Answer:
d
Explanation:
The statement that is true about the process Austin uses to separate this mixture is that Austin uses neither physical nor chemical changes to separate the mixture's components. The correct option is D.
What is a laboratory?A laboratory is a place with carefully regulated circumstances where experiments, measurements, and scientific or technological research can be done.
Here, Austin is separating a mixture in the laboratory. Now, iron is attracted to the magnet, and sand and salt are not attracted to the magnet. So these will be separated by the magnetic property of the iron. It is a physical property of a substance that matters in this separation.
Thus, the correct option is D. Austin uses neither physical nor chemical changes to separate the mixture's components.
To learn more about separating substance, refer to the link:
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7 Ba(ClO3)2
How many oxygen atoms are shown?
The image below shows how warm and cool
air moves over Earth
What is this type of air movement called?
A. convection current
B. atmospheric current
C. horizontal air current
D. prevailing surface winds
Answer:
convection current
Explanation:
Why do you think Leeuwenhoek was so excited about what he saw?
Answer:
van Leeuwenhoek called the organisms he saw in his microscope "animalcules." also he shined light on specimen so that he could see the right cells
What volume would be occupied by 2.79 moles of nitrogen gas at STP?
Answer:
22.4
Explanation:
Which is true of scientific questions?
A. Few scientific questions lead to useful investigations.
B. Scientific questions are answered by doing experiments.
C. Many scientific questions are too complex to be tested.
D. Scientific questions are biased by the opinions of scientists.
Review the electron configurations of the elements in period 3, from sodium (Na) to argon (Ar). What do you observe?
Answer:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies.
[tex]Na:11:1s^22s^22p^63s^1 [/tex]
[tex]Mg:12:1s^22s^22p^63s^2[/tex]
[tex]Al:13:1s^22s^22p^63s^23p^1 [/tex]
[tex]Si:14:1s^22s^22p^63s^23p^2 [/tex]
[tex]P:15:1s^22s^22p^63s^23p^3 [/tex]
[tex]S:16:1s^22s^22p^63s^23p^4 [/tex]
[tex]Cl:17:1s^22s^22p^63s^23p^5 [/tex]
[tex]Ar:18:1s^22s^22p^63s^23p^6 [/tex]
The last electron enters the third shell in all elements from Sodium to Argon.
Answer: After the 3s sublevel is filled with two electrons, each additional electron goes into the 3p sublevel.
Explanation: plato/ edmentem answer
2.At 35°C, a small sample of methane gas (CH4) has a volume of 1.5 liters. The temperature of the methane gas is slowly cooled to 17°C. What is the new volume of the methane sample?
Answer:
V₂ = 1.41 L
Explanation:
Given data:
Initial temperature = 35°C (35 +273.15 K = 308.15 K)
Initial volume = 1.5 L
Final temperature = 17°C (17+273.15 K = 290.15 K)
Final volume = ?
Solution:
The given problem will be solve through the Charles Law.
According to this law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
V₂ = V₁T₂/T₁
V₂ = 1.5 L × 290.15 K / 308.15 k
V₂ = 435.23 L.K / 308.15 k
V₂ = 1.41 L
10. Name an example of the cause for each of the following:
_a.physical weathering
b.chemical weathering
Answer:
Physical Weathering
Frost wedging. Frost wedging happens when water filling a crack freezes and expands (as it freezes, water expands 8 to 11% in volume over liquid water). ...
Heat/Cold Cycles. ...
Unloading
Explanation:
What do Oxygen and Hydrogen make?
love duuuh dumm dumm
How much current is drawn by a 40-W bulb in a 120-V circuit?
3. An unknown compound was found to have a molar mass of 75.0 g/mol and to
contain 32.0% carbon, 6.7% hydrogen and 18.7% nitrogen. The rest of the molecule
consists of oxygen. What is the molecular formula of the compound?
How does sexual reproduction increase the chance of a population's survival?
A. Offspring are produced in greater numbers
B. Offspring are produced in a shorter amount of time
C. Sexual reproduction produces offspring in both plants and animals
D. Sexual reproduction produces more genetically diverse offsprings
C? i think, the rest just isnt right. i wouldve thought there was an answer that would say "it provides us with more organisms" but the closest one to that is C
Answer:
D
Explanation:
the more genetic variation in a population the better their chances are to survive
Question 1 (1 point)
Use coefficients to balance the following reaction:
Na + 02 → Na20
Blank 1:
Blank 2:
Blank 3:
Answer:
Blank 1: 4
Blank 2: 1
Blank 3: 2
Explanation:
The unbalanced reaction expression is given as:
Na + O₂ → Na₂O
Now, we use a mathematical approach to balance the reaction given above.
