7 szkoły podstawowej

8 szkoły podstawowej

Chemia w zadaniach i przykładach. Zbiór zadań dla klas 7 i 8 szkoły podstawowej.

Chemia

Chemia 7

Chemia 7 i 8

Chemia Nowej Ery 7

Ciekawa chemia 7

Świat chemii 7

Dane:&nbsp; mr​=500g Cp​=1% Szukane:&nbsp;

Dane :&nbsp; mr​=200 kg &nbsp; Cp​=3,5% Szukane :&nbsp;

Dane: 3,5 kg - masa proszku 5% - ilość niejonowych środków powierzchniowo czynnych Szukane:

Dane: <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/c503144baad7b0f4dc5cb06f84bf65cf283e461af44af4e00816af5d8d33d9dc_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/c503144baad7b0f4dc5cb06f84bf65cf283e461af44af4e00816af5d8d33d9dc_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/fb1d674e0425c6c0618f3bf82d9800d77c9a161cb8e42318dec16bc39e659501_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/fb1d674e0425c6c0618f3bf82d9800d77c9a161cb8e42318dec16bc39e659501_big.svg" type="image/svg+xml"></object> &nbsp; Szukane: <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/22f7783f9801d7024e70c891fc63d6bd53c1c08a3162d15993ba961025fa911f_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/22f7783f9801d7024e70c891fc63d6bd53c1c08a3162d15993ba961025fa911f_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/72d0e41dc459bd12a20ee64eff45cd593064ffb1775cf3f7cf5b24bd4152c247_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/72d0e41dc459bd12a20ee64eff45cd593064ffb1775cf3f7cf5b24bd4152c247_big.svg" type="image/svg+xml"></object> &nbsp;Rozwiązanie: Korzystając z wzoru na obliczanie stężenia procentowego, po odpowiednich jego przekształceniach, wyznaczamy masę substancji: &nbsp; <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/6bfca71c252b49af584040bf1b7a3e5f8e680fa93338408f4ba89f3698679d3c_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/6bfca71c252b49af584040bf1b7a3e5f8e680fa93338408f4ba89f3698679d3c_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/d7e0b4a171d06623df124f073d527eb6332b042562d7802651a0e510b872558f_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/d7e0b4a171d06623df124f073d527eb6332b042562d7802651a0e510b872558f_big.svg" type="image/svg+xml"></object> &nbsp; <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/efd453516ad3c591e1a6a6b18ffdc621e5fd318bb55ce3425eb02f29806dabc6_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/efd453516ad3c591e1a6a6b18ffdc621e5fd318bb55ce3425eb02f29806dabc6_big.svg" type="image/svg+xml"></object> &nbsp;&nbsp; <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/239ab24818bdf2d802e323f2178d3e480d2d53d02e5f4d835d657d8d372d81e9_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/239ab24818bdf2d802e323f2178d3e480d2d53d02e5f4d835d657d8d372d81e9_big.svg" type="image/svg+xml"></object> &nbsp;&nbsp; Masa substancji wynosi 30g. Znając masę roztworu i masę substancji, możemy wyznaczyć masę rozpuszczalnika (wody): <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/4f3c66bc9d73f7d98d2671814f1263a3e03f6ebb90370679c67ffd66ac359088_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/4f3c66bc9d73f7d98d2671814f1263a3e03f6ebb90370679c67ffd66ac359088_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/2825e9ef291a1d653636f221ac7485a37e45a6e03958078187c6df20c5627e40_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/2825e9ef291a1d653636f221ac7485a37e45a6e03958078187c6df20c5627e40_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/2fd1d9dfe41f62779d29b2bf5793ab23d340bac3a5e2511bb486c3b812394793_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/2fd1d9dfe41f62779d29b2bf5793ab23d340bac3a5e2511bb486c3b812394793_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/efdff7a4fa25651a3b0941e5f554827739fb8727098192e51127ccc259fd3abb_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/efdff7a4fa25651a3b0941e5f554827739fb8727098192e51127ccc259fd3abb_big.svg" type="image/svg+xml"></object> Odpowiedź:&nbsp;Należy użyć 30 g soli kuchennej i 170g wody.

Dane:&nbsp; <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/cf6628801a24c0355ac37d2c175b4fd05c590e4f909153dc5e5129fb4b8951bb_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/cf6628801a24c0355ac37d2c175b4fd05c590e4f909153dc5e5129fb4b8951bb_big.svg" type="image/svg+xml"></object> <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/8996e5d00b1eb008108afdd1e3146b7c3d4f6d78935f759f3d6d99d1f32fdd9b_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/8996e5d00b1eb008108afdd1e3146b7c3d4f6d78935f759f3d6d99d1f32fdd9b_big.svg" type="image/svg+xml"></object> Szukane:&nbsp;

Dane :&nbsp; <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/7551e12a3e4c95659a2e70158050fb84a3d28ab5cd57af3d9e5dd0bfc44138a4_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/7551e12a3e4c95659a2e70158050fb84a3d28ab5cd57af3d9e5dd0bfc44138a4_big.svg" type="image/svg+xml"></object> &nbsp; <object class="math small" data="https://odrabiamy.pl/api/v3/math_formulas/ccc0ef86de94ce3447a886f6e57180eee5841b40f026ded9dd070820a8348a48_small.svg" type="image/svg+xml"></object><object class="math big" data="https://odrabiamy.pl/api/v3/math_formulas/ccc0ef86de94ce3447a886f6e57180eee5841b40f026ded9dd070820a8348a48_big.svg" type="image/svg+xml"></object> Szukane :&nbsp;

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