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Bingel [31]
3 years ago
13

Find the momentum of a 120 g snowball that is rolling with a velocity of 8.9 m/s. Express your answer in two significant figures

.
show your work pls
Chemistry
1 answer:
Tju [1.3M]3 years ago
8 0

Answer:

30kg m/s.

Explanation:

30 kg m/s

Explanation

Momentum = Mass × Velocity = 10 kg × 3 m/s = 30 kg m/s

Its momentum is 30 kg m/s.

Explanation:

Momentum is defined by the following equation:

p=mv

where m is the mass of the object in kilograms, v is the velocity of the object in meters per second

p=10 kg⋅3 m/s

=30 kg m/s

Also nice photo.

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Brilliant_brown [7]

Answer : The oxidation state of Mg in Mg(s) is (0).

Explanation :

Oxidation number or oxidation state : It represent the number of electrons lost or gained by the atoms of an element in a compound.

Oxidation numbers are generally written with the sign (+) and (-) first and then the magnitude.

Rules for Oxidation Numbers are :

The oxidation number of a free element is always zero.

The oxidation number of a monatomic ion equals the charge of the ion.

The oxidation number of  Hydrogen (H)  is +1, but it is -1 in when combined with less electronegative elements.

The oxidation number of  oxygen (O)  in compounds is usually -2.

The oxidation number of a Group 17 element in a binary compound is -1.

The sum of the oxidation numbers of all of the atoms in a neutral compound is zero.

The sum of the oxidation numbers in a polyatomic ion is equal to the charge of the ion.

The given chemical reaction is:

Mg(s)+2H_2O(l)\rightarrow Mg(OH)_2(s)+H_2(g)

In the given reaction, the oxidation state of Mg in Mg(s) is (0) because it is a free element and the oxidation state of Mg in Mg(OH)_2 is (+2).

Hence, the oxidation state of Mg in Mg(s) is (0).

3 0
3 years ago
Explain whether nitrogen atoms will form bonds with other atoms
iren2701 [21]
The closer the atoms are the more the nitrogen will be come bigger or the oppisite

3 0
3 years ago
How is a mole defined?​
sattari [20]

A mole of a substance is defined as: The mass of substance containing the same number of fundamental units as there are atoms in exactly 12.000g of 12C. Fundamental units change depending on the substance.

6 0
3 years ago
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What is the solution to the problem expressed to the correct number of significant figures 102900/12 +170•1.27
Morgarella [4.7K]

The solution to the problem (102 900 ÷ 12) + (170 × 1.27) = 8800.

<u>Explanation</u>:

Step 1.

Evaluate the expressions inside the parentheses (PEMDAS)

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170 × 1.27 = 215.9

In multiplication and division problems, your answer can have no more significant figures than the number with the fewest significant figures.

Thus, the underlined digits are not significant, but we keep them in our calculator to avoid roundoff error.

Step 2.

Do the addition (PEMDAS).

8575 + 215.9 = 8790.9

Everything that you add to an insignificant digit gives an insignificant digit as an answer.

Thus, the underlined digits are not significant.

We must drop them and round up the answer to 8800.

4 0
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That would be C, a cast. It is similar to the process of filling a mold with foam or clay, which is also called a cast.
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