Answer:
The answer is A. Lithium and Sodium
A black hole is a
a. an object of zero volume and infinite density
b. an object from which nothing, not even light, can escape
c. an object that emits x rays as matter falls into it
d. an object that disappears from our universe
e. all of the above
Answer:
B. an object from which nothing, not even light, can escape
Explanation:
What do you think is the difference between an "open" system & a "closed" system?
Answer:
Hope it help you
Stayhomestaysafe
Plz mark my answer brainliest✍️✍️
Explanation:
There are three types of systems in thermodynamics: open, closed, and isolated. An open system can exchange both energy and matter with its surroundings. ... A closed system, on the other hand, can exchange only energy with its surroundings, not matter.
REAL NAME - SHRESTH DUBEY
The distance of the Kentucky Derby, a classic horse race, is 1.25 miles. How is this distance expressed in furlongs ?
HELP!!!! PLEASE, it would be much appreciated.
d it is made of cells
Explanation:
because it is the one that makes most sense
PLEASE HELP WILL GIVE BRAINLIEST
What is the importance of protons ?
Protons are important because they help keep the nucleus together, they also attract negatively charged electrons and keep them in orbit around the nucleus.
All 6 sides of a cube measure 65mm. Calculate the volume of the cube in cm32
What is the process called when the moon bagins to fade from full moon to new moon
During which process of the water cycle does water change from gas to liquid
All covalent compounds donot exist as giant aggregates. Why?
HELP ME PLEASE!!
HELP!!!
Opportunity cost refers to:
A. the price of a good set by supply and demand in a market.
B. the inability of an economy to address all people's needs.
C. the lost chance to make one choice when another is made.
D. the economic motivation for a business to produce a good or
service.
SUBMIT
Answer:
C
Explanation:
PLEASE HELP ME!!
Water (H2O) is composed of the same elements as hydrogen peroxide (H2O2).
Why do these substances have different properties?
The molecules are the same.
Water has more atoms than hydrogen peroxide.
The atoms are arranged differently in each molecule.
The atoms are the same.
Answer:
The molecules are the same.
Explanation:
If you put 8 protons and 8 neutrons, which element did you make?
oxygen
sulfur
berllium
gadolinium
Question 1
Why can't wee see atoms?
Answer:
They're too small
Explanation:
Atoms are smaller than the wavelength of visible light
Answer:
too small
Explanation:
This chart shows characteristics of three different types of atoms.
A 3-column table with one row titled valence electrons in three types of atoms. The first column labeled Atom X has entry 6 valence electrons. The second column labeled Atom Y has entry 2 valence electrons. The third column labeled Atom Z has entry 8 valence electrons.
Which statement is best supported by the information in the chart?
Atom X will donate electrons to Atom Y.
Atom X will accept electrons from Atom Y.
Atom Y will accept electrons from Atom Z.
Atom Z will donate electrons to Atom X.
Atom X will accept electrons from Atom Y.
Answer:
B) Atom X will accept electrons from Atom Y.
Explanation:
because X has 6 electrons and Y has 2 it would make sense for Y to give to X
Is sulfur dioxide a element?
yes it is a element.
Given the standard heats of reaction
Reaction ∆H 0
M(s) + 2 X2(g) → MX4(g) −98.7 kJ/mol
X2(g) → 2 X(g) +327.3 kJ/mol
M(g) → M(s) −20.1 kJ/mol
calculate the average bond energy for a single
M-X bond.
Answer in units of kJ/mol.
Answer:
Explanation:
M(s) → M (g ) + 20.1 kJ --- ( 1 )
X₂ ( g ) → 2X (g ) + 327.3 kJ ---- ( 2 )
M( s) + 2 X₂(g) → M X₄ (g ) - 98.7 kJ ----- ( 3 )
( 3 ) - 2 x ( 2 ) - ( 1 )
M( s) + 2 X₂(g) - 2 X₂ ( g ) - M(s) → M X₄ (g ) - 98.7 kJ - 2 [ 2X (g ) + 327.3 kJ ] - M (g ) - 20.1 kJ
0 = M X₄ (g ) - 4 X (g ) - M (g ) - 773.4 kJ
4 X (g ) + M (g ) = M X₄ (g ) - 773.4kJ
heat of formation of M X₄ (g ) is - 773.4 kJ
Bond energy of one M - X bond = 773.4 / 4 = 193.4 kJ / mole
What is a scale and why do you use it?
Answer:
Scale is defined as a system or series of marks used for measuring or registering. An example of scale is what someone would use to figure out the length of something. An example of scale is what someone would use to find out how much they weigh.
Explanation:
The equation, reactants
product + thermal energy, describes a(n)_____
reaction.
Answer: Here you go
Explanation:
The general equation for an exothermic reaction is: Reactants → Products + Energy.
calculate the oxidation number of s in S2O8^2-
Given problem:
S₂O₈²⁻
Find the oxidation number of S;
Oxidation number presents the extent of oxidation of each atom of elements a molecular formular or formula unit or an ionic radical.
For radicals:
"the algebraic sum of all the oxidation numbers of all atoms in an ion containing more than one kind of atom is equal to the charge on the ion "
S₂O₈²⁻; oxidation number of O is usually -2
2(S) + 8(-2) = -2
2S - 16 = -2
2S = -2 + 16
2S = 14
S = +7
The oxidation state of S in the radical is +7
in your own words describe the process of a physical change
Answer:
A physical change is when the form of an object changes, but the substance stays the same.
Example: Ice melting into water.
Which of the following neutral atom configurations satisfies the octet rule?
1s2 2s2 2p6 3s2 3p6
1s2 2s1
1s2 2s2 3s2 3p4
1s2 2s2 3s2 3p6 4s1
Answer:
2
Explanation:i did the test
What does the speed of the mixing colors tell you about the speed of the
molecules in hot and cold water?
How is iodine 131 similar to a normal atom of iodine?
Answer: Iodine 131 is a radioisotope with a very short half-life of 8.02 days, making it highly radioactive.
Explanation:
If a can of soup 150 g mass and 0.75g/ cm^3 density what’s the volume
Answer:
The answer is 200 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 = 150 g
density = 0.75 g/cm³
We have
[tex]volume = \frac{150}{0.75} \\ [/tex]
We have the final answer as
200 cm³Hope this helps you
A plant's growth response to water is called _____.
hydrotropism
geotropism
gravitropism
thigmotropism
Answer:
A or Hydrotropism
Explanation:
Answer:
hydrotropism Explanation:
because hydro= water and topism= the turning part of an organism hope this helps!! <3
which substance is a mixture? A. table salt B. gasoline C. aluminium D. carbon dioxide
The element found in Group 13, Period 2 is ______ a- Al b- Be c- B d- Mg
Convert the following to Celsius
16) 100°K
17) 200°K
18) 273°K
19) 350°K
Answer:
16) -173.15cel
17)-73.15cel
18)-0.15
19)76.85
Explanation:
I converted kelvins to cel
Brainly pls
What is the term used to describe a change in motion?
Answer:
it should be momentum if im not mistaken