Help only if you know the answer

Answer:

on your own?

Explanation:

it sticks better in your head once you fail

im sorry i dont know this i really need points for my maths test

Answer:

It depends on the situation. Most things are better learning from others because others can see what you cant. On the other hand there are some situations were only you can learn from. Take pain as an example. Others can talk about pain as much as they would like but your body dosent know what that feels like unless it feels it on its own and learns from it. An example of learning from others would be smarts such as math, science, history and so forth.

Explanation:

This problem is providing the mass of salt, 15 g, that is dissolved in 100 mL of water, so its concentration is required and found to be 15 % according to the following calculations:

In chemistry, units of concentration in solutions are used to represent the relative amount of a solute that is dissolved in a solvent. Thus, in this case, we refer to a salt-water solution, whose concentration is calculated via:

[tex]\% m=\frac{m_{salt}}{m_{water}}*100\%[/tex]

In such a way, given the mass of salt, 15 g and volume of water, or solution, 100 mL, one obtains the following:

[tex]\% m=\frac{15g}{100g}*100\% \\\\\% m=15\%[/tex]

Learn more about by mass percent: https://brainly.com/question/5394922

Answer:

D) 15%

Explanation

Explanation:

to see how a change in a reactant concentration would affect the speed of the chemical reaction

Salt water contains minerals other than salt.

The temperature of ocean water is affected by the depth of the water.

The temperature of ocean water is affected by the ocean’s location.

Objects float more easily in oceans than in lakes or rivers.

These are all of the true answers

Answer:

First one and the last three

Explanation:

hope it helps

Answer:

The application of reflection in the use of the microscopes.

Explanation:

Reflection is one of the properties of light. Reflection is a phenomenon whereby light waves hitting a surface is bounced off. Reflection helps us to see light and colors. This behavior of light is harnessed in the design of the microscope.

The light reflected by the microscope helps the researcher to view the specimen in his slide. Also, the mirrors placed in measuring devices reflects light that helps an observer to take an accurate reading.  

Answer: D

Explanation:

Weight by definition is mass multiplied by the acceleration of gravity. So, weight is the force of gravity

Answer:

I think it would be D. None of the above

Explanation:

why I think this is because none of the answers really adds up to it

Answer:

Displacement Reaction.

Answer:

displacement reaction

Answer:

atom 1 and atom 2

Explanation:

Answer:

An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An ethothermic process absorbs heat and cools the surroundings. Hope this helped.

The easiest way to explain endo and exothermic reactions are that endothermic reactions absorb energy and exothermic reactions release energy.

The way I remember this is that with exothermic reactions, the heat exits. Endothermic is just the opposite.

Hope this helps :)

Answer:

B. When energy changes form one to another.

Explanation:

Energy transformation, also known as energy conversion, is the process of changing energy from one form to another. In physics, energy is a quantity that provides the capacity to perform work or provides heat.

Answer:

B. your mass would be more on jupiter because it has more gravitational force.

Explanation:

good luck must be a test

Answer:

78.04g of 0.448 moles must be added

Explanation:

Using H-H equation we can find the pH of the buffer:

pH = pKa + log [A⁻] / [HA]

Where pH is the pH of the buffer = 7.2

pKa = 7.1

[A⁻] = [K₂HPO₄]

[HA] = [KH₂PO₄]

Replacing:

7.2 = 7.1 + log [K₂HPO₄] / [KH₂PO₄]

0.1 = log [K₂HPO₄] / [KH₂PO₄]

1.2589 = [K₂HPO₄] / [KH₂PO₄] (1)

And as the  concentration of the buffer is:

1M = [K₂HPO₄] + [KH₂PO₄] (2)

Replacing (2) in (1):

1.2589 = 1M - [KH₂PO₄] / [KH₂PO₄]

1.2589 [KH₂PO₄] = 1M - [KH₂PO₄]

2.2589 [KH₂PO₄] = 1M

[KH₂PO₄] = 0.44M

And [K₂HPO₄] = 0.56M

In 800mL = 0.8L:

0.8L * (0.56mol / L) = 0.448 moles K₂HPO₄. The mass is -Molar mass K₂HPO₄: 174.2g/mol-:

0.448 moles * (174.2g / mol) =

Answer:

A

Explanation:

Biology is the study of living things.

Answer:

The specific heat of the substance is 1.21 [tex]\frac{J}{g*C}[/tex]

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

There is a direct proportional relationship between heat and temperature. The constant of proportionality depends on the substance that constitutes the body as on its mass, and is the product of the specific heat by the mass of the body. So, the equation that allows calculating heat exchanges is:

Q = c*m*ΔT

where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

1108 J= c*83 g* 11 C

Solving:

[tex]c=\frac{1108 J}{83 g* 11 C}[/tex]

c= 1.21 [tex]\frac{J}{g*C}[/tex]

The specific heat of the substance is 1.21 [tex]\frac{J}{g*C}[/tex]

Answer:

A.

It contains three times as many hydrogen atoms as carbon atoms.

B.

It consists of 75% hydrogen by mass.

C.

Each molecule contains exactly four atoms.

D.

Each carbon atom is bonded to three hydrogen atoms.

Explanation:

it has 75% Hydrogen by mass

If we assume CH3 as 100% which is 4 parts.

Then 3 parts corresponds to Hydrogen which is 75% and remains is carbon,25 %

Answer:

Carbohydrates are energy-providing feed components composed of carbon, hydrogen, and oxygen. They should make up about 75 percent of an animal's diet. The energy they provide powers muscular movements. Carbohydrates also produce the body heat that helps keep the animal warm.

Answer:

team 25 N because the force is more

Answer:

it's D) catalyst speed up chemical reaction by increasing surface area

Explanation:

sorry if I'm wrong

Answer: 410

Explanation:

Drop the retaining numbers 1 and 2 after the decimal and then round the 2 in 412 to 0 because any number less than 5 rounds to 0. 0 shouldn’t count as a sig fig.

Answer:

The generic equation for a combustion reaction is AB + O2 à AO + BO

Explanation:

Answer:

62.50

Explanation:

I divided the 125 in the result is 62.50 but it is considered a 62.

never mine:)

[tex]125gms[/tex] of oxygen gas contains [tex]2.35\times 10^{24}[/tex] molecules of oxygen.

The molecular weight of oxygen[tex]=16[/tex]

Therefore,[tex]O_2=2\times 16\\=32[/tex]

No.of Moles of oxygen in 125g is,

[tex]\frac{125}{32}=3.9 g[/tex]

1mole of oxygen contains [tex]6.023\times10^23 molecules[/tex]

No.of oxygen molecules in 3.9 g of oxygen is,

[tex]3.9 \times 6.023 \times10^23=2.348 \times 10^24[/tex]

Which can be roundoff and written as [tex]2.35 \times10^{24}[/tex]

Therefore, 125gms of oxygen gas contains [tex]2.35 \times10^{24}[/tex] molecules of oxygen.

Learn More: https://brainly.com/question/25261193

Answer:

5

Explanation:

answer my last question plz

Answer:

put a test tube over the opening, remove it and quickly put a lit splint near the mout or in the tube. if you hear a squeaky pop it is hydrogen.

Explanation:

hydrogen ignites in air.

Answer:

ATP

Explanation:

ATP is the most abundant energy carrier molecule in cells.

basically nucleic acid

Answer:

I cant help you because you didn't provide a picture for the graph

Explanation: