Answer:
Dry ice is colder than the usual ice made from frozen water. It is frozen carbon dioxide gas at a temperature of -109.3°F or -78.5° C or colder, compared with water ice at 32°F or 0° C or colder. Because it is colder to begin with, it should be more effective at keeping your ice chest cold.
Answer:
dry ice usually are colder than regular it could go down to 20 below zero that is why it feels like dry but it is because les humidity there is and while regular ice is mostly of 0
Explanation:
The mass of a 5 mL sample of ethanol is 15.2 grams, what is the density?
Work Shown:
density = mass/volume
d = (15.2 grams)/(5 mL)
d = (15.2/5) grams per mL
d = 3.04 grams per mL
This is the same as writing 3.04 g/mL
What is the function of a cell wall
(A) to protect and support the cell
(B) to perform different functions in each cell
(C) to prevent water from passing through the cell
(D) to prevent oxygen from entering the cell
Answer:
the answer is A to protect and support the cell
Answer:
A)
Explanation:
When a runner participates in a marathon, they travel a distance of 26.2 miles. How many kilometers is
this?
Answer:
Around 42.2 Km
Explanation:
WOULD YOU CONSIDER WATER AND OZONE TO BE MOLECULES ?
Answer:
yes
Explanation:
Water contains molecular bonds and because it is made from more than one element and they are oxygen and hydrogen.
ozone would be considered a molecule because it has three oxygen atoms formed together and is 21% of the gases found on earth
which statement is an example of an observation a scientist would make to clarify a rock.
A, a rock is larger than other rock.
b. A rock was found in a stream.
c, A rock is formed from molten lava.
b. A rock cracks in half after a rainstorm.
Answer: A
Explanation: Geologists classify rocks by looking at their chemical and mineralogical composition then at the the size and shape of their component minerals then at any texture.
4) A metal cylinder is placed in a graduated cylinder which has been filled with
water to the 80.0 mL mark. The water level rises to the 88.0 mL mark.
(a) What is the volume of the metal cylinder?
3
(b) The cylinder has a density of 3.21 g/cm^3. What is its mass?
Explanation:
(a).volume = final volume of water - initial volume of water
Volume of metal cylinder = 88 - 80
We have the answer as
8.0 mL(b).The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 8 mL
density = 3.21 g/mL
So we have
mass = 3.21 × 8
We have the answer as
25.68 gHope this helps you
How much energy (in kcal) is involved when 5.2 g of water at 0.0oC is converted to ice? Enter only the numeric value for your answer (no units).
Answer:
[tex]Q=0.41kcal[/tex]
Explanation:
Hello.
In this case, since the energy involved during this process is associated to the freezing enthalpy of water at the freezing point of water (0.0 °C) and is computed via:
[tex]Q=m\Delta _{freezing}H[/tex]
It is known that the freezing enthalpy of water is -333.3 J/g, therefore, the involved heat is:
[tex]Q=5.2g*-333.33\frac{J}{g}\\ \\Q=-1733.33J[/tex]
Clearly, it is negative since freezing requires the removal of energy, which means it is negative based on the first law of thermodynamics. Finally, the energy in kcal turns out:
[tex]Q=1733.33J*\frac{1kcal}{4184kJ}\\ \\Q=0.41kcal[/tex]
Regards.
Which choice below is not an example of a limiting factor:
Money
Space
Predators
Nutrients
Sunlight
HELP NOW!!!!!! When you put water into a hot metal pan of equal mass, why does the pan cool down more than the water heats up?
Answer:
Because the specific heat of the metal is less than the specific heat of water.
Explanation:
Hello, happy to help you today!
In this case, we need to analyze a property called "specific heat" which accounts for how much energy is required to increase or decrease the temperature of 1 g of the substance by 1 °C.
In this case, since the specific heat of water is about 4.184 J/g°C and the specific heat of metals in general is greater than zero, of course, but less than one, we can infer that for the same amount of energy, when they are in contact, more grams of metal will be cooled down to those of water heated up, because the specific heat of the metal is less than the specific heat of water.
Best regards!.
the atomic number of an element is......
Answer:
the number of protons in the nucleus of an atom.
Explanation:
cause they are the same no matter what.
1 point
A 2.00 kg cart on a frictionless track is pulled by force of 3.00 N. What is
the acceleration of the cart?
