Select all the correct answers.
What are the characteristics of prokaryotes?
A prokaryote lacks a well-defined nucleus.
A prokaryote cannot perform basic life functions.
A prokaryote lacks cell organelles.
A prokaryote is larger than a eukaryote.
eu vou colocar V(verdadeiro) F (falso)
1:F
2:F
3: V
4:F
explicação:
1 procariontes não apresentam núcleo
2 eles podem sim caso contrário os seres procariontes não sobreviveriam
3 ele possui organelas celulares
4 as células eucariontes são maiores e mais complexas.
CONCLUSÃO: a resposta certa é a 3
Why do other elements need to bond with one another?
Answer:
Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it.
Answer:
In order for that element to gain stability
6. Convert a measurement of 18 cm to its equivalent in m.
7.
Convert a measurement of 75 mL to its equivalent in L.
HELPP?!???!!
Answer:
0.18m
0.075L
Explanation:
1m = 100cm
18cm = 18/100 = 0.18m
1L = 1000mL
75mL = 75/1000 = 0.075L
If my answer is incorrect, pls correct me!
If you like my answer and explanation, mark me as brainliest!
-Chetan K
what is the oxidation number of chloride ion HClO ?
The oxidation state of Cl is +1
how to find the number of electrons not in a neutral atoms ?
Answer:
To determine how many total electrons there are, add the amount of charge to the atomic number
Explanation:
For example, N3- has a -3 charge which means it has 3 more electrons than a neutral nitrogen atom. Nitrogen's atomic number is 7, therefore this ion has 10 electrons.
Which of the following are exact numbers? (Check all that apply.)
1000 meters in one kilometer.
The diameter of a coin, 10.2756mm (millimeters)
A dozen eggs.
16 ounces in 1 pound.
The length of a pen, 12mm (millimeters)
For the given options we found that the following are examples of exact numbers:
1000 meters in one kilometer is an exact numberA dozen eggs is an exact number. 16 ounces in 1 pound is an exact number.To find which of the given examples are exact numbers, we need to recall its definition. In simple words, an exact number is a number that can be counted without uncertainties, usually is an integer one.
A number that is determined with uncertainties with a finite number of significant digits or thought an instrument is not an exact number (is a measured one).
Now, let's evaluate each option.
a) 1000 meters in one kilometer
This is an exact number because we know for certain that in 1 kilometer there are 1000 meters. All the conversion of units like meters to kilometers, grams to kilograms are examples of exact numbers.
b) The diameter of a coin, 10.2756 mm
This is not an exact number, because the diameter found has a finite number of significant digits, which means that the measurement has an uncertainty in the final decimal position. Also, this diameter was found with an instrument.
c) A dozen eggs
A dozen is a number that can be counted with certainty, so it is an exact number.
d) 16 ounces in 1 pound
This is like example "a". Since we know for sure that in 1 pound we have 16 ounces, this is an exact number.
e) The length of a pen, 12 mm
Although the number 12 mm is an integer, this is not an exact number because this dimension was measured. We do not know for sure that the dimension of a pencil is 12 mm, we can not count it.
Find more about exact numbers here: https://brainly.com/question/14741425?referrer=searchResults
I hope it helps you!
Which element does not have the same number of electrons in its outermost shell as the other elements in its group?(1 point)
hydrogen (H)
boron (B)
helium (He)
bromine (Br)
Answer:
Helium
Explanation:
The element that does not have the same number of electrons in its outermost shell as the other elements in its group is helium. The correct option is C.
What is helium?Helium is a gas and the second element of the periodic table. It has an atomic number of 2. It is a colorless, odorless, and non-toxic gas. Furthermore, it is the lightest gas, and it is used in filling in the tires of airplanes and balloons.
The group in which helium is present in group 18. It contains 6 elements. Helium is the first element. All element in the periodic table has eight electrons in their last shell. But only helium has 2 electrons in its outer valence. So, helium is different from other elements present in its group.
Thus, the correct option is C. helium (He).
To learn more about helium, refer to the link:
https://brainly.com/question/11993868
#SPJ6
89. The element bromine at room temperature is a liquid with a
density of 3.12 g/mL. Calculate the mass of 125 mL of bro-
mine. What volume does 85.0 g of bromine occupy?
The mass of 125 mL of bromine and the volume occupied by 85 g of bromine are:
1. The mass of bromine is 390 g. 2. The volume of bromine is 27.24 mL.Density is simply defined as the mass of an object per unit volume of the object. It can be expressed mathematically as
[tex]Density = \frac{mass}{volume }[/tex]
1. Determination of the mass of bromineDensity = 3.12 g/mL
Volume = 125 mL
Mass =?[tex]Density = \frac{mass}{volume} \\\\3.12 = \frac{mass}{125}[/tex]
Cross multiply
Mass = 3.12 × 125
Mass = 390 gTherefore, the mass of bromine is 390 g
2. Determination of the volume of bromineDensity = 3.12 g/mL
Mass = 85 g
Volume =?[tex]Density = \frac{mass}{volume } \\\\3.12 = \frac{85}{volume }[/tex]
Cross multiply
3.12 × Volume = 85
Divide both side by 3.12
[tex]Volume = \frac{85}{3.12}\\\\[/tex]
Volume = 27.24 mLTherefore, the Volume of bromine is 27.24 mL
Learn more: https://brainly.com/question/24460125
Weight is the measure of what
Answer:
weight is the measure of force put onto an object
like if you put a heavier object on something elastic, it would go lower because weight creates force and friction
Einstein also said that gravity can affect not just mass but...
A.nothing else, just mass.
B.light waves or energy
C.everything.
Answer:
B. Light waves or energy
Explanation:
Einstein argued that gravity isn't a force at all. He described it as a curvature of time and space caused by mass and energy.
PLZ MARK ME BRAINLIEST.
Al saltar una persona del Bungee se observa que las cuerdas con las que se sujeta muestran un
grado de estiramiento por el peso y la velocidad que alcanza, una vez que ya no hay movimiento,
las cuerdas retoman su forma original. ¿Qué propiedad física se presenta?
La propiedad física es la elasticidad.
La elasticidad es la capacidad de un material para extenderse cuando está bajo la acción de una fuerza de estiramiento y volver a su forma original cuando se elimina la fuerza de estiramiento.
Cuando la persona que salta sostiene el bungee, se encuentra que se estira y vuelve a su forma original cuando no hay más movimiento. El bungee puede considerarse elástico.
Este es un ejemplo de la propiedad física llamada elasticidad.
Aprende más: https://brainly.com/question/1282889
4. Select the measurement that is consistent with the uncertainty of each instrument.
(a) METRIC RULER A: 10 cm, 10.0 cm, 10.00 cm
(b) METRIC RULER B: 10 cm, 10.0 cm, 10.00 cm
(c) decigram balance: 10.0 g, 10.00 g, 10.000 g
(d) centigram balance: 10.0 g, 10.00 g, 10.000 g
(e) milligram balance: 10.0 g, 10.00 g, 10.000 g
(f) graduated cylinder: 10 mL, 10.0 mL, 10.00 mL
(g) Celsius thermometer: 10 °C, 10.0 °C, 10.00 °C
The correct measurements has an uncertainty of ±0.01.
What is the metric system?The metric system of measurement is a system of measurement that makes use of the meter, litre and gram as units. With every measurement, there is a level of uncertainty.
The uncertainly that goes with each measurement usually lies between ±0.01. Hence the correct measurements has an uncertainty of ±0.01.
Learn more about metric system: https://brainly.com/question/25966695
Calculate the number of kilograms of sodium fluoride needed per year for a city of 100,000 people if the daily consumption of water per person is 150.0 gallons.
Fluoridation is the process of adding fluorine to drinking water to avoid tooth decay.
The question is incomplete; the complete question is;
Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons.
(Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon = 3.79 L; 1 year = 365 days; 1 ton = 2000 lb; I lb = 453.6 g; density of water = 1.0 g/mL.)
The quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons is [tex]9.32 * 10^9 Kg[/tex].
From the question, we know that;
Daily consumption of water per person = 150 gallons.
Population of the city = 100,000 people
Total daily city consumption =[tex]100,000 * 150 gallons = 15 * 10^6 gallons[/tex]
Annual water consumption = [tex]15 * 10^6 gallons * 365 = 5.475 * 10^9 gallons[/tex]
1 gallon = 3.785 L = 3.785 kg
[tex]5.475 * 10^9 gallons = 5.475 * 10^9 gallons * 3.785 kg/ 1 gallon = 2.1 * 10^10 Kg[/tex]
Since sodium fluoride accounts for 45% by mass of water
Mass of sodium fluoride= [tex]0.45 * 2.1 * 10^10 Kg= 9.32 * 10^9 Kg[/tex]
Learn more; https://brainly.com/question/14805580
50 POINTS!!!! What is the approximate amount of the leftover reactant?
O 8.2 g of sulfuric acid
O 9.8 g of sulfuric acid
0 11.43 g of aluminum hydroxide
O 13.76 g of aluminum hydroxide
Answers: The answer is A
Explanation:
correct me if I'm wrong
Ammonium carbonate solution is added to dilute nitric acid. What is the balanced chemical equation?
Help please! I’m not sure if metal b has higher density then a & I don’t know the other questions without that information.
Answer:
How would you set this up?
Explanation:
is Isoheptenes hazardous when wet
Answer:
yes it is dangerous
Explanation:
Water reactive substances are dangerous when wet because they undergo a chemical reaction with water.
Would overheating be a stimulus or a
response?
Stimulus
Response
Answer:
stimulus response
Explanation:
its stimulus response
6.Observe the equation below 2 Fe2O3(s) + CO(g) Fe(s) + CO2(g)
i) Balance the equation
Answer:
the given equation is
Fe2o3+co-- Fe+co2
Balanced chemical equation is
Fe2o3 + 3co-- 2Fe+3co2
A metal has a density of 11.3 g/cm^3..
Answer:
2.2309
Explanation:
Density=Mass÷Volume
Volume=mass÷Volume
=23.210÷11.3
=2.2309
What is an atomic number
Answer:
the number of protons in the nucleus of an atom, which is characteristic of a chemical element and determines its place on the periodic table
How is scientific observation done properly and safely using laboratory equipment?
Does anyone know the name of Platinum +1 and Sulfur? Like the compound name?
Carry out the following conversions. Report your answers to the correct number of significant
figures.
(a) 75 cm to ft
ft
(b) 0.668 kg to lb
Ib
(e) 0.549 uL to qt
* 10-qt
(d) 9,991 mm to km
9.991 x 10 (select)
km
(e) 313 nm to mm
3.13 x 10 (select)
mm
(1) 7 ft to cm
* 102 cm
We want to perform some changes of units, such that the number of significant figures (the ones different than zero) does not change.
a) 75 cm to ft
We know that:
1ft = 30.48cm
1 = (1ft)/(30.48cm)
Now, remember that if we multiply a quantity by one we do not affect the quantity, so we can write:
75cm = 75cm*(1ft)/(30.48cm) = 2.5 ft
b) 0.668 kg to lb
we know that:
1kg = 2.20462 lb
then:
1 = (2.20462 lb)/(1kg)
0.668 kg = 0.668 kg*(2.20462 lb)/(1kg) = 1.47 lb
c) 0.549 uL to qt
We know that:
1 uL = 3.437*10^-9 qt
1 = (3.437*10^-9 qt)/(1 uL)
Then:
0.549 uL = 0.549 uL*(3.437*10^-9 qt)/(1 uL) = 1.91*10^-9 qt
d) 9.991 mm to km
we know that:
1mm = 1*10^-6 km
then:
1 = (1*10^-6 km)/(1mm)
So we can rewrite:
9.991 mm = 9.991 mm*(1*10^-6 km)/(1mm) = 9.991*10^-6 km
e) 313 nm to mm
We have:
1nm = 1*10^-6 mm
1 = ( 1*10^-6 mm)/(1 nm)
Then:
313 nm*( 1*10^-6 mm)/(1 nm) = 3.13*10^-4 mm
If you want to learn more, you can read:
https://brainly.com/question/24606249
Identify all the signs of a chemical change in the description below:
A clear liquid is placed in a beaker and heated. As the liquid is heated, bubbles form and, gradually, the liquid decreases in the container.
Answer:
When a substance undergoes changes in its chemical composition or combines with another substance to form a new substance is referred to as chemical change. In contrast, physical change is defined as the change in appearance or state of matter and not the chemical composition of the substance.
Explanation:
When a clear liquid is boiled or heated, the kinetic energy of the molecules increases, and the evaporation of the liquid takes place faster. For example, evaporation is a type of physical change, in which the liquid is heated to form bubbles or vapors. These vapors rise in the air and decrease the volume of the liquid. In this process, the liquid has only changed its state of matter (liquid to gas) and not the chemical composition. Thus, there is no chemical change taking place in the heating of water and only physical change is taking place.
Someone help answer this for me tysm
Answer:
Energy, Kinetic, Potential
Explanation:
Kinetic and Potential is energy
Kinetic is energy in motion and Potential is stored motion.
Sublimation cannot be used to separate a mixture of salt and sand.Give reason.
Answer:
because salt cannot be changed into gas by heating.
Answer:
Sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase. Explanation: sand and salt can not be separated through the method of sublimation because none of the two can show sublimation(even when heated).
Explanation:
What is photosynthesis ?
[tex] \huge \boxed{\mathfrak{Question} \downarrow}[/tex]
What's photosynthesis?[tex] \large \boxed{\mathfrak{Answer \: with \: Explanation} \downarrow}[/tex]
Photosynthesis is the process in which green plants derive their food (nutrients and water) through the capturing of light energy (sunlight) and using it to convert carbon dioxide (CO2) and water (H2O) into oxygen (O2) and other substances (compounds) that are rich in energy. Chlorophyll a green pigment present in plants is used in this process.
__________________
Formula ⟶ [tex]\boxed{\bf\:6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2} [/tex]
__________________
So, the products of photosynthesis are [tex]\large\boxed{\boxed{\bf\:C_6H_{12}O_6 + 6O_2}}[/tex]
Mrs. Marlow's class is conducting an investigation of a mixture of sand, iron filings, and salt. They were told that they must separate the mixture into pure sand, pure iron filings, and pure salt using only the physical properties of each component using the following supplies:
bar magnet
filter paper
plastic funnel
water
What is the BEST procedure for the students to follow in order to separate the mixture?
A mixture can be separated by looking at the physical properties of the components of the mixture.
Since salt is soluble in water, water can be added to the mixture to dissolve the salt.
The bar magnet is now introduced in order to remove the iron filings since they are attracted by a magnet.
The solution is filtered to separate the sand from the salt solution.
Lastly, the salt solution is heated to dryness to drive away the water and obtain the solid salt.
Hence the mixture has been separated into its components using their individual physical properties. Option A is the correct answer.
Learn more: https://brainly.com/question/12160179
Answer:
is it a b c or d
Explanation:
What is the mass of 4.99×1021 platinum atoms?
Answer:
[tex]\boxed {\boxed {\sf 1.62 \ g \ Pt}}[/tex]
Explanation:
We are asked to find the mass of a number of platinum (Pt) atoms.
1. Convert Atoms to MolesFirst, we convert atoms to moles using Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are platinum atoms.
We will convert using dimensional analysis so we set up a ratio using the information we know (6.022 × 10²³ platinum atoms in 1 mole of platinum).
[tex]\frac {6.022 \times 10^{23} \ atoms \ Pt}{ 1 \ mol \ Pt}[/tex]
We are converting 4.99 ×10²¹ atoms of Pt to moles of Pt, so we multiply by this value.
[tex]4.99 \times 10^{21} \ atoms \ Pt *\frac {6.022 \times 10^{23} \ atoms \ Pt}{ 1 \ mol \ Pt}[/tex]
Flip the ratio so the units of atoms of platinum cancel.
[tex]4.99 \times 10^{21} \ atoms \ Pt *\frac { 1 \ mol \ Pt}{6.022 \times 10^{23} \ atoms \ Pt}[/tex]
[tex]4.99 \times 10^{21} *\frac { 1 \ mol \ Pt}{6.022 \times 10^{23}}[/tex]
[tex]\frac { 4.99 \times 10^{21}}{6.022 \times 10^{23}} \ mol \ Pt[/tex]
Divide.
[tex]0.008286283627 \ mol \ Pt[/tex]
2. Convert Moles to GramsNext, we convert moles to grams using the molar mass. This is the mass of 1 mole of a substance. This is found on the Periodic Table because it is equivalent to the atomic mass, but the units are grams per mole instead of atomic mass units. Look up platinum's molar mass.
Pt: 195.08 g/molSet up another ratio using this new information (195.08 grams of Pt in 1 mole of Pt).
[tex]\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}[/tex]
Multiply by the number of moles we just calculated.
[tex]0.008286283627 \ mol \ Pt*\frac {195.08 \ g \ Pt}{ 1 \ mol \ Pt}[/tex]
The units of moles of platinum cancel.
[tex]0.008286283627*\frac {195.08 \ g \ Pt}{ 1 }[/tex]
[tex]0.008286283627* {195.08 \ g \ Pt}[/tex]
[tex]1.61648821\ g \ Pt[/tex]
3. RoundThe original measurement of atoms ( 4.99 ×10²¹ ) has 3 significant figures, so our answer must have the same. For the number we found, that is the hundredth place. The 6 in the thousandth place tells us to round the 1 up to a 2.
[tex]1.62 \ g \ Pt[/tex]
There are approximately 1.62 grams of platinum in 4.99 ×10²¹ atoms of platinum.
