Answer:
I Would Go Back To When There Were Cavemen Because I Would Love To See How Things Went On And How Women/Men Handled Themselves
Explanation:
Why Would I Travel To When Cavemen Were Here?
Because I Have A Fuji Film And I Would Love To Come Back To This Day And Show Everyone That Cavemen/Dinosoars ARE Real
How much sample will remain after 40 days for as 200 g sample of Radon-222? The half-life of Radon-222 is 4 days.
Answer:
[tex]\boxed{N_t =0.1953125 \: grams}[/tex]
Explanation:
Formula:
[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } [/tex]
Where Nt is the amount of substance remaining after time t,
N0 is the amount of substance at time t = 0,
t is the time at which we have to find out how much substance disintegrated from t = 0 to t = t
& t_1/2 is the half life corresponding radioactive sample.
Given:
N0 = 200g
t= 40 days
t1/2 = 4 days
To find:
Nt =?
Solution:
Substituting given data in above formula,
[tex]N_t = N_0( { \frac{1}{2} })^{ \frac{t}{t_ \frac{1}{2} } } \\ N_t = 200( { \frac{1}{2} })^{ \frac{40}{4 } } \\ N_t = 200 \times 0.0009765625 \\ \boxed{N_t =0.1953125 \: grams} [/tex]
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a given mass of gas occupies 500 cm³ at 25° C calculate the temperature in degree Celsius at which its volume becomes doubled at constant pressure
At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.
What is Charles's law?Charles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
V₁/T₁ = V₂/T₂
Given that;
Initial volume of gas V₁ = 500cm³Initial temperature of gas T₁ = 25°CIf final volume is double of initial volume.
Final volume V₂ = 2 × 500cm³ = 1000cm³Final temperature T₂ = ?V₁/T₁ = V₂/T₂
V₁T₂ = V₂T₁
T₂ = V₂T₁ / V₁
T₂ = ( 1000cm³ × 25°C ) / 500cm³
T₂ = 25000m³°C / 500cm³
T₂ = 50°C
At constant temperature, if the volume of the gas is doubled, the pressure also doubles. The new pressure of the gas is 50°C.
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: An unknown metal crystallizes in the cubic crystal structure. The metal has a radius 140pm, atomic mass of 135 g/mol, and density of 13.3 g/cm3. What type of cubic unit cell does this metal crystallize as
The cubic unit cell this metal crystallize as is BCC structure .
What is unit cell ?
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell.
The unit cell consists of lattice points that represent the locations of atoms or ions.
The entire structure then consists of this unit cell repeating in three dimensions
[tex]\rm \rho =\dfrac{nM}{N_{0} a^{3}} \\\\\\\\\rm n =\dfrac{\rho N_{0} a^{3}}{M} \\\\\\\\Assuming\; it \; to \; be \; a\; BCC\; structure \\\\\\ r = \dfrac{\sqrt{3} \times a}{4} \\\\\\Therefore\; a = 3.23 \times 10^{-8}\\\\\\\\\rm n =\dfrac{13.3 \times 6.022 \times 10^{23}\times 3.23^{3}\times (10^{-8})^{3}}{135} \\\\[/tex]
n= 2
Hence our assumption was correct
It is a BCC structure .
Therefore the cubic unit cell this metal crystallize as is BCC structure .
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importance of scientific learning
Answer:
scientific literacy provide essential tools for surviving in the news jungle and for responsible citizenship. They also teach us to understand our own actions, to review them critically, and to take care of our rights. This is why science education is important
Explanation:
A student is making tea on a cold day. When he tries to put honey in his tea, the honey will not flow out of the bottle. Describe how the student could make the honey flow out of the bottle more easily, and explain why your method would work.
Answer:
Warming it would make it come out. On a cold day the honey is frozen and atoms will not move as fast and are close toghether. When you warm it the atoms will move faster and the honey will come out of the bottle
Explanation:
What are communication skills??
Answer:
Communication skills are the abilities you use when giving and receiving different kinds of information. Some examples include communicating new ideas, feelings or even an update on your project. Communication skills involve listening, speaking, observing and empathising. It is also helpful to understand the differences in how to communicate through face-to-face interactions, phone conversations and digital communications like email and social media.
Explanation:
Answer:
The definition. Communication skills enable individuals to understand others and to be understood themselves. A variety of aspects are important in the context of these skills, such as listening, speaking, observing and empathy.
What is the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°c to 70.0°c when 2,520 j of heat is applied? use q equals m c subscript p delta t.. 0.00420 j/(gi°c) 0.00661 j/(gi°c) 238 j/(gi°c) 252 j/(gi°c)
The specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
How to calculate specific heat?The specific heat capacity of a substance can be calculated using the following formula:
Q = m × c × ∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature2520 = 10 × c × (70 - 10)
2520 = 600c
c = 4.2 J/g°C
Therefore, the specific heat of a substance if a mass of 10.0 kg increases in temperature from 10.0°C to 70.0°C when 2,520 J of heat is applied is 4.2 J/g°C.
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Answer:
A
Explanation:
Find the molarity of 194.55 g of sugar (c12h22o11) in 250. ml of water.
Draw two lewis structures for a compound with the formula c4h10. No atom bears a charge, and all carbon atoms have complete octets. Include all hydrogen atoms.
Answer:
See pictures!
Explanation:
Here is a drawing of butane (C4H10); labeled #1. An isomer of butane will also have the chemical formula C4H10 but is depicted different geometrically. I labeled this one #2.
What is the entropy of a solid based on?
A. The conductivity of the atoms
B. The arrangement of the atoms
O C. The atomic radii of the atoms
O D. The electronegativity of the atoms
ANSWER FAST PLS
3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.
Example Sentence
I am tired today and don't have much energy.
Energy:
____________
Example Sentence
Make sure to turn off the lights when you're done to save energy.
Answer:
Explanation:
3 Apply Many scientific words, such as energy, also have everyday meanings. Use context clues to write your own definition for each meaning of the word energy.
the temperature of gas is raised by 100 deggres to 200 deggres. what happens to the volume of the gas
Answer:
Increases by 100 Pa
Explanation:
According to The Ideal Gas Equation,
the temperature of the gas is directly proportional to the volume of the gas present in itIf the temperature rises from 100 K to 200 K, then the volume will increase by 100 Pa (standard unit of Pressure)4 Identify Give an example of a physical change and an example of a chemical change.
Answer:
Answer below
Explanation:
Physical changes dont change the chemical makeup of an object. An example would be to tear a piece of paper. Tearing the paper doesnt change how the paper was made chemically
Chemical changes on the other hand do change the chemical makeup of an object. An example of a chemical change would be to bake a cake. The reason being that the chemical makeup of the cake batter is changed so that the actual cake is formed.
7. Review Why do carbon atoms form four covalent bonds?
Answer:
four single covalent bonds
Explanation:
cuz a carbon atom initially has four unpaired electrons in its outermost shell....sharing adds four more....making four bonds
Why do elements in the same group on the periodic table have similar
properties?
Answer:
because they possess the same number of electron at their outermost shell
- CH₂ - CH₂ - CH₂
–
2
3
I
CH₂
CH₂-CH₂
CH₂
O 2,3-dimethylpentane
O2-methyl-3-methylpentane
O2,3-methylpentane
O 2-methyl-3-ethylbutane
Answer:
2,3-dimethyl pentane.........
What is the molarity of the resulting solution when 45.0 mL of a 1.90 M H2SO4 solution is added to 95.0 mL of 0.600 M H2SO4
When 45.0 mL of a 1.90 M H₂SO₄ solution is added to 95.0 mL of 0.600 M H₂SO₄the molarity of the resulting solution is 0.95 M.
To answer the question, we need to know what molarity is.
What is molarity of a solution?Molarity is the number of moles per unit volume with volume in liters.
