Answer:
Hypothesis.
Explanation:
Investigation where only the independent variable is being tested by the scientist.
Scientists must be curious, honest, creative open minded skeptical , ethical and aware of bias. list 3 ways thinking like a scientist can help u in everyday life when doing things like shopping for a new bike,baking a cake, or reading a magazine??
Answer:
Explanation:
Thinking like a scientist can help me make daily rational decisions between my wants. In that the way I see want would be ultimately to satisfy the most pressing of needs. This is where the open minded nature of scientist will come in. A scientist would rather chose to buy a new bike than going on expensive dates in order to cut and save travel time.
Thinking like a scientist can help me save cost on actually going out there to buy a cake or making one myself. This is the creative aspect of being a scientist. Why have the ingredient and the skill and I will still choose to go out there buy a cake?
A scientist reads a magazine with all mind seeking to establish the bias that might be laden in an edition. This will help him to rationale between different information presented on the pages of the paper. He/she would question the information source and not believe the story completely.
2. Why do atoms combine to form chemical bonds?
Atoms combine because they are all working toward getting 8 valence electrons, except for noble gases. It is in their nature.
If you need a better explanation just ask in the comments.
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Read the second section, "Tsunamis Usually Happen In The Pacific Ocean."
Read the final section, "Warning Systems And Evacuation Plans Have Saved Lives."
How does the second section relate to the final section?
A
Both sections provide specific examples of the effects of tsunamis.
B
Both sections compare and contrast different causes of tsunamis.
C
The second section describes problems with studying tsunamis. The final section describes how scientists discovered a solution to the problems.
D
The second section describes scientists' predictions about tsunamis. The final section provides information about whether they were correct.
The second section explains why tsunamis are a significant risk in the Pacific Ocean, providing context for the development of warning systems and evacuation plans discussed in the final section.
The second section, which deals with the fact that tsunamis usually happen in the Pacific Ocean, is related to the final section about warning systems and evacuation plans in that it sets the context for the need for such systems. Because tsunamis are most prevalent in the Pacific, the presence of warning systems and evacuation plans in that area is crucial for saving lives. The mitigation efforts mentioned in the second section, such as the Pacific Tsunami Warning Center established after a tsunami in Hawaii, exemplify the types of responses that have been created to address the clear and present danger that tsunamis pose to coastal communities.
In which of the following situations is heat transferred from the source to popcorn kernels by the method of conduction?
An air popper is used
Popcorn bag is exposed to the sun
Bag of corn is placed in a microwave
Kernels are placed in a pan on a stove
Answer:
Kernels are placed in a pan on a stove
Explanation:
Heat transfer by conduction involves the actual movement between particles of the medium. For conduction to occur, the particles must be in contact with the heating medium or the body at a higher temperatures.
For the popcorn kernels to conduct heat using the conduction heat transfer process, the kernels are placed in contact with the heat source using the frying pan. The stove is the heat source.
When put a knife in contact with fire, it is heat transfer by conduction.
Answer:kernels are placed in a pan on a stove
Explanation:
Magnesium has 3 naturally occurring isotopes: 24 Mg (23.985 amu) with 78.99% abundance,
25 Mg (24.986 amu) with 10.00% abundance, and a third with 11.01% abundance.
Look up the atomic weight of magnesium, and then calculate the mass of the third isotope.
Answer:
The mass of third isotope is 25.98 amu.
Explanation:
Mass of Mg²⁴ = 23.985 amu
Mass of Mg²⁵ = 24.986 amu
Abundance of Mg²⁴ = 78.99 %
Abundance of Mg²⁵ = 10%
Abundance of third isotope = 11.01%
Atomic weight of magnesium = 24.305
Solution:
Atomic mass = ( % age of first isotope × its atomic mass) + (% age abundance of second isotope × its atomic mass) + ( % age of third isotope × its atomic mass ) / 100
Now we will put the values in formula.
24.305 = (78.99 × 23.985 ) + (10 ×24.986 ) + ( 11.01 × X) / 100
24.305 = 1894.56 + 249.9 +( 11.01 × X ) / 100
24.305 × 100 = 2144.46 + ( 11.01 × X)
2430.5 - 2144.46 = (11.01 × X)
286.04 / 11.01 = X
25.98 = X
The mass of third isotope is 25.98 amu.
The mass of the third isotope of magnesium, 26Mg, can be calculated using the atomic weight of magnesium and the known abundances and masses of the other two isotopes, 24Mg and 25Mg. The atomic weight is a weighted average of all isotopes, allowing for the determination of the unknown mass.
Explanation:The mass of the third isotope of magnesium can be calculated using the atomic weight of magnesium and the known abundances and masses of the other two isotopes. The atomic weight of magnesium is a weighted average of the masses of all naturally occurring isotopes, calculated based on their relative abundances. Since we have the relative abundances and masses for two of the isotopes (24Mg and 25Mg), we can use the given atomic weight of magnesium to find the mass of the third isotope, 26Mg.
Let's say the atomic weight of magnesium is X amu (this value can be found on the periodic table). To find the mass of 26Mg, we can set up the equation based on the equation for average atomic mass:
(0.7899)(23.985 amu) + (0.1000)(24.986 amu) + (0.1101)(M3 amu) = X amu
Where M3 is the mass of the third isotope that we are trying to find. We can solve for M3 to get the mass of the 26Mg isotope.
Which sequence has the states of matter listed from least to greatest kinetic energy!
A solid gas liquid
B. gas liquid → solid
C. liquid → solid gas
D. solid → liquid → gas
Answer: B. gas, liquid, Solid
Hope I Helped
:)
Answer:
C
Explanation:
Solid, liquid, gas
Stephanie purchased two watermelons. One watermelon weighed 6.95 kilograms. The second watermelon
weighed 952 grams more than the first.
How much did the second watermelon weigh in grams?
1 kilogram= 1000 grams
grams
Answer:
7.47 kilograms
Explanation:
Answer:if 1 kg is equal to 1000 g so 1000/952 is equal to 1.05 kg
Explanation:the second watermelon weigh 1.05 k than the first watermelon ,so 6.95 + 1.05= 8 k
what are the advantages of adulteration
The advantages of food adulteration includes a better appearance in the food and may increase the selling price, but these advantages only affect the producer of the product. Disadvantages include the increased risk of illness and allergic reactions due to the inedible products that are addedExplanation:
3.50 g of an unknown base is dissolved in 289 mL of water and has a concentration of 0.219 M. What is the the identification of the unknown base.
Answer:
The unknown base should be KOH whose molar mass is 56 g per mol (Answer)
Explanation:
Molarity = moles /(Volume in liters)
So,
Moles = Molarity [tex]\times[/tex] Volume
[tex]\\$=0.219 M \times 289 m L$\\\\$=0.219 \frac{m o l}{L} \times 0.289 L$\\\\$=0.063291 \mathrm{mol}$[/tex]
Molar mass = mass/moles
[tex]\\\\$=\frac{3.50 \mathrm{g}}{0.063291 \mathrm{mol}}=55.3 \mathrm{g}$ per mole[/tex]
The unknown base should be KOH whose molar mass is 56 g per mol (Answer)
Mole conversions.
Find the number of moles of argon in 607g of argon?
Answer:
24249.65 mol
Explanation:
n=MM × m
n= 39.95 ×607
n=24249.65
Janelle is observing a sample of matter. She notes that it is a shiny silver-colored solid, has a
mass of around 20 grams, and conducts heat and electricity well. What type of properties is
Janelle observing?
Chemical properties
Only intensive properties
Physical properties
Only extensive properties
Janelle is observing Physical properties.
Why?
The properties of matter can be classified as follows:
Extensive and Intensive: Extensive properties depend on the amount of matter involved in the measuring (e.g. mass), and intensive properties do not depend on the amount of matter (e.g. density, conductivity).Physical and Chemical: Physical properties do not involve a change in the nature of the substance that is being measured (e.g. color, length), while Chemical properties involve a change in the nature of the substance when they are measured (e.g. reactivity).The properties that Janelle observed are: Color (intensive, physical), mass (extensive, physical), heat conductivity (intensive, physical), and electrical conductivity (intensive, physical). All these properties are Physical properties.
Have a nice day!
Calculate the empirical formula for each compound.
2.677 g Ba, 3.115 g Br
To determine the empirical formula for the compound with given masses of Ba and Br, convert the masses to moles and find the ratio of the moles. In this case, the empirical formula is BaBr2.
Explanation:To calculate the empirical formula for each compound, we need to determine the ratio of the elements in the compound using their masses.
