Answer:
the answer is (a)true.
Answer (s) true.
Explanation: Natural science can be divided into two main branches: life science and physical science. Life science is alternatively known as biology, and physical science is subdivided into branches: physics, chemistry, astronomy and Earth science.
what does "8 is great" mean as it pertains to valence electrons?
Answer:
stability and completely filled orbitals
Explanation:
As it pertains to valence electrons, "8 is great" means the valence electrons present in the orbital confers stability on the atom as the shell becomes completely filled.
For an atom to be stable, it must have completely filled outer orbitals. The number of electrons required is usually 8. This is the octet number which confers special stability on an atomic configuration. Elements having this number of electrons in their outer shell are unreactive.Tin-126 has a half life of 100,000 years. How many years does it take to
reduce 100 g of Tin-126 to 12.5 g?
100,000 years
200,000 years
50,000 years
300,000 years
Answer:
300,000 years
Explanation:
100g=0 years
50g=100,00 years
25g=200,00 years
12.5g=300,000 years
Explain why a lithium ion (Li+) is smaller than a lithium atom (Li).
Answer:
Lithium ions are smaller than lithium atoms. This is because the lithium atom has 2 shells, while the ion just has one shell. Bromide ions are larger than bromine atoms, due to increased inter-electronic respulsion.
Explanation:
hope this helps! maybe mark me brainliest?
Please help solve this question correctly, thanks :)
Answer: what question?
Explanation:
Answer:
theirs no question
Explanation:
no question or picture
Find the density of an object with the mass of 14 g and volume of 2cm^3. O 28 g/cm O 7 g/cm O 1/2 g/cm 0 / 56 g/cm
Answer:
7 g/cm^3
Explanation:
Please help me ASAP!!!!!!
How many moles are present in 5.24 x 1023 molecules of CH4?
I hope this helps. I am in a lower grade than you, I am assuming, but I wanted to help you
Answer:
40
Explanation:
a sample that has a half life of 45 years take ____ for the count rate to drop from 600 cpm to 150 cpm
Answer:
90yrs
Explanation:
Half life is the time taken for half of an original radioactive material to decay by half.
For the sample;
Half - life = 45yrs
Original amount = 600cpm
Start Number of atoms
0yrs 600cpm
First half life
45yrs 300cpm
Second half life
90yrs 150cpm
6th grade science i mark as brainliest
Answer:
It's the 4th one. The car is accelerating gradually.
describe the whole process of Aluminum extraction from bauxite.
Answer:
Extraction of aluminium
Aluminium ore is called bauxite . The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.
Answer:
The bauxite is purified to produce aluminium oxide, a white powder from which aluminium can be extracted. The extraction is done by electrolysis. The ions in the aluminium oxide must be free to move so that electricity can pass through it.
I know I am a little late answering this but I still wanted to answer the question for you . I am not good at explaining things so I copied and pasted but I hope this helps.
Which orbital can be modeled by a "peanut" shape?
Answer:
d - orbital
Explanation:
The d-orbital can modelled by a peanut shape.
A peanut shape closely resembles the shape of a double dumb-bell shape. The double dumb-bell shape is like that of a peanut.
The s-orbital has a spherical shape. p - orbital is dumb-bell shapedd - orbital is a double dumbellf - orbital has a complex shape.Therefore, since a peanut is like a double dumb-bell, it clearly models the d-orbital.
what does WHMIS mean?
Answer:
Workplace Hazardous Materials Information System
WHMIS is a short form for Workplace Hazardous Materials Information System. It is a comprehensive plan for providing information on the safe use of hazardous materials used in Canadian workplaces. Information is provided by means of product labels, material safety data sheets (MSDS) and worker education programs.
Answer:
Workplace Hazardous Materials Information System
Explanation:
How many molecules are present in 3.09 mol of silicon dioxide, SiO2
There are 1.86 x 10²⁴ molecules of Silicon dioxide, SiO₂
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
Moles can also be determined from the amount of substance mass and its molar mass
1 mol = 6.02.10²³ particles
Can be formulated
[tex]\tt \boxed{\bold{N=n\times No}}[/tex]
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Given3.09 mol of Silicon dioxide, SiO₂
n=mol=3.09
Number of molecules :[tex]\tt N=n\times No\\\\N=3.09\times 6.02\times 10^{23}\\\\N=\boxed{\bold{1.86\times 10^{24}~molecules}}}[/tex]
14)
Air can be considered a mixture. Which statement helps describe air?
A) Air contains a fixed ratio of atoms.
B) The components of air separate into visible layers.
C) The components of air can be separated by chemical means.
D) The exact mixture of components varies from point to point.
Answer:
the components of air can be separated by chemical means
Answer:
D) The exact mixture of components varies from point to point.
Explanation:
Here's why: Air can be considered a homogeneous mixture.The exact mixture of components varies from point to point. Air is made up of individual elements and compounds. When near a cow pasture, you can smell the compounds associated with cow patties but you can not see these as separate from the rest of the air
Boiling point and density are examples of
a) intensive properties
b) respective properties
c) reflective properties
d) extensive properties
Answer:
the answer is A
Explanation:
=
1.10
Which procedure involves a physical change in one of the substances?
O creating salt by reacting sodium metal and chlorine gas
O grinding chalk into a fine powder
o building a model rocket propelled by mixing baking soda and vinegar
O allowing a nail to rust
Answer:
Grinidng chalk into a fine powder
Explanation:
plzzzz help me I will mark u brainist
Answer:
B. Aluminum has layers of electrons that can slide over one another.
An unknown substance kept in a sealed container at room temperature has a pressure of 2 atm. When the container was opened, the substance was exposed to normal atmospheric pressure, 1 atm. Which change did the substance most likely undergo?
Neither the temperature nor the volume will change.
The volume will decrease.
The volume will increase.
The temperature will increase.
Answer:
I took the test it's C.The volume will increase.
Explanation:
Since the pressure went down from 2 atm to 1 atm, the volume will go up! They are inversely related.
The change that the substance most likely underwent is that the volume will increase.
BOYLE'S LAW:
The relationship between the volume of a gas and its pressure is explained by Boyle's law. Boyle's law states that the volume is inversely proportional to the pressure of a given gas. This means that as the pressure of a gas increases, its volume also increases and vice versa. According to this question, an unknown substance kept in a sealed container at room temperature and a pressure of 2 atm changed to normal atmospheric pressure (1 atm). This depicts that the volume of the gas increased since the atmospheric pressure decreased.Learn more at: https://brainly.com/question/1437490?referrer=searchResults
can someone help me with science plz. Make a prediction: What do you think the petri dish will look like on Day 5?
Answer:
it would have some bacteria considering it would probs take up to 4-6 days for it to grow
Explanation:
Which salt would HI and NH4OH produce?
Increasing the temperature of a gas mixture will decrease the kinetic energy of the gas particles.
Answer:
False
Explanation:
From what I know about water and gas, this is false
The mass of a bowling ball is 5 kilograms what is the mass of a bowling ball in grams?
The mass of the bowling ball in grams is 5000g
What is the mass of a bowling ball in grams?To convert the mass of a bowling ball from kilograms to grams, you can multiply the mass in kilograms by 1000, as there are 1000 grams in one kilogram.
Using metric system;
So, the mass of a 5-kilogram bowling ball in grams would be:
5 kilograms * 1000 grams/kilogram = 5000 grams
Therefore, the mass of a 5-kilogram bowling ball is 5000 grams.
Learn more on metric system here;
https://brainly.com/question/1837503
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The burning gases of the sun are matter in the gaseous state, whereas the ground you walk on is matter in the ___________state.
Answer:plasma
Explanation:
Which characteristic applies to all mixtures, including solutions?
a) Mixtures must be composed of compounds.
b)Mixtures are composed of a single element.
c)Mixtures are composed of two or more substances.
d)Mixtures have uniform structures throughout entire samples.
Answer:
c)Mixtures are composed of two or more substances.
Explanation:
From the given choices, it is true that mixtures are composed of two or more substances.
Mixtures have indefinite composition i.e. they consist of two or more compounds in any proportion by mass.Constituents retain their identity. The constituents reacts differently to changed conditions. They can easily be separated into constituents.Explain why halogens have a higher first ionization energy than group 16 elements?
Explanation:
Halogens are elements found in the 7-th group on the periodic table. They are predominantly know for their electronegativity values and they have a high ionization energy.
Ionization energy is the energy required to remove the most loosely held electrons in an atom. Across a period, ionization energy is known to increase progressively from left to right. This due to the decreasing atomic radii caused by the increasing nuclear charge which is not compensated for by successive electronic shells.Finding the mass of a bar of aluminum is 25 grams is it hypothesis observation inference or guess
Answer:
It is a observation
Explanation:
Which elements have similar behavior? barium silicon aluminum strontium osmium beryllium
Answer:
Barium, beryllium, and Strontium
Explanation:
These 3 elements are located in the same group, which determines the number of valence electrons.
The valence electrons determine how reactive an element will be.
A. →barium
B. silicon
C. aluminum
D. →strontium
E.osmium
F. →beryllium
Hope that this helps! :) :) :) :) :)
Which of the following describes an ionic bond?
A.electrons are shared between non-metals.
B.electrons are gained by metals to become anions.
C.a cation attracts an anion.
D.a "sea of electrons" causes a lattice structure to form.
How do scientists determine whether a chemical reaction releases or stores energy
Help quickly please, actual answer
Answer:
the answer is d i think probably of the format of that place of the only on to 9 so its d
Atoms of Oxygen-16, Oxygen-17 and Oxygen-18 have the same number of _________________?
Answer:
Atomic number or number of protons
Explanation:
The given species are all isotopes of oxygen. Isotopes have the same number of protons or atomic number. They only differ in the number of neutrons.
Isotopy is the existence of two or more atoms of the same elements having the same atomic number but different mass number. The different mass number is due to differences in their number of neutrons. Isotopes have the same electronic configuration and hence, they have the same chemical properties. Isotopes only differ in their masses.