Answer:
The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.
Explanation:
Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q=?c= 4.186 [tex]\frac{J}{g*C}[/tex]m= 12 gΔT=Tfinal - Tinitial= 21 °C - 16°C= 5 °CReplacing:
Q= 4.186 [tex]\frac{J}{g*C}[/tex] *12 g *5 °C
Solving:
Q=251.16 J
Since 1 J is equal to 0.2388 cal, then the following rule of three can be applied: if 1 J is equal to 0.2388 cal, then 251.16 J to how many cal are?
[tex]cal=\frac{251.16 J * 0.2388 cal}{1 J}[/tex]
cal= 59.98 ≅ 60
The heat required to raise the temperature of 12g of water from 16 C to 21 C is 60 cal.
The calorimeter measures the transferred heat of the system. 60 cal is heat is required to raise the temperature of water from 16 to 21 degrees celsius.
What is heat?Heat is the product of the mass, specific heat, and the change in the temperature of the system.
Heat exchanged by the system is calculated as:
[tex]\rm Q = \rm m c \Delta T[/tex]
Where,
Mass (m) = 12 g
Specific heat (c) = 4.186
Change in temperature = 5 degrees celsius
Substituting values in the equation:
[tex]\begin{aligned} \rm Q &= 12 \times 4.186 \times 5\\\\&= 251.16 \;\rm J\end{aligned}[/tex]
Converting joules into cal:
[tex]251.16 \times 0.2388 \;\rm cal = 60 \;\rm cal[/tex]
Therefore, the heat required is option b) 60 cal.
Learn more about the heat here:
https://brainly.com/question/13507243
Kayla’s teacher gave each lab group three liquids and asked them to test their pH. Kayla tested each one and recorded her results in the chart below.
She then combined the liquids and tested again. She combined liquid C and D and the resulting pH was 7.
Which statement BEST describes the process that took place when liquid C and D were combined?
F) D. The solution would be slightly acidic.
G) C. The acid and base would neutralize to form a salt.
H) A. The acid and base would neutralize to form an element.
I) B. The solution would be slightly basic.
Answer:
A. The acid and base would neutralize to form an element.
Answer:
egc jnpz rof join it on google meet
How would you obtain ethanol from rice starch?
Answer:
By putting the rice in water
Explanation:
what is the density of a material with a mass of 12 grams and a volume of 3 mL?
Answer:
The answer is 4 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
So we have
[tex]density = \frac{12}{3} \\ [/tex]
We have the final answer as
4 g/mLHope this helps you
Joe bought a roll of gray duct tape containing 5400 inches. If there are 5280 feet in a mile, how
many miles long is Joe's roll of duct tape?
Answer:
STANDARD: 0.085 mi, 450 ft, or 150 yds
METRIC: 0.137 km, 137.16 m, or 13716 cm
Explanation:
1. A teacher instructs her students to measure out 50.0 mL of hydrogen
peroxide for three trials of an experiment. A student measures out 37.2 mL,
38.7 mL, and 36.9 mL.
Use this information to answer the questions below (1a and 1b).
3 points
1a. Calculate the percent error for each measurement and include them
below. (For example: 1%, 2%, 3%) *
Answer:
by measuring the teacher gets to 1590
Explanation:
ndnmv drf
A lead fishing weight of 39.7g is submerged in a graduated cylinder of water containing 75.0mL of water. The water level will increase to what volume in the cylinder?
Answer:
78.5 mL
Explanation:
Step 1: Given data
Mass of the lead fishing weight: 39.7 g
Volume of water in the graduated cylinder: 75.0 mL
Step 2: Calculate the volume of the lead fishing weight
The density of lead is 11.34 g/mL.
39.7 g × (1 mL/11.34 g) = 3.50 mL
Step 3: Calculate to what volume will increase the water level
The final volume of water will be equal to its initial value plus the volume displaced by the lead fishing weight.
