Answer:
[tex]\boxed {\boxed {\sf A. \ Change \ in \ state \ of \ matter}}[/tex]
Explanation:
A physical change occurs when only the physical properties change. They are generally reversible and no new substances are formed.
However, in a chemical change, the chemical structures and properties change, plus new substances are formed.
Let's analyze each answer choice.
1. Change in state of matter
The state of matter is a physical property, so this is a physical change.
2. Precipitate was formed
A precipitate is a solid formed in a liquid solution. This is a new substance and a chemical change.
3. Unexpected change in odor.
A change in odor is a sign of chemical change.
4. Formation of bubbles
Bubbles signify the formation of gas or a new substance.
So, the best answer choice is A. change in state of matter
Question:
Which of the following would be the evidence of a physical change?
a. change in state of matter
b. precipitate was formed
c. unexpected change in odor
d. formation of bubbles
Answer:
A. Change in state of matter!
Explanation:
How to know it evidence of physical change!
EXPECTED color change.Change in SIZE or SHAPE.Change in state of matter.Reversible.No NEW substance formed!What happens when a person moves from a place with low gravity to a place
with high gravity?
A. Her weight increases.
B. Her weight decreases.
C. Her mass decreases.
D. Her mass increases.
Answer:
B if I'm not mistaken
hduekke
Answer:
A I think
Explanation:
You weigh more in more gravity
What are three properties of electromagnetic waves? They travel slower than the speed of light, they include visible light waves, and they can transfer energy through empty space. They need matter through which to travel, they travel at the speed of light, and they include visible light waves. They travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space. They include ultraviolet waves, they need matter through which to travel, and they travel slower than the speed of light.
Answer:
its c
Explanation:
They travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space. Hence, option C is correct.
What is an electromagnetic wave?An electromagnetic wave (radiation) can be defined as a type of wave that does not require any medium for its propagation. Also, light energy is a good example of an electromagnetic wave (radiation).
Electromagnetic waves are used in science as a propagating medium used in all communication processes device to transmit data from the device of a sender to the device of the receiver.
Hence, they travel at the speed of light, they include ultraviolet waves, and they can transfer energy through empty space.
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1) LIOH + HBr à LIBr + H2O
If you start with 5mol of lithium hydroxide, how many moles of lithium
bromide will be produced?
Identify this reaction
In pic
Answer:
Double displacement
Explanation:
what is the formula mass of MgO (how much does one mole of it weigh)
Answer:
40.3044 g/mol
Explanation:
hope this helps
2 points
2.7 x 10-2 grams of Pb(C2H302)4 are dissolved to make 3.5 mL of
solution. What is the molarity?
Your Answer
Answer:
The molarity is 0.0174 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molarity (M) or Molar Concentration is the number of moles of solute that are dissolved in a certain volume.
The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.
[tex]Molarity=\frac{number of moles of solute}{volume of solution}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
In this case, being the molar mass of compound Pb(C₂H₃O₂)₄ equal to 443.38 g / mol, then the following rule of three can be applied: if 443.38 grams are contained in 1 mol, 2.7*10⁻² grams in how many moles they are present?
[tex]amount of moles=\frac{2.7*10^{-2} grams*1 mol}{443.38 grams}[/tex]
amount of moles= 6.09*10⁻⁵ moles
Being 1,000 mL= 1 L, then 3.5 mL= 3.5*10⁻³ L
So:
[tex]Molarity=\frac{6.09*10^{-5} moles}{3.5*10^{-3} L}[/tex]
Solving:
Molarity=0.0174 [tex]\frac{moles}{liter}[/tex]
The molarity is 0.0174 [tex]\frac{moles}{liter}[/tex]
Which of these is a rock commonly found in oceanic crust?
A basalt
B. granite
C. magnesium
D. iron
Answer:
B. Granite
Explanation:
The continental crust is thicker, 30 km (20 mi) to 50 km (30 mi) thick. It is mostly made of less dense, more felsic rocks, such as granite.
What does the MC1R gene code for
Answer:
The MC1R gene provides instructions for making a protein called the melanocortin 1 receptor. This receptor plays an important role in normal pigmentation. The receptor is primarily located on the surface of melanocytes, which are specialized cells that produce a pigment called melanin.
Explanation:
#hope this help
6. A car is driving in a large circle at a constant speed of 20 miles per hour. Is the car accelerating? How do you know?
The car is not accelerating, because the car is driving at a constant speed of 20 miles per hour.
Don’t mind my cats fur :)
Answer:gas formation
Explanation:
Answer:
gas information The Monroe Doctrine was a United States policy that opposed European colonialism in the Americas. It argued that any intervention in the politics of the Americas by foreign powers was a potentially hostile act against the United States.[1] It began in 1823; however, the term "Monroe Doctrine" itself was not coined until 1850.[2]
U.S. President James Monroe
Secretary of State John Quincy Adams, author of the Monroe Doctrine
The Monroe Doctrine was issued on December 2, at a time when nearly all Latin American colonies of Spain and Portugal had achieved, or were at the point of gaining, independence from the Portuguese and Spanish Empires. It stated that further efforts by various European states to take control of any independent state in the Americas would be viewed as "the manifestation of an unfriendly disposition toward the United States."[3] At the same time, the doctrine noted that the U.S. would recognize and not interfere with existing European colonies nor meddle in the internal affairs of European countries.
President James Monroe first stated the doctrine during his seventh annual State of the Union Address to the Congress. The doctrine asserted that the New World and the Old World were to remain distinctly separate spheres of influence.[4] The separation intended to avoid situations that could make the New World a battleground for the Old World powers so that the U.S. could exert its influence undisturbed.[5] By the end of the 19th century, Monroe's declaration was seen as a defining moment in the foreign policy of the United States and one of its longest-standing tenets. The intent and impact of the doctrine persisted more than a century, with only small variations, and would be invoked by many U.S. statesmen and several U.S. presidents, including Ulysses S. Grant, Theodore Roosevelt, John F. Kennedy, and Ronald Reagan.
After 1898, the Monroe Doctrine was reinterpreted in terms of multilateralism and non-intervention by Latin American lawyers and intellectuals. In 1933, under President Franklin D. Roosevelt, the U.S. went along with this new reinterpretation, especially in terms of the Organization of American States.[6]
which part of a star does the star’s energy come from?
Answer:
For most of its active life, a star shines due to thermonuclear fusion of hydrogen into helium in its core, releasing energy that traverses the star's interior and then radiates into outer space. At the end of a star's lifetime, its core becomes a stellar remnant : a white dwarf , a neutron star , or, if it is sufficiently massive, a black hole .
Explanation:
Answer:
its nuclear fusion
Explanation:
Urgent!
which element do you think has a greater mass? cadmium or zinc?
Answer:
zinc
Explanation:
Answer:
cadmium has a greater mass.
explanation:
zincs mass: 65.38
cadmiums mass: 112.411
_____ grams = 9.3 kilograms
Answer:
9300 grams = 9.3 kilograms hope it helps
As one object gets closer to another object , the force of gravity will increase ......
True or false
Answer:
true
Explanation:
hope that helped!!
What is the muscle that when contracted, it allows the lungs to fill with air?
Answer:
It is a large, dome-shaped muscle that contracts rhythmically and continually, and most of the time, involuntarily. Upon inhalation, the diaphragm contracts and flattens and the chest cavity enlarges. This contraction creates a vacuum, which pulls air into the lungs.
Explanation:
Answer:
Explanation:
The muscle that is contracted, it allows the lungs to fill with air through diaphragm muscle.
Hope it helped you.
An effective treatment for some cancerous tumors involves irradiation with "fast" neutrons. The neutrons from one treatment source have an average velocity of 3.5×107 m/s. If the velocities of individual neutrons are known to within 2.0% of this value, what is the uncertainty in the position of one of them?
Answer:
4.54 * 10^-14 m
Explanation:
From Heisenberg's uncertainty principle, we can write;
Δp.Δx ≥ h/4π
Given that;
Δp =Δmv
So;
Δmv.Δx ≥h/4π
Δmv =2/100(3.5×10^7 m/s * 1.66 * 10^-27)
Δmv =1.162 * 10^-21 Kgms-1
Δx ≥6.63 * 10^-34 /4 * 3.142 * 1.162 * 10^-21
Δx ≥4.54 * 10^-14 m
what color should i paint my nails. btw ima do a cheetah design on top so what should be the base color??
Answer:
Tan :3 or maybe a yellow O,O
Explanation:
Answer:
pink and purple, like in fade
Explanation:
I think it'd look cute
How many atoms of hydrogen are found in the compound, NH4C2H302?
7 hydrogen atoms
Explanation:
NH4C2H302
In this problem we see the hydrogen atom twice, along with the numbers 4 and 3 next to them. (as shown above in bold & underlined)
So, in order to find how many there are in all you add both hydrogen atoms together-
H4+H3= H7
therefore, there are 7 hydrogen atoms in all
A sample of carbon monoxide gas occupies 224 L at STP. This sample contains how many grams of oxygen atoms?
Answer:
16 g.
Explanation:
The formula for carbon monoxide is CO.
So there is one atom of oxygen in the formula, therefore there is one mole of oxygen gas ( one mole occupies 22,4 L at STP)
One mole of oxygen atoms = atomic mass of oxygen in grams = 16 grams.
What are the correct coefficients for the unbalanced equation below?
P4 +02 → P2O5
A)1,1,1
B) 1,3,1
C)1,5, 2
D)2,1,2
E)none of the above
PLEASE EXPLAIN WHY! I will mark the brainliest!
Answer:
C; 1, 5, 2
Explanation:
First, we do atom inventory:
Think of the arrow as a divider
On the left side, we have 4 phosphorus and 2 oxygens
On the right side, we have 2 phosphorus and 5 oxygens
Now we try to balance:
To make it easier, we want to try and make the 5 oxygens get to an even number so, we put a 2 in front of the P2O5 which makes it 2P2O5
Since we put a 2 in front of the P2O5, we have to multiply our phosphorus and oxygen on the right side by 2, which brings us to now have 4 phosphorus and 10 oxygens.
So now the oxygens are unbalanced.
To balance the oxygens, we put a 2 in front of the O2 located on the left side which makes us multiply our oxygen by 5, making it now 10.
Final result:
We end up having P4 + 5O2 = 2P2O5
(1, 5, 2)
Study the image. Warm and cold air fronts with points labeled 1 through 4. 1: cold air entering from the left and moving down. 2: clouds with rain. 3: warm air entering from the right and moving up. 4: warm air entering from the top left and moving down toward the clouds. Warm and cold air fronts with points labeled 1 through 4. 1: cold air entering from the left and moving down. 2: clouds with rain. 3: warm air entering from the right and moving up. 4: warm air entering from the top left and moving down toward the clouds. At which point is cool air circulating beneath warm air? 1 2 3 4
Answer:
1
Explanation:
Warm and cold air fronts with points labeled 1 through 4, cold air entering from the left and moving down. Therefore, the correct option is option 1.
What is air?The term "air" is used to refer generally to the concoction of gases that composes the Earth's atmosphere. Nitrogen makes up the majority of this gas (78%), with oxygen, water vapor, argon, carbon dioxide, and trace gases also present.
There is no color or smell in pure air. Dust, pollen, and spores are common airborne contaminants; additional pollutants are alluded to as "air pollution." Since there isn't air in space, the so-called air on another planet, like Mars, would have different manufacturer. Warm and cold air fronts with points labeled 1 through 4, cold air entering from the left and moving down.
Therefore, the correct option is option 1.
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If a 67.3G rock is dissolved in 2.00L of acid, what is the molar concentration of gold in the acid solution
Answer:
[Au] = 0.171 M
Explanation:
For this question, we assume the rock is 100 % gold.
First of all, we determine the moles of gold
67.3 g . 1mol/ 196.97g = 0.342 moles
Molar concentration is defined as the moles of solute, contained in 1L of solution.
Our solution volume is 2L.
M = 0.342 mol / 2L = 0.171
Molar concentration, also called molarity of solution is the most typical unit of concentration.
Most chemical reactions have what
Answer:
The first one
Explanation:
Hope it helps
Answer:
I think it would be: have starting substances that collide with each other
Explanation:
Two or more reactants interact to create different substances called products.
how many valence electrons does oxygen have
Answer:
Six valence electrons!!
Explanation:
Hope this helps!!
The diagram shows a position (person) on Earth at 3:00 a.m. What is likely to happen to that position (person) in 12 hours? Select the best answer.
A. It will remain stationary.
B. It will rotate and be in the sun.
C. It will rotate and return away from the sun.
B.It will rotate and be in the sun.
Which BEST describes the type of bonding that occurs in potassium chloride (CI)?
mostly ionic
O mostly covalent
metallic and ionic
O metallic and covalent
ASAP quick
Answer:
A. mostly ionic
Explanation:
Chemical bonding is the process that links elements together to form compounds
You are watching the Indy 500 car race on television with your brother. He says, "Did you know that these cars race at a speed of over 200 mph? That velocity is amazing!" Having learned that speed and velocity are not the same, you decide to explain the difference to your brother.
Answer:
See explanation
Explanation:
All physical quantities are broadly classified into scalar quantities and vector quantities.
Scalar quantities have magnitude but do not have direction. Vector quantities have both magnitude and direction. Hence the main difference between a scalar quantity and a vector quantity is that a vector has direction while a scalar quantity does not.
Speed is a scalar quantity while velocity is a vector quantity. You have just specified a magnitude of 200 mph without mentioning its direction. This implies that you are referring to speed of the cars in the race and not velocity because velocity of the cars must indicate the direction!
temperature is defined as the average kinetic energy of the molecules. what is the temperature reading when all molecules completely stop vibrating?
A.0 degrees F
B. 0 degrees C
C.0 degrees K
D.273 degrees K
Answer:
Temperature is the average kinetic energy of the molecules. Absolute zero is the temperature where molecular motion stops and is the lowest possible temperature. ... The relationship between Celsius and Kelvin temperature scales is given by K = °C + 273.15.5
so the answer is B
MARK ME A BRAINLIEST
I WILL GIVE 50 POINTS AND BRAINLIEST What is the volume of 41.2g argon at stp???
Answer:
1645.86
Explanation:
how many moles are in 425g of KNO3?
Answer:
The answer is 101.1032
Explanation: