Answer:
The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.
Explanation:
Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.
The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.
The sensible heat in a constant pressure is calculated by:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)
In this case:
Q= 300 Jc= 0.46 [tex]\frac{J}{g*C}[/tex]m= ?Tfinal= 40 CTinitial= 20 CReplacing:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* (40 - 20) C
Solving:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* 20 C
[tex]m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}[/tex]
m= 32.61 g
Why would early Earth have been toxic for modern day animals? Why were cyanobacteria able to
survive
Answer: The surface of early earth was mostly molten and volcanic. The atmosphere was hot and highly toxic.
Explanation: Photosynthetic organisms were present when earth was primarily anoxic. photosynthetic organisms were present when earth was primarily anoxic. the early forms of photosynthesis did not produce oxygen as a waste product. cyanobacteria carry out anoxic photosynthesis. the early forms of photosynthesis did produce oxygen, but it was not enough to make a difference in the atmosphere. the early forms of photosynthesis were carried out in the water, and there was no way for the oxygen to move into the atmosphere.
1
Early earth have been toxic for modern day animals as at that time atmosphere is oxygen free, and cyanobacteris is able to survive due to symbiosis.
What are cyanobacterias?
Cyanobacteria is a group of microorganisms that are related to bacteria but can perform photosynthesis. They are prokaryotic and are thought to be the earliest form of life on the planet.
Early earth atmosphere may proof toxic for modern day animals because at the earliest time, atmosphere is oxygen free means no oxygen is present in the atmosphere. And in the today scenario we can't imagine life without oxygen.
Cyanobacteria were able to suvive in that early atmosphere through alternative option like symbiosis in which a cell merges with another cell in order to the survival of both cells.
Hence life is toxic at the early time because of the absence of oxygen.
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What is the noble gas notation For zinc
Answer:
The noble gas notation for zinc would be [Ar]3d^104s^2
Explanation:
I hope this helps you:) let me know if it does make sense, okay?
I need y’all helping me with this question?
What is a key difference between chemical and nuclear reactions?
A. In chemical reactions, new compounds are formed. In nuclear reactions, compounds are destroyed.
B. Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.
C. Chemical reactions involve large changes in energy. Nuclear reactions absorb or release small amounts of energy.
D. In chemical reactions, only alpha radiation is emitted. In nuclear reactions, alpha, beta, and gamma decay may occur.
Answer:
B
Explanation:
Chemical reactions involve electron rearrangements. Nuclear reactions involve changes to the nucleus.
Answer:
B
Explanation:
If 2a=3b and a=6 then b=
then b is 4
2a=3b since a=6
2x6=3b
12=3b
b=12/3
b=4
Answer:
b=4
Explanation:
2a=3b
2a=2*6
2*6=12
2a=12
12=3b
12/3=4
b=4
What is it known as
Answer:
Some of the most incredible discoveries in science were made because the data looked wrong! Once you have the data, you may need to perform a mathematical analysis to support or refute your hypothesis. Conclusion Conclude whether to accept or reject your hypothesis. There is no right or wrong outcome to an experiment, so either result is fine.
___KClO3--->___KCl+___O2 I need help bro.
What happens to the sound wave in echolocation?
Olt releases energy
O It is reflected
O It is refracted
O It is absorbed
Answer:
D
Explanation:
Electronic configuration of 11N
Answer:
The Electronic configuration of 11N is
[Ne]3s1
The data were collected over five spring seasons. What is the difference between the number of frogs in the pond when the rainfall was 5 cm and when the rainfall was 20 cm?
Please help
Answer: they like deep water
Explanation: they do
The Sun-Earth-Moon system can be modeled by using three balls. Which
statement describes a benefit of this model?
O A. It can be easily manipulated to represent changes that occur
slowly.
O B. All parts of the entire solar system can be modeled in the same
way.
O C. The model shows only how moon phases happen.
O D. The actual Sun-Earth-Moon system moves too quickly to be
studied directly.
Answer:
A. it can be easily manipulated to represent changes that occur slowly.
- At sea level, water boils at 100°C. This is an example of an)
a chemical property.
c. physical property.
b. extensive property.
d. chemical change.
Answer:
d
Explanation:
The measurement of boiling point is a physical property it involves only physical changes and not any chemical change. Hence, option c is correct.
What is physical properties?Physical properties of a substance include properties such as boiling point, melting point, density, mass, solubility etc. These are all characterised with a change in physical state of the substance and not any chemical reactions.
Boiling point of a substance is the temperature at which the substance converts from its liquid state to vapor state where the vapor pressure of the gas phase above the liquid is equal to the atmospheric pressure.
Boiling of a substance does not involve any making or breaking of chemical bonds and not producing a new compound. Therefore, boiling point is a physical property.
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Which statement about melting and boiling points is true? Question 3 options:
A. As you move down group 7A in the periodic table, the melting and boiling points of the elements decrease.
B. As you move up group 8A in the periodic table, the melting and boiling points of the elements increase
. C. Smaller atoms in group 8A require higher boiling points for the molecules to separate from each other than larger atoms in group 8A.
