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3 years ago

Which of the following is one principle of the cell theory?

2 answers:

6 0

The answer you are looking for is C
Both plants and animals are made of cells
And all living things are made up of one or more cells. I hope that helped! :)

mario62 [17]3 years ago

3 0

Answer:

One principle of the cell theory is that living things are made up of one or more cells.

Explanation:

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Help please thanks you

scoundrel [369]

Explanation:

Ok so water is H2O and cabon dioxide in the air is CO2, so the water goes through the carbon dioxide and makes acid rain H2SO4.

Now we have our limestone which is CaCO3.

What happens is that the acid breaks apart our limestone into Ca2+ and CO3 2-. This then reforms into Calcium bicarbonate Ca(CO3)2.

Calcium bicarbonate is soluble in water and is hence washed away by the rain eroding the limestone.

5 0

3 years ago

What structural features help us identify a compound as an alkane, a cycloalkane, an alkene, an alkyne, a saturated hydrocarbon

elena55 [62]

1. Cycloalkane
2. Alkene
3. Saturated Hydrocarbon
4. Aromatic Hydrocarbon
5. Alkane
6. Alkyne

5 0

3 years ago

A zinc block with a mass of 230 g is given 1320 J of energy. What is the change in

Mariana [72]

Answer:

14.7°C

Explanation:

Q = m·ΔT·c

ΔT = $\frac{Q}{m*c}$

ΔT = $\frac{1320 J}{230 g* 0.39 J/gC}$

= 1320 J / ((230 g) * (.39 J/g°C)

ΔT = 14.7 °C

4 0

3 years ago

A bar of copper has a mass of 216g and a volume of 24cm^3. What is the density of copper?

7nadin3 [17]

Answer:

<h2>The answer is 9 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 216 g

volume = 24 cm³

The density is

$density = \frac{216}{24} \\$

We have the final answer as

Hope this helps you

3 0

3 years ago

For the reaction MgSO3(s) → MgO(s) + SO2(g), which is spontaneous only at high temperatures, one would predict thata. ΔH˚ is neg

Nataliya [291]

Answer: c. ΔH˚ is positive and ΔS˚ is positive

Explanation:

According to Gibb's equation:

$\Delta G=\Delta H-T\Delta S$

$\Delta G$ = Gibbs free energy

$\Delta H$ = enthalpy change

$\Delta S$ = entropy change

T = temperature in Kelvin

$\Delta G$ = +ve, reaction is non spontaneous

$\Delta G$ = -ve, reaction is spontaneous

$\Delta G$ = 0, reaction is in equilibrium

Thus for $\Delta G=-ve$

Case :

$T\Delta S$ > $\Delta H$

when $\Delta S\text{ and }\Delta H$ both have positive values.

$\Delta G=(+ve)-T(+ve)$

$\Delta G=(+ve)(-ve)=-ve$

Reaction is spontaneous only at at high temperatures.

8 0

3 years ago