Chemistry High School

answer pls ASAP will mark the brainliest

Answers

Answer 1

First one……………………………….

Answer 2

For me that is the first :

Both the identity and the properties of a substance change.

Related Questions

how should the mass of copper metal at the end of the reactions compare to the starting mass of copper?

Answers

Answer:

The produced mass of copper should equal the starting mass of copper.

Why is oil found in Middle East but not in Hawaii

Answers

as a person who lived in the middle east, i can assume the middle east consumes more oil than Hawaii.

Which chemical family below would the element iodine most likely belong to?
Family D
Family C
Family A
Family B

Answers

Answer:

it is option A

Explanation:

Best of luck in whatever you are doing

Someone pls help me I will make you brain

Answers

Answer:

it is c greenhouse effect please mark me brainliest

Explanation:

Answer:

green house effect

Explanation:

The answer is green house effect.

If a chemical reaction occurs in a flask, and the flask becomes colder, the reaction was exothermic. true or false

Answers

Answer:

false

Explanation:

hope this helps you

Answer:

False, if the flask becomes colder it's endothermic. I hope this helps! :)

In a beaker, 300 grams of water at 80°C cools down to 20°C. Assume all the heat from the water is absorbed by 100 cubic meters of air, with a mass of 100.000 grams . What is the temperature change in the air?

Answers

Answer:

mass of water, mw = 300g = 0.3kg

∆Tw = (80 - 20) °C

volume of air, va = 100m³

mass of air, ma = 100g = 0.1kg

∆Ta = ?

H = mc∆T

Hw = mwcw∆Tw

Hw = 0.3*4200*60

Hw = 75600J

Hw = 75.6 kJ

All the above heat energy got absorbed by air,

that is; Ha = 75600J

since it's given that the heat was absorbed by a specific amount of volume of air

then specific capacity of volume of air is

then,

ca = Ha × density

ma temp

then,

Ha = vaca∆Ta

where, ca = volumetric heat capacity of air = 0.012kJ/m³°C

75.6kJ = 100m³ × 0.012kJ/m³°C × ∆Ta

75.6 = 1.2/°C × ∆Ta

∆Ta = 63°C

63°C is the temperature change in air.

hi. i need help with this. i lack with this subject

Answers

Answer: It's the circulatory system

Explanation:

Where in the cell do most aerobic respiration take place?
a)
mitochondria
b)
cell membrane
c)
nucleus

Answers

A) Mitochondria is correct

An element is composed of one type of atom with its own unique properties. TRUE OR FALSE

Answers

Answer:

It's true

Hope it helps:-)

Answer:

true

Explanation:

Which traits does the western harvest mouse have that might be adaptive for the environment where it lives?

Answers

Its tail helps it climb down the tall grasses and lets it swing from the grass like a monkey in a tree

Explanation:

Answer:

Into the adaptive Trait!

Explanation:

Someone pls help me I will make you brain

Answers

Answer:

It is true answer. Ozone = O3

A valence electron is
a) any electron in the highest energy level of an atom
b) the electron closest to the nucleus of an atom
c) any electron that does not take part in chemical bonding
d) the electron that is gained when a cation is formed

Answers

I believe is a valence electrons are in the outermost energy level of the atom

Read the statements. In eukaryotic organisms, genes usually consist of two alleles. The two alleles are often on different parts of the same chromosome.
These sentences contain incorrect information. Which option describes the mistake?

○ In Eukaryotic organisms, the two alleles of the gene are on different chromosomes.

○ in eukaryotic organisms, genes are usually spread over four or more chromosomes,

○ In eukaryotic organisms, genes usually consist of a single allele.

○ In eukaryotic organisms, the two alleles of the gene are joined end to end on the same chromosome.

Answers

Answer:

I think its B but im not too sure

Which option correctly describes the pattern of valence electrons on the periodic table? (1 point)
o The number of valence electrons increases from right to left.
O The number of valence electrons increases from left to right.
O The number of valence electrons increases from bottom to top.
O The number of valence electrons increases from top to bottom.

Answers

Answer:

The number of valence electrons increases from left to right.

Explanation: The number of valence electrons increases going across a period, or row in the periodic table, for example, group 1 elements have 1 valence electrons and group 2 elements have have 2.

Pleaseee helppp!!!!!

Answers

Answer:

it releases energy that is used for power

Explanation:

Answer: It releases energy that is used for power.

Explanation: https://www.investopedia.com/terms/h/hydrocarbon.asp

Question 116 g of sunflower oil is
used in a recipe. The density of the
oil is 0.925 g/mL. What is the volume
of the sunflower oil in mL?

Answers

Answer: 125.41 mL

Explanation:

Volume = mass ÷ density

= 116 g ÷ 0.925 g/mL

= 125.41 mL

A 116 g of sunflower oil of 0.925 g/mL has a volume of 125.41 mL.

Please help me with chem, it would be very appreciated!
why it is necessary to draw a Lewis diagram before predicting the shape of a molecule

Answers

To determine the shapes of molecules, we must become acquainted with the Lewis electron dot structure. Although the Lewis theory does not determine the shapes of molecules, it is the first step in predicting shapes of molecules. The Lewis structure helps us identify the bond pairs and the lone pairs.

Please mark BRAINLIEST.

How many electrons are there in an atom with 3 protons?

Answers

Answer:

3 electrons

Explanation:

For every proton there is an electron.

Answer:

3 electrons

Explanation:

atoms are neutral in electrical charge because they have the same number of electrons as protons.

a change in the composition of matter _____________ occurs during a chemical reaction.

Answers

Answer: During a chemical change, the composition of matter always changes

Explanation:

Why is there gold on the inside of a cell phone but plastic on the outside

Answers

Answer:

Gold is chemically stable and conducts electricity.

Small pockets of gold are used to make mobile phone circuit board.

The plastic is lined to act as antenna gate. It's what makes a phone not a calculator but a communication point, since it allows the data flow, Bluetooth connection, Wi-Fi. Mainly, it allows radio waves to flow.

Please help. Thank you!
what is the electron configuration of uranium at its ground state (in order) AND noble gas configuration?

Answers

Answer: Uranium is a chemical element with atomic number 92 which means there are 92 protons and 92 electrons in the atomic structure. The chemical symbol for Uranium is U. Electron configuration of Uranium is [Rn] 5f3 6d1 7s2. Possible oxidation states are +3,4,5,6.

Explanation:

Answer:

Electron configuration of uranium at its ground state: 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6s6 5f3 6d1 7s2

Noble gas configuration: [Rn] 5f3 6d1 7s2.

NO LINKSSSS PLEASE!!!

Salt is added to water at room temperature, and the solution remains at room temperature. Which of the following does not apply to the more concentrated salt solution?

Select one:
a. It has a higher boiling point than water.
b. It has a greater electrical conductivity than water.
c. It has a lower freezing point than water.
d. The salt absorbs energy from the water.

Answers

Answer:

Explanation:

Which statement about exothermic reactions is TRUE?
A.In an exothermic reaction, energy is absorbed, bonds are broken, and the temperature decreases.
B. In an exothermic reaction, energy is released, bonds are formed, and the temperature increases.

Answers

Which statement about exothermic reactions is TRUE?

A.In an exothermic reaction, energy is absorbed, bonds are broken, and the temperature decreases.

B. In an exothermic reaction, energy is released, bonds are formed, and the temperature increases.

which physical quantity is not used when determining the stoichiometry in this experiment?

Answers

The physical quantity that is not used when determining the stoichiometry in this experiment is temperature.

Stoichiometry offers a way in which we can calculate the amount of reactants and products using mass - mole relationship. The mass of reactants, number of moles of reactant, mass of product and mass of precipitate can all be used to determine the stoichiometry.

However, the temperature of a reaction is not used to determine the stoichiometry of the reaction.

Learn more: https://brainly.com/question/17320375

Which physical quantity is NOT used when determining the stoichiometry in this experiment?

mass of precipitate mass of product moles of reactant temperature

what type of nuclear

Answers

Answer:

fussion

your welcome

What are the atoms of Fe(SCN)3

Answers

Answer:

55.845

Explanation:

yep

29. Which type of orbital is shown?

Z

Y

Х

Answers

Answer:

Explanation:

Someone pls help me I will make you brain

Answers

Answer:

B I and II

Explanation:

warming and melting.

please mark me brainliest

Kim loại đòng sắt đc tạo từ nguyên tố nào

Answers

Answer:

sup brö how is it back home?

Explanation:

just curious you know

Which of the following is a liquid someone help!!!!!

Answers

answer: juice (C)

this question is most likely a joke :)

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