To find the molarity of the resulting solution, we need to find the number of moles in each solution.
Number of moles, n = MV where
M = molarity of solution and V = volumeNumber of moles in first solution
Given that we have 45.0 mL of a 1.90 M H₂SO₄ solution.
M' = 1.90 M and V' = 45.0 mL = 0.045 L
So, n' = M'V'
= 1.90 M × 0.045 L
= 0.0855 mol
Number of moles in second solution
Given that we have 95.0 mL of 0.600 M H₂SO₄ solution.
M" = 0.600 M and V" = 95.0 mL = 0.095 L
So, n" = M"V"
= 0.600 M × 0.095 L
= 0.057 mol
Number of moles in resulting solution
The number of moles in the resulting solution is n'" = n' + n"
= 0.0855 mol + 0.057 mol
= 0.1425 mol
Volume of the resulting solution
The volume of the resulting solution is V"' = V' + V"
= 45.0 mL + 95.0 mL
= 150.0 mL
= 0.15 L
The molarity of the resulting solution
The molarity of the resulting solution is M'" = n"'/V"'
= 0.1425 mol/0.15 L
= 0.95 mol/L
= 0.95 M
So, the molarity of the resulting solution is 0.95 M.
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why is vanilla extract brown when vanilla ice cream is white?
please be as detailed as possible in your answer
Answer:
Because vanilla Ice cream contains vastly more milk, sugar, etc. Then vanilla extract. It only takes a very small amount in comparison to adding that flavor.
Explanation:
I hope this helps girl
Why is vanilla ice cream white instead of brown?
It is true that Vanilla beans are brown in color and it is interesting that with this brown color ingredient, Vanilla Ice Cream is still white. Well, the vast majority of vanilla flavoring comes in the form of extract. Vanilla beans are very expensive and pure Vanilla has great flavor. When Ice Cream is made, the Vanilla we put in the Ice Cream is very insignificant quantity when compared to the milk powder, sugar, and cream that goes into the Ice Cream. Due to the whipping and procedure of the making, the brown color of Vanilla is lost amongst the huge quantities of other ingredients and we get milky white yummy Vanilla Ice cream
The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8x10^-6 M/s. Which of the following would
explain a lower rate after another 3 seconds?
A) The concentration of reactants increased while the concentration of product decreased
B) The concentration of reactants decreased while the concentration of product increased
C) All concentrations of reactants and products decreased
D) All concentrations of reactants and products increased
Answer: B
Explanation:
Hurry please what will scientists do to solve invasive species? How will it problem solve? Will it be successful or effective?
Answer:
scientists could import or encourage breeding of a natural predator of the invasive species. it will be successful although may be a problem over time as the predator may become invasive.
Explanation:
this will greatly lower the amount of the invasive species as they are being consumed by an introduced predator, although you do risk making the predator an invasive species over time.
As the temperature increases to the ice cube's equilibrium stage, the average kinetic energy of the molecules….?
increases
decreases
remains the same
increases and then decreases
Answer:
Increase
Explanation:
if the temperature is increasing it will be slowly melting the ice causing it to turn into a liquid which will make the kinetic energy in the molecules increase.
What is the unbalanced and balanced equation of elephant's toothpaste!? PLEASE HELP!!
Answer:
2 H2O(g) + O2(g)
2 O-1 → O20 + 2 e- 4.
Explanation:
Essentially elephant's toothpaste is just the decomposition of H2O2, hydrogen peroxide. It's catalyzed by KMnO4
Balanced Equation: [tex]2H_2O_2 \ -- > \ 2H_2O \ + \ O_2_[/tex]
Unbalanced Equation: [tex]H_2O_2 \ -- > \ H_2O \ + \ O_2[/tex]
If 65.85g of N2 are placed in 17.5L container, the pressure is 1988 mmHg. What is the temperature of the gas?