D. Larger atoms in group 8A require higher boiling points for the molecules to separate from each other than smaller atoms in group 8A.
Answer:
B
Explanation:
I believe it is B but I am not entirely sure! don't do this is B doesn't sound or look right to you!
Answer:
Its D
Explanation:
Larger atoms in group 8A require higher boiling points for the molecules to separate from each other than smaller atoms in group 8A.
Which of these outcomes is conclusive evidence that mixing sugar in water is a physical change?
OA. There is no change in color.
OB. There is no precipitate formed.
OC. There is no gas given off.
OD. There is no molecular change,
Explanation:
Physical change can observe by physical appearance
OA = No change in color
other choices are chemistry change
is the study of matter and energy ,and the interactions between the two through forces and motion
The study of matter and energy ,and the interactions between the two is through forces and motion which is a part of physics.
What is motion?Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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What is the mass, in grams, of a 12.0cm³ sample of aluminum? The density of aluminum is 2.70g/cm³
Answer:
The answer is
32.4 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of aluminum = 12 cm³
Density = 2.70 g/cm³
The mass of aluminum is
mass = 2.7 × 12
We have the final answer as
32.4 gHope this helps you
5(3x) - 7y2=?, when x = 3 and y= 2
Answer:
This might help u......
A science student wants to use distillation to separate a mixture of two
substances in the liquid state. For the student to be successful, which property
should be significantly different between the two liquids?
h-
ies
h-
Freezing point
Ability to dissolve a solid substance, such as table sugar
1
Ability to react with oxygen
O Boiling point
et
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Next
Answer:
Boiling point
Explanation:
Distillation is one of the most widely used separation technique in chemistry. It is used to separate a mixture of liquid substances with different boiling point. Hence, the basis of the separation is BOILING POINT DIFFERENCE.
In the procedure, the liquid substances are heated until they turn gaseous, which they do at different times considering their different boiling points. The separated components are then converted back to liquid states in a process called CONDENSATION.
what type of battery still uses lead?
Answer:
Starter batteries
Explanation:
What is the difference between bulk and particle scale?
Someone please help!!
Answer:
Particle density is the volumetric mass of the solid soil. It differs from bulk density because the volume used does not include pore spaces. Particle density represents the average density of all the minerals composing the soil.
Hope that helps
convert 500 inches to m.
1000mm =1m
1inch = 2.54 cm
10mm=1cm
Answer:
12.7m
Explanation:
FORMULA
for an approximate result, divide the length value by 39.370078
Thomson's model suggested that electrons were mixed into the sphere of an atom much like raisins ?
a pencil is 7 in Long what is its length in centimeters
look the following picture i think that will help you too find out answer
Explain how you would test the presence of oxygen and hydrogen gases.
Which of the following is an example of using creativity while doing background research?
Organizing data in tables
Validating results by repetition
Drawing a conclusion
Writing a hypothesis
Answer:
B
Explanation:
Answer:
D. Writing a hypothesis
Explanation:
On August 4, 2020, an explosion estimated at 1.2 kilotons of TNT (dynamite) destroyed
a port in Beirut, Lebanon. The sound from the explosion travelled at 767 mph (the speed
of sound). How long, in seconds, did it take for the sound to travel 50 km?
Answer:
it will take that explosin 15.34 millisecond
Explanation:
as the speed is 767 and distance is 50 so time will be 767/50=15.34milliseconds
Why was there no increase in the reaction rate with 8 g of substrate as compared to 4 g of substrate?
Answer:
Equilibrium over-saturated
Explanation:
In both were excessively-saturated in volume equilibrium and much more molecules would be required to see a growth in reaction rate.
So, we can say that there was no increase in reaction rate.
You are throwing a pizza party for 15 people and figure that each person will eat 4 slices. You call the pizza place and learn that each pizza will cost you $14.75 and it will be cut into 12 slices. How much is the pizza for this party going to cost you? Give the answer to the nearest cent.
Answer:
15 people x 4 slices so you’ll need 60 pieces
60/12(the amount of slices per pizza) =5
You need 5 pizzas. $14.78 x 5 = 73.90.
Explanation:
the answer is that one 73.90 is rounded nearest cent : ) took me a while to get it
Answer:
the cost of pizza for 15 people is $73.9
Explanation:
a pizza party for 15 and each person will eat 4 slices.
meaning the 15 people will eat 4 x 15 = 60 slices
Since each pizza will cost you $14.78 and will be cut into 12 slices.
`1 pizza = 12 slices = $ 14.78
60 slices = (14.78 x 60) / 12 = 886.8 /12 = $73.9the cost of pizza for 15 people is $73.9
how is matter and energy conserved when liquid is frozen
Answer:
The big energy change when water freezes is in the potential energy of interactions between the water molecules.
Explanation:
I am not to sure if this is correct, but I hope it helps in some way.
which part of a plant conducts food and water to different part of it?
Answer:
stem is the correct answer
Explanation:
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