Answer:
The term Big Bang defines that the Universe has expanded from the ancient hot and thick primary situation at some fixed time in the past.
Big Bang theory refers to the origin of the Universe. In the beginning, universe is very heavy and small hot ball of matter. It was a point no bigger than the head of a pin when all the things squished with each other and universe is expanded with huge explosion of energy. Due to expansion, it is cooled and results in the formation of Stars and galaxies. After sometime, atoms formed like helium and hydrogen.
Thus, statement (1), (3) and (4) is correct whereas statement (2) and (5) is incorrect. the right answer is - (It expanded slowly), (Stars and galaxies formed,) (Atoms such as hydrogen and helium formed.)
Explanation:
The statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.
What is the big bang theory?The big bang theory is a widely accepted theory in physics that intends to understand the origin of the universe.
According to this theory, the universe started with a hot and dense single point that progressively inflated and stretched.
The big bang theory has two major principles:
The universe is continuing to expand nowadays.An explosion caused matter and energy to expand in order to form all the universe.The big bang theory postulates that this phenomenon occurred approximately 13 billion years ago.
In conclusion, the statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.
Learn more about the big bang theory here:
https://brainly.com/question/10865002
In a lab investigation, one group of students (group A) measures the speed of a 0.1 kg toy car to be 2.5
m/s at the bottom of a ramp. Another group of students (group B) measures the speed of the car to be 3 m/s at the bottom of the ramp. The car's starting position at the top of the ramp is 1 m high. Calculate the kinetic energy of the car for group A
Answer:0.98 J
Explanation:
PE=mpg
PE=0.1x9.8x1
PE=0.98J
A scientist studying stars can estimate the temperatures of stars by their?
A molecule has two hydrogen atoms, one carbon atom and three oxygen atoms.
Answer:
actually its d
Explanation:
J
J h2co3
two hydrogen(H2)
1 carbon (C)
3 oxygen (o3)
The nuclear symbol for uranium-235 should be written as
O U-235.
225
92 U
233
143U
OU
Answer:
²³⁵₉₂U
Explanation:
²³⁵₉₂U
The nuclear symbol of U- 235 should be written as;
235 is the mass number of uranium. The mass number is written as the superscript before the symbol of the element.
92 is the atomic number of uranium. It is written as the subscript before the symbol of the element.
Can someone help me plz :/
I think its the
2nd one
Jorge's experiment involved which of the following?
Answer:
C. A physical change.
Explanation:
Given the image shown below.
It can be seen that the experiment is about phase changes of a substance. And phase changes of a substance is being done or carried out when the substance has passed through any of the processes such as melting, boiling, freezing, condensing, depositing, or sublimation.
And since these changes in the phase of a substance do not change the substance's chemical nature. It is called a physical change.
Therefore, in this case, Jorge's experiment involved "A physical change."
What happens if you try to move the atoms very close together?
Answer:
When you try to move the atoms two close, their positive nuclei repel each other. 2. A covalent bond is an electric force of attraction between two atoms that share outer electrons. ... The protons in each nucleus are repelling each other strongly, it takes more energy to move the atoms closer together at this point.
Explanation:
What are 4 signs that chemical reaction had occurred?
Answer:
Color Change.
Production of an odor.
Change of Temperature.
Evolution of a gas (bubbles)
Precipitate (formation of a solid)
There are 5 so you can choose 4.
The four signs that a chemical reaction has occurred are as follows:
Change in color.Alteration in temperature.Change in the state along with precipitation.The evolution of gas in form of bubbles. What is a Chemical reaction?A chemical reaction may be defined as a process that significantly involves the chemical transformation of one set of chemical substances to another. This process involves the utilization of substances known as reactants that are transformed into other substances known as products.
Every chemical reaction involves the four signs which are mentioned above. These signs are delivered by chemical reactions along with determined products. But the mass of the reactants and products always remains the same. Precipitation is only visualized in specific reactions with the possessions of certain characteristics.
Therefore, the four signs that a chemical reaction has occurred are well-mentioned above.
To learn more about Chemical reactions, refer to the link:
https://brainly.com/question/11231920
#SPJ2
How many bonds are there in the molecule Br2
Answer:
covalent bonds please mark me brainliest
Create a one-sentence summary that explains why hydrogen gas does react easily and spontaneously
due in 20 minutes help
Answer: Hydrogen belongs to group 1 metal elements in the periodic table.
Explanation:
The hydrogen is a highly active metal. It has a single electron in its valence shell and it can donate its electron to other metal atoms. Thus forming metal hydrides. The hydrogen when ignited it reacts with oxygen and burns explosively this is indicative of high reactivity and spontaneous reactivity of hydrogen atom.
is there sodium in C2H6
Answer:
No
Explanation:
C is carbon and H is hydrogen
Answer:
There is not sodium (Na) in C2H6.
Sodium on the periodic table is Na and if present in a molecule would be shown in the chemical formula i.e. NaOH or NaCl. C2H6 is an ethane with a two carbon chain.
What is the difference in the molecular formula of 2 successive members of the homologous series of a carbon additive?
I NEED HELP ASAP IM ON TIMER!!!!!!
Which of these refers to the strength of an acid?
a measure of the quantity of acid dissolved in water designated by molarity
an intrinsic characteristic of a particular acid, not related to concentration
the amount of hydrogen ions present in the acid
the amount of hydroxide ions present in a solution
Answer:
an intrinsic characteristic of a particular acid, not related to concentration
Explanation:
this is easy
An intrinsic characteristic of a particular acid is not related to concentration. Hence, option B is correct.
What is an acid?An acid is any substance that tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, and reacts with bases to form salts.
Whereas pH measures the concentration of solvated protons and does not tell us about the intrinsic acidity of chemical species present in solution, electrode potentials tell us about the intrinsic oxidizing power of the species present but provide no information on their concentration.
By the addition of a sufficient amount of redox indicator to a solution, its redox potential can be measured using redox electrodes.
Hence, an intrinsic characteristic of a particular acid is not related to concentration.
Learn more about acid here:
https://brainly.com/question/3700851
#SPJ5
how many moles are in 174g of NaCL?
FISH BOWL REAL IT IN ITZ ME AND MY FREIND GO BUDD WORK WORK. LOLLLLLL
Answer:
58.44277 grams
Explanation:
Im in middle school and I know this! LOL
Based on the image below, what is the atmospheric pressure?
1) 0.5 atm
2) 1 atm
3) 1.5 atm
4) 2 atm
5) it is impossible to tell
Answer:
1 atm
Explanation:
Given:
Atmospheric pressure = 760 torr
Find:
Atmospheric pressure in atm
Computation:
We know that ;
1 torr = 0.00131579atm
So,
760 torr = 760 x 0.00131579atm
760 torr = 1 atm (Approx)
Atmospheric pressure in atm = 1 atm
The diagram below has an atmospheric pressure of 760 torr. The
atmospheric pressure will be 1 atm.
This is calculated by converting Torr to atm which are both units of pressure.
The standard conversion formula is
1 torr = 0.00131579atm.
This means that
760 torr = 760 x 0.00131579atm
760 torr = 1 atm
Atmospheric pressure in atm is therefore 1 atm.
Read more on https://brainly.com/question/19587559
Electronegativity for boron is 2.0, and electronegativity for fluorine is 4.0. Which type of bond forms between boron (B) and fluorine (F) in BF ? ( the photo is how the BF is supposed to look like with the 3)
A) ionic
B) metallic
C) polar covalent
D) nonpolar covalent
Answer:
ionic.
Explanation:
the electronegativity difference is greater than 1.7.
The type of bond between boron and fluorine in BF₃ is non-polar covalent bond.
What is covalent bond?
Covalent bond is defined as a type of bond which is formed by the mutual sharing of electrons to form electron pairs between the two atoms.These electron pairs are called as bonding pairs or shared pair of electrons.
Due to the sharing of valence electrons , the atoms are able to achieve a stable electronic configuration . Covalent bonding involves many types of interactions like σ bonding,π bonding ,metal-to-metal bonding ,etc.
Sigma bonds are the strongest covalent bonds while the pi bonds are weaker covalent bonds .Covalent bonds are affected by electronegativities of the atoms present in the molecules.Compounds having covalent bonds have lower melting points as compared to those with ionic bonds.
Learn more about covalent bond,here:
https://brainly.com/question/19382448
#SPJ5
3 Reasons why animals migrate
Answer:to find a mate, because of a diminished food source, drought, flooding, volcanic activity, destruction of habitat, human presence in a habitat, an earthquake, seasonal changes, overpopulation of an area
Explanation:
The chemical you start with before the reaction are called reactants. What are the materials you end up with after the reaction called?
Answer:
Products
Explanation:
The materials you end up with in a reaction are called the products of the reaction.
For example;
A + B → C + D
A and B are the reactants
C and D are the products.
In a chemical equation, on the left hand side, A and B, we usually have the reactants. The right hand side C and D is the product of the reaction.4. The following element contains 12 protons and a mass number of 24. Which of the following statements is NOT correct about it? * O It contains 24 neutrons O It contains 12 electrons O Its atomic number is 12 O its contains 24 nucleons.
