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Sever21 [200]
2 years ago
8

In an experiment trying to dissolve sugar in water, a person boils water in a pot on the stove and then puts the water and the s

ugar in a cup. That person times how long it takes to dissolve the sugar.
Chemistry
1 answer:
quester [9]2 years ago
5 0

Answer:

it take many long time but i dont know accurate time

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Why does water with salt in it freeze much more slower than water without it ? Explain
serg [7]
When you add salt to water, you lower to freezing point of the substance.

So for example, normal water freezes at 0°C. But water with salt in it won't freeze at 0°C, because its freezing point is lowered. 

In answer to the question. It takes longer for water with salt in it to freeze because the substance requires a lower temperature than normal water to freeze.
4 0
3 years ago
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Frank pulls down on a garage door with a force of 80 N. If the door weighs 210 N, what is the net downward force on the door?
elena-s [515]

Answer:

290 N

Explanation:

Total downward force = Force applied on the door in bringing it down + weight of the door

Total downward force = 80 + 210

Total downward force = 290N

7 0
3 years ago
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Dissolving 0.729 mol NaCl in 2530 mL of water yields a solution with what concentration?
Natasha_Volkova [10]

Dissolving 0.729 mol NaCl in 2530 mL of water yields a solution with 2.88M concentration.

Explanation:

The moles of NaCl given will be dissolved and volume will be made with given data will give molarity.

The units for molarity are moles/litre, so the volume given in ml will be converted to litres by dividing it with 1000.

data given:

number of moles of NaCl = 0.729 moles

volume of the solution = 2530 ml or 2.53 litre

To calculate the concentration of the solution the formula used is:

molarity = \frac{0.729}{2.530}

              = 0.288 M

The concentration or molarity of the solution OF NaCl  is 2.88M

5 0
2 years ago
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There are<br>main variables that every experiment should have<br>​
Alexandra [31]

Answer:

Experiments should have the independent variable, and a dependent variable, as well as a constant variable and control variables.

Explanation:

Constants

Experimental constants are values that do not change either during or between experiments. Many natural forces and properties, such as the speed of light and the atomic weight of gold, are experimental constants. In some cases, a property can be considered constant for the purposes of an experiment even though it technically could change under certain circumstances. The boiling point of water changes with altitude and acceleration due to gravity decreases with distance from the earth, but for experiments in one location these can also be considered constants.

Independent Variable

The independent variable in an experiment is the variable whose value the scientist systematically changes in order to see what effect the changes have. A well-designed experiment has only one independent variable in order to maintain a fair test. If the experimenter were to change two or more variables, it would be harder to explain what caused the changes in the experimental results. For example, someone trying to find how quickly water boils could alter the volume of water or the heating temperature, but not both.

Dependent Variable

A dependent variable is what the experimenter observes to find the effect of systematically varying the independent variable. While an experiment may have multiple dependent variables, it is often wisest to focus the experiment on one dependent variable so that the relationship between it and the independent variable can be clearly isolated. For example, an experiment could examine how much sugar can dissolve in a set volume of water at various temperatures. The experimenter systematically alters temperature (independent variable) to see its effect on the quantity of dissolved sugar (dependent variable).

Control

A controlled variable is a variable that could change, but that the experimenter intentionally keeps constant in order to more clearly isolate the relationship between the independent variable and the dependent variable. For example, an experiment examining the relationship between how much sunlight plants receive (independent variable) and how tall they grow (dependent variable) should make sure none of the other factors change. The experimenter should control how much water the plants receive and when, what type of soil they are planted in, and as many other variables as possible.

3 0
3 years ago
F. fluorite scratches limestone and gypsum
Alenkinab [10]

Answer:

f  i thnk

Explanation:

8 0
2 years ago
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