. What is
its density?
A. 1/3 g/cm3
O B. 3 g/cm3
C. 39 g/cm3
D. 27 g/cm3
Answer:
B. 3 g/cm³
Explanation:
Given data:
Mass of paper clip = 9 g
Volume of paper clip = 3 cm³
Density of paper clip = ?
Solution:
Formula:
d = m/v
Density is equal to the mass of substance divided by its volume.
Units:
SI unit of density is Kg/m3.
Other units are given below,
g/cm3, g/mL , kg/L
by putting value,
d = 9 g / 3 cm³
d = 3 g/cm³
