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3 years ago

What happens when a penny is dropped from a height of 20 meters?

Chemistry

1 answer:

ANEK [815]3 years ago

6 0

Answer:

A) The force of gravity causes it to accelerate.

Explanation:

Gravity is the force that pulls everything down to earth. The force is caused by attraction between objects. The bigger an object, the stronger its force it.

The formula for gravity is (m)(a), mass times acceleration. Acceleration means the object increases its speed over time.

B) The mass is the matter that makes up an object. It does not change as it is falling.

C) The direction does not change because it is being pulled straight down.

D) Gravity causes acceleration because as the object nears Earth, the force of attraction is stronger.

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Which best describes a similarity between power plants that use water as an energy source and those that use wind as an energy s

elixir [45]

Answer:

Both use kinetic energy to produce electricity.

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3 years ago

A scientist notices that a lump of niobium is warm to the touch and wonders if nuclear reactions are taking place in the metal.

Sedaia [141]

Of the answers listed option B looks like the most complete. Ie "Check for the presence of alpha, beta, and gamma particles." the significant presence of these particles is a specific indicator of radioactive decay, i.e: unstable atoms spontaneously undergoing a nuclear reaction.

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3 years ago

Read 2 more answers

Strike anywhere matches contain the compound tetraphosphorus trisulfide, which burns to form tetraphosphorus decaoxide and sulfu

erica [24]

Answer:

194.6 mL of SO₂

Explanation:

The reaction that takes place is:

P₄S₃ + 6O₂(g) → P₄O₁₀ + 3SO₂(g)

To solve this problem we need to use PV=nRT, so first let's convert the given units:

23.8 °C → 23.8 + 273.15 = 296.95 K

747 torr → 747/760 = 0.983 atm

We need to calculate V, so in order to do that we calculate n, using the mass of the reactant (P₄S₃):

0.576 g P₄S₃ * $\frac{1molP_{4}S_{3}}{220gP_{4}S_{3}} *\frac{3molSO_{2}}{1molP_{4}S_{3}}$ = 7.85 * 10⁻³ mol SO₂ = n

Now we calculate V:

PV=nRT

0.983 atm * V = 7.85 * 10⁻³ mol * 0.082 atm·L·mol⁻¹·K⁻¹ * 296.95 K

V = 0.1946 L

Finally we convert L into mL:

0.1946 * 1000 = 194.6 mL

8 0

3 years ago

Consider the following reaction between mercury(II) chloride and oxalate ion.

Alina [70]

Answer: The rate law of the reaction is $\text{Rate}=k[HgCl_2][C_2O_4^{2-}]^2$

Explanation:

Rate law is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

For the given chemical equation:

$2 HgCl_2(aq.)+C_2O_4^{2-}(aq.)\rightarrow 2Cl^-(aq.)+2CO_2(g)+Hg_2Cl_2(s)$