Answer:
Reactivity! :)
Explanation:
I just took the test! "2.13 Physical and Chemical Changes"
Reactivity is the chemical property of the substance. Therefore, option (C) is correct.
What are the chemical properties?A chemical property can be described as the property that causes a change in the chemical structure of the substance. A chemical property of a substance can be seen in chemical change or reaction in the substance.
A chemical property represents the ability of a substance to combine with other substances or convert into a different product. The chemical composition is the identity of the substance and on changing it the substance turns into a different substance.
A chemical property gets determined when a change occurs in the chemical identity of the substance. The chemical properties such as toxicity, reactivity, enthalpy of formation, the heat of combustion, oxidation states, radioactivity, etc.
The color, melting point, and boiling point are the physical properties of a substance while reactivity is the chemical property.
Learn more about Chemical properties, here:
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what determines the atomic number of the atom
Answer:
the number of protons
Explanation:
that's it
What is a "control" in an experiment? *
Answer:
The factor that the person experimenting has control over
Explanation:
PLEZ HELP ANSWER. IM STUCK!
d. 3
Explanation:
because the valence electrons on O is 3
What amount of heat is required to raise the temperature of 250 grams of water by 20°C? The specific heat of water is 4180 J/Kg
Answer:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
Explanation:
The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. The direction of the force on the first object is opposite to the direction of the force on the second object. Forces always come in pairs - equal and opposite action-reaction force pairs.
1 pts
Define valence electrons.
o Valence electrons are the electrons on the outermost energy level of an
atom.
o Valence electrons are the electrons on the innermost energy level of an
atom.
Valence electrons are the electrons in the middle energy level of an
atom.
Valence electrons are the electrons on the inside of the nucleus of the
atom.
Answer:
Valence electrons are the electrons on the outermost energy level of an
atom.
The correct answer will be Valence electrons are the electrons on the outermost energy level of an atom.
In a water molecule, oxygen attracts electrons more strongly
than the hydrogens do because an oxygen atom contains
more
in its nucleus.
Enter the answer
Elements in the same _____ on the periodic table have the same number of valence electrons.
What element has the noble gas configuration [Ar]4s23d8
Answer:
argon
Explanation:
Answer:
Argon
Explanation:
One tank of gold fish is fed the normal amount of food once a day. A second tank is fed twice a day. A third tank is fed four times a day during a six week study. The fish's weight is recorded daily. All tanks were of the same size and shape. IV: DV: Control Group:
The question is incomplete, the complete question is;
One tank of goldfish is feed the normal amount which is once a day, a second tank is fed twice a day, and a third tank is fed four times a day during a 6 week study. The fishes' body fat is recorded daily.
Independent Variable-
Dependent Variable-
Constants
Control Group-
Answer:
A) The amount of food the gold fish receives
B) Body fat of the gold fish
C) -Type of fish used in the study (gold fish)
Time period within which the fishes were fed (Six week period)
Shape and size of tank
D) group of gold fish fed the normal amount
Explanation:
The purpose of the study is to determined the impact of amount of feed on the body fat of gold fish. Hence, the amount of feed is the independent variable while the body fat of the feed is the dependent variable.
The control group receives the normal amount of feed (once a day). The fishes are all gold fish, fed within a six week period. All the tanks were of the same shape and size. These are the constants in the study.
The amount of matter in an object is its ____
weight
mass
volume
density
what dose pH mean on the periodic table
Help me please !!!
Which of the following can be inferred from the diagram above that shows the dependence of potential Energy on the Internuclear distance between two atoms?
A)The atoms form a bond with a bond length of 25 pm
B)The atoms form a bond with a bond length of 75 pm
с)The net force between the atoms is attractive at 25 pm
D)The net force between the atoms is attractive at 75 pm
Answer:
B)The atoms form a bond with a bond length of 75 pm
A teacher puts two tablets in a glass of water. The teacher
stirs the water with a spoon until the tablets start to bubble.
Which of the following is LESS dense than water?
This question is incomplete because the options are missing; here are the options:
Which of the following is LESS dense than water?
The spoon
The glass
The tablets
The bubbles
The correct answer to this question is The bubbles
Explanation:
In general, the density of materials and substances affects their buoyancy. This implies in water less dense materials will float and those with higher density will sink. In the situation presented, the only element that is less dense than water are bubbles; this is shown by the movement of the bubbles as these originate in the bottom of the glass of water but they rise to the surface, which shows they are less dense than water.
Answer:
the bubbles
Explanation:
State the Periodic Law. Why is it so important in the study of chemistry?
Answer:
Summary. To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered.
which of the following pairs would have
a the
larger size
K or k+ ?
Explain your
ur answer.
Answer: Here u go!
Explanation:
In other words, "K"^(+) has bigger effective nuclear charge than "Cl"^(-), which translates to a bigger net positive charge felt by the outermost electrons. This will compress the energy levels a bit and make the ionic radius smaller for the potassium cation. Therefore, the chloride anion will have the larger atomic radius.
Hope this helps ma dude!
PLEASE HELP ASAP!!
