Answer:
When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly
Explanation:
Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:
Since, all are metals so they need to be placed in the same group.The particular group is referred to (group one) is actually the most reactive metals on the periodic table. These are the elements that most easily loose their electron from their outer valence shell. Thus each element can easily give up their valence electron in a reaction to form a positive ion. These are the most easily reactive in this way.When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly.Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
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At 1 atmosphere and 20 degrees Celsius, all samples of H20(l) must have the same
A)volume B) mass C) density D) weight
(Explain)
Answer:
nice
Explanation:
one
At 1 atmosphere and 20 degrees Celsius, all samples of H₂0(l) must have the same density.
What is ideal gas equation?Ideal gas equation of gases gives idea about the behavior of gases at different conditions and it will be represented as:
PV = nRT, where
P = pressure
V = volume
n = moles
R = universal gas constant
T = temperature
After rearranging the equation, we get
P/RT = n/V
Quantities which are present on the left side all are constant and the value on the right side describes the density of the water.
Hence they must have same density.
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I need help ASAP PLZ!!!! I’m having trouble with a question, “How does the particle theory of matter help you explain why cold water is denser than hot water?” Help me please!!!!
solve this conversion of units
1. 42.89 L=_______ gal =
2. 32c=_______ K =
3. 75m=_______ in =
The outermost shell of an atom is called Valence shell.why?
Answer:
The number of electrons to be filled in each shell depends on Aufbau's principle and Hund's rule. Valency tells us only the total number of electrons present in the outermost shell of the atom and so it is different from the atomic number. Therefore, the outermost shell of an atom is known as valence shell.
physical properties of alkaline metals
Answer:
shiny.
silvery-white.
somewhat reactive metals at standard temperature and pressure.
readily lose their two outermost electrons to form cations with a 2+ charge.
low densities.
low melting points.
low boiling points.
Explanation:
Sulfur is right below oxygen in the periodic table, meaning it has similar bonding properties. Like oxygen, sulfur can form a compound with two hydrogen atoms, H2S. Draw a diagram of its structure and upload your file.
Standard temperature and pressure (STP) mean
Answer:
Standard Temperature and Pressure (STP) is the temperature of 0° C (273 K) and pressure of 1 atm (101.325 kilopascals). (Oxford Science Dictionary)
One mole of any gas has a volume of 22.4 dm³ at this temperature and pressure.
WILL MARK AS BRAINLIEST IF CORRECT
Answer:
B because if it's adding more atoms but becoming more compact then it is getting smaller.
Explanation:
Metals have special bonds, between atoms. The valence electrons are mobile and are shared by all metal atoms present.
Metals exhibit ______ due to the mobility of valence electrons.
a)brittleness
b)high conductivity
c)low melting point
d)high solubility in water
Answer:
High conductivity
Explanation:
Metals exhibit high conductivity due to the mobility of valence electrons.
SECTION B
What is the physical state of water at these temperatures?
125 °C =
-24 °C =
75 °C =
The physical state of water at the following temperatures are :
125° C = Gaseous state (Steam)-24° C = Solid state (Ice)75° C = Liquid stateAnswer:
The physical state of water at 125 °C will be gas.
The physical state of water at -24 °C will be ice.
The physical state of water at 75 °C will be liquid.
The the physical state of water before zero degree celsius is solid.
At 0 it is solid and liquid both.
From 0 to 100 degree Celsius it is liquid.
At hundred degree it is liquid and gas both.
At 100 and above 100 it is gas..
6. How many atoms are there in .250 moles of lead?
Answer:
1.505 × 10²³ atomsExplanation:
The number of atoms can be found by using the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.250 × 6.02 × 10²³
We have the final answer as
1.505 × 10²³ atomsHope this helps you
Which option explains how some parts of a plant can be white?
Some parts of a plant can be white because they do not contain chlorophyll.
Chlorophyll is a term to refer to a characteristic compound of most plants that has the function of:
Bring the green color to vegetablesTake charge of the photosynthesis process.Some plants do not have as much chlorophyll in their systems. However, this does not affect their reproduction and growth because they have developed other feeding methods through their roots.
These plants that contain low amounts of chlorophyll have pale and white colorations because chlorophyll is what gives the plants their intense green color.
Note: This question is incomplete because options are missing. Nevertheless, I can answer it based on my prior knowledge.
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In terms of their chemical properties (such as how they react with things), how do the elements in a group compare to the other elements in that group? For example, Sodium (Na) and Potassium (K) are both in the same group, what does this mean about their chemical properties?
Answer:
they're called families
Explanation:
the way they are grouped depends on how many valence electrons they have and similar chemical properties. for example: alkaline metals, alkaline earth metals, halogens, etc. :)
We know that organisms pass traits onto their offspring through reproduction. So how is it
possible that a new trait could ever appear in a population? Wouldn't a trait have to already
exist in the population?
Answer:
There are recessive traits and dominant traits
Explanation:
recessive traits are always hidden
dominant traits are the ones that are present in an organism
some recessive traits can be passed on to offsprings to become dominant
and some dominant traits can be passed on to become recessive traits
that's life
Answer:
because of genetic variation.
Explanation:
because of meiosis and a process called crossing over, there is genetic variation and diversity in the world, with humans and animals.
From a laboratory process designed to separate water into hydrogen and oxygen gas, a student
collected 10.0 g of hydrogen and 79.4 g of oxygen. How much water was originally involved in the
process?
Answer: 89.4
Explanation:
The amount of water which was originally involved in the process was 89.4 gram.It can be seperated in to Hydrogen and Oxygen through electrochemical process.
What is Electrochemistry ?Electrochemistry is the branch of physical chemistry concerned with the relationship between electrical potential difference, as a measurable and quantitative phenomenon, and identifiable chemical change, with the potential difference as an outcome of a particular chemical change, or vice versa.
Given,
Amount of Hydrogen : 10.0 g Amount of Oxygen : 79.4 gAmount of Water used : ?Therefore,
Mass of Reactant = Mass of product
= Mass of Hydrogen + Mass of Oxygen
= 79.4 gram + 10 gram
Mass of Reactant (Water) = 89.4 gram
Therefore, The amount of water which was originally involved in the process was 89.4 gram.It can be seperated in to Hydrogen and Oxygen through electrochemical process.
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Describe a simple experiment that can be perfomed in tha laboratory to demonstrate the formation of iron3chloride from iron fillings
Answer:
laboratory use the organic substances dissolve in water methanol or ethanol then Sinha to rise iron chloride solution is added a transient permanent coloration usually purple green or blue indicate the presence of a funnel or an hall
Explanation:
Name the producer in the food chain?
Answer:
Producers are autotrophs, or organisms that produce their own food. ... They are at the bottom of the food chain because they are eaten by other organisms, and they don't need to eat for energy. Producers make their own food through the process of photosynthesis instead of eating organic matter.
plss help me the question is in the pic
A star is mainly made of hydrogen gas, but most classes of stars include other elements such as helium, calcium, and other heavier elements and molecules.
Group of answer choices
True
False
if the electron affinity for an element is a negative number, does it mean that the anion of the element is more stable than the neutral atom?
Answer: No
Explanation: It means that an electron in an atom or ion is lower in energy than a free electron.
No, the anion of the element is more stable than the neutral atom but an electron in an atom or ion is lower in energy than a free electron.
What is kinetic energy?Kinetic energy is defined as the energy of the object that occurs due to the motion of the object. The total work needed by the body to starts accelerating it by the help of given mass which is supplied from the rest position and its mentioned velocity.
The energy body gets due to the process of acceleration by this the body will able to main the kinetic energy of the body without changing the speed of the body. The energy which has been stored in the body or any object by the help of the particular position or the proper arrangement of the parts is known as potential energy.
There will be no effect of the outside environment on the potential energy that present inside the body. The kinetic energy decrease or increase with change into the velocity.
Therefore, No, the anion of the element is more stable than the neutral atom but an electron in an atom or ion is lower in energy than a free electron.
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All living organisms do cellular respiration and give off carbon dioxide. TRUE OR FALSE
Answer:
false
Explanation:
All living things use cellular respiration to turn organic molecules into energy. Cellular respiration is the chemical process of breaking down food molecules in order to create energy in the form of adenosine triphosphate (ATP). ... This is called aerobic respiration.
Cellular respiration takes place in all living organism despite the level of organism and produces carbon dioxide and water.
What is cellular respiration?Cellular respiration is the process of breaking food or glucose by the action of biological catalysts to form carbon dioxide and water. This process goes through several stages including some electron transport chains
There are both aerobic and anaerobic respiration. Aerobic respiration takes place in the presence of oxygen whereas anaerobic respiration needs no oxygen.
Every living organism consume food and digest and from the food the cell makes energy by cellular respiration. Hence, the fact that all living organism do cellular respiration is true.
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Help me please!!!!!!!
Answer:
1. 264.369
2. 1772.65
3. 3.25
4.488
5. 0.164525
Explanation: I just added 0's to the ones that didnt have as many decimals which made it easy.
An atom contains 5 protons, 6 neutrons, and 6 electrons. What is the mass
number of this atom? *
Answer:
here you go
Explanation:
Atomic Number (Z) = Mass Number (A) - Number of Neutrons An atom has 5 protons, 5 electrons and 6 neutrons The atomic number = number of protons = number of electrons = 5 The mass number = 5 protons + 6 neutrons = 11
PLEASE HELP ME I REALLY NEED IT
Ocean: the large body of water on the Earth. 70% of the Earth's surface
the Water Cycle: the process by which water travels through the atmosphere and land
The Suns rays heats the water.
Water evaporates to hot water vapor.
Water vapor cools down from the wind, and condenses to a cloud.
It becomes bigger and bigger and percipitates to the group in the form of rain, snow, hail, or sleet.
Surface runoff takes the water back to the ocean.
Transpiration is when water gets in the roots and stem of trees/plants.
who discovered periodic changes in properties of elements
Answer:
The person is Dmitri Mendeleev
1. Why
was sulfanilamide mixed with DEG, raspberry flavoring, and saccharine?
Please give the answer
Answer:
A. The battery. D. The wind turbine. E. The solar panels
These give us electrical energy
There is a spelling error, I believe that is supposed to say stretched bow.
By stretching back a bow you are storing (Elastic) Potential Energy.
The transformation is (elastic) potential energy into kinetic energy (with some energy lost as sound and heat)
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Which of the compounds are used to reduce acidity of soil
Explanation:
Limestone acts as a soil acid neutralizer and consists of eithercalcium and magnesium carbonate orcalcium carbonate. These are called dolomitic limestone and calciticlimestone respectively
Which of the following describes kinetic energy?
Answer:
An object in motion.
Explanation:
"In physics, the kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. "
Someone pls help me With this I will make you as brain
Answer:
g(x) has the greater slope