What is the final temperature of the solution formed when 1.52 g of NaOH is added to 35.5 g of water at 20.1 °C in a calorimeter? NaOH (s) → Na+ (aq) + OH– (aq) ∆H = -44.5 kJ/mol
Answers
Answer : The final temperature of the solution in the calorimeter is,
Explanation :
First we have to calculate the heat produced.
where,
= enthalpy change = -44.5 kJ/mol
q = heat released = ?
m = mass of = 1.52 g
Molar mass of = 40 g/mol
Now put all the given values in the above formula, we get:
Now we have to calculate the final temperature of solution in the calorimeter.
where,
q = heat produced = 1.691 kJ = 1691 J
m = mass of solution = 1.52 + 35.5 = 37.02 g
c = specific heat capacity of water =
= initial temperature =
= final temperature = ?
Now put all the given values in the above formula, we get:
Thus, the final temperature of the solution in the calorimeter is,
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Using the balanced equation below, how many grams of cesium fluoride would be required to make 73.1 g of cesium xenon heptafluoride?CSF + XeF6 → CsXeF7
Answers
The correct answer is:
B; A new substance forms.
Explanation:
A physical change, such as a state change or dissolving, does not produce a new substance, but an abundant change does. In a chemical reaction, the atoms and molecules that connect with each other are described as reactants. Chemical reactions happen when chemical bonds are broken and formed. If the molecules in a substance crash into each other with enough energy, some of the bonds in the molecules can break. The atoms can make new bonds with different atoms. A new substance forms.
Answers
Answer:
OBSERVING AND QUESTIONING
Explanation:
when you use the scienfic method the first thing you have to do is question you theory and coming up with a hypothesis which is what you expect to happen
Answer:
make an observation
Explanation:
Answers
The volume of the rock is 7mL. The correct option is c)7ml
From the question,
We are to determine the volume of the rock.
When an object is submerged in a container containing a liquid, the submerged object displaces a volume of liquid equal to the volume of the object.
That is,
Volume of object = Final volume - Initial volume
From the given information,
Initial volume = 40mL
Final volume = 47mL
∴ Volume of the rock = 47mL - 40mL
Volume of the rock = 7mL
Hence, the volume of the rock is 7mL. The correct option is c)7ml
Learn more here: brainly.com/question/10136572
So, its 47mL - 40mL, which equals 7, so choice c) 7mL, the answer you picked!
(B) proton
(C) electron
(D) atom
Answers
Answer:
atom
Explanation:
(A) molecule is the a group of atoms which are bonded together,
(B) proton it is a particle that comprise an atom
(C) electron it is a particle that comprise an atom
(D) atom is the smallest part of an element that can still be identified
Hence the correct answer is D. The smallest part of an element that can still be identified as that element is an atom.
Answer:
(D) atom
Explanation:
The atom is the smallest unit of matter that has the properties of a chemical element.
The atom is composed of protons, electrons, and neutrons, they are subatomic particles.
Each chemical element has an atom that identifies it, but all atoms are composed of subatomic particles, this means that all atoms have electrons, neutrons, and protons.
Depending on the number of subatomic particles that we have is what gives the properties to each atom.
A set of two or more atoms, of one or more elements, form a molecule
c. Silverpoint
b. Ink painting
d. Liquid media
Answers
Answer : Option A) Dry media
Explanation : i) Dry media is a media that deposits graphite, charcoal, pastels, ordinary pencils, then moistened with a wet brush to get various painterly effects on the paper fibers.
ii) Silverpoint - Silverpoint media uses red chalk or traces of black pencil on white-coated paper usually the manuscripts,
iii) Ink Painting - Uses various inks on the paper.
iv) Liquid media - uses liquid pigments suspended in some base which in liquid state that soaks the paper.
Position 2
position1
position4
position3
Answers
Answer: Position 1
Explanation:
Seasons on Earth occur due to tilt of of its axis. Earth's axis is tilted 23.5° from horizontal. Thus, when Earth moves in the orbit around sun, sometimes the northern hemisphere points towards the Sun and sometimes away. When it points towards the Sun, it experiences Summer season and while it points away, winter occurs. In between, spring and autumn occur.
Thus, from the given diagram, norther hemisphere would have summer time at position 1 when the northern hemisphere is facing the Sun.
Answer:
The correct answer is Position 1.
Explanation:
The rotational motion of the Earth causes some parts to receive more heat from the sun, while others receive less. Its axis of rotation runs vertically from the North Pole to the South Pole. Since this axis is not completely vertical, the sun's rays are projected with different intensity during the translation movement. Since the Earth is tilted slightly to the left and the axis points to the side where the Sun is at position 1, the sun's rays reach the northern hemisphere with more intensity and the southern hemisphere with less intensity.
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