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Greeley [361]
3 years ago
7

Prokaryotes store their DNA in a nucleus. True or false

Chemistry
2 answers:
Anarel [89]3 years ago
6 0
False is the answer!!
kirill [66]3 years ago
3 0
False, because prokaryotes do not have a nucleus.
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5) answer is A
Burka [1]

Answer:

A)  positive; added

Explanation:

Based on the reaction:

2NaHCO3(s) + 129kJ → Na2CO3(s) + H2(g) + CO2(g)

<em>2 moles of NaHCO3 requires 129kJ to produce 1 mole of Na2CO3, 1 mole of H2 and 1 mole of CO2.</em>

<em />

That means, the energy must be added being, thus, an exothermic reaction. The exothermic reactions have ΔH >0.

Thus, right answer is:

A)  positive; added

3 0
2 years ago
A volume of 125 mL of H2O is initially at room temperature (22.00 ∘C). A chilled steel rod at 2.00 ∘C is placed in the water. If
VMariaS [17]

Answer:

41.9 g

Explanation:

We can calculate the heat released by the water and the heat absorbed by the steel rod using the following expression.

Q = c × m × ΔT

where,

c: specific heat capacity

m: mass

ΔT: change in temperature

If we consider the density of water is 1.00 g/mol, the mass of water is 125 g.

According to the law of conservation of energy, the sum of the heat released by the water (Qw) and the heat absorbed by the steel (Qs) is zero.

Qw + Qs = 0

Qw = -Qs

cw × mw × ΔTw = -cs × ms × ΔTs

(4.18 J/g.°C) × 125 g × (21.30°C-22.00°C) = -(0.452J/g.°C) × ms × (21.30°C-2.00°C)

ms = 41.9 g

3 0
3 years ago
Someone help me please, I will give you brainliest
Nikitich [7]

Answer:

conserve mass.

Explanation:

3 0
3 years ago
What is a cation and where can you find it on the periodic table?
LUCKY_DIMON [66]

Answer: Cations are positively charged ions.

Explanation: In cations the number of electrons is not equal to the number of positively charged protons. This is due to reason that cations donates their outer valence electrons making the atom less electronegative. The amount of electrons donated indicates the charge of the cation.

6 0
3 years ago
Cuales son los reactivos y los productos del enlace peptidico?
Hoochie [10]

Answer:

this isnt english

Explanation:

4 0
3 years ago
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