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svet-max [94.6K]

3 years ago

13

Since children of the first union/marriage have the trait the great- grandparents do not have the trait they must have been carr

iers.
a. true
b. false

2 answers:

Marrrta [24]3 years ago

8 0

False, sorry if I’m wrong.

stira [4]3 years ago

6 0

Answer:

a.true

Explanation:

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An element crystallizes in a face-centered cubic lattice. If the length of an edge of the unit cell is 0.408 nm, and the density

V125BC [204]

Answer:

Au

Explanation:

For the density of a face-centered cubic:

$Density = \dfrac{4 \times M_w}{N_A \times a^3}$

where

$M_w$ = molar mass of the compound

$N_A=$ avogadro's constant

$a^3 =$ the volume of a unit cell

Given that:

Density $(\rho)$ = 19.30 g/cm³

a = 0.408 nm

a = $0.408 \times 10^{-9} \times 10^{2} \ cm$

a = $4.08 \times 10^ {-8} \ cm$

∴

$19.3 = \dfrac{4 \times M_w}{(6.023 \tmes 10^{23})\times (4.08 \times 10^{-8})^3}$

$M_w= \dfrac{19.3\times (6.023 \times 10^{23})\times (4.08 \times 10^{-8})^3}{4}$

$M_w=197.37 \ g/mol$

Thus, the molar mass of 197.37 g/mol element is Gold (Au).

4 0

3 years ago

If a chemical appears on the periodic table, it is a(n), ____________

Andre45 [30]

0 plus 5 negative and accumulated

7 0

3 years ago

If this is a p1000 micropipette, then this is set to dispense [ Select]ul. If this is a p10

mariarad [96]

Answer:

1000 µL; 10 µL

Explanation:

A p1000 micropipet is set to dispense 1000 µL.

A p10 micropipet set to dispense 10 µL.

3 0

4 years ago

The two gases, H2 and O2, were allowed to effuse under the same conditions through a pinhole. If the rate of effusion of O2 was

TEA [102]

The rate of effusion of H₂ : 7.2 x 10⁻² m/s

<h3>Further explanation </h3>

Graham's law: the rate of effusion of a gas is inversely proportional to the square root of its molar masses or

the effusion rates of two gases = the square root of the inverse of their molar masses:

$\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }$

or

$\rm M_1\times r_1^2=M_2\times r_2^2$

MW₁ O₂ = 32 g/mol

MW₂ H₂ = 2 g/mol

$\tt \dfrac{1.8\times 10^{-2}}{r_2}=\sqrt{\dfrac{2}{32} }\\\\\dfrac{(1.8\times 10^{-2})^2}{r_2^2}=\dfrac{2}{32}\\\\r_2=0.072=7.2\times 10^{-2}~m/s$

7 0

3 years ago

Rotting food is an example of a chemical reaction. Many foods will not quickly less kept in a refrigerator. From this

pantera1 [17]

Answer:

A. Increasing the temperature of a chemical reaction speeds up the reaction rate.

Explanation:

The higher the temperature is, the faster a chemical reaction will happen. Food rots slower in refrigerators because it is cold, outside, they rot faster.

6 0

3 years ago