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torisob [31]
3 years ago
9

Please help! Urgent!!!

Chemistry
2 answers:
horsena [70]3 years ago
4 0
A - mixing baking soda and vinegar to make bubbles of carbon dioxide
I am Lyosha [343]3 years ago
3 0
Mixing baking soda and vinegar to make bubbles of carbon dioxide.
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Zinaida [17]

Answer:

6. 7870 kg/m³ (3 s.f.)

7. 33.4 g (3 s.f.)

8. 12600 kg/m³ (3 s.f.)

Explanation:

6. The SI unit for density is kg/m³. Thus convert the mass to Kg and volume to m³ first.

1 kg= 1000g

1m³= 1 ×10⁶ cm³

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Volume of iron bar

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= 8.16 ÷ 10⁶

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= 7870 kg/m³ (3 s.f.)

7.

\boxed{mass = density \:  \times volume}

Mass

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= 33.408 g

= 33.4 g (3 s.f.)

8. Volume of brick

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=  \frac{0.151} {1.25 \times 10^{ - 5} }  \\  = 12600 \: kg/ {m}^{3}

(3 s.f.)

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