Select the correct answer from the drop-down menu.
Read the excerpt. Then complete the sentence about mood.
The mood of this excerpt can best be described as
.
Why’d you put chemistry as the subject for a question about mood? What’s the excerpt? What’s the choices in the drop down list?
Answer:
mysterious
Explanation:
took test
describe the role of a geographer
Answer:
Answer Below
Explanation:
Geographers use maps and global positioning systems in their work. Geographers study the Earth and the distribution of its land, features, and inhabitants. They also examine political or cultural structures and study the physical and human geographic characteristics of regions ranging in scale from local to global.
answer:
a geographer uses maps and global positioning systems in their work to study the earth and the distribution of its land & features & inhabitants and to examine political or cultural structures ranging in scale from local to global.
explanation:
that's the role of a geographer
i answered your question & hope you have a great day!
pls give me brainliest <3
Calculate the wavelength and energy of light that has a frequency of 1.5 x 10^15 Hz.
The study of chemicals is called chemistry.
The correct answer is [tex]2*10^{-7}[/tex]
All the data is given in the question, the data is as follows:-
Frequency is[tex]1.5*10^{15}[/tex]The formula that will be used in the question is as follows:-
[tex]Wavelength=\frac{c}{v},[/tex]
c=speed of lightv=frequency
After putting the value, the wavelength is as follows:-
W[tex]=\frac{3 * 10^8}{1.5 * 10^{15}}[/tex]
The W=[tex]2 * 10^{-7[/tex]
For more information, refer to the link:-
https://brainly.com/question/25305623
A gas is composed of individual particles which are in constant?
Answer:
Gases consist of particles (molecules or atoms) that are in constant random motion. Gas particles are constantly colliding with each other and the walls of their container. These collisions are elastic; that is, there is no net loss of energy from the collisions.
Explanation:
hope it helps
should i nut in this hore
Answer:
which? gotta gimme a picture so i can answer
Explanation:
Answer:
yes ;)
Explanation:
When water changes to water vapor it goes through ______. A) the chemical change evaporation B) the heat change evaporation C) the physical change evaporation D) the conduction change evaporation
Answer:
C) the physical change evaporation
Explanation:
Physical change: The term "physical change" is described as a change that occurs in the physical properties of a particular substance. The physical properties of a specific substance include shape, texture, mass, flexibility, color, and density, etc. Mostly, physical changes are considered as reversible.
In the question above, the water changes to water vapor. In this case, the evaporation process of water will be considered as a physical change. The water changes into the gas state from a liquid state while evaporation.
2. The most common type of solution is
solution
a
O liquid-solid
O liquid-gas
What structure in insects allows for oxygen to enter their body?
Answer:
Oxygen travels to insect tissues through tiny openings in the body walls called spiracles, and then through tiny blind-ended, air-filled tubes called tracheae.
The structure in insects that allows oxygen to diffuse into their body is the spiracle.
Insects are animals that belong to the class Insecta in the phylum Arthropoda. They have a segmented body that is divided into 3 majors parts:
The headThe thoraxThe abdomenIn addition, insects have jointed appendages and an exoskeleton made largely of chitinous proteins.
Gaseous exchange in insects is tracheal. The trachea is a network of tubes that lead to openings in the body of insects known as spiracles. In other words, air enters through the spiracle and connects to the trachea tubes where gaseous exchange occurs.
More on gaseous exchange in insects can be found here: https://brainly.com/question/21538375
The elements least likely to form bonds are found in which group?15
16
83
17
18
Answer:
its actually 18 so you dont have to feel lucky
Explanation:
ywy
What happens to the volume of a gas when the pressure increases and the temperature remains the same?
Answer:
This means that if a gas is heated up and the pressure does not change, the volume will. So for a fixed mass of gas at a constant pressure, volume ÷ temperature remains the same. The volume of a gas rises as its temperature is raised Balloons shrink when placed inside a beaker of cold liquid nitrogen
Explanation:
Answer: Amount, if the number of particles and the temperature are constant, is inversely proportional to strain. As the volume increases, there are two options for the strain to stay the same. ... In other words , the number of particles is equal to the volume if temperature and pressure are constant.
mark brainlest if right
Answer:
The answer is 1
Explanation:
I got this answer right.
Nickel is produced during stellar fusion.
O True
O False
What is being released into the
atmosphere that is causing
climate change?
Answer:
Greenhouse gases
Explanation:
They are what causes climate change and affects the ozone layer.
List the formal names and symbols for the four quantum numbers, their alternative names ( if applicable), and all possible values in the ground state of an atom
Answer:
See explanation
Explanation:
There are four sets of quantum numbers, they are;
1) Principal quantum number (n): The values of the principal quantum number ranges from 1 - ∞.
2) Subsidiary/azimuthal/orbital quantum number (l): The values of this set of quantum number ranges from 0-3 corresponding to s, p, d, f.
3) Magnetic quantum number (m): The values of the magnetic quantum number ranges from -l to +l.
4) Spin quantum number (ms): The values of spin quantum number are; -1/2 and +1/2
what type of bond is this combination most likely to form?
Sodium is a group 1 element with atomic number 1. It has 11 electrons. It is soft reactive metal. It has 1 valence electron.
Fluorine is a group 7 element, a hologen with 7 valence electron. It is a most reactive non metal.
