Answers
Answer:
1. cells
2. energy
3. pre-existing cells by division
Explanation:
Answer:
1. All living things have 1 or more cell
2. All organisms use a source of energy
3. All cells come form other pre-exsisting cells
Explanation:
Related Questions
PLEASE HELP ME, 20 POINTS
How many atoms are in 25.00 g of Li.
Question 1 options:
2.393 x 1024 atoms of Li
1.333 x 1023 atoms of Li
2.16 x 1026 atoms of Li
2.17 x 1024 atoms of Li
How many grams is 2.393 x 1024 atoms of Cl
Question 2 options:
70.45 g Cl
140.9 g Cl
140.9 mole Cl
70.45 mole Cl
How many atoms are in 25.00 g of B.
Question 3 options:
1.393 x 1024 atoms of B
1.333 x 1023 atoms of B
2.16 x 1026 atoms of B
2.17 x 1024 atoms of B
How many grams is 2.393 x 1024 atoms of O
Question 4 options:
70.45 g O
140.9 g O
63.58 mole O
63.58 g O
Answers
Explanations:
Question 1: Lithium in 20.00+ g is C. or D., but 25.00+ g is D. which means this is the correct option.
I am unsure of Question 2. I don't think it is mole though.
Question 3: Boron in 25.00-30.00 g is B. or D., but 25.00 g would be C.
Question 4: 2.393 x 1024 atoms of Oxygen is 63.58 mole O. I don't know for sure, but I think this is correct.
I am NOT professional. There is a chance I am incorrect. Please reply to me if I've made a mistake.
stars evolve and change over time, what is something else on earth that changes over time? describe the similarities and differences
Answers
Answer:
Trees change over time.
Explanation:
In the summer, trees thrive on the nutrients the sunlight gives them. In the winter, their leaves change colors and they start to perish. Then, with a little bit of sunlight ad water, they can thrive again. Stars also start to perish at some point, but they do not thrive again. They continue perishing until they implode.
At certain times of year , the oceans get warmer. Which part of the water cycle is directly affected by the warming of the ocean water?
Answers
May God bless you and your family
What causes the biggest change mass or speed?
Answers
Answer:
Explanation if an object is in motion and more force is applied to it, the object will begin moving faster. If two objects have the same mass and a greater force is applied to one of the objects, the object which receives the greater force will change speeds more quickly.:
Answer:
i think that it is F
Explanation:
How many moles of CH3 are in 60 grams of CH3 ?
Answers
Answer: There are 3.99 .
Explanation:
A 170.0 g sample of an unidentified compound contains 29.84 g sodium, 67.49
g chromium, and 72.67 g oxygen. What is the compound's empirical formula?
Answers
The empirical formula : Na₂Cr₂O₇
Further explanationGiven
170 g sample contains :
29.84 g sodium, 67.49 g chromium, and 72.67 g oxygen
Required
The compound's empirical formula
Solution
mol ratio of elements :
Na : 29.84 : 23 g/mol = 1.297
Cr : 67.49 : 51,9961 g/mol = 1.297
O : 72.67 : 16 g/mol = 4.54
Divide by 1.297
Na : Cr : O = 1 : 1 : 3.5 = 2 : 2 : 7
how many moles are in 1.2 x 10^26 molecules of calcium hydroxide
Answers
Answer:
199.26 or with sig figs 2.0 x 10^2
Explanation: you take the # of molecules and divide it by avagadros number which is 6.022141 x 10^23
What does the large number in front of
the molecule represent?
Answers
Can someone help me please. This is the last day
Answers
Answer:
atomic nucleus :)
Explanation:
How many protons, neutrons, and electrons do the following elements have? Ca, Na, U, Yt
Answers
Answer:
Ca- 20,20,20
Na-11,12,11
U-92,146,92
i dont know what the last one is
Explanation:
Wastewater filtration
Pros and cons of secondary water filtration?
Answers
• Water filtration is cost effective, and it does not require a lot of money to maintain
•It is very easy and straightforward to use
Cons:
•Thorough cleaning and care of the equipment is very vital so that they can carry out the water softening process without any hitch whatsoever
“Sewage"; used water from a community (homes, businesses and industries, stormwater runoff)
Type
Pros
Cons
Pitcher
Low upfront cost; no installation needed.
Does not remove all contaminants; filters must be changed every couple of months and will increase the yearly cost of the filter system; filtration is slow.
Faucet/On the Counter
Relatively inexpensive; can switch between filtered and unfiltered water; easy to install; ideal for drinking and cooking water.
Faucet mounted may not fit on all faucets; decreases flow rate; filters are changed every couple of months.
On the counter may require some installation and can take up space; can sometimes be expensive.
Under-sink
Filter system is out of sight; infrequent filter changes; ideal for drinking and cooking water.
Requires installation; can sometimes be expensive; takes up cabinet space.
Whole House
Whole house kept clean from one system; various processes available; if system uses filters they are changed every couple of years.
Professionally installed; very expensive.
Reverse Osmosis
Removes most unwanted contaminants.
5-step process; filters replaced frequently; very expensive; wastes a lot of water.
Distillation
Removes heavy metals, fluorides and bacteria.
Not energy efficient; takes up a lot of space; very expensive.
Ultraviolet (UV)
Does not use heat or chemicals to remove contaminants.
Any color in water will prevent UV from working; sometimes filtration is necessary prior to UV; has a low effectiveness for removing chemicals.
Hope all these helps
is cellphone is made from renewable resources * true or false
Answers
Answer:
T
Explanation:
What is the relationship between a front and cloud formation?
Answers
Answer:
Weather fronts can cause clouds to form. Fronts occur when two large masses of air collide at the Earth's surface. Warm fronts produce clouds when warm air replaces cold air by sliding above it.
Explanation:
Which of the following best describes the movement of particles in a solid?
O A. Particles can vibrate slightly, but are unable to move around.
O B. Particles move past each other freely.
O C. Particles travel at high speeds in all directions.
O D. Particles travel at low speeds in all directions.
Answers
Answer:
A
Explanation:
particles are frozen and hence will vibrate in their fixed positions
How many moles of Na2SO4 are present in 426.12 grams of Na2SO4? (5 points)
Group of answer choices
2
3
5
6
Answers
Answer: It’s 2.9 moles
Explanation:
Answer:
b) 3
Explanation:
i got it right
Substance X is extremely acidic. Substance Y is extremely basic. What would be formed if substance X and Y were mixed together?
Answers
Answer:
salt will form bcz when acids reacts with base then it forms salts . and this reaction is called neutralization reaction
Learning Task 2: Fill in the blanks. Write your answers
Answers
How many atoms are in 4.5 x 1022 moles of CO2?
Answers
The number of atoms : N = 2.709 x 10⁴⁶
Further explanationGiven
4.5 x 10²² moles of CO₂
Required
The number of atoms
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
Input the value :
N = 4.5 x 10²² x 6.02 x 10²³
N = 2.709 x 10⁴⁶
Which state or states of matter have fixed volume but not a fixed shape?
Answers
Answer:
gas and liquid
Explanation:
A water molecule is held together by ___ covalent bonds,
meaning there are a total of __shared electrons in the
molecule.
Answers
2 covalent bonds
2 pairs or 4 electrons
PLEASE HELP ME!! CHEMISTRY
139. How many formula units are present in 500.0 g of lead (II) chloride?
Answers
Answer:
(500.0 g PbCl2) / (278.1164 g PbCl2/mol) × (6.022 × 10^23 f.u./mol) =
1.083 × 10^24 formula units
Explanation:
HURRY!!!! TIMED!!! WILL GIVE BRAINLIST!!!
A 10.0 g sample containing calcium carbonate (CaCO3) and an unreactive material was placed in excess hydrochloric acid, HCl. A reaction occurred, producing calcium chloride (CaCl2), water, and carbon dioxide. (a) write a balanced equation for the reaction (b) when the reaction was complete, 800 mL of carbon dioxide gas was collected. How many moles of calcium carbonate were used in the creation? (c) How many grams of CaCO3 were used? (d) If there was another contaminant in the sample that was not unreactive, would this have caused the percent yield of carbon dioxide to be higher, lower, or the same, explain your answer.
Answers
Explanation:
(a) write a balanced equation for the reaction
CaCO3 + HCl --> CaCl2 + H2O + CO2
The balanced equation is given as;
CaCO3 + 2HCl → CaCl2 + H2O + CO2
(b) when the reaction was complete, 800 mL of carbon dioxide gas was collected. How many moles of calcium carbonate were used in the creation?
From the balanced reaction;
1 mol of CaCO3 reacts to produce 1 mol of CO2
1 mol of CO2 = 22.4 L of CO2
This means;
1 mol of CaCO3 reacts to produce 22.4L of CO2
x mol would produce 800ml (0.8 L) of CO2
1 = 22.4
x = 0.8
x = 0.8 * 1 / 22.4 = 0.0357 mol
(c) How many grams of CaCO3 were used?
Mass = Number of moles * Molar mass
Molar mass of CaCO3 = 100.0869 g/mol
Mass = 0.0357 mol * 100.0869 g/mol = 3.57 g
(d) If there was another contaminant in the sample that was not un reactive, would this have caused the percent yield of carbon dioxide to be higher, lower, or the same, explain your answer.
