PLEASE HELP i suck at chemistry ;(

Answer:

it is D

Explanation:

because it is a substance that participants in a chemical reaction.

23.458 g

Given

Reaction

H2SO4 + 2NaNO2 → 2HNO2 + Na2SO4

24.14714 g of Na2SO4

Required

mass of NaNO2

Solution

mol Na2SO4 :

= 24.14714 : 142,04 g/mol

= 0.17

From the equation, mol NaNO2 :

= 2/1 x mol Na2SO4

= 2/1 x 0.17

= 0.34

Mass NaNO2 :

= 0.34 x 68,9953 g/mol

= 23.458 g

Answer:

Explanation:

Using Gay lussac's law equation as follows;

P1/T1 = P2/T2

Answer:

A)Radio.

Explanation:

pls give me brainliest

Answer:

2

Explanation:

it is #2. the answer is 2

Answer:

Hope this will help you.... Take care

Answer:

number 7 or 3,5

Explanation:

sana po makatulong po sa inyo

Answer:

Explanation:Destructive interference occurs when the maxima of two waves are 180 degrees out of phase: a positive displacement of one wave is cancelled exactly by a negative displacement of the other wave. The amplitude of the resulting wave is zero.

If two waves that are completely out phase if meet they results in destructive interference. Hence, their intensities decreases for the resultant wave.

A wave of greater, lower, or the same amplitude is created when two waves merge through interference by combining their displacements at all points in space and time.

The interaction of waves that are coherent or correlated with one another, either because they originate from the same source or because their frequencies are similar or almost identical, leads to both constructive and destructive interference.

All sorts of waves, including light, radio, acoustic, surface water waves, gravity waves, and matter waves, can exhibit interference effects. In constructive interference, the waves are in single phase forms a resultant wave with higher amplitude.

When waves from out of phase meets, the resultant wave will have an amplitude less than the individual amplitudes.

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Explanation:

From top to bottom

transfer

substance

cooler

good

energy

metal

insulator

wood

heat

particles

particles

hotter

gases

convection

energy

Answer:

When you balance a chemical equation you change coefficients.You never change subscripts. A coefficient is a whole number multiplier. To balance a chemical equation you add the coefficients to make sure there are the same number of atoms on each side of the arrow.

Explanation:

Hope this helps. MARK BRAINLEST!!

Answer:

It helps them to swim

I think this ans may help you

Answer:

A glass bottle kept inside the container has sulphuric acid in it. When the knob of the extinguisher is pressed, the bottle breaks. The acid comes in contact with sodium carbonate and carbon dioxide is produced. The carbon dioxide comes out through the nozzle which is directed towards the fire.

The products in the reaction HCI + NaOH → NaCl + H20, are C. NaCl and H20.

The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is a neutralization reaction, which means that it produces a salt and water. In this case, the salt is sodium chloride (NaCl) and the water is H2O.

The other options are not correct because they do not include all of the products of the reaction. Option (A) includes HCl and NaOH, but it does not include H2O. Option (B) only includes HCl and NaOH. Option (D) only includes NaOH and H2O.

In conclusion, option C is correct.

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Answer:

OMG HOW COOL

Explanation:

Explanation:

The element with atomic number of 33 is Arsenic (As)

ionized and found to have a charge of -3.

The negative sign denotes that it gained an electron. So -3 means it gained 3 electrons.

How many electrons in the atom?

Total number of electrons = Number of electrons gained + Electrons in it's neutral state

Total electrons = 3 + 33 = 36

What is the isotope symbol of this atom ?

As³⁻ it has the same number of electrons with Krypton (Kr)

Answer:

Less than 0 °C, because B represents the temperature at which ice melts.

Explanation:

Answer: b. 100 °C, because it is the boiling point of water.

Explanation: i got it right on the test

Answer:

3m/s²

Explanation:

Force applied to an object can be calculated thus;

F = ma

Where;

F = force applied (Newtons)

m = mass of substance (kg)

a = acceleration (m/s²)

According to the information provided in this question, F = 12.0 newtons, m = 4.0 kg, a = ?

Derived from F = m.a

We have; a = F/m

a = 12/4

a = 3

The resultant acceleration of the object is 3m/s².

Answer:

The molecules are held closely together in a regular pattern called a lattice. If the ice is heated, the energy of the molecules increases. ... This is why liquid water is able to flow: the molecules have greater freedom to move than they had in the solid lattice.

Explanation:

I hope this helps and pls mark me brainliest :)

Answer:

yes

Explanation:

because this is a neutralization reaction that yield salt and water

Answer:

✓ Reactants

✓Reactants

✓ product

Explanation:

The substance(s) to the left of the arrow in a chemical equation are called ..................

A ............... is a substance that is present at the start of a chemical reaction.

A ................. is a substance that is present at the end of a chemical reaction.

Reactants are substances that undergo chemical reaction and are present at the beginning of the reaction and are consumed during the process of the reaction to form a product.

2H2 + O2 ------>2H2O

Here H2 and O2 are Reactants while water H2O is the product ( water)

Products are species that are produced after the chemical reaction have taken place.

Answer:

Explanation:

D

Answer:

Molecule?

Explanation:

I wanna say molecule, because all of the objects listed have that in common.

Answer:

Energy of the Reactant: increases

Energy of the product: not at all

Rate of reaction: increases

Enthalpy: not at all

Activation energy: decreases

Explanation:

Catalyst is a substance that increases the rate of reaction than normal to form a product.

Catalyst affect differently to different factors of reaction. A catalyst is meant to increase rate of reaction by lowering the activation energy, so that collision between reactant increase and that passes the energy barrier to form the product faster.

Catalyst has no effect on Enthalpy as change in enthalpy only depends on the chemical compositions of the reactants and products.

Catalyst also increases energy of reactant so that they can collide faster than before and do not affect the energy of product at all.

Hence, the correct answer is:

Energy of the Reactant: increases

Energy of the product: not at all

Rate of reaction: increases

Enthalpy: not at all

Activation energy: decreases

Answer:

125g × 1 mol/16 grams = 7.81 × avogadros #

Answer:

2 curies

Explanation:

This is actually pretty easy to explain.

The Radium-226 which is an isotope of the radium, have an activity of curie. This is basically used in radioactivity of certain elements.

As in both cases we have Radium -226 and we are only varying the mass of the Radium, then, we can just do a rule of 3 to calculate this:

1 g Ra-226 --------> 1 Curie

2 g Ra-226 -------->  X Curie

Solving for X:

X = 2 g * 1 Curie / 1 g

You can also see this by taking 2 grams of Ra per separate. On one side you have 1 g of Ra-226 and on the other side, you have another 1 g of Ra-226. Both have 1 Cury of activity. If you put both on the same side, you will have 1 Cury of 1 isotope plus 1 cury of the other isotope, final result? 2 curies.

Hope this helps

On combing Boyle’s law, Charles’s law, and Gay-Lussac’s law into a single proportional relationship law:

[tex]PV\propto T[/tex]

Explanation:

             [tex]P\propto \frac{1}{V}[/tex] ( Constant temperature)

             [tex]V\propto T[/tex]  (Constant pressure)

            [tex]P\propto T[/tex]   (Constant volume)

On combing Boyle’s law, Charles’s law, and Gay-Lussac’s law into a single proportional relationship law we get:

[tex]PV\propto T[/tex]

In the above relation all the three laws; Boyles law, Charles law, and Gay Lussac's laws are followed.

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Answer: The partial pressure of oxygen in the tank is 82.95 kPa.

Explanation:

According to Raoult's law, the partial pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the total pressure.

[tex]p_{O_2}=x_{O_2}\times P[/tex]  

where,

[tex]p_{O_2}[/tex] = partial pressure of oxygen

[tex]x_{O_2}[/tex] = mole fraction  of oxygen  

[tex]P[/tex] = Total pressure  

[tex]x_{O_2}=\frac{n_{O_2}}{n_{O_2}+n_{He}}[/tex],

where [tex]n_{O_2}[/tex] = moles of oxygen =[tex]\frac{68g}{32g/mol}=2.125[/tex]

[tex]n_{He}[/tex] = moles of Helium =[tex]\frac{32g}{4g/mol}=8[/tex]

[tex]x_{O_2}=\frac{2.125}{2.125+8}=0.210[/tex]

[tex]p_{O_2}=0.210\times 395kPa=82.95kPa[/tex]  

Thus the partial pressure of oxygen in the tank is 82.95 kPa.

Answer:

c

Explanation:

Answer:

down

Explanation:

Answer

(a) F

Pole Star is a star in the galaxy and hence not a part of the solar system.

(b) T

Mercury is the smallest planet in the solar system and Jupiter is the largest planet in the solar system.

(c) T

Uranus is the farthest planet to the sun in the solar system and Mercury is the closest planet to the earth in the solar system.

(d) T

INSAT or Indian National Satellite System is a series of artificial Indian satellites used for telecommunications, meteorology and search and rescue operations.

(e) F

There are eight planets in the solar system. They are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. Note the pluto is considered as a dwarf planet.

(f) F

Orion can be seen with naked eyes. It is one of the most magnificent constellations in the sky. It has seven or eight bright stars. Orion is also called the Hunter

In this exercise, we have to use our knowledge of astronomy to identify the correct alternatives, so we find that:

1)C

2)B

3)A

4)B

5)D

6)C

Then, based on astronomy knowledge, we can identify that the true alternatives correspond to:

1)A meteor happen a streak of light above bring into being by a meteor superlative through Earth's general feeling or mood.

2)Meteoroids exist lumps of rock or iron that revolution the brightest star, just as celestial body orbiting a star, asteroids, and comets act.

3)A coma happen the fuzzy-anticipate glow that maybe visualize situated on sides the head of a comet.

4)Halley's Comet, that happen 8 kilometres (5 miles) expansive and 16 km long, travels around the Sun each 75 to 76 age in an lengthened circuit.

5)Shooting stars exist existent what astronomers call meteors. Most meteors upset fashionable the gases around the earth before they reach the ground.

6)The celestial body orbiting a star belt happen a torus-form domain in the Solar System, situated about middle from two points the orbits of the celestial body orbiting a star Jupiter and Mars.

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