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4 years ago

NEED HELP PLEASE

1 answer:

8 0

A/a physical change is when an object goes through a natural change such as weather etc.
B/ the different is that 1) chemical change is more quick to change rather than physical (ex: I’d there is rocks flying around and is wearing down another rock it would take longer rather than acid)

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What type of elements are most likely to form more than one type of ion

ss7ja [257]

Metals are the type of elements that are most likely to form more than one type of ion, for instance iron can form the ion of Fe^2+ or Fe^3+.

7 0

4 years ago

Read 2 more answers

The Gateway Arch in St. Louis, MO is approximately 630 ft tall. How many U.S. half dollars would be in a stack of the same heigh

zhannawk [14.2K]

Answer:

To equal the height of the Gateway Arch in St. Louis, it would take <u>76810 half dollars. </u>

Explanation:

If the Gateway Arch in St. Louis is 630 feet high, how many half dollars will it take to equal the height if each half dollar is 2.15mm thick?

First, we convert the ft to cm and the cm to mm.

- 1 ft = 30.48 cm

630 ft = 19202.4 cm

- 19202.4 cm = 192024 mm

Now, if a half dollar is 2.15 mm thick, how many half dollars would it take to equal the height of 192024 mm?

1 half dollar = 2.15 mm

X = 192024 mm

X = 192024 mm / 2.15 mm

X = 76810 half dollars.

5 0

3 years ago

If the mass of a block of wood is 4.6g and the density is 0.98g/mL what is the volume.

irina [24]

Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

$volume = \frac{mass}{density} \\$

From the question

mass of wood = 4.6 g

density = 0.98 g/mL

It's volume is

$volume = \frac{4.6}{0.98} \\ = 4.69387755...$

We have the final answer as

Hope this helps you

3 0

4 years ago

What is the weight in grams of 3.36 x 10^23 molecules of copper sulfate

Llana [10]

Answer:

$m=89.0g$

Explanation:

Hello!

In this case, since we are given the formula units (molecules) of copper sulfate, it is possible to compute the moles of this compound via the Avogadro's number:

$n=3.36x10^{23}molecules*\frac{1mol}{6.022x10^{23}molecules}\\\\n=0.558mol$