Given the masses of Ba and Br, we can convert them to moles using their respective molar masses.
The molar mass of Ba is 137.33 g/mol, and the molar mass of Br is 79.90 g/mol.
Using these values, we find that there are 0.0195 moles of Ba and 0.0390 moles of Br in the given sample.
To find the empirical formula, we need to divide the moles of each element by the smallest number of moles obtained. In this case, the smallest number of moles is 0.0195.
Dividing the moles of Ba and Br by 0.0195 gives us approximately 1 mole of Ba and 2 moles of Br.
Therefore, the empirical formula for the compound is BaBr2.
Any two objects that have mass will also have which type of force between them? A- Magnetic
B- Gravitational
C-Nuclear
D- Chemical
Remember for science class!!!!!!!!!!!!!!!
Answer:
Gravitational
Explanation: Hope This Helps And Have A Great Rest Of Your Day.
In a paper chromatography chamber, which example could be the stationary phase?
air
plastic plate
paper
Answer:
Paper
Explanation:
Paper chromatography is a method of separating mixtures of coloured substances into their components.
It uses a stationary phase and a mobile phase.
A tiny drop of a solution of the mixture is applied to the paper, which is suspended in a solvent.
The solvent flows through the paper and carries the components of the mixture with it.
Different components travel at different rates, so the mixture separates into different coloured spots as the solvent front moves up the paper.
The solvent moves up the paper, so it is the mobile phase.
The paper does not move, so it is the stationary phase.
Determine the energy in joules or a photon with frequency of 5.78 x 10^17 Hz
Answer:
E= 3.829 x 10-16 J
Explanation:
Data Given
Frequency= 5.78 x 10^17 Hz
Energy in joules = ?
Solution:
Formula used to calculate Energy
E= hv…………….. (1)
Where E is Energy
h is Planks Constant = 6.626 x 10–34 J s
v is frequency
The given frequency is in Hz (Hertz)
Hz is equal to s-1 (per second)
1 hertz = 1 /second
Putting the values in Equation 1
E= (6.626 x 10–34 J s) (5.78 x 1017 s-1)
E= 3.829 x 10-16 J
What is the mass of one mole of titanium atoms
Answer:
47.88 g
Explanation:
The atomic mass of titanium is 47.88 amu or 47.88 g/mol
it means,
one mole of titanium = 47.88 g
Which two atoms are isotopes of each other?
Answer:
C
Explanation:
Consulting the definition of an isotop we find that it requires the same element to obtain a different valence (?!) by accepting or donating electrons(?!)
The atoms that are isotopes to each other are ²⁴₁₂Mg and ²⁵₁₂Mg. Option C is correct.
Isotopes are the atoms of the same element. They have same number of electrons and protons. They have different number of neutrons. They have same atomic number but have different mass number. They are either stable or reactive.
For Example: Hydrogen has three isotopes, protium, deuterium and tritium. And, Chlorine has two isotopes, they are Chlorine-35 and chlorine-37.
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1.1 Outline a method for separating the chalk from potassium chloride,
Answer:
Explanation:
To separate the a mixture of chalk and potassium chloride, we must not that chalk is calcium carbonate compound, CaCO₃.
Calcium carbonate has low solubility in water. KCl is readily soluble in water and it is also an ionic compound.
To separate a mixture of compounds with various solubility, we can carryout dissolution, filtration and evaporation.
We first pour pure water into the mixture. Water will dissolve the potassium chloride readily.
Then using a filter paper we filter out the suspended chalk particles. Leave the filtrate to then dry and collect it.
The solution filtered should be evaporated to dryness. This will leave the KCl behind from the solution.
If gas in a sealed container has a pressure of 50 kPa at 300 K, what will the pressure be if the temperature rises to 360 K?
60 kPa
161 kPa
41 kPa
16 kPa
Answer:
[tex]\boxed{\text{60 kPa}}[/tex]
Explanation:
The volume and number of moles are constant, so we can use Gay-Lussac’s Law:
At constant volume, the pressure exerted by a gas is directly proportional to its temperature.