1.5 m/s/s
O 3 m/s/s
6 m/s/s
.66 m/s/s
Answer:
The answer is 1.5 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]acceleration = \frac{force}{mass} \\ [/tex]
From the question
force = 3 N
mass = 2 kg
The acceleration is
[tex]acceleration = \frac{3}{2} \\ [/tex]
We have the final answer as
1.5 m/s²Hope this helps you
HELP!! I NEED AN ANSWER!!
Why does an iron gate have the same properties as an iron frying pan?
O both are black
O both are non-mental
O both are magnetic
O both are made of the same type of atoms.
Balancing Redox Reactions
VO2++MnO4 V(OH)4++Mn2+(acidic)
Answer:
MnO4- + 5 VO +2 + 11 H2O = 5 V(OH)4+ + Mn+2 + 2 H+
Explanation:
The balanced redox reaction is MnO⁴⁻ + 5 VO⁺² + 11 H₂O = 5 V(OH)⁴⁺ + Mn+2 + 2 H⁺.
What are redox reactions?Redox reactions are those reactions in which there is the transfer of electrons between different elements. These reactions are of two types, oxidation and reduction reactions. Examples are combustion, displacements, corrosion, and rusting reactions.
An example of a chemical reaction in which one or more electrons are lost is an oxidation reaction.
A reduction reaction is one in which one or more electrons are acquired during a certain kind of chemical reaction.
The formation of hydrogen fluoride is a redox reaction.
H₂ + F₂ = 2HF
H₂ = 2H + 2e⁻
F₂ + e⁻ = 2F⁻
Thus, the reaction is MnO⁴⁻ + 5 VO⁺² + 11 H₂O = 5 V(OH)⁴⁺ + Mn+2 + 2 H⁺.
To learn more about redox reactions, refer to the link:
https://brainly.com/question/13293425
#SPJ2
A group of students is investigating how a force applied to an object affects the motion of that object. The diagram shows the setup for the investigation. To create a force, the students add a weight to the weight holder and observe whether the cart moves. The students repeat this step five times, using a different amount of weight each time. Identify the independent and dependent variables of this investigation.
Answer:
87 is the wight of the hight
Explanation:
What is the chemical symbol for 1s^22s^22p^6
Answer:
The chemical symbol of given electronic configuration is Ne.
Explanation:
First of all we will calculate the total number of electron from this electronic configuration:
1s² 2s² 2p⁶ = 2+2+6 = 10
we know that the number of electron of an atom shows its atomic number. The total number of electron in given electronic configuration are 10.
Now from periodic table we got to know that neon has atomic number of 10.
Thus the given electronic configuration is of neon atom.
Neon is belongs to noble gas family.
All noble gases have complete octet.
These are inert gases.
what is the affect of neutrons on atoms
Answer:
It's better to explain it.
Explanation:
Neutrons do not affect the electron configuration, but the sum of atomic number and the number of neutrons, or neutron number, is the mass of the nucleus. You know that neutrons are found in the nucleus of an atom. Under normal conditions, protons and neutrons stick together in the nucleus. During radioactive decay, they may be knocked out of there. Neutron numbers are able to change the mass of atoms, because they weigh about as much as a proton and electron together. if your asking What is the role of a neutron in an atom? then, Neutrons are very important in providing stability for an atom. Some atoms don't "need" neutrons - The hydrogen atom does not have any neutrons. However, as the atomic number ( # of protons ) increases, the number of neutrons increases as well.
Protons don't like each other. Naturally, 'positive charges repel', so it wouldn't be possible to have more than one proton in the nucleus. Here's where the neutron comes in.
Hope this helps. :)
A ballon has a volume of 5.6L at 25C and it is placed into liquid nitrogen at a temp of -78c. what is the volume of the ballon
Answer:
3.7L
Explanation:
Given parameters:
Initial volume = 5.6L
Initial temperature = 25°C = 273 + 25 = 298K
Final temperature = -78°C = 273 + (-78) = 195K
Unknown:
New volume of the balloon = ?
Solution:
We are going to assume that the pressure is constant and then we apply the charles's law;
"the volume of fixed mass of a gas varies directly as its absolute temperature if its pressure is constant"
mathematically;
[tex]\frac{V_{1} }{T_{1} }[/tex] = [tex]\frac{V_{2} }{T_{2} }[/tex]
Where V and T are temperature
1 and 2 are initial and final states
Insert the parameters and solve;
[tex]\frac{5.6}{298}[/tex] = [tex]\frac{V_{2} }{195}[/tex]
298V₂ = 1092
V₂ = 3.7L
Which of the following should be measured with a meter stick, not a tape measure?
