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3 years ago

Balance the equation. SiO2 + CaC2 → Si + CaO + CO2

Chemistry

1 answer:

Sunny_sXe [5.5K]3 years ago

6 0

Co2 is oxygen because that what you took to ask ppl for

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Which is characteristic of reliable experimental results?

storchak [24]

Answer:

B. The data were reproduced by other scientists using the same experimental methods.

Explanation:

One of the features of reliable experimental results is their reproducibility — other scientists must be able to produce them.

A. is wrong. An experiment that is designed to prove a hypothesis is biased.

C. is wrong. A conclusion based on a single experiment is suggestive but not conclusive. It takes a number of experiments to provide a strong statistical relation between the variables.

D. is wrong. The data may support a conclusion that the they reached using logic and critical thinking, but there may still be a flaw in the thinking, which other scientists can point out.

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3 years ago

About how many days does it take to go from one moon phase to another

Ivan

Answer:

After one month, the Moon returns to the same location in the sky as the Sun and we see a New Moon again. The demo represents a month as 28 days for simplicity. But the real cycle of phases takes 29.5 days to complete.

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3 years ago

A sample of neon occupies a volume of 752 ml at 25 0

lyudmila [28]

$V_{initial} = 752\:mL$
$T_{initial} = 25.0^0C$
converting to Kelvin
TK = TC + 273
TK = 25.0 + 273 → TK = 298.0 → $T_{initial} = 298.0\:K$
$V_{final} = ? (in\:milliliters)$
$T_{final} = 50.0^0C$
TK = TC + 273
TK = 50.0 + 273 → TK = 323.0 → $T_{final} = 323.0\:K$

By the first Law of Charles and Gay-Lussac, we have:
$\frac{ V_{i} }{ T_{i} } = \frac{ V_{f} }{ T_{f} }$

Solving:
$\frac{ V_{i} }{ T_{i} } = \frac{ V_{f} }{ T_{f} }$
$\frac{ 752 }{ 298.0 } = \frac{ V_{f} }{ 323.0 }$
Product of extremes equals product of means:
$298.0* V_{f} = 752*323.0$
$298.0 V_{f} = 242896$
$V_{f} = \frac{242896}{298.0}$
$\boxed{\boxed{V_{f} \approx 815.08\:mL}}\end{array}}\qquad\quad\checkmark$

5 0

3 years ago

Increase food supplies in an ecosystem decrease competition because the competing organsims would

irga5000 [103]

The competing organisms would eventually outnumber the competition

6 0

3 years ago

what force is necessary for a zookeeper to lift a sedated lion with a total mass of 175 kg with an upward acceleration of .65 m/

BabaBlast [244]

I dont know how to do this but i think maybe you would probably subtract.....

4 0

3 years ago