Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
-
a scientist conducts a procedure that causes nitrogen atoms to gain neu…
B. isotopes of nitrogen
-
what is used to separate mixtures into their pure components? a macerat…
B. Distillation, D. Filtration
-
because oxygen is more electronegative than hydrogen, the water molecul…
D. polar
-
question 4 a pure substance composed of two or more different elements …
A pure substance composed of two or more different elements chemically combined is known as a compound.
-
question 7 listen the smallest particle of an element that retains its …
atom
-
44 multiple choice 2 points in patients with lactose intolerance, _____…
chemical digestion of carbohydrates
-
regardez le dessin. complétez la phrase avec le nom de létudiant(e), du…
1. Marie porte un jean et une chemise blanche. 2. Inès porte un short beige et des sandales beiges. 3. Marie (assuming a student with hat and coat in the picture) porte un chapeau…
-
the area around a nucleus where an electron is most likely to be found …
orbital
-
43 multiple choice 2 points the portion of the small intestine that per…
B. duodenum
-
when atoms gain or lose electrons, they can become negatively or positi…
D. Ions
-
16 identify the reactants in the following chemical equation 6 h₂o + 6 …
16. Water ($H_2O$) and carbon - dioxide ($CO_2$) 17. Breaking and forming 18. 14 19. Decrease 20. Product 21. Atoms 22. Adhesion 23. Activation energy 24. Carbohydrates 25. Amino …
-
what role does water play in chemical weathering? a. it absorbs heat fr…
1. d. It dissolves minerals 2. a. Freeze - thaw cycles
-
protons: 8 neutrons: 9 electrons: 8 what is the total charge?
0
-
protons: 8 neutrons: 9 electrons: 10 what is the total charge?
-2
-
match the people to their contribution match term definition 1. james c…
1. F 2. H 3. A 4. B 5. D 6. G 7. E 8. C 9. J 10. I
-
what is the mass number?
4
-
8. name the element which has the following number of particles: a. 26 …
a. Iron (Fe) b. Iodine (I) c. Helium (He) d. Calcium (Ca) e. Lead (Pb) f. Hydrogen (H)
-
find the element:
He (Helium)
-
find the element: protons: 8 neutrons: 9 electrons: 10
O
-
atom a 1. how many protons are in atom a? 2. how many neutrons are in a…
1. 1 proton 2. 0 neutrons 3. 1 electron 4. 1 (atomic mass) 5. 1 (atomic number)
-
find the element: protons: 5 neutrons: 5 electrons: 5
Boron (B)
-
find the element: is it: neutral atom ion
Neutral Atom
-
atom a 1. how many protons are in atom a? 2. how many neutrons are in a…
a. Iron (Fe) b. Iodine (I) c. Helium (He) d. Calcium (Ca) e. Lead (Pb) f. Hydrogen (H)
-
g h2 to mol h2 using atomic mass of h2 mol h2 to mol h2o using balanced…
Limiting reactant: $O_2$ Excess reactant: $H_2$ Mass of $H_2O$ produced: $11.3g$
-
warm up limiting reagent show your solution/ work (no work / solution =…
Limiting reagent: $O_2$, Excess reagent: $H_2$
-
in chemistry, how does an orbital get its name? because it contains par…
because it contains particles that move around the nucleus
-
did you ever get a chemistry set as a kid? if so, did it have real chem…
A. A series of questions
-
the power of music 1 many people think of music as a source of entertai…
1. N/A 2. a transitional word or phrase. 3. repetition of the key - related concept. 4. a pronoun substituted for the key word. 5. repetition of the key word. 6. a transitional wo…
-
encircle or box your final answer. limiting reagent problem #1: for the…
Limiting reagent: $O_2$, Excess reagent: $H_2$
-
select the word that means deal with. the taj mahal is an amazing build…
tackle
-
problem #1: for the combustion of sucrose: limiting reagent h2 + o2 -->…
$O_2$ is the limiting reagent.
-
for each list, place elements in order of least to greatest electronega…
1) Na, Si, Cl 2) In, Ga, B 3) Na, Si, O
-
what rules can you use to tell how many protons, neutrons and electrons…
For an atom: Protons = atomic number; Electrons (in neutral atom) = protons; Neutrons = mass number - atomic number. For an ion: Protons = atomic number; Electrons = protons - cha…
-
is this the correct change in ph? hint: the change in ph can be negativ…
Tube 1: -4 (for 1 drop), -5 (for 3 and 5 drops); Tube 2: 0; Tube 3: 0
-
body paragraph 2: another common myth is that brown foods are better fo…
Refer to a study that shows the benefits of certain types of brown food. Provide examples of brown foods that do have health benefits.
-
apeman practice and matching match the term to its definition match ter…
1. E 2. O 3. H 4. N 5. M 6. I 7. K 8. L 9. F 10. No match 11. G 12. C 13. A 14. D 15. B
-
ionization energy the ionization energy of elements increases moving up…
The ionization energy of elements increases moving UP each group and RIGHT across each period.
