A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level?
A. zero in the first energy level, eight in the second energy level
B. eight in the first energy level, zero in the second energy level
C. four in the first energy level, four in the second energy level
D. two in the first energy level, six in the second energy level
Answer:
energy level I can hold a maximum of two electrons, and energy level II can hold a maximum of eight electrons. so it must be D
Explanation:
two in the first energy level, six in the second energy level
i took the test already you can go to my quizlet to get study cards for the test
Plz help me out ASAP!!
Conversion : J ➝ Cal
[tex]\bigstar\:\boxed{\bf{\purple{4.2\:Joule=1\:Cal}}}[/tex]
[tex]:\implies\sf\:3.5\times 10^6\:J[/tex]
[tex]:\implies\sf\:3.5\times 10^6\:J\times \dfrac{1\:Cal}{4.2\:J}[/tex]
[tex]:\implies\sf\:0.833\times 10^6\:Cal[/tex]
[tex]:\implies\bf\:8.33\times 10^5\:Cal[/tex]
Materials expand when heated. Consider a metal rod of length L0 at temperature T0. If the temperature is changed by an amount ΔT, then the rod’s length changes by ΔL=αL0ΔT, where α is the thermal expansion coefficient.
For steel, α=1.24×10−5∘C−1.(a) A steel rod has length L0=40cm at T0=40∘C. What is its length at T=180∘C?
(Use decimal notation. Give your answer to three decimal places.)
L≈cm
(b) Find its length at T=90∘C if its length at T0=120∘C is 65 in.
(Use decimal notation. Give your answer to three decimal places.)
L≈ in.
(c) Express length L as a function of T and α if L0=60in. at T0=150∘C.
(Use symbolic notation and fractions where needed.) L(T,α)=
Answer:
(a) The length at temperature 180°C is 40.070 cm
(b) The length at temperature 90°C is 64.976 inches
(c) L(T, α) = 60·α·T - 9000·α + 60
Explanation:
(a) The given parameters are
The thermal expansion coefficient, α for steel = 1.24 × 10⁻⁵/°C
The initial length of the steel L₀ = 40 cm
The initial temperature, t₀ = 40°C
The length at temperature 180°C = L
Therefore, from the given relation, for change in length, ΔL, we have;
ΔL = α × L₀ × ΔT
The amount the temperature changed ΔT = 180°C - 40°C = 140°C
Therefore, the change in length, ΔL, is found as follows;
ΔL = α × L₀ × ΔT = 1.24 × 10⁻⁵/°C × 40 × 140°C = 0.07 cm
Therefore, L = L₀ + ΔL = 40 + 0.07 = 40.07 cm
The length at temperature 180°C = 40.07 cm
(b) Given that the length at T = 120°C is 65 in., we have;
The temperature at which the new length is sought = 90°C
The amount the temperature changed ΔT = 90°C - 120°C = -30°C
ΔL = α × L₀ × ΔT = 1.24 × 10⁻⁵/°C × 65 × -30°C = -0.024375 inches
The length, L at 90°C is therefore, L = L₀ + ΔL = 65 - 0.024375 = 64.976 in.
The length at temperature 90°C = 64.976 inches
(c) L = L₀ + ΔL = L₀ + α × L₀ × ΔT = L₀ + α × L₀ × (T - T₀)
Therefore;
L = 60 + α × 60 × (T - 150°C)
L = 60 + α × 60 × T - 9000 × α
L(T, α) = 60·α·T - 9000·α + 60
Round 1047.78 to three sig figs
105
100
1030
Answer:
1047.78
nearest tens is 1047.70
nearest thousandth is 1050.78
Which of the following properties of an unknown substance would allow it to be classified as a mixture? The unknown substance
Answer:
D. has different properties when sampled in different areas.
Explanation:
The general property of a mixture says that each substance or component in a mixture has its individual or different property which can be separated on the basis of different methods.
Such as a mixture of oil and water is a heterogeneous mixture and have different properties or different densities, which helps them to be sampled in different areas.
Hence, the correct answer is "D".
what’s the name of the compound AgNO3
Answer:
Silver nitrate
Explanation:
Can someone find the independent variable and the dependent variable ?
An ice cube is left on the kitchen counter. After some time, the ice cube melts into a small puddle of water.According to the law of conservation of mass, how does the mass of the puddle of water compare to the mass of the original ice cube
Answer:
Mass of the water is equal to the mass of ice
Explanation:
When ice melts, the mass remains the same even though its volume decreases leading to a decrease in density of water.
The mass remains the same because according to the law of conservation of mass, mass can neither be created nor destroyed. Since mass is neither created nor destroyed in the process of melting, the mass of water must remain the same.
How can nuclear energy be converted in electrical energy
Answer:
A clean energy resource
Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.
Explanation:
Answer:
Nuclear energy originates from the splitting of uranium atoms – a process called fission. This generates heat to produce steam, which is used by a turbine generator to generate electricity. Because nuclear power plants do not burn fuel, they do not produce greenhouse gas emissions.
