Answer:
2486 g
Explanation:
First we calculate how many moles of MgBr₂ are required to create such a solution, using the definition of molarity and the given volume and concentration:
Molarity = moles / liters4.5 M = moles / 3.0 Lmoles = 4.5 M * 3.0 L = 13.5 molNow we convert 13.5 moles of MgBr₂ into grams, using its molar mass:
13.5 mol * 184.113 g/mol = 2486 ghow many significant figures are in the measurement 12.4 kg
Why does nobody fking answer my questions.
How did stromatolites contribute oxygen to the early atmosphere?
through methane degradation
through photolysis
by weathering of rocks
through photosynthesis
Answer:
by wearing of rocks
Explanation:
earths gravity your welcome
Answer:
weathering of rocks is the answer to your question
TICLA ruuis SLCLLICU 10115CI.
Question 3 (1 point)
Which option correctly ranks the states of matter from slowest to fastest particle
speed.
gas, liquid, solid
solid, liquid, gas
solid, gas, liquid
gas, solid, liquid
Which particles make up most of the mass of an atom?
i think Neuterons i am right
Answer:
I do not know srry
Explanation:
2.
You take a gas at 3 atm and increase the temperature from 120 K to 240 K. What is the final pressure?
A
6 atm
B
Not enough information
C
3 atm
D
1.5 atm
Answer:
A. 6atm
Explanation:
Using pressure law equation:
P1/T1 = P2/T2
Where;
P1 = initial pressure (atm)
T1 = initial temperature (K)
P2 = final pressure (atm)
T2 = final temperature (K)
According to this question;
P1 = 3 atm
P2 = ?
T1 = 120K
T2 = 240K
Using P1/T1 = P2/T2
3/120 = P2/240
Cross multiply
240 × 3 = P2 × 120
720 = 120P2
P2 = 720/120
P2 = 6atm
What causes lava to not instantly melt ice sheets when it is poured onto it?
Answer:
Dry ice
Explanation:
Answer:
The lava doesn't melt through ice because the steam ice sits on top of a blanket of steam rather than on top of the ice itself. This means the friction between the lava and the ice is very low.
Explanation:
Equal masses of two substances absorb the same amount of heat. The temperature of a substance A increases twice as much as substance B. Which substance has a higher specific heat capacity?
A. Substance A
B. Substance B
Letter A because the temperature of a substance A increases "Twice as much".
determine the velocity of a cart traveling at 135cm in 5.5s.
Answer: 0.245 m/s
Explanation:
So velocity = d/t or distance over time in this case m/s or meters per second. But BE CAREFUL you must remember to convert cm to m always so 135 cm= 1.35m and 1.35m/5.5s= 0.245m/s
When electrons lost a blank ion is formed
When electrons are gained a blank ion is formed
Answer:
I love it
Explanation:
☁️ Answer ☁️
annyeonghaseyo!
Your answer is:
When electrons are lost, a positively charged ion is formed. When electrons are gained, a negatively charged ion is formed. (I like the car)
Hope it helps.
Have a nice day noona/hyung!~ ￣▽￣❤️
How many copies of DNA do haploid cells have
Answer:
2 lol
Explanation:
Why does a DNA fingerprint require millions of copies of each DNA fragment
Answer:
Because it can identify a person.
A DNA fingerprint is a piece of DNA so distinct that it can prove a person's identity. These distinct areas can take on many different forms, but each form is unique to any one individual.
PCR allows the amplification of a single copy of DNA into millions of copies. However this technique requires that the DNA of interest already be of a known sequence in order to design primers that will specifically hybridize to the target DNA.
It is important as:
It's used as evidence in courts, to identify bodies, track down blood relatives, and to look for cures for disease.
Learn more:
brainly.com/question/13695548
what is phase change?
Explanation:
In chemistry, thermodynamics, and many other related fields, phase transitions (or phase changes) are the physical processes of transition between the basic states of matter: solid, liquid, and gas, as well as plasma in rare cases.
Answer:
In chemistry, thermodynamics, and many other related fields, phase transitions are the physical processes of transition between the basic states of matter: solid, liquid, and gas, as well as plasma in rare cases. A phase of a thermodynamic system and the states of matter have uniform physical properties.
Explanation:
What are resistors? please help
Answer:Resistor Basics
Resistors are electronic components which have a specific, never-changing electrical resistance. The resistor's resistance limits the flow of electrons through a circuit.
They are passive components, meaning they only consume power (and can't generate it). Resistors are usually added to circuits where they complement active components like op-amps, microcontrollers, and other integrated circuits. Commonly resistors are used to limit current, divide voltages, and pull-up I/O lines.
Resistor units
The electrical resistance of a resistor is measured in ohms. The symbol for an ohm is the greek capital-omega: Ω. The (somewhat roundabout) definition of 1Ω is the resistance between two points where 1 volt (1V) of applied potential energy will push 1 ampere (1A) of current.
As SI units go, larger or smaller values of ohms can be matched with a prefix like kilo-, mega-, or giga-, to make large values easier to read. It's very common to see resistors in the kilohm (kΩ) and megaohm (MΩ) range (much less common to see miliohm (mΩ) resistors). For example, a 4,700Ω resistor is equivalent to a 4.7kΩ resistor, and a 5,600,000Ω resistor can be written as 5,600kΩ or (more commonly as) 5.6MΩ.
Schematic symbol
All resistors have two terminals, one connection on each end of the resistor. When modeled on a schematic, a resistor will show up as one of these two symbols:
Resistor schematic symbols
Two common resistor schematic symbols. R1 is an American-style 1kΩ resistor, and R2 is an international-style 47kΩ resistor.