A.
the length of ribbon needed to tie around a vase
B.
the size of a student's waist
C.
the distance from the ground to the top of a ramp
D.
the circumference of an orange
Answer:
C
the distance from the ground to the top of a ramp
Convert 29.85 degree Celsius to Kelvin
Answer:
its 303 Kelvin. (typing this for characters)
Please help my last question thank you if u did answer it
Answer:
I don't know sorry I hope you find what you're looking for
Answer:
I think the answer is G
Explanation:
Carbon atom has 6 electrons 6 protons and 6 neutrons.(electron =negetive) (proton=positive) (neutron=neutral)
You should know protons and neutrons are in nucleus of atom and electrons surround them.I think you understand.
Is coffee and water heterogeneous or homogeneous?
Answer:
coffee is a homogeneous mixture while water is a heterogeneous mixture
Which of the following best describes the function of vacuoles?
O
Transferring energy throughout all kinds of cells
O
Storing materials in plant cells
Digesting food in animal cells
O
Protecting cells from the environment
They mainly store materials for other cells to use.
C10H20 is an organic compound. Calculate its molar mass to 2 decimal spaces.
Answer:
140.3 g/mol
Explanation:
Step 1: Define
Molar Mass C - 12.01 g/mol
Molar Mass H - 1.01 g/mol
Step 2: Multiply values
10(Molar Mass C) + 20(Molar Mass H)
10(12.01 g/mol) + 20(1.01 g/mol)
120.1 g/mol + 20.2 g/mol
140.3 g/mol
Express in scientific notation:
780000
Answer:
7.8 x 10^5
Explanation:
So in scientific notation the number has to be less then 10 and greater then 1 so in this case it would be 7.8 and the number of 0 moved 10^x power would be the number which in this case it’s 5 times so 10^5. multiply the two numbers and that’s scientific notation.
“Zn” is a...
Chemicals Formula
Symbol
Name
Explanation:
Zn is a symbol
its name is zinc
i need help with question 1 please
Answer:86
Explanation: to find atomic mass you take the number of protons and the number of neutrons. therefore you take the 40 protons and the 46 neutrons to find the mass. :)
Answer:
86
Explanation:
To find the answer i added the proton and neuron
MnS+HCl H 2 S+MnCl 2 Which set of coefficients would balance the equation?
Answer:
1,2,1,1
Explanation:
If a package of nuts weighs 41.3 what is the massif package express in milligram
Answer:
1170855 mg
Explanation:
A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 21.0cm wide and 25.2cm high. The maximum safe pressure inside the vessel has been measured to be 4.00MPa. For a certain reaction the vessel may contain up to 0.474kg of boron trifluoride gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Be sure your answer has the correct number of significant digits.
Answer:
Explanation:
Volume of cylinder = πr²h where r is radius of cylinder, h is height of cylinder
r = d/2 = 21/2 = 10.5 cm; h = 25.2 cm
volume of cylinder = (22 * 10.5 cm * 10.5 cm * 25.2 cm) / 7
volume = 8731.8 cm³ = 8.7318 L
Using the ideal gas equation, PV = nRT
P = 4.00 MPa = 4.0 * 10³ kPa, V = 8.7318 L, R = 8.314 L.kPa/mol.K,
n = mass / molar mass
where mass = 0.474 kg or 474 g, molar mass of BF₃= 68 g/mol
n = 474 g / 68 g/mol = 6.9706 moles
making T subject of formula in the ideal gas equation;
T = PV/nR
T = (4.0 * 10³ kPa * 8.7318 L)/(6.9706 mol * 8.314 L.kPa/mol.K)
T = 602.675 K
T in °C = K - 273.15
T = 602.675 -273.15 = 329.5 °C
T = 330 °C
Question 1 (1 point)
An)
is when someone forms a conclusion right after making an observation
Blank 1:
Question 2 (1 point)
is an educated guess
Blank 1:
Question 3 (1 point)
If I am doing an experiment over and over again of MY own investigation for accuracy then it's called
Blank 1:
Question 41 point)
If someone else is replicating an investigation then it is called
Blank 1:
Meeting in "
Question 51 point
Something I change in an experiment is called
Answer:
i need help on this too.
Explanation:
