Describe the differences in the atomic structures of a hydrogen atom and a helium atom.I need a paragraph for my homework, would help a lot! thanks : )

Answers

Answer 1

Answer:

A hydrogen atom has one proton and one electron. The helium atom has 2 protons, 2 electrons and 2 neutrons.

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What type of igneous rock is cooled and solidified above ground?

Answers

Hi, I think the rocks that are cooled and solidified above ground are most commonly basalt.

Hope I helped a bit!

It is totally not batholith, It is written in the section that it is Extrusive.

What types of atoms are shown in a skeletal model of an organic molecule?A. Atoms of every element except carbon
B. Atoms of every element except hydrogen
C. Atoms of every element
D. Atoms of every element except carbon and hydrogen

Answers

Answer:

Atoms of every element are shown in a skeletal model of an organic molecule.

Explanation:

Skeletal model of an organic molecule consists of various skeletal atoms that are used in making up of the molecule. Various conventions of hydrogen and carbon atoms are employed in it. The molecules bonding and certain representation of molecular geometry are shown in the structural formula.

Use of skeletal formula is ubiquitous in organic chemistry. Thus, in organic chemistry atoms of every element are shown in the skeletal model of an organic molecule

Read the following graduated cylinder.

47 mL
47.2 mL
47.25 mL

Answers

Answer:

47 mL

Explanation:

By the image, the beaker graduation will from 45 from 50 mL, passing by 5 markings. So each mark has 1 mL. To read the volume, we have see the meniscus, which is the concave superficie of the liquid. The meniscus is above the second mark, so it passed 2 mL from the 45 line, the volume is 47 mL.

47.2 mL is the correct answer

Suppose 300 mL of 0.50 M lithium bromide solution and 300 mL of 0.70 M rubidium bromide solution are combined. What is the concentration of the bromide ion in the resulting solution?

Answers

Answer:

0.60 mol·L⁻¹

Explanation:

Data:

LiBr: c = 0.50 mol/L; V =300 mL

RbBr: c = 0.70 mol/L; V =300 mL

1. Calculate the moles of Br⁻ in each solution

(a) LiBr

$\text{Moles} = \text{0.300 L} * \frac{\text{0.50 mol}}{\text{1 L}} = \text{ 0.150 mol}$

(b) RbBr

$\text{Moles} = \text{0.300 L} * \frac{\text{0.70 mol}}{\text{1 L}} = \text{ 0.210 mol}$

2. Calculate the molar concentration of Br⁻

(a) Moles of Br⁻

n = 0.150 mol + 0.210 mol = 0.360 mol

(b) Volume of solution

V = 300 mL + 300 mL = 600 mL = 0.600 L

(c) Molar concentration

$c = \frac{\text{moles}}{\text{litres}} = \frac{\text{0.360 mol}}{\text{0.600 L}} = \textbf{0.60 mol/L}$

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

The addition of LiBr and RbBr has been dissociated into the equal moles of Li, Rb, and Br.

$\rm LiBr\;\rightarrow\;Li^+\;+\;Br^-$

$\rm RbBr\;\rightarrow\;Rb^+\;+\;Br^-$

Thus 1 mole of LiBr = 1 mole Br

1 mole RbBr = 1 mole Br.

The moles of LiBr in 0.5 M solution:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

0.5 = $\rm moles\;*\;(1000)/(300\;ml)$

Moles of LiBr = 0.15 mol

The moles of Br from LiBr = 0.15 mol.

The moles of RbBr in 0.7 M solution:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

0.7 = $\rm moles\;*\;(1000)/(300\;ml)$

Moles of RbBr = 0.21 mol

The moles of Br from RbBr = 0.21 mol.

The total moles of Br ions from LiBr and RbBr has been :

= 0.15 + 0.21

= 0.36 mol.

The total volume of the solution will be:

= 300 + 300 ml

= 600 ml.

The concentration of the Br ion has been:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

Molarity of Br ions = $\rm 0.36\;*\;(1000)/(600\;ml)$

Molarity of Br ions = 0.6 M.

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

For more information about the concentration of the sample, refer to the link:

brainly.com/question/11804141

Which of these pairs is in Kingdom Fungi?A.
mushrooms and bacteria

B.
diatoms and water molds

C.
mushrooms and yeast

D.
protist and virus

and

Many organisms in Kingdom Fungi grow best in warm, moist conditions. Which of the following is also a characteristic common to organisms in Kingdom Fungi?

A.
reproduce through spores

B.
single celled

C.
survive without oxygen

D.
make nutrients through photosynthesis

Answers

Q: Which of these pairs is in Kingdom Fungi?
A: C. Mushrooms and Yeast

Q: Many organisms in Kingdom Fungi grow best in warm, moist conditions. Which of the following is also a characteristic common to organisms in Kingdom Fungi?
A: A. reproduce through spores

number one is C.mushrooms and yeast and the second one is
A.reproduce through spores.hope it helps.

What effect does an atibiotic have on an infection like strep throat ?

Answers

Keeps infection from spreading

I think that it kills the virus

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