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3 years ago

Because of the law of motion there are no limits on how fast the roller coaster can go true or false.

Chemistry

1 answer:

Lelechka [254]3 years ago

7 0

Answer False

Explanation: Friction makes it stop at some point. For it to have an unlimited speed goes against beset is first law that states an object in motion with stay in motion unless acted upon by an external force, your force will be the friction of the wheels on the roller coaster

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Chalcopyrite, the principal ore of copper (Cu), contains 34.63 percent Cu by mass. How many grams of Cu can be obtained from 7.3

DENIUS [597]

Answer:

$2.55\times 10^{6}g$ Cu can be obtained from $7.35\times 10^{3}kg$ ore

Explanation:

1 kg = 1000 g

So, mass of ore is $(7.35\times 10^{3}\times 1000)g$ = $7.35\times 10^{6}g$

Now, 100 g of ore contains 34.63 g of Cu

So, $7.35\times 10^{6}g$ ore contains $\frac{(34.63g)\times (7.35\times 10^{6}g)}{100g}$ Cu or $2.55\times 10^{6}g$ Cu.

6 0

4 years ago

What is the best conclusion according to the energy diagram of the chemical reaction?

Rashid [163]

Answer:

The reaction will absorb energy

Explanation:

A potential energy diagram shows the energy changes that occur during a chemical reaction. It is also called a reaction progress curve. The diagram shows the changes that occur as reactants are converted into products.

The best conclusion according to the energy diagram of the chemical reaction is that the reaction will absorb energy.

5 0

3 years ago

Marble(calcium carbonate) reacts with hydrochloric acid(hcl) to form calcium chloride solution, water, and carbon dioxide. Find

Leni [432]

Answer:

When calcium carbonate reacts with hydrogen chloride, it reacts to form calcium chloride, carbon dioxide, and water. If this reaction occurs with 51.6% yield, what mass of carbon dioxide will be collected if 16.93 g of CaCO3 is added to sufficient hydrogen chloride

3 0

3 years ago

ANSWER ASAP!

ludmilkaskok [199]

Answer:

whats the question so i can answer?

6 0

3 years ago

Copper has two naturally occurring isotopes, 63Cu (isotopic mass 62.9296 amu) and 65Cu (isotopic mass 64.9278 amu). If copper ha

Semenov [28]

Answer:

Percentage of first isotope = 69.152 %

Percentage of second isotope = 30.848 %

Explanation:

The formula for the calculation of the average atomic mass is:

$Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})$

Given that:

For first isotope:

Let % = x %

Mass = 62.9296 amu

For second isotope:

% = 100 - x % (Since, there are only two isotopes)

Mass = 64.9278 amu

Average mass = 63.546 amu

Thus,

$63.546=\frac {x}{100}\times {62.9296}+\frac {(100-x)}{100}\times {64.9278}$

Solving,

1.9982 x = 138.18

Thus,

<u>Percentage of first isotope = x = 69.152 %</u>

<u>Percentage of second isotope = 100 - x % = 30.848 %</u>

5 0

4 years ago