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3 years ago

The seasons are caused by

Chemistry

2 answers:

julsineya [31]3 years ago

5 0

Answer:

Rotation of the Earth.

As the Earth rotates, places on Earth get farther from the Sun and make seasons.

azamat3 years ago

3 0

Answer:

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun

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What happens when the sun beats up the earth

frozen [14]

Then we all die because the sun would blow up the earth.

7 0

2 years ago

A 256 mL sample of HCl gas is in a flask where it exerts a force (pressure) of 67.5 mmHg. What is the pressure of the gas if it

Effectus [21]

Answer:

The pressure in the new flask would be $128\; \rm mmHg$ if the $\rm HCl$ here acts like an ideal gas.

Explanation:

Assume that the $\rm HCl$ sample here acts like an ideal gas. By Boyle's Law, the pressure $P$ of the gas should be inversely proportional to its volume $V$ .

For example, let the initial volume and pressure of the sample be $V_1$ and $P_1$ . The new volume $V_2$ and pressure $P_2$ of this sample shall satisfy the equation: $P_1 \cdot V_1 =P_2 \cdot V_2$ .

In this question,

The initial volume of the gas is $V_1= 256\; \rm mL$ .
The initial pressure of the gas is $P_1 = 67.5\; \rm mmHg$ .
The new volume of the gas is $V_2 = 135\; \rm mL$ .

The goal is to find the new pressure of this gas, $P_2$ .

Assume that this sample is indeed an ideal gas. Then the equation $P_1 \cdot V_1 =P_2 \cdot V_2$ should still hold. Rearrange the equation to separate the unknown, $P_2$ . Note: make sure that the units for $V_1$ and $V_2$ are the same before evaluating. That way, the unit of

$\begin{aligned} & P_2\\ &= \frac{P_1 \cdot V_1}{V_2} \\ &= \frac{256\; \rm mL \times 67.5\; \rm mmHg}{135\; \rm mL} \\ & \approx 128\; \rm mmHg\end{aligned}$ .

3 0

3 years ago

What is the difference between a physical change and a chemical change? (2 points)

charle [14.2K]

A physical change does not change the identity of the substance but the chemical change does.

Example

If you tear or shred a piece of paper it is still paper, but if you pour chemicals on it it will probably change to something else.

7 0

2 years ago

Read 2 more answers

Does a laboratory balance measure mass or weight

kolezko [41]

A balance in a lab measures the weight of a substance or object.
Weight is the mass of the body x the gravitation pull on the mass of the object.

So the mass of the object can be found by dividing the weight by gravitational constant.

The gravitational constant on earth is 1. so if a balance says that a substance weighs 300g then its mass is also 300g on earth because 300/1 = 300.

Hope that helps :)

5 0

3 years ago

In a car, the ________ energy in gasoline is burned to create heat energy, which is converted to ________energy

elixir [45]

<span>chemical is converted into mechanical energy.</span>

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2 years ago

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The seasons are caused by ​

The seasons are caused by