Answer:
white
Explanation:
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
what dose pH mean on the periodic table
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
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:
What element has the noble gas configuration [Ar]4s23d8
Answer:
argon
Explanation:
Answer:
Argon
Explanation:
How many elements are present in the compound?
Mg2As3COHNi2
Answer: 6
Explanation: none needed lol
Which of the following forces weathers objects by expanding and changing shape?
Moving water
Wind
Plants
Ice
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:
Viruses and bacteria
Answer:
Whats the question lolzzzz
Explanation:
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.
What is a "control" in an experiment? *
Answer:
The factor that the person experimenting has control over
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.
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
Help please 2 mins til it submits
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!
which factor affects an objects weight but not its mass?
A. Volume
B.Magnetism
C. Gravity
D Conductivity
Answer:
Gravity
Explanation:
Gravity is the pull of an object to another object like a human to the Earth. This is weight.
Answer:
C. Gravity
Explanation:
Just Took The Test And Got A Perfect Score. ;)
what determines the atomic number of the atom
Answer:
the number of protons
Explanation:
that's it
Elements in the same _____ on the periodic table have the same number of valence electrons.
Metals typically lose electrons and become cations lose electrons and become cations lose electrons and become anions lose electrons and become anions gain electrons and become anions gain electrons and become anions gain electrons and become cations
Answer:
Metals typically loose electrons and become cations
Explanation:
Metals are typically found towards the left hand side of the periodic table. They typically possess fewer electrons in their outermost shell compared to nonmetals.
As a result of this, when metals form chemical bonds with other elements, it is energetically more favourable for metals to loose electrons and form cations.
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.
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
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 :(
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!
PLEASE HELP I NEED HELP ASAP I WILL GIVE BRAINLIEST AS SOON AS POSSIBLE
Answer:
1 . 2.393e+ 9
2. ???
3. 3.25e-6
Explanation:
2393 kg = 2.393e+9 mg
43.23 g = 4.323 dam
0.325 cm = 3.25e-6 km
(Note: I'm not 100% that these are correct, but I hope this helps you tho. ^^)
help please lol I’m stuggling
Answer:
balenced
Explanation:
1) Equal masses of different substances have the same volumes.
Answer:
True
Explanation:
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
The amount of matter in an object is its ____
weight
mass
volume
density
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
PLEASEEE HELPPP!!!! AND EXPLAIN PLS
Answer: True?
Explanation: THere is no question but I do know that is true because I answers that on a test and got it right. It was asking about:
how many Helium and oxygen molecules = H2O = + O2