Chemistry High School

please help me with my question ​

Please Help Me With My Question

Answers

Answer 1

Answer:

b

Explanation:

because I had that on my homework and got it correct

Answer 2

b

Explanation:

because I had that on my homework and got it correct

Related Questions

Scientists have cited gas emission as contributing to global [blank] , which is a general increase in temperatures worldwide.

Answers

Answer:

Warming

Explanation:  Greenhose gases (CO2, CH4, etc.) trap heat in Earth's atmosphere since they absorb wavelenghts of light associated with heat.

Someone plz help me ;-;

Answers

Answer:

the events of the story

Explanation:

hope this helps

Help me with physical science

Answers

Answer:ok

Explanation:fish

Match the event with the type of change.
a. Making ice cubes from water
b. Making hot water for tea
c. Using dry ice to create a foggy punch bowl
а
<
1. Changes Between Liquids and Solids
2. Changes Between Liquids and Gases
3. Changes Between Solids and Gases
a
<
av

Answers

Answer:

A-1,

B-2,

C-3 is the answer of this queation

1. Is each of the following statements true or false? Correct any that are false.

a. A mole of one substance has the same number of atoms as a mole of any other substance
b. The theoretical yield for a reaction is based on the balanced chemical equation
c. A limiting reactant problem is being stated when the available quantity of one of the reactants is given in moles
d. The empirical and molecular formulas of a compound are always different.

Answers

The answer is letter B

1. What is Science?
A. The goal of science is to investigate and understand the natural world, to explain events in the natural
world, and to use those explanations to make useful predictions.

Answers

a. That is the o my option. Hope this helps!

100g of radioactive mass has a half life of 5 days. Calculate the mass decayed off after 15 days

Answers

Answer:

12.5 gm

Explanation:

15 days is three half lives  

100 * (1/2)^3 = 12.5 grams

PLS I NEED HELP
The distance from the Sun to Mercury is 3.598 • 10^7
miles. The distance from the Sun to Neptune is
2.798. 10^9 miles. How far is Mercury from Neptune?
Write your answer in scientific notation.

Answers

Answer:

4.44309 × 109 ( 4443090000 kilometres )

2.760936126 × 109 ( 2760936126 miles)

Please make me the brainliest! !!

Answer:

The distance of Mercury to Neptune = The distance from sun to Neptune - The distance from sun to Mercury

= 2.798 . 10^9 - 3.598 . 10^7

= 2.798 . 10^9 - 0.03598 . 10^9

= 10^9 ( 2.798 - 0.03598 )

= 2.76202 . 10^9 miles

.

.

Hope it helps

Why is sodium a significant source of calories in both foods

Answers

Answer: Sodium is made up of lots of salt.

Explanation:

Eating a lot of salt can cause your body to retain more water, which can show up on the scale as extra pounds. But we're not just talking about water weight here. High salt diets appear to be linked to higher body fat in particular, the kind of fat that accumulates around your middle.

arlon drank 500 mL of softdrink which had a mass of 450 g.

a. 1.11 g/mL c. 0.9 g/mL
b. 50 g/mL d. 225000 g/mL

Answers

Answer:

0.9 g/mL

Explanation:

The density of a substance can be found by using the formula

[tex]d = \frac{m}{v} \\ [/tex]

where

m is the mass

v is the volume of object

From the question we have

m = 450 g

v = 500 ml

[tex]d = \frac{450}{500} = \frac{9}{10} \\ = 0.9[/tex]

We have the final answer as

0.9 g/mL

Hope this helps you

Answer:

B) g/mL

Explanation:

Mass of Oxalic acid (solute) = 11g

Mass of Solution = 500ml

Density = 1.1 g/ml

We know that

Mass % of solute =

Massofsolution

Massofsolute×100

×

50

Mass of solution =

Volume of solution×

Density of solution

Mass of solution =

500×

1.1=

50×

11g

Mass % of the solute =

11×50

11×100

=

2%

What is the number of nitrogen molecules in 6.0 moles of N2?

Answers

Explanation:

just take the given moles and multiply it with the ratio of molecules to moles to get your answer

The number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴

How to calculate number of molecules

Avogadro's number( 6.02 × 10²³) is equal to the number of molecules in 1 mole of substance.

That is,

1 mole of N2 = 6.02 × 10²³

6 moles of N2 = 6 × 6.02 × 10²³

= 36.12 × 10²³

= 3.6 × 10²⁴

Therefore, the number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴

Learn more about molecules here:

https://brainly.com/question/26044300


The neutrons affect the stability of the nucleus of the atom. True or False

Answers

Answer:

True.

Explanation:

This is because when the number of protons in the nucleus increases the neutrons needed for a stable nucleus increases even more rapidly.

Best of luck!!!

When sodium reacts with Iron(II)and chloride iron metal and sodium chloride are formed what are the coefficient used in this reaction?

Answers

When sodium metal reacts with iron (II) chloride, iron metal and sodium chloride are formed. - 2 Na(s) + Fella (s) → Fe (s) + 2Naci.

Why does magnesium chloride need to be molten in electrolysis

Answers

Answer:

this is from another brainliest answers.

Explanation:

Ionic compounds need to be molten or in solution for electrolysis to work. This is because the charged particles that make them up (ions) need to be free to move to the electrodes.

Employers may not fire or other wise discriminate against an employee who does which of the following

Answers

Answer:

race, religion, sex, if they are 40 or older, have a disability, pregnancy/childbirth. hope that helped

4. Write the electronic configuration of first 20 elements in the periodic table.

Answers

Hydrogen: 1

Helium: 2

Lithium: 2•1

Beryllium:2•2

Boron: 2•3

Carbon: 2•4

Nitrogen:2•5

Oxygen:2•6

Fluorine: 2•7

Neon:2•8

Sodium: 2•8•1

Magnesium: 2•8•2

Aluminium: 2•8•3

Silicon: 2•8•4

Phosphorus: 2•8•5

Sulfur: 2•8•6

Chlorine: 2•8•7

Argon: 2•8•8

Potassium: 2•8•8•1

Calcium: 2•8•8•2

Please give me brainliest, I spent a lot of time doing this

Lavoisier made an important contribution to chemistry by _____.

developing the atomic theory of matter
developing the law of conservation of matter
developing the law of multiple proportions
coining the term "atom"

Answers

developing the atomic theory of matter

Answer:

developing the atomic theory of matter

Explanation:

How many grams are there in 6 moles of water, full working​ out?

Answers

1 mole of water = 18g

6 moles of water = 18×6 = 108 g

Please help it’s worth a lot!! I need the answer ASAP!!

Answers

Answer:

Show me the previous question so I can help

You are given 2 balls that are made of the same material. They are also the same size and color. One is hollow and one is solid. Determine the physical property that could be used to identify the ball as a solid.
Group of answer choices

boiling point

solubility

pH

density

Answers

Answer:density

Explanation:

it’s how’s how dens the ball is

what does it mean when a reaction has a negative amount of Kj

Answers

Answer:

heat is released in going from reactants to products

Explanation:

hope this helps

A loud sound has a large

Answers

Answer:

This extra energy causes the string to vibrate more, which helps it move more air particles for a longer time. A string plucked with force has greater amplitude, and greater amplitude makes the sound louder when it reaches your ear. Volume depends on amplitude. Greater amplitude produces louder sounds.

What are three properties of inertia?

Answers

1. rigid body assumption
2. CM motion to represent linear motion
3. dynamics discussions

formation of bubbles can be associated with physical changes under certain contexts. provide examples of specific substances and describe the situations in which bubbles form during a physical change and a chemical change.

Answers

Sorry bro don’t know same boat u in

1. What are they key characteristics scientists look for to figure of it something is real science or pseudoscience?


2. What are the five main steps in the scientific method?



3.What is a physical property?



4. What are the two types of physical properties?

Answers

Answer:

Among these warning signs are: A tendency to invoke ad hoc hypotheses, which can be thought of as “escape hatches” or loopholes, as a means of immunizing claims from falsification. An absence of self-correction and an accompanying intellectual stagnation. An emphasis on confirmation rather than refutation.oMake an observation.Ask a question.Form a hypothesis, or testable explanation.Make a prediction based on the hypothesis.Test the prediction.Iterate: use the results to make new hypotheses or predictions.

3. A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance

4.extensive and intensive properties.

PLEASE MARK ME BRAINLIEST

Define the following terms:
-hypothesis:
- theroy:
-law:

Answers

Answer:

hypothesis = A tentative explanation for a question, testable through experiments.

theory = An explanation supported by many experiments, answers "why".

law = A relationship in nature supported by many experiments.

Explanation:

What are the 2 characteristics of all matter

Answers

Shape, color, size, temperature

Use the information from the diagram to calculate the enthalpy of combustion for methane.

(IGNORE MY ANSWER PLZ I ACCIDENTALLY CLICKED IT)

SOMEBODY PLZ HELP ME I REALLY NEED IT PLZZZZZZZZ

Answers

Answer:

The answer is A) -604KJ

Explanation:

I just took the Penn Foster test. =D you welcome!

. Restate What is a physical change in terms
of particle arrangement?

Answers

Answer:

In physical changes no new materials are formed and the particles do not change apart from gaining or losing energy

Explanation:

a molecule of an element is called what?​

Answers

Answer:

a molecule of an element is called atomicity

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