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Grace [21]
4 years ago
9

Give the formulas for the ionic compounds made of the following ions:

Chemistry
1 answer:
mezya [45]4 years ago
5 0
ScBr3, K2O, CaI2, Cr2S3, RbF, MgO, K3N, SrF2, and Al2S3. The only thing you need to do is to ensure every ionic compound has a total valence of zero. Four the last four, you need to know usually valence of these ions.
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A 0.25 M solution of NaCl must be diluted into a 250 mL solution (0.08 M). What volume should be taken from the original solutio
mihalych1998 [28]

Answer:

80ml

Explanation:

you have your initial concentration to be 0.25 mole on your final volume to be 250 ml and your final concentration to be 0.8 0.08 molar you don't have your initial volume sotify your initial volume you use the expression see 1 * 21 equals see two times between you make when when the subject then 1 equals to 2 x 2/3 one you know substitute your values into it to get being one that's your original volume to be at the latest or 80 ml

7 0
4 years ago
Reasons for taking the melting point of a solid sample
Rudik [331]

Definition of melting point:

The melting point of solid is defined as the temperature at which the solid exists in equilibrium with its liquid under an external pressure of one atmosphere.

Reason:

The melting point is an important physical property of a compound.

1) The melting point can be used to identify a substance.

2) As an indication of its purity.

5 0
4 years ago
2. Which types of changes observe the law of
mart [117]
D) physical and chemical changes
3 0
3 years ago
You are given 600 grams of sodium chloride (NaCl), but you are planning to purify the substance and extract just the sodium. How
Eddi Din [679]

Answer:

236.02 grams of Na is produced by 600g of NaCl.

Explanation:

NaCl --> Na+Cl-

to find the number of moles NaCl has, divide the grams over the molar mass which is 600/58.44

number of moles of nacl= 10.2 moles

then turn moles back to grams which is moles x molar mass

10.2 moles x 22.9 mass

= 236.02 grams

4 0
3 years ago
The center of hemoglobin is made of which of the following?
sveticcg [70]
<span>The center of hemoglobin is made of which of the following?

</span><span>amino acids</span>
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