Answer:
Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .
Explanation:
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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 need help with this, Please help.
Answer:
b
Explanation:
I know the answer is B hope this helps
When people run long distances, their muscles require increased amounts of oxygen. Which system is responsible for carrying this oxygen to the muscles?
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.
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.
What does chlorophyll absorb during photosynthesis?
O A light
O B. oxygen
O c. carbon dioxide
D. sugar molecules
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:
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
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.
Which sample is a pure substance? zinc oxide sugar dissolved in water pond water soil
Answer:
Its (A) zinc oxide
Explanation:
just took the quiz
Among the given option, Zinc Oxide is a Pure substance.
What is Pure Substance ?A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.
A pure substance does not have to be of a single element or compound.
Hence, Among the given option, Zinc Oxide is a Pure substance.
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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).
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:
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:
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
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:
Devonian Period: When was this? Why is this significant?
Answer:
I HOPE IT HELPED THANKS
I will give brainliest and 76 points
Answer:
number 5 is the answer
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.
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Why do elements form an ionic bond
Answer:
none of the above
Explanation:
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.
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:
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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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which option is an element air, sodium chloride, oxygen,water
Answer:
oxygen
Explanation:
air is a way of saying oxygen but it isn't direct, sodium chloride is a combination of two different elements but isn't one element, and water is H2O but that isn't an element on the periodic table. The only real element that is on the periodic table is oxygen.
Answer:
oxygen
Explanation:
i took the test
Describe an atom formed by covalent bonding
Answer:
Water atoms
Explanation:
It's a mix of hydrogen and oxygen linked with covalent bonds.
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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Really need to get this test right so please help me answer this question.
Answer:
Mass
Explanation:
Answer:
strength
Explanation:
What number should be placed
in the blank in order for this
equation to follow the Law of
Conservation of Mass?
57g + ? ---→ 34g +10g 26g
Answer:
13g
Explanation:
34+10+26=70
70-57=13
13g would complete the equation
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
What is the meaning of insoluble carbonate?
What makes atoms electrically neutral?