CHEMISTRY HIGH SCHOOL

What types of reactions is shown below? check all that apply 2H2O2–>2H2O+O2 A) synthesis
B) decomposition
C) combustion

Answers

Answer 1

Answer:

Answer:

Type of reactions :

Decomposition (O is seperated)

Answer 2

Answer: B is the answer to your question ....

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During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?

A...thermal energy to chemical energy

B....electromagnetic energy to chemical energy

C....kinetic energy to potential energy

D...potential energy to chemical energy

Answers

The change is thermal energy to chemical energy. Sugar contains a lot of chemical potential energy which is why living things use it as a source of energy. The process of photo synthesis takes light from the sun to convert carbon dioxide and water into sugar and oxygen. That process is basically turning the thermal energy from the light into chemical energy in the sugar.

I hope this helps. Let me know if anything is unclear.

During photosynthesis, sunlight shining on a plant is absorbed. The energy transformation occurs during this process is thermal energy to chemical energy.

What is photosynthesis?

Photosynthesis is a process by which the plants make their food. The process takes sunlight, water, and chlorophyll into food.

Thus, the correct option is A.thermal energy to chemical energy.

Learn more about photosynthesis

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You are using a calorimeter to calculate the specific heat capacity of a metallic ore. The calorimeter contains 0.50 kilograms of water at room temperature (22 °C). We heat the ore in boiling water and then drop the metal into the calorimeter and wait for the water and metal to reach the same temperature. The mass of the ore is 3.5 kilograms. We find that the water has increased in temperature to 24.3 °C. Recall that the specific heat of water is 4.18 J/g–°C. Calculate the specific heat capacity of the ore.

Answers

the specific heat capacity of the ore : 0.018 J/g°C

Further explanation

In the calorimeter, the heat received is the same as the heat released

Q abs = Q release

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

Q released by a metallic ore and absorbed by water at calorimeter

Q ore = Q water

Q water

m = 0.5 kg = 500 g

c = 4.18 J/g–°C.

Δt = 24.3 - 22 = 2.3

$\tt Q=m.c.\Delta t\n\nQ=500* 4.18* 2.3=4807~J$

the specific heat capacity of the ore.

Q ore = Q water = 4807 J

m ore = 3.5 kg = 3500 g

Δt = 100 - 24.3 = 75.7

$\tt 4807=3500* c* 75.7\n\nc=0.018~J/g^oC$

The temperature T in Kelvin is 273.15 more than temperature C in degrees Celsius. Use your function to find the equivalent temperature in Kelvin for 100*C.

Answers

Answer:

T(K) = 373.15 K

Explanation:

The kelvin is the base unit of temperature in the International System of Units (SI). The symbol used to express temperature in kelvins is K.

The temperature of zero kelvins is called the absolute zero. It is considered to be the lowest possible temperature, although nothing has reached it. The absolute zero (0K) is - 273.15 degrees Celsius.

This is the equation we can use to solve this question:

$T(K) = T(C) + 273.15$

We have 100*C.

$T(C) = 100 C$

$T(K) = 100C + 273.15$

$T(K) = 373.15 K$

Which method can be used to make a reliable guess that a victim was under 17 years old?A) look for flat-bladed incisors
B) look for presence or absence of wisdom teeth
C) multiply the internal distance in centimeters between the coronoid processes by the external distance in centimeters between the jaw angles(mandibular angles)
D) look for shovel shaped incisors
(It's not C)

Answers

Answer:

B) look for presence or absence of wisdom teeth

Explanation:

The only way to make a reliable guess if a victim was under 17 years old is by looking if he already had the wisdom teeth, this teeth are located in the back of the mouth, and are the third molars that humans develop after the age of 17 or 18 years on average, some could develop them after.

B-Look for the presence or absenceof wisdom teeth

Question #21TrueFalse The general name for a substance added to a reaction that affects the rate but is not consumed in the reaction is called a complex a. True
b. False

Answers

The statement above about “The general name for a substance added to a reaction that affects the rate but is not consumed in the reaction is called a complex” is false. The answer is letter B. It should be the enzyme, not the complex.

While driving your rental car on your trip to Europe, you find that you are getting 9.7 kilometers per liter of gasoline. What does this correspond to in miles per gallon?

Answers

The given value is $9.7 km/L$

Since, $1 km = 0.62 mile$ so:

$9.7 km = 9.7 km * 0.62 miles/km$ = $6.014 miles$

Since, $1 L = 0.2199 galon$ so:

$9.7 km/L = (6.014 miles)/(0.2199 galon)$

$27.35 miles/ galon$

Hence, 9.7 kilometers per liter of gasoline is $27.35 miles/ galon$ .

While driving your rental car on your trip to Europe, you find that you are getting 9.7 kilometers per liter of gasoline. We know that 1 mile is equal to 1.609 kilometers. So divide 9.7 kilometers by 1.609 kilometrs/mile and you will get 6.03 miles per gasoline

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