Answer:
Answer is A.
Explanation:
which element has the largest atomic radii in the 3rd period of the periodic table?
Answer:
Sodium (Na)
Explanation:
after felix adds salt to the boiling water what will he have in the pot
Answer:
Salty water
Explanation:
Sorry for wasting your time.
A lead ball has a mass of 5.910 g and a diameter of 10.0 mm. What is the density of lead in grams per cubic centimeter
Answer:
Explanation:
The formula is density = mass÷volume
Values given are:
mass = 5.910g and
diameter = 10.0 mm = 1cm
so, we need to find the volume first.
Volume of a sphere is (4/3)πr³
thus, V = 4.189 cm³
Density = mass ÷ volume
density = 5.910 ÷ 4.189
= 1.411 g/cm³
As the vibration of molecules increases, the _____ of the substance increases.
temperature
internal energy
kinetic energy
all of the above
Answer:
Answer option D- all of the above
Suppose you mix Na2SO4 and KCl solutions according to the given equation.
Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq)
What evidence of a reaction do you expect to see?
Select one:
A precipitate should form.
A gas should form.
Water should form.
Ο Ο
No reaction should occur.
Answer:
No reaction should occur
Explanation:
Water cannnot be made from the components
Nothing will be released as a gas
Both products are soluible in water therefore will not form a precipitate.
If I mix a solution of Na2SO4 and KCl, no reaction should occur.
Whether or not, a reaction occurs when two substances are mixed depends on the respective positions of the substances in the electrochemical series.
Now, we are expecting the reaction; Na2SO4 (aq) + 2 KCl(aq) + 2 NaCl(aq) + K2SO4 (aq) to occur. The big question is, between sodium and potassium, which is higher in the electrochemical series?
A little look into the image attached shows that potassium is higher than sodium in the series so the reaction is possible.
However, the both products are aqueous, they are both soluble in water hence no visible reaction occurs.
Learn more: https://brainly.com/question/24058474
How many valence electrons would be used in drawing the Lewis Structure CF4?
Answer:
32
Explanation:
You have 7 valance electrons in fluorine, and you have 4 of them. 7*4=28. Then, you have 4 valance electrons on carbon. So 28+4=32
Modeling Nuclear changes
Answer:
can someone please do this and put the answers below !!!!
Explanation:
Cold-winter survival experts do not recommend eating snow for hydration. One reason for this is the energy it takes to increase temperature of the snow, melt it, and then increase the temperature of the resulting water to body temperature. Calculate the total amount of heat to convert 2.000 kg of snow at -15.00 0C to liquid water at 38.00 0C.
POTENTIALLY HELPFUL INFORMATION:
The heat of fusion for water is 1.44 kcal/mol.
The specific heat capacity of solid water is 0.488 cal/g0C.
The specific heat capacity of liquid water is 1.00 cal/g0C.
The freezing point of water is 00C (also known as melting point).
Answer:
The total amount of heat is 250.64 kcal.
Explanation:
Given that,
Total amount of heat = 2.000 kg
Temperature of snow = -15.00°C
Temperature of water = 38.00°C
Heat of fusion of water = 1.44 kcal/mol
Specific heat of solid water = 0.488 cal/g°C
Specific heat of liquid = 1.00 cal/g°C
We need to calculate the heat required to bring temperature -15°C to 0°C snow
Using formula of heat
[tex]Q_{1}=mc_{p}\Delta T[/tex]
Put the value into the formula
[tex]Q_{1}=2000\times0.488\times(0+15)[/tex]
[tex]Q_{1}=14640\ cal[/tex]
[tex]Q_{1}=14.640\ kcal[/tex]
We need to calculate the heat required to convert 0°C snow into 0°C water
Using formula of heat
[tex]Q_{2}=ml[/tex]
Put the value into the formula
[tex]Q_{2}=\dfrac{2000}{18}\times1.44[/tex]
[tex]Q_{2}=160\ kcal[/tex]
We need to calculate heat required to increases temperature of water from 0°C to 38°C
Using formula of heat
[tex]Q_{3}=mc_{p}\Delta T[/tex]
Put the value into the formula
[tex]Q_{3}=2000\times1.00\times(38-0)[/tex]
[tex]Q_{3}=76000\ cal[/tex]
[tex]Q_{3}=76\ kcal[/tex]
We need to calculate the total heat
Using all heat amount
[tex]Q=Q_{1}+Q_{2}+Q_{3}[/tex]
Put the value into the formula
[tex]Q=14.640+160+76[/tex]
[tex]Q=250.64\ kcal[/tex]
Hence, The total amount of heat is 250.64 kcal.
How can the total energy of an open system be changed? Enter your answer in the space provided.
yes they can be changed becasue they are expose to the environment
That's why it's improtant to have a calorimeter so the energy and heat are contained
The total energy of an open system be changed if:
There is an exchange between matter and energyAccording to the First Law of Thermodynamics, energy cannot be created or destroyed, it can only change form.
An open system is a system that has an interaction with its environment where matter or energy can be added or removed from the environment.
As a result of this, the total energy of an open system can be changed if there is an exchange between matter and energy and they remain constant.
Therefore, the correct answer is an exchange has to take place for the total energy in an open system to be changed.
Read more here:
https://brainly.com/question/20319024
What is the density if the mass is 25 g and the volume is 114 mL?
Answer:
0.219 g/mL.
Explanation:
From the question given above, the following data were obtained:
Mass = 25 g
Volume = 114 mL
Density =.....?
Density of a substance is simply defined as the mass of the substance per unit volume of the substance. Mathematically, it is expressed as:
Density = mass /volume
With the above formula, we can obtain the density of the substance given in the question above as follow:
Mass = 25 g
Volume = 114 mL
Density =.....?
Density = mass /volume
Density = 25/114
Density = 0.219 g/mL
Therefore, the density of the substance is 0.219 g/mL
What is the mass of 6.2x 1022 molecules of carbon monoxide?
Answer:
Mass = 2.8 g
Explanation:
Given data:
Number of molecules of CO = 6.2×10²²
Mass of CO = ?
Solution:
We will use Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.
The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
For given 6.2×10²² molecules of CO mass will be,
1 mole = 6.022 × 10²³ molecules of CO
6.2×10²² molecule × 1 mole/ 6.022 × 10²³ molecules of CO
0.1 mol
Mass of CO:
Mass = number of moles × molar mass
Mass = 0.1 mol × 28 g/mol
Mass = 2.8 g
Which molecule would have this shape?
Answer:
CO2
Explanation:
the subscript tells you how many of one element is used for this case there is one black atom and 2 red ones so you only need 1 carbon and 2 oxygens.
hope this helps. brainliest please?
How do changes in population size relate to environmental conditions?
Answer:
No simple relationship exists between population size and environmental change. However, as global population continues to grow, limits on such global resources as arable land, potable water, forests, and fisheries have come into sharper focus.
Explanation:
Forecasting the weather for a specific area is relatively easy because of all the technology that is available.
A. True
B. False
Answer:
A
Explanation:
PLEASE HELP ASAP! WILL MARK YOU AS BRAINLIEST!!!
Answer:
what are the options?
Explanation:
The table lists some compounds found in foods and their formulas.
Based on this information, which of these statements is NOT true?
CLEAR
Answer:
A
Explanation:
the number of molecule won't be twice as fructose has 12 hydrogen molecules and lactose has 22 hydrogen molecules
From the given statements, the statement saying that the number of atoms in Lactose is twice the number of atoms in Fructose is not correct. Thus option A is correct.
The given molecules in the list are Glutamine, Lactose, fructose, and Sorbitol.
The number of atoms in the following compounds is:
Glutamine = 20 atomsLactose = 45 atomsFructose = 24 atomsSorbitol = 26 atoms.Statement A says that the number of atoms in Lactose is twice the number of atoms in Fructose. The twice atoms of Fructose are 48 atoms. The number of atoms of lactose is 45.
Thus statement A is incorrect. Thus option A is correct.
For more about the atoms in a molecule, refer to the link:
https://brainly.com/question/25617532
Which process occurs in a fission nuclear reactor?
Nuclei combine.
Nuclei split apart.
Neutrons combine.
Neutrons split apart.
Answer:
Nuclear fission/ split apart
Explanation:The process of splitting a nucleus is called nuclear fission and is used in nuclear power reactors. Fission is another word for splitting.
Hope this helps! brainlyeast would only be necessary if this helped you thanks! :) have a good day!
Answer:
The correct answer is B. Nuclei split apart
Explanation:
EDGE2022
Hope is testing a substance using blue litmus paper. The paper turns red. The substance is _____.
a neutral
an acid
a base
Answer:
the substance is an acid
are all physical reactions reversible?
A) No, while some such as freezing are, others, such as breaking glass aren't.
B) Yes, every single one of them are!
Answer: answer is A
Explanation:
what is the difference between luster and dull
Luster means Shiny. Dull means simple and not full of detail. Hope this helps!Please Rate Brainiest!
-Aslina
A reaction where heat is added is a(n)
endothermic reaction
heterogeneous reaction
reversible reaction
in endothermic reaction heat is added
Electro magnetic waves are blank waves
What’s the blank PLEASE HELP DUE IN 25 MINUTES!!!!
Answer:
Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field. Hope it helps ;)
6. Which of the following units would be MOST appropriate for measuring
the length of a car?*
1 poin
A. Millimeters
B. Centimeters
C. Meters
D. Kilometers
7. Which of the following units would be MOST appropriate for measuring
1 point
Answer:
Meter
Explanation:
what is one beneift of using scientific notation instead of regular notation
Answer:
its shorter than a regular one
Explanation:
the only reason is simply because it is shorter
How could the continents have gotten so far apart and how long did it take for this to happen
A student read that a block has a density of .70g/cm^3. When she tested this she got .63g/cm^3. What is her percent error
Answer:
The answer is 10 %Explanation:
The percentage error of a certain measurement can be found by using the formula
[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]
From the question
actual density = 0.7 g/cm³
error = 0.7 - 0.63 = 0.07
So we have
[tex]p(\%) = \frac{0.07}{0.7} \times 100 \\ = 10[/tex]
We have the final answer as
10%Hope this helps you
The diagram shows a balloon that was rubbed with a piece of cloth what is the change
Answer: the electric charge
Explanation:
Plzzzzz help me answer this question (WILL AWARD BRAINLIEST)
What is the energy of a photon of red light having a frequency of 3.08 x 10^14 HZ?
Answer:
2.04 x 10⁻¹⁹J
Explanation:
Given parameters:
Frequency = 3.08 x 10¹⁴Hz
Unknown:
The energy of the photon = ?
Solution:
The energy of a photon is given as;
E = hf
Where h is the planck's constant
f is the frequency
Insert the parameters and solve;
E = 6.63 x 10⁻³⁴ x 3.08 x 10¹⁴
E = 20.4 x 10⁻³⁴⁺¹⁴
E = 20.4 x 10⁻²⁰ = 2.04 x 10⁻¹⁹J
Answer:
2.97*10-19 j
Explanation:
E=Energy of photon
H=Planck constant=6.626*10-34
V=Frequency of photon
we can plug what we already know E=(6.626*10-34)(4.48*10 14)
Which of the following identifies the type of radiation that scientists most likely observed?
Radio
Infrared
Ultraviolet
Gamma Rays
Answer:gamma rays
Explanation: