We know that a chemical reaction has occurred by the appearance of a solid, evolution of a gas or change of color.
What is a chemical reaction?A chemical reaction refers to an interaction between reactants which leads to the formation of a product. A chemical reaction is represented using a chemical reaction equation.
We know that a chemical reaction has occurred when new substances appear in the system. This is signaled by the appearance of a solid, evolution of a gas or change of color.
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If the molecules of a substanace spread out compltely to fill the entire shape of any container the substance is placed in , the substance is probly a
Answer:
Gas.
Explanation:
Matter can be found in nature in three states: solid, liquid, and gas. The main difference between these three states is the separation of its molecules.
A solid has a definite form, its molecules are closely packed together and there is little to no movement between each molecule. When put in a container, it retains its form.
A liquid does not have a definite form, its molecules can move past another and they are not as close as in a solid, but it is not as loose either. When put in a container, it takes the shape of the container but it has a defined surface.
A gas does not have a definite form, its molecules are totally free from one another and the distance that separates them is much larger than the size they have. When placed in a container, they spread out completely and fill the entire shape of the container.
Why is the wavelength of 633 nm used to analyze the standard solutions and drink samples?
Answer:
Corresponding with orange light, is the wavelength that blue solutions absorb the most.
Explanation:
If light is diffused through a solution of a given color, emerges of light from another wavelength is consumed and fades away. However, the wavelength of light relating to the color of such a solution is transferred. The color of the light is consumed is usually the contrasting one being transferred. As seen in a color wheel where, blue complement orange, red complement green, and yellow complement violet.
Thus, for a blue substance in solution, its complementary color is said to be orange, Given that the wavelength of orange color varies from 600 - 640 nm where it's maximum absorbance is approximately 633 nm. This wavelength is what is employed when analyzing the standard solutions and drink samples.
I need help with this, Please help.
Answer:
b
Explanation:
I know the answer is B hope this helps
Devonian Period: When was this? Why is this significant?
Answer:
I HOPE IT HELPED THANKS
Mass and energy are conserved:
Question 3 options:
A)
only in physical changes.
B)
in chemical changes and physical changes.
C)
always in physical changes and sometimes in chemical changes.
D)
only in chemical changes.
Why do elements form an ionic bond
Answer:
none of the above
Explanation:
What does the weight of an object depend on?
Time taken for an event to occur
Temperature of the object
Force of gravity
Atmospheric pressure
Answer:
c .force and gravity hope this the right answer
Really need to get this test right so please help me answer this question.
Answer:
Mass
Explanation:
Answer:
strength
Explanation:
Is this Ionic, Covalent, or Metallic? *
Answer:
Ionic
General Formulas and Concepts:
Chemistry - Compounds
Ionic Bonds - Forming between a metal and nonmetalCovalent Bonds - Forming between 2 nonmetalsMetallic Bonds - Forming between 2 metalsExplanation:
Step 1: Define
MgI₂ - Magnesium Iodide
Step 2: Identify
Mg is an Alkaline Earth Metal
I is a Halogen Gas
Step 3: Confirm
Mg will transfer its 2 electrons to 2 separate I's and will form an Ionic bond.
Describe the freedom of movement of particles as a substance changes states of matter from solid to liquid to gas.
Answer:
in a sold the particles are in a fixed position and can only vibrate on the spot but when it changes into a liquid the energy is used to weaken the bonds so there are weak forces of attraction between the particles, all particles are still touching each other but are now free to move around. Ina gas all the bonds are broken, the gas particles are free to move around anywhere and the more collisions there are, the more the pressure increases
How many grams are in 44.8 liter of oxygen gas
at STP?
Answer:
Pressure= 2 atm
temperature= 273K
volume= 44.8cm
3
=44.* litre
so,By PV=nRT
n=
RT
PV
mole=
0.0821×273
2×44.8
so, no of moles= 3.998=4
hence, 4×6.023×10
23
=24.08×10
23
Explanation:
if this answer is correct make me as brainlelist
At STP, one mole of every elements or molecules contains a volume of 22.4 L. Hence, a volume of 44.8 L of oxygen gas is 2 moles thus weighs 64 g.
What is STP condition?STP is the condition of standard temperature and pressure. A temperature of 298 kelvin and 1 atm pressure is referred to as standard temperature and pressure or STP.
At standard temperature and pressure, one mole of every compound or molecule contains 22.4 liters of the substance. We know that one mole of O₂ gas is 32 g/mol. 32 g of oxygen gas contains 22.41 liters.
The number of moles of 44.8 liters of oxygen is = 44.8/22.4 = 2 moles.
One mole of oxygen gas is 32 g. Hence, 2 moles are 64 g. Hence, the mass in grams of 44.8 oxygen is 64 g.
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HElp AsAp ^^^^^^^^^z
Answer:
B & D
Explanation:
hey there,
< The answers you put are correct.
Products are the result. In this reaction, it would be PbCl2, Cl2, and H2O but H2O is not an answer choice so it would just be the other two. >
Hope this helped! Feel free to ask anything else.
I will give brainliest and 76 points
Answer:
number 5 is the answer
Explanation:
Please help ASAP
Calculate the acceleration of this object. Remember, acceleration = net force / mass
Question 4 options:
1.7 m/s2
17,000 m/s2
2.3 m/s2
2 m/s2
Answer:
Put the actual question in the comments and I’ll solve it.
Explanation:
Describe an atom formed by covalent bonding
Answer:
Water atoms
Explanation:
It's a mix of hydrogen and oxygen linked with covalent bonds.
What does chlorophyll absorb during photosynthesis?
O A light
O B. oxygen
O c. carbon dioxide
D. sugar molecules
can you help me plz will mark brainlyiest
Which statement correctly describes microscopes? Check all that apply.
Microscopes make small things appear larger.
Magnification makes something look smaller.
Hans and Zacharias Janssen created the first microscope.
A lens is a transparent material that helps show the details of things observed.
The first microscope was made of two tubes with lenses at the ends.
Answer:
A, C, and DExplanation:
Microscopes make small things appear larger.
Hans and Zacharias Janssen created the first microscope.
A lens is a transparent material that helps show the details of things observed.
Answer:
A C and D i got it right on edge
Explanation:
What is the meaning of insoluble carbonate?
A dachshund walked 20 meters in 30 minutes. Calculate the speed. Provide your
answer in meters per hour.
The fossil record of the ________________ is found on the most continents helping to give evidence to the super continent. Group of answer choices Glossopteris Mesosaurus Cynognathus Lystrosaurus
Answer:
Glossopteris, Mesosaurus, Cynognathus and Lystrosaurus
Explanation:
Alfred Wegener was a German researcher, meteorologist and geophysicist. He is well known for his continental drift theory that he put forward. He did immense research and study and found many evidences of fossils found in the continents that claimed that continents were joined together to form a giant continent or super continent.
These fossils includes the fossils of Glossopteris, Mesosaurus, Cynognathus and Lystrosaurus. The findings of these fossils in continents have shown that continents have to be once joined together to form a super continent as the extensive oceans which is between these huge land masses forms or acts as a barrier for the fossils to transfer.
guys if you help me and I got a right I will Mark you BRAINLIEST >:DDDDDDDD
Answer:
d..i think..he found plant cells
Explanation:
Answer:
Its D
Explanation:
Which of the following is an example of a heterogenous mixture? O soy souce O lemonade O honey O trail mix
Answer:
soysauce bro
Explanation:
Answer:
trail mix
Explanation:
a heterogeneous mixture is a mixture with non-uniform composition. two or more of the mixture's components must be separate for the mixture to be heterogeneous.
When people run long distances, their muscles require increased amounts of oxygen. Which system is responsible for carrying this oxygen to the muscles?
What makes atoms electrically neutral?
Discuss the difference between renewable and non renewable resource and give and example of each
Will get brainliest for the best example!!!!!!!!!!!!!!!!!
Answer:
Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. ... Renewable resources are replenished naturally and over relatively short periods of time. The five major renewable energy resources are solar, wind, water (hydro), biomass, and geothermal.
Explanation:
Answer:
I am answering so the other guy can get brainliest: Renewable sources are sources that are *near-infinite (because the sun will eventually die one day) that are basically not depleted when used. Nonrenewable sources are sources that deplete when you use them, which are not easily replaceable. An example of a renewable resource is Solar Energy or Hydropower, a non-renewable source is fossil fuels or natural gas.
Explanation:
A baseball thrown into the air will continue on its path until which force acts upon it?
A. friction
B. gravity
C. inertia
D mass
Answer:
gravitational force exerted by the Earth, acts upon the baseball which is thrown into the air.
A baseball thrown into the air will continue on its path until a gravitational force acts upon it.
What is gravitational force?The force of attraction between all masses in the universe; especially the attraction of the earth's mass for bodies near its surface.
When a ball is thrown up the motion of the ball is away from the earth and the gravitational force of the ball is towards the earth. So, the gravitational force of the ball is opposite to the direction of motion.
Hence, a baseball thrown into the air will continue on its path until a gravitational force acts upon it.
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What is a neutrons and a proton?
Answer:
Protons are a type of subatomic particle with a positive charge
Neutrons are a type of subatomic particle with no charge (they're neutral).
When would a theory be modified?
A
when new observations are made with updated tools
B
when a celebrity says a theory is wrong
C
when scientists don’t like the existing theoretical model
D
when the existing theory is considered too negative or grim
what does the word Antibiotics mean?
Answer:
Antibiotics are medicines that help stop infections caused by bacteria. They do this by killing the bacteria or by keeping them from copying themselves or reproducing. The word antibiotic means “against life.” Any drug that kills germs in your body is technically an antibiotic. An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting bacterial infections, and antibiotic medications are widely used in the treatment and prevention of such infections. They may either kill or inhibit the growth of bacteria. One of the main medicines for relieving ear pain is acetaminophen — such as Children's TYLENOL® or Infants' TYLENOL® — not antibiotics. As with any medicine, ask your doctor which pain reliver is right for your child.Antibiotics are not available without a prescription in the United States. You will need to talk to a doctor or nurse practitioner to get a prescription. You can do this in person, over the phone, or over video. Amoxicillin is used to treat certain infections caused by bacteria, such as pneumonia; bronchitis (infection of the airway tubes leading to the lungs); and infections of the ears, nose, throat, urinary tract, and skin. It is also used in combination with other medications to eliminate H. The scientists have named the molecule “halicin”, in honour of HAL, the spooky AI system from 2001: A Space Odyssey. One of the researchers has described the “amazing” molecule as “arguably one of the more powerful antibiotics that has been discovered”.
Explanation: