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3 years ago

When a log burns in a fire, a a physical change has occurred. b mass is gained. c new substances are formed.

Chemistry

2 answers:

Pavlova-9 [17]3 years ago

8 0

Answer: technically it is chemical and physical change

Explanation: chemical bc it’s burning and physical bc it’s going from a log to ashes

Zepler [3.9K]3 years ago

5 0

Answer:

C! New substances are formed.

Explanation:

The burning log will release carbon dioxide, which is a new substance that was never there in the first place.

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The gravitational strength at te poles is greater than the gravitational strength at the equator. what will happen to an object

amid [387]

Answer:

Explanation:

The weight will decrease.

Because the value of acceleration due to gravity is decreasing thus the weight of object will also decrease.

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3 years ago

Energy transfer by convection is usually restricted to what type of substance? A. Solids only

Lunna [17]

My thought would be B) gases.

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4 years ago

What is the amount, in moles, of each elemental sample? a. 11.8 g Ar b. 3.55 g Zn c. 26.1 g Ta d. 0.211 g Li

spayn [35]

Answer:

A. 0.295 mole

B. 0.055 mole

C.0.144 mole

D. 0.03 mole

Explanation:

To find the amount in moles, we simply use a mathematical relation that connects mass, atomic mass and number of moles.

Number of moles = mass/atomic mass

A. Atomic mass of Argon is 40

n = 11.8/40 = 0.295 mole

B. Atomic mass of zinc is 65

n = 3.55/65 = 0.055 mole

C. Atomic mass of Tantalum is 181

n = 26.1/181 = 0.144 mole

D. Atomic mass of lithium is 7

n = 0.211/7 = 0.03 mole

8 0

3 years ago

A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?

Softa [21]

Explanation:

Photovoltaic means electricity from light

photo = light voltaic = electricity

SUNLIGHT is the answer

Hope this is correct

HAVE A GOOD DAY!

3 0

3 years ago

Read 2 more answers

Vegetable oil has a specific heat of 1.67/* Calculate the heat required (in kilojoules) to raise the temperature of 500 g of

Nady [450]

Answer:

$Q=108.55kJ$

Explanation:

Hello,

In this case, we can compute the required heat by using the following equation:

$Q=mCp(T_2-T_1)$

Thus, by considering the given mass, specific heat and both initial and final temperature, we obtain:

$Q=500g*1.67\frac{J}{g\°C} *(150.0\°C-20.0\°C)*\frac{1kJ}{1000J} \\\\Q=108.55kJ$

Regards.

5 0

3 years ago