Chemistry High School

i need help !! pls answer this is due in like 30 minutes!!

Answers

Answer 1

20000 nanograms sorry i cant answer the second question

Related Questions

Which statement best explains a way in which a cell gets rid of wastes?

Answers

Answer:

I would say B but you don't have to take my word for it

Answer:

Explanation:

Why do surface waves break along the shore?

Answers

As waves reach the shore, the energy in front of the wave slows down due to friction with the shallow bottom. ... The wave breaks, and it usually does so in water depth that is 1.3 times the wave height.

Answer:

because the global sea level rises while the poles temperature increases

Explanation:

When energy is released by the pack, what happens to the energy of the surroundings (outside the pack)?
a. The energy increases
b. The energy decreases
c. The energy stays the same

Answers

Answer:

Explanation:

i hope that's correct

The energy of the surroundings (outside the pack) will:

a. The energy increases, when energy is released.

Energy in the surroundings:

Energy is delivered to create bonds, which is the reason the enthalpy change for it is positive to break bonds. Energy is expected to break bonds. Particles are a lot more joyful when they are "wedded" and discharge energy since it is simpler and more steady to be seeing someone.

When energy is released, the energy in the surroundings will increase.

Thus, option a is correct.

Find more information about Energy here:

brainly.com/question/25959744

What is a function of the backbone in animals?
A. It protects against predators.
B. It regulates blood glucose.
C. It surround the spinal cord.
D. It limits movement.

Answers

Answer:

C - It surrounds the spinal cord.

Explanation:

Option A would be incorrect. Having a protective shell on an animal’s back would be one of the ways they would be protected against predators. And having a backbone wouldn’t really make a good shield against predators.

Option B is incorrect. The pancreas regulates blood glucose, not the backbone.

Option D would also be incorrect. It doesn’t limit movement unless it’s bent or positioned abnormally. Or unless it’s broken or malfunctioned.

The only option that is correct is option C. Hope it helps. ^^

Is a large body of flowing water ;created by many smaller flowing together. Aquifer

Answers

Answer:

alll I really know is that it includes smaller pools of water

Since I'm a tomboy, does that mean I'm gender non-conforming?

Answers

i guess so? ur basically just breaking gender roles/ stereotypes. do what makes u happy :p

Answer:

Hello

Explanation:

I am a girl,not a tomboy.

Will we talk about something?

Help only if you know the answer

Answers

Answer:

velocity

Explanation:

Question 1 of 10
What do biologists study?
A. Living things
B. The properties of light
C. The properties of matter
D. How matter and energy interact
SUBMIT

Answers

Answer:

Explanation:

Biology is the study of living things.

What is the number of moles of 60.7 liters of oxygen molecules?

Answers

Answer:

2.17 moles of gas.

Explanation:

in the reaction :N2 + 3H2----2NH3 how many grams of H2 are needed to produce 1 mole on ammonia

Answers

Start with moles of ammonia you want to produce, then convert to how many moles of H2 you need to get one mole of ammonia, then convert that to grams :)

The number of grams that are needed to produce 1 mole on ammonia is to be considered as the 1.52 g Hz.

Calculation of the number of grams:

Here we begins the moles of ammonia for production after this it convert the number of moles of h2 for getting one mole of ammonia and then finally convert into grams

So it be like

[tex]= 1\ mol NH_3 \frac{3H_2}{2NH_3}\frac{1.01g }{1\ mol H_2}[/tex]

= 1.52 g Hz

Hence, The number of grams that are needed to produce 1 mole on ammonia is to be considered as the 1.52 g Hz.

Learn more about grams here: https://brainly.com/question/10822689

1 point
2. Due to its intricate network, minerals with sheet of tetrahedron do not
easily separate. *
True
False

Answers

I’m pretty sure it’s true :))!!

10. Which of these elements is the most electronetative?
(10 Points)
Nitrogen
Calcium
Bromine
O Aluminum

Answers

it would be nitrogen

Out of the four Nitrogen is the most electronegative. Electronegative is basically determined by whichever atom is closest to F (the most electronegative)

Nitrogen is only a few electrons difference than Fluorine. Bromine is still quite electronegative but it has whole extra valence shells making it not as electronegative as nitrogen

Help PLs thnk you!!!!!!!!!!!!!!!!!!!!!!!!

Answers

The answer is A is the correct answer

Explain why the elements in group 7 have 7
valence electrons.

Answers

Answer:

The periodic table was made that way by the scientists who created it

Explanation:

to make things easier for the users.

How do you know when a redox equation is balanced?

Answers

Like to check? Just add up the charges on both sides and see if they equal each other:)

Please help me i really need help

Answers

Answer:

H2o i think

Explanation:

How many grams of Sn will be created when 114 grams of SnO2 react with excess H2? SnO2 + H2 ->Sn + H2O
I

Answers

Explanation:

CNN vfbtgnynynynynyuybunujy

How many atoms of tin are found in 3.50 moles of tin?

Answers

Answer:

2.11x10²⁴ atoms

2. When two oppositely charged particles are brought near each other, they produce a torceted the stone
shows the force around two changed particles
Which force do the arrows represent?
A an unbalanced force
B. a frictional force
C.an electrical force
D.a gravitational force

Answers

Answer:

Explanation:

An unbalanced force is your answer.

find the moler mass of P2S3

Answers

Answer:

158.2 g/mol

Explanation:

Which layer over time due to chemical and physical weathering leads to the other layers?

Answers

Answer:

chemical weathering occurs on the surface of minerals, the water and acids that control chemical weathering require access to the surface. Physical weathering breaks the rock to provide that surface

How much energy is needed to heat 9.3 grams of silver metal from 21 °C to 52 °C, if the
specific heat of silver metal is 0.240 J/g °C?
Question 5
4 pts
How much heat must be added if 160 grams of water is heated from 24 °C to 85 °C?
(The specific heat of water is 4.184 J/g °C)

Look at picture
ASAP please will mark as brainlist don’t got much time

Answers

Answer:

question 4. 69.19J

question 5. 40835.84J

Explanation:

question4.

heat needed = mass × specific heat capacity × change in temperature

= 9.3× 0.240×(52-21)

=69.192J

question 5.

heat added = 160× 4.184×(85-24)

= 40835.84J

To prepare 800mL of 1M phosphate buffer of pH 7.2 (PKa=7.1), by using salt = K2HPO4 and acid = KH2PO4, the quantity of salt required is

Answers

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) =

78.04g of 0.448 moles must be added

How to convert 1348celsius to kelvin in stoichiometry reaction of a gas. The gas turned white not green.

Answers

Answer:

1621 K

Explanation:

How to convert 1348 celsius to kelvin

Celsius and Kelvin are both units for temperature. The relationship between both units is given as;

Kelvin (K) = Celsius ( °C ) + 273

Inserting the values from the question;

Kelvin (K) = 1348 + 273 = 1621 K

What human actions contributed to the nutrient pollution of Lake Okeechobee?
PLZ HELP MEEEEEEEEEEEEEEEE I BEG YOU

Answers

Answer:

These trends were attributed to both the increased external loads and to a reduction in the lake sediment's ability to assimilate nutrients from the water column. The main sources of external nutrient inputs are animal waste and fertilizers applied to food and forage crops.

Venus is the second planet from the Sun. It takes about 225 days for it to complete one revolution. What would make Venus have a longer revolution?

if Venus rotated slower

if Venus were closer to the Sun

if Venus rotated faster

if Venus were farther away from the Sun

Answers

Answer:

if venus were farther away from the sun

Explanation:

it is because far the planet is long the orbit is which make revolution longer

Identify what type of reaction is this
2AgCl + H2 → 2Ag + 2HCI

Answers

Answer:

single displacement

Explanation:

Can somebody please draw a mechanism for this reaction (synthesis of varenicline)?

Answers

Answer:

that is kinda hard I need to serch it up hold on

What do atoms consist of?

Answers

Answer:

protons, neutrons, electrons

Answer:

Atoms consist of 3 particals:Protons,Neutrons,and Electrons

Arrange the following atoms in order of decreasing atomic radius

Answers

Answer:

............. ..

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