V = 75.0 mL + 3.50 mL = 78.5 mL
use the facts that water has a higher specific heat than rock (such as Granite) to explain the differences in the temperature curves for the two cities in the graph.
Since water has a high specific heat, that results in water being able to store/require more energy in order to change it’s temperature. Since San Francisco is so close to water, that would mean that it’s temperature should vary less since water would be able to keep the temperature around the same value even if there was an increase or decrease in thermal energy.
You just got a free ticket for a boat ride, and you can bring along
2 friends! Unfortunately, you have 5 friends who want to come along.
Answer:
10
Explanation:
Khan Academy
What is the role for dna in determining an organisms traits?
Answer:
DNA contains the genes or the genetic material of an organism. Its role is to store information that are essential in controlling the genetic makeup or producing a certain characteristic of an organism.
George has several plants in his garden. Once in a while, he adds fertilizer to the soil. The leaves absorb the nutrients in the fertilizer and look healthy. If a cell is compared to a plant, which organelle helps transport fertilizer from the soil to the leaf?
Answer:
A vesicle. Vesicles are involved in metabolism, transport, buoyancy control, and temporary storage of food and enzymes
Which choice is not an example of a molecule?
if a baseball player hits a baseball from 4 feet off the ground with an initial velocity of 64 feet per second, how long will it take the baseball to hit the ground? use the equation h= -16t^2+4t + 4 round your answer to the nearest tenth hundredth
Answer:
4.06
Explanation:
What advances in technology helped usher in the scientific revolution? Choose the best answer.
1.The landing on the Moon by Apollo brought about the scientific revolution.
2.Discoveries by scholars in the Catholic Church revolutionized scientific knowledge.
3.The discoveries by ancient Greek, Muslim and Chinese scientists.
4.The discovery of optics gave scientists instruments such as microscopes and telescopes.
Answer:
The discovery of optics gave scientists instruments such as microscopes and telescopes.
Explanation:
The period between the 16th-8th century was called the period of the scientific revolution. At this time, the foundations of our modern science was laid.
One of the characteristic of this period was the emphasis on the scientific method which upheld results from reproducible experiments.
Nicolaus Copernicus, Francis Bacon and Isaac Newton were leading names in this period.
It was within this period that the discovery of optics gave scientists instruments such as microscopes and telescopes and scientific examination of the celestial bodies was launched.
Earth Layers: describe each layer of makeup, location, and physical properties.be sure to include which layers are compositional and watch are mechanical
Answer:
Ok so the earth layers are
Crust, the surface of the earth
Mantle, where the lava usually comes from or how volcanos form due to the tectonic plates moving
outer core
inner core is the hottest
if you are asking for the compositional and mechanical layers that would be
Crust, mantle, core, Lithosphere, Asthenoshpere, Mesosphere, out core, and inner core
Mechanical: Lithosphere, Asthenosphere, mesosphere, outer and inner core
Compostional: Crust, Mantle, and core
What is a property of all bases
Answer:
The property of all bases are or might be conversation
Explanation:
On edg
Solid formation begins with the weathering of ____?
Subsoil
Humus
Rock
Litter
Im giving brainliest to the correct answer
Answer:
The weathering of Rocks
Explanation:
C
What are the two main reasons why most metals are more dense than most plastic and wood?
Answer:
Most common metals like aluminum, copper, and iron are denser than wood. The atoms that makeup metals are generally heavier than the atoms in plastic and wood and they are packed closer together.
what is ohm's law? in simple terms please. I dont know but This is what I said, formulas to determine the voltage, resistance or the current. Is this right?
Answer: Your answer was pretty close, but we could make it better! Simply put, ohm's law states that by doubling the voltage across a circuit, the current will also double. You could also say that it was a formula used to calculate the relationship between voltage, current and resistance in an electrical circuit, or (E = IR). Hope this helps!
Explanation:
The complex K4[Zn(CN)4(O2)2] is oxidised into Kz[Zn(CN)4(O2)2], then which of the following is correct ?