[tex]\dfrac{p_{1}}{T_{1}} = \dfrac{p_{2}}{T_{2}}[/tex]
Data:
p₁ = 50 kPa; T₁ = 300 K
p₂ = ?; T₂ = 360 K
Calculation:
[tex]\begin{array}{rcl}\dfrac{50}{300} & = & \dfrac{p_{2}}{360}\\\\\dfrac{1}{6} & = & \dfrac{p_{2}}{360}\\\\\dfrac{360}{6} & = & p_{2}\\\\p_{2} & = & \mathbf{60}\\\end{array}[/tex]
[tex]\text{The new pressure will be $\boxed{\textbf{60 kPa}}$}[/tex]
Suppose your bedroom is 21 ft long, 17 ft wide, and the distance from floor to ceiling is 7 ft, 6 in. You need to know the volume of the room in metric units for some scientific calculations. What is the room’s volume in cubic meters.
1. ______ m^3 (cubic meters)
2.______ L (Liters)
Answer:
1. 75.82 m^3 (cubic meters)
2. 75820 L (Liters)
Explanation:
Given data
L = 21 FT
W = 17 ft
h = 7 ft 6 in
Calculation
Formula to calculate volume is:
V= L×W×h
put the values in formula
V = 21 ft × 17 ft × 7 ft 6 in
V = 2677.5 ft
Now we will convert Cubic ft to cubic meters, as we know that 1 cubic meter is equal to 35.3147 cubic feet
V (m^3) = 2677.5 ÷ 35.3147
V (m^3) = 75.82 m^3
Now we will calculate liters
as we know that 1 cubic meter is equal to 1000 liters
so multiply the ans. with 1000
L = 75.82 × 1000
L = 75820 l
Why did other scientists discount Wegener's theory of continental drift? Why did Wegener have a hard time convincing other people that his idea was correct?
A. He couldn't explain how it happened, only that it did happen
B . He had a bad reputation in the scientific community
C. He never published his ideas in a report or book
D. He had no evidence
Answer:
He couldn't explain how it happened, only that it did happen
Explanation: The answer later came from someone else
Answer:
Option (A)
Explanation:
Alfred Wegener was the person who put forwarded the theory of continental drifting. But it was difficult for him to explain this theory. He had evidences regarding the drifting of the continents but he was not able to determine the main mechanism behind this continental motion. This is why he had a hard time convincing other people that his idea was correct.
Later, over a due course of time, the new and widely accepted theory known as the Plate tectonic theory, was able to prove the mechanism behind the drifting of the continents. The main mechanism behind this was the convection current that generates in the mantle, and these currents were formed because of the heat radiated from the interior of the earth.
Hence, the correct answer is option (A).
How many atoms are there in 1.60 moles of selenium
The number of atoms in 1.60 moles of selenium is approximately 9.64 x 10^23 atoms.
In order to determine the number of atoms in 1.60 moles of selenium, we need to use Avogadro's number. Avogadro's number is 6.022 x 10^23 atoms per mole.
So, for 1.60 moles of selenium, we can calculate the number of atoms as:
Number of atoms = 1.60 moles x 6.022 x 10^23 atoms/mole
Number of atoms = 9.6352 x 10^23 atoms
Therefore, there are approximately 9.64 x 10^23 atoms in 1.60 moles of selenium.
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An element has two naturally occurring isotopes, X-85 with a mass of 84.9118 amu and a natural abundance of 72.17%, and X-87 with a mass of 86.9092 amu and a natural abundance of 27.83%. Calculate the atomic mass of this element.
Final answer:
To calculate the average atomic mass of an element with three naturally occurring isotopes, multiply the mass of each isotope by its natural abundance in decimal form, and then sum the results.
Explanation:
To calculate the average atomic mass of an element with three naturally occurring isotopes, we need to multiply the mass of each isotope by its natural abundance in decimal form, and then sum the results. Let's use an example to illustrate this calculation. Suppose an element has three isotopes: X-1 with a mass of 1.000 amu and a natural abundance of 40%, X-2 with a mass of 2.000 amu and a natural abundance of 50%, and X-3 with a mass of 3.000 amu and a natural abundance of 10%. We can calculate the average atomic mass as follows:
(1.000 amu * 0.40) + (2.000 amu * 0.50) + (3.000 amu * 0.10) = 0.400 amu + 1.000 amu + 0.300 amu = 1.700 amu
The density of liquid Z is 0.9237 g/mL. A student masses a cup
with a sample of liquid Z in it and finds the mass to be 50.7 g.
