All categories

4 years ago

Vascular plants can be divided into three categories. These categories are

1 answer:

3 0

They also have a specialized non-lignified tissue (the phloem) to conduct products of photosynthesis. Vascular plants include the clubmosses, horsetails, ferns,gymnosperms (including conifers) and angiosperms (flowering plants). Scientific names for the group include Tracheophyta and Tracheobionta.

You might be interested in

Describe at least 10 things you did this week to be part of the solution. Describe the areas you see you need to improve in.

RSB [31]

So what did you do this week?

7 0

3 years ago

20 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Amanda [17]

The KE can be solve using the formula:
ke = 0.5 mv^2
where m is the mass of the object
v is the velocity
ke = 0.5 ( 2 kg ) ( 5 m/s)^2
ke = 25 J

the GPE can be solved using the formula:
GPE = mgh
where m is the mass
g is the acceleration due to gravity ( 9.81 m/s^2)
h is the height

GPE = ( 4 kg)(9.81 m/s^2)( 40 m)
GPE = 392.4 J

4 0

3 years ago

Calculate ΔHrxn for the following reaction: Fe₂O₃(s)+3CO(g)→2Fe(s)+3CO₂(g) Use the following reactions and given ΔH′s. 2Fe(s)+3/

ExtremeBDS [4]

Answer : The enthalpy change of reaction is -23.9 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

$Fe_2O_3(s)+3CO(g)\rightarrow 2Fe(s)+3CO_2(g)$ $\Delta H=?$

The intermediate balanced chemical reaction will be,

(1) $2Fe(s)+\frac{3}{2}O_2(g)\rightarrow Fe_2O_3(s)$ $\Delta H^o_1=-824.2kJ$

(2) $CO(g)+\frac{1}{2}O_2(g)\rightarrow CO_2(g)$ $\Delta H^o_2=-282.7kJ$

First we will reverse the reaction 1 and multiply equation 2 by 3 then adding both the equation, we get :

(1) $Fe_2O_3(s)\rightarrow 2Fe(s)+\frac{3}{2}O_2(g)$ $\Delta H^o_1=+824.2kJ$

(2) $3CO(g)+\frac{3}{2}O_2(g)\rightarrow 3CO_2(g)$ $\Delta H^o_2=3\times (-282.7kJ)=-848.1kJ$

The expression for final enthalpy is,

$\Delta H=\Delta H^o_1+\Delta H^o_2$

$\Delta H=(+824.2kJ)+(-848.1kJ)$

$\Delta H=-23.9kJ$

Therefore, the enthalpy change of reaction is -23.9 kJ

7 0

3 years ago

The small shock you feel when you rub your shoes on carpet and touch something metal is caused by___. A. conduction B. insulator

Reptile [31]

I think it's conduction.

7 0

3 years ago

Read 2 more answers

a unit of heredity responsible for determining some characteristics which is transferred from a parent to offspring

Ludmilka [50]

Answer:

aռsաɛʀ: ɢɛռɛs aʀɛ tɦɛ ʊռɨts օʄ ɦɛʀɛɖɨtʏ aռɖ aʀɛ tɦɛ ɨռstʀʊċtɨօռs tɦat ʍaҡɛ ʊք tɦɛ ɮօɖʏ's ɮʟʊɛքʀɨռt. tɦɛʏ ċօɖɛ ʄօʀ tɦɛ քʀօtɛɨռs tɦat ɖɛtɛʀʍɨռɛ ʋɨʀtʊaʟʟʏ aʟʟ օʄ a քɛʀsօռ's ċɦaʀaċtɛʀɨstɨċs. ɦʊʍaռs ɦaʋɛ aռ ɛstɨʍatɛɖ 35,000 ɢɛռɛs.

ċօʀʀɛċt ʍɛ ɨʄ ɨʍ աʀօռɢ (-_^)

3 0

2 years ago