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lorasvet [3.4K]

4 years ago

11

A car rolls down a ramp. What is the force acting on the car that causes the movement down the ramp? A) acceleration B) centripe

tal C) friction D) gravity

1 answer:

Ann [662]4 years ago

7 0

The answer for the question is D.

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The distance time graphs for two objects are shown below: look at the picture. Which statement is true? Both objects move at var

mote1985 [20]

Answer:

The last statement is correct

Explanation:

4 0

3 years ago

Suppose that the volume of a particular sample of Cl2 is 718 mL at 675 mmHg and 48C at what temperature in C will the volume be

Kryger [21]

Answer:

1900 °C

Step-by-step explanation:

This looks like a case where we can use the <em>Combined Gas Law</em> to calculate the temperature.

p₁V₁/T₁ = p₂V₂/T₂ Multiply both sides by T₂

p₁V₁T₂/T₁ = p₂V₂ Multiply each side by T₁

p₁V₁T₂ = p₂V₂T₁ Divide each side by p₁V₁

T₂ = T₁ × p₂/p₁ × V₂/V₁

=====

Data:

We must convert the pressures to a common unit. I have chosen atmospheres.

p₁ = 675 mmHg × 1atm/760 mmHg = 0.8882 atm

V₁ = 718 mL = 0.718 L

T₁ = 48 °C = 321.15 K

p₂ = 159 kPa × 1 atm/101.325 kPa = 1.569 atm

V₂ = 2.0 L

T₂ = ?

=====

Calculation:

T₂ = 321.15 × 1.569/0.8882 × 2.0/0.718

T₂ = 321.15 × 1.766 × 2.786

T₂ = 321.15 × 1.569/0.8882 × 7.786

T₂ = 1580K

T₂ = 1580 + 273.15

T₂ = 1900 °C

<em>Note</em>: The answer can have only <em>two</em> significant figures because that is all you gave for the second volume of the gas.

4 0

3 years ago

Which is not true about all of these elements?

Digiron [165]

Answer:

umm it does not show what elements but I think its C. number of protons

8 0

3 years ago

Consider the calculation of the pressure in kilopascals exerted by 1.25 g of nitrogen gas in a flask of volume 250 mL (0.250 dm3

Harrizon [31]

The amount of the nitrogen gas, N₂ molecules present is 2.68×10²² molecules

<h3>Avogadro's hypothesis </h3>

1 mole of N₂ = 6.02×10²³ molecules

<h3>How to determine the mole of N₂</h3>

We'll begin by calculating the number of mole of N₂. This can be obtained as follow:

Mass of N₂ = 1.25 g
Molar mass of N₂ = 28.02 g/mol
Mole of N₂ =?

Mole = mass / molar mass

Mole of N₂ = 1.25 / 28.02

Mole of N₂ = 0.0446 mole

<h3>How to determine the molecules of N₂ present</h3>

From Avogadro's hypothesis,

1 mole of N₂ = 6.02×10²³ molecules

Therefore,

0.0446 mole N₂ = 0.0446 × 6.02×10²³

0.0446 mole N₂ = 2.68×10²² molecules

Thus, the molecules of N₂ present is 2.68×10²² molecules

Learn more about Avogadro's number:

brainly.com/question/26141731

#SPJ1

6 0

2 years ago

Why does Beryllium have a larger first Ionization energy than boron?

Nata [24]

This is an exception to the general electronegativity trend. It can be explained by looking at the electron configurations of both elements.

<span>Be:[He]2<span>s2
</span></span><span>B:[He]2<span>s2</span>2<span>p1

</span></span>

When you remove an electron from beryllium, you are taking away an electron from the 2s orbital. When you remove an electron from boron, you are taking an electron from the 2p orbital. The 2p electrons have more energy than the 2s, so it is easier to remove them as they can more strongly resist the effective nuclear charge of the nucleus.

7 0

4 years ago