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kozerog [31]
3 years ago
13

In what era did dinasours first appear?

Chemistry
1 answer:
jenyasd209 [6]3 years ago
8 0

The answer is the Mesozoic Era


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What is volume? What instrument is used to measure liquid volume? What formula is used to calculate the volume of a solid object
sertanlavr [38]

Answer:

Volume is the amount of space that a substance occupies. A graduated cylinder is used to measure liquid volume. The formula used to calculate the volume of a solid object is = L x W x H

Explanation:

8 0
3 years ago
Which is not a compound? A.They are substances B. They have compositions that vary C. They can be physically separated into thei
horsena [70]

Answer:

<em>D</em><em>.</em><em>They have properties similar to those of their component elements.</em><em> </em>

Explanation:

When elements are joined, the atoms lose their individual properties and have different properties from the elements they are made of .

8 0
3 years ago
How many molecules of hydrogen gas (Hz) are needed to produce 9.0 x 1023 molecules of H2O?
VashaNatasha [74]

Answer:

Explanation: Ammonia (NH3) is produced by the reaction of nitrogen gas and hydrogen gas. ... How many grams of fluorine gas are needed to produce 100.00g of AlF3? ... How many molecules of CO2 gas can be produced of 156.24g of benzene, ... (a) If 16.74.g of Fe and 9.0 9 of H2O are allowed to react, how many grams of products.

4 0
3 years ago
Basis for all living things; every living thing contains this element ​
kirza4 [7]

Answer:

Carbon

Explanation:

Carbon is the primary component of macromolecules, including proteins, lipids, nucleic acids, and carbohydrates.

6 0
3 years ago
Read 2 more answers
I need help asap!!!!
Butoxors [25]

Answer:

2H₂O₂ →  2H₂O + O₂

24.7 L are the liters of formed oxygen.

Explanation:

We state the reaction:

2H₂O₂ →  2H₂O + O₂

2 moles of peroxide decompose to 2 moles of water and 1 mol of oxygen gas.

We convert the mass to moles: 75 g . 1 mol / 34 g = 2.20 moles

As ratio is 2:1, per 2.20 moles of peroxide I would produce the half of moles, of O₂ → 2.20 /2 = 1.10 moles

We convert the moles to mass → 1.10 mol . 32 g / 1 mol = 35.3 g

Let's use oxygen's density to find out the volume

δ O₂ = 1.429 g/L    (mass/volume)

35.3 g . 1L / 1.429g = 24.7 L

6 0
3 years ago
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