The same
An un reactive contaminant in the sample is most likely a catalyst. Catalysts only affect the rate of reaction. They do not affect yields of products.
⚠️⚠️PLEASE HELPP⚠️⚠️
Describe an every day example of an object that has energy of motion and object that has stored energy
Answers
Answer:
Humans
Explanation:
Humans have energy of motion and store energy.
Every object will have any form of energy. For instance, when we are walking we gains a kinetic energy. We use electronic devices where electrical energy is stored and can be converted to mechanical energy to activate any motors.
What is energy transformation?Energy can neither be created nor be destroyed. However it can be transformed to any other forms. Thus, the total energy will conserved always.
We have a lot of example for energy transformation and storage. The energy form stored by virtue of the position of an object is called potential energy. Whereas, when the object starts moving potential energy converts to kinetic energy.
Thus, thermal vibrations of particles, our every day activities all are associated with a kinetic energy. Kinetic energy of each body depends on the mass and velocity of the body. The more the mass and velocity more will be the kinetic energy.
To find more on kinetic energy, refer here:
https://brainly.com/question/26472013
#SPJ5
A gas has an initial volume of 15L and the pressure is at 2atm. If the temperature increases from 330K to 462K and the pressure reduced to 1 ATM, what is the new volume of the gas?
Answers
Answer:
42L
Explanation:
Using the combined gas law equation as follows:
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the provided information in this question, P1 = 2atm, V1 = 15L, T1 = 330K, T2 = 462K, P2 = 1atm, V2 = ?
Using the formula;
P1V1/T1 = P2V2/T2
2 × 15/330 = 1 × V2/462
30/330 = V2/462
Cross multiply;
462 × 30 = 330 × V2
13860 = 330V2
V2 = 13860 ÷ 330
V2 = 42L
The new volume is 42L
Metals usually bend without breaking
while gems usually break in a specific pattern. What might be happening
to the bonds between the atoms in these materials that can explain this
difference?
Answers
We have that For a metal to metal metallic bond the atoms are arranged in a very compact manner ,This help for metals to move over each other in case of a bend.While gem atom don't same attribute.
From the question we are told
Metals usually bend without breaking
while gems usually break in a specific pattern. What might be happening
to the bonds between the atoms in these materials that can explain this
difference?
Generally
Metals are elements that form positive ionsMetals tend to engage in variant types of bondsFor a metal to metal metallic bond the atoms are arranged in a very compact manner This help for metals to move over each other in case of a bend.Hence, Metals don't break upon a bendGems, on the other hand break on impact be cause of the bonding between them.Most gems use an ionic bond for the bonding mechanism
For more information on this visit
https://brainly.com/question/1641336
How does the freezing point of a substance relate to its melting point?
Answers
Answer:
The melting temperature of a solid is generally considered to be the same as the freezing point of the corresponding liquid; because a liquid may freeze in different crystal systems and because impurities lower the freezing point, however, the actual freezing point may not be the same as the melting point.
#carryONlearningWhy don't we feel the air pressing on us all the time?
Answers
Answer: Why don't we feel the air pressing on us all the time?
Explanation:
Because air is a fluid, the weight of the air is transmitted to the palm of your hand and to the back of your hand at the same time. These forces cancel so that your hand overall feels no net force
Answer:the gravity in the atmosphere is pulling all the air so we can survive
Explanation:
3. How many moles of hydrogen atoms are present in 2.0 moles of ammonia
NH3?
A.3.0 mol
B. 6.0 mol
C. 8.0 mol
D. 2.0 mol
Answers
Answer:
3 I think
Explanation:
this could be because I noticed the 3 subscript by the H which is the letter for hydrogen but I'm not 100% sure
if I'm correct, then ur welcome <3 it's always nice to be nice UwU
here's Jay Jay for u cuz I love her ^^
which element group makes computers and calculators
Answers
In an exothermic reaction, the average kinetic energy of the particles of matter ib the products _____
1. decreases
2.stays the same
3. increases
Answers
Answer:
decreases
Explanation:
I'm hope it's correct
When there is an exothermic reaction so here the average kinetic energy of the particles of matter ib the products is option 1. decrease.
What is an exothermic reaction?In terms of thermochemistry, an exothermic reaction means the reaction where the total standard enthalpy should change so ΔH⚬ is negative. Also it should be release heat.
So based on this, When there is an exothermic reaction so here the average kinetic energy of the particles of matter ib the products is option 1. decrease.
Learn more about reaction here: https://brainly.com/question/18358257