Care to help me guys please​

Answer:

1- water is ice

2- ice is water

Explanation:

1- the water is just froze

2- the ice is just solid water

Answer:

B. the gain of electrons

Explanation:

An easy way to remember this concept is the pneumonic OIL RIG:

Oxidation is Loss (of electrons)

Reduction is Gain (of electrons)

The sample of Carbon-14 after 28,575 years=0.001875 mg

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

Carbon-14 has a half-life of 5715 years, so t1/2=5715 years

A sample today contains 0.060 mg of carbon-14, so No=0.06 mg, then :

[tex]\tt Nt=0.06(\dfrac{1}{2})^{28575/5715}\\\\Nt=0.06(\dfrac{1}{2})^5\\\\Nt=0.001875~mg[/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:

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:

SI unit: kg/m³

but g/cm³ is commonly used

Explanation:

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

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]

Answer:

this showed that the cathode rays traveled in straight line

Answer:

2 8 18 8 those are the ones I believe.

Answer:

sgsgueiehéyegeysuegeteue2

Answer:

Explanation:

The answers you put are correct...

crest- A crest point on a wave is the maximum value of upward displacement within a cycle. A crest is a point on a surface wave where the displacement of the medium is at a maximum.

wavelength- In physics, the wavelength is the spatial period of a periodic wave the distance over which the wave's shape repeats. (how long the wave is)

trough- A trough is the opposite of a crest, so the minimum or lowest point in a cycle.

amplitude-  Amplitude, in physics, the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position. It is equal to one-half the length of the vibration path. ... Waves are generated by vibrating sources, their amplitude being proportional to the amplitude of the source.

Hope this helps! Have a great day!!  :D

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]

Mass of ZnO added=1.765 g

Given

30gms of 10%ZnO(Zinc oxide)

15% ZnO

Required

mass of ZnO added

Solution

Amount of ZnO in 30 gms of 10% ZnO =3 gms

For 15% ZnO : x= ZnO added

New solution = 30+x = 15%, so the equation :

[tex]\tt \dfrac{3+x}{30+x}=15\%\\\\15\%(30+x)=3+x\\\\4.5+0.15x=3+x\\\\1.5=0.85x\\\\x=1.765~gms[/tex]

Answer:

Lol

Explanation:

lol

nah

its b

i did the quiz and got it right it is b

Answer:

b

Explanation:

took test on edge

Answer:

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

Answer:

methyl ethyl ketone

Explanation:

(MEK)

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]

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

Answer:

decomposition reaction

Explanation:

oxygen is broken down from magnesium oxide (mgo)

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:

No it's not make device work

Explanation:

I think soo

Answer:

circulatory system, lymphatic system

Explanation:

I just did the assigment and got it right.

Answer:

The wick burning

Explanation:

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

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