1. Compare atoms, molecules, compounds.

Answer:

[tex]workdone = weight \: \times \: distance \\ = 25 \times 40 \\ = 1000 \: lbsft \\ or \\ = 1000 \: joules[/tex]

Answer:

The further away the centre of mass is from the wall, the more friction force is required at the hands. The more weight is shifted from the hands to the feet, the smaller is the friction force at the hands and the closer is the climber to the point of impending slippage.

Answer: ITSSSS TRUE!!!!!

Explanation:

Answer:

hmm I would say microwave

Answer:

The statement about human activity and the environment that is NOT true is:

A. Humans knowingly create environmental disasters.

An environmental disaster is usually understood as an irreversible change in the natural complex, which can lead to the death of living beings. It states that these can be even the smallest species of organisms.

Examples of environmental disasters include wildfires, landslides, floods, earthquakes, droughts, tornadoes, tsunamis, and volcanic eruptions.

Thus, option A is correct.

Find more information about environmental disasters here:

brainly.com/question/26342911

Answer:

solid Bronze metal

Explanation:

Ap3x verified

Answer:

b

Explanation:

a p e x

The average speed of the toy car : 0.2 m/s

Given

The motion of a toy car

Required

The average speed

Solution

Average speed = total distance/total amount of time ,

From the graph :

Total distance travelled : 4

Total time : 20 s

The average speed = total distance (d) : total time (s)

The avg speed = 4 : 20

The avg speed = 0.2 m/s

Explanation:

When water is heated up then its molecules move rapidly from one place to another. Hence, kinetic energy of the molecules tend to increase.

Also,   K.E = [tex]\frac{3}{2}kT[/tex]

where, T = temperature

Therefore, more is the increase in temperature more will be the mean molecular speed change in the water molecules.

As a result, mean molecular speed change increases with increase in temperature and vice-versa.

Answer:

D

Explanation:

because it has two or more properties

.........................

Q6

a) HCl dipole-dipole --> higher

I2 london dispersion

b) CH3F H-bonding --> higher ( higher Molecular mass)

CH3OH H-bonding

c) H2O H-bonding --> higher

H2S dipole-dipole

d) SiO2 dipole-dipole --> higher (the difference is higher in the electronegativity )

SO2 dipole-dipole

e) CH3OH H-bonding

CuO ionic-dipole --> higher because it is ionic compound

f) NH3 H-bonding (higher)

CH4 london dispersion

g) HCl dipole-dipole

NaCl ionic dipole--> HIGHER ionic compound

h) SiC london dispersion

Copper metallic bond --> higher

Answer:

The radius of an atom can only be found by measuring the distance between the nuclei of two touching atoms, and then halving that distance. The type of atomic radius being measured here is called the metallic radius or the covalent radius depending on the bonding.

Explanation:

(Pls mark me brainliest if you can)

Answer: Salts

Explanation: Salts easily dissolve in water. Salts are always ionic bonds, meaning they dissolve easily.

Ice does not technically dissolve in water since ice is made of water. You can't dissolve a substance in itself.

Metals are obviously not able to dissolve either in water.

Oils do not mix with water, they float on water, meaning they are immiscible.

Answer:

8

Explanation:

i dunno i think its right tho

Explanation:

When the gymnast is standing straight up, gravity acts on the gymnast but the gymnast is able to stay relatively stable.Tihis happens because her center of mass is directly above the beam which means that gravity is pushing her down onto the beam.

Answer:

yes

Explanation:

The cell theory states that all biological organisms are composed of cells; cells are the unit of life and all life come from preexisting life. The cell theory is so established today that it forms one of the unifying principles of biology.

0.024 kg CaO

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Aqueous Solutions

Atomic Structure

Step 1: Define

0.41 mol CaO

2.5 M Solution

Step 2: Identify Conversions

1000 g = 1 kg

Molar Mass of Ca - 40.08 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of CaO - 40.08 + 16.00 = 56.08 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs as our lowest.

0.024114 kg CaO ≈ 0.024 kg CaO

Answer:

0.172 Kg

Explanation:

Given data:

Kg of solvent = ?

