CHEMISTRY MIDDLE SCHOOL

32:53A chemist is studying an unknown substance. He can break it into its elemental components only by using chemical means.
Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
O pure substance
Previous Activity
1:06 PM
10/20/2019
ch
Bi

Answers

Answer 1

Answer:

Answer:

A solution

Explanation:

Mainly because a solution is a mixture of chemically bonded elements.

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Which condensed structural formula represents an unsaturated compound?(1) CH3CHCHCH3 (3) CH3CH3
(2) CH3CH2CH3 (4) CH4

Answers

(1) CH3CHCHCH3.................

(1) CH3CHCHCH3 because it contains a double bond.

What would you expect to happen if you raised the temperature of the water to 85°C? Check all that apply.

Answers

Answer: it's a and D

Explanation:

Just answered it and got it right

I don't know your options but maybe this bit of information will help, the boiling point of water is 212°F so at that temperature it will likely just start evaporating

How do gases from the air help break down rocks?

Answers

Some rocks are sedimental. They are soft. Rocks are made out of gases etc. So some of the gas in the air makes a reaction with the rock which helps break the rock down.

Rocks are made up of different compounds. Gases like nitrogen, oxygen and water vapour and some non-metallic oxides react with these compounds to form new compounds and then break down into fine particles, due to breaking of bonds between the atoms, caused by the reaction of gases.This leads to break down of rocks into fine particles

Why is making a peanut pretzel and cereal mixture is chemical

Answers

It is actually a Physical Change because of the mixture in both of them your not combining them Hope This Helps:)

Jordan is doing a science fair project on the effect of music on the growth of tomatoes. He has two tomatoe plants,plant A and plant B, that he grows in a window and gives that same amount of water.plant A is exposed to classical music using headphones attached to the soil. Throughout the growth period, Jordan counts the number of tomatoes produced by each plant.What is the control group?
What is the independent variable?
What is the dependent variable?
What should jordan's conclusion be?
Jordan need to repeat this experiment, what should he do differently?

Answers

The control group is the type of tomato the plants are.
The independent variable is the type of music played.
The dependent variable is Plant A and B's growth.
His conclusion should be that music does not affect the growth of tomatoes.
He should make sure both plants were getting the same amount of water, soil, light, seed, and fertilizer so that can't affect the tomatoes in any way.

Final answer:

The control group in Jordan's experiment is Plant B; the independent variable is the exposure to classical music, and the dependent variable is the number of tomatoes. Jordan's conclusion should be based on comparative results, and for future experiments, he should increase the number of plants for a stronger and more valid conclusion.

Explanation:

In the context of Jordan's science fair project, the control group is the Plant B, which is grown under normal conditions without exposure to classical music.
The independent variable is the exposure to classical music which applies to Plant A, while the dependent variable is the number of tomatoes produced by each plant, as this is what Jordan is comparing between the two conditions.

Jordan's conclusion should be based on the comparative growth results between the two plants. If plant A (exposed to classical music) produces more tomatoes, he might conclude that classical music has a positive effect on the plants' growth. However, this experiment currently lacks repeatability and a larger sample size for stronger validation.

For future experiments, Jordan should aim to increase the number of plants in both experiment and control groups. This would help to control for natural variations and strengthen the conclusion drawn.

Learn more about Science Experiment Parameters here:

brainly.com/question/33509280

#SPJ11

When dissolved beryllium chloride reacts with dissolved silver nitrate in water, aqueous beryllium nitrate and silverchloride powder are made.

Answers

Answer:

The balanced chemical equation is :

$BeCl_(2) + 2AgNO_(3)\rightarrow Be(NO_(3))_(2) + 2AgCl$

Explanation:

The chemical equation in which number of atoms in reactants is equal to products is called balanced equation.

Formula of , Beryllium Chloride : $[BeCl_(2)$

Beryllium Nitrate : $BeNO_(3)$

Silver Chloride : $AgCl$

Silver Nitrate : $AgNO_(3)$

When beryllium chloride reacts with dissolved silver nitrate in water , following reaction occur :

$BeCl_(2) + 2AgNO_(3)\rightarrow Be(NO_(3))_(2) + 2AgCl$

The number of atoms in reactant as well as in products are balanced :

Be = 1

Ag = 2

N =2

O = 6

Cl = 2

Final answer:

This is a chemical reaction involving beryllium chloride and silver nitrate in water, resulting in the formation of solid silver chloride and aqueous beryllium nitrate.

Explanation:

The question pertains to a chemical reaction in aqueous solution between beryllium chloride and silver nitrate. This reaction can be described by the equation BeCl2(aq) + 2AgNO3(aq) → 2AgCl(s) + Be(NO3)2(aq). In this equation, (aq) represents compounds dissolved in water (aqueous), and (s) represents solid. This reaction results in a precipitate of silver chloride (AgCl(s)), which is a powder, and an aqueous solution of beryllium nitrate (Be(NO3)2a).