The mass of the cup alone is 15.92 g. What is the volume of
liquid Z in the cup? (Volume = mass - density)
If the mass of the cup alone is 15.92 g, the volume of liquid Z in the cup will be 39.11 mL.
How to calculate the volume of liquid Z?Volume is a measure of the amount of space that matter occupies. Matter is defined as a physical substance that occupies space and has a mass.
Volume of liquid Z = (Total mass - Cup mass) / Density of liquid Z
= (50.7 g - 15.92 g) / 0.9237 g/mL
= 34.78 g / 0.9237 g/mL
= 39.11 mL.
Therefore, if the mass of the cup alone is 15.92 g, the volume of liquid Z in the cup will be 39.11 mL.
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Match the formula for the following compound: acetic acid HC 2H 3O 2 C 2H 3O 2 H 2C 2H 3O 2 HA
Final answer:
The formula for acetic acid is C2H4O2, also written as CH3COOH. Its empirical formula, derived by simplifying the molecular formula to the lowest whole number ratio, is CH2O.
Explanation:
The formula for acetic acid is C2H4O2, which can also be written as CH3COOH. In calculating its empirical formula, you would note the number of Carbon (C), Oxygen (O), and Hydrogen (H) atoms. You mentioned a given molecular formula of acetic acid as C2H4O2. This indicates a ratio of 2 Carbon atoms to 4 Hydrogen atoms to 2 Oxygen atoms. Dividing by the lowest common denominator, which is 2, yields a simplest whole-number ratio of atoms of 1:2:1, thus the empirical formula for acetic acid is CH2O.
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Which of the following describes a compound? (Hint: Carbon and oxygen both appear in the periodic table)
A. A piece of pure carbon, containing only carbon atoms
B. Oxygen gas surrounding a solid piece of carbon
C. A substance made of two Oxygen atoms for each carbon atom
D. Carbon and oxygen atoms mixed without being bonded together
Answer:
C is the correct answer
Explanation:
A compound is a substance that contains two or more atoms chemically combined together in a fixed ratio by mass.
Where are the electrons found in Bohr's atomic model?
Answer:
The answer to your question is letter D.
Explanation:
Bohr tells us that the electrons which have a negative charge clicle the orbits in specific nucleus, so the right answer is letter D.
Letter C is not possible because the electrons are in orbits circling the nucleus where the protons are.
Letter B is not correct because electrons are distributed in orbits but the amount of electrons in one orbit is different to the other one.
The electrons found around the nucleus in specific orbit in Bohr's atomic model.
So, option D is correct one.
What is Bohr's atomic model?This model explained about position of electron and their energy levels.
According to Bohr's atomic model the electron revolve around the nucleus in particular orbit or shell.
Rutherford's model described about nucleus which is surrounded by the electrons which is negatively charged.
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highlighted answer is wrong just need someone to explain it if you can!❤️
Answer:
2.7 x 10^-1
Explanation:
The places you move to the left are added to the 10 in negative exponential
If you added 45,000 calories to water that was at 25 degrees C, and the ending temperature was 35 degrees C, how much water did you have (in L)?
Answer:
4.5 L water we have in litres (L).
Explanation:
[tex]Q=m\times c \times \Delta T[/tex]
where
[tex]\Delta T[/tex] = Final T - Initial T
Q is the heat energy in calories
c is the specific heat capacity (for water 1.0 cal/(g℃))
m is the mass of water
Plugging in the values
[tex]\\$45000 \mathrm{cal}=m \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times\left(35^{\circ} \mathrm{C}-25^{\circ} \mathrm{C}\right)$\\\\$45000 \mathrm{cal}=m \times 1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times 10^{\circ} \mathrm{C}$\\\\$m=\frac{45000 \mathrm{cal}}{1.0 \frac{\mathrm{cal}}{\mathrm{g}^{\circ} \mathrm{C}} \times 10^{\circ} \mathrm{C}}$\\\\$m=4500 \mathrm{g}$\\\\Density of water $=\frac{\text { mass }}{\text { volume }}$[/tex]
So,
Volume of water = mass/density
[tex]\\\\=\frac{4500 \mathrm{g}}{\frac{1.09}{\mathrm{mL}}}=4500 \mathrm{mL}$$[/tex]
=4.5 L (Answer)
The attraction between particles give solids a definite
Answer:Shape and volume
Explanation: