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3 years ago

Question 1

Chemistry

1 answer:

Ronch [10]3 years ago

4 0

Answer:

Isotopes

Explanation:

iso means the same like in triangles (isosceles) so the atoms are the same element but different in mass. Since the isotopes have the same number of protons and electrons the isotopes have much the same chemical behavior. Since the isotopes have different numbers of neutrons the nuclear behavior differs.

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A 4.5 M solution is to be diluted to 750.0 mL of a 1.5 M solution. How many mL of the 4.500 M solution are required?

maw [93]

Answer:

309

Explanation:

7 0

2 years ago

Please help! ill give you 90 points!

Luba_88 [7]

Answer:

1.d = 2.70 g/mL

2.d = 13.6 g/mL

4.d = 1896 g / 212.52 cm3 = 8.9 g/cm3

Explanation:If this helped subscribe to Amiredagoat Yt

3 0

3 years ago

A chemist must prepare 575.mL of 1.00M aqueous sodium carbonate Na2CO3 working solution. He'll do this by pouring out some 1.58M

igor_vitrenko [27]

Answer : The volume in mL of the sodium carbonate stock solution is 364 mL.

Explanation :

According to dilution law:

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of aqueous sodium carbonate

$M_2$ = molarity of aqueous sodium carbonate stock solution

$V_1$ = volume of aqueous sodium carbonate

$V_2$ = volume of aqueous sodium carbonate stock solution

Given:

$M_1$ = 1.00 M

$M_2$ = 1.58 M

$V_1$ = 575 mL

$V_2$ = ?

Now put all the given values in the above formula, we get:

$1.00M\times 575mL=1.58M\times V_2$

$V_2=363.92mL\approx 364mL$

Therefore, the volume in mL of the sodium carbonate stock solution is 364 mL.

8 0

2 years ago

A certain metal hydroxide, m(oh)2, contains 32.8% oxygen by mass. what is the identity of the metal m? enter the full name of th

elena-14-01-66 [18.8K]

Let the atomic mass of M metal be X.

The formula mass of metal hydroxide, $M(OH)_2$ = $X+2\times 1+2\times 16 = (X+34) g/mol$

Mass percentage of oxygen in metal hydroxide, $M(OH)_2$ = 32.8%

Mass percentage is given as:

$\frac{mass of element}{total mass of compound}\times 100$

Substituting the values:

$\frac{2\times 16}{Y+34} = 32.8$ %

$\frac{2\times 16}{Y+34} = 0.328$

${32} = 0.328\times ({Y+34})$

$32 = 0.328Y+11.152$

$0.328Y = 20.848$

$Y = \frac{20.848}{0.328} = 63.56$

The element having atomic mass $63.56 u$ is copper, $Cu$ .

Hence, In metal hydroxide, $M(OH_2)$ the metal M is copper, $Cu$ . Formula of oxide is $Cu(OH)_2$ .

3 0

3 years ago

Read 2 more answers

In mice black fur is dominant and white fur is recessive. State the fur colour a mouse would have with the following allele comb

sweet [91]

Answer:

easy peasy lemon squeasy

Explanation:

black fur is dominant, these traits show there characteristics in the homogeneous as well as in the heterogeneous pair,

and the other, white fur is recessive, which is the total opposite if the one mentioned before, but will show only in homogeneous pair

then, A. BB - both dominant alleles, hence will show black color,

B. bb - both recessive alleles, hence will show white color

C. Bb - a heterogeneous pair, hence the dominant allele will show its characteristics, that is, black

tada!!!!

7 0

3 years ago