Answer:
The core of the sun
Explanation:
The core of the sun acts like a furnace. The sun's energy comes from nuclear fusion
What do these two changes have in common?
water evaporating from a lake
sediment settling to the bottom of a muddy puddle
Select all that apply.
Both are only physical changes.
Both are chemical changes.
Both are caused by heating.
Both are caused by cooling.
Answer:
Both are caused by heating. Both are Chemical changes.
Explanation:
Water evaporates from the Sun's heat and is transformed into a gas.
Sediment is the particles of an object. When heat hits it, it starts breaking up, or in dry cases, heating and cracking.
The study of chemicals is called chemistry.
The correct answer is B.
There are two types of changes in the chemical reaction. These changes are as follows:-
Physical changeChemical change.The change which is reversible is called a physical change. For example - evaporating of water.
The change which is irreversible and can not get back to is original form is called chemical change. For example - the digestion process in a human.
According to the change, the correct answer is A that is a physical change because both can change back to their original form.
Hence, the correct answer is A.
For more information, refer to the link:-
https://brainly.com/question/25305623
which of these are broken down during chemical,but not physical,changes
Which of these what?
This isn't clear, can you put the answer choice or something?
7. What is the wavelength of a 4.34 x 10^15 /s wave?
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The wavelength of wave is 6.9x 10⁻⁸m.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.
There is a relation between frequency of wave, and wavelength of wave
Mathematically,
ν=c÷λ
where,
ν=frequency of light=4.34 x 10¹⁵s⁻¹
c is speed of light that is 3×10⁸m/s
λ is the wavelength of light=?
Substituting all the values
4.34 x 10¹⁵=3×10⁸m/s÷λ
λ= 3×10⁸÷4.34 x 10¹⁵
λ=6.9x 10⁻⁸m
Therefore, the wavelength of wave is 6.9x 10⁻⁸m.
To know more about electromagnetic wave, here:
https://brainly.com/question/12289372
#SPJ2
What do March 21st and September 21st have in common?
Answer:
The equinoxes are the only time when both the Northern and Southern Hemispheres experience roughly equal amounts of daytime and nighttime. On Earth, there are two equinoxes every year: one around March 21 and another around September 22.
Explanation:
1. What was the name of battle where the "shot heard around the world" happened?
chlorine is an active non metal
Chlorine in group 17 in the periodic table and includes halogens (also fluorine, bromine, and iodine)
Electron configuration of Cl : [Ne] 3s² 3p⁵
From this configuration, it can be seen that to obtain stability like the noble gas Ar - [Ne] 3s² 3p⁶, Chlorine will need one more electron so that its configuration is the same as Ar( become anion-Cl⁻)
Then it is said that Cl is reactive
And the Cl element is included in the non-metal group because it attracts electrons (electronegative)
The elements that include non-metals are halogens, noble gases, and 7 elements H, C, N, O, P, S, Se.
how many strands of nucleotides make up a DNA double helix
Answer:
two
Explanation:
Each molecule of DNA is a double helix formed from two complementary strands of nucleotides held together by hydrogen bonds between G-C and A-T base pairs.
Which of the following is a heterogeneous mixture
Answer:
a heterogeneous mixture is a mixture of two or more liquid substances that are immiscible that is they cannot mix
Answer:
dude I'm telling you now just think A. a fruit salad
Explanation:
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
An atom has 17 protons and 18 neutrons.
Which symbol represents that atom, including its mass number?
35S
33Ar
35Cl
34Si
in which of the following are photosynthesis and resperation alike
Answer:
i need a picture or more info to understand
Answer: photosynthesis puts together a glucose molecule, but cellular respiration takes it apart and uses its energy.
what is the role identification of work performance
Explanation:
It is one of the most important factors that encourage workers to put forth great efforts and work more efficiently.
Not sure how to do these, one example would prolly help me do the rest
Answer:
3. a. I⁻
Explanation:
The charge of the ion is determined by which group (vertical on the periodic table) the element is in. Iodine is in the halogens and therefore is most likely to have a 1- charge.
45.0 g of CaCl, are dissolved in enough water so that the molarity of the solution is 1.15 M. What is the volume in mL of the solution?
Why is the force of gravity greater for an object orbiting Earth than for the
same object orbiting Pluto?
A. Earth has only one moon, while Pluto has three.
B. Earth is closer to the sun than Pluto.
C. Earth has a heavy atmosphere and Pluto does not.
D. Earth is more massive than Pluto.
Answer:
d) Earth is more massive than Pluto.
Explanation:
The force of gravity is greater for an object orbiting the Earth than for the same object orbiting Pluto, because Earth is more massive than Pluto.
The common factor is that the greater the planet's mass, the greater its gravitational force acting on an object. Hence, the option (d) is the correct answer.
Which is an example of making a quantitative observation?
a. measuring the mass of metal used in a reaction
b. recording the color of a solid formed in a reaction
c. describing a liquid as having a slippery feel
d. rating an odor on how nice it smells
Answer:
A) measuring mass of metal used in a reaction
Explanation:
Quantitive observations is data involving statistics and numerical values.
what is chemistry ? Explain its types.
Answer:
Fundamentally, chemistry is the study of matter and change. The way that chemists study matter and change and the types of systems that are studied varies dramatically. Traditionally, chemistry has been broken into five main subdisciplines: Organic, Analytical, Physical, Inorganic and Biochemistry.
Explanation:
hope this helps
A molecular compound is?
Answer:
Molecular compounds are inorganic compounds that take the form of discrete molecules. Examples include such familiar substances as water (H2O) and carbon dioxide (CO2). Rather than forming ions, the atoms of a molecule share their electrons in such a way that a bond forms between pairs of atoms. ...
Explanation:
ym
Convert 1 meter into millimeters.
Group of answer choices
1,000 millimeters
10 millimeters
100 millimeters
1 millimeter
Answer:
1,000 millimeters
Explanation:
The half-life of tritium (H-3) is 12.3 years. If 48.0mg 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?
Answer:
The amount left after 49.2 years is 3mg.
Explanation:
Given data:
Half life of tritium = 12.3 years
Total mass pf tritium = 48.0 mg
Mass remain after 49.2 years = ?
Solution:
First of all we will calculate the number of half lives.
Number of half lives = T elapsed/ half life
Number of half lives = 49.2 years /12.3 years
Number of half lives = 4
Now we will calculate the amount left after 49.2 years.
At time zero 48.0 mg
At first half life = 48.0mg/2 = 24 mg
At second half life = 24mg/2 = 12 mg
At 3rd half life = 12 mg/2 = 6 mg
At 4th half life = 6mg/2 = 3mg
The amount left after 49.2 years is 3mg.
The energy involved when a neutral atom gains an electron is called ___.
Answer: The energy involved when a neutral atom gains an electron is called its electron affinity .
Explanation: Electron affinities are measured on atoms in the gaseous state and are very difficult to measure accurately.
compare catalytic and thermal cracking
Answer:
Catalytic cracking is an important process in the oil industry where petroleum vapor passes through a low-density bed of catalyst, which causes the heavier fractions to 'crack' producing lighter more valuable products
Thermal cracking is an extraction process in which hydrocarbons such as crude oil are heated to a high temperature to break the molecular bonds. Thermal cracking is a refining process in which heat and pressure are used to break down, rearrange, or combine hydrocarbon molecules.
Explanation:
As continents come together to form a supercontinent,
a. the ocean that jad separated them disappears
b. a giant ocean forms on the outside of the supercontinent
c. mountain ranges rise where continental plates converge
d. all of these
Separating a compound like H2O by electrolytes is that a chemical or physical change?
Answer:
pretty sure that would physical
which of the following is a compound?
How does a balanced equation satisfy the Law of Conservation of Mass
Answer: I think d
Explanation:
The density of nuclear matter:
a Increases with the increase in atomic number
b Decreases with the increase in atomic number
C
Does not change with the atomic numbers
d None of the above
Answer:
c, Does not change with the atomic numbers
Explanation:
What is the area called in which the electrons are found ?
Answer:
orbitals
Explanation:
1. Electrons close to the nucleus are in
energy levels; the farther an electron is from the
nucleus, the
Lits' energy level
O higher, lower
lower, lower
lower, higher
higher, higher
Answer:
Lower, Higher
Explanation:
What do you call this process that happened in crayons and candles where it’s liquid phase turned into solid?
Answer:
Freezing/Solidification
ASAP MULTIPLE CHOICE WILL MARK BRAINLIEST
An atom of gallium has 31 protons and a mass number of 70.
What is the atomic number for an atom of gallium?
31
35
39
70
Answer:
31
Explanation: