7th grade help me plzzzzzzz

7th Grade Help Me Plzzzzzzz

Answers

Answer 1

Answer:

15 atoms

increases

Explanation:

10 hydrogen atoms + 5 oxygen atoms = 15 atoms


Related Questions

Meiosis occurs in
embryo cells
plant cells
reproductive cells
animal cell

Answers

Answer:

Meiosis is a type of cell division - like mitosis, but it results in four haploid cells with one-half the number of chromosomes as the original diploid cell. Meiosis occurs in plants only during sexual reproduction in specialized cells to produce a haploid egg cell.

Answer:

reproductive cells!

Explanation:

source: oddesyware:"So,how are egg and sperm cells created? The process of cell division in REPRODUCTIVE CELLS IS CALLED MEIOSIS." Hope this helps!

Isopentyl acetate is the molecule largely responsible for the aroma and taste of bananas. It is made up of carbon, hydrogen, and oxygen. Combustion of a 3.256-g sample of isopentyl acetate produces 7.706 g CO2 and 3.156 g H2O. Using these results, what is the correct empirical formula for isopentyl acetate?

Answers

Answer:

Explanation:

7.706 g of CO₂ will contain 12 x 7.706 / 44 g of C

= 2.1 g of C .

This will be contained in 3.256 g of isopentyl acetate

3.156 g of H₂O will contain 2 x 3.156 / 18 g of H

= .351 g of H

This will be contained in 3.256 g of isopentyl acetate

Rest will be oxygen

amount of oxygen in 3.256 g of isopentyl acetate

= 3.256 - ( 2.1 + .351 )

= .805 g

ratio of C , H , O in isopentyl acetate

= 2.1 g : .351 g : .805 g

2.1 / 12 : .351 / 1 : 0.805 / 16 ratio of moles

= .175 : .351 : .05  ratio of moles

= 3.5 : 7.02: 1

= 7 : 14 : 2

empirical formula of  isopentyl acetate

= C₇ H₁₄ O₂ .

To what pressure must a gas be compressed in order to get into a 3.00 cubic foot
tank the entire weight of a gas that occupies 400.0 cu. ft. at standard pressure?

Answers

Answer:

133.3atm

Explanation:

Given parameters:

Initial volume  = 400ft³

Final volume  = 3ft³

Initial pressure = 1atm

Unknown:

Final pressure  = ?

Solution:

To solve this problem, we  apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

  Mathematically;

               P₁V₁ = P₂V₂

P and V are pressure and volume

1 and 2 are initial and final states;

   Insert parameters and solve;

                1 x 400  = P₂ x 3

                     P₂  = 133.3atm

A Student notes that a chunk of wood is much lighter after it has been burned. He concludes that burning a substance destroyed some of the mass in that substance. Doi you agree or disagree explain why or why not.

Answers

Answer:

No.

Explanation:

When mass is destroyed, it has to have been transformed into something else. Otherwise that would violate the Law of Conversion of Mass. In this case, the wood converted some of its mass in chemical energy to thermal (or heat) energy.

24H2S + 16HNO3 3Sg+ 16NO + 32H2O

Answers

Answer:

24 sultur with 48hydrogen+16 hydrogen,nitrogen and 48 oxygen+16 nitrogen,16 oxygen+62hydrogen and 32 oxygen

Explanation:

carbon + oxygen -->
carbon dioxide
balancing equation

Answers

Carbon = C

Oxygen = O

CO2 = Carbondioxide

Balanced equation :

C + O2 = CO2

Answer:

co2

Explanation:

c+o2-------------> co2

Which family of elements has six electrons in d-type orbitals?

Answers

Answer: Selenium is a member of the sulfur family with elements including tellurium and polonium. This family has six electrons in the outermost shell. Selenium specifically has an electron configuration of 2-8-18-6. The six electrons in the outermost shell allow selenium to have a variety of valence numbers.

Explanation:

8.
Blank is the transfer of energy by electromagnetic waves.
Your answer

Answers

electromagnetic radiation.




what information can you figure out about an atom using only the atomic number?​

Answers

the number of protons
The number of atoms

scientists studying squirrels in a forest observed that the squirrel population decrease over a period of five years. which statement is the most likely explanation for the decrease in the population?​

Answers

Answer:

1.An increment of predators

2.unavailability of food resources due to change in climate causing famine

3.Spread of diseases over time that might kill the squirrels

4.An increment of squirrels which caused high competition on food,thus some of them had to migrate

5.Might be fire break out over some time that caused death to some squirrels in the reasoning of the period of time

why do the Noble gases have the highest ionization energies across a period?

Answers

Answer:

ionization energy decreases from top to bottom in groups, and increases from left to right across a period. So technically, the noble games have the largest ionization energy.

Explanation:

What is true about atoms when they bond? There may be more than one answer.

1. Bonded atoms can never be taken apart

2. Electrons can be transferred

3. They form compounds

4. Compounds have the same characteristics are the atoms that make it up

5. Electrons can be shared

Answers

Answer:

3. 5. and i think thats it

Answer:

3. 5. and i know it is right

Explanation:

If a net force of 4 N caused a football to accelerate 8 m/s2 across a football field, what was the mass of the football?

Answers

Answer:

Mass is .5kg

Explanation:

F=ma, plug in your numbers:

F=4N

A=8m/s^2

4=m8

m=4/8

How do the data support your claim above? Explain your statement above.

Answers

Answer:

the data will support my theory if the results are right for my hypothisis

Answer:

That guys answer is right i'll be trying my best to answer as much wrong in correct answers if wrong i will correct them

Explanation:

sorry i couldn't help theres over more then 200,000 people who uses brainy

help!!!!?????????? plssssssss

Answers

Answer: it’s b)

Explanation: that’s the only difference that is listed

Answer:

I think it is B

Explanation:

PLS HELP ME PLS I'LL GIVE BRAINLIEST TO WHOEVER ANSWERS FIRST OR HAS THE BEST ANSWER

Answers

different consistency’s and or property’s if I remember correctly

Which type of bond is salt? a. covalent b. valence c. metallic d. ionic

Answers

Answer:

D. Ionic

Explanation:

It has ionic bonding! Good luck ^^

What is the specific heat of a substance that absorbs 1000 joules of heat when a sample of 25 g of the substance increases in temperature from 10.0C to 60.0C

Answers

Answer:

1250000

Explanation:

Specific heat is mass times specific heat capacity times change in temperature to get chance in temperature minus the old temperature from the new temperature then complete equation hence 25g×1000j×(60-10)

25g×1000j×50

=1250000g/j/degree Celsius

HELP ASAPPPP

Cobalt-60 has a half-life of 5.3 years. A sample measures 0.95g of cobalt-
60. If the sample originally had 5.2g of colbalt-60, determine its age in
years or the time elapsed in years. Round up answer in the nearest whole
number and no additional text or unit. *

Answers

Answer:

13 years

Explanation:

From;

0.693/t1/2 = 2.303/t log (No/N)

Where;

t1/12 = half-life of Cobalt-60 = 5.3 years

t = time taken = the unknown

No = mass of radioactive material originally present = 5.2 g

N = mass of radioactive material at time t = 0.95 g

Substituting values;

0.693/5.3 = 2.303/t log (5.2/0.95)

0.131 = 2.303/t(0.738)

0.131 = 1.6996/t

t =  1.6996/0.131

t = 12.97 years

t = 13 years(to the nearest whole number)

Why can gases be compressed easier than liquids and solids?
F.
Gases have smaller atomic nuclei than solids and liquids.
G.
Solid materials go through chemical changes when they are compressed.
H.
The electron clouds in atoms of solids and liquids are much larger.
J. The space between gas molecules is bigger than solid and liquid molecules.

Answers

Answer:

J

Explanation:

In photosynthesis, what are the polar molecules?

Answers

Answer:

in photosynthesis polar molecules are molecules that have a diffrent arangment in molecules for example polar water molecule is when oxegen is on one end and the hydrogen is on the other. olmost any compound can have a polar or non polar molecule.

Explanation:

What is the charge of this atom?
65 protons
60 electrons

A)-5
B)+5
C)0

Answers

Answer:

B. +5

Explanation:

B is the answer to your ?????? C

I have the coldest temperature of the atmosphere. Who am I?

Answers

Answer:

Jack Frost of course!!!!!!!

Could cellular respiration
happen without photosynthesis? Explain your
reasoning

Answers

Answer:

No

Explanation:

Without photosynthesis, there would be no sugar, without which there could be no cellular respiration.Both animal cells and plant cells depend on cellular respiration for their energy needs, because both animal cells and plant cells need ATP.

what are green boxes on periodic tables

Answers

Answer:

The basic metal ones?

Explanation:

...

A year has 365 days, and a day has 24 hours. If an hour has 60 minutes and a minute has 60 seconds, how many seconds are there in 1 year?

54,750 s
525,600 s
3.15 Times. 107 s
1.89 Times. 109 s

Answers

Answer:

31,536,000 seconds

Explanation:

off google

Answer:

3.15 x 10^7s

Explanation:

what is the formula for dihydrogen tetraoxide

Answers

It's been a while... but I'm pretty sure it's

H₂O₄

Suppose that green spheres represent chlorine atoms, yellow-green spheres represent fluorine atoms, white spheres represent hydrogen atoms, and all the molecules are gases

Answers

Answer:

a. Reactants: F₂ and HCl molecules

Products: Cl₂ and HF

b. 4HCl + 2F₂ ----> 4HF + 2Cl₂

c. Single replacement reaction

Note: The question is not complete. The complete question is found below as well as in the attachment.

Suppose that green spheres represent chlorine atoms, yellow-green spheres represent fluorine atoms, white spheres represent hydrogen atoms, and all the molecules are gases:

a. write a formula for each of the reactants

b. write a balanced equation for the reaction

c. indicate the type of reaction as combination,decomposition, single replacement, double replacement, or combustion

Explanation:

a. From the models shown in the diagram, The reactants are F₂, HCl while the products are Cl₂ and HF respectively

b. Equation for the reaction is given below;

4HCl + 2F₂ ----> 4HF + 2Cl₂

c. The reaction is single replacement reaction such that fluorine gas molecules replace the chlorine atoms in hydrogen chloride to form hydrogen fluoride with the liberation of chlorine atoms as gaseous molecules.

who know how to do this thank you

Answers

Number of neutrons :

Argon=22

Boron=6

Further explanation

There are two components that accompany an element, the mass number and atomic number

Atoms are composed of 3 types of basic particles (subatomic particles): protons, electrons, and neutrons

The Atomic Number (Z) indicates the number of protons and electrons in an atom of an element.

Atomic number = number of protons = number of electrons ⇒ neutral number

Atomic mass is the sum of protons and neutrons

Atomic Number (Z) = Atomic mass (A) - Number of Neutrons

Argon has an atomic number of 18 and a mass number of 39,948

number of neutrons =

[tex]\tt 39.948-18=21,948\approx 22[/tex]

Boron has an atomic number of 5 and a mass number of 10,811

number of neutrons =

[tex]\tt 10.811-5=5.811\approx 6[/tex]

The density of water is 1.00 g/mL. Which substance below can float on water?

Answers

Answer:

ice, air, ducks and fabric

Explanation:

its common sense

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