Which statements correctly describe characteristics of cells? Check all that apply. A. Animal cells are all generally circular in shape.
B. Plant cells come in many different shapes and sizes.
C. Only animal cells have a nucleus.
D. Bacterial cells are smaller than animal or plant cells.
E. Most cells within a living organism are alive.​

Answer:

b

Explanation:

Answer:

The basic metal ones?

Explanation:

...

Number of neutrons :

Argon=22

Boron=6

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]

Answer:

Mass is .5kg

Explanation:

F=ma, plug in your numbers:

F=4N

A=8m/s^2

4=m8

m=4/8

Answer:

B. +5

Explanation:

Answer:

nonmetel

Explanation:

Answer:

Its a non-metal

Explanation:

Elements that tend to gain electrons to form anions during chemical reactions are called non-metals. These are electronegative elements. They are non-lustrous, brittle and poor conductors of heat and electricity (except graphite). Non-metals can be gaseous, liquids or solids.

Answer:

D. Reactants.

Explanation:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

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

Answer:

Jack Frost of course!!!!!!!

Answer:

3. 5. and i think thats it

Answer:

3. 5. and i know it is right

Explanation:

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:

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.

Answer:

ice, air, ducks and fabric

Explanation:

its common sense

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 .

Answer:

The Kinetic energy decreases

Explanation:

because the speed of the molecules slows down.

Answer:

D. Ionic

Explanation:

It has ionic bonding! Good luck ^^

Answer: it’s b)

Explanation: that’s the only difference that is listed

Answer:

I think it is B

Explanation:

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

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)

Explanation:

The first step in this problem is to convert the wavelength, λ, to a frequency, ν, and

then calculate the energy of the photon using ε = hν. In such problems you must take

care to use a consistent set of units. We will use S.I. units. Thus,

λ = 18900 Å = 18900 x 10–10 m = 1.89 x 10–6 m

The frequency associated with this wavelength is given by:

ν = c/λ = (3.00 x 108 m s–1 ) / (1.89 x 10–6 m) = 1.59 x 1014 s–1

The energy ε associated with a photon of this frequency is:

ε = h ν = (6.626 x 10–34 J s) (1.59 x 1014 s–1) = 1.05 x 10–19 J

Note -- the ENERGY of this photon corresponds to a DIFFERENCE between

energy levels of the H atom

The energy levels for the H atom are given by:

εn = (–21.8 x 10–19 J) / n2 ; where n = 1,2,3,4,.............

Thus, ε1 = –21.8 x 10–19 J; ε2 = –5.45 x 10–19 J

ε3 = –2.42 x 10–19 J; ε4 = –1.36 x 10–19 J

We now seek an ENERGY LEVEL DIFFERENCE which matches the energy of the

photon.

We see that the electronic transition which gives rise to an EMITTED photon with

energy ε = 1.05 x 10–19 J is:

ninitial = 4 → nfinal = 3

2. A series of spectral lines in emission is characterized by a common value of nfinal -- i.e.

the quantum number of the level at which the transition terminates. Since the 18900 Å

line arises from a transition in which ninitial = 4 and nfinal = 3, the series to which it

belongs is characterized by nfinal = 3. The series limit for this series of emission lines is

the wavelength that would correspond to the transition ninitial = ∞ to nfinal = 3

From the energy level expression given in problem1 we see that:

ε∞ = (–21.8 x 10–19 J) (1/ ∞2) = 0

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.

Answer:

a. 53.3°C.

b.  Percent error for both students is 53.3°C

c. Both students are equal in accuracy.

2nd student is most precise

Explanation:

The percent error is defined as:

|M - T| / T * 100

Where M is measurement,

and T is theoretical value

a. To obtain the average of both measurements we need to sum the measurements and divide these in the number of measurements:

51.5°C+53.5°C+55.0°C+52.3°C+54.2°C+52.3°C+53.2°C+54.0°C+53.5°C / 9

= 53.3°C

b. Percent error for 1st student:

51.5°C+53.5°C+55.0°C+52.3°C+54.2°C / 5 = 53.3°C

|53.3°C - 53.0°C| / 53°C * 100

0.57%

Percent error for 2nd student:

52.3°C+53.2°C+54.0°C+53.5°C / 4 = 53.3°C

|53.3°C - 53.0°C| / 53°C * 100

0.57%

c. Now, precision is how close are the measurements to each other and the accuracy how close are the measurements to the theoretical value:

The accuracy is obtained with percent error, the lower percent error the most accurate measurement. That means:

both students are equal in accuracy.

And precision is obtained with relative standard desviation.

Desviation standard / Average * 100

(We can solve the standard desviation in a scientific calculator):

1st student:

2.65%

2nd student:

1.34%

The lower RSD the most precise measurements.

Carbon = C

Oxygen = O

CO2 = Carbondioxide

Balanced equation :

C + O2 = CO2

Answer:

co2

Explanation:

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

Answer:

31,536,000 seconds

Explanation:

off google

Answer:

3.15 x 10^7s

Explanation:

Answer:

use the meaning of the word see what is similar and what is different about them