Answer:
Now eating can change food both physically and chemically. Once your spit touches the food chemicals in the saliva begin to change the food chemically.
Explanation:
Answer: It made you not hungry anymore and filled you up. It also helped your brain be more focused.
Explanation:
A physical change is a change that doesn't create a new substance or change the substance. Usually this involves a size or shape change. ... A chemical change is a change that creates a new substance or changes the substance. Usually, this involves color change, temperature change, and/or a new substance being formed.
hope this help luv
HELP ASAP!! 15 PTS!! Match each of the unknown ions to its appropriate description.
1. B+
2. A−
3. D2+
4. C2−
a. A nonmetal that gained one electron
b. A metal that lost one electron
c. A nonmetal that gained two electrons
d. A metal that lost two electrons
Answer:
1 and a
2 and b
3 and c
4 and d
Explanation:
+ = gained
- = lost
when there is a two it has two electrons
I also had a high school friend check my accuracy
HOPE THIS HELPS!!!! :)
<3333333333
Answer:
The answer above is wrong. Under explanation it is correct.
Explanation:
1. c
2. b
3. a
4. d
I took my test and got it wrong using above answers, but these are correct! ; /
Classify the following pieces of matter:
bronze
pure water
tap water
trail mix
Answer:
bronze - solid
pure water - liquid
tap water - liquid
trail mix - solid
Explanation:
There are 4 classes of matter based on the characteristics of their molecules:
SolidsLiquidsGasesPlasmaThe molecules in solids are tightly packed together and are more or less fixed about a point with very little of no movement. The molecules in liquids are less tightly packed and are able to take the shape of their containers. The molecules in gases are loosely packed and compressible. They can take the shape of containers as well as expand to a container due to their loosely packed molecules.
Plasma molecules neither have shape nor volume but are able to produce both magnetic and electric currents as well as respond to electromagnetic fields.
Hence bronze has all the characteristics of a solid, pure and tap water both have the characteristics of a liquid, while trail mix can be considered a solid.
Something about chemistry, is there such thing of mixing items to create medicine. If so what is it called? Medical chemistry?
Answer:
Drug compounding is often regarded as the process of combining, mixing, or altering ingredients to create a medication tailored to the needs of an individual patient.
An ideal gas with γ = 1.67 has an initial temperature of 0°C, initial volume of 10.0 liters, and initial pressure of 1.00 atm. Then the gas is expanded adiabatically to a volume of 10.4 liters. What is the new temperature? (1 point)
Answer: T = 9.74°C
Explanation: An ideal gas in a quasi-static adiabatic process follows the equation: [tex]pV^{\gamma} = constant[/tex].
So:
[tex]1.10^{1.67} = constant[/tex]
constant = 46.7735
Adiabatic conditions can be written as:
[tex]TV^{\gamma-1}=constant[/tex]
Then, new temperature is
[tex]T.(10.4)^{1.67-1}=46.7735[/tex]
[tex]T.(10.4)^{0.67}=46.7735[/tex]
[tex]T = \frac{46.7735}{4.802}[/tex]
T = 9.74°C
The new temperature is 9.74°C.
a certain gas occupies 5 dm³ at 24 °C and 15 cm Hg. Calculate the pressure of the gas if the volume is halved and the temperature is raised to 200°C.
Explanation:
(P1V1)/T1=(P2V2)/T2
(15X5)/297=(p2x2.5)/473
p2=47.78cmHg
If the pressure of a 2.00 L sample of gas is 50.0 kPa, what pressure does the gas exert if its volume is
decreased to 20.0 mL?
Which equation should you use?
V1 V2
T1 T2
P1V1 = P2V2
V1 V₂
N1 N2
Answer: P1V1 + P2V2
Explanation:
2. The model on the right looks bumpy, but when you break a large salt crystal in two, the edges of the split often look straight and feel smooth. Is there a problem with the model?
Answer:
Maybe the sizes are too big which means that they need to be smaller because the more compact they are the more smooth and straight they will be because when they are too big it is easier to break them which would lead to a bumpy surface.
Explanation:
I don't know :)
he Solids model formed by atoms as solid spheres for macroscopic measurements, the model has no problems, because the atoms are extremely small
Dalton's atomic model was the first scientifically based model formulated in 1808, it consists of atoms with spheres that cannot be divided and solids are formed by contact between the spheres and chemical compounds are formed by joining atoms of two or more elements, this model is used to approximate solids such as solid spheres there are today.
The size of these spheres (atoms) is very small, nowadays it is known that it is of the order of 10⁻⁹ m, therefore, having a macroscopic crystal more than 10⁻⁶ m in length, it is impossible to measure fluctuations in the sizes of the spheres, since there are 10⁹ spheres in this volume, therefore it is not possible to measure the fluctuations with instruments,
To be able to measure this fluctuation, very small samples and very high resolution transmission microscopes are needed.
In conclusion, the model of the atom as solid spheres for macroscopic measurements, the model has no problems.
Learn more about solids here:
https://brainly.com/question/2194117
Which skill involves creating representations of complex objects or processes? A. classifying B. predicting C. making models D. evaluating (this is probably really easy, but my mind is going blank)
Answer:
C. making models
Explanation:
Making models facilitates constructing depictions of complex objects or practices that enable students to practice and understand how things work which can not be observed and measured directly. Model making needs abstract thinking about the tools and material used, spatial thinking, and well-organized idea of the project to create complex objects.
how many grams of oxygen are in 25 grams of sugar?
Answer:
13 grams of Oxygen
Explanation:
Step 1: Find molecular formula of sugar
C₁₂H₂₂O₁₁
Step 2: Convert moles of oxygen present to grams
1 mol O = 16 g O
11 mol O = 176 g O
Step 3: Find molar mass of sugar
C - 12.01 g/mol
H - 1.01 g/mol
O - 16.00 g/mol
12.01(12) + 22(1.01) + 11(16.00) = 342.34 g/mol C₁₂H₂₂O₁₁
Step 4: Set up dimensional analysis
[tex]25 gC_{12}H_{22}O_{11}(\frac{176 gO}{342.34gC_{12}H_{22}O_{11}} )[/tex]
Step 5: Multiply/Divide and cancel out units
Grams of C₁₂H₂₂O₁₁ and grams of C₁₂H₂₂O₁₁ cancel out.
We are left with grams Oxygen
25/342.32 = 0.073031(176) = 12.8535 grams Oxygen
Step 6: Simplify
We only have 2 significant figures in this problem. Thus,
12.8535 = 13 g O
What has more kinetic energy, the floor or a computer?
Answer:
Computer.
Explanation:
The computer is moving more than the floor, at least, it's moving when people are typing on it.
Return all unused chemicals to their original containers true or false
Answer:
no
Explanation:Unused chemicals are never returned to their original containers because you will be contaminating the chemical. Dispose of unused chemicals in the proper containers.
Which of the following numbers has three significant figures?
all of the choices
1000 yards
1014 miles
101 feet
Answer:
The correct answer is 101 feet.
Explanation:
To solve this problem, we need to remember the rules of significant figures. Any digit that is not zero is significant, and any zero is significant if it is between two non-zero digits or a trailing zero after the decimal point. Now, let's apply these rules to the options that are given:
1000 yards - Since the zeros are not after the decimal point or between two other digits, they are not significant. This means the only significant digit is 1, so there is only 1 significant digit.
1014 miles - All three of the non-zero digits are significant, and the 0 is significant in this case because it is between two other significant digits. Therefore, this number has 4 significant digits.
101 feet - The two 1's are significant because they are non-zero digits, and the zero is also significant because it is between the two 1's. Therefore, this number has 3 significant digits.
Thus, your answer is 101 feet.
Hope this helps!
Which of the following are examples of plasmas?
Answer:
i will tell some examples of plasmas they are:
1.lightning
2.solar wind
3.welding arcs
4.stars(including the sun)
5.the earths's ionosphere
Answer: which of the following are examples of plasmas?
Choices: 1. Ice cubes 2. Tails of comets 3. A gas fire 4. The ionosphere 5. A neon sign 6. A flashlight
Explanation:
The Answer: is 2. Tails of comets 4. The ionosphere 5. A neon sign
A scientist placed a sample of lithium into a container of water. The scientist observed the lithium floating and making a buzzing sounf ad gas bubbles were forming arounf it. Which conclusion is BEST supporter by this observation? A) Dissolved gases were released. B) A chemical change took place. C) Water was vaporized. D) The lithium was dissolved by the water.
Answer:
b
...................
Answer:
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Explanation:
ncs njevt hibveynvuirn2uivnwru8cnajoncuiwrnf24nvojwnvojwnfjr2nfln24f8u1elkcjo2joc2rjkf
Convert 186282 miles hour into meters per second
Answer:83275.50528m/s
Explanation:
which should I choose?
Answer:
liquid
Explanation:
thank me
what is the latin name for this plant
Answer:
plantae
Explanation:
if you look up the Latin it says plantae
Answer:
"Cactus", wich is a member of the plant family Cactaceae.
gold has a density of 19.3 g/ml. if you have 4.0 grams of gold, what is the volume of the sample
Answer: The volume is 37.0 cm3Au
Explanation:
Answer:
4.825 mL
Explanation:
19.3 g/mL * 1/4.0 g = 4.825 mL
Q1: What problem did the development of the metric system solve? Write your answer below!
Answer:
It solved the issue of depending on too many base units
Explanation:
It was first adopted by the French government. Metric system was developed by Gabriel Mouton of Lyons, he is called the founding father of the metric system. He proposed the decimal system of measurement that was refined by the scientists.
The metric system is simple for making measurements, you just need to know few metric units. There are seven base units in this system of measurement while there are twenty base units in inch-pound system of measurement. Metric system is easier to remember. The metric system follows the decimal number system and it decreases and increases in size by 10.
It has been adopted by all the countries of the world except Myanmar and US.
PLZ HELP!!! ILL MARK BRAINLIEST!!! You read an article written by an amateur ghost hunter. It includes the following paragraph. I spent one night in the home. As soon as I entered it, I got a sudden chill, as if someone didn’t want me there. As I walked through the hall, I felt a heavy presence all around me. I measured a large amount of energy coming from the upstairs bedroom. I believe there is a ghost in the home. This ghost hunter claims that there is a ghost in the home. Is this a scientific claim? Why or why not?
No, it is not a scientific claim. If a ghost hunter catches a voice on video like ghost hunters do you can either believe it or not. Ghosts are more of a i believe it you dont have to type of thing becasue they have not been scientifically proven to exist.
A rock occupies a volume of 20.0 cm3 and has a mass of 54 grams. What is its density?
Answer:
Density = 2.7 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]Density = \frac{mass}{volume} [/tex]From the question
mass = 54 g
volume = 20 cm³
Substitute the values into the above formula and solve for the density
That's
[tex]Density = \frac{54}{20} [/tex]We have the final answer as
Density = 2.7 g/cm³Hope this helps you
Select True or False.
Social Security is normally paid out in the lump payment upon  retirement
Answer:
TRUE MY DOOD
Explanation:
What is the connection between Archimedes and the Mass-Volume lab
Answer:
Explanation:
This question is not very clear, however, going by the key words in the question, Archimedes' principle shows a relationship between mass and volume.
Archemedes' principle states that when a body is fully or partially immersed in fluid, it is acted upon by an upward force which is equal to the weight of the fluid displaced by the body.
The volume displaced here can be determined using the formula
Density of liquid = mass displaced ÷ volume
Hence, volume = mass displaced ÷ density of liquid
What is the mass of 15 moles of carbon atoms? Round your answer to the nearest hundredth
In order to convert the moles of a substance to grams, you will need to multiply the mole value of the substance by its molar mass. More commonly written for this application as: where, is the molar mass of the substance.
Hope this helped
:)
Round 1047.78 to three sig figs
105
100
1030
The number after rounded upto 3 significant figures is 1050.
We have a decimal number.
We have to round it up to 3 significant figures.
What are Significant Figures ?The term significant figures refers to the number of important single digits (0 through 9 inclusive) in the coefficient of an expression in scientific notation.
According to the question, We have -
A = 1047.78
1047.78 (the original number has 6 significant figures)
The number after rounding up to three significant figures will be -
1050 (rounded to 3 significant figures)
Hence, the number after rounded upto 3 significant figures is 1050.
To solve more questions on Significant figures, visit the link below-
https://brainly.com/question/4997656
#SPJ2
Please answer asap!! how does the density of an object identify the material the object is made from?
Answer:
If you were to divide any object into small pieces of unit volume, the density would be the mass of each small piece. Everything is made up of molecules, which in turn are made up of atoms. So every object is created from the aggregation of atoms and molecules.
:)
Is Coca Cola a homogeneous mixture
Answer:
Yes
Explanation:
Coca Cola is a homogenous mixture, just like sugar, salt, and more. Hope this helps!
Answer: Yes
Explanation: Coca cola is a homogeneous mixture because the syrup and water are mixed evenly throughout the solution. For example, an unopened soda in a bottle has a uniform composition and is a homogeneous mixture. Once you open the bottle, bubbles appear in the liquid. The bubbles from carbonation are gasses, while the majority of the soda is liquid. An opened can of soda is an example of a heterogeneous mixture.
Hope this helps^^
How does increased temperature affect the amount of salt, carbon, and other substances able to dissolve in the ocean? What are the resulting effects?
Answer:
For solid salts that are soluble in the sea water, as the sea water temperature rises, the solubility of the salt in the water increases. The accompanying increase in the kinetic energy of solvent water molecules with the increase in the temperature of the seawater results in the increase in the number of solute salt inter-molecular bonds being broken by the energetic solvent molecules resulting in increasing solubility of the solids
However, for gases, the increase in temperature of the sea water results in a decrease in the solubility of all gases. The process is also explainable by the kinetic theory such that a rise in temperature of the gas seawater solution increases the kinetic energy of both the solvent water and the solute gas. The higher energy gases are moving much faster and are then then able to separate from the less mobile liquid gas combination.
The resulting effects
1) The surface (topmost) hotter portions of the sea have fewer living organisms
2) Fishes that come to the surface frequently gas for air by bringing their head above water
3) Most of the life forms are located deep within the sea
4) Formation of water movement cycles within the ocean and polar water bodies
5) Mechanical nature of the sea compared to fresh water bodies
Explanation:
PLZ HELP!!! ILL MARK BRAINLIEST!!! Would you consider the practice of "ghost hunting” to be closer to science or pseudoscience, based on the information provided in the article? Provide two examples to support your answer.
Answer:
I would consider the practice of "ghost hunting” to be closer to pseudoscience than science because the work described in the article mostly lacks process and is subjective. In the article, people looking for evidence of ghosts do not set up controlled experiments with repeated trials. Instead, they take several measurements and make guesses about what might be causing the results they see. The people in the article also base conclusions on observations such as feeling a "heavy presence” or a "sudden chill.” These are subjective observations.
Explanation:
Answer:I would consider the practice of "ghost hunting” to be closer to pseudoscience than science because the work described in the article mostly lacks process and is subjective. In the article, people looking for evidence of ghosts do not set up controlled experiments with repeated trials. Instead, they take several measurements and make guesses about what might be causing the results they see. The people in the article also base conclusions on observations such as feeling a "heavy presence” or a "sudden chill.” These are subjective observations.
Explanation:
Question 2
How many significant figures does the number have?
23.0702