Question

Science study guide help :)

Answer 1

Hydrogen fuel cells that operate at lower temperatures use more expensive platinum electrode catalysts.

What helps to make up for the higher-cost electrodes?
They use a cheaper fuel.
They operate at a higher efficiency.
They use a reaction that is not redox.
They produce fewer emissions.

Answer 2

I need the name of this but i cant find it online 2na+2h2o=2naoh+h2

Answer 3

i need the chemical name

Answer 4

I think its Sodium + water = sodium hydroxide and hydrogen gas

Answer 5

but im not sure

Answer 6

that sounds right to me

Answer 7

The diagram shows two charged objects, A and B.


Based on the field lines, what are the charges of the objects?

A: positive
B: negative
A: negative
B: positive
A: negative
B: negative
A: positive
B: positive

Answer 8

An unbalanced chemical equation for the reaction of boron fluoride with lithium sulfite is shown below.

BF3 + Li2SO3 ---> B2(SO3)3 + LiF

What is the coefficient of lithium fluoride in the balanced chemical reaction?

Answer 9

1
3
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6