Please help me answer this first question.

Answer:the sun

Explanation:leqjs

Let's look it up

Aluminium:-

Water:-

Alcohol:-

Cooking oil:-

Answer:

The answer is option 4.

Explanation:

Chloroplast is the place where they absorb sunlight to perform photosynthesis to produce food.

Answer:

Chemical energy _ thermal energy

Answer:

compound is the answer

Answer: The correct formula is [tex]MgBr_2[/tex]

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here magnesium is having an oxidation state of +2 called as [tex]Mg^{2+}[/tex] cation and bromine [tex]Br^{-}[/tex] is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral [tex]MgBr_2[/tex].

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

Answer:

nonpolar covalent

Explanation:

Comparing their electronegativities will help determine the type of bond. Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. The difference in electronegativity (ΔEN)  is used to determine bond type. Hydrogen has an electronegativity of 2.20 and sulfur has 2.58. The difference is 0.38,so the electrons are shared in a nonpolar covalent bond.

Answer:

B) 101,025

Explanation:

1000g * 0.449 J/g Celsius * 225 Celsius = 101,025

I got 225C from 250C - 25C

Answer:

SEE EXPLANATION

Explanation:

If i refer to the bottle at the left hand side as A and the bottle at the right hand side as B. I can say that the bottle A contains solutes which are more soluble than the solutes in bottle B. consequently, A has a lower vapour pressure than B.

We can also see that the pressure in A is much higher than in B(as indicated by the length of the arrows). The higher the pressure, the greater the solubility of the gas.  Henry's Law states that: The solubility of a gas in a liquid is directly proportional to the pressure of that gas above the surface of the solution.

Again let me call  the beaker on the left A and the beaker on the right B. We can see that the beaker on the left contains 10 ml of solution while the beaker on the right contains 50 ml of solution. It follows that beaker A contains a more concentrated solution since that much amount of solute is contained in a smaller volume than in beaker B as shown in the image.

Answer:

It contain double Bond.

Explanation:

To determine weather the bond is double or triple simply check the electron involved in mutual sharing of an electron if 2 electron takes parts it said to be double or if 3 it said to be triple.

Answer:

Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called corolla.

Ranks the objects from most to least dense : X,Z,Y,W

Given

Object W : m=16 g, V=84 cm³

Object X : m=12 g, V= 5 cm³

Object Y : m=4 g, V= 6 cm³

Object Z : m=408 g g, V= 216 cm³

Required

Density

Solution

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

1. Object W

[tex]\tt \rho=\dfrac{16}{84}=0.19[/tex]

2. Object X

[tex]\tt \rho=\dfrac{12}{5}=2.4[/tex]

3. Object Y

[tex]\tt \rho=\dfrac{4}{6}=0.67[/tex]

4. Object Z

[tex]\tt \rho=\dfrac{408}{216}=1.89[/tex]

From most to least dense : X,Z,Y,W

Answer:

Mass = 26.58 g

Explanation:

Given data:

Mass of lithium nitride = 12.87 g

Mass of lithium hydroxide produces = ?

Solution:

Chemical equation:

Li₃N + 3H₂O     →    3LiOH + NH₃

Number of moles of of Li₃N:

Number of moles = mass/molar mass

Number of moles = 12.87 g/ 34.83 /mol

Number of moles = 0.37 mol

now we will compare the moles of lithium nitride  with lithium hydroxide.

                  Li₃N            :            LiOH

                     1                :             3

                 0.37              :           3/1×0.37 = 1.11 mol

Mass of LiOH:

Mass = number of moles × molar mass

Mass = 1.11 mol × 23.95 g/mol

Mass = 26.58 g

Answer:

B. hydrogen only.

Explanation:

The element hydrogen is a made up of only hydrogen atoms which are the particles in the element.

Hydrogen is an element. It has distinct hydrogen atoms that typifies it.

An element is a distinct substance that is made up of one kind of atom. The only kind of atom in element hydrogen is those hydrogen itself.

Answer:

A

Explanation:

it is A because all of the other ones are opinions.

Answer:

A

Explanation:

Explanation:

Moles of Barium hydroxide = 0.156dm³ * (0.247mol/dm³) = 0.0385mol.

Mass of Barium hydroxide = 0.0385mol * (171.346g/mol) = 6.60g.

Answer:

6.60

Explanation:

Answer: a  capillaries

Explanation:

The answer is 87.62 u

Answer:

Atomic number: 38

Electrons per shell: 2,8,18,8,2

Symbol: Sr

Answer:

glycol, any of a class of organic compounds belonging to the alcohol family; in the molecule of a glycol, two hydroxyl (―OH) groups are attached to different carbon atoms. The term is often applied to the simplest member of the class, ethylene glycol.

Explanation:

Answer:

Glycol, any of a class of organic compounds belonging to the alcohol family; in the molecule of a glycol, two hydroxyl (―OH) groups are attached to different carbon atoms. The term is often applied to the simplest member of the class, ethylene glycol.

Answer:

its true methane is used as a fuel gas

Explanation:

Answer:A

Explanation: A

Answer:

d.

Explanation:

The term known as "Nuclear Fusion" is a very important concept in chemistry and it is studied mostly under the topic or aspect of Chemistry known as or called radioactivity. Nuclear Fusion is the kind of reaction in which two or more atomic nucleus combines to for bigger ones.

There is a saying that there is no life without nuclear fusion because it is the reaction that causes the stars to have light.