Answer:
It contains 24 neutrons.
Explanation:
Mass number = Protons + Neutrons
If you were to have 24 neutrons, the mass number would be 36, invalidating the known information. You have 12 protons and 12 neutrons to form a mass number of 24. Remember that your protons are the same thing as the atomic number, so you can make an equation using your known information to derive true statements.
10. A water molecule is made up of one oxygen atom and two hydrogen atoms. Why is water
considered a
pure
substance?
1 point
M
A. Water can be broken down by physical means.
B. Water can be combined with other substances by physical means.
C. Each water molecule is identical.
D. Water molecules are made up of different types of atoms
Please help me I will mark you as BRAINLIST
Heat passes from__________ to ________________
Answer:
How does heat move?
Heat moves in three ways: Radiation, conduction, and convection.
Radiation happens when heat moves as energy waves, called infrared waves, directly from its source to something else. This is how the heat from the Sun gets to Earth. In fact, all hot things radiate heat to cooler things. When the heat waves hits the cooler thing, they make the molecules of the cooler object speed up. When the molecules of that object speed up, the object becomes hotter.
Explanation:
Explain where you would find the three different types of muscles (cardiac, smooth and skeletal) and how these different types of muscles are used in the body.
Explanation: Skeletal muscle, attached to bones, is responsible for skeletal movements. The peripheral portion of the central nervous system (CNS) controls the skeletal muscles. Thus, these muscles are under conscious, or voluntary, control. The basic unit is the muscle fiber with many nuclei. These muscle fibers are striated (having transverse streaks) and each acts independently of neighboring muscle fibers.
What is the relationship between the electronic configuration, group and period numbers?
Can someone please answer this.
Answer: the number of circles in the electronic configuration of an element is represented in the periodic table as the period number that element is situated in. the number of electrons in the outermost shell of an element is represented in the periodic table as the group number that element is situated in.
Explanation: hope it helps :)
8. Well-aerated soils have the _______________ smell of good soil.
9. Loam soil contains 10 to 20 percent _______________ , 40 percent _______________ and 40 percent _______________ .
Answer:
9 is clay, silt, sand in that order
Explanation:
Loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand. Less than 50% of the soil is made up of minerals; the remainder is made up of organic matter and void space.
What is Loam soil?Clay, sand, plus silt are the three minerals that make up loam soil. Loam is the best soil for growing plants when mixed in the appropriate amounts. Less than 50% of the soil is made up of minerals; the remainder is made up of organic matter and void space.
In loam soil, little will grow without the latter two. The ideal combination of clay, sand, plus silt will provide the void where minerals, organic materials, water, and air may support life. Loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand. Basalt transforms into clay-like soil, whereas granite decomposes into silty sands.
Therefore, loam soil contains 10 to 20 percent clay, 40 percent silt and 40 percent sand.
To learn more about Loam soil, here:
https://brainly.com/question/12752720
#SPJ2
How many atoms of oxygen (O) are represented in the chemical formula shown below?
2 CO2
1 atom of oxygen
2 atoms of oxygen
6 atoms of oxygen
4 atoms of oxygen
Answer:
4 atoms of oxygen
Explanation:
2 atoms of oxygen gas O2
Answer:
4 atoms of oxygen
Explanation:
The given chemical formula is:
2CO₂
Unknown is the number of atoms;
There are :
C : 2 atoms of carbon
O: (2 x 2) atoms of oxygen in the given molecule
4 atoms of oxygen
If more solute can be dissolved in a solvent, the solution is
Answer:
A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved. At 20°C, the maximum amount of NaCl that will dissolve in 100. g of water is 36.0 g.
Answer: unsaturated solution.
Chemical reactions happen when
Answer:
Chemical reactions occur when chemical bonds between atoms are formed or broken. The substances that go into a chemical reaction are called the reactants, and the substances produced at the end of the reaction are known as the products
Explanation:
Complete the sentence. The lower the hydrogen ion concentration, the ______ the pH. higher lower closer to 7 closer to 0
Answer:
the higher the pH
Explanation:
Answer:
Hes right i took the quiz
Explanation:
Which two scientists’ theories supported the general consensus of the people and religious teachings of the time?
(One Answer)Thx !!!!
Aristarchus and Aristotle
Aristotle and Ptolemy
Ptolemy and Copernicus
Galileo and Aristarchus
Answer:
Your answer would be:
Aristotle and Ptolemy, so answer B).
(if you use edge, than this should be correct)
Sorry about this answer being late, I just discovered it
Answer:
b
Explanation:
