Write true or false next to each of these statements.
2.
a All metals are magnetic. .......
b Solid non-metals are brittle.
(All metals are solids.
d Metals conduct heat energy.
..
e Non-metals are good conductors of electricity.
mata​

Answer:

1- water is ice

2- ice is water

Explanation:

1- the water is just froze

2- the ice is just solid water

Moles of Nitrogen(N₂) gas would be produced : 1.09

The reaction coefficient in a chemical equation shows the mole ratio of the components of the reactants and products

If one mole of the reactant or product is known, then we can determine the moles of the other compounds involved in the reaction

Reaction

2NH₃(g) + 3CuO (s) ⇒ 3Cu(s) + N₂(g) + 3 H₂O(g)​

Copper(II) oxide was reacted with excess Ammonia, so CuO as a limiting reactant and moles of the product is based on moles of CuO

moles of CuO = 3.27

From the equation, the mol ratio of CuO : mol N₂ = 3 : 1, so mol  N₂ :

[tex]\tt \dfrac{1}{3}\times 3.27=1.09[/tex]

Answer:

this showed that the cathode rays traveled in straight line

Answer:

mayonnaise contains an extra substance, called an emulsifier, which is used to unite the two immiscible ingredients to form a stable, usable emulsion. The emulsifier is made from a hydrophilic (water-loving) head and a hydrophobic (water-hating) tail, which work together to stop the oil from separating out.

Answer:

Hello here it is

Explanation:

The smaller the droplets, the thicker and whiter the mayonnaise. The droplets of oil are suspended in the small amount of water supplied by the yolk and vinegar. They're so tightly packed, they can barely move, but stay separated from one another because they're coated with a thin layer of emulsifiers.

Answer:

The wick burning

Explanation:

Answer:

25.89  × 10²³ molecules

Explanation:

Given data:

Mass of CoCl₂ = 560 g

Number of molecules present = ?

Solution:

Number of moles of CoCl₂:

Number of moles = mass/molar mass

Number of moles = 560 g/ 129.84 g/mol

Number of moles = 4.3 mol

Avogadro number:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

4.3 mol ×  6.022 × 10²³ molecules /1 mol

25.89  × 10²³ molecules

Answer:

5.89× 10²³ atoms of Ca

Explanation:

Given data:

Mass of Ca = 39.2 g

Number of atoms = ?

Solution:

Number of moles of Ca:

Number of moles = mass/molar mass

Number of moles = 39.2 g/40.078 g/mol

Number of moles = 0.978 mol

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

0.978 mol ×  6.022 × 10²³ atoms / 1 mol

5.89× 10²³ atoms of Ca

Answer:

methyl ethyl ketone

Explanation:

(MEK)

Answer:

2918.4 torr

Explanation:

From;

PV=nRT

We have that the new conditions of the gas are;

V = 12.0 L

T1 = 177 + 273 = 450 K

n = 1.25 mol

R= 0.082 atm LK-1mol-1

P= ?

P = nRT/V

P = 1.25 *  0.082 * 450/12.0

P = 3.84 atm

Since

1 atm = 760 torr

3.84 atm = 3.84 * 760 = 2918.4 torr

Answer:

circulatory system, lymphatic system

Explanation:

I just did the assigment and got it right.

The rate of disappearance of chlorine gas : 0.2 mol/dm³

The reaction rate (v) shows the change in the concentration of the substance (changes in addition to concentrations for reaction products or changes in concentration reduction for reactants) per unit time.

For reaction :

[tex]\tt aA+bB\rightarrow cC+dD[/tex]

The rate reaction :

[tex]\tt -\dfrac{1}{a}\dfrac{d[-A]}{dt}= -\dfrac{1}{b}\dfrac{d[-B]}{dt}=\dfrac{1}{c}\dfrac{d[C]}{dt}=\dfrac{1}{d}\dfrac{d[D]}{dt}[/tex]

Reaction for formation CCl₄ :

CH₄+4Cl₂⇒CCl₄+4HCl

From equation, rate of reaction = rate of formation CCl₄ = 0.05 mol/dm³

Rate of formation of  CCl₄  = reaction rate x coefficient of  CCCl₄

0.05 mol/dm³ = reaction rate x 1⇒reaction rate = 0.05 mol/dm³

The rate of disappearance of chlorine gas (Cl₂) :