-
9. using all of the rules you have determined, figure out what changes …
| Make the change | What changes also? Element name, charge, mass? | | ---- | ---- | | Add a proton | Element name changes, charge increases by 1, mass increases | | Remove a neut…
-
condensation reactions and hydrolysis reactions are two important (and …
$H_2O_2 + H_2O_2 ightarrow2H_2O + O_2$: neither $CH_3OH+HCl ightarrow CH_3Cl + H_2O$: neither glucose + glucose $ ightarrow$ maltose + $H_2O$: condensation $ATP + H_2O ightarrow A…
-
5. what determines the element?
The number of protons in the nucleus of an atom.
-
5. test your idea by identifying the element for the 3 cases.insert cap…
1. Carbon 2. Nitrogen 3. Carbon
-
4 explore until you can explain some good rules about the mass of your …
Rules about atomic/ionic mass are formulated and a testing method with evidence (screen captures) is designed as described above.
-
exercise 8 identifying adjectives in sentences draw a line under each a…
1. the (D), best (A), fall (A) 2. a (I), few (A), incredible (A) 3. the (D), mid - Atlantic (A), Appalachian (A) 4. the (D), ideal (A), native (A) 5. the (D), certain (A), yellow …
-
atomic radius the atomic radius of elements increases moving down each …
The atomic radius of elements increases moving DOWN each group and LEFT across each period.
-
type the element in each list with the largest atomic radius: na, al, m…
Na Rb Ba Fr
-
atomic radius the atomic radius of elements increases moving down each …
RIGHT
-
the atomic number is when looking at the symbol. write the symbols and …
The symbol is C and the atomic number is 6.
-
the proportions of elements in the human body and the earths crust are …
C. Organisms that live on land (like humans) must expend energy to concentrate some elements that are found in relatively low amounts in the Earth's crust.
-
the proportions of elements in the human body and the earths crust are …
We can conclude that the proportions of elements in the human body and the Earth's crust are quite different.
-
2. explain patients’ rights and why they are important multiple choice …
1. D. The right to protection of privacy 2. A. The right to high - quality care 3. B. The right to a clean and safe environment 4. D. The right to protection of privacy 5. A. The …
-
part 2 (1 point) which of the orbital diagrams represent(s) an excited …
A. Option A, B. Option B, D. Option D
-
3. what are some good rules about the charge of your atom or ion? a. wh…
a. The number of protons equals the number of electrons in a neutral atom. b. An atom forms a positive ion by losing electrons, resulting in more protons than electrons.
-
part 1 (1 point) which of the orbital diagrams represent(s) the ground …
B.
-
9 fill in the blanks to complete the sentences. all substances are made…
conditions
-
4th attempt part 1 (1 point) which of the orbital diagrams represent(s)…
We need to see the specific orbital diagrams in options A, B, C, D to determine the correct answer. Since the diagrams are not clearly described in text, we cannot give a definite…
-
a(n) ____ in the concentration of reactants will result in a(n) ____ in…
increase, increase
-
part 1 (1 point) which of the orbital diagrams represent(s) the ground …
Part 1: A. Part 2: B.
-
the necessity of solitude is deeper than we have said, and is organic. …
The text discusses philosophical ideas about solitude, self - perception in social contexts, and the nature of cooperation in society.
-
2. theme patterns describe any relationships between atomic numbers and…
# Breve explicación: 2. En general, en la tabla periódica, a medida que el número atómico aumenta en una serie, el punto de fusión tiende a variar de manera compleja. En algunos c…
-
18 question (3 points) predict and write the charges and symbols (e.g.,…
Part 1: $S^{2 - }$ Part 2: $P^{3 - }$ Part 3: Ar
-
1. sep developing and using models look at the data in the table. const…
# Explicación paso a paso: ## Paso 1: Analizar los valores máximos y mínimos Los valores mínimos de los números atómicos son 20 (Ca) y los máximos son 88 (Ra). Para los puntos de …
-
18 question (3 points) predict and write the charges and symbols (e.g.,…
Part 1: $S^{2 - }$ Part 2: $P^{3 - }$
-
8. the mass of one gold atom is approximately 3.27 x 10^(-11) ng. how m…
3.27×10⁻²⁰ g
-
7. the radius of a carbon atom is 70 pm. how many centimeters is 70 pm?
$7\times 10^{-9}\ cm$
-
4. convert 2.5 x 10^{-3} g of vitamin a in zeptograms.
2.5×10^{18} zg
-
3. convert 1.60 gl of ethanol in microliters.
$1.60\times 10^{15}$ μL
-
summarize fill in the missing words to tell how to separate mixtures. t…
(5) propiedades (6) magnetismo (7) más grandes (8) filtro (9) se disuelve (10) filtro (11) arena (12) evaporar
-
5 what happens to energy in ice that melts into liquid water? a it decr…
D. It increases and the water molecules move faster
-
write s if the photo and caption describe a mixture that is a solution.…
(1) M (2) S (3) M (4) S
-
5 what happens to energy in ice that melts into liquid water? a it decr…
None of the above options are correct. The correct answer is that energy increases and the water - molecules move faster.
