All categories

2 years ago

Help me please I’m struggling very bad

Chemistry

2 answers:

djyliett [7]2 years ago

5 0

Answer:

Answer in explanation below!

Explanation:

Box 1 : Eukarya - this is the domain of organisms that have cells enclosed within a nuclear envelope

Box 2: Protista - any eukaryotic organism that is not an animal, plant or fungus

Box 3: Fungi - they can be single celled ( unicellular ) or multicellular

Box 4: Eubacteria - they are prokaryotic microorganisms

I hope this helps, good luck!

USPshnik [31]2 years ago

3 0

Answer:

I answered on the other thread! <3

Explanation:

You might be interested in

Which chemical reaction needs more energy to break bonds in the reactants

MA_775_DIABLO [31]

Answer:An endothermic reaction

Explanation: In an endothermic reaction, it takes more energy to break the bonds of the reactants than is released when the bonds in the products are formed. In an endothermic reaction, the temperature goes down.

6 0

3 years ago

Read 2 more answers

What force works against gravity as water infiltrates the soil and moves

love history [14]

Answer:

Answer is option B . This is because water is said to be highly permeable to the underground soil and thus nourishes it , whereas capillary action will make the water flow upward sllowly , but the water is going underground so it is permeability. Also soil is porous too , but that's only if the water is in the soil , here the water is caused to go underground by some force , so porosity isnt the right option

Explanation:

3 0

3 years ago

Read 2 more answers

The energy of a photon needed to cause ejection of an electron from a photoemissive metal is expressed as the sum of the binding

slega [8]

Answer:

$Binding\ energy=43.43\times 10^{-20}\ J$

Explanation:

Using the expression for the photoelectric effect as:

$E=h\nu_0+\frac {1}{2}\times m\times v^2$

Also, $E=\frac {h\times c}{\lambda}$

$\nu_0=\frac {c}{\lambda_0}$

Applying the equation as:

$\frac {h\times c}{\lambda}=\frac {hc}{\lambda_0}+\frac {1}{2}\times m\times v^2$

Where,

h is Plank's constant having value $6.626\times 10^{-34}\ Js$

c is the speed of light having value $3\times 10^8\ m/s$

$\lambda$ is the wavelength of the light being bombarded

Given, $\lambda=4.00\times 10^{-7}\ m$

$\frac {hc}{\lambda_0}$ is the binding energy or threshold energy

$\frac {1}{2}\times m\times v^2$ is the kinetic energy of the electron emitted. = $6.26\times 10^{-20}\ J$

Thus, applying values as:

$\frac{h\times c}{\lambda}=Binding\ Energy+Kinetic\ Energy$

$\frac{6.626\times 10^{-34}\times 3\times 10^8}{4.00\times 10^{-7}}\ J=Binding\ Energy+6.26\times 10^{-20}\ J$

$\frac{19.878}{10^{19}\times \:4}\ J=Binding\ Energy+6.26\times 10^{-20}\ J$

$49.69\times 10^{-20}\ J=Binding\ Energy+6.26\times 10^{-20}\ J$

$Binding\ energy=43.43\times 10^{-20}\ J$

5 0

3 years ago

In the reaction 2k (s) + 2h2oh (aq) + h2 (g) which of the reactants is a solid

Y_Kistochka [10]

Answer is A. Because K is potassium which is a metal

4 0

2 years ago

How many grams of Br are in 255 g of CaBr2?

Scilla [17]

Molar mass:

Br = 79.904 g/mol
CaBr2 = 199.886 g/mol

<span>CaBr2 = 2 Br + Ca
</span>
199.886 g --------------- 2 x 79.904 g
255 g -------------------- ?? ( mass of Br )

255 x 2 x 79.904 / 199.886 =

40751.04 / 199.886 =>203.87 g of Br

hope his helps!

8 0

3 years ago