Answer:
Physical reaction
Explanation:
Since there are no other chemicals in the equation, but the state of the chemical is going from a liquid to a gas, you can conclude that this is a physical reaction.
What happens to the mass of a substance during a chemical reaction?
Answer: In a chemical reaction the total mass of all the substances taking part in the reaction remains the same.
Why does the periodic table continue to expand?
Answer: Because new elements are being discovered
Explanation:
Write the hyphen notation for the element that contains 15 electrons and 15 neutrons. 1. Copper-60 2. Oxygen-15 3. Phosphorus-30 4. Sulfur-31 5. Silicon-30 6. Zinc-60 7. Phosphorus-31 8. Fluorine-15
Answer:
Phosphorus-30
Explanation:
In hyphen notation, the mass number is written after the name of the element. An element that has 15 electrons and 15 neutrons would also contain 15 protons. Since the mass number of an element is the sum of the protons and neutrons in an atom of that element, the mass number of this element is 30.
Also, the number of protons (or electrons for a neutral atom) present in an atom of that element is known as the atomic number of that element.
In the periodic table of elements, the element with atomic number 15 is phosphorus. Thus, phosphorus has 15 protons, 15 electrons and 15 neutrons. Its mass number = 30. In hyphen notation, it is written as: Phosphorus-30
1. Explain the evidence which suggests that the universe is expanding. 2. What is the Big Bang Theory and what does it propose? 3. In addition to evidence, which suggests that the universe is expanding, what other evidence supports the Big Bang Theory?
Answer:
1) The evidence that the universe is expanding can be explained by the observed redshifted light from distant galaxies which according to the evaluation means that the galaxies are in recession. The observation was explained by Hubble's law which stated that the rate of recession of the galaxies from the Earth is proportional to their away distance
2) The Big Bang Theory is a theory that scientists used to explain the origin of the universe. According to the big bang theory states that the universe started from an extremely high temperature and high density singular state that exploded and expanded over time to the the present day universe
3) Another evidence that supports the Big Bang Theory is the cosmic background radiation which is has its origin from the Big Bang
Explanation:
The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?
Energy is released when an electron moves to a higher energy level.
Smaller atoms have fewer spectral lines than larger atoms.
The energy of an electron increases with distance from the nucleus.
Electrons cannot exist in locations other than in specific orbits.
Answer:
d. Electrons cannot exist in location other than specific orbits.
What is precipitation?
the sweat from our bodies on hot days
the gas that we use in furnaces and ovens
any form of water that falls from the sky
warm rain, but not cold snow or sleet
Answer:
C!
Explanation:
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravity from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail.
Answer:Precipitation is water released from clouds in the form of rain, freezing rain, sleet, snow, or hail. It is the primary connection in the water cycle that provides for the delivery of atmospheric water to the Earth. Most precipitation falls as rain. Precipitation isn't always in the form of warm liquid. It also includes snow ,sleet ,hail ,and such.
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Select the correct answer.
Kylie places a cube of metal A and a cube of metal B in two separate beakers of water. Then she heats the beakers. She keeps the mass of metal, the amount of water, and the amount of heat the same. At the end of her experiment, she finds that metal A has a lower temperature than metal B. What can she conclude about the thermal properties of the two metals?
Metal B is a better conductor than metal A.
Metal A is a better conductor than metal B.
Metal A has a higher heat capacity than metal B.
Metal B has a higher heat capacity than metal A.
Answer:
Metal A has a higher heat capacity than Metal B.
Explanation:
To answer this question, we have to think about what happened and what we know about thermal properties of metals. We are talking about temperature and heat in this question, so we can already eliminate both answers that talk about the metals being a conductor, because conductivity is related to electricity. That's not what the question asks. So therefore, we know one metal must have a higher heat capacity than the other. Heat capacity is defined as the number of heat units needed to raise temperature by one degree. If metal A has a lower temperature than metal B, it must have a higher heat capacity, because it takes more heat to raise the temperature. This is because metal B has a higher temperature than metal A. Therefore, the correct answer is Metal A has a higher heat capacity than Metal B.
How is Osmosis related to diffusion?
GREETINGS!
Diffusion is a process in which gases or liquid move from higher concentration to lower concentration
Osmosis is a process of movement of water molecules from higher concentration to the lower concentration through semi permeable membrane
SIMILLARITIES OF DIFFUSION AND OSMOSIS
Diffusion and osmosis both are the processes in which molecules move from high concentration to the lower concentration, also they do not require any energy so they both are passive transport examples.
The only dissimilarity is that in osmosis there is semipermeable membrane which Checks the movement of the water molecules ONLY
HOPE THIS HELPS YOU!
calories
Nutrition Facts
1. How many calories are in one serving of this food? (Remember, all
the numbers on a nutrition fact label are for 1 serving of the food)
|
2. In one serving of this food, how many calories are from fat?
Serving Size 1/2 cup (about 829)
Servings Per Container B
Amount Per Serving
Calories 200 calories from Fat 130
Daily Value
Total Fat 149
22%
Saturated Fat 99
45%
Trans Fat og
Cholesterol 5mg
18%
Sodium 40mg
2%
Total Carbohydrate 173
6%
Dietary Fiber 10
4%
Sugars 149
Protein 3g
3. If you consumed the entire container of this food, how many
calories would you consume?
4. If you consumed the entire container of this food, how many
calories from fat would you consume?
Vitamin A 10% • Vitamin C 0%
Calcium 10% Iron 6%
Dalya alone
Song
Tea
20
25
7
Total Care
Page 1 of 10
Please answer today ASAP I need a answer
Fill in the blanks with the correct words.
The movement of molecules from an area of low concentration to an area of high concentration occurs in *blank*
transport
In *blank*
transport, molecules move from an area of high concentration to an area of low concentration.
Answer:
1st active transport
2nd passive transport
Explanation:
Which option is an example of a physical change?
A silver tarnishing
B iron rusting
C gasoline burning
D metal denting
Answer:
I believe the answer is metal denting
Explanation:
The other options are chemical changes.
Enjoy your winter break a few more days
An object weighing 89.7 g is
placed in a graduated cylinder
displacing the volume from
50.0 mL to 60.5 mL.
What is its density in g/cm3?
[?] g/cm3
Answer:
The answer is 8.54 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
volume = final volume of water - initial volume of water
volume = 60.5 - 50 = 10.5 mL = 10.5 cm³
We have
[tex]density = \frac{89.7}{10.5} \\ = 8.5428571...[/tex]
We have the final answer as
8.54 g/cm³Hope this helps you
A scientist discovers a new organism and is trying to classify it. Which observation would most likely indicate that the organism is an animal? ~:)
Answer:
whether it is heterotrophic
2020 edg
What does the release or absorption of energy indicate?
A chemical change
B neither physical nor chemical changes
C physical change
D physical and chemical changes
Answer:
k Nishant
Explanation:
i think only chemical change
Answer:
chemical change release energy but physical change absorb energy
The formation of which product(s) will most likely be observed in a combustion reaction?
an oxide
one element and one compound
an element
two ionic compounds
Answer:
an oxide
Explanation:
A just took the quiz on edg
The formation of oxide as product will most likely be observed in a combustion reaction.
What is combustion reaction?A combustion reaction was a reaction where a substance combines with oxygen gas to produce energy in term of light as well as heat.
What is oxide?Chemical compounds called oxides include one or even more oxygen atoms including another element.
When propane is burned in the air, carbon dioxide, as well as water, is produced.
Therefore, the correct answer will be option (A).
To know more about combustion reaction .
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how is leachate formed in phytoextraction?
Answer:
As precipitation percolates though decomposing organic waste (Justin and Zupancic, 2009), leachate is produced. ... Phytoremediation systems are used in constructed wetland treatment systems to detoxify, degrade, and inactivate potentially toxic elements in leachate (Jones et al., 2006)Explanation:
[tex]hii[/tex]have a nice day ✌️✌️Answer:
i think its used much by humans but they don't know it harmfull to humans
The largest element that forms a +3 ion?
Answer:
aluminum ion & iron (III) ion
In an experimental investigation, the group that is not manipulated by the researcher and is then compared to the experimental group is called the blank? group.
Answer:
The correct answer is - the control group.
Explanation:
The control group is one of two groups that are present in any investigation or experiment which is not getting any treatment as the experimental group gets. It remains constant or in natural conditions instead of influenced by any treatment or factor.
An experimanetal group that is manipulated by the researcher by the independent variable is compared to The control group to see the differences developed by the manipulation or influence.
A word for material deposited on a filter
Sediment filter
Sediment is any particulate matter that can be transported by fluid flow and which eventually is deposited as a layer of solid particles on the bed or bottom of a body of water or other liquid. Sedimentation is the deposition by settling of a suspended material.
The overall charge of a formula unit for an ionic compound ____.
Group of answer choices
A.is always zero (neutral)
B.it is always positive
C.is always negative
D.it may have any value
PLEASE HELPP
will give extra points
Answer:
Answer is A, because inoic bonds are made of Positive and Negative ions, lets take example of NaCl, Since an ionic compound consists of equal number of positive and negative ions, the overall charge of an ionic compound is zero, If it wouldnt be zero there would be any charge on NaCl.
Answer:
A. Is always zero (neutral)
Explanation:
from Google
hope it helps it is old question but I want to write the right answer
density is
A) the amount of mass in an object
B) the amount of mass in a given amount of space
C) the amount of space an object takes up
D) the weight of an object
Answer:
A)
Explanation:
the the amount of mass in the object
Answer:
b
Explanation:
Density is a measure of mass per volume. The average density of an object equals its total mass divided by its total volume. An object made from a comparatively dense material (such as iron) will have less volume than an object of equal mass made from some less dense substance (such as water).
A student heats a test tube containing a large amount of protein and biuret reagent. She notices a color change from violet to blue. Explain why heating causes a color change
Answer:
Explanation:
Proteins are formed from amino acids that are held together by peptides bonds. We have excess of protein present with Biuret reagent which is a combination of sodium hydroxide(NaOH) and copper sulfate(CuSO4)
The normal color of biuret reagent is blue but when we have protein present in biuret reagent its color will be Violet and when we heat this the protein present in it will gain molecular energy disrupting the peptides bonds present as a result the color changes now to blue which is the original color of the biuret solution this happened because biuret test was used to detect proteins or peptide bond specifically but now they are disrupted hence the color change.
Force must be applied to initiate motion
for an object in:
A.all of the above
B.earth's atmosphere
C.outer space
D.the ocean
Force must be applied to initiate the motion of an object on earth's atmosphere, outer space and the ocean.
According to Newton's second law of motion, the force applied to an object is directly proportional to the product of force and acceleration of the object. The object tends to move in the direction of the applied force.
The formula for this law is written as follows;
F = ma = mg
where;
m is the mass of the objectg is acceleration due to gravity
Due to influence of acceleration due to gravity on objects, a force must be applied to initiate the motion of object located within the places where gravity is felt.
Learn more here:https://brainly.com/question/18801986
As the temperature of a given sample of a gas decreases at constant pressure, the volume of the gas
As the temperature of a given sample of an ideal gas decreases at constant pressure, the volume of the gas: increases in accordance with Charles's law.
Charles law states that when the pressure of an ideal gas is kept constant, the volume of the gas is indirectly proportional to the absolute temperature of the gas.
Mathematically, Charles law is given by the formula;
[tex]\frac{V}{T} =k[/tex]
Where;
T is the temperature of an ideal gas.V is the volume of an ideal gas.According to Charles's law, when the volume of an ideal gas is decreased at a constant pressure, the temperature of the gas is increased and when the volume of a gas is increased at a constant pressure, the temperature of the gas is decreased due of the inverse relationship existing between them.
In conclusion, the temperature of a gas decreases the volume occupied by a gas provided pressure is kept constant in accordance with Charles's law.
Read more: https://brainly.com/question/22971882
Which correctly lists three forms of frozen water?
dew, frost, rain
frost, hail, sleet
hail, rain, sleet
rain, dew, frost
Answer:
frost, hail, sleet
Explanation:
Answer:
its the second answer
Explanation:
Which compound would you expect to have greater surface tension, acetone [(CH3)2CO] or water (H20)? Explain.
es)
A)
Acetone. This molecule has more instances of hydrogen bonding then
water
B)
Water. Surface tension increases with increasing intermolecular forces, and
water can hydrogen bond while acetone cannot.
Acetone. Surface tension increases with increasing intermolecular forces.
They both can hydrogen bond but acetone molecules are larger creating
stronger London dispersion forces.
Water. Surface tension increases with increasing intermolecular forces.
They both can hydrogen bond but water molecules due to their shape, can
pack more tightly and stick together easier.
D
Surface tension increases by increasing the intermolecular forces.
The following information should be considered:
In the compounds water contains the hydrogen bonding interactions along with dispersion forces.These hydrogen bonding interactions are not seen in the acetone which has only dispersionSo, water has the greater surface tension as compared to acetone.Learn more: https://brainly.com/question/2386757?referrer=searchResults
The elements on the Periodic Table are arranged by ________________.
Answer:
n a periodic table arranged in order of increasing atomic number, elements having similar chemical properties naturally line up in the same column
Explanation:
atomic mumber
bc it just is now su
How does Astronomy work
Answer:
An astronomer is a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth. They observe astronomical objects such as stars, planets, moons, comets and galaxies – in either observational (by analyzing the data) or theoretical astronomy.
Recommendation:
Please mark it BrainliestWhat is the mass percent of a sugar solution having 15 g sugar dissolved in 63 g of solution?
Answer:
23.81%
Explanation:
The mass percent of a solution, also known as percentage by weight or w/w%, can be calculated using the formula:
mass percent = (mass of solute / mass of solution) x 100%
In this question;
Mass of solute (sugar) = 15g
Mass of solution (sugar + water) = 63g
Hence,
w/w% = 15/63 × 100
w/w% = 0.2381 × 100
w/w% = 23.81%
Therefore, the mass percent of the sugar solution is 23.81%.