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2 years ago

Can someone help with this please? greatly appreciated!

Chemistry

1 answer:

maw [93]2 years ago

7 0

Answer:

Explanation:

a) When the iron rod is heated, it expands (gets larger). That's the key to this whole procedure. It doesn't expand much -- depending on what temperature the iron rod is heated up to.

When the rod looks like it has expanded as much as it can, the rod is tightened as much as it can be tightened before damage is done. When the rod cools, it contracts (gets smaller). That brings the walls closer together or it stops the walls from bulging.

Very interesting question. I've never seen this. Thanks for asking.

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A material was cooled from 100°C to 40°C. What is the temperature change?

vazorg [7]

The answers D) -60
Just subtract

8 0

2 years ago

A sample of lead has a density of 11.3 g/cm3 and a mass of 123 grams, what is the volume of the sample?

SVEN [57.7K]

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 = 123 g

density = 11.3 g/cm³

The volume is

$volume = \frac{123}{11.3} \\ = 11.18181818...$

We have the final answer as

Hope this helps you

3 0

2 years ago

1) If calcium were to combine with the compound barium nitrate, which member of the barium nitrate would calcium replace?

snow_tiger [21]

Answer:

Calcium would displace barium.

Explanation:

Ba(NO₃)₂ + Ca --> Ca(NO₃)₂ + Ba

There are two types of compounds: molecular/covalent and ionic.

Molecular/covalent compounds are non-metal + non-metal.

Ionic compounds are metal + non-metal.

Looking at the periodic table, barium is a metal. Calcium is also a metal.

Checking a polyatomic ions chart would tell you NO₃⁻ is a non-metal because it has a negative charge.

Since there is no metal + metal compound, the calcium metal would displace barium. The compound remains ionic.

7 0

2 years ago

How many gases are there that are not noble gases

natulia [17]

Answer:

Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Explanation:

I pretty much covered it in my answer!

Pls Brainliest! It would mean a lot! ;)

8 0

2 years ago

Suppose you are working with a NaOH stock solution but you need a solution with a lower concentration for your experiment. Calcu

Svet_ta [14]

Answer:

$V_1=23.3~mL$

Explanation:

In this case, we have a dilution problem. We have to remember that in the dilution procedure we go from a solution with higher concentration to a solution with lesser concentration. Therefore we have to start with the dilution equation:

$C_1*V_1=C_2*V_2$