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2 years ago

7

You have two solid substances that look the same. What measurements would you take and which tests would you preform to determin

e whether they actually are the same?

1 answer:

ASHA 777 [7]2 years ago

5 0

Answer:

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4. A salvage operator recovered coins believed to be gold. A sample weighed 385.000g and has a volume of 20.0mL. Were the coins

aleksley [76]

Answer:

Gold

Explanation:

We are given that

Mass of sample ,m=385 g

Volume ,V=20mL

We have to find the coin is gold or yellow brass.

We know that

Density= $\frac{Mass}{volume}$

Using the formula

$Density=\frac{385}{20}g/mL$

$Density=19.25g/mL$

$Density\approx 19.3g/mL$

Density of coin=19.3g/mL

Density of gold=19.3g/mL

Hence, the coin is gold.

5 0

2 years ago

Your calculated density of aluminum is d = 2.69 g/cm3. Aluminum’s accepted density is 2.70 g/cm3. Without writing the "%" sign,

stepan [7]

Answer:

0.37 %

Explanation:

Given that:

Calculated density of aluminum = 2.69 g/cm³

Accepted density of aluminum = 2.70 g/cm³

$Error\ percentage=\frac {|Accepted\ value-Calculated\ value|}{Accepted\ value}\times 100$

Thus, applying values as:

$Error\ percentage=\frac {|2.70-2.69|}{2.70}\times 100$

<u>Percent error = 0.37 %</u>

7 0

3 years ago

Read 2 more answers

Please help...<br> CaS cation and anion<br> ZnCl2 cation and anion<br> Cu2CrO4 cation and anion

Anvisha [2.4K]

Answer:Ionic compounds form when positive and negative ions share electrons and form an ionic bond. ... The positive ion, called a cation, is listed first in an ionic compound formula, followed by the negative ion, called an anion. A balanced formula has a neutral electrical charge or net charge of zero.

Explanation:Simple ions:

Perchlorate ClO4- IO3-

Chlorate ClO3- BrO3-

Chlorite ClO2-

Hypochlorite OCl- OBr-

7 0

2 years ago

Given the equation I = Q/t, solve for t.

larisa86 [58]

Answer: $t=\frac{Q}{I}$

Explanation:

$I=\frac{Q}{t}$

Multiply by t on both sides.

$t*I=\frac{Q}{t}*t$

$tI=Q$

Now divide by I to isolate t.

$\frac{tI}{I}=\frac{Q}{I}$

$t=\frac{Q}{I}$

5 0

3 years ago

Mashcka [7]

Answer:

It is 34

Explanation:

4 0

2 years ago