The terminals of the resistor are each of the lines extending from the squiggle (or rectangle). Those are what connect to the rest of the circuit.
The resistor circuit symbols are usually enhanced with both a resistance value and a name. The value, displayed in ohms, is obviously critical for both evaluating and actually constructing the circuit. The name of the resistor is usually an R preceding a number. Each resistor in a circuit should have a unique name/number. For example, here's a few resistors in action on a 555 timer circuit:
Answer: resistor is
Explanation:
A resistor controls the flow of the electrical current within a circuit. Resistors are made from materials like copper or carbon, which make it difficult for the electrical charges to flow through a circuit. The most common type of resistor is a carbon resistor, which is a general purpose resistor, best suited for lower-powered circuits.
Living organisms contain a variety of specailsed cells name one example of a specialised cell in the body and state its function example : function :
Answer:
See the answer below
Explanation:
The cell represents the basic unit of life and any living organism.
One example of specialized cells in the body are the sex cells.
The sex cells are primarily concerned with reproduction and perpetuation of life. The cells undergo meiosis to produce haploid gametes. Male and female gametes then fuse together during fertilization to give rise to diploid zygotes which eventually give rise to new organisms.
Which of the following elements is the most reactive?
A. Ba
B. Cs
C. Hf
D. Lu
Answer: Cs because its further to the right on the table, meaning its more reactive.
Explanation:
Answer:
Cs
Explanation:
This element is the farthest right, and lowest meaning that its reactivity is very high.
1. valence electrons and electronegativity
2. Both reactivity and electronegativity decrease down a group.
3. Electronegativity decreases down a group and reactivity increases down a group.
4. The number of valence electrons increases from left to right.
5. Cs
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Analyzing models compare an atom’s structure to a ladder. Identify one way in which ladder is not a good model from the atom.
Answer:
Climbing a ladder assumes that you would touch/use each step only once. Electrons will take one layer that is empty first, and previous layers or "steps" will continue being filled with additional electrons only when every other layer is occupied by, at least, one electron.
Explanation:
A good analogy is what passengers in a bus do. Everyone tries to sit alone first and only when every pair of seats has a person already seated, people will use them as well, sitting next to each other.
The number of ions produced when a substance dissolves is always equal to the number of Adams in a chemical formula. What is incorrect about following statement?
list the factor on which Ka of a weak acid depends
What element is in group 4 and period 3
Students report that the sky in their area has mostly cirrus clouds. What are most likely the weather conditions in the area?
rainy weather
dark, overcast (blocking the sunlight)
stormy weather
fair, pleasant weather
Am I doing this right?
What is [OH-] of a solution
with a pH of 4.0?
Answer in M
An object was measured by a worker as 35.6 cm long, however, the manufacturer specifications list the length of the object at 35.0 cm. What is the percent error in the workers measurement?
How do we know if molecules have kinetic energy?
3. How does genetic variation allow humans to survive long-term? Which
type of reproduction is responsible for genetic variation?
Answer:
more genetic variation within a population usually enables more phenotypic variation.
Explanation:
Because natural selection acts directly only on phenotypes, Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.
Genetic variation lets the organisms survive long term as it increases the phenotypic and the genotypic variation. Genetic variation is due to the type of reproduction that involves two parents.
What is genetic variation?Genetic variation is the modification of the original genome of the organism by genetic recombination and mutation that can be beneficial in the survival and the natural selection process.
Reproduction involving two parents of the same species allow genetic variation as the process of independent assortment and crossing over of the chromosomes inherited from both creates species with different traits and genotype.
Therefore, the reproduction involving two parents results in genetic variation.
Learn more about genetic variation here:
https://brainly.com/question/20665733
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A woman uses 330 Joules of energy to push a box across the floor in 33 seconds. What is her power output in Watts?
Answer:
10 watts
Explanation:
Power = Work / Time
Power = 330 J / 33 s
Power = 10 watts
What happens when a chemical reaction reaches equilibrium
Which of the following describes wind direction?
Wind direction is reported by the direction from which it originates. For example, a north or northerly wind blows from the north to the south. Wind direction is usually reported in cardinal (or compass) direction, or in degrees.
complete the bolded items in each box below
Show the bolded items and the boxes.
Gas in a balloon occupies 3.3 liters. What volume will it occupy if the pressure is changed from 100 kPa to 90.0 kPa, if the temperature is held constant?
Answer:
3.7 L
Explanation:
Initial volume (V₁) = 3.3 L
Initial pressure (P₁) = 100 KPa
Final pressure (P₂) = 90 KPa
Final volume (V₂) =?
The final volume of the gas can be obtained by using the Boyle's law equation as follow:
P₁V₁ = P₂V₂
100 × 3.3 = 90 × V₂
330 = 90 × V₂
Divide both side by 90
V₂ = 330 / 90
V₂ = 3.7 L
Thus, the final volume of the gas is 3.7 L
1. The chemical formula of caffeine is C8H10N4O2. Determine the percent composition of the molecule.
Show work please
Answer:
we find the mass for each element in one mole by multiplying the number of atoms in one molecule with the atomic mass
mC=8Ac=8*12=96g
mH=10AH=10*1=10g
mN=4AN=4*14=56g
mO=2AO=2*16=32g
by adding the masses together we find the molar mass of the molecule
M=mC+nH+mN+mO=96+10+56+32=194g/mole
we apply the rule of threes to find the percentage of each element
194g..96gC..10gH...56gN....32gO
100g....a...........b...........c.............d
a=(100*96)/194=49.48%C
b=(100*10)/194=5.19%H
c=(100*56)/194=28.85%N
d=(100*32)/194=16.48%O
Explanation: