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photoshop1234 [79]
3 years ago
10

A race car travels 800 kilometers in 2 hours during a race. What was the average speed of the race car in km/hr.

Chemistry
2 answers:
bonufazy [111]3 years ago
5 0
400km/hr. Simply divide total km travelled by the amount of hours it took to find your answer.
Sunny_sXe [5.5K]3 years ago
3 0

Answer:

400

you will get this answer if you do distance divided by time.

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Maria walked on a beach made mostly of sand. She walked barefoot
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A: The atoms in the sand were moving more quickly
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2 years ago
If the radius of copper is 0.128 nm, what is the pd of the (100) plane for copper in m-2?
kolbaska11 [484]

Copper has a FCC i.e. face centered cubic crystal structure. The 100 plane is essentially a planar section of the cubic cell where 4 Cu atoms occupy the 4 corners of the plane along with 1 Cu atom at the center of that plane. Each of the Cu atoms in the corners is shared by 4 adjacent unit cells. Thus, there are 2 Cu atoms present in the 100 plane (4*1/4 + 1 = 2).

Now, the planar density PD along the 100 plane is given as:

PD(100) = # atoms in the 100 plane/Area of 100 plane

            = \frac{2}{8R^{2} }

Here R = radius = 0.128 nm = 0.128*10^{-9} m

PD = \frac{2}{8*(0.128*10^{-9}) ^{2} } = 1.526*10^{19} m^{-2}

6 0
3 years ago
two substances react and the mass is recorded.The mass of the products does not equal the mass of the reactants .Which is the be
Dovator [93]
Mass can’t be destroyed. So since not all the mass was found in the products, that simply means that it was lost to the environment. For example, let’s say hydrogen and oxygen are the reactants and we get water in the product. Now that oxygen could have reacted with something else that we didn’t take into account when measuring the mass of the H2O released.

Tldr, some of the reactants were lost to the surroundings
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How many moles of N are in 0.241 g of N2O?
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Read 2 more answers
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lubasha [3.4K]
Ionic bonds involve a cation and an anion. The bond is formed when an atom, typically a metal, loses an electron or electrons, and becomes a positive ion, or cation. Another atom, typically a non-metal, is able to acquire the electron(s) to become a negative ion, or anion.

One example of an ionic bond is the formation of sodium fluoride, NaF, from a sodium atom and a fluorine atom. In this reaction, the sodium atom loses its single valence electron to the fluorine atom, which has just enough space to accept it. The ions produced are oppositely charged and are attracted to one another due to electrostatic forces.
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3 years ago
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