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Taya2010 [7]
3 years ago
6

A baseball strikes the roof of a car and dents it. The paint on the roof begins to crack and chip, exposing the metal. The expos

ed metal on the roof rusts, eventually causing a small hole in the roof. 17. Which event is a chemical change? The baseball strikes the roof The roof of the car dents The paint cracks and chips The exposed metal rusts​
Chemistry
2 answers:
kakasveta [241]3 years ago
5 0
The exposed metal rust
s2008m [1.1K]3 years ago
4 0

Answer:

The exposed metal rusts is an example of a chemical change because rust is an example of a chemical change in objects for example bicycles, scooters, etc.

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This image represents a(n)
Katena32 [7]

Answer:

mixture of nitrogen B

Explanation:

ok

7 0
3 years ago
Read 2 more answers
A prescription medication requires 5.98 mg per kg of body weight.
valkas [14]

<u>Answer:</u>

<u>For A:</u> The 0.0132 grams is required per pound of the body weight.

<u>For B:</u> The dost required for 191 lb patient is 5.96 grams.

<u>Explanation:</u>

  • <u>For A:</u>

We are given:

Medication requirement = 5.98 mg/kg

To convert the given amount in grams per pounds, we use the conversion factor:

1 kg = 2.20462 lb

1 g = 1000 mg

Converting the value into grams per pounds, we get:

\Rightarrow (\frac{5.98mg}{kg})\times (\frac{1g}{1000mg})\times (\frac{2.20462lb}{1kg})\\\\\Rightarrow 0.0132g/lb

Hence, the 0.0132 grams is required per pound of the body weight.

  • <u>For B:</u>

To calculate the amount of medication for 191 lb patient, we use unitary method:

For 1 lb body weight, the amount required is 0.0132 grams.

So, for 191 lb body weight, the amount required is \frac{0.0312g}{1lb}\times 191lb=5.96g

Hence, the dost required for 191 lb patient is 5.96 grams.

5 0
4 years ago
Why are lager astronomical bodies such as planets and stars round?
Katyanochek1 [597]
Gravity pulls mass towards its center, therefore as matter is pulled towards a source of gravity it will naturally coalesce into a ball as matter competes to head towards the source of gravity.
5 0
3 years ago
Read 2 more answers
1. Round each of the following numbers to four significant figures, and express the result in scientific notation:
vfiekz [6]

The rounding up of the aforementioned number to four significant figures is as follows: 3.002 × 10²

<h3>What are significant figures?</h3>

Significant figures are figures that contribute to the general and overall value of the whole number.

Significant figures or digits are specifically meaningful with respect to the precision of a measurement.

Although, the original number given in this question has 9 significant figures, the number; 300.235800 can be rounded up to four significant figures as follows:

  • Decimal notation: 300.2
  • No. of significant figures: 4
  • No. of decimals: 1
  • Scientific notation: 3.002 × 10²

Therefore, the rounding up of the aforementioned number to four significant figures is as follows: 3.002 × 10².

Learn more about significant figures at: brainly.com/question/14359464

#SPJ1

3 0
2 years ago
Mass in mg<br> salt<br> sugar<br> chalk<br> sand<br> water
STALIN [3.7K]
Its 470mg k dude or dudette
6 0
3 years ago
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