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KengaRu [80]
3 years ago
8

Sponges, Cnidarians, Flatworms, and Roundworms are all in which group of animals?

Chemistry
1 answer:
Westkost [7]3 years ago
3 0
These animals are all invertebrates
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2. A rock occupies a volume of 20 cm and has a mass of 54 grams. Find the density of<br> this rock.
vredina [299]
The answer is 2.7gm/cm^3 . Density is mass divided by volume .
6 0
3 years ago
Water is composed of one atom of oxygen and two atoms of
egoroff_w [7]

Answer:

<em>Hydrogen.</em>

Explanation:

You've probably seen "H_{2}0" which is the formula for water. It means that there's 2 hydrogen atoms, and one oxygen atom, in one molecule of water.

<em>Hope this helps! Feel free to mark me Brainliest if you feel this helped. :)</em>

3 0
3 years ago
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What are chemical reaction​
scoray [572]
  • The reaction in which we can't take back the product to reactant form .Or in simple words the reaction which is irreversible is called chemical reaction

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We cannot pull back the reaction to get wax back .

3 0
2 years ago
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A 250-mL aqueous solution contains 1.56 10–5 g of methanol and has a density of 1.03 g/mL. What is the concentration in ppm?
Hoochie [10]
First, calculate for the mass of the aqueous solution by multiplying the given volume (in mL) by the density (in g/mL). In mathematical equation, that is,

        m = ρV

where m is mass, ρ is density, and V is volume. Substituting the known values,

      m = (1.03 g/mL)(250 mL) = 257.5 g

To get the concentration in ppm, divide the given mass of methanol by the mass of the solution. Note that the parts-per million (ppm) is equal to mass of solute in milligram(mg) divided by the mass of solution in kilogram (kg)

      C (in ppm) = (1.56 x 10^-6 g)(1000 mg/1 g)   / (257.5 g)(1 kg/1000 g)

Simplifying,
     C (in ppm) = (1.56 x 10^-3 mg)/ 0.2575 kg

     C (in ppm) = 0.00606 ppm

<em>Answer: 0.00606 ppm</em>
     
7 0
3 years ago
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A car travels 65 miles in 1 hour. What is the average speed of the car?​
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It would be 65 miles per hour
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3 years ago
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