3 years ago

Hydrogen is an element. True False

Chemistry

2 answers:

padilas [110]3 years ago

7 0

Answer:

True

Explanation:

Hydrogen is one of the most abundant elements in the universe so yes

mixas84 [53]3 years ago

7 0

Answer:

true

Explanation:

Hydrogen is an chemical element

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What is the mass of 3.75 moles of NaCl

sasho [114]

M (NaCl) = n × M = 3.75 × 58.5 =
219.375 g

M (NaCl) = 23 + 35.5 = 58.5 g/mol

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3 years ago

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The activation energy for a reaction is the energy difference between what two components of a reaction?

lora16 [44]

Answer:

Activation Energy is the Energy that Must be Overcome/reached by Reactants for Products to be formed.

I'd go with the 2nd Option.

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3 years ago

Calculate ΔH for the reaction: C(graphite) + 2H 2(g) + 1/2 O 2(g) => CH 3OH(l) Using the following information: C(graphite) +

Alika [10]

Answer:

$\Delta H$ for the given reaction is -238.7 kJ

Explanation:

The given reaction can be written as summation of three elementary steps such as:

$C(graphite)+O_{2}(g)\rightarrow CO_{2}(g)$ $\Delta H_{1}= -393.5 kJ$

$2H_{2}(g)+O_{2}(g)\rightarrow 2H_{2}O(l)$ $\Delta H_{2}= (2\times -285.8)kJ$

$CO_{2}(g)+2H_{2}O(l)\rightarrow CH_{3}OH(l)+\frac{3}{2}O_{2}(g)$ $\Delta H_{3}= 726.4 kJ$

---------------------------------------------------------------------------------------------------

$C(graphite)+2H_{2}(g)+\frac{1}{2}O_{2}(g)\rightarrow CH_{3}OH(l)$

$\Delta H=\Delta H_{1}+\Delta H_{2}+\Delta H_{3}=-238.7 kJ$

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4 years ago

Anti-acids contain ingredients, such as aluminium hydroxide and magnesium hydroxide. Anti-acids can provide almost instant relie

Marrrta [24]

Answer:

help

Explanation:

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