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Paul [167]
3 years ago
8

HELP WHOEVER ANSWERS WILL BE MARKED BRAINLIEST

Chemistry
1 answer:
Vika [28.1K]3 years ago
7 0
1) T
2) F- the heart pumps blood
3) T
4) F- atria and ventricles
5) T
6) T
7) T
8) T
9) F- your heart rate goes down but doesn't stop
10) T

1) D
2) B
3) A
4) E
5)C
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How many miles are in 68 grams of copper 2 hydroxide, Cu (OH)2
BabaBlast [244]
Molar mass  Cu(OH)₂ =  <span>97.561 g/mol

1 mol --------- 97.561 g
? mol ---------- 68 g

moles = 68 * 1 / 97.561

moles = 68 / 97.561

= 0.6969 moles 

hope this helps!</span>
8 0
4 years ago
a muscle fiber contracts when myosin filaments pull actin filaments closer together and thus shorten sarcomeres within a fiber.
kakasveta [241]

Answer:According to the sliding filament theory, a muscle fiber contracts when myosin filaments pull actin filaments closer together and thus shorten sarcomeres within a fiber.

Explanation:

No need for an explanation if i just answered it

7 0
3 years ago
The molar mass of a certain gas is 49 g. What is the density of the gas in g/L at STP?
snow_tiger [21]

Answer:

\boxed{\text{2.2 g/L}}

Explanation:

We can use the Ideal Gas Law to calculate the density of the gas.

   pV = nRT

      n = m/M           Substitute for n

   pV = (m/M)RT     Multiply both sides by M

pVM = mRT            Divide both sides by V

  pM = (m/V) RT

     ρ = m/V             Substitute for m/V

 pM = ρRT              Divide each side by RT

\rho = \frac{pM }{RT}

Data:

p = 1.00 bar

M = 49 g/mol

R = 0.083 14 bar·L·K⁻¹mol⁻¹

T = 0 °C = 273.15 K

Calculation:

ρ = (1.00 × 49)/(0.083 14 × 273.15) = 2.2 g/L

The density of the gas is \boxed{\text{2.2 g/L}}.

8 0
4 years ago
Read the list of elements given below.
PtichkaEL [24]

Answer:

b All of them are highly reactive nonmetals

3 0
3 years ago
Multiple Choice. For each statement, circle the correct answer.
kumpel [21]
Tataattatataaggagahahah( to answer it)



9. A
10. C
4 0
3 years ago
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