Moles of solute = 0.43 mol

Molality = 2.5 m

Solution:

Formula:

m = moles / Kg of solvent

by putting values,

2.5 m = 0.43 mol / kg of solvent

Kg of solvent = 0.43 mol / 2.5 m

Kg of solvent = 0.172 Kg

In this qn, you use the mole formula,

amount (mol) = mass (g) ÷ molar mass

(molar mass is the mass number of an element, which u can find by referring to the periodic table)

so by subbing in the values given to you, you can find the answer

5. amount of Cu = 55.9 ÷ 63.5 = 0.880mol (3sf)

6. amount of N2 = 340 ÷ 2(14.0) = 12.1mol (3sf)

(note: you multiply the molar mass of N by 2 as there are 2 N atoms)

for qn 7 and 8, youre finding the mass and not the amount. By bringing the molar mass over to the other side of the formula, you get

mass = amount (mol) × molar mass

thus,

7. mass of Fe = 0.063 × 55.8 = 3.52g (3sf)

8. mass of H2 = 94.7 × 2(1.0) = 47.4g (3sf)

extra things to take note of:

- likewise, you can also find the molar mass of an element by using

molar mass = mass(g) ÷ amount(mol)

^^ this is commonly only needed when you need to find the molar mass of an isotope. the question will give you the amount and mass of the element, and you just need to factor them in to find your answer.

- typically, you use 3 sf in your final answer and 5sf in your working. remember to write (3sf) at the end of your number statement when necessary.

- when you get an answer of (eg.) 0.6mol, you still need to write it in 3sf, so your answer would be 0.600mol

Answer:

Kg

Explanation:

Answer:

Kilograms(SI unit for mass) 10^3

Explanation:

P₂O₅ is an empirical formula

Given

compounds

Required

an empirical formula

Solution

The empirical formula is the smallest comparison of the atoms forming the compound.

Molecular formulas are formulas that show the number of atomic elements that make up a compound.

(empirical formula) n = molecular formula

1. P₂O₅ : the ratio of compounds cannot be further reduced to whole numbers⇒empirical formula

2. P₄O₆ : molecular formula

(P₂O₃)₂=P₄O₆

P₂O₃ : empirical formula

3.C₂H₄ : molecular formula

(CH₂)₂=C₂H₄

CH₂ : empirical formula

4. C₃H₆ : molecular formula

(CH₂)₃=C₃H₆

CH₂ : empirical formula

Answer:

P₂O₅

Explanation:

Answer:

0.02740 moles ZnCl2

0.8777 moles ZnCl2

Explanation:

a) How many moles of ZnCl, can be made from 1.7g of Zn?

First we need to convert from grams of Zn to moles of Zn, and then from moles of Zn to moles of ZnCl.

We will use the atomic weight of Zn to do this..

Atomic weight is 65.38 g Zn/1 mol Zn, this can also be written as

1 mol Zn/65.38mol Zn... We will now convert:

1.76 g Zn *  [tex]\frac{1 mol Zn}{65.38 g Zn}[/tex] = 0.0273784032 moles Zn

Now we'll use the balanced chemical equation to convert from moles of Zn to moles of ZnCl..

Zn + 2HCl -> ZnCl2 + H2

We can see that for every mol of Zn that reacts, 1 mol of ZnCl2 is produced..

So:

0.0273784032 moles Zn * [tex]\frac{1 mol ZnCl2}{1 mol Zn}[/tex] = 0.0273784032 moles ZnCl2

This can be estimated to 0.0274 moles ZnCl2

__________________________________________________________

b) If 6.4 grams of HCl are used in this reaction, how many moles of ZnCl, are

produced?

First we need to convert form grams of HCl to moles of HCl, and then to moles of ZnCl...

We'll do this using the atomic weight of HCl (36.458 g/mol or 1 mol/36.458 g)

6.4 g HCl * [tex]\frac{1 mol HCl}{36.458 g HCl}[/tex] = 0.1755444621 mol HCl

Now we'll use the balanced chemical equation to convert from moles of HCl to moles of ZnCl..

Zn + 2HCl -> ZnCl2 + H2

We can see that for every 2 moles of HCl that react, 1 mol of ZnCl2 is produced..

So:

0.1755444621 mol HCl * [tex]\frac{1 mol ZnCl2}{2 mol HCl}[/tex] = 0.877722311 moles ZnCl2 are produced.

This can be estimated to 0.8777 moles ZnCl2

Answer:

a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

hope this helps ^^

Answer:

Acid reacts with water?

Explanation:

Answer: 6m/s

Explanation:

Speed is calculated as distance divided by time. Therefore, the speed of the traveling puck would be calculated as the distance travelled by the hockey puck divided by the time taken. This will be:

= 18m / 3s

= 6m/s

The answer is 6 meters per second