I really need help please and thank -you which two countries has dominated space exploration during the space race from 1955 to 1975
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Answer:

The Food Chain: The answer has to do with trophic levels. As you probably know, the organisms at the base of the food chain are photosynthetic; plants on land and phytoplankton (algae) in the oceans. These organisms are called the producers, and they get their energy directly from sunlight and inorganic nutrients.

Explanation:

Brainliest?

Explanation:

sodium nitrate is most soluble at 90C.

Solubility is the ability to get dissolved. The salt of sodium is the most soluble salt at 90 degrees.

Solubility is the compound's or substance's ability to get dissolved in the solvent for the formation of the solution. It depends on several factors like hydration energy, temperature, pressure, and lattice energy.

The size of sodium is small, it has less lattice energy compared to the hydration energy and can get readily dissolved as it can create a sphere around other ions to form the solution.

Therefore, sodium salt is the most soluble at 90 degrees celsius.

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Answer:

The stable ion the sulfur would form is the sulfide ion,

Explanation:

When any atom accept electrons it converts into negative ion/an anion. So it will change into Z 3− after gaining 3 electrons.

Sulfur is an elemental atom that has an atomic number of 16 and an atomic mass of 32.065 amu. If the sulfur atom gains three protons then potassium will be formed.

A proton has been a sub-atomic particle that has been known to carry a positive charge and are tend to remain inside the nucleus with the neutrons bonded together by the nuclear force.

The proton of the atom is the characteristic property of the element in the periodic table. They are the sole sub-atomic particle that gives the atomic number of the elemental atom.

The sulfur atom has the atomic number 16 which means it has 16 protons, so if three protons are added to it then the number f protons become 19 which is an atomic number of the potassium (K) element.

Therefore, a potassium element is formed.

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Answer:

D. It would have a net negative charge

Explanation:

In an atom, there are electrons, protons and neutrons collectively called SUBATOMIC PARTICLES. The charge of an atom is determined by the number of electrons and protons in that atom. A neutral or uncharged atom possess the same number of electrons and protons.

The charge can thus be calculated as follows:

Charge of atom = no. of protons - no. of electrons.

Hence, when the number of electrons in an atom is higher than that of the protons, it means that the atom has gained negatively charged electrons, making that atom have a net negative charge. For example, In an atom that contains 10 protons and 11 electrons, the charge of that atom will be (10 - 11) = -1. The net charge of that atom will be -1, which is NEGATIVE.

Answer:

The Midochondria Is the function of the nucleus

Answer:

HCl, ya que la sustancia es una base que se debe titular con un ácido.

Explanation:

¡Hola!

En este caso, teniendo en cuenta la descripción inicial de la sustancia, la cual se torna violeta cuando se le agrega la fenolftaleína, es posible inderir que esta sustancia es una base con pH básico. Ahora bien, en torno a la especificación de un proceso de titulación, es claro que dicha base debe ser titulada con un ácido, y este caso, con HCl, ácido chlorhídrico, con el fin the alcanzar el punto de equivalencia.

¡Saludos!

Answer:

3) Rubidium reacts with rubidium nitrate to produce rubidium oxide and nitrogen gas

a- Write the chemical reaction

10Rb + 2RbNO3 → 6Rb2O + N2

Answer:

Explanation:

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Answer:

1. As+H2=AsH3

2. draw a line under the problem with this:

A = 1            | A = 1

H = 2           | H = 3

3. We need everything to be equal (2x3 to get 6 then count the As on the product side to get the 2, then add 2 A on the reactant side):  

A = 2            | A = 2

H = 6           | H = 6

4. 2As + 3H2 = 2AsH3

hope this helps

Answer:

A

Explanation:

The statement made by Zoe as follows "We can do better. We must eat healthier and exercise. Will you join me?” is an effective conclusion because it leaves a lasting impression for the audience.

Public speakers are those who speak to a group of people in a structured manner.

However, asides presenting a spectacular body message, the conclusion must leave a lasting impression on the audience to enable them practice what was presented.

According to this question, Zoe made a conclusive statement as follows: "We can do better. We must eat healthier and exercise. Will you join me?”. This statement is an effective conclusion because it makes a lasting impression.

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Answer:

0.3?

Explanation:

6:c

7: might be ice but im not really sure, hope you do well.

Explanation:

Answer:

I think it's (A)

Explanation:

When converting find the (atm) as listed above.

As you know decimal, binary, octal and hexadecimal number systems are positional value number systems. To convert binary, octal and hexadecimal to decimal number, we just need to add the product of each digit with its positional value.

P.S: Sorry if I'm wrong I tried my best. Best wishes!!! And here's some sparkles ✨ (◍•ᴗ•◍)✧*。!!!

Answer:

All of our energy comes from the sun.

Explanation:

The sun sends out huge amounts of energy through its rays every day. Without the sun, life on earth would not exist, since our planet would be totally frozen.

Answer:

D. Cytokinesis

Explanation:

Mitosis is the cell division that involves the synthesis of two genetically identical daughter cells. Mitotic division occurs in stages namely: prophase, metaphase, anaphase and telophase. Following this four processes is another called CYTOKINESIS

Cytokinesis, which occurs after nuclear division, is the division of the cytoplasm. According to this question, the observation made when viewing the specimen was that "the cell has a narrow middle part which almost separates into two bulging ends and which looks like the number 8". This described the process of CYTOKINESIS in plant cell specifically.

Explanation:

a.H2PO4 + 2KOH = K2PO4 + 2H2O

b. H2PO4 _ 2KOH

1(2) + 31 + 16(4) _ 2(23) + 2(16) + 2(1)

2 + 31 + 64 _ 46 + 32 + 2

97 _ 80

no of moles of H2PO4 = 2.5 ÷ 97

= 0.026mol

no of moles of 2KOH = 4 ÷ 80

= 0.05mol

2KOH is the limiting reactant

c. H2PO4 is the excess reactant

d. 1 mole H2PO4 weighs 2.5g

0.026mol H2PO4 weighs g

(0.026 × 2.5)

H2PO4 weighed 0.065g after reaction

Answer:

1. 250 J

2. 500000 J

3. 146250 J

4. 400 J

Explanation:

1. Determination of the energy of the ball.

Mass (m) = 5 Kg

Velocity (v) = 10 m/s

Energy (E) =?

E = ½mv²

E = ½ × 5 × 10²

E = 2.5 × 100

E = 250 J

2. Determination of the energy of the rock.

Mass (m) = 250 Kg

Height (h) = 200 m

Acceleration due to gravity (g) = 10 m/s²

Energy (E) =?

E = mgh

E = 250 × 10 × 200

E = 500000 J

3. Determination of the energy of the car.

Mass (m) = 1300 Kg

Velocity (v) = 15 m/s

Energy (E) =?

E = ½mv²

E = ½ × 1300 × 15²

E = 650 × 225

E = 146250 J

4. Determination of the energy of the bullet.

Mass (m) = 0.005 Kg

Velocity (v) = 400 m/s

Energy (E) =?

E = ½mv²

E = ½ × 0.005 × 400²

E = 0.0025 × 160000

E = 400 J

Answer:

Sorry for the late answer but

Number 1 is 250 J

Number 2 is 500000 J

Number 3 is 146250 J

Number 4 is 400 J

Explanation:

Answer:

1. Fe₂O₃ : Al = 1 : 2

2. Fe₂O₃ : Al₂O₃ = 1 : 1

3. Fe₂O₃ : Fe = 1 : 2

Note: The question is incomplete. The complete question is given below :

A thermite reaction releases large amounts of heat and light, resulting in the melting of the iron metal that forms during the reaction. The balanced chemical equation is given below: Fe₂O₃(s) + 2Al(s) ---> Al₂O₃(s) + 2Fe(l) Determine the correct mole ratios for the following substances, based on this chemical equation.

Explanation:

A thermite reaction is a highly exothermic reaction that occurs between a mixture of powdered aluminium and iron (iii) oxide.

The reaction is a redox reaction which produces aluminium oxide and metallic iron.

The heat given out in the reaction melts the iron formed. It is used to join railway tracks or cracked machine parts. The molten iron runs down between the tracks and welds them together.

The balanced equation of the reaction is given below :

Fe₂O₃(s) + 2Al(s) ---> Al₂O₃(s) + 2Fe(l) + Heat

The mole ratio of the reactant and products are as follows:

1. 1 mole of Iron (iii) oxide and 2 moles of aluminium are combined

Fe₂O₃ : Al = 1 : 2

2. 1 mole of aluminium oxide is produced from 1 mole of iron (iii) oxide

Fe₂O₃ : Al₂O₃ = 1 : 1

3. 2 moles of of iron are produced from 1 mole of iron (iii) oxide

Fe₂O₃ : Fe = 1 : 2

Answer: Blank 1: 6

Blank 2: 1

Blank 3: 7

Explanation:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation. Explanation: According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

The balanced chemical equation will be:

[tex]6H_3BO_3\rightarrow H_4B_6O_{11}+7H_2O[/tex]

Answer:

A. 324 J

Explanation:

Answer: The new volume of baloon filled with nitrogen is 2.8 L

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.

We are given:

[tex]V_1=2.5L\\T_1=298K\\V_2=?\\T_2=333K[/tex]

Putting values in above equation, we get:

[tex]\frac{2.5}{298}=\frac{V_2}{333}\\\\V_2=2.8L[/tex]

Thus the new volume of baloon filled with nitrogen is 2.8 L

Answer:

K = 0.5

Explanation:

Based on the reaction:

PCl₃ + Cl₂ ⇄ PCl₅

The equilibrium constant, K, is defined as:

K = P PCl₅ / P PCl₃ * P Cl₂

Where P represent the pressure at the equilibrium for each one of the gases involved in the equilibrium.

As:

P PCl₅ = 1.0atm

P PCl₃ = 1.0atm

P Cl₂ = 2.0atm

K = 1.0atm / 1.0atm * 2.0atm

Answer:      A. Frequent earthquakes

Explanation:

Answer:

10 must be added

Explanation:

Answer:

The carrying capacity has changed

Explanation:

By adding in the help bugs, the gardener increased the amount of food available for the predators who eat the help bugs, these are the spiders.

The enviroment for spiders now has more food, and can carry more spiders in it.