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ryzh [129]
3 years ago
9

PLEASE HELP I KNOW THERES A LOT OF QUESTIONS BUT PLEASEEEE!!!!

Chemistry
2 answers:
jekas [21]3 years ago
6 0

Answer:

??

Explanation:

ollegr [7]3 years ago
3 0
This is your whole test why would I answer that I’m not that smart
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What kind of radioactive element is useful for dating an object?
OlgaM077 [116]

The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.

<h3>What are radioactive elements?</h3>

Radioactive elements are elements that involved in radioactivity and this comprises of atoms or particles in their nuclei whose atomic nuclei are not stable and they emit radiations to maintain stability.

Therefore, The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.

Learn more about radioactive elements below.

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4 0
2 years ago
What is the difference between fusion and melting?
photoshop1234 [79]
Fusion is joining two or more things together in resulting of the form of one thing
Melting is to make something liquefied by the use of heat
4 0
3 years ago
15. Within a voltaic cell,___
kobusy [5.1K]

Answer:

B. oxidation; reduction

Explanation:

A voltaic cell is electro-chemical cell in which chemical energy is converted into electrical energy.

1. This cell utilizes chemical reaction to generate electric.\

2. there two electrode anode and cathode

3. At Anode oxidation occurs

4. At cathode reduction occurs

5. chemical is present in the cell which is electrolyte which completes the circuit of the voltaic cell.

  • oxidation is the process in which there is loss of electrons
  • Reduction is the process in which there is gain of electrons

___________________________________________________

Based on above discussion

At anode oxidation takes place

At cathode reduction takes place.

Hence, correct option is B. oxidation; reduction

7 0
3 years ago
Help please fast as possible I’ll mark you brainlist
Sergeeva-Olga [200]

Answer:

As mass increases the gravitational force increases

Explanation:

Things with mass gain a gravitational force, The bigger they are the more force, for example: the sun is the biggest so it pull us

7 0
3 years ago
5. How much heat (in calories) is absorbed by a reaction when
Wewaii [24]

Answer:

1.2 × 10⁴ cal

Explanation:

Given data

  • Mass of water (m): 300 g
  • Initial temperature: 80 °C
  • Final temperature: 40°C

We can calculate the heat released by the water (Q_w) when it cools using the following expression.

Q_w = c \times m \times (T_f - T_i)

where

c is the specific heat capacity of water (1 cal/g.°C)

Q_w = \frac{1cal}{g.\°C}  \times 300g \times (40\°C - 80\°C) = -1.2 \times 10^{4} cal

According to the law of conservation of energy, the sum of the heat released by the water (Q_w) and the heat absorbed by the reaction (Q_r) is zero.

Q_w + Q_r = 0\\Q_r = -Q_w = 1.2 \times 10^{4} cal

7 0
3 years ago
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