Rate of disappearance of  Cl₂  = reaction rate x coefficient of  Cl₂

Rate of disappearance of  Cl₂ = 0.05 x 4 = 0.2 mol/dm³

Answer:

Shape- square planar , hybridisation-sp3

Explanation:

Shape:

a=b=33400 J

c=4180 J

Further explanation

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

The heat to change the phase can be formulated :

Q = mLf (melting/freezing)

Q = mLv (vaporization/condensation)

Lf=latent heat of fusion

Lv=latent heat of vaporization

The heat of fusion for water at 0 °C : 334 J/g and the heat of vaporization at 100 °C : 2,230J/g

a. melting

[tex]\tt Q=100.334=33400~J[/tex]

b. freezing

[tex]\tt Q=100.334=33400~J[/tex]

c.raise the temperature(c water = 4.18 J/g C)

[tex]\tt Q=100\times 4.18\times (20-10)=4180~J[/tex]

Answer: The strange liquid would float to the top of a cup of water.

Explanation:

Density = Mass/Volume

Strange Liquid Density = 70g/84mL

Strange Liquid Density = 0.833g/mL

Density of water in g/mL = 1 g/mL

Strange Liquid Density < Water Density

A substance with a lower density would be suspended above a substance with a higher density.

Since the density of the strange liquid is less than that of water, it would float to the top of a cup of water.

Answer:

Explanation:

The potential energy of a body can be found by using the formula

PE = mgh

where

m is the mass

h is the height

g is the acceleration due to gravity which is 10 m/s²

From the question we have

PE = 0.95 × 10 × 30

We have the final answer as

Hope this helps you

Answer:

You need to add more points people will not answer if its this low

Explanation:

Answer:

No it's not make device work

Explanation:

I think soo

Answer:

Lol

Explanation:

lol

nah

Answer:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

Answer:

2 8 18 8 those are the ones I believe.

The new temperature : 11.56 °C

Boyle's law and Gay Lussac's law  

[tex]\tt \dfrac{P_1.V_1}{T_1}=\dfrac{P_2.V_2}{T_2}[/tex]

P1 = initial gas pressure (N/m² or Pa)  

V1 = initial gas volume (m³)  

P2 = final gas pressure  

V2 = final gas volume

T1 = initial gas temperature (K)  

T2 = final gas temperature  

V₁=4.39 L

T₁=44+273=317 K

P₁ = 729 torr = 0,959211 atm

V₂=3.78 L

P₂= 1 atm

[tex]\tt \dfrac{0.959211\times 4.39}{317}=\dfrac{1\times 3.78}{T_2}\\\\T_2=\dfrac{1\times 3.78\times 317}{0.959211\times 4.39}\\\\T_2=284.559~K=11.56~C[/tex]

Explanation:

The reaction forms calcium hydroxide, Ca(OH)2 and hydrogen gas (H2). The calcium metal sinks in water and after an hour or so bubbles of hydrogen are evident, stuck to the surface of the metal.

Answer: B) calcium hydride + water -> calcium hydroxide + hydrogen

Explanation: B) on EDG

Answer:

Article is

I was born in the west .

Answer:

206 kj of heat is required to boil 78.5 kg of water at its boiling point

A nucleus is an organelle found in the eukaryotic cells. Inside it's fully enclosed nuclear membrane, it contains the minority of the cell's genetic material. This material would be called DNA molecules.

Hope this helps! If not I'm so sorry. Have a lovely day

The element Ar classified as noble gas in the periodic table. Therefore, the correct option is option A.

The noble gases are a group of chemical elements that share several characteristics. They are all monatomic, odourless, and colourless gases with relatively little chemical reactivity under normal conditions. Oganesson (Og) is a highly radioactive element created synthetically.

Although the IUPAC has included oganesson since "group 18" and "noble gas" have been used interchangeably, oganesson may not be appreciably chemically noble and therefore is projected to deviate from the norm and just be reactive owing to relativistic effects. Its chemistry is still being studied due to the exceptionally short 0.7 ms ½ of its sole known isotope. The element Ar classified as noble gas in the periodic table.

Therefore, the correct option is option A.

To know more about noble gas, here:

https://brainly.com/question/7036466

#SPJ7