When sodium react with fluorine, ionic bond is formed in the resulting compound sodium fluoride.
One sodium and fluorine each totaling 2 atoms are enough to make the bond.
As the bond is formed, both atoms have octet structure. That is they each have 8 electrons on their outermost shells.
The positive charge on sodium indicates that sodium had lost 1 electron to fluorine atom.
The negative charge on fluorine ion indicates that fluorine atom had gained 1 electron from sodium atom to form negative ion.
The name of the compound is sodium fluoride with formula NaF.
brainliest please <3
How do you know that K, an alkali metal is very reactive?
a. It conducts heat
b. It conducts electricity
C. It is a soft and shiny metal
d. It contains one valence electron
Answer:
it contains one valence electron
amino acids are the building blocks of which class of macromoleculces
Answer:
proteins
Explanation:
amino acids are the monomers that make up proteins. amino acids bond together to form dipeptides, polypeptide chains, and eventually proteins.
durring cellular resperation, chemical energy is converted to cellular energy true or false
a truck with a mad of 1500 kg has a negative acceleration of 5 m/s/s, how much forces did this require
Answer:
The answer is 7500 JExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question we have
force = 1500 × 5
We have the final answer as
7500 NHope this helps you
in what two ways can you increase the elastic potential energy of a bucket of water sitting on a bench brainly
I NEED THE ANSWER NOW PLEASEEEEE!
The largest element with electrons in two energy levels?
Answer:
alkaline earth metals
Explanation:
group 2A elements are the alkaline earth metals they have two electrons in the outermost energy level because their electron consideration ends in s2. you can add me and I'll help more please give me Brandy is I'm trying to move up I need two more to move up and I'll help you anytime I can
YOOOO HELP ME OUT
What do we call a solid liquid or gas that can't be broken into anything else?
Answer:
its called either a physical change or chemical change
Explanation:
List all possible values of the magnetic quantum number ml for a 4p election
Answer:
-1, 0 and 1
Explanation:
The magnetic quantum number gives the number of possible spatial orientations or degeneracy of the orbitals in the subshells.
The number of possible spatial orientation is limited by the azimuthal quantum number.
For each value of azimuthal quantum number, there is a set of magnetic quantum number.
In the quantum number 4p;
the azimuthal quantum number = 1
The degeneracy becomes; -1, 0, 1
Which substance has the highest density at room temperature?
a.
Hydrogen
c.
Water
b.
Oxygen
d.
They are all the same
The correct answer is Water
Water is the most dense compound of all the mentioned ones. Hydrogen and Oxygen are gasses.
William finds a piece of pure iron in his garden. After a few days, the iron begins to rust. What are the two types of substances involved in the rusting process of iron? Iron is with one kind of atom that combines with oxygen from the air to form rust (iron oxide). Rust contains two types of atoms, which means it is .
Answer:
IronOxygenExplanation:
Rusting of iron occurs during the reaction of iron and oxygen in the presence of moisture to form hydrous iron (III) oxide, which is a reddish brown substance.
By virtue of this, the atoms which are reactants in the redox reaction would e oxygen and iron.
I hope this was clear and easy to understand.
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an element
a compound
The half-life of tritium (31H) is 12.3 years. If 57.0 mg of tritium is released from a nuclear power plant during the course of a mishap, what mass of the nuclide will remain after 49.2 years? mg
Answer:
3.57 mg
Explanation:
The following data were obtained from the question:
Half life (t½) = 12.3 years
Original amount (N₀) = 57.0 mg
Time (t) = 49.2 years
Amount remaining (N) =?
Next, we shall determine the rate of disintegration. This can be obtained as follow:
Half life (t½) = 12.3 years
Decay constant (K) =.?
K = 0.693 / t½
K = 0.693 / 12.3
K = 0.0563 /year
Finally, we shall determine the amount remaining after 49.2 years as shown below:
Original amount (N₀) = 57.0 mg
Time (t) = 49.2 years
Decay constant (K) = 0.0563 /year
Amount remaining (N) =?
Log (N₀/N) = kt / 2.303
Log (57/N) = (0.0563 × 49.2) / 2.303
Log (57/N) = 2.76996 / 2.303
Log (57/N) = 1.2028
Take the anti log of 1.2028
(57/N) = anti log (1.2028)
57/N = 15.95
Cross multiply
57 = N × 15.95
Divide both side by 15.95
N = 57 / 15.95
N = 3.57 mg
Thus, 3.57 mg of the nuclide will be remaining after 49.2 years.
Which of these elements has stronger
metallic characteristics than aluminum?
1) He
2) Mg
3) Ga
4) Si
Answer:
Answer is 2) Mg
Explanation:
Mg has a some metallic characteristic that might be stronger than aluminum if you see it on the periodic table or on a computer
An __??___ a pure substance. Examples would include oxygen and fluorine.
A. Element
B. Compound
C. Homogeneous Mixture
D. Heterogeneous Mixture
A farmer dug a well but did not find any water.
Which most likely explains why the farmer did not find water?
Answer:
The bottom of the well is in an impermeable layer capping an aquifer. All layers underground are impermeable and there is no saturated zone.
Explanation:
;-)
Answer:
The answer is A
Explanation:
what information do we need to determine the molecular formula of a compound from the empirical formula?
