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3 years ago

When light waves pass through solids, the speed of the wave ___________.

Chemistry

1 answer:

bearhunter [10]3 years ago

8 0

Answer:

i think that the answer is that it would decrease

Explanation:

hope this helps

sorry if the answer is wrong

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What type of bond holds nitrogen and sulfur together in a compound?

Natasha_Volkova [10]

Answer:

b covalent . A covalent bond holds atoms that share valence electrons

6 0

3 years ago

Can I please get help with this question ‍♂️?

guapka [62]

Answer:

1.50 moles of POH or Potassium Hydroxide.

Explanation:

First of all, find the substance formula

The substance formula of Potassium Hydroxide is

KOH

Second of all, if you want to convert from grams to moles, you use molar mass of KOH

Third of all, find the molar mass of KOH.

K = 39.1 amu

O = 16.0 amu

H= 1.0 amu

Potassium has 1 atom, oxygen has 1 atom, and hydrogen has 1 atom.

So do this:

39.1(1) + 16.0(1) + 1.0(1) = 56.1

The molar mass of KOH is 56.1 g/mol.

Fourth of all, use dimensional analysis to show your work.

84.20 grams of KOH * 1 mol/56.1 g/mol

The moles will cancel out.

84.20 divided by 56.1 = 1.500892166

But I have to round my answer to two digits after the decimal points instead of using sig figs.

So I round to the hundredths place

1.500892166 = 1.50

So the final answer is 1.50 moles(don't forget the units) of POH.

Hope it helped!

3 0

3 years ago

Is copper from periodic table matter or not.

ZanzabumX [31]

Answer:Copper is a chemical element with symbol Cu and atomic number 29. Classified as a transition metal, Copper is a solid at room temperature.So copper is a pure substance in any form (only copper atoms). ... A mixture of different kinds of metal atoms is called an "alloy" if they are mixed on an atomic scale.

8 0

3 years ago

Which letter (a-f) represents heat of reaction (∆HRxn) of the reverse reaction?

Elenna [48]

Answer:

Letter (f) represents the heat of reaction of both the reverse and the forward reaction.

Explanation:

The heat of a reaction, ∆Hrxn, is equal to the potential energy of the products less the potential energy of the reactants:

$\Delta H_{rxn}=\sum (\Delta H_{products})-\sum\Delta (H_{reactants})$

The forward reaction is the conversion of the substances, X and Y, which are represented on the left side of the graph, into the product Z, represented on the right side of the graph.

Thus, for the forward reaction, the change in enthalpy, or ΔH rxn, is the arrow labeled (f):

$\Delta H_{rxn}=\Delta H_{Z}-\Delta H_{X+Y}$

For the reverse reaction, the reactant is Z and the products are X and Y. Thus, heat of reaction for the reverse reaction is:

$\Delta H_{rxn}=\Delta H_{X+Y}-\Delta H_Z$

That is the same heat of reaction for the forward reaction with the sign changed: one is positive and the other is negative.

In this case, since the potential energy of Z (on the right side of the graph) is higher than the potential energy of X + Y (on the left side of the graph) the heat of reaction for the forward reaction is positive, the reaction absorbs energy, meaning that it is endothermic.

Therefore, the heat of reaction of the reverse reaction is negative, the reaction releases heat, and is exothermic.

Both heats of reaction are represented by the same arrow labeled (f).

4 0

4 years ago

What does the position of lithium (Li) on the periodic table tell you about its tendency to react with other elements?

Karolina [17]

For metals (lithium) reactivity increases down a group and from right to left across a period. So lithium is not that reactive. I think ‍♀️

5 0

3 years ago