If an element has the atomic number of 13 and a mass number of 27, what
is that element?
-cobalt
-aluminum
-silicon
How many elements are present in the compound?
Mg2As3COHNi2
Answer: 6
Explanation: none needed lol
At what time of day is sunlight strongest - in the early morning (when the Sun has just risen)
or at noon (when the Sun reaches its highest point)?
Answer:
noon is the answer. Hope it helps
Answer:
Noon
Explanation:
Hope this helps <3
Nitrogen (N) is element number 7 in the periodic table. It has a mass number of 14. Nitrogen
has gained 3 electrons. Nitrogen is a/an___.
a. Anion
bcation
c. Isotope
d. All of the above
1) Equal masses of different substances have the same volumes.
Answer:
True
Explanation:
HELP ASAP!! FILL IN THE BLANKS! will be brainliest!!!
Answer:
Don't mark me brainliest because of this but I'm pretty sure your supposed to give us the words because teachers don't give you things like that without the words you will the answer in with.
Answer:
Same as number of NUETRONS
POSITIVE charge
number of protons is the same as the atomic NUMBER
Located in the Nucleus
Larger mass than ELECTRONS
Explanation:
GOOD LUCK
To which family on the Periodic Table does this Bohr Model belong?
Answer:
As the valance shell have 7 valance electrons .
It belongs to halogen family (group 17).
PLEASE HELP ME FAST THANKYOU! :)
What is a substance said to be if it evaporates easily?
A.crystallized
B.condensing
C.changing pigmentation
D.volatile
Which element has the most metallic characteristics?
O Selenium (Se)
Arsenic (As)
O Germanium (Ge)
O Gallium (Ga)
Answer:
(Ge)
Explanation:
I'm just taking a wild guess really!
Viruses and bacteria
Answer:
Whats the question lolzzzz
Explanation:
The isotope Np-238 has a half life of 2.0 days if 96 grams of it were present on Monday how much will remain six days later
Answer:
12 grams
Explanation:
For any radioactive substance
the amount of substance left after n half life is given by = [tex]x/2^n[/tex]
where x the original amount of substance.
____________________________________________
Half life of isotope Np-238 = 2 days
total no of days = 6
no of half life =total no of days/Half life of isotope Np-238 = 6/2 = 3
thus,
for our problem n = 3
initial amount of Np-238 = 96 grams
thus,
the amount of substance left after 3 half life = 96/2^3 = 96/8 = 12 grams.
Thus, 12 grams will be left after six days.
How would you calculate the gravitational potential energy of a 2 kg bottle of soda falling off of a kitchen table that is 0.76 m tall ?
Answer:
14.9 Joules .
Explanation:
P. E. = m g h
= 2 * 9.8 * 0.76
= 14.9 Joules to the nearest tenth.
Answer:
2*0.76*97
Explanation:
C3H8 +5O2→ 3 CO2 + 4 H2O
In the reaction above, what is the total number of moles of reactants consumed when 1.00 mole of CO2 is produced?
a
0.33 mol
b
2.00 mol
c
1.33 mol
d
1.50 mol
Answer:
1.33
Explanation:
sorry if im wrong :(
How many molecules are in 2,10 mol CO2?
0 3.79 X 1024 molecules
O 2.53 x 1024 molecules
O 1.26 X 1024 molecules
O 3.49 * 10-24 molecules
Answer:
the answer is the 3rd option
Explanation:
which is 1.26 x 1024 calculating with avogardos law
Answer:
1.26 X 1024 molecules
Explanation:
Combustion of a hydrocarbon, X, is given by the equation: 2 X + 5 O2 (g) --> 4 CO2 (g) + 6 H2O (g) ∆H = -75.0 kJ Use this information and the standard enthalpies of formation listed in the text or elsewhere, to determine the standard enthalpy of formation of the hydrocarbon, X.
Answer:
Hof(X) = - 1474.9 KJ/mol
Explanation:
The reaction equation given to us is:
2 X + 5 O2 (g) --> 4 CO2 (g) + 6 H2O (g) ∆H = -75.0 kJ
Now, the equation for the standard enthalpy of formation of the reaction is written as follows:
ΔH = 4*Hof(CO2(g)) + 6*Hof(H2O(g)) - 2*Hof(X) - 5*Hof(O2(g))
where,
ΔH = - 75 KJ
Hof(CO2(g)) = Standard Heat of Formation of CO2(g) = -393.5 KJ/mol
Hof(H2O(g)) = Standard Heat of Formation of H2O(g) = -241.8 KJ/mol
Hof(X) = Standard Heat of Formation of X = ?
Hof(O2(g)) = Standard Heat of Formation of O2(g) = 0 KJ/mol
Therefore,
-75 KJ = (4)(-393.5 KJ/mol)+ (6)(-241.8 KJ/mol) - (2)(Hof (X)) - (5)(0 KJ/mol)
- 75 KJ + 3024.8 KJ = - (2)(Hof(X))
Hof(X) = -2949.8 KJ/2 mol
Hof(X) = - 1474.9 KJ/mol