Answer:
The reaction between zinc and HCl is given by the symbolic equation
Zn + HCl → ZnCl2 + H2.
Jane wants to study how a person's heart and lungs respond to intense
exercise. She measures the heart rate and breathing rate of 10 people before,
during, and after a 5K race. Which body systems is she studying?
A. Cardiovascular and respiratory
B. Skeletal and urinary
C. Digestive and nervous
D. Muscular and reproductive
SUBMIT
which one of the following is not a mixture?Air,mercury ,milk,cement
mercury is not a mixture it is a element
Answer:
mercury
Explanation:
what is meant by reactive elements
Answer; relative elements are most reactive elements and compounds may ignite spontaneously or explosively. They generally burn in water as well as the oxygen in the air
Explanation:
Answer:
Reactive elements are the elements which are ready to gain electrons because they have incompletely filled outermost shell.
Hope its helpful!
Please mark me as brainlist.
What’s the name of this compound?
how would you detect sulphur in organic compounds
Answer:
sodium fusion is changed to sodium sulphide if sulphur is present in the compound
breaking larger molecules into smaller molecules and carbon
Answer: catabolism
Explanation:
Catabolism refers to the set of metabolic pathways which is necessary for the breaking down of molecules into smaller units. This is then oxidized for the release of energy or can be used to perform other anabolic reactions.
Catabolism is regarded as the opposite direction of anabolism which is simply the building-up of molecules. It should be noted that anabolism and catabolism work together in every living organisms and perform functions such as the production of energy and the repair of cells.
Plz help me with this question
Drawing of water molecular formulas
1.Draw molecular structure of water
Answer:
Here is your answer. I hope it will help you .For each pair (4), choose the stronger bond:
1. H–F (single bond) or H–Cl (single bond)
2. C–C (single bond) or C=C (double bond)
3. F–F (single bond) or H–F (single bond)
4. O=O (double bond) or C=C (double bond)
Answer:
line 3
Explanation:
let me know if you have any questions
****URGENT****
I need help!!!
the answers are there, i need someone to explain please!
Explanation:
your answer was correct
Vitamin C is a water-soluble vitamin, so your body doesn't store it. You have to get the required amount from your diet (citrus fruits are a great source!), or you could take a daily vitamin C supplement pill. Vitamin C is ascorbic acid, so to determine how much vitamin C (acid) has been placed in each pill, you could do an acid-base titration. One vitamin C pill was dissolved in water and titrated to an endpoint by 16.00 mL of a 0.447 M solution of NaOH. How many grams of ascorbic acid were there in the pill? (MW of ascorbic acid is 176.1 /mol). Explain and show your work.
Answer:
1.26 g
Explanation:
Number of moles of ascorbic acid = concentration × volume
Concentration = 0.447 M
Volume = 16.00 mL
Number of moles = 0.447 × 16/1000
Number of moles = 7.152 × 10^-3 moles
Number of moles= mass/molar mass
Molar mass of ascorbic acid = 176.1 g/mol
Mass = 7.152 × 10^-3 moles × 176.1 g/mol
Mass = 1.26 g
How many electrons are in an ion of sulfur (82)?
The Periodic Table
O A. 2
B. 16
O
C. 8
D. 18
Answer:
B 16
Explanation:
the atomicnumber =protons of the atom =electrons do keep in mind that they are charged negatief
You go fishing and obtain some lead weights for your trip. Since you are the smartest chemistry student
in the land, you know that lead's density is 11.34 g/mL. If there are 50 weights in a 250. mL box, what is
the mass of each weight?
Pls show work if u can!
Answer:
56.7g
Explanation:
Density = mass/volume
According to this question, some lead (Pb) of certain weights was obtained on a fishing trip. The density of lead is given as 11.34g/mL. If the 50 weights are placed in a 250. mL box, the mass of the lead are as follows:
Density = mass ÷ volume
11.34g/mL = mass/250mL
mass = 250 × 11.34
mass = 2835g
Since the 50 weight of lead weighs 2835g, then the mass of each weight is calculated as follows:
= 2835/50
= 56.7g
Assertion: Atomic mass of aluminium is 27 Reason: An atom of aluminium is 27 times heavier than 1 / 12th of the mass of the C – 12 atoms.
Answer:
i is the correct answer.
Explanation:
the RAM of aluminum is indeed 27. And since the RAM of substances are measured in terms of the C-12 isotope then R indeed explains why the RAM Al is 27.
What is the shape around each carbon atom in ethylene, H C CH ? The represents a double bond.
linear
trigonal planar
V shaped
tetrahedral
trigonal pyramidal
bent
Answer:
I'm not 100% sure,but I think its trigonal pyramidal
Sodium is dissolved under kerosene oil or paroffin to protect it from the air. 3) State. Huckle's rule for aromaticity with example. How does benzene react with Chlorine in presense of Sun light
Answer:
His rule states that if a cyclic, planar molecule has 4n+2 π electrons
Aniline involves an amine, which is a Choose... functional group. When an aqueous acid solution is added to an organic solution including aniline, the aniline appears in the Choose... layer in its Choose... form. Then, a base is added to Choose... the aniline.
Answer:
Basic
Aqueous
Protonated
Reconstitute
Explanation:
Aniline contains the -NH2 group in which the hydrogen atom bears a lone pair of electrons which is capable of accepting a proton hence aniline is basic.
This lone pair makes it possible for aniline to be protonated to yield an ionic substance which enters into the aqueous phase.
Addition of a base leads to the reconstitution of the aniline.
Câu 1: Trong các dung dịch sau, dung dịch nào làm quỳ tím đổi màu xanh?
A. HCl B. H2SO4 C. NaOH D. NaCl
Câu 2: Bazơ nào dưới đây là bazơ không tan?
A. KOH B. NaOH C. Cu(OH)2 D. Ca(OH)2
Câu 3: Trong các chất sau đây, chất nào không phải là muối?
A. HCl B. KCl
C. NaOH
C. Cu (OH)
A. HCl
Aluminum hydroxide containing medicine is used for gastric why
Answer:
Aluminum Hydroxide, Magnesium Hydroxide are antacids used together to relieve heartburn, acid indigestion, and upset stomach. They may be used to treat these symptoms in patients with peptic ulcer, gastritis, esophagitis, hiatal hernia, or too much acid in the stomach (gastric hyperacidity).
Answer:
wow it's a very nice question
What unusual physical property does liquid sulfur exhibit from about 113∘C to 230∘C? Select the correct answer below: A. Its vapor pressure decreases with increasing temperature. B. Its vapor pressure increases with increasing temperature. C. Its viscosity decreases with increasing temperature. D. Its viscosity increases with increasing temperature.
Answer:
C. Its viscosity decreases with increasing temperature
Explanation:
The liquid Sulphur is a liquid that turs yellowish green. At a temperature of 120 it tends to melt and has a lower viscosity.what is chemical formula of water ? how it is composed
Answer:
H2O
Explanation:
it is composed of 2 atoms of Hidro and 1 atom Oxy
Answer:
The chemical formula for water is H2O..it is composed by the bonding of 2 molecules of hydrogen and one molecule of oxygen,a covalent bond to be specific.
I hope this helps
(a) How many significant figures should be reported for
the volume of the metal bar shown below? (b) If the
mass of the bar is 104.7 g, how many significant figures
should be reported when its density is calculated using
the calculated volume? [Section 1.5]
The number of significant figures will be four (4)
UM UM UM HELP AGAIN. which of the following would increase the pressure of a gas
a. letting out air of an air mattress
b. taking a breath of air
c. lying on an air mattress
d. throwing a balloon into the air
Answer:
I think c) laying on an air mattress
Which statement describes the periodic law?
Help please now!
Answer:
Answer is: elements in the same group have similar chemical properties. Periodic law is the arrangement of the elements in order of increasing atomic number.
A 100 g sample of potassium chlorate, KCIO3(s), is completely decomposed by heating:
2 KCIO3(s) 2 KCl(s) + 3 O2(g)
The oxygen is collected at 89 kPa and 23°C. Calculate the volume, in litres, of oxygen that would be
produced during the decomposition of this sample.
cual es la importancia de los solidos en la vida ?
Answer:
La comida es un sólido y no podemos vivir sin comida. Algunos sólidos son buenos conductores de calor y electricidad; otros son aislantes. Los sólidos se utilizan todos los días en la vida.
which of the following represents a beta particle?
Answer:
[tex]{ \sf{A. \: \: { _{ - 1}{}^{0} e }}}[/tex]
A beta particle is an electron.
Explanation:
[tex]{ \tt{ {}^{4}_{2}He \: \: is \: an \: alpha \: particle.}} \\ { \tt{ \gamma \: \: is \: gamma \: rays}} \\ { \tt{ \alpha \: is \: same \: as \: alpha \: particle}}[/tex]
The beta particles are the high energy electron radiations, with the representation as as [tex]\rm ^0_{-1}e[/tex].
What are nuclear reaction radiations?The nuclear radiations result in the release of the mass in the form of varying types of particles. The particles ejected in nuclear reaction are alpha, beta, or gamma particles.
Beta particles are high energy particles with the presence of negative charge with the loss of electron.
The beta particle can be represented as [tex]\rm ^0_{-1}e[/tex]. Thus, option A is correct.
Learn more about beta particles, here:
https://brainly.com/question/1685421
2HNO3+ Cu O -> Cu (NO3)2 + H₂O
Answer:
it is already balanced bro
hii pls help me to balance the equation thanksss
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
[tex]\pmb{\red{\boxed{\sf{Na_{2}O(s)+H_{2}O(l)\dashrightarrow 2NaOH(aq) }}}}[/tex]
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
3g of clean mg ribbon and 8g of clean copper metal was burnt separately in equal volume of air and both mass reacted completely with air state and explain where they was greater change in mass??
Answer:
gshshs
Explanation:
bshsjskskehhshs
The copper metal is heated in the air. The magnesium ribbon emits a brilliant light and magnesium oxide, which is white. When oxygen is passed over copper (in the presence of heat), an oxidation reaction occurs, resulting in the formation of black copper oxide. The greater change in mass observed when they start to burned.
What is copper metal ?Copper is a mineral and an element that is essential to our daily lives. It is a significant industrial metal due to its high ductility, malleability, thermal and electrical conductivity, and corrosion resistance. It is a necessary nutrient in our diet.
Metals are a class of materials that have high electrical and thermal conductivity, as well as malleability, ductility, and high light reflection. Copper (Cu), aluminium (Al), and other metals are examples.
The combustion of magnesium ribbon is a combined reaction. This is due to the fact that magnesium reacts with oxygen to form the single product magnesium oxide. When magnesium ribbon is burned in air, it reacts with the oxygen in the air to form magnesium oxide.
Thus, 3g of clean mg ribbon and 8g of clean copper metal were burnt separately in equal volume of air and both mass reacted completely with air the greater change in mass observed when they start to burned.
To learn more about copper metal, follow the link;
https://brainly.com/question/11992235
#SPJ2
Which factor would speed up a chemical reaction? (Choose all that apply)
Decreasing particle size
Increasing the temperature
Decreasing the temperature
Increasing particle size
Answer:
Increasing the temperature
Increasing particle size
Explanation:
Increasing the temperature allows for particles and molecules to move faster (because there is an increase in energy) and allows for more collisions.
∴ Increasing the temperature would be an answer.
Increasing the particle size allows for more surface area and a greater chance for particles to collide with each other.
∴ Increasing particle size would be an answer.
Topic: AP Chemistry
Unit: Kinetics
