Ask question

Ask question

All categories

3 years ago

14

Marco designs an experiment that will test whether a new plant food makes a grape vine produce more grapes. What is the independ

ent variable in his experiment?

1 answer:

padilas [110]3 years ago

6 0

The plant food. He's comparing the new plant food with his regular, or old, plant food.

You might be interested in

How many moles of glucose, C6H12O6, can be burned when 60.0 mol of oxygen is available? C6H12O6(s) + 6O2(g) → 6CO2(g) + 6H2O(l)

kiruha [24]

60mol O2 × 1 mol C6H12O6 / 6 moles 02 = 10 moles of Glucose

6 0

4 years ago

How many protons and neutrons does br-1 have

Anvisha [2.4K]

35 protons 35 electrons and 45 nutrons

5 0

4 years ago

N₂O(g) + 3 H₂(g) N₂H4(1) + H₂O(1) AH = -317 kJ/mol

docker41 [41]

Answer:

A

Explanation:

Recall that Δ<em>H</em> is the sum of the heats of formation of the products minus the heat of formation of the reactants multiplied by their respective coefficients. That is:

$\displaystyle \Delta H^\circ_{rxn} = \sum \Delta H^\circ_{f} \left(\text{Products}\right) - \sum \Delta H^\circ_{f} \left(\text{Reactants}\right)$

Therefore, from the chemical equation, we have that:

$\displaystyle \begin{aligned} (-317\text{ kJ/mol}) = \left[\Delta H^\circ_f \text{ N$_2$H$_4$} + \Delta H^\circ_f \text{ H$_2$O} \right] -\left[3 \Delta H^\circ_f \text{ H$_2$}+\Delta H^\circ_f \text{ N$_2$O}\right] \end{aligned}$

Remember that the heat of formation of pure elements (e.g. H₂) are zero. Substitute in known values and solve for hydrazine:

$\displaystyle \begin{aligned} (-317\text{ kJ/mol}) & = \left[ \Delta H^\circ _f \text{ N$_2$H$_4$} + (-285.8\text{ kJ/mol})\right] -\left[ 3(0) + (82.1\text{ kJ/mol})\right] \\ \\ \Delta H^\circ _f \text{ N$_2$H$_4$} & = (-317 + 285.8 + 82.1)\text{ kJ/mol} \\ \\ & = 50.9\text{ kJ/mol} \end{aligned}$

In conclusion, our answer is A.

5 0

3 years ago

Which of the following elements exists as a diatomic molecule? Argon, Hydrogen, Boron, Sulfur

Elis [28]

Diatomic molecules are the molecules that you can find them in natural bonded to itself. example: O₂, N₂ or Br₂.

the answer is hydrogen ---> H₂

I have attached a little trick to remember these.

5 0

4 years ago

What is the structure formula of c10h18

Alekssandra [29.7K]

Answer: <em>I'm not 100% sure this is the formula but I hope it still helps! :)</em>

<em />

Explanation:

Bornane; Cyclodecene; Decalin; Decynes. 1-Decyne; 2-Decyne; 3-Decyne; 4-Decyne; 5-Decyne, also known as dibutylethyne; Spirodecane

8 0

3 years ago