-
4 which word best describes the arrangement of particles in a gas? a sc…
A. Scattered
-
part 3 (1 point) calcium chloride contains calcium and chloride ions. w…
Part 3: Full: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ Condensed: $[Ar]$ Part 4: Full: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}$ Condensed: $[Ne]3s^{2}3p^{6}$
-
states of matter i quiz (graded) - 9 questions 2 what happens to water …
B. They move faster
-
assignment states of matter i quiz (graded) - 9 questions 1 waters chem…
C. Each water molecule contains two hydrogen atoms and one oxygen atom
-
3. sep develop models chemical formulas and ball - and - stick models c…
**Advantages of Chemical Formulas**: Concise; useful for calculations and quick reference. **Disadvantages of Chemical Formulas**: Lack 3 - D structural information. **Advantages …
-
are chemical substances that alter your mood and perception psychodynam…
B. Psychoactive drugs
-
sep develop models chemical formulas and ball - and - stick models can …
Advantages of chemical formulas: Concise, good for calculations. Disadvantages: Lack 3 - D visualization. Advantages of ball - and - stick models: Show 3 - D structure. Disadvanta…
-
2. identify use a periodic table and the chemical formula for the clean…
| Symbol | Element | Number of Atoms | | ---- | ---- | ---- | | Na | Sodium | 2 | | B | Boron | 4 | | O | Oxygen | 7 |
-
3. convert 1.60 gl of ethanol in microliters.
$1.60\times 10^{15}$ μL
-
b. why is it possible to use physical properties to separate a mixture?
Los componentes de una mezcla mantienen sus propiedades físicas individuales, lo que permite diferenciarlos y separarlos.
-
2. convert 0.049 kg of sulfur into grams.
49 g
-
1. distinguish compare and contrast the elements and compounds in terms…
Elements: $Ar$, $Hg$, $I_2$ Compounds: $CH_4$, $H_2SO_4$, $KNO_3$, $SiO_2$
-
26 are state changes physical or chemical changes? * (0.5 points) chemi…
B. Physical change
-
answer these questions in terms of what you know about mixtures. a. how…
Cambiar las proporciones de las sustancias en un aleación puede afectar sus propiedades físicas y químicas, como dureza, resistencia, conductividad eléctrica y térmica, debido a c…
-
24 the state symbol (aq) means: * (0.5 points) dissolved in water hazar…
24. dissolved in water 25. False
-
19 the state symbol (s) means: * (0.5 points) slime small state stoichi…
solid
-
18 what is dry ice? * (0.5 points) solid carbon monoxide solid carbon d…
B. solid carbon dioxide
-
1st attempt part 1 (1 point) to format the electron configuration corre…
Full: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$, Condensed: $[Ar]4s^{2}$
-
select the correct answer. what is the greatest difference between ben …
B. tone
-
1st attempt part 1 (1 point) to format the electron - configuration cor…
Full: 1s$^{2}$2s$^{2}$2p$^{6}$3s$^{2}$3p$^{6}$4s$^{2}$; Condensed: [Ar]4s$^{2}$
-
4 demonstrate that some mixtures maintain the physical properties of th…
# Explicación detallada: ## Paso 1: Analizar la mezcla de alfileres y anillos Los alfileres son metálicos y son atraídos por un imán. Los anillos, si no son metálicos ferromagnéti…
-
why does the procedure ask you to use a new graduated cylinder with eac…
Reusing the graduated cylinder will contaminate the unknown solutions due to residue remaining in the cylinder.
-
in this excerpt from annus mirabilis, john dryden speaks about london a…
Methinks already from this chemic flame, I see a city of more precious mould Rich as the town which gives the Indies name, With silver paved, and all divine with gold
-
the elements of art unit test instructions: write the letter of the cor…
1. B 2. D 3. R 4. E 5. G 6. J 7. F 8. K 9. A 10. I 11. C 12. H 13. L 14. N 15. O 16. S 17. M 18. Q 19. P 20. Rhythm
-
apply concepts 2 classify. circle the substances below that are solutio…
2. drink from a mix 3. Pila de libros, lápiz de colores, montón de bolígrafos, pila de papeles, juego de bloques
-
a student tests how quickly sugar dissolves in cold water, room - tempe…
What is the independent variable? - Temperature of water What is the dependent variable? - Rate of sugar dissolution What should be kept constant? - Amount of sugar, volume of wat…
-
in 1976, the american chemical society recognized tin(ii) fluoride toot…
A. $[\text{Sn}]^{2 + }$
-
you might need: calculator, periodic table the lewis diagram below repr…
D. $3+$
-
states of matter and changes of state (pib chemistry period 4) 8 which …
8. D. the particles in a solid are fixed in place, but they do vibrate back and forth 9. gas, liquid, solid
-
7 which state of matter has the weakest attraction between their partic…
Gas