Explanation:
The healing of a cut finger. Is it a physical or chemical change? Explain.
Wound healing is a chemical change.
A chemical change involves the formation of a new substance. A substance changes form from one form into another in the process. A physical change does not involve the formation of new substances. Wound healing involves a number of chemical changes.
A wound can also be referred to as a tissue damage. When a tissue is damaged, bleeding results. Bleeding could lead to so much loss of blood.
The human body has mechanisms in place to combat this excessive loss of blood. This occurs when a complex biochemical pathway leads to the formation of fibrinogen. The enzyme thrombin converts fibrinogen to fibrin. The formation of fibrin is very essential to the wound healing process.
We can see that a series of chemical changes are involved in the process of wound healing when your finger is cut.
https://brainly.com/question/6284546
Find the distance between the two points on a number line
-18 and -4
Answer:
14
Explanation:
How were the ideas of Aristotle and Democritus similar to the alchemists'?
Answer:
The ideas of Aristotle and Democritus were on a similar basis to the alchemists.
Explanation:
Aristotle believed that all matter was made from four elements: earth, air, fire, and water. Democritus was the first person to realize that if something was cut in half continuously it can never be broken down completely. Democritus called the units that could not be broken down atoms. Early alchemists believed and based their works on the notion that atoms could be rearranged into making new elements. All three of their ideas more or less work with atoms and elements.
What do group numbers on the periodic table identify?
valence electrons
which is an outer shell electron
3. Complete the following conversions.
a. 10.5g=__kg
b. 1.57 km = ___m
c. 3.54 ug = ___g
d. 3.5 mol=___umol
e. 1.2 L = ___mL
f. 358 cm = ____m3
g. 548.6 ml. =____cmii
Answer:
a. 0.0105
b. 1.570
c. 0.00000354
d. 35,000,000
e. 1200
f. 0.000358
g. 548.6
The complete conversion of the given examples are as follows:
a. 10.5g = 0.00105 kg
b. 1.57 km = 1570 m
c. 3.54 ug = 3.54 × 10⁻⁵ g
d. 3.5 mol = 3.5 × 10⁶ umol
e. 1.2 L = 1200 mL
f. 358 cm = 3.58 × 10⁻⁴ m³
g. 548.6 ml = 548.6 cm
Conversion is a multi-stage procedure, which requires a numerical factor to multiply or divide and the appropriate selection of a number of important digits.
Using the International System Units for Conversions Factors.
(a)
If 1 g = 0.001 kg
∴
10.5 g will be:
[tex]\mathsf{= \dfrac{10.5 \ g \times 0.0001 \ kg}{1 \ g}}[/tex]
= 0.00105 kg
(b)
If 1 km = 1000 m
1.57 km will be:
[tex]\mathsf{= \dfrac{1.57 \ km \times 1000\ m}{1 \ km} }[/tex]
= 1570 m
(c)
If 1 ug = 1 × 10⁻⁵ g
∴
3.54 ug will be:
[tex]\mathsf{= \dfrac{3.54 \mu g \times 1 \times 10^{-5} \ g }{1 \ \mu g}}[/tex]
= 3.54 × 10⁻⁵ g
(d)
If 1 mol = 10⁶ umol
∴
3.5 mol will be:
[tex]\mathsf{= \dfrac{3.5 \ mol \times 10^6 \ u \ mol}{1 \ mol} }[/tex]
= 3.5 × 10⁶ umol
(e)
If 1 L = 1000 mL
∴
1.2 L will be:
[tex]\mathsf{=\dfrac{1.2 \ L \times 1000 \ mL}{1 \ L}}}[/tex]
= 1200 mL
(f)
If 1 cm = 0.000001 m³
∴
358 cm will be:
[tex]\mathsf{= \dfrac{358\ cm \times 0.000001 m^3}{1 \ cm}}[/tex]
= 3.58 × 10⁻⁴ m³
(g)
If 1 mL = 1 cm
∴
548.6 mL will also be equivalent to 548.6 cm
Therefore, from the above explanation, we've seen how to convert from one unit to another.
Learn more about conversion rates here:
https://brainly.com/question/5685229?referrer=searchResults
An object velocity can be described by I s acceleration and direction
Answer:
Yes.
Explanation:
How much force is needed to accelerate a 66 kg skier at 2 m/sec2
Answer:
132N
Explanation:
F=ma
F=66×2
F=132N
The answer is 132 N
The parameters given in the question are;
mass= 66 kg
acceleration= 2m/s
Therefore the force can be calculated as follows;
F= mass × acceleration
= 66 × 2
= 132
Hence the force needed is 132 N
Please see the link below for more information;
https://brainly.com/question/19847722?referrer=searchResults
starting from phenol how would you obtain benzaldehyde
Answer:
A significant quantity of natural benzaldehyde is produced from cinnamaldehyde obtained from cassia oil by the retro-aldol reaction: the cinnamaldehyde is heated in an aqueous/alcoholic solution between 90 °C and 150 °C with a base (most commonly sodium carbonate or bicarbonate) for 5 to 80 hours, followed by ...
