If an atom were the size of a baseball, its nucleus would be about the size of a(n) walnut. raisin. atom. flea.

Schach [20]

Answer: The correct option is option d

Explanation - The mean deal with science is that it allows people to carry on research in an organized manner to find or make new discoveries and inventions.

The basic purpose of science is to try new things or ways to get an outcome by constant perseverance on research and negating the ways that don't work thus giving and improving knowledge of what is correct and what is not to make a new Discovery or invention.

7 0

3 years ago

Read 2 more answers

Human bone does not contain?

tia_tia [17]

Human bone does not contain oxygen

4 0

4 years ago

The density of copper decreases as temperature increases (as does the density of most substances). Which change occurs in a samp

azamat

Answer: Option (c) is the correct answer.

Explanation:

As we know that density the amount of mass present in per unit volume.

Mathematically, Density = $\frac{mass}{volume}$

So, it means that density is inversely proportional to volume. Hence, when there will be decrease in density of a substance then there will be increase in its volume. That is, expansion of substance will take place.

Also, boiling point of copper is 2,562 degree celsius but we are heating it up to a temperature of 95 degree celsius. This means that copper will remain in liquid state at this temperature.

Thus, we can conclude that a change which occurs in a sample of copper is that copper sample will expand.

3 0

3 years ago

When CO(g) reacts with O2(g) according to the following reaction, 283 kJ of energy are evolved for each mole of CO(g) that react

marissa [1.9K]

Answer:

2CO + O₂ → 2CO₂ ΔH = -566 kj

Explanation:

Given data:

Energy evolved when 1 mole of CO react = 283 Kj

Energy evolved when 2 mole of CO react = ?

Solution:

Chemical equation:

2CO + O₂ → 2CO₂

It is given when one mole of CO react with oxygen 283 KJ energy is produced.

When 2 mole react,

2 ×-283 kj = -566 kj

Thermal equation:

2CO + O₂ → 2CO₂ ΔH = -566 kj

8 0

4 years ago

Hydrogen gas and nitrogen gas come together to form ammonia. If 25.0 g of nitrogen is mixed with hydrogen, what volume of hydrog

jeka94

Answer:

60.0L of hydrogen are needed

Explanation:

Based on the reaction:

3H₂ + N₂ ⇄ 2NH₃

3 moles of hydrogen react 1 mole of nitrogen.

To solve this question we have to find the moles of nitrogen. With the moles of nitrogen we can find the moles of hydrogen. Using PV = nRT at STP conditions we can find the volume as follows:

Moles Nitrogen -Molar mass: 28g/mol-

25.0g N₂ * (1mol / 28g) = 0.893 moles N₂

Moles hydrogen:

0.893 moles N₂ * (3mol H₂ / 1mol N₂) = 2.679 moles H₂

Volume hydrogen:

PV = nRT

V = nRT / P

Where V is volume in liters,

n are moles of the gas: 2.679 moles

R is gas constant: 0.082atmL/molK

T is absolute temperature: 273.15K at STP

P is 1atm at STP

Replacing:

V = 2.679mol*0.082atmL/molK*273.15K / 1atm

V =

<h3>60.0L of hydrogen are needed</h3>

6 0

3 years ago