Answer: The temperature of the gas if 65.85g of N2 are placed in 17.5L container with a pressure of 1988 mmHg is 1780. 6° C
Explanation:
The ideal gas law states that the volume, pressure and temperature of the a gas is related to the number of moles.
It is represented thus;
P V = n R T
Parameters :
Pressure, P = 1988 mmHg
Volume, V = 17.5 L
number of moles, n = mass ÷ molar mass
mass of N2 = 65.84g
Molar mass of N2 = 28.02 g/ mol
n = 65.85 ÷ 28.02
n = 2. 350 moles.
Temperature = ?
Universal gas constant, R = 8.314 J/mol. K
Calculations :
T = P V ÷ n R
T = 1988 × 17.5 ÷ 2.350 × 8.314
T = 34790 ÷ 19. 5379
T = 1780. 6 ° C
Thus, the temperature of the gas is 1780. 6 ° C
Question 3(Multiple Choice Worth 4 points)
(08.04 LC)
Which statement is true about a substance that has a pH value of 14?
O It is a weak base.
O It is a weak acid.
O It is a strong base.
O It is a strong acid.
A substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.
What the different pH reading indicates?The pH value 1 to 6 indicates acidic, 7 shows neutral whereas pH from 8 to 14 shows basic nature. pH 1 shows strong acid which becomes weak when it goes to 6 while on the other hand, pH 8 is a weak base which increases when it reaches to 14.
So we can conclude that a substance that has a pH value of 14 is a strong base because pH 8 to 14 represents base.
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Answer:
C. It is a strong base
Explanation:
pH 1 to 6 is acid (weaker)
pH 7 is neutral
pH 6 to 14 is base (stronger)
Fluorine-21 has a half-life of approximately 5 seconds. what percentage of the original nuclei would remain after 15 seconds
Answer:
1/8th = 12.5%
Explanation:
Three half lives would be 1/2 * 1/2 * 1/2 = 1/8 th of original
An increase in the population of an organism would most likely be associated with which of the following?
Answer:
An expansion of suitable living space
Explanation:
Increase occurs in the population of the organism only occurs when there is a suitable environment present for that organism. Suitable environment means that place where all the needs of the organism are available such as food, water and shelter etc. If food and water are present in large amount and decrease in animals occurs that prey on that organism will increase the population of the organism.
question 2
metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas.
a. if 24.3 g mg are heated with 12.0 g h20, identify the limiting reactant - magnesium or water (steam)?
Explanation:
[tex]molar \: mass(mg) = 24g. {mol}^{ - 1} mass = 24.3g \\ molar \: mass(h20) = 18g. {mol}^{ - 1} mass = 12g \\ n = \frac{mass}{molar \: mass} \\ n(mg) = 1.01mol wich \: is \: substance \: a\\ n(h2o) = 0.67mol \: which \: is \: substance \: b \\ \frac{ |n|a }{ |n|b } : \frac{a}{b} \\ \frac{1.01}{0.67}: \frac{1}{2} \\ 1.51 > 0.50 \\ therefore \: substnce \: b \: which \: is \: water \: steam \: is \: limiting \: reagent [/tex]
15. The bird flu, also known as influenza A, is caused by a virus. Pneumonia, which can have similar symptoms to
influenza A, is caused by a bacterial infection. Which statement best summarizes the difference between these two
diseases?
O Viruses are living organisms while bacteria are not.
O Viruses are non-living organisms while bacteria are living.
O Bacterial infections are harmless to humans while viruses can be deadly.
Bacterial infections are harmful to humans while viruses can be beneficial.
Describe the steps, in detail, of creating a water compass. Please remember to write in complete sentences.
Weather is influenced by global patterns of atmospheric movement. Winds and
ocean currents are evidence for the process of
Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.
What are winds and ocean currents?Ocean current is the flow or movement of water in a direction by gravity, wind, and difference in density of the water.
Wind currents pull water and create ocean currents. The current flow to westwards, which is called Coriolis effect.
Thus, Winds and ocean currents are evidence for the process of regulating and stabilizing the climate patterns.
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