Assign coefficients a , b and c for the blanks:
aNa + bO₂ → cNa₂O
Conserving Na : a = 2c
O: 2b = c
So, let c = 1, a = 2 and b = [tex]\frac{1}{2}[/tex]
Multiply through by 2;
a = 4, b = 1 and c = 2
4Na + O₂ → 2Na₂O
Blank 1: 4
Blank 2: 1
Blank 3: 2
5.0g of copper is heated from 20 Celsius to 80 Celsius. How much energy it was used to heat Cu? (Specific heat capacity of Cu is 0.092 cal/g)
Answer:
the energy used to heat Cu is 27.6 Cal
Explanation:
given data
mass m = 5 g
Specific heat capacity of Cu = 0.092 cal/g
temperature T2 = 80 Celsius
temperature T1 = 20 Celsius
solution
we get here energy used to heat Cu that is express as
Q = m × c × ΔT ....................1
so here m = mass and c = specific heat capacity
and ΔT = T2 - T1
so put value in eq 1
Q = 5 × 0.092 × (80 - 20)
Q = 27.6 Cal
so that the energy used to heat Cu is 27.6 Cal
What is an oxidation number?
a
The charge acquired by an atom in a chemical bond
b
The number of electrons involved in a chemical bond
c
The number of oxygen atoms an element will bond with
d
The number of oxygen atoms a compound has
Answer:
d
Explanation:
i hope it helps you good luck
When the sun shines and heats something, that energy is called-
Answer:
Solar energy.
Answer:
All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum.
a. 20 moles of NH3 are needed to produce how many moles of H2O?
b. How many moles of N2 will be produced if 3.5 moles of O2 react?
a. 30 moles of H₂O
b. 2.33 moles of N₂
Further explanationGiven
a. 20 moles of NH₃
b. 3.5 moles of O₂
Required
a. moles of H₂O
b. moles of N₂
Solution
Reaction
4NH₃+3O₂⇒2N₂+6H₂O
a. From the equation, mol ratio NH₃ : H₂O = 4 : 6, so mol H₂O :
=6/4 x mol NH₃
= 6/4 x 20 moles
= 30 moles
b. From the equation, mol ratio N₂ : O₂ = 2 : 3, so mol N₂ :
=2/3 x mol O₂
= 2/3 x 3.5 moles
= 2.33 moles
The moles of H₂O produced by 20 moles of NH₃ are 30 moles, moles of N₂ produced by 3.5 moles of O₂ is 2.3 moles.
What is moles?
Moles is a unit of mass, which gives information about the relative amount of species present in any reaction.
Given chemical reaction will be represented as:
4NH₃ + 3O₂ → 2N₂ + 6H₂O
From the stoichiometry of the reaction it is clear that-
4 moles of NH₃ = produce 6 moles of H₂O
20 moles of NH₃ = produce 6/4×20=30 moles of H₂O
Again from the stoichiometry of the reaction it is clear that-
3 moles of O₂ = produce 2 moles of N₂
3.5 moles of O₂ = produce 2/3×3.5=2.3 moles of N₂
Hence required moles are 30 moles of H₂O and 2.3 moles of N₂.
To know more about moles, visit the below link:
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does tin or lead have a larger atomic radius??
Which factor can increase the potential energy of an object?
Decrease in speed
Decrease in density
Increase in temperature
Increase in height from the ground
Answer:
Increase in height from the ground.
Explanation:
Potential energy =mass×acceleration due to gravity×height.
P.E= mgh
how many formula units are in 0.96 moles of H2O
Answer:
18.02 amu
Explanation:
What does x mean- like person x person?
Answer:
× = and
Explanation:
person and person
Ello fellers
A chemical change is also known as a:
1.endothermic reaction
2.exothermic reaction
3.solution
4.chemical reaction
can anyone do balance equation?
What is a quantum of energy?
Answer:
In chemistry and physics, quantum refers to a single packet of matter or energy. In practical use, it refers to the minimum amount of energy required for a change or the minimum value of any physical property in an interaction. Quantum is the singular form of the word. Quanta is the plural form of the term.
Explanation:
Answer:
quantum of energy
Explanation:
The term quantum of energy means that the energy is not transferred continuously but as discrete packets of energy. Amount of energy required to move an electron from one energy level to another. The amount of energy an electron gains or loses is. Not always the same. The higher energy levels are.
hope it helps!
does conduction reflect light?
Answer:
Conduction Should not have anything to do w/ Light.
Explanation:
The reason being is because Conduction is the process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material.
What is the charge of an atom with 21 protons and 20 electrons?
Answer:
Positive
Explanation:
If an atom has more protons than electrons, its charge with be positive. Protons have a positive charge, and electrons have a negative charge.
What would be the new pressure if a gas at 1 atm pressure and 20c was heated to 80c
Answer:I think it’s
Explanation:
190c
If an 85.0 mL container of helium gas at standard pressure is heated from 20.oC to 91oC and the pressure is increased to 2.8 atm, then what would the new volume be for the He gas
Answer: V₂ = 37.71mL
Explanation: To determine the new volume of Helium gas, use the Combined Gas Law, which states the following relationship among pressure, volume and temperature:
[tex]\frac{P_{1}V_{1}}{T_{1}} =\frac{P_{2}V_{2}}{T_{2}}[/tex]
where index 1 relates to the initial state of the gas and index 2 to the final state of the gas.
Temperature is in Kelvin, so:
T = °C + 273
For this situation, standard pressure is 1 atm. Temperatures will be:
T₁ = 20 + 273 = 293 K
T₂ = 91 + 273 = 364 K
Solving:
[tex]V_{2}=\frac{T_{2}P_{1}V_{1}}{P_{2}T_{1}}[/tex]
[tex]V_{2}=\frac{364*1*85}{2.8*293}[/tex]
[tex]V_{2}=\frac{30940}{820.4}[/tex]
[tex]V_{2}=[/tex] 37.71
The new volume of He gas is 37.71 mL.
Explain the trend you see in your graph and explain why this occurs at a particle level what is happening when the volume or pressure increases what does the particles do within the sample explain this concept in detail
Answer:
incline
Explanation:
Lab: Acids and Bases Assignment: Lab Report
What is the purpose of the lab, the importance of the topic, and the question you are trying to answer?
What is your hypothesis (or hypotheses) for this experiment?
What methods are you using to test this (or each) hypothesis?
Section II: Data and Observations
Locate the data and observations collected in your lab guide. What are the key results? How would you best summarize the data to relate your findings?
Do you have quantitative data (numerical results or calculations)? Do you have qualitative data (written observations and descriptions)? How can you organize this date for your report?
Section III: Analysis and Discussion
What do the key results indicate?
If you constructed graphs, what trends do they indicate in your data?
Were there any problems with the experiment or the methods? Did you have any surprising results?
Section IV: Conclusions
What do the results tell you about your hypothesis(es)?
How do the data support your claim above?
If you could repeat the experiment and make it better, what would you do differently and why?
Answer:
Lab: Acids and Bases Assignment: Lab Report
The main point is to help the scientific method and to also see how it works.Sometimes people refer to the tentative answer as "an educated guess." Keep in mind, though, that the hypothesis also has to be testable since the next step is to do an experiment to determine whether or not the hypothesis is right! A hypothesis leads to one or more predictions that can be tested by experimenting.>State the hypotheses. Every hypothesis test requires the analyst to state a null hypothesis and an alternative hypothesis. The hypotheses are stated in such a way that they are mutually exclusive. That is, if one is true, the other must be false; and vice versa.>Formulate an analysis plan. The analysis plan describes how to use sample data to accept or reject the null hypothesis. It should specify the following elements.>Analyze sample data.Using sample data, perform computations called for in the analysis plan.>Interpret the results. If the sample findings are unlikely, given the null hypothesis, the researcher rejects the null hypothesis. Typically, this involves comparing the P-value to the significance level, and rejecting the null hypothesis when the P-value is less than the significance level and etc.Section II: Data and Observations
In a lab guide, the key results are those that support my working hypotheses or serve to reject these assumptions. Moreover, the key results may also be other discoveries that are important to understand the processes and/or mechanisms investigated in the experiment.•?
Section III: Analysis and Discussion
Key Results are the measures and milestones that indicate how you know you will accomplish our Objective.A linear pattern is a continuous decrease or increase in numbers over time. On a graph, this data appears as a straight line angled diagonally up or down (the angle may be steep or shallow). So the trend either can be upward or downward.Yes, i was surprised and learn so much and it was no problem.Section IV: Conclusions
Results will tell you which hypothesis is true.describe specific part of the procedure.If I were able to repeat the lab and do it differently I would try to do two different things to improve it. I would try to create the model in a simpler manner that allowed me to better see how the erosion factored in. I would also try to take more detailed notes on it if I were to repeat it.i hope it's helpAnswer:
anyone know the section II answers for a lab like this but its the thermal energy transfer lab
Explanation:
^^