(A) Zn(II) is oxidised into Zn(IV)
(B) Paramagnetic moment decreases
(C) O-O bond length increases
(D) Paramagnetic moment increases
Answer:
D
Explanation:
THE ANSWER ID DEFINITLY D
The reaction in which methane is burned, CH4 +202 --> 2H20 + CO2, is an example of a
combustion reaction
O synthesis reaction
O decomposition reaction
O precipitate reaction
Answer: Combustion
Explanation:
Methane gas or natural gas is the hydrocarbon that reacts with oxygen as shown below: CH4 + 2O2 → CO2 + 2H2O There are two types of combustion reactions: complete and incomplete combustion. Therefore there are four products, carbon dioxide, water, carbon, and carbon monoxide.
Which statement is NOT true about energy?
A. Energy can be classified as Potential and Kinetic
B.Energy is the ability to do work
C. Ideas and thought are examples of energy
D.Energy can be stored
Answer:
a
Explanation:
Answer:
A
Explanation:
what does it mean if elements are in the same group on the periodic table?
Answer:
mostly metals
Explanation:
just learned
An acid-base reaction of (r)-sec-butylamine with a racemic mixture of 2-phenylpropanoic acid forms two products having different melting points and somewhat different solubilities. Draw the structure of these two products. How are the two products related? Be sure to answer all parts.
Answer:
See explanation
Explanation:
When an optically active compound reacts with a racemic mixture, two different products appear .
Hence, when (R)-sec-butylamine reacts with a racemic mixture of 2-phenylpropanoic acid as shown in the image attached.
Enantiomers are optical isomers which are mirror images of each other. The image attached was obtained from Bartleby.
what happens to the particles of a substance as it's temperature increases
A chemical formula is given.
CO+C+0
What does the formula describe?
Answer:
carbon and oxygen
Explanation:
c stands for carbon and o stands for oxygen
Camilla is asked to provide an example of a physical change that can occur as a result of the addition of heat. Which of the following could Camilla describe?
Group of answer choices
Liquid turning to solid
Solids getting smaller
Liquids gaining mass
Solids turning to liquids
which force is a noncontact force
Answer:
A magnet attracting metal
Determine how you would prepare 220 mL of a 0.500 M potassium hydroxide solution starting with: a) solid potassium hydroxide b) a 1.25 M potassium hydroxide solution
Answer:
a) 6.17 g of solid KOH
b) 88.0 mL of a 1.25 M potassium hydroxide solution
Explanation:
a) We have to determine the mass of solid potassium hydroxide that has to be weighed to prepare 220 mL of a 0.500 M potassium hydroxide solution. We will also require the molar mass of potassium hydroxide, KOH, 56.11 g/mol.
0.220 L × (0.500 mol/L) × (56.11 g/mol) = 6.17 g
b) We will use the dilution rule to determine the volume of the 1.25 M potassium hydroxide solution to be measured.
C₁ × V₁ = C₂ × V₂
V₁ = C₂ × V₂ / C₁
V₁ = 0.500 M × 220 mL / 1.25 M = 88.0 mL
How is compound XY different from elements X and Y?
Answer:
Compound XY contains the different atoms of X and Y while elements X and Y both contains the same atoms of X and Y respectively.
Find the explanation below.
Explanation:
An element is a substance that is composed of atoms of the same kind. For example, element X contains only atoms of X while element Y contains only atoms of Y. On the other hand, a compound is a substance made from the chemical combination of two or more elements, hence, a compound combines different atoms. This is the case of Compound XY as it contains different atoms of different elements.
Therefore, Compound XY is different from elements X and Y in the sense that Compound XY contains two different atoms from different elements (X and Y) while both elements X and Y are individually made up of only one type of atom each i.e. element X contain X atoms only and element Y contain Y atoms only.
PLES help me for brainless
Answer:
a 1 doesn't belong
Explanation:
Gas has fast moving molecules.
Liquids have slow moving molecules.
Solids have vibrating molecules.