Option 'd' is correct. This is what happens in stars in order for light to be produced that is the inward movement of gravity and the outward movement of nuclear fusion.

The empirical formula of the compound is C₃H₄O₂

From the question given above, the following data were obtained:

Carbon = 50.04%

Hydrogen = 5.59%

Oxygen = 44.37%

Divide by their molar mass

C = 50.04 / 12 = 4.17

H = 5.59 / 1 = 5.59

O = 44.37 / 16 = 2.773

Divide by the smallest

C = 4.17 / 2.773 = 1.5

H = 5.59 / 2.773 = 2

O = 2.773 / 2.773 = 1

Multiply by 2 to express in whole number

C = 1.5 × 2 = 3

H = 2 × 2 = 4

O = 1 × 2 = 2

Therefore, the empirical formula of the compound is C₃H₄O₂

Learn more: https://brainly.com/question/15907539

Answer:

Chloroplast.

Explanation:

Answer:

chlorophat

Explanation:

Answer:

3.2 micro gram

Explanation:

because

1kg=1000g

32×10^-10kg=?

=3.2×10^-6g

1g=10^-6micro gram

3.2×10^-6g=?

=3.2 micro gram.

where g- gram

kg- kilogram

Answer: Photosynthesis

Explanation:

A 72 kg object moving 25 m/s will require the greatest amount of force

Given

mass of object and the velocity

Required

the greatest amount of force

Solution

Newton's 2nd law :

∑F = m. a  

F = force, N  

m = mass = kg  

a = acceleration due to gravity, m / s²  

Assuming the object is moving from rest (vo = 0) and the time needed to reach its velocity is the same (delta t = equal), it can be formulated:

[tex]\tt \Sum F=m.\dfrac{v_f-v_i}{\Delta t}\\\\F=m.\dfrac{v_f}{\Delta t}[/tex]

So the force on an object depends on the product of its mass and velocity

Or if we use the impulse and momentum formula

[tex]\tt F.\Delta t=m(v_f-v_i)\\\\F,\approx m.v_f[/tex]

So that we determine which is the greatest from the multiplication of mass and velocity will produce the greatest force as well

A 72 x 25 = 1800

B. 55 x 32 =1760

C. 75 x 22 = 1650

D.63 x 27 = 1701

Option A has the greatest force

Answer:

The relative atomic mass of chlorine depends on the ratio between the abundance of these two naturally-occurring isotopes.

Explanation:

The relative atomic mass of an element is a weighted average of the atomic mass of its naturally-occurring isotopes. The relative abundance of each isotope gives its weight in this weighted average.

For these two naturally-occurring isotopes of chlorine:

[tex]\begin{array}{|c|c|c|}\cline{1-3} \text{Isotope} & \text{Atomic Mass} & \text{Relative Abundance}\\ \cline{1-3} ^{35}{\rm Cl} & \approx 34.968\; \rm Da} & \approx 0.758 \\ \cline{1-3} ^{37}{\rm Cl} & \approx 36.966\; \rm Da & \approx 0.242 \\ \cline{1-3}\end{array}[/tex].

[tex]\begin{aligned}&\text{relative atomic mass of Cl} \\ &= \text{atomic mass of $^{35}{\rm Cl}$} \times \text{relative abundance of $^{35}{\rm Cl}$} \\&\quad + \text{atomic mass of $^{37}{\rm Cl}$} \times \text{relative abundance of $^{37}{\rm Cl}$} \\ &\approx 34.968\; \rm Da \times 0.758 + 36.966\; \rm Da \times 0.242 \\ &\approx 35.45\; \rm Da \end{aligned}[/tex].

The relative abundance of [tex]^{35}{\rm Cl}[/tex] is much higher than that of [tex]^{37}{\rm Cl}[/tex]. Consequently, the relative atomic mass of the element [tex]\rm Cl[/tex] is closer to the atomic mass of [tex]^{35}{\rm Cl}\![/tex] than that of [tex]^{37}{\rm Cl}\![/tex].

Answer:

ANIMAL CELL

Animal cells are generally small in size.

They don't have a cell wall

Except the protozoan Euglena, no animal cell possesses plastids.

Vacuoles in animal cells are many, small and temporary.

Animal cells have a single highly complex and prominent Golgi apparatus.

Animal cells have centrosome and centrioles.

PLANT CELL

Plant cells are larger than animal cells.

The plasma membrane of plant cells is surrounded by a rigid cell wall of cellulose.

They have Plastids

Most mature plant cells have a permanent and large central sap vacuole.

Plant cells have many simpler units of Golgi apparatus, called dictyosomes.

Plant cells lack centrosome and centrioles.

Hope this helps!

Answer: Differences between animal and plant cells :

Explanation:

Answer:

ΔH = -110.5kJ

Explanation:

It is possible to obtain enthalpy of combustion of a particular reaction by the algebraic sum of similar reactions (Hess's law). Using:

1. C(s) + O₂(g) → CO₂(g) ΔH₁ = -393.5kJ

2. CO(g) + 1/2O₂(g) → CO₂(g) ΔH₂ = -283.0kJ

The sum of 1 -2 gives:

C(s) + O₂(g) + CO₂(g) → CO₂(g) + CO(g) + 1/2O₂(g)

C(s) + 1/2O₂(g) → CO(g) ΔH = -393.5kJ - (-283.0kJ) =