1. The term _________
refers to the chemical potential of hydrogen.
Answer:
PH
Explanation:
Answer:
Explanation:
pH but i'm really not sure
Why are models and a common set of units important for scientists?
Answer:
Explanation:
When researching a question in science, we collect data, interpret it, and share the results with other scientists. A common measurement system allows us to make direct comparisons instead of having to know things like how much a certain animal weighs.
11. Calculate the number of atoms of sodium in a 4.5-gram sample.
A 1.2 x 1023 atoms Na
B 2.5 x 1023 atoms Na
C 1.7 x 10-22 atoms Na
D 3.1 x 1024 atoms Na
Answer:
A
Explanation:
For the following situations, describe the contact and non contact forces that are involved.
A. A book sitting on a shelf
B. A soccer player kicking a ball; the ball soaring through the air and landing on the ground
C. A hiker in the woods reading her compass to determine which direction to go
D. A child on a sled; first, the child is sitting at the top of the hill, waiting his turn; then, the child pushes off and slides down the hill, eventually coming to a ston
Answer:
D
Explanation:
Bc I got it right
Answer:
For A: the contact I think would be the bookshelf holding it up the non-contact force would be gravity making it so the book would stay where it was put.
For B: the contact force would be the ball being kicked and the non-contact would be the gravity pulling it back to the ground.
For C: A hiker in the woods reading her compass to determine which direction to go The contact would be her holding the compass and moving around the non-contact would be the compass arrow turning every time she moves.
For D: The child on a sled for the contact force would be the person pushing the little kid down the hill the non-contact force would be the gravity that would be keeping the kid going down the hill and gravity stopping the kid at the bottom of the hill.
Explanation:
Have the same assignment and these are the answers I gave. Hope this helps someone!
Which of the following metals is most reactive?
a. Mg
b. Rb
c. Cs
d. Li
What increases acidity more, nitrile group or chloride group?
Answer:
The nitrile group
Explanation:
The nitrile group contains the C≡N bond. It should be recalled that triple bond is highly electronegative and withdraws electrons from the C-H bond more effectively than the halogen atom.
The higher effectiveness of the C≡N bond at electron withdrawal greatly reduces the electron density of the C-H bond thereby making the hydrogen atom of the bond highly labile
difference between halogens and group 0 elements
Answer:
Colourless. Although they have similar properties they are not identical. For example, as you descend Group 0 the density of the gas increases as does the mass of a single atom. ... All the halogens exist as molecules, bonding covalently to their own atoms - adding stability as they complete their full outer shells.The difference between halogens and group 0 elements is that in their electronic configurations the halogens have 1 electron less than the stable octet while the zero group elements have stable octet.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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If you were in Canada and purchased a 1 kg apple at the grocery,how many grams were in the apple?
Answer:
1000 gram
Explanation:
because mass is constant everywhere
How many significant figures are in 0.0810300600 kg
Answer: 2.
Explanation:
why can't a beaker be used to measuring the volume of a liquid
Answer:
It doesn't have measure marks on it.
The charge is affected by (more than 1 may be correct)
a. protons
b.mass
c.electrons
d.neutrons
Answer:
protons and electrons
Explanation:
protons give off a positive charge and electrons give off a negative charge
What is a property in Science
•how much space an object takes up
•something that changes all the time
•a characteristic or a quality of an object or substance
• a spoon
Answer:
dhsjsbdjdnxjdjdbrbdnñxndndndndjdndndndbf it's b
Which is one precaution to take when working with heat and fire?
O Do not use during experiments
O Keep flammables away.
O Avoid touching face and eyes.
O Do not mix chemicals unless told to do so.
Answer:
Keep flammables away
Explanation:
this would avoid anything catching on fire or burning down
ANSWER ASAPP
What is a compound?
Answer:
a compound is a substance that contains atoms of two or more chemical elements held together by chemical bonds. any combination of two or more parts, aspects, etc. a word formed from two existing words or combining forms.
Explanation:
a substance that contains atoms of two or more chemical elements held together by chemical bonds. any combination of two or more parts, aspects, etc. a word formed from two existing words or combining forms.
Answer:
a thing that is composed of two or more separate elements/mixture !
i hope this helps !
Matt's cube, after 5 trial, had an average destiny of 7.40. g/cm what is it made of ?
Explanation:
5 trial, had an average destiny of 7.40. g/cm
If I fill a tall glass with water and then transfer the water to a shorter glass, it appears there is more water. Is there more water?
Wood has a density of 0.531 g/cm3. What is the volume of 44 grams of wood?
Answer:
The answer is 82.86 cm³Explanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass of wood = 44 g
density = 0.531 g/cm³
It's volume is
[tex]volume = \frac{44}{0.531} \\ = 82.86252354...[/tex]
We have the final answer as
82.86 cm³Hope this helps you
describe how changing the particles changed the atom
Changing the particles changes the atoms by converting it to a new substance through bond change.
During a chemical reaction changes occurs in the atoms of an element due to the formation or breaking of bonds.
There is either loss or gain or sharing of atoms between two elements reacting together.
Bonds between atoms break and new ones form and energy is either given out or taken in.
This type of reaction leads to the formation of new substances made up of a new combination of atoms and a different configuration of electrons.
Therefore, because various changes occurs during a chemical reaction, changing the particles changes the atoms by converting it to a new substance through bond change.
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Which of the following is a reaction between an acid and a base?
