3 years ago

PLEASE HELP ME ITS DUE TODAY!!!

Chemistry

2 answers:

katovenus [111]3 years ago

7 0

D. African plate I gave you true answer

vova2212 [387]3 years ago

5 0

D. The African Plate

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Andre45 [30]

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Fossils: 3.5 billion. Rocks: 4.28 billion

they were found during Haden Eon

Explanation:

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3 years ago

Does a animal cell have a cell wall and chloroplasts

sergiy2304 [10]

Answer:

Animal cells have centrosomes (or a pair of centrioles), and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not.

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3 years ago

If an object has a density of 4.2 g/mL, what is its density in hg/L?

alekssr [168]

I believe "h" stands for hecta-, which means "one hundred."

I will convert from g to hg (divide by 100), then from mL to L (multiply by 1000).

$\frac{4.2g}{mL}*\frac{1hg}{100g}*\frac{1000mL}{1L}=42\frac{hg}{L}$

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3 years ago

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How many grams of sodium nitrate does it take to get 3.5% sodium nitrate in a 250g solution?

Sliva [168]

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4 years ago

How many grams of Pb are there in a sample of Pb that contains 1.15×1024 atoms? grams

Ipatiy [6.2K]

<h3>Solution:</h3>

$\text{mass of Pb = 1.15 × 10²⁴ Pb atoms} × \frac{\text{1 mol Pb}}{\text{6.022 × 10²³ Pb atoms}} × \frac{\text{207.2 g Pb}}{\text{1 mol Pb}}$

$\boxed{\text{mass of Pb = 396 g}}$

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3 years ago