Explanation:
What is one important step to complete before starting a laboratory experiment?
O Clean up the materials that were used.
Discard chemicals in the proper waste bin.
O Ask the teacher if you are confused about the laboratory procedure.
Change into contact lenses to protect your glasses,
Answer:
Ask the teacher
Explanation:
Ask if you have to clean up or if you are not prepared for an experiment
Answer:
ask the teacher
Explanation:
because he needs help so he has to task the teacher.
HELP ASAP PLEASE
Outline a sample experiment you could set up to investigate the effect of drinking Starbucks on student test scores. List all components in the 2nd objective above.
In addition to describing and explaining mental processes and behavior, psychology also attempts to __________ these phenomena. Group of answer choices
Answer:
The correct approach will be "Predict and control ".
Explanation:
Psychology seems to be the study including its thought process as well as behavior. The psychological layouts in this article that the individual requires to understand, feel, and so on, whereas action seems to be how someone behaves. Psychologists as well as physicians speculated about either the relation was seen between the mind and perhaps the nervous system while philosophers struggled to understand the links between the organs.which light would you predict to produce the greenest plant
Explanation:
The light of the sun is important for green plant to grow
Sam is making an aquaponics garden. He needs 2.3 dkg of granite. He has 460 g. How much more does he need? Explain your answer with your work.
Explanation:
He needs 2.3 dkg
dkg is a unit of mass and represents dekagrams.
The relationship between dkg and g is given as;
1 dkg = 10g
This means he needs 2.3 * 10 = 23 g of graphite.
Since he already has 460g of graphite, he doesn't need any additional graphite.
The proton has a mass of?
Control group
Matching
Match the word to the definition Write the letter on the line
6. Scientific inquiry
А. This group shows the effect of the verable beng tested
7 Hypothesis
В. This is the one veriable thet is changed
8
C A welltested expleretion for expermental results
9 Expermertel group
D The many ways in which scientists study the natural world
10
Independent verable E A possible answer to a scientfic question
11
Dependent veriable
F This describes en observedpettern in nature
12 Scientific theory G This group is left alone end not experimented on
12 Scertfic low
H This is the veriable that gets messured
Identithin
Answer:
i also have to do this lol
Explanation:
A bar if soap is 12cm tall 6 cm wide and 10 cm long if has a mass of 415 grams what is the density is
Answer:
density= mass/volume. volume= 12 x 6 x 10. 415/720=.57g/cm^3
Explanation:
Answer: 0.58g/cc density of the Soap.
Explanation:
Question 3
25 pts
If a can of soup contains 22.0 oz (ounces) of soup, how many grams of soup is that? (1 lb
= 16 oz, 1 lb = 454 g)
330 g
624 g
O 0.0485 g
Answer:
D
Explanation:
D
22/16*454≈624g
624g grams of soup is that, If a can of soup contains 22.0 oz (ounces) of soup. Hence, option C is correct.
What are ounces?1 ounce is equal to 437.5 grains or 28.349 grams.
Given :
A can of soup contains 22.0 oz (ounces) of soup.
16 oz = 1 lb
So, 22.0 oz is equal to [tex]\frac{1 X \;22.0}{16}[/tex]
=1.375 lb
And given that:
1 lb = 454 g
so, 1.375 lb = 1.375 X 454
624.25 =624g
Hence, 624g grams of soup is that, If a can of soup contains 22.0 oz (ounces) of soup.
Learn more about ounces here:
https://brainly.com/question/2284300
#SPJ2
What is true of neutrons?
The new element "Leo (L)" has three stable isotopes: L-82 (exact mass: 81.8735), L-85 (exact mass: 84.8322), and L-86
(exact mass: 85.6299). The relative abundances are 64.8%, 18.5%, and 16.7%, respectively. What is the average atomic
mass of element L?
Answer:
83.637562
Explanation:
Anyone else getting this
Answer:
yeeehhhhhh
Explanation:
basically my charger doesnt work
What NaClNaCl concentration results when 259 mL259 mL of a 0.850 M0.850 M NaClNaCl solution is mixed with 567 mL567 mL of a 0.240 M0.240 M NaClNaCl solution?
Answer:
0.431M
Explanation:
To find the concentration of NaCl we need to know how many moles comes from each solution. Then, we need to sum the total volume in liters and, as molarity (Unit of concentration) is the ratio between moles and volume we can determine concentration.
Moles from first solution:
259mL = 0.259L * (0.850mol / L) = 0.22015 moles of NaCl
Moles from second solution:
567mL = 0.567L * (0.240mol / L) = 0.13608 moles of NaCl
Total moles:
0.22015 + 0.13608 = 0.35623 moles of NaCl
Total volume:
259mL + 567mL = 826mL = 0.826L
Thus, molarity of the mixture is:
0.3562 moles NaCl / 0.826
0.431M