HCI + NaOH + H2O + NaCl
CaCl2 + K25 + CaS + 2KCI
NaCl + AgNO3 →→ NaNO3 + AgCl
C3H8 + 502 + 3CO2 + 4H2O
The first one
HCl is a strong acid and NaOH is a strong base which will react and make H2O and NaCl
Why is chemistry known as the "central" science?
A. because chemistry involves the study of the central parts of matter
B. because chemistry is fundamental to understanding the other sciences
C. because chemistry is always studied after biology and before physics
D. because chemistry deals with processes that affect living and nonliving things
Answer:
D
Explanation:
Chemistry is often called the central science because of its role in connecting the physical sciences, which include chemistry, with the life sciences and applied sciences such as medicine and engineering. The nature of this relationship is one of the main topics in the philosophy of chemistry and in scientometrics.
How many sig figs are there?
4000.
The number of significant figures in 4000 is 1
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Answer:
the answer is A :)
Explanation:
Question 2 of 10
Which of these is not an example of how engineering has affected society?
O A. The seven-mile bridge that spans across the Gulf of Mexico to
connect two cities of the Florida Keys
O B. The Hoover Dam, which was built to prevent floods, provide
irrigation, and produce hydroelectric power
O c. The use of piers and beams used to build a strong foundation for
a house
D. Our understanding of how cancer cells grow and spread
Answer:
D. Our understanding of how cancer cells grow and spread
Pluto's average distance from the Sun is about 3,666,000,000 miles. What is this in inches?
Answer:
2.3227776e+14
Explanation:
Its a massive number
Pluto's average distance from the Sun is about 3,666,000,000 miles and in inches it is 2.3227776e+14.
What is lunar phase ?
Lunar phase is the phase of moon which is viewed from the earth, the lunar phase is also known as moon phase is a shape of moon's directly sunlit portion and it can be expressed quantitatively.The current moon phase for today is the new moon phase.The moon is known as earth's only natural satellite and combinedly with earth it forms the earth-moon satellite system.
The size of moon is one quarter of earth in diameter. It is fifth largest satellite in the solar system. The distance of moon from earth is 384,400 km. The radius of moon is 1,737,4 km. The gravity of moon is 1.62 m/sec^2.
The total surface area of moon is 3.793×10^7 km square and it's surface pressure is 10^-7 Pascal.There are total 8 phase of moon and these are new moon, first quarter, waxing gibbous, third quarter and waning crescent.
Therefore,Pluto's average distance from the Sun is about 3,666,000,000 miles and in inches it is 2.3227776e+14.
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A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. Given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh?
Answer:
Weight of 14.79 cm rod of iron = 640.51 gram (Approx)
Explanation:
Given:
Weight of 1 inch rod = 3.88 ounce
1 inch = 2.54 centimetre
1 gram = 0.035273 ounce
Find:
Weight of 14.79 cm rod of iron
Computation:
Weight of 14.79 cm rod of iron = 14.79[3.88/{(0.035273)(2.54)}]
Weight of 14.79 cm rod of iron = 57.3852 / 0.08959342
Weight of 14.79 cm rod of iron = 640.5068
Weight of 14.79 cm rod of iron = 640.51 gram (Approx)
Answer:
640.51 gram
Explanation:
on edg
If identical rocket ships were lifting off from Earth and Neptune, which
rocket would need more force for lift off and why.
Answer:It would be earth but not by much
Because Neptune has more surface mass but it’s a gas giant so it cancels itself out and would be pretty close Hope I helped
Answer:
it will need the same force. because the distance from Neptune to earth is the same.
Explanation:
What kind of questions CANNOT be answered by chemistry?
If someone could help me out I would really appreciate it! Thank you!
Answer:
d. why matter exists
Explanation:
The kind of questions that chemistry CANNOT answer is "why matter exists".
In Chemistry, question of how the properties, composition and structure of substances are is answered. Also, the transformations that these substances undergo, and the energy that they release or absorbe during the transformation processes are revealed in chemistry.
Chemistry can answer the question of what forms of matter exists but cannot answer why matter actually exists.
What is the volume of a 200 gram sample of gold if its density is known to be 20.5 g/mL?
Answer:
The answer is 9.76 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass of gold = 200 g
density = 20.5 g/mL
It's volume is
[tex]volume = \frac{200}{20.5} \\ = 9.7560975609...[/tex]
We have the final answer as
9.76 mLHope this helps you
given: f(x) 3x-1. g(x) 2x^2-3
=(3x-1) + (2x^2-3)
= 3x-1 + 2x^2-3
=5x^2-4
can someone tell me if its correct, im not sure if i am ;-;
f(x) = 3x - 1 = 0
f(x) = x = 1/3
By putting the value of x in g(x), we get
g(x) = 2(1/3)^2 - 3
g(x) = 2(1/9) - 3
g(x) = 2/9 - 3
g(x) = -25/9
Answer:g(x) = -25/9
Answer:
[tex]2x^{2} + 3x - 4[/tex]
Explanation:
(f + g)(x)=(3x-1)+(2x^2-3)
Simplify:
2x^2+3x−4
What is the mass of an atom with 7 protons, and 7 neutrons?
Answer:
Explanation:
Nitrogen has an atomic number of 7 (Z=7) because it has 7 protons in its nucleus. Some nitrogen atoms have an atomic mass number of 15 (A=15). A is the number of neutrons plus protons in the nucleus. However, we already know that there are 7 protons.
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